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Power Tech Conference

作者： Ma Jin Han Dong He Renmu Dong Zhaoyang David J. Hill Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China School of Information Technology and the Electrical Engineering University of Queensland Saint Lucia QLD Australia Department of Information Engineering Australian National University Australia

Load modeling is very important for power system dynamic analysis and control. The composite load model widely applied recently in the power system operation centre consists of the static load and the equivalent motor. Current practices in measurement-based load modeling identify all the parameters in this composite load model. However, it is not clear whether all these parameters could be identified from the measurements. This paper investigates the identifiability of the equivalent motor parameters in the composite load model. Trajectory sensitivity approach is applied first to find the motor parameters that have great effects on the measured active as well as reactive load dynamics. The analysis results show that the motor outputs have various sensitivities with respect to the parameters. Since the voltage disturbance, the active load and the reactive load dynamics are applied to identify the motor parameters, those parameters affecting the measurements to a great extent are observable, thus identifiable from the measurements; while those that have little effects on the motor outputs are unobservable from the measurements and consequently unidentifiable. The case studies verify the identifiability of the motor parameters.

关键词： Load modeling Power system modeling Power system dynamics Power system simulation Power system stability Power system analysis computing Power system measurements Voltage Power system control Power systems

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Preparation of TiO_x Films by Cathode Multi Arc Ion and Its Performance

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兰州交通大学学报 2007年第6期26卷 163-164页

作者： Fan Duojin Fan Duowang Wang Chenglong Liu Hongzhong Lanzhou Dachen Automatic Control System Co. Ltd Lanzhou 730070 China key Laboratory of Opto-Electronic Technology and Intelligence Control Ministry of Education Lanzhou Jiaotong University Lanzhou 730070China State Key Laboratory for Manufacturing Systems Engineering Xi＇an Jiaotong University Xi＇an 710049 China

Experimental Procedure Fig.1 shows the custom-made Cathode Multi Arc Ion equipment,which is made up of three pars:CCS (computer contral system,Fig.1′s left part),Vacuum Chamber (Fig.1′s middle part) and Air Pump par... 详细信息

关键词：钛氧化物薄膜阴极多相电极离子制备性能

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Speed sensorless control with neuron MARS estimator of an induction machine

Speed sensorless control with neuron MARS estimator of an in...

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2006 2nd International Conference on Power Electronics systems and Applications, ICPESA

作者： Lei, Dong Dong, Yang Xiaozhong, Liao Department of Automatic Control Engineering Beijing Institute of Technology Beijing China Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing China

ISBN: (纸本)9623675445

In the high speed range, vector control of rotor flux orientation of an induction machine implements good perfornance. However, the perfornance in low speed rang deteriorates because of the inaccurate estimation of rotor flux and speed. In this paper, modified voltage model for rotor flux estimation and neuron model-reference adaptive system (MARS) for speed estimation are used to improve the perfornance of speed sensorless vector control. To improve the accuracy of rotor flux estimation, the stator resistance is identified on-line. The experimental results show that the proposed scheme yields improved perfornance in low speed range.

关键词： Induction machine

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Numerical prediction of EMI on the secondary DC cable in cable tunnel due to a direct lightning strike in substation

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IEEE TRANSACTIONS ON MAGNETICS 2006年第4期42卷 863-866页

作者： Lei, Q Xiang, C Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education School of Electrical Engineering North China Electric Power University Hebei 071003 China

Electromagnetic interference (EMI) on secondary de cable in cable tunnel due to a direct lightning strike in substation threatens the safe operation of electronic equipment and system connected to the cable. In order to reduce EMI, the cable shield is generally connected to the grounding grid at both ends. Ground potential difference between two grounding points of the cable shield can be high due to high impedance of the grounding grid at high frequencies. In this paper, we present a hybrid method to analyze this complex system. As a result, both the current flowing in the cable shield and the transverse voltage between the cable core and shield are calculated. Compared with the measured results, the proposed method is demonstrated to be correct and effective.

关键词： electromagnetic interference (EMI) grounding grid in substation lightning secondary cable

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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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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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User-defined HVDC reactive power control modeling for system stability studies in PSASP

User-defined HVDC reactive power control modeling for system...

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

作者： Ding, Hui Han, Minxiao Xu, Decao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Changping District Beijing 102206 China School of Electrical Engineering North China Electric Power University Beijing 102206 China

ISBN: (纸本)0863412467

A detailed user-defined (UD) reactive power control (RPC) model of HVDC has been developed in Power system Analysis Software Package (PSASP). The UD RPC model, as one part of UD HVDC models which have been set up based on the control system of Three Gorges-Changzhou project, includes reactive power generation calculation, reactive power consumption calculation, reactive power control strategies and converter reactive power regulator strategies. Each part of the UD RPC model and its guidelines are presented in this paper. Case studies are carried out on the WEPRI-7 system whose embedded HVDC models are replaced by the UD HVDC models. The simulation results show the correctness and necessity of the UD RPC model for AC/DC hybrid system interaction and stability analysis.

关键词： Reactive power

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A survey on new methodologies and implementation strategies in bulk power system restoration

A survey on new methodologies and implementation strategies ...

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

作者： Liu, Qiang Zhou, Ming Li, Gengyin Ni, Yixin 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 Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0863412467

The research on the methodologies and implementation strategies in bulk power system restoration after a partial or complete collapse is of great significance. This paper provides the survey on the recent developments of restoration methodologies and implementation strategies. And many new ways to form a power system restoration plan and how to deal with the sub-problems encountered during the restoration process are summarized and introduced. Also, the future work are presented, such as, how to consider the AC/DC hybrid system in the restoration process, how to utilize the distributed generation (DG) and how to use the wide-area measurement system (WAMS) for restoration.

关键词： Restoration

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The intelligent research of image recognition used for unattended substation

The intelligent research of image recognition used for unatt...

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2006 China International Conference on Electricity Distribution, CICED 2006

作者： Yang, Jun Ai, Xin Jia, Xiufang Li, Yansong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Deshengmenwaizhuxinzhuang Beijing 102206 China Electric Power Company Jinzhou Engineering Technology Department Liaohe Petroleum Exploration Bureau Liaoning Province Linghai 121209 China

ISBN: (纸本)0863416381

It is a trend to construct unattended substation in power system *** paper systematically analyses the superiority and limitation of MATLAB and Visual C++ and illustrates how to compile m-files to cpp-files by MATLAB engines and integrate cpp-files code into existing C++ projects by Visual C++ to realize intelligent function on image recognition used for unattended *** intelligent function can effectively test illegal intrusion and fires through the detection and recognition of moving goals by three-image difference method and self-adapting threshold value segmentation algorithm and detect situations of disconnection link by use of image crop and image index processing and give warnings to alarm system. Because of lacking of brightness of image or nonlinear brightness and being influenced by kinds of noise,this paper determines to adopt contrast enhanced algorithm and high-frequency enhanced algorithm to repair grey-scale distribution and uses median filtering to remove noise of image. In the end,this paper brings forward the expectation about the image recognition of the unattended substation. When non-uniform of image illumination distribution, grey-scale of background changes largely and image segmentation has not the fittest threshold, so the paper uses self-adapting threshold segmentation algorithm to gain the image segmentation.

关键词： Image segmentation

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