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2006 China International Conference on Electricity Distribution, CICED 2006

作者： Zhao, Shutao Zhu, Xiaohui Li, Baoshu Niu, Wendong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 China Shandong Electric Power School Tai-an 271000 China

ISBN: (纸本)0863416381

It is a new method that monitoring the power equipments state based on image analyzing, and it can improve the automatic level of power system. Not only the video frequency would be monitored and recoded, but also the images analyzing and recognizing can be done, and it leads the incipient fault to be discovered on-line. The computer captures remote equipments images, calculates images' moment invariants as characteristic vector of recognition, recognizes power equipments by support vector machine (SVM). The system further analyzes images and find if images has convex hull, intensive stochastic noise, or false edges, sequently make a conclusion whether the running state of equipments is in order. Replace of scouting by people themselves, the use of image recognition in power system can timely find troubles and potential troubles of power equipments. So the power equipments can be inspected and maintains its working state, which would improve the running reliability of the unattended substation.

关键词： Image recognition

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Perturbed trajectory prediction method based on simplified power system model

Perturbed trajectory prediction method based on simplified p...

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2006 IEEE PES power systems Conference and Exposition, PSCE 2006

作者： Song, F.F. Bi, T.S. Yang, Q.X. Si Fang Research Institute North China Electric Power University Beijing 102206 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing 102206 China

ISBN: (纸本)142440178X

With the interconnection of power grid, the postdisturbance system is easier to suffer power-angle swing and system oscillation. Moreover, the impact of load characteristics on the system dynamic behavior becomes more obvious. Therefore a new perturbed trajectory prediction method considering load model is presented in this paper. A static load model with voltage characteristics in stead of pure impedance is introduced into the system models. The admittance matrix including load nodes and a coefficient matrix of load proportion are figured out based on the real-time data from WAMS (Widearea measurement system). Using the sensitivity equation of power flow, the linear relationship between the micro variation of electromagnetic power and that of rotor angle is deduced, and then a new perturbed trajectory prediction algorithm is proposed. Numerical simulation results on the IEEE-9 bus system show that the proposed method works well. © 2006 IEEE.

关键词： Forecasting

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Development of the DSP-based digital flickermeter

Development of the DSP-based digital flickermeter

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2006 China International Conference on Electricity Distribution, CICED 2006

作者： Zhou, Guoliang Shi, Xinchun Fu, Chao Wang, Jian Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 China Baoding Sanyi Fortune Power Electronics Company Baoding 071000 China

ISBN: (纸本)0863416381

In order to develop the IEC standard based flicker meter, analog model of the flicker meter is developed by Matlab according to the functions and design criterion suggested by IEC. After making certain the analog model parameters and the sampling frequency, bilinear transformation is adopted to converte the analog model to digital system. DSP-based digital flicker meter is developed based on the simulation results, and it is proved to be high-precision by simulation and experimental results. It can match the precision requirement of IEC standard.

关键词： MATLAB

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High frequency reversible rectifier based energy extraction of dynamic voltage restorer

High frequency reversible rectifier based energy extraction ...

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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Yin, Zhongdong Shu, Qing Huang, Yuanyan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Department of Electric Engineering North China Electric Power University Beijing China

ISBN: (纸本)0863412467

Energy extraction and control of dynamic voltage restorer (DVR) have been warmly discussed. This paper presents and studies high frequency reversible rectifier based energy extraction of DVR. Researches three operating modes of rectifier and its control under system balance, single phase voltage sag, regeneration three conditions based on simulation. Results verified the correction and validity of presented control strategy and algorithm.

关键词： Electric rectifiers

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A novel transient stability analysis method for multi-machine system

A novel transient stability analysis method for multi-machin...

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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Song, F.F. Bi, T.S. Yang, Q.X. Si Fang Research Institute North China Electric Power University China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China

ISBN: (纸本)0863412467

With the development of grid- interconnection and the commission of power electronic devices, the dynamic behaviors of power systems become more and more complex. Once there is a disturbance, large area of outages might be occurred without effective transient stability analysis and control methods. The advent of WAMS gives a new way to transient stability analysis. In this paper, a new criterion of transient stability assessment is proposed based on COI system. Finally, numerical simulations are conducted on IEEE-9 bus system to demonstrate the effectiveness of the criterion.

关键词： Transient analysis

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The structure and application of flexible SCADA

The structure and application of flexible SCADA

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2006 IEEE power Engineering Society General Meeting, PES

作者： Haijing, Yang Yihan, Yang Dongying, Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Department of Electrical Engineering North China Electric Power University Zhuxinzhuang Dewai Beijing 102206 China

ISBN: (纸本)1424404932

This paper put forward to an interactive flexible SCADA system in which information shared, on the basis of analyzing and summarizing the defections of former SCADA. It not only solves the interaction of data and function in the information islands, but also solves functions coordination and data exchange of distributed application system in different location. The paper proposes the concept of general data acquisition, discusses the structure and the ways of technology support, and describes the application of flexible SCADA based on the example of fault decision support system (FDSS). This proposal flexible SCADA extends and develops the data source of traditional SCADA and enriches the data foundation for power system advanced analysis software. ©2006 IEEE.

关键词： SCADA systems

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An intelligent distribution network planning based on GIS

An intelligent distribution network planning based on GIS

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2006 China International Conference on Electricity Distribution, CICED 2006

作者： Liu, Jun Yu, Han Zhang, Jianhua Yuan, Qihong Qian, Qi Shang, Jingfu Li, Sheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China Department: Electric Power Engineering North China Electric Power University 102206 China

ISBN: (纸本)0863416381

Distribution network planning is a multi-goal and multi-restricted problem that involves the geographical condition of power line route, constructing and maintenance expenses, power line losses, power flow and security constraint. Computer aided planning is an important studying direction now. However, automatic line routing can not be made now. A model is advanced in this paper to minimize the work of planner and to simplify the network planning procedure. In this paper, an improved particle swarm optimization (PSO) is used to escape the locally point by adopting the probability distribution feature and controlling the flying speed automatically. By using this method in Jinan power network, found that the speed of network-planning can be improved by adopting the improved PSO and geographical feature pretreatment.

关键词： Geographic information systems

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Study on WAMS based multi-swing stability assessment for power systems

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2006年第16期26卷 38-45页

作者： Song, Fang-Fang Bi, Tian-Shu Yang, Qi-Xun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under North China Electric Power University Changping District Beijing 102206 China

With the increasing of grid-size, the problems of power system stability become more and more prominent. Meanwhile, it is very urgent to achieve quantitative stability analysis for the operation of electricity market. The advent of WAMS (wide area measurement system) provides a new way for studying multi-swing stability of power system. In this paper, a curvature vector of an electric machine kinetic energy-power angle curve is defined firstly, and then the relationship between the defined curvature vector and the corresponding individual machine stability is analyzed. The validity of the relationship is proved in detail. Therefore, the curvature vector of kinetic energy-power angle curve as a new stability assessment function is proposed. A new criterion of stability assessment based on WAMS is proposed. Numerical simulations are conducted on IEEE-9 bus system and 6 machines-22 bus system of China EPRI to demonstrate the effectiveness of this criterion.

关键词： Electric power systems

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Assessment of power system black-start plans based on analytic hierarchy process and data envelopment analysis

Assessment of power system black-start plans based on analyt...

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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Liu, Yan Gu, Xue-Ping Zhang, Dan Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Dispatching Center of Yunnan Power Company Kunming 650011 China

ISBN: (纸本)0863412467

Reasonable black-start plans are necessary for restoring the power system quickly. Based on analytic hierarchy process (AHP) and data envelopment analysis (DEA), a novel strategy for assessing black-start plans is proposed in this paper. First, the objective and requirements of restoration are analyzed thoroughly. So, assessment hierarchy is divided appropriately through employing AHP and the relative importance of assessment criteria is identified. Secondly, plans are compared with regard to different assessment criteria by means of DEA. Finally, plans are assessed comprehensively through integrating results of first two steps. The application to a practical power system verifies that the strategy could provide dispatchers more exact decision references.

关键词： Analytic hierarchy process

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Damping characteristic research of complex electric power system with several kinds of controllers

Damping characteristic research of complex electric power sy...

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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Ma, Yanfeng Zhao, Shuqiang Yi, Yu Key Laboratory of Power System Protection North China Electric Power University Dynamic Security Monitoring and Control under Ministry of Education Baoding 071003 Hebei China Chengdu Technical College of Electric Power Chengdu 610072 Sichuan China

ISBN: (纸本)0863412467

There are many PSS and additive damping controllers of FACTS in modern power systems. As the interaction among controllers is important to power system stability, the damping characteristic study of such system with multicontroller is necessary. In this paper the AC/DC mixed power system with PSS, DCM and additive damping controller of TCSC is analyzed by the signature analysis method, the damping characteristic of complex power system is gained and the effect of adjustable parameter of controllers on damping and the interaction among controllers are studied. The conclusions we have drawn will have important guiding significance to the coordination and stability control.

关键词： Damping

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