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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...

引用

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 ...

引用

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...

引用

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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Wind power price regulation considering wind power fluctuation

Wind power price regulation considering wind power fluctuati...

引用

International Conference on Critical Infrastructures, CRIS

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

ISBN: (纸本)9781424480807

Wind power penetration to power systems is increasing rapidly in the recent years due to its environmental benefit, while wind power fluctuation also brings some problems to power system operation which impacts the transmission company's willingness to accept wind power. The most serious conflict influencing wind power development is that the currently adopted price of wind power on-grid does not take this fluctuation or the impact on the system operation into account. Currently, quotas and enforcing access is broadly used in wind power regulation. It is now required that all wind power output should be accepted by the grid, and is rewarded with a guided rate. But with the increase of wind power penetration to power grid, a more effective price regulation to wind power should be set up with wind output uncertainty into account. This paper takes wind farms in different areas in China as the research objects and uses accounting cost analysis approach to calculate wind power costs, which enables the wind farms in different areas to get the same rate of return on investment as that of thermal power plants. These tariffs will be derived as a basic price for the reference by the power grid then. The basic wind power prices are multiplied by a penalty factor which is an innovative as the final prices paid to the wind farms. The penalty factor is related to the accuracy of wind power output. If the accuracy of the wind farm output is higher than that of the regional average one, the penalty factor will be greater than one, so that the really paid wind power price is higher than the base value and the income of the wind farm will be increased, otherwise the earnings will be reduced. To illustrate the problem, an example is given. The use of this penalty factor will eventually help stimulate wind farms to improve the accuracy of wind power output, and improve the stable operation of the systems with large wind power penetration, and promote the sustainable development of wind

关键词： Fluctuations

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Subsynchronous oscillations study of non-parallel operating AC/DC system with series capacitor

Subsynchronous oscillations study of non-parallel operating ...

引用

作者： Zheng, Rui Xiao, Xiangning Jin, Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

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. © 2010 Chinese Soc for Elec Eng.

关键词： Electric utilities

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A Novel Wide-area Fault Location Algorithm Based on Fault Model

A Novel Wide-area Fault Location Algorithm Based on Fault Mo...

引用

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

作者： Jing Ma Jin-long Li Zeng-ping Wang Qi-xun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

A novel wide-area fault location algorithm is proposed in this paper. Fault model is developed in super-imposed network, and then based on network correlation coefficient matrix (NCCM), location function is defined. Finally search technique with adaptive step is used to locate fault branch and fault distance. This method requires few PMUs, avoids modifying node admittance matrix and NCCM. It has less calculation burden, and is easy to achieve. Simulation results based-on PSCAD show that the algorithm can locate fault branch accurately and fault distance precisely in condition of limited measurement points. And fault location results are not affected by fault type or fault resistance.

关键词： Fault location power system modeling Phasor measurement units Transmission line matrix methods power system simulation PSCAD power system reliability power system faults power transmission lines Voltage

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New Principle of Single-Ended Fault Location Base on Verification for Transmission lines

New Principle of Single-Ended Fault Location Base on Verific...

引用

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

作者： Jiangtao Yu Yanjun Jiao Zengping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

A new principle of single-ended fault location is presented. It is proposed to carry out the correct fault distance by comparing the reverse traveling waves break time at the fault point, after transition resistance is calculated approximately. Distortionless model is employed to deduce the single-ended electric quantities to the verification point. The judging criterion for fault point verification and algorithm for the transition resistance calculation are introduced in detail, after reviewing the relationship between fault branch currents and fault current traveling waves. In this paper, the traveling wave propagation velocity and load current affect the calculation accuracy, will not affect the result of fault location. The simulation and calculation results by ATP and MATLAB confirm sensitivity and reliability of the principle.

关键词： Fault location Transmission lines Electric resistance power transmission lines Mathematical model Accuracy Transmission line matrix methods power system transients Voltage Laboratories

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Study on sequence component based fault phase selector during power swings

Study on sequence component based fault phase selector durin...

引用

International Conference on Critical Infrastructures, CRIS

作者： Wei Li Tian-shu Bi Qi-xun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

For digital distance relays, in order to get the correct measuring impedance, phase selector is widely used to identify the fault phases first. However, when a fault occurs at the line during power system swings, the traditional sequence component based phase selector might not identify the fault phase correctly, which leads to mal-operation of distance relays. Therefore, how to improve the existing sequence component based phase selector, especially at the condition of power system swings, is crucial. The relationship between the relative phase and amplitude of the sequence component of various asymmetric faults is analyzed. An improved asymmetric fault phase selector during power swings is proposed according to the corresponding relationship between the zero, negative sequence current components and the asymmetric fault types. The simulation results have shown the effectiveness of the method under power swings. Combining with fault component phase selector in no power swing, this method can perfectly solve the phase selection problem of transmission lines.

关键词： Grounding

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