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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Ao-Yang, Han Zhe, Zhang Xiang-Gen, Yin Key Laboratory of Power System Protection and Dynamic Security HuaZhong University of Science and Technology China

ISBN: (纸本)9781424424870

Recent years, more and more wind power plants with the doubly-fed induct generation (DFIG) are built in China. With the development of the distributed sources, it was critical to present the new protection schemes and the key point is understands the characteristics of DFIG fault current. Because the complex in the generator's structure, the related references about this topic were relatively less. The DFIG generator has a three-phase wound rotor, which was supplied by a pulse width modulation (PWM) converter. When a fault occurs, the transient process was not only determined by machine itself but also the outer exciting system. So the waveform of fault current has variety. Only use the theory analysis was hard to describe the characteristic of fault current. The author adopt the simulation method combined theoretical analysis to investigate short-circuits current. In order to delineate various waveforms of current accurately, the emphasis lay on building the whole system model completely and precisely. This paper first analyzed the component of fault current in theory, and then built the specific model of rotor side exciting PI controllers and the active crowbar protections. Based on the various fault current waveforms, the characteristic of fault current were presented at last. © 2009 IEEE.

关键词： Wind power

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New research advancement in electrical engineering field of China-Reviews on special issue of Science in China Series E:Technological Sciences

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Chinese Science Bulletin 2009年第8期54卷 1285-1286页

作者： MEI ShengWei MA Jin State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing 100084 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing 102206 China

Based on,but not limited to the research results of electrical engineering published in the special issue of Science in China Series E,June 2008,this essay gives a brief review on a wide range of state-of-art advancement in electrical engineering field of China,which includes power system modeling,analysis and control,risk assessments in power system,etc.

关键词：电气工程工程领域技术科学电力系统研究成果中国科学系统建模风险评估

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Characteristic analysis of UHV secondary arc current under different power transmission

Characteristic analysis of UHV secondary arc current under d...

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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Zhou, Lixia Zhang, Huiyuan Wen, Jun Xiao, Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring North China Electric Power University Beijing China

ISBN: (纸本)9781424424870

Along with the enhancement of voltage level, harmful affect of the secondary arc current to the system becomes more and more serious. The transmission power of the lines is one of factors that influence the secondary arc current obviously. The voltage distribution along the transmission line will changes according to the different transmission power, which will lead to the variation of the induction component from the sound phases when the fault occurs. In this paper, the quadric-mode transformation is adopted to establish the mathematic model of secondary arc current in the double-circuit transmission line. According to the variation of power transmission, the secondary arc current of different fault point is calculated. The results indicate that secondary arc current is influenced much by the line transmission power, and the variation trend changes along with the fault point. When the fault occurs in head or terminal of the line, the secondary arc current may becomes larger along with the increasing of the transmission power, thus effective suppress measurements must be taken. © 2009 IEEE.

关键词： power transmission

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The finite elements analysis on magnetic field of controllable saturated reactor

The finite elements analysis on magnetic field of controllab...

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2009 International Conference on power Electronics and Drive systems, PEDS 2009

作者： Ziqiang, Wang Zhongdong, Yin Po, Yang Ke, Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

ISBN: (纸本)9781424441662

In the power system, the controllable reactor can be used as reactive power compensation device to limit over-voltage operation, reduce no-load or light load loss and improve transmission capacity. It is with characters of simple structure, easy maintaining, low cost and high stability, etc. The magnetic field is closely related to the reactor performance. In this paper, aiming at a controllable saturated reactor prototype, using the finite elements method, the magnetic field is studied. Then, the precise 2-D prototype field-circuit coupling model is established based on the magnetic field analysis and the finite element analysis software - ANSYS. Using this model, the magnetic field and working currents concrete values under the condition that AC and DC excitations co-exist within the core are calculated. The analysis results indicate that finite element analysis theory can effectively analyze the magnetic field of the reactor.

关键词： Magnetic fields

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Simulation research on the multiple objective voltage quality regulator

Simulation research on the multiple objective voltage qualit...

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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Di, Yajing Yin, Zhongdong Xiao, Xiangning Zhang, Zhi Key Laboratory of Power System Protection and Dynamic Monitoring Control Under Ministry of Education University Beijing 102206 China Key Laboratory of Power System Protection and Dynamic Security Monitoring Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424424870

Due to the complexity of power systems combined with other factors such as increasing susceptibility of equipment, power quality (PQ) is apt to waver. With electricity in growing demand, low PQ is on the rise. the method of resolve those problem about power quality must be considered. In accordance with the familiar PQ problem, such as voltage sag, voltage swell, short interruption of supply voltage, harmonic suppression and short circuit fault. Basing on the H bridge cascade connection method, this paper design a new type regulator for the multiple objective control. Through the simulation software of PSCAD/EMTDC, the device can resume the voltage and restrain the harmonic dynamically and effectively, when there are voltage disturbances in the power system side. This device also could confine the short circuit current to a supportable level, when there is short circuit fault in the load side. This work was supported by Project Supported by National Mega-projects of Science and Technology for the 11th Five-year Plan (2007BAA12B03). © 2009 IEEE.

关键词： power quality

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Governor-side damping controller for power systems based on PMU'S data with time delay

Governor-side damping controller for power systems based on ...

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IASTED International Conference on Modelling, Simulation, and Identification, MSI 2009

作者： Xue, Ancheng An, Pinghua Bi, Tianshu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9780889868106

Low frequency oscillation (LFO) is harmful to power system security and stability. The traditional solutions for LFO are the power system stabilizers (PSSs) with local signals implemented on the excitations. This paper explores the governor-side damping controllers for LFO with wide area measurement system (WAMS). Design strategy of governor-side damping controller using remote signals from WAMS with time delay is proposed based on the partial state feedback theory, the time delay is dealt with the Pade approximation. Simulation results in a 2-area 4-generator power system show the effectiveness of the proposed governor-side damping controller.

关键词： Electric power system measurement

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Effect of wind farm based-on wound rotor induction generator on transient characteristics of transmission grid

Effect of wind farm based-on wound rotor induction generator...

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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Lin, Li Sun, Feng Yang, Yihan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing China

ISBN: (纸本)9781424424870

With rapid development of wind power generation, large capacity wind farms are connected into the transmission system. Comparing with traditional power plant, the transient characteristics of transmission grid including wind farm are worthy investigating. The wind farm based-on wound rotor induction generators (WRIGs) shares high market occupancy in China, but academic researches on this grid-connected wind generation are few. So in this paper, the transient characteristics of the power system, adding a WRIGs wind farm and adding a traditional power plant, are compared. Effect of a WRIGs wind farm on transient performances of transmission grid is discussed. And the control effect on transient stability, when the WRIGs wind farm participating in system control during system fault, is investigated. Finally, simulation results are validated by using CIGREB4-39 grid. It is concluded that the transient performance of WRIGs wind farm is better than that of traditional power plant. © 2009 IEEE.

关键词： Wind farm

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A novel voltage balance control strategy of AC-DC-AC converter

A novel voltage balance control strategy of AC-DC-AC convert...

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2009 International Conference on Energy and Environment Technology, ICEET 2009

作者： Yang, Zhang Yin, Zhong-Dong Tao, Huang Qiu, Hong Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9780769538198

A general problem in the double PWM converter is the voltage unbalance of the dc-link capacitors. This unbalance distorts the waveforms of the output voltage and current. Furthermore, it will lead to instability of the inverter system. Based on the analysis for the unbalance problem, a novel feedback control strategy of DC capacitor voltage deviation is proposed in this paper. The method does not add extra circuit. Build an simulation model of AC-DC-AC converter, the results show that control strategy is correct. © 2009 IEEE.

关键词： Pulse width modulation

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Information entropy based fuzzy optimization model of electricity purchasing portfolio

Information entropy based fuzzy optimization model of electr...

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2009 IEEE power and Energy Society General Meeting, PES '09

作者： Yanan, Zheng Ming, Zhou Gengyin, Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9781424442416

With the development of electricity demand side market, large consumers have more electricity purchase choices, in the same time have to face the risk of electricity price fluctuation on different markets. In order to measure and hedge the risk reasonably, this paper introduces information entropy as the measure to risk in electricity purchase, by aid of fuzzy optimization, linear membership function is adopted and the optimal electricity purchasing portfolio model is established according to the given expected target and tolerance. Test results show that information entropy can overcome lots of shortages in the method that adopts variance as risk measure;the electricity purchase strategy given by fuzzy optimization has good consideration both on price and risk. ©2009 IEEE.

关键词： Sales

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Design of PV array model based on EMTDC/PSCAD

Design of PV array model based on EMTDC/PSCAD

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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Xue, Jinhui Yin, Zhongdong Wu, Bingbing Peng, Jun Key Laboratory of Power System Protection and Dynamic Security Monitoring Control under Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424424870

Along with consuming of fossil energy step by step, crisis of energy has been appeared. The solar energy, which is endless, is a kind of renewable energy. Radiation of sun coming to earth in a day is equal to the energy, which is released by trillion buckets of oil. The research of solar energy generation has stepped into a very activity period. This paper analyses the physics characteristic of photovoltaic array firstly, then researches the mathematical model applying in engineering, and designs the total simulation model based on power electronic circuit in the end. In order to validate the correctness and validity, this paper makes a simulation as an example. The scheme can express the V-I characteristic of photovoltaic array very well. © 2009 IEEE.

关键词： Solar energy

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