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2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Wei, Junqiang Li, Gengyin Zhou, Ming Lo, K.L. Department of Mathematics North China Electric Power University Changping District Beijing 102206 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424480814

In practical power markets, Available Transfer Capability (ATC) is crucial for transmission customers, system operators and power marketers to make a good choice. It is an indication of the expected transfer capability remaining on the transmission network. In order to assure the secure, economic, stable and reliable operation of power systems, the assessment of ATC should be carried out instantly. Most of the existing ATC calculation are mainly focused on AC power systems and based on deterministic techniques. As high performance computing has been extensively used in scientific computation and technology, less work has been done on evaluation of ATC by using parallel algorithm. This paper is dealing with the evaluation of ATC by stochastic parallel algorithm in an AC power system. Due to the stochastic nature of power system behaviors, it is important to assess ATC from a statistical and risk analysis point of view. Considering the dynamics, time-varying and uncertainties of power systems, several statistical indices is presented to evaluate ATC. They are calculated based on Monte Carlo simulation and parallel computing. The system operation states can be simulated by Monte Carlo method, and the parallel algorithm based on MATpower (A MATLAB™ power system Simulation Package) is developed. Case study with an IEEE 30-bus power system is used to verify the presented approach. Five-number summary and other statistical indices of ATC are calculated. The results show that the proposed method can elapse shorter computation time and it is more effective and practical. Some new attractive issues are suggested at the end. © 2010 IEEE.

关键词： Parallel algorithms

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The Study on the Compensation Strategy of Three Single-Phase H-bridge DVR

The Study on the Compensation Strategy of Three Single-Phase...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Zhe Sun Chunlin Guo Yonghai Xu Xiang ning Xiao Ying ying Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing P. R. China

Three single-phase H-bridge DVR is a kind of dynamic voltage restorer (DVR) which is used very widely. The traditional analysis method of compensation strategy has some shortcomings so that it is not suitable for this kind of DVR. A new analysis method which could overcome the shortcomings of the tradition method is proposed in the paper. The new method not only has definite physical concept but also could determine the compensation range easily when unbalanced voltage sag happened. More importantly, it could be applied to unbalanced load. Adopting the new method, the compensation strategy of three single-phase H-bridge DVR is studied. The simulation result shows the correctness of the theoretical analysis.

关键词： Voltage fluctuations power system dynamics power system restoration Analytical models Clocks Sun Laboratories power system protection power system security monitoring

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Monte Carlo simulation based assessment of available transfer capability in AC-DC hybrid systems

Monte Carlo simulation based assessment of available transfe...

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2010 5th International Conference on Critical Infrastructure, CRIS 2010

ISBN: (纸本)9781424480814

Available transfer capability (ATC) is defined as a measure of the system's capability for transfers of power for further commercial activity, over and above already committed uses. In practical power markets, ATC can provide important information for transmission customers, system operators and power marketers. The assessment of ATC should be carried out to assure the secure, economic, stable and reliable operation of power systems. Most of the existing ATC calculation are mainly focused on AC power system and based on deterministic techniques. As high voltage direct current (HVDC) power distribution systems have been extensively used in modem transmission network, less work has been done on evaluation of ATC in AC-DC hybrid power system. This paper is dealing with the evaluation of ATC for the integration of HVDC link with an AC power system. The mathematical model of ATC for AC-DC hybrid power system is proposed. Due to the stochastic nature of power system behaviors, it is important to assess ATC from a statistical and risk analysis point of view. Considering the dynamics, time-varying and uncertainties of hybrid power systems, several statistical indices are presented to evaluate ATC and they are calculated based on Monte Carlo simulation. States of system operation can be simulated, and the algorithm based on MATpower (A MATLAB™ power system Simulation Package) is developed in the environment of MATLAB 7.5. Case study with a modified IEEE 30-bus AC-DC hybrid power system is used to verify the presented approach. Sequential solution method is employed to deal with the AC-DC power flow. Fivenumber summary and other statistical indices of ATC are calculated. The results show that the proposed method is effective and practical. The research achievements are undergoing to transfer to the application in other hybrid power systems with different control style, and some new problems are suggested at the end of paper. © 2010 IEEE.

关键词： MATLAB

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Intelligent diagnosis algorithm of power equipment based on acoustic signal processing

Intelligent diagnosis algorithm of power equipment based on ...

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International Workshop on Advanced Computational Intelligence (IWACI)

作者： Shutao Zhao Baoshu Li Yumin Ge Weiguo Tong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China School of Control Science and Engineering North China Electric Power University Baoding Hebei China

ISBN: (纸本)9781424463343

The operational state determination of power equipment is a key prerequisite to realize maintenance. On studying the relationship between power equipment state and its acoustic wave mutation character, a new diagnosis scheme of power equipment fault has been put forward. After the running acoustic signal acquired, MFCC coefficient has been selected the acoustic signal various band energy feature, and dynamic time warping (DTW) is utilized to determine equipment type. Then local energy band based wavelet packet decomposition is used in fault feature extraction. According to these feature parameters values and expert experience scoring, the knowledge based of fault database was established to diagnosis power equipment state and its fault level. Lastly, By 200 group transformer measured acoustic signal analysis experiments have been completed, and the results show the series acoustic treatment of methods is effective, and the diagnosis scheme of equipment failures have great practical value.

关键词： Feature extraction Wavelet packets Fault diagnosis Mel frequency cepstral coefficient Band pass filters

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Impact of electromechanical coupling on shaft torsional dynamics

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2010年第4期30卷 49-55页

作者： Chen, Wu-Hui Bi, Tian-Shu Yang, Qi-Xun Peng, Qian Key Lab. of Power System Protection and Dynamic Security Monitoring and Control Ministry of Edu. North China Electric Power University Beijing 102206 China State Nuclear Electric Power Planning Design and Research Institute Beijing 100094 China

The electromechanical coupling model is employed to define the all-mode shape and torsional mode shape, and deduce the linear solutions of torques. Based on the solutions of torques, mode shapes of torques and mode contribution factors of torques are defined. The above physical concepts can directly describe shaft torsional dynamics, and get more insights than the mode shapes previously defined. Moreover, the theoretical basis and the physical implications of free vibration and forced vibration models are analyzed in detail. In light of the difference between the electromechanical coupling model and the free vibration model, the deviations between the calculated and measured values are explained for mode shapes and natural torsional frequencies. The difference between the dynamics of the electromechanical coupling and forced vibration models is analyzed as well. © 2010 Chin. Soc. for Elec. Eng.

关键词： Electromechanical coupling

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Comparison and verification of load model based on PSASP

Comparison and verification of load model based on PSASP

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International Conference on Critical Infrastructures, CRIS

作者： Huilin Wang Jin Ma Xiaoyu Zheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education School of Electrical and Electronic Engineering North China Electric Power University Beijing China

In load model verification process, the accuracy of model and its parameters makes the actual operating conditions unable to reappear in simulation. The information deviation between measured data and verifiable simulation data makes it impossible to ensure the descriptive power of measurement-based load model for real load characteristics. With this problem, the paper applies closed-loop verification approach to this question for the first time. The closed-loop verification approach is common in system identification study but newly used in load model comparison and validation. Two cases based on PSASP are studied in the paper. The object of this study is composite load model and the verification is carried out on a 10-generator, 39-bus New England power system. They both prove the validity of composite load model and the feasibility of this verification approach.

关键词： Load modeling power system dynamics Data models Helium Generators Integrated circuit modeling

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Multi-objective Voltage Quality Disturbance Generator with Cascade H-bridges

Multi-objective Voltage Quality Disturbance Generator with C...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Renzhong Shan Xiangning Xiao Zhongdong Yin Qiao Liu Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

A novel main circuit topology of voltage quality disturbance generator is proposed in this paper, composed of PWM rectifier and cascade H bridge inverter. The three phase inverter is decoupling controlled. The main advantage of the topology is a hybrid structure, the mainly power of voltage quality disturbance generator is supplied by system source and the small power is supplied by inverter, so the capacitor generator is easy to realize larger because of lower active loss. PWM rectifier is adopted to maintain the dc-bus voltage stably, the later inverter is composed of cascade H-bridges. The inverter is controlled by carrier phase shifting with FPGA. The simulation model is set up on the platform of PSCAD/EMTDC, the problems of voltage fluctuation and flicker, sag and harmonic is researched by theoretical analysis and simulation. Finally, the simulation and experimental results show that the proposed main circuit topology and control strategy is feasible and efficient.

关键词： Pulse width modulation inverters Circuit topology Circuit simulation Rectifiers power generation Hybrid power systems Analytical models Voltage fluctuations Bridge circuits power supplies

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power system transmission section security protection control program

Power system transmission section security protection contro...

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Gang Li Zeng-Ping Wang Jian-Wen Ren Xu-Feng Zhen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China Baoding Power Supply Company Baoding China

The removal of overload lines can cause power flow transferring, which may give rise to some transmission lines overload. By analysis of available methods of determining transmission sections with shortcomings, this paper proposes a new way to determine transmissions section based on real-time power flows, and then deduce a new criterion of transmission section security protection based on the redundancy of normal line's power flows. A new transmission section security protection control scheme based on wide area measurement system (WAMS) is also proposed. When there is line overload, we should make a decision according to the protection criterion, if the transmission lines are safe after the overload removal, allow the backup protection to cut off the overload line; if not, block the protection. Therefore, it can avoid cascading overload tripping. At last, the validity of proposed algorithm is verified by the simulation results of CEPRI 36-bus system.

关键词： security Load flow Redundancy Real time systems power system dynamics Machine learning

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A transmission line overload control program based on wide area information

A transmission line overload control program based on wide a...

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International Conference on Machine Learning and Cybernetics (ICMLC)

When taking emergency control measures to eliminate the overload circuits, it is necessary to ensure the normal lines of power system won't overload. Therefore, it's necessary to analyze the security of the normal lines when take measures to eliminate overload. Based on the analysis of traditional methods of eliminating overload lines, this paper proposes an new overload control scheme based on wide area information, which can in parallel analyzing the impact of the normal line's redundancy on the regulated quantity of matching units, then the analysis results are sent to the control center, which finally determines the regulated quantity. It can ensure the normal lines won't overload when eliminating overload, and also can improve the computing speed of the whole control process. Therefore, it's very conducive to ensure the power system operating in a safe and stable state. Finally, simulation experiments verify the program is fast and reasonable.

关键词： Sensitivity security Load flow power system dynamics Redundancy Machine learning

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Compensation strategy of switching dead-time effect based on frequency domain model

Compensation strategy of switching dead-time effect based on...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Renzhong Shan Xiangning Xiao Zhongdong Yin Qiao Liu Key Laboratory of Power System Protection and Dynamic. Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

The problem of current waveform distortion because of dead-time inserted in power electronic applications is analyzed and researched in this paper, and the equivalent voltage source model is set up in to analyze the low frequency harmonic voltage because of dead-time effect. The control strategy of harmonic injection is proposed to compensate the current distortion due to dead-time effect. Firstly, obtains the application output current amplitude and phase of mainly harmonic current by Fourier transform, then calculates the compensation instructive voltage according to the connected inductor and dc voltage. Based on H-bridges cascaded static synchronous compensator (STATCOM), the experiment on a STATCOM based on digital signal processor (DSP) and (Field Programmable Gate Array) FPGA is implemented. The simulation and experimental results show that the proposed method is feasible and efficient to compensate the current distortion.

关键词： Frequency domain analysis Harmonic distortion Harmonic analysis Automatic voltage control Field programmable gate arrays power electronics power system harmonics Low voltage Fourier transforms Inductors

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