67 results on '"Duong Quoc Hung"'
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2. Reducing voltage fluctuations using DSTATCOMs and reactive power of PV inverters in a medium voltage distribution system
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Duong Quoc Hung, Yateendra Mishra, and Geoffrey Walker
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voltage control ,invertors ,static var compensators ,reactive power control ,photovoltaic power systems ,power distribution control ,compensation ,load flow ,voltage measurement ,power measurement ,controllability ,power generation control ,pv inverters ,medium voltage distribution system ,local reactive power control ,medium-voltage systems ,photovoltaic inverters ,nodal power injections ,voltage controllability ,multiple reactive power resources ,voltage fluctuation reduction ,dstatcom ,line segment power-flow variable transformation ,solar power measurement ,reactive power compensation estimation ,voltage controllability enhancement ,coordinated control ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
This paper proposes local reactive power control to mitigate the voltage fluctuation in medium-voltage systems using DSTATCOMs and photovoltaic (PV) inverters. New expressions are developed to estimate voltage fluctuations and reactive power compensations by transforming line segment power-flow variables into nodal power injections. Using local measurements of voltages and solar powers, the method can provide a fast estimation of reactive power compensations to maintain the voltage at every bus. DSTATCOMs are also properly allocated to enhance the voltage controllability. Coordinated control of multiple reactive power resources is investigated as well. One-second solar irradiance along with one-minute home loads is used to demonstrate the effectiveness of the proposed method.
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- 2019
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3. Distribution and structural-functional attributions of Erythrophleum fordii Oliver in Bac Giang Province, Vietnam.
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Duong Thi Thanh, Zhang Ying, Nguyen Chi Thanh, Duong Quoc Hung, and Do Thi Thao
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ERYTHROPHLEUM ,FORESTS & forestry ,MOUNTAIN soils ,SPECIES diversity - Abstract
The research was conducted in 2022 in areas where Erythrophleum fordii Oliver naturally grows in Bac Giang Province, Vietnam. The objective was to determine the distribution and silvicultural attributes of E. fordii, including its structural features and regeneration. The study results identified that E. fordii is naturally distributed in five districts of Bac Giang Province: Luc Nam, Luc Ngan, Yen The, Son Dong, and Tan Yen. E. fordii is widely distributed at altitudes ranging from 50 to 500 m, with a prominent presence between 100 and 200 m above sea level. As the altitude increases, the occurrence of E. fordii decreases. The forest areas dominated by E. fordii exhibit rich biodiversity, particularly in primary evergreen broadleaved forests on mountain soils, with a total of 71 species. The number of species contributing to the forest structure ranges from 9 to 15, depending on the forest condition. The study also revealed that E. fordii has a high composition coefficient, followed by Burseraceae, Chestnut, Jambolan, Elaeocarpus, Engelhardtia chrysolepis Hance, among others. The natural regeneration of E. fordii is low, with an average density of 680 trees per ha and 8 trees per route. However, the regeneration quality is poor. The dominance of regenerated trees varies significantly with altitude, decreasing as the altitude elevates. [ABSTRACT FROM AUTHOR]
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- 2023
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4. Load levelling and loss reduction by ES in a primary distribution system with PV units.
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Junainah Sardi, Nadarajah Mithulananthan, Duong Quoc Hung, and Krischonme Bhumkittipich
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- 2015
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5. Geomorphological characteristics of the Southwest waters of Vietnam
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Le, Dinh Nam, primary, Vu, Van Phai, additional, Do, Huy Cuong, additional, Tran, Anh Tuan, additional, Duong, Quoc Hung, additional, Phan, Dong Pha, additional, Vu, Le Phuong, additional, Tran, Xuan Loi, additional, and Tran, Hoang Yen, additional
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- 2022
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6. Begonia yentuensis and B. khaucaensis (Begoniaceae), two new species from northern Vietnam
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LUU, HONG TRUONG, primary, DUONG, QUOC HUNG, additional, LE, KHAC QUYET, additional, and LIN, CHE-WEI, additional
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- 2022
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7. Begonia yentuensis and B. khaucaensis (Begoniaceae), two new species from northern Vietnam
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Luu, Hong Truong, Duong, Quoc Hung, Le, Khac Quyet, and Lin, Che-Wei
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Tracheophyta ,Magnoliopsida ,Cucurbitales ,Begoniaceae ,Biodiversity ,Plantae ,Taxonomy - Abstract
Luu, Hong Truong, Duong, Quoc Hung, Le, Khac Quyet, Lin, Che-Wei (2022): Begonia yentuensis and B. khaucaensis (Begoniaceae), two new species from northern Vietnam. Phytotaxa 560 (2): 222-232, DOI: 10.11646/phytotaxa.560.2.5, URL: http://dx.doi.org/10.11646/phytotaxa.560.2.5
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- 2022
8. Begonia yentuensis Luu & C. W. Lin. A. Habit 2022, sp. nov
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Luu, Hong Truong, Duong, Quoc Hung, Le, Khac Quyet, and Lin, Che-Wei
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Tracheophyta ,Magnoliopsida ,Begonia ,Cucurbitales ,Begoniaceae ,Biodiversity ,Plantae ,Begonia yentuensis ,Taxonomy - Abstract
Begonia yentuensis Luu & C.W. Lin, sp. nov. (Figs. 1 & 2) Type: — VIETNAM. Bac Giang Province: Yen Tu Mountain Range, Tay Yen Tu Nature Reserve, N21°09’58” E106°46’34”, 498 m elev., 09 August 2013, Luu Hong Truong, Hoang Minh Duc, Le Khac Quyet & Duong Quoc Hung TYT22 (holotype: SGN; isotypes: SGN, PHH & TAIF). Monoecious tuberous herb. Stem tuberous at base, tubers globose up to ca. 3 cm with numerous fibrous roots, stemless or sometimes producing leafless erect stem to 3 cm long, ca. 5 mm across, crimson, glabrous. Stipules yellowish pink to red, very widely triangular, 2–3 mm long, 4–6 mm wide, herbaceous, abaxially strongly aristate-keeled near tip of the midrib up to 8 mm long, margin ciliate; stipules at erect stem red, triangular, ca. 3–4 × 3 mm, herbaceous, slightly keeled, glabrous, margin entire to ciliate, apex acute and mucronate. Leaves solitary, nearly appressed to substrate; petiole terete, yellowish pink, 1–7 cm long, 3–6 mm across, adaxially densely hirsute, subglabrous abaxially; leaf blades symmetric or subsymmetric, very widely ovate to orbicular, undivided or with irregular pointed shallowly lobes ca. 3–10 mm long, blade 9–23 cm long, 8.2–24 cm wide, basal lobes cordate, 1.5–5 cm long, apex acute, margin biserrate and ciliate; leaf thick chartaceous, succulent, adaxially olive green to dusky green, slightly bullate and puberulous between veins, giving lamina a wrinkled texture; abaxially magenta to brownish red, puberulous and hirsute on veins; venation palmate, midrib distinguishable, 6–18 cm long, ca. 2 major lateral veins on either side of midrib, other primary veins branching dichotomously, tertiary veins reticulate. Inflorescences terminal on erect stem or arising directly from tuber, bisexual, cymosely branching panicle 7–25 cm long, peduncle 4–12.5 cm long, branched 3–5 times, erect, red, glabrous; protandrous. Bracts deciduous, red, ovate-triangular to ovate, first pair 7–10 × 5–7 mm, glabrous, margin ciliate, bracts of upper inflorescence similar but smaller. Staminate flower: pedicel creamy pink to red, 1.3–2 cm long, glabrous, tepals 4, white to pink, glabrous; outer 2, orbicular to widely ovate, 11−13 mm across; inner 2, obovate, 9–12 mm long, 5–6.5 mm wide, apex rounded; androecium zygomorphic, ca. 3.5 mm across; stamens yellow, 17–25; filaments shortly fused at base; anthers oblong, ca. 1 mm long, 2-locular, apex rounded, filaments ca. 1 mm long. Pistillate flower: pedicel red, 0.7–2.5 cm long, glabrous, ovary pale creamy green, trigonous-ellipsoid, 8–10 mm long, ca. 5 mm thick (wings excluded), glabrous; 3-winged, wings unequal, triangular, 11–13 mm long, glabrous; lateral wings narrower, 2–4 mm wide, abaxial wing 5–7 mm wide, margin entire; ovary 3-locular, placenta undivided; tepals 5 (rarely 4), white to pink, glabrous, outer 2, orbicular, 8–12 mm across; inner 3, suborbicular to obovate, 6–11 mm long, 5–10 mm wide, apex rounded; styles 3, fused at base, yellow, 2–3 mm long, stigma spirally twisted. Capsule capsule body ca. 15 mm long, 7.5 mm across, glabrous; wings 3, unequal, 16–18 mm long, lateral wings to 5 mm wide, abaxial wing to 13 mm wide, rounded to truncate proximally, truncate distally, splitting between the locules and wings. Distribution and ecology:— Begonia yentuensis is endemic to Bac Giang Province, North Vietnam. It is a deciduous lithophyte growing on sandstone rock under the canopy of a secondary moist tropical evergreen forest dominated by species of the Magnoliaceae, Fagaceae and Lauraceae mixed with bamboos. Phenology:— Flowering was found in July to September and fruiting starting in August. Etymology:— The species is named after its type locality, Yen Tu Mountain Range. Conservation status:— Begonia yentuensis was found in western slopes of the Yen Tu Mountain Range and appears to be rare within Tay Yen Tu Nature Reserve and fewer than 100 mature individuals. It may be found in adjacent forests of the Yen Tu Mountain Range. Therefore, we provisionally propose its conservation status as Data Deficient until more information is recorded (IUCN Standards and Petitions Subcommittee, 2022). Notes:— Begonia yentuensis resembles B. asperifolia Irmsch. (1927: 359) (Fig. 3) in its winter dormant habit, subsymmetric, rugose foliage, 4-tepaled staminate flowers and pistillate flowers with 5 tepals, but it is different in its shorter petioles up to 7 (vs. to 28) cm long, androecium golfclub-shaped (vs. spherical), filaments fused at base (vs. fused at base into a column ca. 2 mm long), anthers less than 25 (vs. more than 50), apex rounded (vs. acute to mucronate) and placentae unilamellate (vs. bilamellate). Like B. asperifolia, according to phenotypic morphology and geographical origin, B. yentuensis is best placed within the group known as “unassigned to section with tubers” that belongs to Begonia subg. Platycentrum in Shui’s system. Molecular studies are necessary to confirm if there are trait combinations or new morphological traits suitable for creating a new section, or assigning the species to a known section. In the subsymmetric, solitary leaf and terminal inflorescence, B. yentuensis is also similar to B. labordei H. Léveillé (1904: 323) (Fig. 4), but differs in the rugose (vs. flat) foliage, cymose inflorescence (vs. racemose at base), pistillate tepals 4 or 5 (vs. 3 or 4) and actinomorphic (vs. zygomorphic), ovary glabrous (vs. often hairy) and placentae unilamellate (vs. bilamellate). A comparison of the salient characters of the three species is presented in Table 1.
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- 2022
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9. Begonia khaucaensis Luu & C. W. Lin. A, B. Habit 2022, sp. nov
- Author
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Luu, Hong Truong, Duong, Quoc Hung, Le, Khac Quyet, and Lin, Che-Wei
- Subjects
Tracheophyta ,Magnoliopsida ,Begonia ,Begonia khaucaensis ,Cucurbitales ,Begoniaceae ,Biodiversity ,Plantae ,Taxonomy - Abstract
Begonia khaucaensis Luu & C.W.Lin, sp. nov. (Figs. 5 & 6) Type:— VIETNAM. Ha Giang Province: Dong Van Karst Plateau - Du Gia National Park, Khau Ca Forest, 22°50’54”N 105°7’16”E, 800m elev., 22 October 2016, Luu Hong Truong & Le Khac Quyet HG 6 (holotype: SGN; isotypes: SGN, PHH & TAIF). Monoecious rhizomatous herb. Rhizome stout, creeping, crimson, ca. 1 cm thick, internodes 0.5–3 cm long, hirsute. Stipules crimson to reddish olive green, widely triangular, 1.5–2.5 cm long, 1.2–2.3 cm wide, herbaceous, keeled, abaxial midrib scattered with white hirsute, margin entire, apex aristate, arista ca. 3 mm long. Leaves alternate, petiole terete, crimson to dark brownish red, 18–30 cm long, 0.5–1 cm thick, lenticels slightly prominent, creamy white, sparsely to densely hirsute, glabrescent; leaf blade asymmetric, suborbicular to reniform, oblique, with a welldeveloped basal lobe on one side giving a cordate appearance, 17.5−27 cm long, 15–23 cm wide, broad side 9.5–16 cm wide, basal lobes cordate, 5–11 cm long, margin sparsely denticulate to subentire, apex acuminate; leaf thin coriaceous, succulent, adaxially emerald green (vermilion to greenish maroon when juvenile), sparsely bullate between veins, bulla tipped white hirsute, glabrescent; abaxially pale green, veins pale red; venation basally 7–9 palmate, midrib distinct, ca. 2 secondary veins on each side, lateral through connection between with other basal veins, minor veins reticulate. Inflorescences axillary, dichasial cymes, arising directly from rhizome, branched up to 5 times; bisexual, cymosely branching panicle 16–30 cm long, peduncle olive green to crimson, 13–25 cm long, glabrous. Bracts white to rosy red, orbicular to very widely ovate, first pair up to 2.5 cm across, glabrous, margin entire, apex retuse to rounded or apiculate; bracts of upper inflorescence similar but smaller. Staminate flower: pedicel white to pink, 0.8–2 cm long, glabrous; tepals 4, white to rosy pink, glabrous; outer 2, very widely obovate to orbicular, 12–15 mm long, 13–16 mm wide; inner 2, elliptic, ca. 7 mm long, 3 mm wide; androecium zygomorphic, ca. 5 mm across; stamens golden yellow, 40–65, filaments fused at base, anthers narrowly obovate-triangular, ca. 1.5 mm long, 2-locular, apex truncate to slightly retuse, shorter than filaments. Pistillate flower: pedicel pinkish white to rosy pink, 1.7–2 cm long, glabrous; tepals 3, rosy pink to white, glabrous; outer 2, orbicular to widely depressed ovate, 9–14 mm long, 8–15 mm wide; inner 1, elliptic, 5–8 mm long, 2–3 mm wide; ovary narrowly trigonous-ellipsoid, 6–8 mm long, ca. 3 mm thick (wings excluded), pink to white, 3-winged; wings unequal, pinkish white, 8–10 mm long, lateral wings narrower, narrowly crescent-shaped, 1.5–2.5 mm wide, abaxial wing crescent-shaped, ca. 4 mm wide, margin entire; ovary 3-locular, placenta bilamellate; styles 3, fused at base, golden yellow, ca. 3.5 mm long, stigma spirally twisted. Capsule pendent on a stalk 28–37 mm long, tepals persistent, capsule ca. 15 mm long, 1 cm thick (wings included), wings unequal, crescent-shaped, rounded to cuneate proximally, rounded distally. Distribution and ecology:— Endemic to Du Gia National Park in Ha Giang Province. The new species is an evergreen lithophyte growing on damp limestone rock under the canopy of tropical evergreen forests dominated by Burretiodendron hsienmu W.Y.Chun & F.C.How (Malvaceae) and species of the Clusiaceae, Sapindaceae, Ebenaceae, Euphorbiaceae, Aceraceae, Araliaceae and Fagaceae. Phenology:— Flowering was seen in October and November, and fruiting starting in November. Etymology:— The species is named after its type locality, Khau Ca Forest. Conservation status:— Least Concern (LC) (IUCN Standards and Petitions Subcommittee, 2022). Begonia khaucaensis appears to be abundant and well protected within the Khau Ca Forest of Dong Van Karst Plateau - Du Gia National Park. No threats to its existence were seen. Notes:— B. khaucaensis is restricted to limestone regions, and it has characters such as rhizomatous habit, axillary inflorescence and 3-tepaled pistillate flowers. These characters are shared by sect. Coelocentrum, however, it is also similar with the broad delimitation of sect. Petermannia in Shui’s system (2019) in many aspects. We are unable to appropriately allocate this new species to any section until molecular information is available. Begonia khaucaensis somewhat resembles B. jubar V.T.Pham & C.W. Lin (2021: 145) in its rhizomatous habit, 4-tepaled staminate flowers and 3-tepaled pistillate flowers with 3-locular ovaries with blamellate placentae, but it is different from B. jubar in its hairy stipules (vs. glabrous), sparsely to densely hirsute petioles (vs. glabrous), suborbicular to reniform leaves (vs. ovate to widely ovate with slightly polygonal outline), entire bract margins (vs. denticulate to serrate with very short soft hairs), zygomorphic androecium (vs. actinomorphic or nearly so) and crescent-shaped ovary wings (vs. triangular). Moreover, B. khaucaensis bears some resemblance to B. quadripetiolata Aver. & H.Q.Nguyen (2019: 135) in the rhizomatous habit, uniformly green leaves, 4-tepaled staminate flowers and the bilamellate placentae, however, the new species markedly differs in the petioles have a terete outline (vs. quadrate), leaf upperside very sparsely hirsute hairs (vs. glabrous), zygomorphic (vs. actinomorphic) androecium and 3-tepaled (vs. 5-tepaled) pistillate flowers. A detailed comparison of B. khaucaensis with these two phenetically similar species are presented in Table 2., Published as part of Luu, Hong Truong, Duong, Quoc Hung, Le, Khac Quyet & Lin, Che-Wei, 2022, Begonia yentuensis and B. khaucaensis (Begoniaceae), two new species from northern Vietnam, pp. 222-232 in Phytotaxa 560 (2) on pages 227-230, DOI: 10.11646/phytotaxa.560.2.5, http://zenodo.org/record/7040690, {"references":["Lin, C. W., Phan, L. C. S. & Nguyen, N. H. (2021) Begonia rigidifolia ssp. sonhungii (sect. Petermannia, Begoniaceae), a new subspecies from limestone hills in Central Vietnam. Phytotaxa 498 (2): 139 - 144. https: // doi. org / 10.11646 / phytotaxa. 498.2.7"]}
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- 2022
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10. Multiple Distributed Generator Placement in Primary Distribution Networks for Loss Reduction.
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Duong Quoc Hung and Nadarajah Mithulananthan
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- 2013
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11. ĐẶC ĐIỂM HỆ THỐNG SÔNG CỔ VÀ TÁC ĐỘNG NHÂN SINH DỰA TRÊN KẾT QUẢ MÔ HÌNH TIẾN HÓA TỈ LỆ LỚN KHU VỰC CHÂU THỔ SÔNG HỒNG
- Author
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Nguyen Trung Thanh, Mai Duc Dong, Pham Quoc Hiep, Duong Quoc Hung, Renat Shakirov, Phung Van Phach, and Nguyen Van Diep
- Abstract
The Simclast model has been verified and applied effectively in simulating the delta development for some major deltas in the world. In this study, we applied the model Simclast for simulating the history of the Red river delta development in late Pleistocene-Holocene. Results of the model reveal that the mainland of study area had reduced rapidly during transgression period (10,000-8,000 BP). The morphology changed significantly in the paleo-Red and Day river systems, but slightly in the paleo Thai Binh river system. The paleo-river network had been active in upper part before 11,000 BP and then shifted seaward until 2,000 BP. The river-sea interaction causes erosion and accumulation; as a result the morphology changed remarkably. The paleo-Thai Binh river had been inactive until 5,500 BP and then it was active but the morphology had not varied remarkably. The recent coastline generated from Simclast is relatively in accordance with the present coastline.
- Published
- 2020
12. Recent geodynamic characteristics of the Southern Central coast and the relations with geological hazards
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Bui Nhi Thanh, Mai Duc Dong, Nguyen Van Luong, Duong Quoc Hung, and Nguyen Van Diep
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Southern central ,Earth science ,Geologic hazards ,Geology - Abstract
Recent geodynamic characteristics of the Southern Central coast are analyzed on the basis of vertical and horizontal displacement velocities along active fault zones. The horizontal displacement velocity varies in magnitude from this fault system to another fault system, from 0.11–0.3 mm/year on the strike-slip - normal faults to 0–0.058 mm/year on the strike-slip faults and normal faults. The subsidence velocity changes complicatedly, different from one fault to another fault, depending on the mechanism of faults. On the continental shelf, most of the values of high subsidence’s velocity are related to the normal and strike-slip faults. Subsidence activities make the sea level increase highly, the subsidence activity makes the sea level rise at structures that fall close to the shore, reach about 0.2–0.48 mm/year in late Pleistocene - Holocene. The increase of sea level directly affects the intensity of erosion, flood, salinity and land loss events in coastal lowlands. Slippage of the seabed, earthquakes, volcanoes are geological hazards directly related to the geodynamic regime of the Southern Central coast.
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- 2019
13. A study on the relationship between gas-geochemical field and tectonic fault activities in the rivermouth area of northwestern Gulf of Tonkin
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Iosif Iugai, Duong Quoc Hung, Le Duc Anh, Bui Van Nam, Nguyen Van Diep, Yury Telegin, Mai Duc Dong, and Renat Shakirov
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Tectonics ,geography ,Paleontology ,geography.geographical_feature_category ,Field (physics) ,Fault (geology) ,Geology - Abstract
The article mentions the results of the new analysis of gas-geochemical and high resolution shallow seismic data acquired by the sea surveys in 2016, which revealed a remarkable coincidence between the seabed gas anomalies at river mouth area of Gulf of Tonkin and the gas distortion/accumulation phenomena in the near-surface sediment layers, especially right above the large tectonic fault systems, such as Red river, Lo river and Chay river. The gas-geochemical analysis reveals the existences of thermogenic and metamorphic methane and carbon dioxide gases within the faults of Red river and on Cat Ba island, anomalies of helium and hydrogen as well as the “heavy” isotopic carbon signals of methane and carbon dioxide in the areas of near-surface active faults. These new results suggest the initial conclusions about the relationship between gas-geochemical field and tectonic fault activities in study area.
- Published
- 2019
14. A Hybrid Multi-answer Summarization Model for the Biomedical Question-Answering System
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Nguyen, Quoc-An, primary, Duong, Quoc-Hung, additional, Nguyen, Minh-Quang, additional, Nguyen, Huy-Son, additional, Le, Hoang-Quynh, additional, Can, Duy-Cat, additional, Thanh, Tam Doan, additional, and Tran, Mai-Vu, additional
- Published
- 2021
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15. Voltage fluctuation mitigation: fast allocation and daily local control of DSTATCOMs to increase solar energy harvest
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Duong Quoc Hung and Yateendra Mishra
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Renewable Energy, Sustainability and the Environment ,business.industry ,020209 energy ,020208 electrical & electronic engineering ,Photovoltaic system ,02 engineering and technology ,AC power ,Solar energy ,Compensation (engineering) ,Controllability ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,Environmental science ,business ,Energy harvesting ,Solar power ,Voltage - Abstract
This study presents a methodology for reactive power compensation provided by distribution static synchronous compensators (DSTATCOMs) to mitigate the voltage fluctuation and increase the solar energy harvest via photovoltaic (PV) inverters accordingly in medium-voltage distribution systems. An approximate method that uses one power flow run with the base-case system is analytically developed to offer a fast estimation of the location and size of DSTATCOMs to enhance the local voltage controllability over sunshine hours. This study then presents daily local reactive power control, where the control signals are calculated based on instantaneous measurements of the voltage at each bus without requiring any communications. The control method involves estimating the amount of reactive power support by the installed DSTATCOMs to reduce the voltage fluctuation during daytime while PV inverters are fully used to harvest the solar energy. At night-time, the DSTATCOMs operate as a master in voltage-controlled mode with other PV inverters in load mode if required to minimise the energy loss while improving the voltage profile. The proposed method has been tested on a 69-bus distribution system with 1 min load and 1 s solar power profiles and validated using a repeated power flow-based exact solution.
- Published
- 2019
16. Reducing voltage fluctuations using DSTATCOMs and reactive power of PV inverters in a medium voltage distribution system
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Yateendra Mishra, Duong Quoc Hung, and Geoffrey R. Walker
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dstatcom ,power generation control ,photovoltaic inverters ,Computer science ,power distribution control ,020209 energy ,power measurement ,Energy Engineering and Power Technology ,invertors ,Hardware_PERFORMANCEANDRELIABILITY ,02 engineering and technology ,nodal power injections ,Solar irradiance ,controllability ,Compensation (engineering) ,compensation ,reactive power control ,pv inverters ,Control theory ,voltage controllability enhancement ,0202 electrical engineering, electronic engineering, information engineering ,static var compensators ,voltage controllability ,coordinated control ,local reactive power control ,voltage fluctuation reduction ,photovoltaic power systems ,voltage control ,020208 electrical & electronic engineering ,Photovoltaic system ,General Engineering ,medium-voltage systems ,AC power ,Power (physics) ,Controllability ,multiple reactive power resources ,lcsh:TA1-2040 ,voltage measurement ,Reactive power control ,load flow ,solar power measurement ,reactive power compensation estimation ,lcsh:Engineering (General). Civil engineering (General) ,line segment power-flow variable transformation ,Software ,medium voltage distribution system ,Voltage - Abstract
This paper proposes local reactive power control to mitigate the voltage fluctuation in medium-voltage systems using DSTATCOMs and photovoltaic (PV) inverters. New expressions are developed to estimate voltage fluctuations and reactive power compensations by transforming line segment power-flow variables into nodal power injections. Using local measurements of voltages and solar powers, the method can provide a fast estimation of reactive power compensations to maintain the voltage at every bus. DSTATCOMs are also properly allocated to enhance the voltage controllability. Coordinated control of multiple reactive power resources is investigated as well. One-second solar irradiance along with one-minute home loads is used to demonstrate the effectiveness of the proposed method.
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- 2019
17. Features of the Distribution of Abnormal Gasgeochemical Fields in the Red River Rift (Gulf of Tonkin, South China Sea)
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Anatoly Obzhirov, M. S. Bakunina, Renat Shakirov, A. A. Legkodimov, O. V. Borzova, Mai Duc Dong, A. L. Ponomareva, Bui Van Nam, M. V. Shakirova, Duong Quoc Hung, Nguyen Van Diep, Le Duc Anh, A. K. Okulov, and N. S. Syrbu
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Multidisciplinary ,South china ,Rift ,010504 meteorology & atmospheric sciences ,business.industry ,Marine geology ,Distribution (economics) ,010502 geochemistry & geophysics ,01 natural sciences ,Tectonics ,Oceanography ,Lithosphere ,Earth and Planetary Sciences (miscellaneous) ,General Earth and Planetary Sciences ,Rift zone ,Far East ,business ,Geology ,0105 earth and related environmental sciences - Abstract
This paper reports the results of the third Russian–Vietnamese expedition (V.I. Il'ichev Pacific Oceanological Institute, Far East Branch, Russian Academy of Sciences and the Institute of Marine Geology and Geophysics, Vietnam Academy of Science and Technology) in the Gulf of Tonkin, South China Sea (April 2016). The studies revealed new specific features of the distribution and origin of gasgeochemical fields in sediments within the rift zone of the Red River along a 150-km profile. Four zones with high-amplitude anomalies of hydrocarbon gases, helium, hydrogen, carbon dioxide, and carbon monoxide were revealed. The distribution of the anomalies reflects the tectonic structure of the area and points to the presence of several lithospheric sources of gases including gases of deep origin. The studies were carried out within the scope of the Joint Vietnamese–Russian Laboratory for Marine Geoscience (V.I. Il'ichev Pacific Oceanological Institute, Far East Branch, Russian Academy of Sciences and the Institute of Marine Geology and Geophysics, Vietnam Academy of Science and Technology).
- Published
- 2019
18. Coordinated EV charging for correlated EV and grid loads and PV output using a novel, correlated, probabilistic model
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Duong Quoc Hung, Shariful Islam, and Nadarajah Mithulananthan
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Computer science ,020209 energy ,Quality of service ,020208 electrical & electronic engineering ,Photovoltaic system ,Probabilistic logic ,Energy Engineering and Power Technology ,Statistical model ,02 engineering and technology ,Grid ,Automotive engineering ,Power (physics) ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,Random variable ,Voltage - Abstract
Conventional deterministic electric vehicles (EV) charging coordination is performed assuming the EV and grid loads and PV output are known advance. In contrast, conventional probabilistic EV charging coordination takes into account the uncertainties of EV and grid loads and PV output without considering their mutual correlations. The major drawbacks of these methods are that the conventional deterministic charging increases the probability of voltage and current noncompliance (PVCN), while the conventional probabilistic charging decreases the quality of service (QoS). Therefore, this paper proposes a novel correlated probabilistic model for EV charging loads in coordination with a solar photovoltaic (PV)-rich commercial grid. In this model, correlated samples are generated from uncorrelated samples, which contain various random variables associated with EVs, battery energy storage (BES) and PV. The generated samples are subsequently incorporated in the proposed coordinated EV charging method, where the power factors of BES and PV are also controlled, to maximize QoS while minimizing PVCN. The effectiveness and practicability of the developed model are validated on an IEEE 37-bus unbalanced distribution system, which is associated with the real data of vehicles and solar PV collected from a campus of the University of Queensland.
- Published
- 2019
19. Analytical expressions for DG allocation in primary distribution networks
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Duong Quoc Hung, Mithulananthan, N., and Bansal, R.C.
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Electric power distribution -- Methods ,Electric power systems -- Electric losses ,Electric power systems -- Analysis ,Business ,Electronics ,Electronics and electrical industries - Published
- 2010
20. UETrice at MEDIQA 2021: A Prosper-thy-neighbour Extractive Multi-document Summarization Model
- Author
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Can, Duy-Cat, primary, Nguyen, Quoc-An, additional, Duong, Quoc-Hung, additional, Nguyen, Minh-Quang, additional, Nguyen, Huy-Son, additional, Ngoc, Linh Nguyen Tran, additional, Ha, Quang-Thuy, additional, and Tran, Mai-Vu, additional
- Published
- 2021
- Full Text
- View/download PDF
21. UETfishes at MEDIQA 2021: Standing-on-the-Shoulders-of-Giants Model for Abstractive Multi-answer Summarization
- Author
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Le, Hoang-Quynh, primary, Nguyen, Quoc-An, additional, Duong, Quoc-Hung, additional, Nguyen, Minh-Quang, additional, Nguyen, Huy-Son, additional, Thanh, Tam Doan, additional, Vuong, Hai-Yen Thi, additional, and Nguyen, Trang M., additional
- Published
- 2021
- Full Text
- View/download PDF
22. Studying and forecasting the evolution of the Day river coastal zone up to the year of 2070
- Author
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Vu Hai Dang, Phan Dong Pha, Nguyen Thai Son, Duong Quoc Hung, Nguyen Thi Anh Nguyet, and Ngo Bich Huong
- Subjects
Oceanography ,Coastal zone ,Geology - Abstract
The Day river coastal zone is the place of plentiful and eventful economical activities and the natural habitat of diverse endemic species that should be preserved and developed. According to the updated geological, remote-sensing and oceanographic data sources, this study figures out the actual state, evolutional history and forecasts the development of the Day river coastal zone up to the year 2070, which could be used to improve the effectiveness of the long-term spatial coastal zone management and master planning. Major conclusions are as follows: (i) The Day river coastline has been highly modified since the last 50 years, (ii) The shoreline seaward development tends to gradually decrease in recent years, and (iii) The river-bed continues to be shifted southwestwards in the context of global climate change and sea level rise.
- Published
- 2020
23. ESTABLISHING THE SCHEME OF THE FAULTS IN SOUTH CENTRAL COASTAL REGION ON THE BASIS OF INTERPRETING THE GEOLOGICAL-GEOPHYSICAL DATA
- Author
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Duong Quoc Hung, Bui Nhi Thanh, Nguyen Kim Thanh, Mai Duc Dong, Nguyen Van Diep, Bui Thị Thanh Xuan, and Nguyen Van Luong
- Subjects
Scheme (programming language) ,Basis (linear algebra) ,Geophysics ,computer ,Geology ,computer.programming_language - Abstract
The scheme of the faults in South Central coastal region was established on the basis of interpreting the high resolution shallow seismic data and the deep-seismic data, in combination with the previous studies on geodynamics, tectonic evolution, geological hazards of the South Central coastal region. The fault systems were formed based on updated geophysical, geomorphological, tectonophysic and remote sensing data, including 19 faults in 3 directions: Sub-longitudinal (8 faults), NE-SW (7 faults) and NW-SE (4 faults).
- Published
- 2018
24. Late Pleistocene-Holocene sequence stratigraphy of the subaqueous Red River delta and the adjacent shelf
- Author
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Paul Liu, Do Huy Cuong, Phung Van Phach, Dang Hoai Nhon, Bui Viet Dung, Duong Quoc Hung, Mai Duc Dong, Ngo Thanh Nga, Nguyen Trung Thanh, and Tran Duc Thanh
- Subjects
010506 paleontology ,Paleontology ,geography ,River delta ,geography.geographical_feature_category ,Pleistocene ,General Earth and Planetary Sciences ,Sequence stratigraphy ,010502 geochemistry & geophysics ,01 natural sciences ,Holocene ,Geology ,0105 earth and related environmental sciences - Abstract
The model of Late Pleistocene-Holocene sequence stratigraphy of the subaqueous Red River delta and the adjacent shelf is proposed by interpretation of high-resolution seismic documents and comparison with previous research results on Holocene sedimentary evolution on the delta plain. Four units (U1, U2, U3, and U4) and four sequence stratigraphic surfaces (SB1, TS, TRS and MFS) were determined. The formation of these units and surfaces is related to the global sea-level change in Late Pleistocene-Holocene. SB1, defined as the sequence boundary, was generated by subaerial processes during the Late Pleistocene regression and could be remolded partially or significantly by transgressive ravinement processes subsequently. The basal unit U1 (fluvial formations) within incised valleys is arranged into the lowstand systems tract (LST) formed in the early slow sea-level rise ~19-14.5 cal.kyr BP, the U2 unit is arranged into the early transgressive systems tract (E-TST) deposited mainly within incised-valleys under the tide-influenced river to estuarine conditions in the rapid sea-level rise ~14.5-9 cal.kyr BP, the U3 unit is arranged into the late transgressive systems tract (L-TST) deposited widely on the continental shelf in the fully marine condition during the late sea-level rise ~9-7 cal.kyr BP, and the U4 unit represents for the highstand systems tract (HST) with clinoform structure surrounding the modern delta coast, extending to the water depth of 25-30 m, developed by sediments from the Red River system in ~3-0 cal.kyr BP.ReferencesBadley M.E., 1985. Practical Seismic Interpretation. International Human Resources Development Corporation, Boston, 266p.Bergh G.D. V.D., Van Weering T.C.E., Boels J.F., Duc D.M, Nhuan M.T, 2007. Acoustical facies analysis at the Ba Lat delta front (Red River delta, North Vietnam. Journal of Asian Earth Science, 29, 532-544.Boyd R., Dalrymple R., Zaitlin B.A., 1992. Classification of Elastic Coastal Depositional Environments. Sedimentary Geology, 80, 139-150.Catuneanu O., 2002. Sequence stratigraphy of clastic systems: concepts, merits, and pitfalls. Journal of African Earth Sciences, 35, 1-43.Catuneanu O., 2006. Principles of Sequence Stratigraphy. Elsevier, Amsterdam, 375p.Catuneanu O., Abreu V., Bhattacharya J.P., Blum M.D., Dalrymple R.W., Eriksson P.G., Fielding C.R., Fisher W.L., Galloway W.E., Gibling M.R., Giles K.A., Holbrook J.M., Jordan R., Kendall C.G. St. C., Macurda B., Martinsen O.J., Miall A.D., Neal J.E., Nummedal D., Pomar L., Posamentier H.W., Pratt B.R., Sarg J.F., Shanley K.W., Steel R. J., Strasser A., Tucker M.E., Winker C., 2009. Towards the standardization of sequence stratigraphy. Earth-Science Reviews, 92, 1-33.Catuneanu O., Galloway W.E., Kendall C.G. St C., Miall A.D., Posamentier H.W., Strasser A. and Tucker M.. E., 2011. Sequence Stratigraphy: Methodology and Nomenclature. Newsletters on Stratigraphy, 44(3), 173-245.Coleman J.M and Wright L.D., 1975. Modern river deltas: variability of processes and sand bodies. In: Broussard M.L (Ed), Deltas: Models for exploration. Houston Geological Society, Houston, 99-149.Doan Dinh Lam, 2003. History of Holocene sedimentary evolution of the Red River delta. PhD thesis in Vietnam, 129p (in Vietnamese).Duc D.M., Nhuan M.T, Ngoi C.V., Nghi T., Tien D.M., Weering J.C.E., Bergh G.D., 2007. Sediment distribution and transport at the nearshore zone of the Red River delta, Northern Vietnam. Journal of Asian Earth Sciences, 29, 558-565.Dung B.V., Stattegger K., Unverricht D., Phach P.V., Nguyen T.T., 2013. Late Pleistocene-Holocene seismic stratigraphy of the Southeast Vietnam Shelf. Global and Planetary Change, 110, 156-169.Embry A.F and Johannessen E.P., 1992. T-R sequence stratigraphy, facies analysis and reservoir distribution in the uppermost Triassic-Lower Jurassic succession, western Sverdrup Basin, Arctic Canada. In: Vorren T.O., Bergsager E., Dahl-Stamnes O.A., Holter E., Johansen B., Lie E., Lund T.B. (Eds.), Arctic Geology and Petroleum Potential. Special Publication. Norwegian Petroleum Society (NPF), 2, 121-146.Funabiki A., Haruyama S., Quy N.V., Hai P.V., Thai D.H., 2007. Holocene delta plain development in the Song Hong (Red River) delta, Vietnam. Journal of Asian Earth Sciences, 30, 518-529.General Department of Land Administration., 1996. Vietnam National Atlas. General Department of Land Administration, Hanoi, 163p.Hanebuth T.J.J. and Stattegger K., 2004. Depositional sequences on a late Pleistocene-Holocene tropical siliciclastic shelf (Sunda shelf, Southeast Asia). Journal of Asian Earth Sciences, 23, 113-126.Hanebuth T.J.J., Voris H.K.., Yokoyama Y., Saito Y., Okuno J., 2011. Formation and fate of sedimentary depocenteres on Southeast Asia’s Sunda Shelf over the past sea-level cycle and biogeographic implications. Eath-Science Reviews, 104, 92-110.Hanebuth T., Stattegger K and Grootes P. M., 2000. Rapid flooding of the Sunda Shelf: a late-glacial sea-level record. Science, 288, 1033-1035.Helland-Hansen W and Gjelberg, J.G., 1994. Conceptual basis and variability in sequence stratigraphy: a different perspective. Sedimentary Geology, 92, 31-52.Hori K., Tanabe S., Saito Y., Haruyama S., Nguyen V., Kitamura., 2004. Delta initiation and Holocene sea-level change: example from the Song Hong (Red River) delta, Vietnam. Sedimentary Geology, 164, 237-249.Hunt D. and Tucker M.E., 1992. Stranded parasequences and the forced regressive wedge systems tract: deposition during base-level fall. Sedimentology Geology, 81, 1-9.Hunt D. and Tucker M.E., 1995. Stranded parasequences and the forced regressive wedge systems tract: deposition during base-level fall-reply. Sedimentary Geology, 95, 147-160.Lam D.D. and Boyd W.E., 2000. Holocene coastal stratigraphy and model for the sedimentary development of the Hai Phong area in the Red River delta, north Vietnam. Journal of Geology (Series B), 15-16, 18-28.Lieu N.T.H., 2006. Holocene evolution of the Central Red River Delta, Northern Vietnam. PhD thesis of lithological and mineralogical in Germany, 130p.Luu T.N.M., Garnier J., Billen G., Orange D., Némery J., Le T.P.Q., Tran H.T., Le L.A., 2010. Hydrological regime and water budget of the Red River Delta (Northern Vietnam). Journal of Asian Earth Sciences, 37, 219-228.Mather S.J., Davies J., Mc Donal A., Zalasiewicz J.A., and Marsh S., 1996. The Red River Delta of Vietnam. British Geological Survey Technical Report WC/96/02, 41p.Mathers S.J. and Zalasiewicz J.A.,1999. Holocene sedimentary architecture of the Red River delta, Vietnam. Journal of Coastal Research, 15, 314-325.Milliman J.D. and Mead R.H., 1983. Worldwide delivery of river sediment to the oceans. Journal of Geology, 91, 1-21.Milliman J.D and Syvitski J.P.M., 1992. Geomorphic/tectonic control of sediment discharge to the Ocean: the importance of small mountainous rivers. Journal of Geology, 100, 525-544.Mitchum Jr. R.M., Vail P.R., 1977. Seismic stratigraphy and global changes of sea-level. Part 7: stratigraphic interpretation of seismic reflection patterns in depositional sequences. In: Payton C.E. (Ed.), Seismic Stratigraphy-Applications to Hydrocarbon Exploration, A.A.P.G. Memoir, 26, 135-144.Nguyen T.T., 2017. Late Pleistocene-Holocene sedimentary evolution of the South East Vietnam Shelf, PhD thesis (in Vietnamese), Hanoi University of Science, Vietnam, 169p.Nummedal D., Riley G.W., Templet P.T., 1993. High-resolution sequence architecture: a chronostratigraphic model based on equilibrium profile studies. In: Posamentier H.W., Summerhayes C.P., Haq B.U., Allen G.P. (Eds.), Sequence stratigraphy and Facies Associations. International Association of Sedimentologists Special Publication, 18, 55-58.Posamentier H.W. and Allen G.P., 1999. Siliciclastic sequence stratigraphy: concepts and applications. SEPM Concepts in Sedimentology and Paleontology, 7, 210p.Posamentier H.W., Jervey M.T. and Vail P.R., 1988. Eustatic controls on clastic deposition I-Conceptual framework. Sea-level changes-An Integrated Approach, The Society of Economic Paleontologists and Mineralogist. SEPM Special Publication, 42, 109-124.Reineck H.E., Singh I.B., 1980. Depositional sedimentary environments with reference to terrigenous clastics. Springer-Verlag Berlin Heidelberg New York, 551p. Ross K., 2011. Fate of Red River Sediment in the Gulf of Tonkin, Vietnam. Master Thesis. North Carolina State University, 91p.Saito Y., Katayama H., Ikehara K., Kato Y., Matsumoto E., Oguri K., Oda M., Yumoto M. 1998. Transgressive and highstand systems tracts and post-glacial transgression, the East China Sea. Sedimentary Geology, 122, 217-232.Stattegger K., Tjallingii R., Saito Y., Michelli M., Nguyen T.T., Wetzel A., 2013. Mid to late Holocene sea-level reconstruction of Southeast Vietnam using beachrock and beach-ridge deposits. Global and Planetary Change, 110, 214-222.Tanabe S., Hori K., Saito Y., Haruyama S., Doanh L.Q., Sato Y., Hiraide S., 2003a. Sedimentary facies and radiocarbon dates of the Nam Dinh-1 core from the Song Hong (Red River) delta, Vietnam. Journal of Asian Earth Sciences, 21, 503-513.Tanabe S., Hori K., Saito Y., Haruyama S., Phai V.V., Kitamura A., 2003b. Song Hong (Red River) delta evolution related to millennium-scale Holocene sea-level changes. Quaternary Science Reviews, 22(21-22), 2345-2361.Tanabe S., Saito Y., Lan V.Q., Hanebuth T.J.J., Lan N.Q., Kitamura A., 2006. Holocene evolution of the Song Hong (Red River) delta system, northern Vietnam. Sedimentary Geology, 187, 29-61.Thanh T.D. and Huy D.V., 2000. Coastal development of the modern Red River Delta. Bulletin of the Geological Survey of Japan, 5, 276.Tjallingii R., Stattegger K., Wetzel A., Phung VP., 2010. Infilling and flooding of the Mekong River incised valley during deglacial sea-level rise. Quaternary Science Reviews, 29, 1432-1444.Vail P.R., 1987. Seismic stratigraphy interpretation procedure. In: Bally, A.W. (Ed), Atlats of Seismic Stratigraphy. American Association of Petroleum Geologist Studies in Geology, 27, 1-10.Van Wagoner J.C., Posamentier H.W., Mitchum R.M., Vail P.R., Sarg P.R., Louit J.F., Hardenbol J., 1988. An overview of the fundamental of sequence stratigraphy and key definitions. An Integrated Approach, SEPM Special Publication, 42, 39-45.Veeken P.C.H., 2006. Seismic stratigraphy Basin Analysis and Reservoir Characterization. Handbook of geophysical exploration, Elsevier, Oxford, 37509p.Yoo D.G., Kim S.P., Chang T.S., Kong G.S., Kang N.K., Kwon Y.K., Nam S.L., Park S.C., 2014. Late Quaternary inner shelf deposits in response to late Pleistocene-Holocene sea-level changes: Nakdong River, SE Korea. Quaternary International, 344, 156-169.
- Published
- 2018
25. Electroconducting Elements of the Ultradeep Fluid–Fault Systems as Indicators of Seismically Active Zones of the Eastern Margin of the Eurasian Continent: Evidence from Magnetotelluric Data
- Author
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N. N. Trung, Do Huy Cuong, V. M. Nikiforov, A. Yu. Zhukovin, V. B. Kaplun, Duong Quoc Hung, I.M. Varentsov, N. A. Palshin, and G. N. Shkabarnya
- Subjects
geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Viet nam ,Crust ,Fault (geology) ,010502 geochemistry & geophysics ,01 natural sciences ,Magnetotellurics ,Margin (machine learning) ,Eurasian continent ,Earth and Planetary Sciences (miscellaneous) ,General Earth and Planetary Sciences ,Seismology ,Geology ,0105 earth and related environmental sciences - Abstract
A fundamentally new conclusion that zones of high seismic activity are controlled by electroconducting (fluid-saturated) fragments rather than by the entire deep fault is drawn. It is shown that the areal abundance of earthquake foci in geoelectric blocks of the Earth’s crust within Sakhalin and Vietnam containing electroconducting formations is mostly controlled by their roof occurring at a depth of ≤15 km.
- Published
- 2018
26. Improving a maximum horizontal gradient algorithm to determine geological body boundaries and fault systems based on gravity data
- Author
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Tran Van Kha, Le Duc Anh, Do Duc Thanh, Hoang Van Vuong, and Duong Quoc Hung
- Subjects
geography ,Gravity (chemistry) ,Polynomial ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Continental shelf ,Magnitude (mathematics) ,Fault (geology) ,010502 geochemistry & geophysics ,Grid ,01 natural sciences ,Geophysics ,Point (geometry) ,Algorithm ,Gradient method ,Geology ,0105 earth and related environmental sciences - Abstract
The maximum horizontal gradient method was first proposed by Blakely and Simpson (1986) for determining the boundaries between geological bodies with different densities. The method involves the comparison of a center point with its eight nearest neighbors in four directions within each 3 × 3 calculation grid. The horizontal location and magnitude of the maximum values are found by interpolating a second-order polynomial through the trio of points provided that the magnitude of the middle point is greater than its two nearest neighbors in one direction. In theoretical models of multiple sources, however, the above condition does not allow the maximum horizontal locations to be fully located, and it could be difficult to correlate the edges of complicated sources. In this paper, the authors propose an additional condition to identify more maximum horizontal locations within the calculation grid. This additional condition will improve the method algorithm for interpreting the boundaries of magnetic and/or gravity sources. The improved algorithm was tested on gravity models and applied to gravity data for the Phu Khanh basin on the continental shelf of the East Vietnam Sea. The results show that the additional locations of the maximum horizontal gradient could be helpful for connecting the edges of complicated source bodies.
- Published
- 2018
27. A Day-Ahead Forecasting Model for Probabilistic EV Charging Loads at Business Premises
- Author
-
Shariful Islam, Duong Quoc Hung, and Nadarajah Mithulananthan
- Subjects
Mathematical optimization ,business.product_category ,Renewable Energy, Sustainability and the Environment ,020209 energy ,Probabilistic logic ,Maximum likelihood ml ,Statistical parameter ,02 engineering and technology ,Decision variables ,Memory management ,State of charge ,Power demand ,Electric vehicle ,0202 electrical engineering, electronic engineering, information engineering ,business ,Simulation - Abstract
Focusing on every individual electric vehicle (EV) while optimally charging a significant number of EV units at the workplace is normally computationally burdensome. Such charging optimization requires not only a long runtime but also a large CPU memory due to numerous decision variables involved. This paper develops a new combined state of charge (SOC) based methodology to calculate day-ahead combined probabilistic charging loads for a large number of EV units. Here, several models are proposed to estimate different combined statistical parameters based on historical data. The proposed methodology determines the transition of the combined SOC distribution of EV units from one timeslot to the next using these estimated parameters. Various strategies of SOC-based charging (e.g., unfair and fair modes) are investigated to control EV loads. Numerical results show that the proposed SOC-based charging can reduce the number of decision variables significantly, and require less computational time and memory accordingly.
- Published
- 2018
28. Strategic allocation of community energy storage in a residential system with rooftop PV units
- Author
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Junainah Sardi, Duong Quoc Hung, and Nadarajah Mithulananthan
- Subjects
Engineering ,business.industry ,020209 energy ,Mechanical Engineering ,020208 electrical & electronic engineering ,Load following power plant ,Photovoltaic system ,02 engineering and technology ,Building and Construction ,Management, Monitoring, Policy and Law ,Energy storage ,Reliability engineering ,Renewable energy ,General Energy ,Electricity generation ,Distributed generation ,0202 electrical engineering, electronic engineering, information engineering ,Grid-connected photovoltaic power system ,Electric power ,business ,Simulation - Abstract
The electrical power sector has entered an era of decarbonizing energy generation by accommodating more Renewable Energy Sources (RES), especially solar energy in the power grid. However, high penetration of such a resource has negative impacts on the power network such as power fluctuations, reverse power flows and voltage rises. Energy Storage (ES) offers an effective solution to addressing those challenges while improving the load factor as well as the utilization of network infrastructures. This paper proposes a new framework to integrate Community Energy Storage (CES) units in an existing residential community system with rooftop solar Photovoltaic (PV) units. In this framework, three analytical approaches are respectively developed to handle three important parameters of the CES integration (i.e. locations, sizes and operational characteristics) to enhance network performances. Firstly, a simple approach is developed on the basis of a Center of Gravity (COG) theory to determine the location of CES for minimizing the annual energy loss. Secondly, a new analytical formulation based on a load following control method is presented to identify the proper rated capacity of CES and its hourly dispatch strategy for achieving a desired annual load factor. Lastly, a technique to estimate the optimal operational characteristic of CES is proposed for flattening the daily demand profile and improving the voltage profile. The proposed framework is tested on a 19-bus test system while considering the probability of PV generation along with load variations. The numerical results show that the developed framework can bring the system load factor to a maximum of 0.76, at which the penetration levels of CES and PV are at 22% and 5% respectively while reducing the energy loss by 24.21% and enhancing the voltage profile significantly. The results also indicate that 22% CES penetration can reduce the annual purchased energy cost from the grid by 11.1% and the annual energy loss cost by 36.88%, where the system accommodates respective PV penetration levels of 5% and 50%.
- Published
- 2017
29. Application of Fuzzy Control Algorithm to Start a Large - Capacity Synchronous Motor
- Author
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Duong, Quoc Hung, primary, Nguyen, Huu Cong, additional, Nguyen, Hong Quang, additional, and Nguyen, Cuong, additional
- Published
- 2020
- Full Text
- View/download PDF
30. Impacts of single-phase PV injection on voltage quality in 3-phase 4-wire distribution systems
- Author
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Duong Quoc Hung and Yateendra Mishra
- Subjects
Materials science ,Voltage Deviation ,Pv generation ,020209 energy ,Distribution Systems ,Photovoltaic system ,voltage unbalance factor ,02 engineering and technology ,Integrated circuit ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,Automotive engineering ,law.invention ,Distribution system ,law ,0202 electrical engineering, electronic engineering, information engineering ,Neutral-Point Shifting ,Load model ,Single phase ,090608 Renewable Power and Energy Systems Engineering (excl. Solar Cells) ,Electrical conductor ,Photovoltaic systems ,Voltage - Abstract
Single-phase solar photovoltaic (PV) injections in distribution systems can lead to voltage rise problems. This paper presents a mathematical framework to evaluate the phenomenon of rise in the voltage due to single-phase PV injections in 3-phase 4-wire distribution systems. The impacts of single-phase PV generation on neutral-point shifting and its effects on voltage unbalance criteria (e.g., NEMA standards) are thoroughly investigated. Injection of single-phase PV increases the voltage on that phase while decreasing the voltage on other phases, worsening the voltage unbalance problem. Furthermore, the influence of ZIP load models on voltage quality is investigated. This accurate load model can help reducing voltage unbalance factors for a given PV penetration level.
- Published
- 2018
31. A multiobjective voltage unbalance factor for PV hosting capacity with probabilistic ZIP load models
- Author
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Yateendra Mishra and Duong Quoc Hung
- Subjects
PV hosting capacity ,Computer science ,020209 energy ,Distribution Systems ,Photovoltaic system ,Probabilistic logic ,02 engineering and technology ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,ZIP load model ,Power Quality ,Control theory ,Factor (programming language) ,0202 electrical engineering, electronic engineering, information engineering ,090608 Renewable Power and Energy Systems Engineering (excl. Solar Cells) ,computer ,Low voltage ,Electrical conductor ,computer.programming_language ,Voltage ,Voltage Unbalance Factor - Abstract
This paper proposes a multiobjective voltage unbalance factor to estimate single-phase photovoltaic (PV) hosting capacity in 3-phase residential networks. This factor is derived from a combination of various components, including zero and negative-sequence voltage unbalance factors associated with the inherent variability and uncertainty of both loads and PV generation. A time-varying probabilistic ZIP load model is also incorporated in the proposed factor to characterize the uncertainty of voltage-dependent loads within each hour of a day over four seasons. The location, size and phase allocation of PV units are randomly generated. Simulation results obtained on a modified IEEE 4-bus test feeder and the IEEE European low voltage test feeder show that the developed approach can provide a better response to the hourly-varying and uncertain behaviors of loads and generation.
- Published
- 2018
32. CHARACTERISTICS OF THE TOPOGRAPHY AND GEOLOGY OF VUNG MAY SEA MOUNTAIN AREA, TRUONG SA, VIETNAM
- Author
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Duong Quoc Hung, Le Dinh Nam, Phi Truong Thanh, and Nguyen Van Diep
- Subjects
Geomorphology ,Geology - Published
- 2017
33. Anomalies of natural gases in the Gulf of Tonkin (South China Sea)
- Author
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Phung Van Phach, Anatoly Obzhirov, V. A. Akulichev, N. S. Syrbu, N. S. Polonik, Renat Shakirov, Le Duc Anh, Nguyen Nhu Trung, E. V. Maltseva, and Duong Quoc Hung
- Subjects
Oceanography ,South china ,Natural gas ,business.industry ,Earth and Planetary Sciences (miscellaneous) ,General Earth and Planetary Sciences ,business ,Geology - Published
- 2015
34. Determining PV Penetration for Distribution Systems With Time-Varying Load Models
- Author
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Kwang Y. Lee, Nadarajah Mithulananthan, and Duong Quoc Hung
- Subjects
time-varying load model ,Engineering ,loss reduction ,multiobjective index ,solar energy ,Energy Engineering and Power Technology ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,energy-loss ,distributed power generation ,allocation ,Control theory ,generation ,Electrical and Electronic Engineering ,reactive power ,reconfiguration ,business.industry ,Photovoltaic system ,Probabilistic logic ,090000 ENGINEERING ,voltage deviation ,Control reconfiguration ,Penetration (firestop) ,AC power ,pv systems ,Solar energy ,power generation planning ,photovoltaic (pv) penetration ,090600 ELECTRICAL AND ELECTRONIC ENGINEERING ,optimal placement ,power system planning ,Distributed generation ,network ,voltage ,business ,optimization ,Voltage - Abstract
A constant or voltage-dependent load model is usually assumed in most distributed generation (DG) planning studies. However, this paper proposes several different types of time-varying voltage-dependent load models to determine the penetration level of photovoltaic (PV) units in a distribution network. Here, a new analytical expression is first proposed to size a PV unit, which can supply active and reactive powers. This expression is based on the derivation of a multiobjective index (IMO) that is formulated as a combination of three indices, namely active power loss, reactive power loss and voltage deviation. The expression is then adapted to allocate PV units while considering the time-varying load models and probabilistic PV generation. The effectiveness of the proposed approach was validated on 69- and 33-bus test distribution systems. The results showed that PV allocation with different types of time-varying load models can produce dissimilar penetration levels.
- Published
- 2014
35. Intelligent Network Integration of Distributed Renewable Generation
- Author
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Nadarajah Mithulananthan, Duong Quoc Hung, Kwang Y. Lee, Nadarajah Mithulananthan, Duong Quoc Hung, and Kwang Y. Lee
- Subjects
- Renewable energy sources--Data processing, Distributed generation of electric power
- Abstract
This book introduces several simple analytical approaches to aid the seamless integration of renewable distributed generation. It focuses on the idea of intelligent integration, which involves locating and developing suitable operational characteristics of renewable distributed generation. After reviewing the options available, the best location should be chosen, an appropriately sized operation should be installed and the most suitable operational characteristics should be adopted. Presenting these simple analytical approaches, their step-by-step implementation and a number of cases studies using test distribution systems, the book clearly demonstrates the technical, economic and environmental benefits of intelligent integration.
- Published
- 2017
36. An intelligent hybrid short-term load forecasting model for smart power grids
- Author
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Mithulananthan Nadarajah, Muhammad Qamar Raza, Duong Quoc Hung, and Zuhairi Baharudin
- Subjects
Engineering ,Mathematical optimization ,Energy management ,020209 energy ,Geography, Planning and Development ,Global best particle swarm optimization (GPSO) ,Transportation ,02 engineering and technology ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,Electric power system ,Levenberg marquardt (LM) ,Smart power grids ,Short-term load forecasting (STLF) ,0202 electrical engineering, electronic engineering, information engineering ,Mean absolute percentage error (MAPE) ,Simulation ,Civil and Structural Engineering ,Building automation ,Artificial neural network (ANN) ,Fitness function ,Artificial neural network ,Renewable Energy, Sustainability and the Environment ,business.industry ,Particle swarm optimization ,Grid ,Meteorological and exogenous variables ,Term (time) ,business ,Back propagation (BP) - Abstract
An accurate load forecasting is always particularly important for optimal planning and energy management in smart buildings and power systems. Millions of dollars can be saved annually by increasing a small degree of improvement in prediction accuracy. However, forecasting load demand accurately is a challenging task due to multiple factors such as meteorological and exogenous variables. This paper develops a novel load forecasting model, which is based on a feed-forward artificial neural network (ANN), to predict hourly load demand for various seasons of a year. In this model, a global best particle swarm optimisation (GPSO) algorithm is applied as a new training technique to enhance the performance of ANN prediction. The fitness function is defined and a weight bias encoding/decoding scheme is presented to improve network training. Influential meteorological and exogenous variables along with correlated lagged load data are also employed as inputs in the presented model. The data of an ISO New England grid are used to validate the performance of the developed model. The results demonstrate that the proposed forecasting model can provide significantly better forecast accuracy, training performances and convergence characteristics than contemporary techniques found in the literature.
- Published
- 2017
37. Multiple community energy storage planning in distribution networks using a cost-benefit analysis
- Author
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Junainah Sardi, Marcus Gallagher, Duong Quoc Hung, and Nadarajah Mithulananthan
- Subjects
Engineering ,Discounted payback period ,020209 energy ,integration ,02 engineering and technology ,Power factor ,pv ,Management, Monitoring, Policy and Law ,load model ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,Net present value ,Energy storage ,photovoltaic ,allocation ,0202 electrical engineering, electronic engineering, information engineering ,distributed generation ,distribution-systems ,business.industry ,Mechanical Engineering ,cost-benefit analysis ,Photovoltaic system ,090000 ENGINEERING ,Building and Construction ,021001 nanoscience & nanotechnology ,Reliability engineering ,090600 ELECTRICAL AND ELECTRONIC ENGINEERING ,General Energy ,Electricity generation ,community energy storage planning ,Distributed generation ,Profitability index ,0210 nano-technology ,business - Abstract
This paper proposes a strategy for optimal allocation of multiple Community Energy Storage (CES) units in a distribution system with photovoltaic (PV) generation. The main contribution of this strategy is it considers all possible benefits accrued from and costs incurred by CES deployment to a utility. The benefits are gained from energy arbitrage, peaking power generation, energy loss reduction, system upgrade deferral, emission reduction and VAr support. A cost-benefit analysis is also conducted to identify the optimal Net Present Value (NPV), Discounted Payback Period (DPP) and Benefit-Cost ratio (BCR). Moreover, an optimal power factor approach is included in the analysis to dispatch CES units to improve load factors and voltage profiles. The probabilistic distribution of solar irradiance is also incorporated in the proposed strategy to consider the uncertainty of PV generation. Several sensitivity analyses are carried out to investigate the effects of PV penetration, load models and the number of CES units deployed on the profitability of CES investment. Numerical results show that the proposed strategy enables a power utility to identify the location, size and operational characteristic of CES units for maximizing the total NPV and enhancing load factors and voltage profiles. (C) 2016 Elsevier Ltd. All rights reserved.
- Published
- 2017
38. Optimal placement of dispatchable and nondispatchable renewable DG units in distribution networks for minimizing energy loss
- Author
-
Kwang Y. Lee, Duong Quoc Hung, and Nadarajah Mithulananthan
- Subjects
Mathematical optimization ,Engineering ,Energy loss ,energy loss ,optimal allocation ,Energy Engineering and Power Technology ,Power factor ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,dispatchable dg ,Reduction (complexity) ,power-systems ,optimal power factor operation ,Electrical and Electronic Engineering ,nondispatchable dg ,Dispatchable generation ,distributed generation ,algorithm ,reconfiguration ,business.industry ,radial-distribution systems ,loss minimization ,090000 ENGINEERING ,renewable energy ,Renewable energy ,Power (physics) ,090600 ELECTRICAL AND ELECTRONIC ENGINEERING ,Distributed generation ,business ,optimization ,generation sources ,Energy (signal processing) - Abstract
This paper presents a methodology for the integration of dispatchable and nondispatchable renewable distributed generation (DG) units for minimizing annual energy losses. In this methodology, analytical expressions are first proposed to identify the optimal size and power factor of DG unit simultaneously for each location for minimizing power losses. These expressions are then adapted to place renewable DG units for minimizing annual energy losses while considering the time-varying characteristics of demand and generation. A combination of dispatchable and nondispatchable DG units is also proposed in this paper. The proposed methodology has been applied to a 69-bus test distribution system with different scenarios. The results demonstrate that dispatchable DG units or a combination of dispatchable and nondispatchable DG units can lead to a substantial reduction in annual energy losses when compared to nondispatchable DG units. The results also show that a maximum annual energy loss reduction is achieved for all scenarios proposed with DG operation at optimal power factor. (C) 2013 Elsevier Ltd. All rights reserved.
- Published
- 2014
39. Loss reduction and loadability enhancement with DG: A dual-index analytical approach
- Author
-
Nadarajah Mithulananthan and Duong Quoc Hung
- Subjects
optimal power factor ,Engineering ,loadability ,multiobjective index ,optimal size ,Power factor ,Management, Monitoring, Policy and Law ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,Distribution system ,Control theory ,distributed generation units ,distribution-systems ,business.industry ,Mechanical Engineering ,090000 ENGINEERING ,reactive power dispatch ,wind farms ,reactive power loss ,Building and Construction ,AC power ,090600 ELECTRICAL AND ELECTRONIC ENGINEERING ,Voltage stability ,optimal placement ,General Energy ,voltage stability ,strategies ,Distributed generation ,active power loss ,load models ,business ,optimization - Abstract
The high penetration of distributed generation (DG) is a new challenge for traditional distribution systems. Power injections from DG units change network power flows, thereby influencing system losses and voltage stability. This paper presents a new multiobjective index (IMO)-based analytical approach to determine the optimal size and power factor of DG unit for reducing power losses and enhancing loadability. This index is defined as a combination of active and reactive power loss indices by optimally assigning a weight to each index such that the IMO can reach a minimum level. At this level, the optimal location and weights are identified. The proposed methodology has been tested on three typical distribution systems with different characteristics and validated using an exhaustive load flow (ELF) solution. The results show that DG operation with optimal power factor and appropriate weights for active and reactive power losses can significantly reduce power losses and enhance loadability.
- Published
- 2014
40. Distribution System Modelling
- Author
-
Duong Quoc Hung, Kwang Y. Lee, and Nadarajah Mithulananthan
- Subjects
Computer science ,business.industry ,020209 energy ,Photovoltaic system ,Probability density function ,02 engineering and technology ,AC power ,Solar irradiance ,Reliability engineering ,Power (physics) ,Renewable energy ,020401 chemical engineering ,Distributed generation ,0202 electrical engineering, electronic engineering, information engineering ,0204 chemical engineering ,Synchronous motor ,business - Abstract
This chapter presents distribution system modelling required for Distributed Generation (DG) integration studies. The model of distribution systems covers loads and generation sources. Loads modelled using time-varying voltage-dependent loads or time-varying loads associated with exponents for voltage-dependent loads are highlighted in this chapter. From the generation-side, how to model different technologies, including biomass, solar Photovoltaic (PV) and battery energy storage is clearly explained to better represent their P-Q capacity characteristics. PV output power represented by a probability density function is also thoroughly presented with mathematical expressions. Finally, three test distribution networks used in this book to verify various methodologies and showcase the benefits achieved from intelligent integration of renewable DG units are described in detail.
- Published
- 2016
41. Biomass DG Integration
- Author
-
Duong Quoc Hung, Kwang Y. Lee, and Nadarajah Mithulananthan
- Subjects
Mathematical optimization ,business.industry ,Computer science ,Distributed generation ,Biomass ,Point (geometry) ,Power factor ,AC power ,business ,Expression (mathematics) ,Energy (signal processing) ,Power (physics) - Abstract
This chapter provides a comprehensive coverage of the intelligent integration of biomass Distributed Generation (DG) from a power and energy loss point of view. The intelligent integration that determines the optimal location, size, operating power factor and operational characteristics of DG units is presented in a step-by-step manner considering time-varying load demand. Firstly, analytical expressions are developed to calculate the optimal sizes of DG units at various locations in a distribution network to minimise the overall power and energy losses. Secondly, the optimal sizes of active and reactive power are calculated separately and then combined based on an analytical expression to specify the optimal power factor. Finally, the methodologies are developed to identify the optimal locations along with optimal sizes and power factors. The results obtained on two test distribution systems show the importance of selecting the best locations, sizes and power factors in minimizing the power and energy losses in both the test systems. The major conclusions that can be drawn from this case study are also highlighted at the end of the chapter.
- Published
- 2016
42. PV Integration
- Author
-
Nadarajah Mithulananthan, Duong Quoc Hung, and Kwang Y. Lee
- Published
- 2016
43. PV and EV Integration
- Author
-
Duong Quoc Hung, Nadarajah Mithulananthan, and Kwang Y. Lee
- Subjects
business.product_category ,business.industry ,Photovoltaic system ,Probabilistic logic ,Electrical engineering ,Power factor ,AC power ,Power (physics) ,Hardware_GENERAL ,Electric vehicle ,Environmental science ,Dispatchable generation ,business ,Voltage - Abstract
Electric Vehicle (EV) charging stations are usually considered to consume active power only in most planning studies. This chapter proposes an analytical approach to adopt plug-in hybrid EV charging stations that considers reactive power support in a medium voltage commercial distribution network with Photovoltaic (PV) units. In this study, expressions are derived from the apparent power loss to size charging stations with dispatchable power factors for minimizing voltage deviations. Such stations are employed to charge aggregated EV units parked in a public area. The developed expressions are then adapted to accommodate EV charging stations while considering the time-varying voltage-dependent load models and the probability of PV generation and EV charging. The simulation results show that properly adopted charging stations with dispatchable power factors can enhance probabilistic voltage profiles.
- Published
- 2016
44. PV and BES Integration
- Author
-
Nadarajah Mithulananthan, Duong Quoc Hung, and Kwang Y. Lee
- Published
- 2016
45. Introduction
- Author
-
Nadarajah Mithulananthan, Duong Quoc Hung, and Kwang Y. Lee
- Published
- 2016
46. Biomass Integration—A Cost Benefit Analysis
- Author
-
Kwang Y. Lee, Nadarajah Mithulananthan, and Duong Quoc Hung
- Subjects
Reduction (complexity) ,Mathematical optimization ,Cost–benefit analysis ,Computer science ,business.industry ,Total cost ,Distributed generation ,Time horizon ,Power factor ,AC power ,business ,Investment (macroeconomics) - Abstract
This chapter presents new analytical expressions to efficiently capture the optimal power factor of each distributed Generation (DG) unit for reducing energy losses and enhancing voltage stability over a given planning horizon. These expressions are based on the derivation of a multiobjective index, which is formulated as a combination of active and reactive power loss indices. The decision for the optimal location, size and number of DG units is then obtained through a benefit–cost analysis. Here, the total benefit includes energy sales and additional benefits, namely energy loss reduction, network upgrade deferral and emission reduction. The total cost is a sum of capital, operation and maintenance costs. The simulation results show that the additional benefits are imperative. Inclusion of these in the analysis can yield faster DG investment recovery.
- Published
- 2016
47. Determining the size of PHEV charging stations powered by commercial grid-integrated PV systems considering reactive power support
- Author
-
Hieu Trinh, Duong Quoc Hung, and Zhao Yang Dong
- Subjects
Engineering ,020209 energy ,energy loss ,design ,02 engineering and technology ,Management, Monitoring, Policy and Law ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,Maximum power point tracking ,plug ,mitigation ,0202 electrical engineering, electronic engineering, information engineering ,Grid-connected photovoltaic power system ,sustainable energy ,hybrid electric vehicle ,plug-in hybrid electric vehicle ,distributed generation ,business.industry ,probabilistic reactive power ,Mechanical Engineering ,020208 electrical & electronic engineering ,Photovoltaic system ,Electrical engineering ,090000 ENGINEERING ,solar electricity ,Building and Construction ,environmental impacts ,AC power ,load ,Sizing ,090600 ELECTRICAL AND ELECTRONIC ENGINEERING ,General Energy ,time-varying commercial charging load model ,Distributed generation ,photovoltaic power ,network ,Electricity ,solar photovoltaic ,business ,Voltage - Abstract
Due to low electricity rates at nighttime, home charging for electric vehicles (EVs) is conventionally favored. However, the recent tendency in support of daytime workplace charging that absorbs energy produced by solar photovoltaic (PV) panels appears to be the most promising solution to facilitating higher PV and EV penetration in the power grid. This paper studies optimal sizing of workplace charging stations considering probabilistic reactive power support for plug-in hybrid electric vehicles (PHEVs), which are powered by PV units in medium voltage (MV) commercial networks. In this study, analytical expressions are first presented to estimate the size of charging stations integrated with PV units with an objective of minimizing energy losses. These stations. are capable of providing reactive power support to the main grid in addition to charging PHEVs while considering the probability of PV generation. The study is further extended to investigate the impact of time-varying voltage-dependent charging load models on PV penetration. The simulation results obtained on an 18-bus test distribution system show that various charging load models can produce dissimilar levels of PHEV and PV penetration. Particularly, the maximum energy loss and peak load reductions are achieved at 70.17% and 42.95% respectively for the mixed charging load model, where the system accommodates respective PHEV and PV penetration levels of 9.51% and 50%. The results of probabilistic voltage distributions are also thoroughly reported in the paper. (C) 2016 Elsevier Ltd. All rights reserved.
- Published
- 2016
48. A comprehensive community energy storage planning strategy based on a cost-benefit analysis
- Author
-
Sardi, Junainah, Mithulananthan, N., and Duong Quoc Hung
- Subjects
090600 ELECTRICAL AND ELECTRONIC ENGINEERING ,energy storage ,cost-benefit analysis ,090000 ENGINEERING ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,power distribution planning ,losses - Abstract
Energy Storage (ES) has been seen as a crucial element in active distribution networks. It facilitates a high penetration level of intermittent renewable energy in power systems thus provide several technical and economic benefits to the utility and consumer. However, given a high capital cost associated with ES, it is crucial to develop an effective planning strategy to avail the maximum benefit. This paper proposes a methodology to determine the optimal location and capacity of Community Energy Storage (CES) units by considering all their possible benefits and costs. The benefits are obtained from energy arbitrage, peaking power generation, energy losses reduction, Transmission and Distribution (TD) system upgrade deferral, CO2 emission reduction and VAr support, while the costs include CES's capital, replacement and Operational and Maintenance (OM) costs. A comprehensive cost-benefit analysis is conducted to identify the optimal Net Present Value (NPV), Discounted Payback Period (DPP) and Benefit Cost ratio (BCR) of CES investment starting at current year, year 2025 and 2035. Numerical results show that the proposed strategy is able to specify the optimal location and size of CES unit for maximizing the NPV. Some interesting findings are also discussed in the paper.
- Published
- 2016
49. A combined practical approach for distribution system loss reduction
- Author
-
Duong Quoc Hung, Ramesh C. Bansal, and Nadarajah Mithulananthan
- Subjects
Engineering ,loss reduction ,Primary distribution systems ,Capacitors ,Network reconfiguration ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,Network re-configuration ,law.invention ,Distributed power generation ,Reduction (complexity) ,Distribution system ,Capacitor placement ,Control theory ,law ,Distribution system loss ,distribution system ,distributed generation ,reconfiguration ,Renewable Energy, Sustainability and the Environment ,business.industry ,Distributed generation units ,Local area networks ,090000 ENGINEERING ,Control reconfiguration ,Building and Construction ,Distribution systems ,Power (physics) ,090600 ELECTRICAL AND ELECTRONIC ENGINEERING ,Capacitor ,Distributed generation ,capacitor ,Constant load ,business - Abstract
This paper investigates the loss reduction potential of primary distribution systems with distributed generation (DG) units, capacitors and network reconfiguration. A methodology is proposed to combine different types of DG units and capacitors for minimising losses. A combination of reconfiguration, DG and capacitor placement to obtain high loss reduction is also presented. The results obtained on a 33-bus test distribution system with constant load condition and a 687-bus real distribution system with varying load conditions show significant loss reduction using the proposed approach. The combination of type 1 DG (i.e. DG capable of delivering real power only) and capacitor placement or reconfiguration with type 1 DG and capacitor placement can be viable for minimising losses. © 2013, © 2013 Taylor & Francis.
- Published
- 2013
50. Analytical strategies for renewable distributed generation integration considering energy loss minimization
- Author
-
Nadarajah Mithulananthan, Duong Quoc Hung, and Ramesh C. Bansal
- Subjects
Energy loss ,Engineering ,Mathematical optimization ,Renewable distributed generation ,energy loss ,penetration ,Power factor ,Management, Monitoring, Policy and Law ,090607 Power and Energy Systems Engineering (excl. Renewable Power) ,allocation ,distribution system ,distribution-systems ,algorithm ,Analytical expressions ,business.industry ,Mechanical Engineering ,voltage control ,Photovoltaic system ,090000 ENGINEERING ,wind farms ,Building and Construction ,renewable energy ,placement ,Renewable energy ,090600 ELECTRICAL AND ELECTRONIC ENGINEERING ,General Energy ,Analytical approach ,Distributed generation ,distributed generation (dg) ,Minification ,resources ,business ,optimization - Abstract
This paper presents three alternative analytical expressions, including two new expressions, to determine the optimum sizes and operating strategy of distributed generation (DG) units considering power loss minimization and a methodology to identify the best location. These expressions can be easily adapted to consider the renewable DG units (i.e., biomass, wind and photovoltaic) for minimizing energy losses by considering time-varying demand and possible operating conditions of DG units. The results obtained on a 69-bus distribution test system demonstrate that the proposed approaches can be adequate to determine the location, size and power factor of DG unit for minimizing energy losses. The alternative expressions can be utilized depending on availability of required data and these produce similar outcomes. Highlights A methodology for different renewable DG allocation for energy loss minimization Three alternative analytical expressions for identifying the optimum size An analytical expression for calculating the optimum power factor
- Published
- 2013
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