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2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Xu, Yuqin Wu, Yingchao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 619 North of Yonghua Street Baoding City Hebei Province China

ISBN: (纸本)9781424480814

Distributed generator (DG), with its flexible power generation, environment-friendly advantages has been more widely used in distribution system, which has brought some influence to the traditional distribution network reliability evaluation. In this paper, two different models for conventional DG and wind turbine generator (WTG) are established for reliability evaluation, based on different energy sources and operation characteristics. This paper presents a technique to obtain the WTG output using statistical wind speed information, considering to the intermittent characteristics of wind power. On this basis, an improved minimal cut set algorithm is proposed to evaluate the reliability of distribution network with DG. Finally, the simulation of a typical distribution line with DG verifies the validity of this method. © 2010 IEEE.

关键词： Wind power

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Research on Submodule Capacitance Voltage Balancing of MMC Based on Carrier Phase Shifted SPWM Technique

Research on Submodule Capacitance Voltage Balancing of MMC B...

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2010年中国国际供电会议(CICED 2010)

作者： Xin Zhao Chengyong Zhao Guangkai Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry

ISBN: (纸本)9781457700668

Modular multilevel converter (MMC) is a new multilevel converter suitable for VSC-HVDC. The principle of the submodules and converter topology are introduced in this paper. A novel carried phase shifted sinusoidal pulse width modulation (CPS-SPWM) scheme suitable for MMC in VSC-HVDC is presented. Voltage balancing among the submodules is a crucial problem of MMC. Based on the energy equipartition and voltage balance,a capacitor voltage-balancing strategy is presented in this paper with the topology of MMC and modulation. This scheme could effectively ensure each submodule at the same capacitor voltage level. The correctness and effectiveness of the schemes were verified by the simulation.

关键词： modular multilevel converter high voltage direct current transmission carrier phase-shifted sinusoidal pulse width modulation technique circulating current capacitance voltage balancing

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Global Governor-side Damping controller for Low Frequency Oscillation of power systems Based on Partial State Feedback

Global Governor-side Damping Controller for Low Frequency Os...

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The 22nd China control and Decision Conference(2010年中国控制与决策会议)

作者： Ancheng Xue Tianshu Bi Pinghua An Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of E Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of E

Low frequency oscillation (LFO) is harmful to power system security and stability. The traditional solutions for LFO are the power system stabilizer (PSS) with local or global signal implemented on the excitations. This paper explores the global governor-side damping controllers for LFO, i.e., controller with input from the wide area measurement system (WAMS). Design strategy of global governor-side damping controller with remote signal from WAMS is proposed, based on the partial state feedback theory. Simulation results in a 4-generator-2-area power system show the effectiveness of the proposed global governor-side damping controller.

关键词： Low Frequency Oscillation Damping controller Wide Area Measurement system(WAMS) Governor Partial State Feedback

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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

作者： Li, Gang Wang, Zeng-Ping Ren, Jian-Wen Zhen, Xu-Feng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 China Bao Ding Power Supply Company Baoding 071000 China

ISBN: (纸本)9781424465262

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. © 2010 IEEE.

关键词： Electric power transmission

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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

ISBN: (纸本)9781424465262

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. © 2010 IEEE.

关键词： Electric load flow

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An adaptive distance protection scheme for distribution system with distributed generation

An adaptive distance protection scheme for distribution syst...

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2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Ma, Jing Li, Jinlong Wang, Zengping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China Chengdu Electric Power Bureau 610021 Chengdu Sichuan Province China

ISBN: (纸本)9781424480814

The value setting of the traditional distance protection has become very difficult for the distribution system with distributed generators (DGs) owing to the randomness of the DG output power. This paper proposes a new adaptive distance protection scheme to solve this problem. Firstly, on the basis of the connected point of DGs, the protected feeders are divided into different zones, with adaptive distance protection configured at the upstream side of DG. Then, based on a fault characteristic analysis of the distribution system with DG, the adaptive distance protection scheme for the distribution system with DG is studied to solve this problem. The results show that this scheme can automatically calculate the settings according to the operation mode and the output power of DG with no need for communication. Compared with the traditional adaptive protection scheme, the performance of this method is greatly improved. Simulation results on a 10 kV distribution system have verified the validity of the scheme proposed. © 2010 IEEE.

关键词： Distributed power generation

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Analysis of subsynchronous resonance containing load models

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Dianwang Jishu/power system Technology 2010年第4期34卷 76-81页

作者： Chen, Wu-Hui Bi, Tian-Shu Yang, Qi-Xun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Changping Disrtict Beijing 102206 China

In this paper, a set of five-order dynamic equations of induction motor in d-q coordinates of synchronous generator, which can be interfaced with network equations and generator equations, is derived, meanwhile the five-order linearized equations of induction motor as well as the equations of load models containing constant impedance, constant current and constant power are derived too. Utilizing the IEEE first benchmark model, the linearized models containing above-mentioned loads for analysis on subsynchronous resonance (SSR) is established. The influences of above-mentioned static load models and synthetic load model consisting of induction motor and constant impedance on damping characteristics of torsional modes are analyzed. Analysis results show that above-mentioned different load models leads to instability of different damping characteristics of torsional modes, and the analysis results may be over optimistic without regards to load models, and it is impossible to ensure the analysis results always conservative by means of a kind of load model.

关键词： Damping

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A scheme of connecting microgird to AC grid via flexible power electronics interface

A scheme of connecting microgird to AC grid via flexible pow...

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2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Yue, Wei Zhao, Chengyong Lu, Yi Li, Gang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Electric Power Research Institute of Zhejiang Xiacheng District Hangzhou 310014 China

ISBN: (纸本)9781424459407

Based on the synthetic control of microgrid, a flexible power electronics interface is developed in this paper. Considering distributed generation types and storage devices, different control strategies are adopted in controller design for different distributed generation units. The interface comprises a couple of back-to-back VSC converters, and exports variable active power and reactive power in order to maintain the power balance inside the microgrid. Apparently, the interface separates the microgird from the AC grid, prevent harmonic component transmitting from one side to the other side and control the active power precisely flowing between microgrid and main grid. Besides, it's also in charge of reactive power compensation and keeping the microgrid voltage stable. Simulation results can approve its superiority and validity comparing with direct connection. ©2010 IEEE.

关键词： Distributed power generation

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Integration of protection and control systems for smart substation

Integration of protection and control systems for smart subs...

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2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Ma, Jing Wang, Tong Wu, Jie Wang, Zengping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China State Nuclear Electric Power Planning Design and Research Institute 100094 Beijing China

ISBN: (纸本)9781424480814

Digital based data processing and protection and control system along with digital communication networks introduces new structures for substation protection and control systems and new methods for intelligent protection and control systems. This paper presents a unique vision for the future integration of protection and control systems. Firstly, the basic concept and configuration of the developed protection and control systems for smart substation is introduced. The features and functions of integrated protection and control systems for smart substation are then discussed and compared with that of the traditional substation in detail. © 2010 IEEE.

关键词： Data handling

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Effect of modal superimposition on transient torque amplification of subsynchronous resonance

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2010年第28期30卷 1-6页

作者： Chen, Wuhui Bi, Tianshu Yang, Qixun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Changping District Beijing 102206 China

The mechanism of superimposed modal interactions was developed by using the second-order solutions of torques. The frequency-resonant and frequency-beating sup-erimposed modal interactions of two modes were mathematically derived. The effect of three kinds of initial phase relationships comprising in-phase, opposed-phase and quadrature-phase on the two types of superimposed modal interactions, was investigated. The results show that the maximum peak of frequency-resonant superimposed modal interactions depends on the initial phase whereas the maximum peak of frequency-beating superimposed modal interactions approaches the sum of the initial amplitudes of superimposed modes and is independent of the initial phase. This analysis relates the system modes and their interactions to the transient torque amplification and lends itself to understanding the exact mechanism of the transient torque amplification. Furthermore, the measure can be acquired for mitigating the transient torque amplification. The IEEE first benchmark system was adopted to implement the study and some new viewpoints of practicable significance were obtained. © 2010 Chin. Soc. for Elec. Eng.

关键词： Torque

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