16 results on '"optimal power distribution"'
Search Results
2. Route-Based Supervisory Controls
- Author
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Taghavipour, Amir, Vajedi, Mahyar, Azad, Nasser L., Grimble, Michael J., Series Editor, Goodwin, Graham C, Editorial board, Ferrara, Antonella, Series Editor, Harris, Thomas J., Editorial board, Lee, Tong Heng, Editorial board, Malik, Om P., Editorial board, Man, Kim-Fung, Editorial advisor, Olsson, Gustaf, Editorial board, Ray, Asok, Editorial advisor, Engell, Sebastian, Advisory Editor, Yamamoto, Ikuo, Editorial board, Taghavipour, Amir, Vajedi, Mahyar, and Azad, Nasser L.
- Published
- 2019
- Full Text
- View/download PDF
3. Research on Primary Frequency Regulation Control Strategy of Wind-thermal Power Coordination
- Author
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Peihong Yang, Xiaoling Dong, Ya Li, Li Kuang, Jihong Zhang, Bin He, and Yao Wang
- Subjects
Wind farm ,primary frequency regulation ,wind-thermal power coordination frequency regulation ,speed recovery control ,optimal power distribution ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
With the increase of wind power penetration in the electric grid, the frequency regulation method that simply reply on traditional power is gradually weakened. For this reason, the participation of wind power in system frequency regulation has become an inevitable trend in the operation of large-scale grid-connected power system. Focused on the essential difference of the frequency response speed between wind turbine and thermal power unit, a primary frequency regulation control strategy for large-scale wind power cooperative thermal power units is proposed to realize frequency regulation in the full wind speed range of doubly-fed wind turbines and improve the frequency response capability of large-scale wind power access to system. Firstly, the frequency regulation response strategy of wind turbine based on rotor kinetic energy control and power reserve control and the control strategy of rotor speed recovery are studied to improve the frequency regulation capability of wind power system. Secondly, the optimal distribution of frequency regulation power of the large-scale wind farms is realized according to the establishing of the power distribution strategy based on weight factor of each turbine in the wind farm in different operating scenarios Finally, the control framework of wind-thermal power coordination frequency regulation is constructed. The system power shortage is distributed to the wind farm and the thermal power unit in real time by the dispatch center according to the wind farms' and thermal power unit's operating states and the variation of system frequency, by which the wind-thermal power coordination frequency regulation of power system can be achieved. Simulation results of the 36-node test example demonstrate that the proposed strategy can effectively improve the frequency response capability and the frequency characteristics of the power system.
- Published
- 2019
- Full Text
- View/download PDF
4. Spoofing-Jamming Attack Strategy Using Optimal Power Distributions in Wireless Smart Grid Networks.
- Author
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Gai, Keke, Qiu, Meikang, Ming, Zhong, Zhao, Hui, and Qiu, Longfei
- Abstract
As an emerging fast-growing technology, smart grid networks (SGNs) have been dramatically accepted by the current power supply industry for achieving high performance power governance system. The wireless SGN (WSGNs) have enabled numerous flexible power management solutions without the restrictions of the wired infrastructure. The cognitive radio network (CRN) is one of the widely deployed wireless networking approaches. The communication security is a major concern while CRN is used in WSGNs. Currently, jamming and spoofing are two common attack approaches that are active in the deployment of WSGNs when using CRNs. This paper proposes an attack strategy, maximum attacking strategy using spoofing and jamming (MASS-SJ), which utilizes an optimal power distribution to maximize the adversarial effects. Spoofing and jamming attacks are launched in a dynamic manner in order to interfere with the maximum number of signal channels. Our proposed approach has been evaluated by our experiments and the results have shown the positive performance of using MAS-SJ. [ABSTRACT FROM PUBLISHER]
- Published
- 2017
- Full Text
- View/download PDF
5. Optimal Power Allocation for Maximum Throughput of General MU-MIMO Multiple Access Channels With Mixed Constraints.
- Author
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He, Peter and Zhao, Lian
- Subjects
- *
MIMO systems , *WIRELESS communications , *ANALYSIS of covariance , *COVARIANCE matrices , *TELECOMMUNICATION research - Abstract
Based on the efficient generalized water-filling with group peak power constraints (GWFGP), this paper proposes an iterative algorithm to compute the optimal solutions to system throughput (sum-rate) maximization problems. This class of problems is equipped with the multiuser multiple input multiple output multiple access channels (MU-MIMO MAC) in the general communication systems. The proposed iterative GWFGP algorithm (IGWFGP) has two levels of loops. The inner loop aims at computing the solution to each member in the family, while the outer loop aims at computing the solution to the target problem based on the results obtained by the inner loop. Both GWFGP and the convergence theory of an algorithm are used in the inner loop and the outer loop respectively. Furthermore, by exploiting the concept of variable weighting factor for covariance update, IGWFGP owns fast convergence and provides optimal solutions to the sum rate maximization problems. The usage of the convergence theory in IGWFGP and the algorithm of GWFGP are efficient and novel. To the best of the authors’ knowledge, no prior algorithm has been reported in the open literature to solve the targeted problem in this paper. In addition, the proposed algorithm does not require to choose the initial value for computation. This feature is a significant advantage of the algorithm, especially for large and complicated systems. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
6. Research on Primary Frequency Regulation Control Strategy of Wind-thermal Power Coordination
- Author
-
Li Kuang, Ya Li, Yao Wang, Zhang Jihong, Bin He, Xiaoling Dong, and Yang Peihong
- Subjects
Frequency response ,General Computer Science ,Computer science ,020209 energy ,Thermal power station ,02 engineering and technology ,optimal power distribution ,Turbine ,Automotive engineering ,Wind speed ,law.invention ,Wind farm ,Electric power system ,wind-thermal power coordination frequency regulation ,law ,Frequency regulation ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,primary frequency regulation ,Wind power ,Rotor (electric) ,business.industry ,020208 electrical & electronic engineering ,General Engineering ,speed recovery control ,Power (physics) ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,business ,lcsh:TK1-9971 - Abstract
With the increase of wind power penetration in the electric grid, the frequency regulation method that simply reply on traditional power is gradually weakened. For this reason, the participation of wind power in system frequency regulation has become an inevitable trend in the operation of large-scale grid-connected power system. Focused on the essential difference of the frequency response speed between wind turbine and thermal power unit, a primary frequency regulation control strategy for large-scale wind power cooperative thermal power units is proposed to realize frequency regulation in the full wind speed range of doubly-fed wind turbines and improve the frequency response capability of large-scale wind power access to system. Firstly, the frequency regulation response strategy of wind turbine based on rotor kinetic energy control and power reserve control and the control strategy of rotor speed recovery are studied to improve the frequency regulation capability of wind power system. Secondly, the optimal distribution of frequency regulation power of the large-scale wind farms is realized according to the establishing of the power distribution strategy based on weight factor of each turbine in the wind farm in different operating scenarios Finally, the control framework of wind-thermal power coordination frequency regulation is constructed. The system power shortage is distributed to the wind farm and the thermal power unit in real time by the dispatch center according to the wind farms' and thermal power unit's operating states and the variation of system frequency, by which the wind-thermal power coordination frequency regulation of power system can be achieved. Simulation results of the 36-node test example demonstrate that the proposed strategy can effectively improve the frequency response capability and the frequency characteristics of the power system.
- Published
- 2019
7. High-power CSI-fed induction motor drive with optimal power distribution based control.
- Author
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Kwak, S. -S.
- Subjects
- *
THYRISTOR converters , *INDUCTION motors , *ELECTRIC potential , *ELECTRIC inverters , *ELECTRIC power distribution , *CAPACITORS , *ELECTRIC currents - Abstract
In this article, a current source inverter (CSI) fed induction motor drive with an optimal power distribution control is proposed for high-power applications. The CSI-fed drive is configured with a six-step CSI along with a pulsewidth modulated voltage source inverter (PWM-VSI) and capacitors. Due to the PWM-VSI and the capacitor, sinusoidal motor currents and voltages with high quality as well as natural commutation of the six-step CSI can be obtained. Since this CSI-fed drive can deliver required output power through both the six-step CSI and PWM-VSI, this article shows that the kVA ratings of both the inverters can be reduced by proper real power distribution. The optimal power distribution under load requirements, based on power flow modelling of the CSI-fed drive, is proposed to not only minimise the PWM-VSI rating but also reduce the six-step CSI rating. The dc-link current control of the six-step CSI is developed to realise the optimal power distribution. Furthermore, a vector controlled drive for high-power induction motors is proposed based on the optimal power distribution. Experimental results verify the high-power CSI-fed drive with the optimal power distribution control. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
8. Spreading and power allocation for multiple antenna transmission using decorrelating receivers.
- Author
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Rajan, D., Erkip, E., and Behnaam Aazhang
- Abstract
We propose a new scheme for multiple antenna transmission in the context of spread-spectrum signaling. The new scheme consists of using shifted Gold sequences to modulate independent information on the multiple antennas. We show that this strategy of using multiphase spreading (MPS) on different antennas greatly improves the throughput over currently known spread-spectrum multiple-antenna methods. We also find the optimal power allocation strategy among multiple transmit antennas for a fixed rate of channel state information, which might be provided via a feedback link, at the transmitter. We demonstrate the differences in optimal power distribution for maximizing capacity and minimizing probability of outage. When the transmission from the two antennas uses orthogonal spreading, we find that optimizing the power does not give much gain over the equal power transmission. However, when the transmissions are not orthogonal as in the case of MPS, then allocating power to maximize throughput gives considerable gain over equal power transmission. We also consider the effect of imperfections in the feedback channel on the optimal power allocation and show that our power allocation scheme is robust to feedback errors. [ABSTRACT FROM PUBLISHER]
- Published
- 2003
- Full Text
- View/download PDF
9. Weighted sum-rate maximization for multi-user SIMO multiple access channels in cognitive radio networks
- Author
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He, Peter, Zhao, Lian, and Lu, Jianhua
- Published
- 2013
- Full Text
- View/download PDF
10. Optimum power control for transmitter cooperation in OFDMA based wireless networks
- Author
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Sezi Bakim, Onur Kaya, Işık Üniversitesi, Mühendislik Fakültesi, Elektrik-Elektronik Mühendisliği Bölümü, Işık University, Faculty of Engineering, Department of Electrical-Electronics Engineering, Bakım, İsmail Sezi, and Kaya, Onur
- Subjects
Transmitter cooperation ,Orthogonal frequency-division multiplexing ,Computer science ,Iterative methods ,Cooperative OFDMA system ,Orthogonal frequency-division multiple access ,Decoding ,OFDM modulation ,Optimal power distribution ,Fading channels ,Subgradient algorithm ,Radio transmitters ,Subcarrier ,Block Markov superposition encoding ,Telecommunications link ,Wireless networks ,Cooperative communication ,Channel code ,Wireless network ,Resource management ,Markov processes ,Transmitter ,Rate region boundary ,Full channel state information ,Vectors ,Channel coding ,Block codes ,Frequency division multiple access ,Optimal control ,Power control ,Decoding methods ,Uplink ,Block code ,Mathematical optimization ,Optimum power control ,Inter-subchannel cooperative encoding ,Data_CODINGANDINFORMATIONTHEORY ,Radio networks ,Fading ,Computer Science::Information Theory ,Optimal power allocation policy ,Frequency-division multiple access ,Resource-allocation ,Telecommunication control ,Systems ,Cooperative orthogonal frequency division multiple access system ,Transmitters ,Iterative waterfilling-like algorithm ,Channel state information ,Encoding - Abstract
For a cooperative orthogonal frequency division multiple access (OFDMA) system with two transmitters (TXs), and full channel state information (CSI), we obtain the optimal power allocation (PA) policies which maximize the rate region achievable by a recently introduced version of block Markov superposition encoding (BMSE): inter-subchannel cooperative encoding (ISCE) [1]. We provide the optimality conditions that need to be satisfied by the powers associated with the transmitted codewords. We propose two algorithms that yield the optimal power distribution: a subgradient algorithm which achieves an arbitrary rate point on the achievable rate region boundary, and an iterative waterfilling-like algorithm which maximizes the sum rate, and converges much faster. We observe that, utilization of power control to take advantage of the diversity offered by the cooperative OFDMA system, not only leads to a remarkable improvement in achievable rates, but also may help determine how the subchannels have to be instantaneously allocated to various tasks in cooperation. Publisher's Version
- Published
- 2011
11. Návrh optimalizace a spolupráce elektrárenských bloků
- Author
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Radil, Lukáš, Mastný, Petr, Hübková, Ivana, Radil, Lukáš, Mastný, Petr, and Hübková, Ivana
- Abstract
Tato bakalářská práce se zabývá tepelným oběhem kondenzačních tepelných elektráren a možnostmi zvyšování jejich účinnosti. Konkrétně zmiňuje zvyšování parametrů vstupní páry, zlepšení vakua v kondenzátoru, regenerační ohřev, přihřívání páry a také v neposlední řadě nadkritické parametry páry. Dále také ztráty v oběhu, výkonové bilance a měrné spotřeby. V další části se tato práce zabývá optimalizací provozu a spoluprácí dvou elektrárenských bloků. Na příkladu je ukázáno optimální rozdělení jejich výkonu při daném zatížení a jsou sestrojeny nákladové a spotřební charakteristiky těchto bloků. Nahlédneme do budoucnosti české energetiky, jak by asi bylo výhodné ekonomicky, ekologicky, ale hlavně technicky rozdělit výrobu elektrické energie., This bachelor´s thesis deals with heat circulation in condensing thermal power plants and the possibilities of increasing their effectiveness. Specifically it addresses several topics, namely: "increasing of inlet steam parameters, improving of vacuum in the condenser, regenerative heating, reheating of steam and, last but not least, the supercritical steam parameters." Furthermore, it also deals with losses in heat circulation, power balance and specific consumption. Another part of this thesis deals with optimization of operations and cooperation of two power plant units. A case study shows the optimal power division at load. The cost and consumption characteristics of these blocks are plotted. An insight into the future of Czech energetics is made, theorizing about the advantages of dividing electrical energy distribution, from the point of view of economy, environment, and primarily, technology.
12. Návrh optimalizace a spolupráce elektrárenských bloků
- Author
-
Radil, Lukáš, Mastný, Petr, Hübková, Ivana, Radil, Lukáš, Mastný, Petr, and Hübková, Ivana
- Abstract
Tato bakalářská práce se zabývá tepelným oběhem kondenzačních tepelných elektráren a možnostmi zvyšování jejich účinnosti. Konkrétně zmiňuje zvyšování parametrů vstupní páry, zlepšení vakua v kondenzátoru, regenerační ohřev, přihřívání páry a také v neposlední řadě nadkritické parametry páry. Dále také ztráty v oběhu, výkonové bilance a měrné spotřeby. V další části se tato práce zabývá optimalizací provozu a spoluprácí dvou elektrárenských bloků. Na příkladu je ukázáno optimální rozdělení jejich výkonu při daném zatížení a jsou sestrojeny nákladové a spotřební charakteristiky těchto bloků. Nahlédneme do budoucnosti české energetiky, jak by asi bylo výhodné ekonomicky, ekologicky, ale hlavně technicky rozdělit výrobu elektrické energie., This bachelor´s thesis deals with heat circulation in condensing thermal power plants and the possibilities of increasing their effectiveness. Specifically it addresses several topics, namely: "increasing of inlet steam parameters, improving of vacuum in the condenser, regenerative heating, reheating of steam and, last but not least, the supercritical steam parameters." Furthermore, it also deals with losses in heat circulation, power balance and specific consumption. Another part of this thesis deals with optimization of operations and cooperation of two power plant units. A case study shows the optimal power division at load. The cost and consumption characteristics of these blocks are plotted. An insight into the future of Czech energetics is made, theorizing about the advantages of dividing electrical energy distribution, from the point of view of economy, environment, and primarily, technology.
13. Návrh optimalizace a spolupráce elektrárenských bloků
- Author
-
Radil, Lukáš, Mastný, Petr, Radil, Lukáš, and Mastný, Petr
- Abstract
Tato bakalářská práce se zabývá tepelným oběhem kondenzačních tepelných elektráren a možnostmi zvyšování jejich účinnosti. Konkrétně zmiňuje zvyšování parametrů vstupní páry, zlepšení vakua v kondenzátoru, regenerační ohřev, přihřívání páry a také v neposlední řadě nadkritické parametry páry. Dále také ztráty v oběhu, výkonové bilance a měrné spotřeby. V další části se tato práce zabývá optimalizací provozu a spoluprácí dvou elektrárenských bloků. Na příkladu je ukázáno optimální rozdělení jejich výkonu při daném zatížení a jsou sestrojeny nákladové a spotřební charakteristiky těchto bloků. Nahlédneme do budoucnosti české energetiky, jak by asi bylo výhodné ekonomicky, ekologicky, ale hlavně technicky rozdělit výrobu elektrické energie., This bachelor´s thesis deals with heat circulation in condensing thermal power plants and the possibilities of increasing their effectiveness. Specifically it addresses several topics, namely: "increasing of inlet steam parameters, improving of vacuum in the condenser, regenerative heating, reheating of steam and, last but not least, the supercritical steam parameters." Furthermore, it also deals with losses in heat circulation, power balance and specific consumption. Another part of this thesis deals with optimization of operations and cooperation of two power plant units. A case study shows the optimal power division at load. The cost and consumption characteristics of these blocks are plotted. An insight into the future of Czech energetics is made, theorizing about the advantages of dividing electrical energy distribution, from the point of view of economy, environment, and primarily, technology.
14. Návrh optimalizace a spolupráce elektrárenských bloků
- Author
-
Radil, Lukáš, Mastný, Petr, Radil, Lukáš, and Mastný, Petr
- Abstract
Tato bakalářská práce se zabývá tepelným oběhem kondenzačních tepelných elektráren a možnostmi zvyšování jejich účinnosti. Konkrétně zmiňuje zvyšování parametrů vstupní páry, zlepšení vakua v kondenzátoru, regenerační ohřev, přihřívání páry a také v neposlední řadě nadkritické parametry páry. Dále také ztráty v oběhu, výkonové bilance a měrné spotřeby. V další části se tato práce zabývá optimalizací provozu a spoluprácí dvou elektrárenských bloků. Na příkladu je ukázáno optimální rozdělení jejich výkonu při daném zatížení a jsou sestrojeny nákladové a spotřební charakteristiky těchto bloků. Nahlédneme do budoucnosti české energetiky, jak by asi bylo výhodné ekonomicky, ekologicky, ale hlavně technicky rozdělit výrobu elektrické energie., This bachelor´s thesis deals with heat circulation in condensing thermal power plants and the possibilities of increasing their effectiveness. Specifically it addresses several topics, namely: "increasing of inlet steam parameters, improving of vacuum in the condenser, regenerative heating, reheating of steam and, last but not least, the supercritical steam parameters." Furthermore, it also deals with losses in heat circulation, power balance and specific consumption. Another part of this thesis deals with optimization of operations and cooperation of two power plant units. A case study shows the optimal power division at load. The cost and consumption characteristics of these blocks are plotted. An insight into the future of Czech energetics is made, theorizing about the advantages of dividing electrical energy distribution, from the point of view of economy, environment, and primarily, technology.
15. Návrh optimalizace a spolupráce elektrárenských bloků
- Author
-
Radil, Lukáš, Mastný, Petr, Radil, Lukáš, and Mastný, Petr
- Abstract
Tato bakalářská práce se zabývá tepelným oběhem kondenzačních tepelných elektráren a možnostmi zvyšování jejich účinnosti. Konkrétně zmiňuje zvyšování parametrů vstupní páry, zlepšení vakua v kondenzátoru, regenerační ohřev, přihřívání páry a také v neposlední řadě nadkritické parametry páry. Dále také ztráty v oběhu, výkonové bilance a měrné spotřeby. V další části se tato práce zabývá optimalizací provozu a spoluprácí dvou elektrárenských bloků. Na příkladu je ukázáno optimální rozdělení jejich výkonu při daném zatížení a jsou sestrojeny nákladové a spotřební charakteristiky těchto bloků. Nahlédneme do budoucnosti české energetiky, jak by asi bylo výhodné ekonomicky, ekologicky, ale hlavně technicky rozdělit výrobu elektrické energie., This bachelor´s thesis deals with heat circulation in condensing thermal power plants and the possibilities of increasing their effectiveness. Specifically it addresses several topics, namely: "increasing of inlet steam parameters, improving of vacuum in the condenser, regenerative heating, reheating of steam and, last but not least, the supercritical steam parameters." Furthermore, it also deals with losses in heat circulation, power balance and specific consumption. Another part of this thesis deals with optimization of operations and cooperation of two power plant units. A case study shows the optimal power division at load. The cost and consumption characteristics of these blocks are plotted. An insight into the future of Czech energetics is made, theorizing about the advantages of dividing electrical energy distribution, from the point of view of economy, environment, and primarily, technology.
16. Návrh optimalizace a spolupráce elektrárenských bloků
- Author
-
Radil, Lukáš, Mastný, Petr, Hübková, Ivana, Radil, Lukáš, Mastný, Petr, and Hübková, Ivana
- Abstract
Tato bakalářská práce se zabývá tepelným oběhem kondenzačních tepelných elektráren a možnostmi zvyšování jejich účinnosti. Konkrétně zmiňuje zvyšování parametrů vstupní páry, zlepšení vakua v kondenzátoru, regenerační ohřev, přihřívání páry a také v neposlední řadě nadkritické parametry páry. Dále také ztráty v oběhu, výkonové bilance a měrné spotřeby. V další části se tato práce zabývá optimalizací provozu a spoluprácí dvou elektrárenských bloků. Na příkladu je ukázáno optimální rozdělení jejich výkonu při daném zatížení a jsou sestrojeny nákladové a spotřební charakteristiky těchto bloků. Nahlédneme do budoucnosti české energetiky, jak by asi bylo výhodné ekonomicky, ekologicky, ale hlavně technicky rozdělit výrobu elektrické energie., This bachelor´s thesis deals with heat circulation in condensing thermal power plants and the possibilities of increasing their effectiveness. Specifically it addresses several topics, namely: "increasing of inlet steam parameters, improving of vacuum in the condenser, regenerative heating, reheating of steam and, last but not least, the supercritical steam parameters." Furthermore, it also deals with losses in heat circulation, power balance and specific consumption. Another part of this thesis deals with optimization of operations and cooperation of two power plant units. A case study shows the optimal power division at load. The cost and consumption characteristics of these blocks are plotted. An insight into the future of Czech energetics is made, theorizing about the advantages of dividing electrical energy distribution, from the point of view of economy, environment, and primarily, technology.
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