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IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Yi, Wang Heming, Li Xinchun, Shi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 619 Yonghua North Street Baoding 071003 China

ISBN: (纸本)1424401364

Direct torque control (DTC) has achieved utilization on two-level inverters and three-level diode-clamped inverters, and it has high performance of speed control. But DTC hasn't been utilized to cascaded multilevel inverters at present. In this paper, a novel space vector modulation (SVM) approach for cascaded multilevel inverters is presented firstly. Then by combining it with the DTC approach based on SVM, the approach of using DTC to cascaded multilevel inverters is presented. And it is verified by using a three-cell cascaded frequency control laboratory system. The proposed approach solves the issues that switching state table is difficult to generate and switching frequency is not fixed, which is arisen from using conventional DTC to cascaded multilevel inverters. It will be of benefit to the utilization of DTC on the speed control of induction motors fed by cascaded multilevel inverters. © 2006 IEEE.

关键词： Induction motors

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A new method of transformer monitoring on-line based on acoustic wave analysis

A new method of transformer monitoring on-line based on acou...

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2006 China International Conference on Electricity Distribution, CICED 2006

作者： Zhao, Shutao Yan, Jiawen 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

With the electrical load increasing rapidly, the fault probability of power equipment is also rising greatly. This paper put forwards a new method of monitoring transformer-running state based on acoustic wave analysis. Firstly, the acoustic wave signal of the transformer running is collected by the system on chip (SOC) microcomputer. Then the signal is stored by a high-capacity secure memory (SD) card. The sound intensity and spectrum of acoustic wave is different when the power transformer running between normal and abnormal condition. Finally, the fuzzy algorithm is utilized to analyze the state of transformer. It is proved that the monitoring system based on acoustic wave analyzing can find the transformer's incipient fault on-line, and the transformer running safety and reliability can be assurance effectively.

关键词： system-on-chip

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Real-time running state monitoring of power equipment based on image recognition

Real-time running state monitoring of power equipment based ...

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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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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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Study on control Strategies to Improve the Stability of Multi-Infeed HVDC systems Applying VSC-HVDC

Study on Control Strategies to Improve the Stability of Mult...

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Chengyong Zhao Ying Sun Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control under Ministryof Education North China Electric Power University Baoding Hebei China

Against the stability of the multi-infeed HVDC (MIDC) transmission system, voltage source converter based HVDC (VSC-HVDC) is applied to MIDC systems. The new systems can reduce probability of commutation failure and improve the stability of the MIDC systems. A physical model of a multi-infeed HVDC and VSC-HVDC system is developed, and its mathematical model is analyzed. The rectangular coordinate form of VSC's power transmission equations is deduced through coordinate conversion. Based on the inverse system method for multivariable nonlinear control, the nonlinear controllers of the multi-infeed HVDC and VSC-HVDC system are designed. Simulation results by PSCAD/EMTDC show that the designed nonlinear controllers improve effectively the voltage stability of the multi-infeed HVDC and VSC-HVDC system under small or large disturbances, such as short circuit fault, reduce the probability of commutation failure in the inverter of HVDC systems and increase the operation reliability of HVDC systems

关键词： control systems Stability HVDC transmission Converters Power conversion Nonlinear control systems Mathematical model Voltage Power system modeling Power transmission

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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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