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11th International Conference on Electrical Machines and systems(第11届国际电机与系统会议)

作者： Xinchun Shi Guoliang Zhou Chao Fu Weiwei Ma Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry

This paper introduced a real-time digital modeling approach for Electrical Arc Furnace (EAF) based on recorded field data. The model equaled the arc furnace to a current source controlled by the field data, and via adopting a phase locked technique, the synchronization between simulation and field data was performed, which made a long time real-time simulation possible. Besides, the model was used for evaluating the performance of SVC system which contributes to compensate Var and mitigate the harmonic and flicker caused by EAF. The simulation was implemented on the Real Time Digital Simulators (RTDS) and the results of simulation illustrate that the proposed EAF model and evaluation system can be used for testing a physical control system of SVC system and evaluating the control strategy.

关键词： arc furnace recorded field data real time digital simulation model close loop test

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dynamicAL COMPLEXITY OF A TYPICAL NONLINEAR system

DYNAMICAL COMPLEXITY OF A TYPICAL NONLINEAR SYSTEM

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2008 International Conference on Machine Learning and Cybernetics(2008机器学习与控制论国际会议)

作者： YA-GANG ZHANG ZENG-PING WANG HUI-FENG SHI XIAO-KUN WU Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry

The dynamical complexity of a typical nonlinear system will be clarified in this paper. These stochastic symbolic sequences bear three features. The distribution of frequency, inter-occurrence times, the first passage time and the r-th passage time are discussed carefully. Especially, one introduces ordinal passage time and gives certain distribution functions in this typical nonlinear system. Finally, the visitation density function is obtained by Frobenius-Perron(F-P) operator P.

关键词： dynamical complezity Nonlinear system The first passage time Visitation density

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Validation of measurement-based load modeling for large-scale power grid

Validation of measurement-based load modeling for large-scal...

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IEEE power and Energy Society 2008 General Meeting: Conversion and Delivery of Electrical Energy in the 21st Century, PES

作者： Yanhui, Xu Renmu, He Dong, Han 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)9781424419067

For a large-scale power grid, how to obtain load model for the substation without load characteristics recorder is the problem facing measurement-based load modeling. The feasibility that the measurement-based load model of a substation is applied to every substation was studied in this paper. The simulation results indicate that it is not feasible. Consequently, two methods were adopted to solve the problem. One method is that all substations were classified into several groups and then the measurement-based load model of a substation in every group was applied to the substations of its group. The other method is to get the base vectors of load model parameters and then obtain the load model parameters of all substations based on aggregation theory. The above two methods are validated in the practice of Northeast China power Grid load modeling. This has important significance for generalizing measurement-based load modeling to large-scale power grid. © 2008 IEEE.

关键词： Electric power transmission networks

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Recent progress and future perspective on condition monitoring and diagnostic techniques for power equipments in China

Recent progress and future perspective on condition monitori...

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2008 International Conference on Condition monitoring and Diagnosis, CMD 2008

作者： Li, Chengrong Tang, Zhiguo Zheng, Zhong Beijing Key Laboratory of High Voltage Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424416219

under the general backgrounds of fast development of economy, China' power industry is undergoing a new upsurge of infrastructure construction. With the urgent need of the whole society for reliable power supply, Condition Based Maintenance strategy is becoming the mainstream of the operation and management of the power system. In this paper, recent progress of Condition monitoring and Diagnostic technologies for major power apparatus are reviewed. Also, some statistical data on practical on-line monitoring applications in China are introduced. At last, the key problems and trends of CMD are discussed with a viewpoint future perspective. ©2007 IEEE.

关键词： Condition based maintenance

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Eigenvector selection in load classification and model generalization

Eigenvector selection in load classification and model gener...

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3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Zheng, Xiao-Yu Jin, Ma. He, Ren-Mu IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China

ISBN: (纸本)9787900714138

It has been well recognized that the load model has great effects on the power system analysis and control. However, it is also widely known that the load modeling is a quite difficult problem due to its special properties such as time-variant characteristics of the load. In this paper, the measurement-based load modeling approach and multi-curve identification technique are applied in Hushitai power station in Northeast China. In order to build practical load models that can describe the actual load characteristics without changing the model parameters too often, cluster analysis is used to classify the loads. Two main kinds of eigenvectors used in cluster analysis are also compared. Finally, based on the load classification, a new aggregation method is proposed to build load models with good generalization capability. Case studies show the efficiency of the proposed method. © 2008 DRPT.

关键词： Cluster analysis

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Study on improvement of available transfer capability by demand side management

Study on improvement of available transfer capability by dem...

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3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Ming, Zhou Yajing, Gao Gengyin, Li IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9787900714138

Demmand Side Management (DSM) is now an important consideration for electric power utilities. DSM in general refers to any activity adopted by an electric utility that ultimately changes the utility's system load curve. Enhancing the DSM activities could help not only the system operate more efficiently, but also benefit the system Available Transfer Capability (ATC). This paper presents an integrated framework for evaluating impacts of DSM on ATC. A set of load management models for peak clipping/shifting and valley filling, strategic conservation and strategic load growth are presented. Composite DSM actions in the power system's diverse areas are also modeled. ATC evaluation procedure incorporated with DSM resources is given in sequential Monte Carlo simulation. The Liner-programming based ATC calculation model and time-varying load curves are employed to calculate ATC indices. The IEEE-RTS79 is used to illustrate the proposed approach and implement comparisons of impacts with and without DSM activity on ATC indices. © 2008 DRPT.

关键词： Demand side management

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Nonlinear PID controller of H-bridge cascade SSSC top level control

Nonlinear PID controller of H-bridge cascade SSSC top level ...

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3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Zhao, Yang Xiao, Xiangning Xudong, Jia IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9787900714138

As a series FACTS device based on Voltage Source Converter (VSC), Static Series Synchronous Compensators (SSSC) can optimize power flow and improve power system stability by controlling the line impedance rapidly. According to the three levels control structure of SSSC proposed in this paper, when SSSC middle level control operates at constant impedance mode, it has characteristic of controllable impedance as viewed from the top level. In this paper, the output of SSSC is equivalent to controllable impedance and then affine nonlinear equation of the single machine infinite bus (SMIB) power system including a SSSC can be obtained without the compound coordinate transformation approach which is proposed by other documentation and the feedback exact linearization method can be used directly to obtain the SSSC top level nonlinear controller. For avoiding solving the partial differential equation, the direct method is used to realize the exact linearization simply and conveniently. For overcome the shortcoming of low robustness of exact feedback linearization approach due to uncertainty of parameters and model of controlled system, the nonlinear PID control is used to design the SSSC top level controller. Finally the paper applies Real Time Digital Simulator (RTDS) to validate the feasibility of the proposed modeling and control approach in damping out power system oscillations. © 2008 DRPT.

关键词： Nonlinear equations

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Comparison between Hilbert space based power theory and Traditional power theory

Comparison between Hilbert space based power theory and Trad...

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2008 Joint International Conference on power system Technology powerCON and IEEE power India Conference, powerCON 2008

作者： Fei, Wang Zengqiang, Mi Qixun, Yang 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

ISBN: (纸本)9781424417629

The comparison between Hilbert space based power theory and three other power theories including traditional power theory , instantaneous power theory put forward by Akagi and Fryze power theory are analyzed in this paper. Theconsistency and difference are indicated in several different aspects: physical meaning, mathematical concept and the derivation of expressions. Analyses shows that traditional power theory can be regarded as a special case of Hilbert space based power theory, in other words, Hilbert space based power theory can be regarded as the generalization of traditional power theory. Fryze power theory is in accordance with Hilbert space based power theory in single-phase nonsinusoidal system, instantaneous power theory is in accordance with Hilbert space based power theory in three- phase symmetrical system without zero-sequence component. The definition of active current in Hilbert space based power theory is different from it in instantaneous power theory in three-phase system. © 2008 IEEE.

关键词： Hilbert spaces

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Closed loop test platform for SVC controller based on RTDS

Closed loop test platform for SVC controller based on RTDS

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11th International Conference on Electrical Machines and systems, ICEMS 2008

作者： Xiangning, Xiao Yang, Zhao Yan, Zhang Meng, Ye Xiaoning, Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing China Beijing Electric Power Corporation Beijing 100020 China

ISBN: (纸本)9787506292214

Real time test is a necessary step for the control device of equipment before it is installed in power system. In this paper, a closed-loop test platform which is based on Real Time Digital Simulator (RTDS) is established to test the performance of FACTS device controller. In this paper, Static Var Compensator (SVC) which is installed in a power plant is used for damping Sub Synchronous Oscillation (SSO) excited by fixed series compensator installed in the transmission line which is to improve the power transfer capability. The control approach, operation mode and the install location of SVC are studied in this paper and the real controller performance has been verified by the proposed test platform. Beside, this platform can also used for the test of performance of other FACTS devices controller.

关键词： Static Var compensators

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Improved differential evolution algorithm for economic dispatch of power systems

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2008年第10期28卷 100-105页

作者： Liu, Zi-Fa Zhang, Jian-Hua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

An improved differential evolution (IDE) algorithm was presented for power system load economic dispatch (ED), a classical nonconvex, nonlinear, combinational optimization problem. Despite for its simplicity and high-efficiency, differential evolution (DE) algorithm is prone to local optimal solution sometimes. Based on analysis of DE searching mechanism, IDE algorithm adopts adaptive control parameters according to swarms' distribution condition and the overlapping individuals undertake chaotic searching to improve its robust and global optima searching capability. The proposed IDE algorithm was tested on two systems consisting of 3, 40 and 69 thermal units whose incremental fuel cost function took into account the valve-point effects. The results indicate that IDE algorithm outperforms DE, GA, and PSO algorithms in solving load dispatch problems.

关键词： Electric power systems

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