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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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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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Analysis of ionized field under ±800kV HVDC transmission lines

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

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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...

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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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Study on the control of DFIG and its responses to grid disturbances

Study on the control of DFIG and its responses to grid distu...

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2006 IEEE power Engineering Society General Meeting, PES

作者： Ming, Yin Gengyin, Li Ming, Zhou Guoping, Liu Chengyong, Zhao IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Shijiazhuang Electricity Company Shijiazhuang 050051 Hebei Province China

ISBN: (纸本)1424404932

The paper presents the dynamic model of doubly fed induction generator (DFIG) including the mechanical model, the generator model and the PWM voltage source converter model. The mechanical model uses two-mass model, and the generator model includes both the stator side and the rotor side dynamics. The PWM voltage source converter is modeled as an average model in which the action of power electronic switches is neglected. The paper features vector control of DFIG. On the rotor side converter, the control scheme enables the independent control of speed and reactive power from the stator. On the grid side converter, the control scheme is implemented to regulate the DC voltage and reactive power from the grid as well. In order to study the influence of the grid disturbances on the DFIG, grid voltage dip and quick frequency change are simulated with the engineering software, MATLAB/Simulink. Meanwhile, in the paper the pole-placement method and internal model control method are implemented for designing the PI controllers. © 2006 IEEE.

关键词： Asynchronous generators

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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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ATSC dynamic reactive power compensation device and its effect on improving the power quality

ATSC dynamic reactive power compensation device and its effe...

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

作者： Li, Peng Zhang, Tianfeng Bai, Qian 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

A method of the thyristor rapi switched capacitors is presented in this paper, which breaks through the bondage of the conventional methods. In addition, a novel algorithm of two time reactive power has been presented, with which reactive power can be calculated fast. Meanwhile, with microcomputer synchronous phase lock technology, quick switching without transition can be realized, dynamic reactive compensation for impact load can be achieved, and the total response time is shorter than 16 ms. This technology not only can compensate reactive current dynamically but also can improve the voltage waveform to a certain extent. In the end, the type test waveforms and the users' field test waveforms are given to show the validity and effectiveness of this technology. This method is an effective way to improve power quality.

关键词： Thyristors

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