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第三十三届中国控制会议

作者： ZHU Mu LIU Jizhen LIN Zhongwei State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer EngineeringNorth China Electric Power University

ISBN: (纸本)9781479947249

When the wind power electricity system working above the rated wind speed, the disturbed wind speed can lead to the output power ripple easily, which causes a significant negative influence on the stability of the power grid. In order to overcome this disadvantage, this paper discusses the mixed H2/H∞ pitch angle control design problem for the nonlinear wind turbine generator system(WTGS), where the turbulence is regarded as the disturbance input. Especially, the traditional exact linearization and the pole placement techniques are also applied to guarantee the desired control performance and expected dynamic characteristics in the situation of a large-scale variety of the system operation points. The simulation results show the effectiveness of the proposed method.

关键词： Wind turbine,mixed H2/H∞ control,pole placement,exact linearization,pitch control

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Dynamic fuzzy modelling for organic rankine cycle systems

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ICIC Express Letters 2014年第11期8卷 3007-3013页

作者： Zhang, Jianhua Wang, Zhuofei Li, Bo Wang, Rui Lin, Mingming State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University No. 2 Beinong Road Changping District Beijing China Shisanling Pumped Storage Power Station Changping District Beijing China School of Control and Computer Engineering North China Electric Power University No. 2 Beinong Road Changping District Beijing China

Based on recursive fuzzy c-means (FCM) algorithm, the Takagi-Sugeno model is established for Organic Rankine Cycle (ORC) based waste heat recovery systems. The premise parameters are obtained by FCM algorithm while the consequent parameters are identified by forgetting factor least-square (FFLS) algorithm. The validity of identification algorithm is tested and verified. simulation results show that the established T-S model can characterize the dynamic characteristics of the ORC system well.

关键词： Waste heat

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Research on a battery balancing method for lithium-Ion battery pack of electric vehicle

Research on a battery balancing method for lithium-Ion batte...

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2014 International Conference on Energy Research and power Engineering, ERPE 2014

作者： Chen, Yi Ning Gui, Yu He, Hong Power Management of Liaoning Provincial Government Shenyang 110035 China State Key Laboratory of Automotive Simulation and Control Ji Lin University Changchun 130022 China

ISBN: (纸本)9783038351603

As the key technology of the electric vehicle, more and more research on battery management system has been done. And the balancing technology is the important part of battery management system. In this paper, a multi-inductor balancing method based on the Buck-Boost topological structure is used to improve batteries' inconsistencies by obtaining parameters of the battery pack in real time. The proposed balancing method can improve batteries' inconsistencies so as to increase the capacity utilization rate of the battery pack and prolong the battery lifespan. And in this paper a series of bench experiments were done to examine the effectiveness of the balancing method. © (2014) Trans Tech Publications, Switzerland.

关键词： Lithium-ion batteries

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Virtual flux based direct power control for three-level PWM rectifier 17

Virtual flux based direct power control for three-level PWM ...

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2014 17th International Conference on Electrical Machines and systems, ICEMS 2014

作者： Yingchao, Zhang Liping, Jin Yongchang, Zhang Ting, Lu Zhengming, Zhao Key Lab. of Special Power Supply of PLA Chongqing Communication Institute China North China University of Technology Power Electronics and Motor Drive Engineering Research Center China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University China

ISBN: (纸本)9781479951611

This paper presents a new control strategy for three-level neutral point clamped (NPC) pulse width modulated (PWM) rectifier without power source voltage sensors. The relationship between instantaneous power and voltage vectors is derived mathematically. Virtual flux is estimated and used to calculate the phase of the power source voltage and instantaneous power. On these bases, a direct power control (DPC) scheme for three-level PWM rectifier is presented. An optimal switching table is established, vector switching scheme and balance strategy for the neutral point potential are discussed. Variable switching frequency and dynamic process of the startup are also analyzed. Experimental results have verified the theoretical approach and the three-level PWM rectifier with proposed DPC based on virtual flux exhibits several advantages, such as simple algorithm, low costs and excellent dynamic performance. © 2014 IEEE.

关键词： Electric rectifiers

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Sustained overvoltage control considering power system restoration dynamic process

Sustained overvoltage control considering power system resto...

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2014 International Conference on Energy Research and power Engineering, ERPE 2014

作者： Chen, Bin Wang, Hong Tao Wei, Zhong Kang Wang, Chun Yi Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan 250061 China State Grid Jibei Electric Power Company Beijing 100053 China State Grid Shandong Electric Power Company Jinan 250001 China

ISBN: (纸本)9783038351603

Changeable sensitivity and safety margin are proposed in this paper, which can avoid the voltage violation according to the operation of the current situation. A simulation test is presented to demonstrate the proposed method can decrease adjusting amounts and restoration time efficiently. © (2014) Trans Tech Publications, Switzerland.

关键词： Restoration

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Coordinated control of variable-speed constant-frequency wind farms in weak grids

Coordinated control of variable-speed constant-frequency win...

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2014 International Conference on Energy Research and power Engineering, ERPE 2014

作者： Li, Chao Wang, Hong Tao Wei, Zhong Kang Wang, Chun Yi Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan 250061 China State Grid Jibei Electric Power Company Beijing 100053 China State Grid Shandong Electric Power Company Jinan 250001 China

ISBN: (纸本)9783038351603

Variable-speed constant-frequency (VSCF) wind farms are gradually becoming a significant proportion of generation in weak grids with constantly increasing penetration rate, and it should certainly take responsibility of the grid frequency and voltage stability. Based on the P-Q performance curve of doubly fed induction generator (DFIG), by introducing static synchronous compensator (STATCOM), this paper presents a coordinated control strategy of active power and reactive power to deal with fault and load disturbance in weak grids. simulation results show that the proposed coordinated control strategy can effectively improve the frequency and voltage stability of the grids. © (2014) Trans Tech Publications, Switzerland.

关键词： Wind farm

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Direct heuristic dynamic programming method for power system stability enhancement

Direct heuristic dynamic programming method for power system...

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2014 American control Conference, ACC 2014

作者： Yu, Miao Lu, Chao Liu, Yongjun School of Mechanical-electronic and Automobile Engineering Beijing University of Civil Engineering and Architecture Beijing 100044 China State Key Laboratory for Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing 100084 China Technology Research Centre of China Southern Power Grid Guangzhou 510623 China

ISBN: (纸本)9781479932726

In this paper a neural network-based approximate dynamic programming method, namely direct heuristic dynamic programming (direct HDP), is applied to power system stability control. Direct HDP is a learning and approximation based approach to address nonlinear system control under uncertainty. In the present paper, real-time system responses provided by wide area measurement system (WAMS) are used to construct such controllers which are uniquely tailored for the problems under consideration. In addition, the controller learning objective is formulated as a reward function that reflects global characteristics of the power system low frequency oscillation under the consideration of coupling effect among system components. The contribution of the paper includes a convergence proof of the direct HDP algorithm using an LQR framework, as well as case study to illustrate the proposed learning control algorithm. The case study aims at providing a new solution to a difficult large scale system coordination problem where the China Southern power Grid is used for. © 2014 American Automatic control Council.

关键词： controllers

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Probabilistic substation fault diagnosis considering instrumentation channels and heterogeneous information: A unified Bayesian network model

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Qinghua Daxue Xuebao/Journal of Tsinghua University 2014年第10期54卷 1384-1390页

作者： Mu, Jianan Sun, Hongbin Wu, Wenchuan Guo, Qinglai Zhang, Boming State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing100084 China

Fault diagnosis plays an important role in improving power network troubleshooting capability. Conducting local fault diagnosis in substations can make full and quick use of abundant local information. A substation fault diagnosis method was presented based on Bayesian network to adapt to a wealth of information and distributed autonomy under smart grid environment. The method is effective in dealing with uncertainties induced by malfunctions of protection relays and circuit breakers as well as instrumentation channel errors. Heterogeneous information available in substations, such as sequence of events (SOEs), wave records and blocking signals, was also integrated into the method, with the junction tree algorithm used to conduct probabilistic reasoning. The results show that breaker SOEs can be better utilized when considering instrumentation channels. Furthermore, introduction of wave records and blocking signals can significantly improve diagnosis accuracies. ©, 2014, Press of Tsinghua University. All right reserved.

关键词： Bayesian networks

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A combined PWM algorithm to eliminate spikes of common mode voltages

A combined PWM algorithm to eliminate spikes of common mode ...

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IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)

作者： Fang Liu Zhengming Zhao Ting Lu Shusheng Wei Kai Li Sate Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

Various pulse width modulation strategies have been proposed to reduce the common mode voltage (CMV) in the variable speed motor drive system. However, unexpected voltage spikes appear as a result of the dead time effect. This paper investigates the principles of those reduced CMV PWM (RCMV PWM) methods mathematically and analyzes the reasons for those voltage spikes theoretically and experimentally. Results suggest that three-dimension active zero state PWM and near state PWM can effectively eliminate the spikes even with the dead time effect taken into consideration. Then a combined algorithm using those two methods is proposed, and it covers the linearity modulation region as large as the conventional space vector PWM. The switchover between those two methods is smooth along with the variation of the modulation index. Experimental results show that no distortion is brought to the modulation wave and verify the validity and feasibility of the proposed combined algorithm.

关键词： Pulse width modulation Vectors Switches Inverters Integrated circuits Induction motors

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An adaptive wind power smoothing method with energy storage system

An adaptive wind power smoothing method with energy storage ...

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IEEE General Meeting power& Energy Society

作者： Hanchen Xu Can Wang Chao Lu Zhigang Lu State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Electric Power Research Institute of China Southern Power Grid Guangzhou China

The random and intermittent nature of wind power (WP) makes the integration of large-scale wind farms into power system problematic. The energy storage system (ESS) is an effective means to smooth the WP. This paper presents a novel Kalman filter (KF) based adaptive wind power smoothing method to determine the power output of an ESS. ESS capacity can be significantly reduced by adjusting the parameters of KF adaptively according to the WP fluctuation. Meanwhile, a fuzzy logic controller is introduced to manage the remained energy level (REL) of the ESS. By considering the current WP fluctuation, the REL and the power output of the ESS together in the controller, the REL can be successfully managed to a reasonable range without deteriorating the WP fluctuation. A test case based on data from an actual wind farm validated the effectiveness of the proposed method.

关键词： Fluctuations Wind power generation Energy storage Wind farms Kalman filters Fuzzy logic Smoothing methods

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