85 results on '"Binxin Zhu"'
Search Results
2. High frequency and high power density bipolar DC–DC converter with GaN HEMT
- Author
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Yujin Yang, Yu Liu, Yuhui Zhao, Jiaxin Liu, and Binxin Zhu
- Subjects
GaN ,High frequency ,High power density ,Bipolar DC–DC converter ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Bipolar DC–DC converter plays an important role in data center and distributed renewable energy unit with the advantages of high efficiency and low cost. In order to improve the power density of bipolar DC–DC converter, a high frequency and high power density bipolar DC–DC converter based on Gallium Nitride High Electron Mobility Transistor (GaN HEMT) is proposed under the development trend of miniaturization, lightweight and high power density of power electronic converter. By using gallium nitride (GaN) switch device, the switching frequency of the converter is increased to 1 MHz, which effectively reduces the volume and weight of the device. In addition, through the design of high frequency driver circuit, two separate pull-up/pull-down outputs are provided for the control signal, and the rising and falling rates of the switch signal are controlled by adjusting the resistance to obtain good performance and driving stability. The experimental results show that the total weight of the converter with radiator is only 121.6 g, the power density is 35.23 W/in3, and the maximum efficiency can reach 92.7%. Compared with the same type of converter, the volume and weight of the converter are greatly reduced, effectively realizing the goals of miniaturization, lightweight and high power density of the converter.
- Published
- 2023
- Full Text
- View/download PDF
3. A high-reliability SEPIC converter with reconfigurable voltage conversion gain
- Author
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Binxin Zhu, Jiaxin Liu, Yu Liu, Shubo Zhi, and Yuhui Zhao
- Subjects
High reliability ,SEPIC converter ,Reconfigurable voltage conversion gain ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
A high-reliability SEPIC converter with reconfigurable voltage conversion gain is proposed, which is composed of a basic SEPIC converter and n extended units. Adopting an interleaved parallel structure on the input side of the converter not only achieves leg-level hardware redundancy but also reduces the input current ripple. When one branch of the converter suddenly changes or fails, due to the redundancy between branches, the converter can still to work, and the duty cycle of the other branches can be readjusted by using PI control without changing output voltage and power of the converter. This feature undoubtedly presents the reliability of the converter. On the contrary, when the converter works in normal operation, it can also actively control operation mode of each branch to achieve reconfigurable voltage conversion gain function. In addition, since the duty cycles of the switches are not limited, voltage conversion gain of the converter is widely, which makes it more suitable for the occasions where the input side fluctuates greatly. Section 2 details the working principle of the proposed converter and the voltage and current stress on components. Then, the reconfigurable voltage conversion gain of the converter and its high reliability characteristics are analyzed in Section 3. Finally, the correctness of the theoretical analysis is verified by experiments.
- Published
- 2023
- Full Text
- View/download PDF
4. Active Equalization for Lithium-Iron Battery Pack Based on Reduced-Order Solving Strategy for the Hanoi Tower Problem
- Author
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Zhengyu Xia, Xi Chen, Xingjiang Chi, Binxin Zhu, Lei Zhang, and Yuehua Huang
- Subjects
lithium-iron battery pack ,active equalization ,bidirectional Cuk converter ,Hanoi tower problem ,Technology - Abstract
In order to address the energy imbalance issue of a series-connected lithium-iron battery pack, this paper proposes an active equalization method based on a reduced-order solving strategy for the Hanoi Tower problem. The proposed scheme utilizes a combined structure of a switching-network circuit and a bidirectional Cuk converter and leverages an ultracapacitor cell as the energy-transfer carrier. Simulation and comparison demonstrate that the exchange of unbalanced energy within the battery pack can be achieved. The proposed approach can effectively achieve various balancing modes such as cell-to-cell, cell-to-string, string-to-cell, and string-to-string with a relatively fast balancing speed.
- Published
- 2024
- Full Text
- View/download PDF
5. Deep learning‐based SCUC decision‐making: An intelligent data‐driven approach with self‐learning capabilities
- Author
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Nan Yang, Cong Yang, Chao Xing, Di Ye, Junjie Jia, Daojun Chen, Xun Shen, Yuehua Huang, Lei Zhang, and Binxin Zhu
- Subjects
Distribution or transmission of electric power ,TK3001-3521 ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 - Abstract
Abstract This paper proposes an intelligent Deep Learning (DL) based approach for Data‐Driven Security‐Constrained Unit Commitment (DD‐SCUC) decision‐making. The proposed approach includes data pre‐processing and a two‐stage decision‐making process. Firstly, historical data is accumulated and pre‐processed. Then, the DD‐SCUC model is created based on the Gated Recurrent Unit‐Neural Network (GRU‐NN). The mapping model between system daily load and decision results is created by training the DL model with historical data and then is utilized to make SCUC decisions. The two‐stage decision‐making process outputs the decision results based on various applications and scenarios. This approach has self‐learning capabilities because the accumulation of historical data sets can revise the mapping model and therefore improve its accuracy. Simulation results from the IEEE 118‐bus test system and a real power system from China showed that compared with deterministic Physical‐Model‐Driven (PMD)‐SCUC methods, the approach has higher accuracy, better efficiency in the practical use case, and better adaptability to different types of SCUC problems.
- Published
- 2022
- Full Text
- View/download PDF
6. A Comprehensive Review of Security-constrained Unit Commitment
- Author
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Nan Yang, Zhenqiang Dong, Lei Wu, Lei Zhang, Xun Shen, Daojun Chen, Binxin Zhu, and Yikui Liu
- Subjects
Security-constrained unit commitment ,electricity market ,accurate model ,AC power flow ,data-driven ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 ,Renewable energy sources ,TJ807-830 - Abstract
Security-constrained unit commitment (SCUC) has been extensively studied as a key decision-making tool to determine optimal power generation schedules in the operation of electricity market. With the development of emerging power grids, fruitful research results on SCUC have been obtained. Therefore, it is essential to review current work and propose future directions for SCUC to meet the needs of developing power systems. In this paper, the basic mathematical model of the standard SCUC is summarized, and the characteristics and application scopes of common solution algorithms are presented. Customized models focusing on diverse mathematical properties are then categorized and the corresponding solving methodologies are discussed. Finally, research trends in the field are prospected based on a summary of the state-of-the-art and latest studies. It is hoped that this paper can be a useful reference to support theoretical research and practical applications of SCUC in the future.
- Published
- 2022
- Full Text
- View/download PDF
7. A Multi-Agent Game-Based Incremental Distribution Network Source–Load–Storage Collaborative Planning Method Considering Uncertainties
- Author
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Nan Yang, Ye He, BangTian Dong, Tao Qin, Li Ding, XingLei Yang, JunWei Yao, YueHua Huang, ShuoHao Wang, Lei Zhang, BinXin Zhu, Wei Xiong, and YuLun Ren
- Subjects
multi-agent planning ,robust optimization ,dynamic–static joint game ,iterative search method ,collaborative planning ,General Works - Abstract
How to obtain the optimal decision-making scheme based on the investment behavior of various stakeholders is an important issue that needs to be solved urgently in incremental distribution network planning. To this end, this article introduces the virtual player “Nature” to realize the combination of the game theory and robust optimization and proposes an incremental distribution network source–load–storage collaborate planning method with a multi-agent game. First, the planning and decision-making models of a DG investment operator, a distribution network (DN) company, power consumers, and a distributed energy storage (DES) investment operator are constructed, respectively. Then the static game behaviors between the DG investment operator and distribution network company, as well as the DG investment operator and the DES investment operator, are analyzed based on the transfer relations between these four participants. At the same time, robust optimization is used to deal with the uncertainty of the DG output, and the virtual player “Nature” is introduced to study the dynamic game behavior between the DG investment operator and the distribution company. Finally, a dynamic–static joint game planning model is proposed. The simulation results verify the correctness and effectiveness of the proposed method.
- Published
- 2022
- Full Text
- View/download PDF
8. An Interleaved Zero-Voltage Zero-Current Switching High Step-Up DC-DC Converter
- Author
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Binxin Zhu, Shihuan Chen, Yao Zhang, and Yu Huang
- Subjects
Interleaved ,passive snubber circuit ,ZVZCS ,high step-up ,high efficiency ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
An interleaved zero-voltage zero-current switching (ZVZCS) high step-up DC-DC converter is proposed for modern photovoltaic power generation systems. The proposed converter can achieve high voltage conversion gain without operating under extreme duty cycles. The voltage conversion gain can be readily adjusted by selecting different numbers of the diode-capacitor multiplier (DCM) cells in the circuit at the design stage. Moreover, with the passive snubber circuit in the proposed converter, all power switches and diodes in the DCMs can achieve zero-voltage turn-off and zero-current turn-on, which effectively reduces switching losses and increases the overall converter efficiency. The operational principles and analysis of the performance analysis with two DCMs are presented for demonstrative purpose. The effectiveness of the proposed ZVZCS DC-DC converter is validated using an 800W experimental prototype.
- Published
- 2021
- Full Text
- View/download PDF
9. Emergency Load Shedding Strategy for Microgrids Based on Dueling Deep Q-Learning
- Author
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Can Wang, Hongliang Yu, Lin Chai, Huikang Liu, and Binxin Zhu
- Subjects
Microgrid ,emergency load shedding ,deep Q-learning ,frequency adjustment effect ,frequency recovery ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
The rapid drop of frequency under the disturbance is a major threat to the safe and stable operation of a microgrid (MG) system. Emergency load shedding is the main measure to prevent continuous frequency drop and power outage. The existing load shedding strategies have poor adaptability to deal with the problem of MG load shedding under different disturbance situations, and it is difficult to ensure the safe and stable operation of an MG in different operating environments. To address this problem, this paper proposes a data-driven load shedding strategy. First, considering the importance of the load and the frequency recovery time of the system, a load shedding contribution indicator is designed that takes into account the load frequency adjustment effect and the load shedding priority. This contribution indicator is introduced as a load shedding criterion into the reward value function of dueling deep Q learning. Second, considering the suddenness and uncertainty of emergency load shedding, a MG emergency load shedding strategy (ELSS) based on dueling deep Q-learning is proposed. On this basis, the dueling deep Q learning algorithm is used to obtain the load shedding decision with the maximum cumulative reward. Finally, taking the MG load shedding cases in two different scenarios as examples, a simulation study is carried out on a modified IEEE-25 bus MG. The simulation results show that, compared with the model-driven implicit enumeration strategy (IES), the proposed ELSS has superiority in maintaining stable power supply for important loads and reducing load shedding decision-making time and frequency fluctuations.
- Published
- 2021
- Full Text
- View/download PDF
10. Single-Switch High Step-Up Zeta Converter Based on Coat Circuit
- Author
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Binxin Zhu, Guanghui Liu, Yao Zhang, Yu Huang, and Shishi Hu
- Subjects
Zeta converter ,single-switch ,high voltage gain ,low voltage stress ,dc-dc converter ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
By the negative influence of parasitic parameters from the components, the voltage step-up capacity of basic dc-dc converters is limited at extremely high duty cycle. Which makes the traditional dc-dc converters are difficult to be applied to renewable energy generation systems such as fuel cell and photovoltaic (PV) systems. In this study, a single-switch high step-up Zeta converter is proposed based on the basic Zeta converter and corresponding coat circuit. By using the coat circuit, the proposed converter not only can achieve higher voltage gain, but also acquire lower voltage stress on the semiconductor devices. Therefore, the devices with lower conduction resistances can be used to improve the efficiency. Furthermore, the coat circuit is composed of passive components, which does not change the continuous output current characteristic of the basic Zeta converter. And the proposed converter has only one active switch, the drive and control circuits are simple. The operation principle and the performance analysis of the proposed Zeta converter are described in detail, and a 300 W closed-loop experimental prototype has been developed for verification.
- Published
- 2021
- Full Text
- View/download PDF
11. A Fault Signal Processing Method Based on An Improved Prony Algorithm
- Author
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Nan Yang, Yanming Lu, Jianmei Zhang, Zhenzhen Zhang, Li Ding, Cong Yang, Zhengqiang Dong, Songkai Liu, Wei Xiong, Binxin Zhu, Lei Zhang, Yuehua Huang, and Xin Zhang
- Subjects
power systems ,fault recording ,Prony algorithm ,improved adaptive ,signal fitting ,General Works - Abstract
The fault of power systems introduces a severe challenge in terms of fault recording analysis, and the traditional Prony method cannot perform satisfactorily in the process of signal recordings fitting caused by faults. Therefore, an improved adaptive Prony algorithm is proposed in this article to study the characteristics of fault recordings. Specifically, the search step size is taken as an adaptive variable, and the mean square relative fitting error (MSRFE) is set as the criterion. Then, a large step is employed to rapidly determine an approximate segmentation point in the initial stage of the searching process, and its horizon is gradually reduced to establish an accurate subsegment point. Finally, the Prony algorithm is deployed to analyze the subsegment fitting original signal. The proposed approach has been simulated on an assumed fault signal, and the results validate the accuracy and efficiency of the method.
- Published
- 2022
- Full Text
- View/download PDF
12. Low-Voltage Stress Buck-Boost Converter With a High-Voltage Conversion Gain
- Author
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Binxin Zhu, Shishi Hu, Guanghui Liu, Yu Huang, and Xiaoli She
- Subjects
Buck-boost ,coat circuits ,high voltage conversion gain ,voltage stress ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
The conventional buck-boost converter has the advantages of simple structure, low cost, and the capability to achieve both voltage step-up and down. However, due to the negative impacts of the parasitic parameters of the device, the voltage conversion gain of the conventional buck-boost converter is greatly limited. A low-voltage stress buck-boost converter with a high voltage conversion gain based on a coat circuit is proposed in this paper to address the problem. Similar to a coat that can enhance human's resistance to cold weather, by adding the proposed coat circuit to the conventional buck-boost converter, not only the range for the voltage conversion can be extended, but also the voltage stresses of the semiconductor components are effectively reduced. In this work, comprehensive analysis on the working principles and performance characteristics of the coat converter are provided. Experimental results are obtained and analyzed to validate of the theoretical analysis based on a 300W closed-loop prototype platform.
- Published
- 2020
- Full Text
- View/download PDF
13. Coordinated Load Shedding Control Scheme for Recovering Frequency in Islanded Microgrids
- Author
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Can Wang, Shiyi Mei, Qingguo Dong, Ran Chen, and Binxin Zhu
- Subjects
Islanded microgrid ,double-q learning ,load shedding ,power deficit ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Supply and demand balance is required to assure the normal operation of microgrids. When unintentional islanding occurs in a microgrid, a load shedding (LS) control scheme is necessary to achieve the power balance and frequency stability of an islanded microgrid due to its limited power generation. However, the LS control of a microgrid faces two key challenges, i.e., how to determine the appropriate LS amount and LS objects in an islanded microgrid. To solve these problems, this paper proposes a coordinated LS control scheme based on Double-Q learning for an islanded microgrid. In the proposed coordinated LS control scheme, aiming at the LS amount problem in the process of unintentional islanding, this paper considers the relationship between the active power and frequency deviation of each distributed energy resource (DER) and uses the frequency deviation measured locally to calculate the LS amount and guide LS actions. Aiming at the problem of LS object selection in the process of unintentional islanding, this paper describes the LS control problem as a Markov decision process (MDP). The load priority is considered in a reward value function to ensure the uninterrupted power supply of critical loads in a microgrid. The two value functions of Double-Q learning are used to make the two Q value tables measure each other, which can reduce the overestimation of Q values and improve the accuracy of decision-making. The performance of the proposed coordinated LS control scheme is verified by a microgrid model based on a modified IEEE 13-bus system. The test results verify the feasibility and effectiveness of the proposed coordinated LS control scheme.
- Published
- 2020
- Full Text
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14. A Multi-Input-Port Bidirectional DC/DC Converter for DC Microgrid Energy Storage System Applications
- Author
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Binxin Zhu, Hui Hu, Hui Wang, and Yang Li
- Subjects
DC/DC converter ,multi-input-port ,bidirectional ,energy storage ,Technology - Abstract
A multi-input-port bidirectional DC/DC converter is proposed in this paper for the energy storage systems in DC microgrid. The converter can connect various energy storage batteries to the DC bus at the same time. The proposed converter also has the advantages of low switch voltage stress and high voltage conversion gain. The working principle and performance characteristics of the converter were analyzed in detail, and a 200 W, two-input-port experimental prototype was built. The experimental results are consistent with the theoretical analysis.
- Published
- 2020
- Full Text
- View/download PDF
15. A Generic Control-Oriented Model Order Reduction Approach for High Step-Up DC/DC Converters Based on Voltage Multiplier
- Author
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Binxin Zhu, Qingdian Zeng, Mahinda Vilathgamuwa, Yang Li, and Yao Chen
- Subjects
DC/DC converter ,reduced order model ,high step-up converter ,voltage multiplier (VM) ,control system design ,Technology - Abstract
The modeling and control system design of high step-up DC/DC converters based on voltage multipliers (VMs) are difficult, due to the various circuit topologies and the presence of large number of capacitors in VMs. This paper proposes a generic approach to reduce the model order of such converters by replacing the VM capacitors with voltage sources controlled by the output voltage of the converter. Theoretical analysis and simulation results show that the derived models can accurately represent the low frequency response of the converter which is valuable for obtaining a small-signal AC model for control system design. The detailed modeling and controller design process are demonstrated for the converter, and the obtained simulation results are verified experimentally on a 400 W prototype.
- Published
- 2019
- Full Text
- View/download PDF
16. Monitoring Chip Branch Failure in Multichip IGBT Modules Based on Gate Charge.
- Author
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Kaihong Wang, Pengju Sun, Binxin Zhu, Quanming Luo, and Xiong Du
- Published
- 2023
- Full Text
- View/download PDF
17. An empirical analysis of vulnerability information disclosure impact on patch R&D of software vendors.
- Author
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Qiang Xiong, Shuai Lian, Zhangying Zeng, Runxin He, Binxin Zhu, and Xinqi Yang
- Published
- 2023
- Full Text
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18. Underfrequency Load Shedding Scheme for Islanded Microgrids Considering Objective and Subjective Weight of Loads.
- Author
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Can Wang 0008, Sihu Chu, Yuchen Ying, Aoqi Wang, Ran Chen, Hengshan Xu, and Binxin Zhu
- Published
- 2023
- Full Text
- View/download PDF
19. Intelligent Data-Driven Decision-Making Method for Dynamic Multisequence: An E-Seq2Seq-Based SCUC Expert System.
- Author
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Nan Yang, Cong Yang, Lei Wu 0004, Xun Shen, Junjie Jia, Zhengmao Li, Daojun Chen, Binxin Zhu, and Songkai Liu
- Published
- 2022
- Full Text
- View/download PDF
20. Influence of domain experience on icon recognition and preferences.
- Author
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Junyi Xie, Divya Unnikrishnan, Leon Williams, Adriana Encinas-Oropesa, Srikanth Mutnuri, Nitin Sharma, Paul Jeffrey, Binxin Zhu, and Paul Lighterness
- Published
- 2022
- Full Text
- View/download PDF
21. Optimal Operation of Microgrids Based on a Radial Basis Function Metamodel.
- Author
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Can Wang 0008, Aoqi Wang, Sirui Chen, Gaorui Zhang, and Binxin Zhu
- Published
- 2022
- Full Text
- View/download PDF
22. Impact of Crowdsourcee's Vertical Fairness Concern on the Crowdsourcing Knowledge Sharing Behavior and Its Incentive Mechanism.
- Author
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Binxin Zhu, Leon Williams, Paul Lighterness, and Peng Gao
- Published
- 2021
- Full Text
- View/download PDF
23. A Family of Bipolar High Step-Up Zeta–Buck–Boost Converter Based on 'Coat Circuit'
- Author
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BinXin Zhu, Yu Liu, Shubo Zhi, Kaihong Wang, and Jiaxin Liu
- Subjects
Electrical and Electronic Engineering - Published
- 2023
24. Intelligent Data-Driven Decision-Making Method for Dynamic Multisequence: An E-Seq2Seq-Based SCUC Expert System
- Author
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Zhengmao Li, Daojun Chen, Xun Shen, Nan Yang, Junjie Jia, Lei Wu, Songkai Liu, Cong Yang, and Binxin Zhu
- Subjects
Sequence ,Basis (linear algebra) ,SIMPLE (military communications protocol) ,business.industry ,Computer science ,Deep learning ,Construct (python library) ,computer.software_genre ,Expert system ,Computer Science Applications ,Data-driven ,Power system simulation ,Control and Systems Engineering ,Artificial intelligence ,Data mining ,Electrical and Electronic Engineering ,business ,computer ,Information Systems - Abstract
An expanded sequence-to-sequence (E- Seq2Seq) based data-driven security-constrained unit commitment (SCUC) expert system for dynamic multiple-sequence mapping samples is proposed in this paper. First,the dynamic multiple-sequence mapping samples of SCUC are reconstructed by analyzing the input-output sequence characteristics. Then,an E-Seq2Seq approach with a multiple-encoder-decoder architecture and a fully connected extension layer is proposed. On this basis,the simple recurrent unit is introduced as a neuron of the E-Seq2Seq approach to construct the deep learning model,and an intelligent data-driven expert system for SCUC is further developed. The proposed approach has been simulated on a typical IEEE 118-bus system and a practical system from Hunan province in China. The results indicate that the proposed approach possesses strong generality,high solution accuracy,and efficiency over traditional methods.
- Published
- 2022
25. Fault-tolerance wide voltage conversion gain DC/DC converter for more electric aircraft
- Author
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Binxin ZHU, Jiaxin LIU, Yu LIU, and Kaihong WANG
- Subjects
Mechanical Engineering ,Aerospace Engineering - Published
- 2023
26. On Nonlinear Dynamic Characteristics of Peak-Current-Mode Controlled DC–DC Boost Converters with Fractional-Order Output Filtering Capacitor
- Author
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Xi Chen, Feng Zheng, Chao Yang, Hui Ma, and Binxin Zhu
- Subjects
electrical_electronic_engineering - Abstract
The concepts of fractional calculus and the related techniques have been gaining momentum in circuit system fields, and an increasing body of evidence suggests that fractional-order characteristics are widely distributed in electronic components. In this paper, we consider the fractional characteristics of non-solid aluminum electrolytic capacitors and focus on the nonlinear dynamic characteristics of peak-current-mode controlled (PCMC) dc-dc boost converters with such components. In the work, we establish a piecewise smooth non-commensurate fractional-order model to describe the converter, in which the fractional-order equivalent impedance model of capacitors is adopted and the detailed control loop is considered. In order to analyze the converter, we use the fractional Adams-Bashforth-Moulton typed method (F-ABM) and stroboscopic map technique to obtain the time-domain solutions and the bifurcation diagram. The results of bifurcation diagrams indicate that, with the change of different parameters, the converter enters chaotic state through period doubling bifurcation. In order to provide empirical evidence for the nonlinear dynamic analysis, we consider both circuit-level simulation and experiments in the work, the results of which further confirm the results of theoretical analysis.
- Published
- 2023
27. Buck-Based Active-Clamp Circuit for Current-Fed Isolated DC–DC Converters
- Author
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Chen Shihuan, Zhang Yao, Binxin Zhu, and Huihui Wang
- Subjects
Hardware_MEMORYSTRUCTURES ,business.industry ,Computer science ,Electrical engineering ,Process (computing) ,Hardware_PERFORMANCEANDRELIABILITY ,Converters ,Inductor ,law.invention ,law ,Hardware_INTEGRATEDCIRCUITS ,Voltage spike ,Voltage source ,Electrical and Electronic Engineering ,Transformer ,business ,Energy (signal processing) ,Hardware_LOGICDESIGN ,Leakage (electronics) - Abstract
In this paper, a buck based active-clamp circuit for current-fed isolated DC-DC converters is proposed. The proposed active-clamp circuit can not only suppress the voltage spikes caused by the current difference between the current-fed inductor and leakage inductor of the transformer, but also transfer the energy of the above process to the input voltage source. Different from the traditional active-clamp circuit, the proposed active-clamp circuit needs only one switch regardless of the number of input phases in the main circuit. Moreover, the control of the proposed active-clamp circuit is decoupled with the main circuit, which makes the design and implementation of the system controller easier. A 400W experimental prototype has been built to verify the effectiveness of the proposed circuit.
- Published
- 2022
28. Deep learning‐based SCUC decision‐making: An intelligent data‐driven approach with self‐learning capabilities
- Author
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Daojun Chen, Lei Zhang, Chao Xing, Yuehua Huang, Di Ye, Nan Yang, Junjie Jia, Xun Shen, Cong Yang, and Binxin Zhu
- Subjects
TK1001-1841 ,Distribution or transmission of electric power ,Computer science ,business.industry ,Deep learning ,Energy Engineering and Power Technology ,TK3001-3521 ,Machine learning ,computer.software_genre ,Data-driven ,Production of electric energy or power. Powerplants. Central stations ,Control and Systems Engineering ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,computer - Abstract
This paper proposes an intelligent Deep Learning (DL) based approach for Data‐Driven Security‐Constrained Unit Commitment (DD‐SCUC) decision‐making. The proposed approach includes data pre‐processing and a two‐stage decision‐making process. Firstly, historical data is accumulated and pre‐processed. Then, the DD‐SCUC model is created based on the Gated Recurrent Unit‐Neural Network (GRU‐NN). The mapping model between system daily load and decision results is created by training the DL model with historical data and then is utilized to make SCUC decisions. The two‐stage decision‐making process outputs the decision results based on various applications and scenarios. This approach has self‐learning capabilities because the accumulation of historical data sets can revise the mapping model and therefore improve its accuracy. Simulation results from the IEEE 118‐bus test system and a real power system from China showed that compared with deterministic Physical‐Model‐Driven (PMD)‐SCUC methods, the approach has higher accuracy, better efficiency in the practical use case, and better adaptability to different types of SCUC problems.
- Published
- 2022
29. A Novel High Step-up Converter for Photovoltaic Systems
- Author
-
Yu Liu, Binxin Zhu, Don Mahinda Vilathgamuwa, Jiaxin Liu, and Shubo Zhi
- Published
- 2022
30. Single-Switch High Step-Up Zeta Converter Based on Coat Circuit
- Author
-
Yu Huang, Zhang Yao, Guanghui Liu, Binxin Zhu, and Hu Shishi
- Subjects
single-switch ,Materials science ,General Computer Science ,high voltage gain ,Inductor ,law.invention ,law ,General Materials Science ,low voltage stress ,Electronic circuit ,business.industry ,General Engineering ,Electrical engineering ,Semiconductor device ,Converters ,TK1-9971 ,Capacitor ,Duty cycle ,visual_art ,Electronic component ,visual_art.visual_art_medium ,Zeta converter ,dc-dc converter ,Electrical engineering. Electronics. Nuclear engineering ,business ,Voltage - Abstract
By the negative influence of parasitic parameters from the components, the voltage step-up capacity of basic dc-dc converters is limited at extremely high duty cycle. Which makes the traditional dc-dc converters are difficult to be applied to renewable energy generation systems such as fuel cell and photovoltaic (PV) systems. In this study, a single-switch high step-up Zeta converter is proposed based on the basic Zeta converter and corresponding coat circuit. By using the coat circuit, the proposed converter not only can achieve higher voltage gain, but also acquire lower voltage stress on the semiconductor devices. Therefore, the devices with lower conduction resistances can be used to improve the efficiency. Furthermore, the coat circuit is composed of passive components, which does not change the continuous output current characteristic of the basic Zeta converter. And the proposed converter has only one active switch, the drive and control circuits are simple. The operation principle and the performance analysis of the proposed Zeta converter are described in detail, and a 300 W closed-loop experimental prototype has been developed for verification.
- Published
- 2021
31. Emergency Load Shedding Strategy for Microgrids Based on Dueling Deep Q-Learning
- Author
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Yu Hongliang, Binxin Zhu, Huikang Liu, Lin Chai, and Can Wang
- Subjects
frequency adjustment effect ,Microgrid ,General Computer Science ,Computer science ,020209 energy ,020208 electrical & electronic engineering ,General Engineering ,Load Shedding ,Q-learning ,02 engineering and technology ,Power (physics) ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,emergency load shedding ,General Materials Science ,deep Q-learning ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,lcsh:TK1-9971 ,frequency recovery - Abstract
The rapid drop of frequency under the disturbance is a major threat to the safe and stable operation of a microgrid (MG) system. Emergency load shedding is the main measure to prevent continuous frequency drop and power outage. The existing load shedding strategies have poor adaptability to deal with the problem of MG load shedding under different disturbance situations, and it is difficult to ensure the safe and stable operation of an MG in different operating environments. To address this problem, this paper proposes a data-driven load shedding strategy. First, considering the importance of the load and the frequency recovery time of the system, a load shedding contribution indicator is designed that takes into account the load frequency adjustment effect and the load shedding priority. This contribution indicator is introduced as a load shedding criterion into the reward value function of dueling deep Q learning. Second, considering the suddenness and uncertainty of emergency load shedding, a MG emergency load shedding strategy (ELSS) based on dueling deep Q-learning is proposed. On this basis, the dueling deep Q learning algorithm is used to obtain the load shedding decision with the maximum cumulative reward. Finally, taking the MG load shedding cases in two different scenarios as examples, a simulation study is carried out on a modified IEEE-25 bus MG. The simulation results show that, compared with the model-driven implicit enumeration strategy (IES), the proposed ELSS has superiority in maintaining stable power supply for important loads and reducing load shedding decision-making time and frequency fluctuations.
- Published
- 2021
32. An Interleaved Zero-Voltage Zero-Current Switching High Step-Up DC-DC Converter
- Author
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Yu Huang, Chen Shihuan, Binxin Zhu, and Zhang Yao
- Subjects
General Computer Science ,Interleaved ,Computer science ,Topology (electrical circuits) ,02 engineering and technology ,Inductor ,law.invention ,passive snubber circuit ,law ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Snubber ,General Materials Science ,Diode ,020208 electrical & electronic engineering ,General Engineering ,High voltage ,high step-up ,Power (physics) ,ZVZCS ,Capacitor ,high efficiency ,Photovoltaic power generation ,020201 artificial intelligence & image processing ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,lcsh:TK1-9971 ,Voltage - Abstract
An interleaved zero-voltage zero-current switching (ZVZCS) high step-up DC-DC converter is proposed for modern photovoltaic power generation systems. The proposed converter can achieve high voltage conversion gain without operating under extreme duty cycles. The voltage conversion gain can be readily adjusted by selecting different numbers of the diode-capacitor multiplier (DCM) cells in the circuit at the design stage. Moreover, with the passive snubber circuit in the proposed converter, all power switches and diodes in the DCMs can achieve zero-voltage turn-off and zero-current turn-on, which effectively reduces switching losses and increases the overall converter efficiency. The operational principles and analysis of the performance analysis with two DCMs are presented for demonstrative purpose. The effectiveness of the proposed ZVZCS DC-DC converter is validated using an 800W experimental prototype.
- Published
- 2021
33. Impact of Crowdsourcee’s Vertical Fairness Concern on the Crowdsourcing Knowledge Sharing Behavior and Its Incentive Mechanism
- Author
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Binxin Zhu, Williams Leon, Peng Gao, and Lighterness Paul
- Subjects
0209 industrial biotechnology ,business.industry ,Creative crowdsourcing community ,02 engineering and technology ,Environmental economics ,Crowdsourcing ,Knowledge sharing ,Cost reduction ,vertical fairness concern ,020901 industrial engineering & automation ,Incentive ,0202 electrical engineering, electronic engineering, information engineering ,Computer Science (miscellaneous) ,incentive mechanism ,Revenue ,020201 artificial intelligence & image processing ,Performance improvement ,knowledge sharing ,business ,Game theory ,Mechanism (sociology) ,Information Systems - Abstract
This paper examines in detail the impact of the crowdsourcee’s vertical fairness concern on the knowledge sharing incentive mechanism in crowdsourcing communities. The conditions for the establishment of the incentive mechanism are analyzed and the impact of fairness concern sensitivity on expected economic revenues of both sides as well as the crowdsourcing project performance is studied by game theory and computer simulation. The results show that the knowledge sharing incentive mechanism can only be established if the ratio between the performance improvement rate and the private cost reduction rate caused by shared knowledge is within a certain range. The degree of the optimal linear incentives, the private solution efforts, and the improvement of knowledge sharing level are positively correlated with the sensitivity of vertical fairness concern. In the non-incentive mode, the ratio between the performance conversion rate of private solution effort and the performance conversion rate of knowledge sharing effort plays an important role in moderating a crowdsourcing project’s performance. The authors find that the number of participants is either conducive or non-conducive to the improvement of performance. The implementation of knowledge sharing incentive can achieve a win-win situation for both the crowdsourcer and the crowdsourcee.
- Published
- 2020
34. Load Power Oriented Large-Signal Stability Analysis of Dual-Stage Cascaded dc Systems Based on Lyapunov-Type Mixed Potential Theory
- Author
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Binxin Zhu, Zhe Chen, Xi Chen, Hui Ma, and Feng Zheng
- Subjects
Computer Networks and Communications ,Hardware and Architecture ,Control and Systems Engineering ,Signal Processing ,Electrical and Electronic Engineering ,dual-stage cascaded dc-dc systems ,constant power loads (CPLs) ,large-signal stability analysis ,discrete-mapping model ,mixed potential theory - Abstract
Dual-stage cascaded dc systems are some of the most widely applied power interfaces in dc distributed power systems. However, in some practical situations, these systems might be unstable, especially if they incorporate tightly regulated load converters that operate as constant power loads (CPLs), whose power fluctuations could exert a cascading impact on the operation of the systems. Existing studies tend to describe the instability phenomena using bifurcation diagram analysis and the loci of eigenvalue analysis. However, it is usually difficult to derive the explicit expressions of the stability criterion. This paper addresses the large-signal stability issue of the dual-stage cascaded dc systems from a standpoint of load power and obtains the explicit form large-signal stability boundary in terms of load power by using Lyapunov-type mixed potential theory. Moreover, the prototype dual-stage cascaded dc system, in which the control strategies for the feeder converter and the load converter are different, is used as an example in this study. According to the results, the system remains stable when the load power is in [5.8, 23.2] W. When load power is less than 5.8 W or increased to [23.2, 32.8] W, the system is in a period-2 subharmonic oscillation state. Moreover, when the load power exceeds 32.8 W, the system falls into a chaotic state. The deduced boundary is highly consistent with the analysis results of both a bifurcation diagram and Jacobian matrix based analysis. Finally, both circuit-level simulation and experimental results validate the effectiveness of the load power stability boundary.
- Published
- 2022
35. Multiple Input-Terminal Voltage Multiplier Circuit
- Author
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Chen Yao, Zihao Wei, Han Wang, D. Mahinda Vilathgamuwa, and Binxin Zhu
- Subjects
Optimal design ,Computer science ,020209 energy ,020208 electrical & electronic engineering ,Topology (electrical circuits) ,02 engineering and technology ,Semiconductor device ,Converters ,Industrial and Manufacturing Engineering ,Analog multiplier ,law.invention ,Capacitor ,Control and Systems Engineering ,law ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Electrical and Electronic Engineering ,Electronic circuit ,Voltage - Abstract
Voltage multipliers (VMs) are widely used in applications with the high-voltage-gain rectifiers and dc/dc converters with the capability of increasing voltage conversion ratio. Currently, all the existing VM circuits are designed with two input terminals, while the optimal design on the voltage conversion ratio and voltage stress on the semiconductor devices of the converters with VMs can be achieved by varying the number of basic VM units. However, as the number of its input terminals is fixed and, thus, the current stress on the semiconductor devices are not adjustable at the design stage, such circuits have limited applications in today's high-power energy conversion systems. In order to address such drawbacks of the conventional VMs, a multiple input-terminal VM (MIVM) circuit is proposed in this article. The analysis of the operation principles and the performance characteristics of the proposed MIVM circuit are presented in detail. As an example, the application of the MIVM with the traditional boost converters is presented and discussed, and the efficacy of the theoretical analysis is validated experimentally.
- Published
- 2020
36. Influence of domain experience on icon recognition and preferences
- Author
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Paul Jeffrey, Leon Williams, A. Encinas-Oropesa, Junyi Xie, Binxin Zhu, Nitin Sharma, Divya Unnikrishnan, Paul Lighterness, and Srikanth Mutnuri
- Subjects
Complex data type ,Interface (Java) ,Computer science ,business.industry ,05 social sciences ,General Social Sciences ,02 engineering and technology ,Domain (software engineering) ,Human-Computer Interaction ,Arts and Humanities (miscellaneous) ,Human–computer interaction ,020204 information systems ,0502 economics and business ,0202 electrical engineering, electronic engineering, information engineering ,Developmental and Educational Psychology ,050211 marketing ,Icon ,Internet of Things ,business ,Wireless sensor network ,computer ,computer.programming_language - Abstract
With the advance of the Internet of Things (IoT) and smart sensor networks, accurate understanding of complex data via interface icons is critical for effective decision making, operation managemen...
- Published
- 2020
37. Coat Circuits for DC–DC Converters to Improve Voltage Conversion Ratio
- Author
-
Binxin Zhu, Feng Ding, and D.M. Vilathgamuwa
- Subjects
Materials science ,business.industry ,020208 electrical & electronic engineering ,Ćuk converter ,Electrical engineering ,Topology (electrical circuits) ,Hardware_PERFORMANCEANDRELIABILITY ,02 engineering and technology ,Converters ,Inductor ,law.invention ,Capacitor ,law ,Power electronics ,Hardware_INTEGRATEDCIRCUITS ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,business ,Electronic circuit ,Voltage - Abstract
The voltage conversion ratio of basic dc/dc converters is limited due to the influence of parasitic elements of circuits and components. In this article, a family of passive circuits termed as “coat circuits” are proposed for conventional dc/dc converters. Not only voltage step-up capacity can be improved but also the voltage stress of components can be decreased by adding coat circuits to basic dc/dc converters. Moreover, no additional active switches are needed in the coat circuits, that means the control and driver circuits of the converters are not changed. The Cuk converter with the coat circuit has been analyzed as an example, and a 200 W experimental prototype has been built to verify the validity of the theoretical analysis.
- Published
- 2020
38. Coordinated Load Shedding Control Scheme for Recovering Frequency in Islanded Microgrids
- Author
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Binxin Zhu, Qingguo Dong, Shiyi Mei, Can Wang, and Ran Chen
- Subjects
General Computer Science ,Computer science ,business.industry ,Islanded microgrid ,General Engineering ,load shedding ,Frequency deviation ,AC power ,Power (physics) ,power deficit ,Electricity generation ,Control theory ,Distributed generation ,double-q learning ,Islanding ,General Materials Science ,Microgrid ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,Electrical and Electronic Engineering ,business ,lcsh:TK1-9971 - Abstract
Supply and demand balance is required to assure the normal operation of microgrids. When unintentional islanding occurs in a microgrid, a load shedding (LS) control scheme is necessary to achieve the power balance and frequency stability of an islanded microgrid due to its limited power generation. However, the LS control of a microgrid faces two key challenges, i.e., how to determine the appropriate LS amount and LS objects in an islanded microgrid. To solve these problems, this paper proposes a coordinated LS control scheme based on Double-Q learning for an islanded microgrid. In the proposed coordinated LS control scheme, aiming at the LS amount problem in the process of unintentional islanding, this paper considers the relationship between the active power and frequency deviation of each distributed energy resource (DER) and uses the frequency deviation measured locally to calculate the LS amount and guide LS actions. Aiming at the problem of LS object selection in the process of unintentional islanding, this paper describes the LS control problem as a Markov decision process (MDP). The load priority is considered in a reward value function to ensure the uninterrupted power supply of critical loads in a microgrid. The two value functions of Double-Q learning are used to make the two Q value tables measure each other, which can reduce the overestimation of Q values and improve the accuracy of decision-making. The performance of the proposed coordinated LS control scheme is verified by a microgrid model based on a modified IEEE 13-bus system. The test results verify the feasibility and effectiveness of the proposed coordinated LS control scheme.
- Published
- 2020
39. Low-Voltage Stress Buck-Boost Converter With a High-Voltage Conversion Gain
- Author
-
Yu Huang, She Xiaoli, Hu Shishi, Guanghui Liu, and Binxin Zhu
- Subjects
coat circuits ,voltage stress ,Materials science ,General Computer Science ,020209 energy ,020208 electrical & electronic engineering ,General Engineering ,Buck–boost converter ,02 engineering and technology ,Inductor ,law.invention ,Stress (mechanics) ,Capacitor ,Work (electrical) ,law ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Equivalent circuit ,General Materials Science ,Buck-boost ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,high voltage conversion gain ,Low voltage ,lcsh:TK1-9971 ,Voltage - Abstract
The conventional buck-boost converter has the advantages of simple structure, low cost, and the capability to achieve both voltage step-up and down. However, due to the negative impacts of the parasitic parameters of the device, the voltage conversion gain of the conventional buck-boost converter is greatly limited. A low-voltage stress buck-boost converter with a high voltage conversion gain based on a coat circuit is proposed in this paper to address the problem. Similar to a coat that can enhance human’s resistance to cold weather, by adding the proposed coat circuit to the conventional buck-boost converter, not only the range for the voltage conversion can be extended, but also the voltage stresses of the semiconductor components are effectively reduced. In this work, comprehensive analysis on the working principles and performance characteristics of the coat converter are provided. Experimental results are obtained and analyzed to validate of the theoretical analysis based on a 300W closed-loop prototype platform.
- Published
- 2020
40. Single‐switch high step‐up boost converter based on a novel voltage multiplier
- Author
-
Binxin Zhu, D.M. Vilathgamuwa, and Han Wang
- Subjects
business.industry ,Computer science ,020209 energy ,020208 electrical & electronic engineering ,Electrical engineering ,02 engineering and technology ,Semiconductor device ,Stress (mechanics) ,Boost converter ,0202 electrical engineering, electronic engineering, information engineering ,Voltage multiplier ,Electrical and Electronic Engineering ,business ,Voltage ,Electronic circuit - Abstract
A single-switch high step-up boost converter based on a novel voltage multiplier (VM) has been proposed in this study. Compared to traditional boost converter, not only the voltage conversion ratio has been increased, but also voltage stress across semiconductor devices has been decreased. Moreover, the voltage conversion ratio and voltage stress of switch of the proposed converter can be adjusted by the number of the VM cells. The control and drive circuits for the proposed converter is as simple as boost converter as there are no additional switches. Working principles and performance characteristics of the proposed converter have been analysed in detail. A 200 W experimental prototype with three VMs has been built to validate the theoretical analysis.
- Published
- 2019
41. Collaborative Innovation Network, Knowledge Base, and Technological Innovation Performance-Thinking in Response to COVID-19
- Author
-
Jialu, Su, primary, Zhiqiang, Ma, additional, Binxin, Zhu, additional, Haoyang, Xie, additional, Fredrick Oteng, Agyeman, additional, and Hu, Weijun, additional
- Published
- 2021
- Full Text
- View/download PDF
42. High step‐up SVMC‐based DC/DC converter for offshore wind farms
- Author
-
Binxin Zhu, Liu Song, Yang Li, and D.M. Vilathgamuwa
- Subjects
Wind power ,business.industry ,Computer science ,020209 energy ,020208 electrical & electronic engineering ,Phase (waves) ,Electrical engineering ,02 engineering and technology ,Converters ,Stress (mechanics) ,Offshore wind power ,Power electronics ,Scalability ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,business ,Voltage - Abstract
This study presents a high step-up scalable voltage multiple cell (SVMC)-based DC/DC converters, which have the features of high gain, low and adjustable components stresses and automatic input-current sharing in each input phase. In virtue of the above features, the converter is applicable for the DC collection grids for offshore wind farms. In this study, the converter in terms of working principle and property characteristics are analysed with four input phases and three SVMCs. The converter has also been evaluated in terms of the component stress and voltage conversion ratio against some other converters for high-power occasions. Moreover, a 2.5 MW simulation model and a 1.2 kW prototype were constructed for verification.
- Published
- 2019
43. A Dual-Input High Step-Up DC/DC Converter With ZVT Auxiliary Circuit
- Author
-
Liu Song, Chen Yao, Binxin Zhu, Zeng Qingdian, and Zhao Yuhui
- Subjects
Maximum power principle ,Computer science ,020208 electrical & electronic engineering ,Photovoltaic system ,Energy Engineering and Power Technology ,Topology (electrical circuits) ,02 engineering and technology ,Inductor ,Maximum power point tracking ,Power (physics) ,law.invention ,Capacitor ,Control theory ,law ,visual_art ,Electronic component ,0202 electrical engineering, electronic engineering, information engineering ,visual_art.visual_art_medium ,Electrical and Electronic Engineering - Abstract
A dual-input high step-up DC/DC converter with zero voltage turn-off (ZVT) auxiliary circuit is presented in this paper. The cost of whole photovoltaic (PV) power could be decreased significantly by the proposed converter because it allows two PV panels to be connected at the same time. ZVT auxiliary circuit provides soft switching in a wide range of load variations with six passive components. Turn-off switching losses could be decreased and the efficiency of the whole converter could be improved. In Section II , the operation principle and performance characteristics of the proposed converter have been analyzed and an 800 W experimental prototype has been built to validate the analytical results in Section III . In Section IV , a dual-input maximum power point tracking (DMPPT) control algorithm has been designed for the proposed converter. Experimental results show that two PV panels can achieve the maximum power output state separately by the proposed DMPPT control algorithm.
- Published
- 2019
44. A multi-agent game based joint planning approach for electricity-gas integrated energy systems considering wind power uncertainty
- Author
-
Yuehua Huang, Lei Wu, Chao Xing, Tao Qin, Binxin Zhu, Nan Yang, Huang Yu, and Zhang Lei
- Subjects
Wind power ,Operations research ,business.industry ,Computer science ,Energy Engineering and Power Technology ,Joint (building) ,Game based ,Electricity ,Planning approach ,Electrical and Electronic Engineering ,business ,Energy (signal processing) - Published
- 2022
45. A Multi-operating Mode Multi-port DC/DC Converter with High Step-up Voltage Gain
- Author
-
Shishi Hu, Binxin Zhu, Huang Yang, and Hui Wang
- Subjects
Power rating ,Computer science ,business.industry ,Mode (statistics) ,Electrical engineering ,business ,Port (computer networking) ,Low voltage ,Energy storage ,Voltage ,Power (physics) ,Renewable energy - Abstract
Aiming at renewable energy generation system with storage elements. A multi-operating mode and multi-port DC/DC converter with high step-up voltage gain has been presented in this paper, the proposed converter interfaces a unidirectional input power port, a bidirectional port for storage elements and a load port into a unified structure, which features single stage power conversion among any two electrical ports. It has the advantages of high step-up voltage gain, smoothly switching between any working modes and low voltage stress on switching devices. The working principles of the converter were analyzed in this paper, and then the performances and characteristics of the converter were deduced. Finally, an experimental prototype with a rated power of 200W was set up to verify the theoretical analysis.
- Published
- 2020
46. An Improved Constrained Order Optimization Algorithm for Uncertain SCUC Problem Solving
- Author
-
Nan Yang, Junjie Jia, Huang Yuehua, Binxin Zhu, Songkai Liu, Chao Xing, and Haoze Chen
- Subjects
Mathematical optimization ,Control and Optimization ,Wind power ,Renewable Energy, Sustainability and the Environment ,business.industry ,Computer science ,020209 energy ,05 social sciences ,050301 education ,Energy Engineering and Power Technology ,security-constrained unit commitment ,data-driven ,discrete variable identification ,invalid effective safety constraint identification ,improved constraint order optimization ,02 engineering and technology ,Power (physics) ,Constraint (information theory) ,Electric power system ,Identification (information) ,Power system simulation ,Order (exchange) ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,business ,0503 education ,Engineering (miscellaneous) ,Energy (miscellaneous) - Abstract
Studying the faster and more efficient method of solving the uncertain security-constrained unit commitment (SCUC) problem is an urgent need for the development of power systems under the background of large-scale wind power access and power dispatching. This study proposes an improved constrained order optimization (COO) algorithm to solve the uncertain SCUC problem. First, the data-driven discrete variable identification strategy is incorporated into the COO rough model, and then, the invalid security constraints identification strategy is incorporated into the COO accurate model. Finally, the improved COO algorithm combines the discrete variable identification with the invalid security constraint identification to make the uncertain SCUC decision. The results of the IEEE 118-bus test system showed that, compared with the traditional COO algorithm, the improved COO algorithm proposed has higher accuracy and better efficiency.
- Published
- 2019
- Full Text
- View/download PDF
47. Survey of Frequency Response Analysis on Winding Deformation of Transformers
- Author
-
Tao Zhang, Zhenhua Li, Binxin Zhu, Yufei Luo, Zhi Zhang, and Zhang Yangpo
- Subjects
010302 applied physics ,0209 industrial biotechnology ,Frequency response ,Frequency response analysis ,Computer science ,Test equipment ,Comparability ,02 engineering and technology ,01 natural sciences ,law.invention ,Electric power system ,020901 industrial engineering & automation ,law ,Electromagnetic coil ,0103 physical sciences ,Electronic engineering ,Power grid ,Transformer - Abstract
As a core equipment in power system, power transformer plays a vital role in the stability of the power grid. It is necessary to quickly and accurately monitor the fault of the transformer. Frequency response method is an important method for fault diagnosis of transformers. It has many advantages, such as simple and light test equipment, easy measurement and high test sensitivity, intuitive analysis of experimental maps, and comparability of data magnitude analysis. It is considered to be a detection method with good application prospects. In this paper, the monitoring principle of frequency response method and the influencing factors in practical application are analyzed, and the shortcomings of the method and the research direction of the next step are prospected.
- Published
- 2019
48. High Power High Step-up DC/DC Converter Based on Multiple Input-Terminal Voltage Multiplier
- Author
-
Binxin Zhu, Chen Yao, Mahinda Vilathgamuwa, and Han Wang
- Subjects
Computer science ,business.industry ,020209 energy ,020208 electrical & electronic engineering ,Electrical engineering ,High voltage ,02 engineering and technology ,Converters ,Inductor ,law.invention ,Capacitor ,Power rating ,law ,0202 electrical engineering, electronic engineering, information engineering ,Voltage multiplier ,Multiplier (economics) ,business ,Voltage - Abstract
Voltage multipliers (VMs) are widely used to combine with traditional DC/DC converter to achieve high voltage conversion gain. However, the input-terminals of existing VM circuits are unchangeable to two which make these converters are not suitable for high power/current applications. In this paper, a high power high step-up DC/DC converter based on multiple input-terminal voltage multiplier (MIVM) is presented. Analysis of the operation principles and the performance characteristics of the proposed converter are presented in detail. And an experimental prototype with a rated power of 800W was built to verify the correctness of the theory.
- Published
- 2019
49. Do Real Life Visuals Help Students to Learn Engineering
- Author
-
Negareh Ghasemi, Ghavameddin Nourbakhsh, Wendy Miller, Binxin Zhu, Aaron Liu, and Gerard Ledwich
- Subjects
Class (computer programming) ,05 social sciences ,Professional development ,010501 environmental sciences ,Grid ,01 natural sciences ,Visual arts ,Blended learning ,Authentic learning ,Engineering education ,0502 economics and business ,Technical university ,Curriculum ,050203 business & management ,0105 earth and related environmental sciences - Abstract
Learning engineering can be challenging with concepts interwoven with mathematics. When new academics start teaching a class, existing materials are often utilized without due consideration of the changing world and the utilization of new technology to improve teaching material. A new 3R model (Relate, Re-image, Re-design) is developed to redesign engineering tutorials with real world visuals. This model has been implemented for three continuous years to a similar cohort of third year undergraduate electrical engineering students in a leading technical university in Australia. With the model, real life visuals have been incorporated, e.g. building rooftop solar systems, technical challenges to customers and grid. Its impact has been anonymously evaluated with university off-class online surveys. Results show students’ understanding, confidence and engagement have been improved significantly. This model enhances engineering curriculum with blended and authentic learning experiences. It also assists in the professional development of new academics.
- Published
- 2019
50. Multiple Input-Terminal Voltage Multiplier Circuit
- Author
-
Binxin Zhu, Han Wang, Chen Yao, and Mahinda Vilathgamuwa
- Subjects
Flexibility (engineering) ,Computer science ,High voltage ,Hardware_PERFORMANCEANDRELIABILITY ,Converters ,Analog multiplier ,law.invention ,Capacitor ,Rectifier ,law ,Hardware_INTEGRATEDCIRCUITS ,Electronic engineering ,Voltage ,Electronic circuit - Abstract
Voltage multipliers (VMs) are widely used not only in high voltage gain rectifier applications but also some traditional dc/dc converters to improve voltage conversion ratio. However, as the fixed number of its input-terminals, it is hard to traditional VM circuits to make a balance between the voltage and current stress on capacitors. In order to address such drawback of traditional VMs, a multiple input-terminal VM (MIVM) circuit is presented in this paper. The design flexibility of the proposed MIVM is better than traditional VMs. Analysis of the operation principles and the performance characteristics of the proposed MIVM circuit are presented in detail. And the efficacy of the theoretical analysis is validated experimentally.
- Published
- 2019
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