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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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Study and simulation of VSC-HVDC under AC power system faults

Study and simulation of VSC-HVDC under AC power system fault...

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2010 5th International Conference on Critical Infrastructure, CRIS 2010

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 Zhejiang Electric Power Test and Research Institute Xiacheng District Hangzhou 310014 China

ISBN: (纸本)9781424480814

In this paper, control strategies of VSC-HVDC aiming to improve the ability of fault ride through of the VSCHVDC system under serious asymmetric fault at the receiving side was studied. On the basis of DQ decoupling control scheme, two additional fault control modules are proposed based on positive and negative sequence detecting technology. One is based on negative sequence voltage compensation, and the other is based on oscillating active power elimination. Simulations are carried out in PSCAD/EMTDC to verify the validity of the proposed control strategies. © 2010 IEEE.

关键词： HVDC power transmission

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Subsynchronous Oscillations Study of Non-parallel Operating AC/DC system with Series Capacitor

Subsynchronous Oscillations Study of Non-parallel Operating ...

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2010年中国国际供电会议(CICED 2010)

作者： Zheng Rui Jin Wang Xiao Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China El School of Electrical & Electronic Engineering North China Electric Power UniversityBeijing

ISBN: (纸本)9781457700668

The first non-parallel operating AC/DC system with series capacitor being constructed in China is hybrid of the Hulunbeier-Liaoning ±500kV HVDC lines and Yimin-Fengtun 500kV AC transmission system. Its subsynchronous oscillation problem become complex because of the mutual effect of series capacitor compensation and HVDC. In order to analyze the SSO characteristic of this new grid structure,six cases derived from original system have been adopted: the islanded operating HVDC(Hulunbeier-Liaoning) system,the AC(Yimin-Fengtun) system without series capacitor and HVDC lines,the AC system with FSC and HVDC lines,the AC system with FSC+TCSC(two control strategy) and HVDC lines. Through the simulation of shaft torque and rotational speed of studied generators with multimass in different faults situations,the results show that the non-parallel operating AC/DC system can mitigate SSO caused by HVDC or FSC. The system characteristic is in association with the system structure,compensation type and control strategy of TCSC.

关键词： AC/DC TCSC SSO series compensator non-parallel operation

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A droop control method of microsources based on divided self-adjusting slope coefficient

A droop control method of microsources based on divided self...

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

作者： Li, Peng Wang, Wei Yang, Xilei Wang, Shuai Cui, Hongfen Gao, Changzheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei China Jilin Electric Power Company Limited Electric Power Research Institute Changchun 130021 Jilin China

ISBN: (纸本)9781424459407

Microgrid, as a new effective way for large scale new energy and renewable energy power generation systems connected to the grid, injects new vigor into the power system. Focusing on the characteristics of P-f (active power versus frequency) droop and Q-V (reactive power versus voltage) droop, on the basis of analyzing the variable slope coefficient of droop characteristic, a droop control method of microsources based on divided self-adjusting slope coefficient is proposed in this paper. By calculating the quantity of the load fluctuation, this control method dynamically adjusts the active and reactive power maximums of inverters in the range of the inverter ratings to change the slope coefficients of droop curves. The aim of this method is to decrease the deviation of the frequency and voltage magnitude of the microgrid bus effectively. The simulation result verifies the correctness and feasibility of this control method. ©2010 IEEE.

关键词： Reactive power

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Simulation and Test Study on Module Based controllable Shunt Reactor

Simulation and Test Study on Module Based Controllable Shunt...

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

作者： Ke Li Zhongdong Yin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

This paper puts forward a TCR module based new type shunt high voltage reactor, which consists many small capacity thyristor controlled reactor modules and via three-windings transformer connecting to system. The secondary windings of transformer adopt duplex winding structure and each has multi-bank TCR modules being in delta connection. In this topology, the harmonic current injected into the power system is limited remarkably. A 500 kvar/10 kV industrial prototype was developed, and digital simulation based on EMTDC/PSCAD and field test were carried out to verify the characteristics of topology proposed.

关键词： Testing Shunt (electrical) Inductors Topology power system harmonics PSCAD Thyristors Voltage control control systems Joining processes

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Calculation and analysis of capacity credit of wind farms based on Monte-Carlo simulation

Calculation and analysis of capacity credit of wind farms ba...

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IEEE General Meeting power& Energy Society

作者： Shuo Zhang Gengyin Li Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

How to compare the wind power generation and traditional power generation in aspect of capacity is essential of power system expansion. The capacity credit is a convenient and effective way to compare these two different types of power generation. Unfortunately, the definition of capacity credit of wind farms is not clear and generally acknowledged. In this paper, a more clear definition of wind farms' capacity credit based on well-known concept of effective load carrying capability (ELCC) is presented. As well as a calculation method of wind farms' capacity credit based on non-sequential Monte-Carlo simulation, this method considered the failure of transmission lines. The secant method is used at capacity credit calculation process, and the modified direct current optimal power flow method is adopted in power flow calculation. Several different influence factors of capacity credit of wind farms such as the cut-in, cut-out and rated wind speed and the rated capacity of the wind turbine generator, transmission capacity of transmission lines and different integration solutions are analyzed in IEEE-RTS79 case studies.

关键词： Wind farms Reliability power system reliability power generation power transmission lines Monte Carlo methods

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