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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Monitoring and Control"

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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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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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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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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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Synthetic evaluation of power quality based on entropy of relative intensity and local variable weight

Synthetic evaluation of power quality based on entropy of re...

引用

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

作者： Li, Guodong Li, Gengyin Fu, Xueqian Zhou, Ming Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China School of Electrical and Electronic Engineering North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9781424459407

A new method of power quality synthetic evaluation based on relative intensity entropy and local variable weight is presented in the paper. This method firstly uses the relative intensity entropy theory to extract the weights of the individual power quality indicators, and then does synthetic evaluation to the power quality data combined with the method of local state variable weight to amend the index weights, and gives the assessment point levels of their power quality. This new evaluation method embodies the gradual change of objective evaluation index weights with indicators values, and could do incentives and penalties to some weights of internal indicators. The simulation results show that the method proposed in this paper is more suitable for power quality evaluation, and has more practical significance. ©2010 IEEE.

关键词： power quality

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Zonal pricing model of voltage quality service based on sag energy index

Zonal pricing model of voltage quality service based on sag ...

引用

IEEE General Meeting power& Energy Society

作者： Guodong Li Gengyin Li Ming Zhou Xiaodong Yang Key Laboratory of Power System Protection and Dynamic Society Monitoring and Control North China Electric Power University Beijing China

ISBN: (纸本)9781424465491

The paper proposes voltage quality service, and makes comprehensive evaluation to sag energy indices to arrive at a quantitative description, then makes differential pricing of voltage quality service combined with market-oriented theory. It puts forward zonal pricing model of voltage quality service based on sag energy indices, as the foundation of comprehensive assessment of power quality and price amendment, and ultimately accomplishes pricing by power quality. It gives raw data according to Monte Carlo simulation, and then proceeds to fuzzy clustering partition of load points. After determining comprehensive weights of districts, it gives assessment value of scoring, and finally designs different correction function to tariff amendment. The simulation results show that the method of tariff amendment proposed in the paper, is applicable to needs of different users with practicality and effectiveness, and is conducive to the development of electricity market.

关键词： Voltage fluctuations Pricing Indexes Electricity Electricity supply industry power quality

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Auxiliary frequency control of HVDC systems for wind power integration

Auxiliary frequency control of HVDC systems for wind power i...

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International Conference on Critical Infrastructures, CRIS

作者： Jing Hu Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

ISBN: (纸本)9781424480807

As a promising renewable resource, wind power is highly expected to contribute a significant part of generation in power systems in the future, but this also brings new integration related power quality issues due to its unconventional characteristics. To solve frequency fluctuating problems of wind power integration, this paper proposes an idea that it is possible and reasonable to use HVDC lines with auxiliary frequency control(AFC) to stabilize the frequency fluctuation caused by wind power, which could increase the rate of wind power integration not only, but also reduce intra-region reserve capacity and wind power cost. Furthermore, an improved frequency control strategy of HVDC is proposed. The simulation results show that the substitution of wind power frequency control reserves with the HVDC connection is possible without additional equipment and without causing large disturbances in both sides.

关键词： Frequency control Wind power generation HVDC transmission Fluctuations Inverters Rectifiers

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Research on the controller and human-computer interface for the voltage disturbance device

Research on the controller and human-computer interface for ...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Shuhong Kong Zhongdong Yin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

ISBN: (纸本)9781424450459;9781424450466

How to solve power quality problems is a research focus recently. It's of great significance to research and design the voltage disturbance device for the voltage compensation device's development and various experimental verifications. The all-digital controller is based on DSP and FPGA. The human-computer interface is designed by LabVIEW, a graphical software development environment most widely used in test, control and design fields currently. LabVIEW program runs on IPC and VISA technology is applied to realize the serial communication with DSP to control the device operation. Menu-driven interface is designed according to a novel design pattern combined with the state machine and the event structure. Based on the data signal processing technology and flexible graphical panel interface of LabVIEW's advantages, voltage disturbance experiments such as the voltage sag and swell, over voltage and under voltage, voltage fluctuation and flicker, voltage unbalance, harmonic and complex disturbances are carried out. In this paper, the working principle and design procedure of human-computer interface are researched. The verification tests are carried out to explain the functions. It's a successful application case of LabVIEW.

关键词： Voltage control control systems Voltage fluctuations Rectifiers power quality Pulse width modulation inverters monitoring Communication system control Digital signal processing power system harmonics

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Design of voltage unbalance generating device based on negative sequence injection method

Design of voltage unbalance generating device based on negat...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Shuhong Kong Zhongdong Yin Chengxin Dai Qiu Hong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

Single-phase large-capacity loads, such as electrified railways, electric arc furnaces, welding machines and so on, will exert influences on the power quality of the power system. As one important problem of them, three-phase unbalance may thereby endanger the safety of various types of electrical equipments. In this paper, reasons and hazards of three-phase unbalance are analyzed. According to the measurement method based on symmetrical components, the three-phase unbalanced generating device is designed. Its main circuit topology is electric power converter of AC-DC-AC with cascaded H-bridge units. The novel method of injecting the negative sequence components is used to simulate voltage unbalance disturbances. The correctness and effectiveness of the device and control algorithms are verified through experiments. This is of great significance for the development of three-phase unbalance compensation device and power quality control equipment and thus to improve the power quality.

关键词： Voltage power quality Railway electrification Rail transportation Furnaces Welding power system analysis computing power system measurements Electrical safety Safety devices

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An improved grey model for forecasting spot and long term electricity price

An improved grey model for forecasting spot and long term el...

引用

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

作者： Zheng, Yanan Li, Gengyin Zhou, Ming Lin, Shan Lo, K.L. 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)9781424459407

With the deepening reform to power industries, power systems are going to gradually open the demand side and the power consumers have to face the changes of their role in the market, and make a preliminary long-term forecasting for the electricity prices. In order to consider the relations between the spot market and the long-term contract market, this paper builds a multi-electricity price grey model to comprehensive forecast the prices of the 2 markets;further researches the structure of the background value, and improves the multi-electricity price grey model;and introduces the residual error, the related grade, the mean variance ratio and the little probability of error as test indexes. The test results show that the multi-electricity price grey forecasting model and its improved model have better accuracy, and the improved model has stronger adaptability and extends the application range. ©2010 IEEE.

关键词： Forecasting

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