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Pacific-Asia Conference on Circuits, Communications and systems, PACCS

作者： Fei Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

A new topological structure of combination switch based reactive power compensation installation is presented in this paper. The new topological structure overcomes those shortcomings of traditional product satisfactorily by take advantage of the features of new system topological structure: concise structure, flexible configuration, high speed communication and powerful capacity of resisting disturbance. The new system topological structure and software program design features of this new installation are described in detail, contrastive analysis and practical test between the new installation and the traditional product are discussed. The results show that the new installation not only has the virtue of: structural standard, simply connection, intelligent identification, easy to extend, high reliability and high power density, but also improves the performance index by means of integrated intelligent control principle and compensation capacity dynamic modification.

关键词： Switches Reactive power ISO standards Reactive power control power system dynamics control systems Communication system control power system reliability Low voltage Access protocols

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Feedback Linearization Based Nonlinear control Strategy of VSC-HVDC

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IFAC Proceedings Volumes 2009年第9期42卷 308-313页

作者： Gengyin Li Ming Yin Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 P.R. China (Tel: +86 10 80798551) State Power Economic Research Institute Beijing 100761 P.R. China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 P.R. China

The model of Voltage Source Converter (VSC) based HVDC in the synchronous dq reference frame is presented in this paper. The model includes the DC link model and the VSC models. The feedback linearization principle for Multi-input Multi-output plants is analyzed. Based on the analysis, nonlinear decoupling control strategies for the two VSCs are proposed. For one VSC, the proposed nonlinear control strategy enables it to decouple DC voltage and reactive power control, and for the other one, the strategy guarantees the control of active power and that of reactive power independently. Simulation was conducted with MATlab/Simulink software to verify the proposed control strategies. The simulation results prove that the nonlinear decoupling control strategies are able to provide good performance.

关键词： Feedback linearization HVDC nonlinear control strategy voltage source converter (VSC)

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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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International Conference on power Electronics and Drive systems (PEDS)

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

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： Finite element methods Magnetic analysis Magnetic fields Inductors power system stability Software prototyping power system analysis computing Lighting control power system control control systems

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

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

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.

关键词： power transmission Voltage power transmission lines Mathematical model Poles and towers Capacitors Electromagnetic coupling laboratories power system protection power system dynamics

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A novel active islanding detection method based on current-disturbing

A novel active islanding detection method based on current-d...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Peng Li Yinbo Sheng Ling Zhang Xilei Yang Yishu Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China Shandong Electric Power Research Institute Jinan China

Desired islanding detection method not only can detect islanding within acceptable duration, but also require it has less adverse impact on power quality. This paper presents an active islanding detection method for a distributed resource (DG) unit which is coupled to a utility grid through grid-connected converter. With the proposed method which is based on adding periodical disturbing current through current controller of the interface voltage-sourced inverter, islanding can be effectively detected. But when the disturbing current remains unchanged, this method still has some shortages, so this article improved it and used a changed time-varying disturbing current ending with faster detecting time and less disturbing. The studies reported in this paper are based on time-domain simulations in the PSCAD/EMTDC environment. And the results show that the proposed islanding detection method always meets the two-second UL detection requirement.

关键词： Voltage control Inverters control systems power systems power conversion Frequency Condition monitoring laboratories power system protection power system dynamics

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Probabilistic estimation of PCC loss due to voltage sags in large power systems

Probabilistic estimation of PCC loss due to voltage sags in ...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

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

ISBN: (纸本)9781424449347

In this paper probabilistic estimation of PCC loss is approached in distribution systems. For the difficulty of directly solving the impedances of the star-connected equivalent model, a port-based model is adopted for voltage magnitude calculation under four fault types (TPF, SLGF, LLF and DLGF). The specific energy (SE) function is used to evaluate voltage sags involving the voltage magnitude and sag duration simultaneously, and PCC loss is directly computed from the trip probability density, which derives from the normal probability distribution function of SE. The distribution characteristic of balanced and unbalanced faults is also considered. The estimation method for PCC loss is proved fast and effective by IEEE RBTS system.

关键词： power quality power systems Voltage fluctuations Circuit faults power system protection power system faults power system simulation power system modeling Impedance Probability

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

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

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.

关键词： EMTDC PSCAD Solar power generation Solar energy Photovoltaic systems Mathematical model Circuit simulation Renewable energy resources Sun Earth

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A method of tracking voltage flicker envelope real-time

A method of tracking voltage flicker envelope real-time

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IEEE General Meeting power& Energy Society

作者： Xiufang Jia Qing Chen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China North China Electric Power University Baoding Hebei China

Fast and accurate tracking of voltage flicker envelope is significant to the performance of flicker meter, flicker source location and the mitigation of voltage flicker. Using the energy of a signal and its shifted signals to track the envelope of voltage flicker is presented in this paper. It is assumed that the signal is shifted, once by a lead angle equal to beta, and at another time by a lag angle equal to beta, which generates two new signals u + (t) and u - (t). According to the energy differences, the relationship between the flicker amplitude and u(t), u + (t), u - (t) can be obtained, so the voltage flicker envelope is successfully tracked. How to obtain the shifted signals u + (t), u - (t) is analyzed in the paper. The frequency error e f (%), amplitude error e m (%) and waveform standard deviation sigma(%) are used as the weighing index of the accuracy of tracking flicker envelope. The theoretical analyzing and RTDS simulation test verify that the suggested method is accurate, fast and anti-noise.

关键词： Voltage fluctuations Frequency Signal analysis Envelope detectors power quality Wavelet transforms Narrowband Filters Blind source separation Noise reduction

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Vulnerability assessment for communication network of Substation Automation systems to cyber attack

Vulnerability assessment for communication network of Substa...

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IEEE PES power systems Conference and Exposition, PSCE

作者： Nian Liu Jianhua Zhang Hao Zhang Wenxia Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Beijing China Automation and information security North China Electric Power University China

The Substation Automation system (SAS) is a crucial element of power system control. The devices of SAS with remote-control functions are one of the main target of cyber attack. The vulnerability assessment for communication network of SASs that supporting the analysis of control process, is an unsolved problem. Combined with the characteristics of SAS and the vulnerability assessment of the distributed systems, a vulnerability assessment method for communication nework of SASs to cyber attack is proposed. The substation communication system has been classified into six basic models used to construct vulnerability state graph (VSG). The vulnerability of single action is defined based on exponential distribution function including parameters called vulnerability factor and equivalent attacking cost, and then the vulnerability value of target systems are calculated by four connection types of VSG. Furthermore, a vulnerability factor quantity method based on AHP-TOPSIS is designed. An evaluation instance is constructed from IEC 61850 standard, the proposed method is applicable to evaluate the vulnerability of communication network of SASs.

关键词： Communication networks Substation automation Synthetic aperture sonar IEC standards power system control Automatic control Process control Communication system control Exponential distribution Cost function

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Notice of Retraction: Research on Cross Cultural Communication and Cultural Instruction of College English Language Teaching

Notice of Retraction: Research on Cross Cultural Communicati...

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International Conference on Industrial and Information systems, IIS

作者： Chengcheng Zhang Fei Wang Foreign Language Teaching & Researching Department Hebei University Baoding China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

This article has been retracted by the publisher.

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