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Research on APFC control for DC storage unit of UPQC

Research on APFC control for DC storage unit of UPQC

引用

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

作者： Li, Peng Bai, Qian Zhang, Tianfeng Sun, Wei Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei China Angang Group New Steel CO.LTD Anshan 114015 Liaoning China

ISBN: (纸本)0863412467

UPQC (unified power quality conditioner), which assembles a series voltage compensator;a shunt current compensator and an energy storage device, is the emerging device of custom power. Multiple power quality regulation functions are implemented in UPQC simultaneously. Synthetic compensating functions of UPQC are explained systematically, and a typical topological circuit of UPQC is proposed. For further improvement of the performance of UPQC, APFC (active power factor correction) is introduced to the DC capacitive voltage control for storage unit of UPQC;moreover its working principle is expounded in detail, simulation results are presented to testify the validity of this approach. It is feasible to apply APFC to the storage unit of UPQC, which makes the performance excellent.

关键词： power quality

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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 ...

引用

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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Perturbed trajectory prediction method based on simplified power system model

Perturbed trajectory prediction method based on simplified p...

引用

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

引用

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 ...

引用

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...

引用

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

引用

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

引用

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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Analysis of ionized field under ±800kV HVDC transmission lines

Analysis of ionized field under ±800kV HVDC transmission li...

引用

17th International Zurich Symposium on Electromagnetic Compatibility, 2006

作者： Tiebing, Lu Jie, Zhao Xiang, Cui Han, Feng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei China Technology Research Center of China Southern Power Grid Guangzhou 510620 Guangdong China

ISBN: (纸本)3952299049

HVDC transmission lines system has some advantages, but it can generate an effect on the environment nearby due to the corona, especially the ionized field. Based on the electromagnetic field theory, a simple method to analyze the ionized field generated from the bundled conductors of bipolar lines is proposed. And then, after the validity of the method is testified, some examples are analyzed and some conclusions are drawn finally. The results have been used in the design of ±800kV HVDC transmission lines system in China.

关键词： Electric lines

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A wide area measurements based global control scheme for improving transient stability

A wide area measurements based global control scheme for imp...

引用

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

作者： Zhang, X.Y. Huang, S.F. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China Si Fang Research Institute North China Electric Power University Beijing 102206 China

ISBN: (纸本)0863412467

In this paper, a global control scheme for improving transient stability of power systems by thyristor controlled braking resistor is proposed. According to the hierarchical control theory of large-scale system principle, the control structure is organized into a two-layer controller. Two-level co- state prediction algorithm is used during optimization of parameters of the controller. The lower layer is composed of decentralized local feedback controllers, each of which takes local feedback signal and controls its connected generator. In the upper layer a global controller is designed to enhance the effectiveness of decentralized local controllers. The global controller coordinates local controllers by generating remote feedback signals which ensuring the global optimal solution of the overall system transient performance. The proposed control scheme can guarantee fast and accurate control actions of local controllers when a power system is subjected to large disturbances. Simulation results show the effectiveness of the proposed control scheme.

关键词： controllers

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