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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Security Monitoring Control"

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Data mining used for the assessment of the ability of bidding units

Data mining used for the assessment of the ability of biddin...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Li, Ran Li, Jinghua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Provinece China

ISBN: (纸本)0780391144

A new data-mining method for assessment of the ability of bidding units is proposed in this paper. The algorithm of reducing attribute value is introduced to get minimum rules. An example which considers the various factors is illustrated the procedure of finding association among many factors and then obtained the rules to assess bidding units ability. The rules are very useful in supporting the generating bidding unit to make decisions and helping the electric agency (power eXchange -PX) and (Independent system Operator- ISO) to design an optimal trade plans. © 2005 IEEE.

关键词： Electric utilities

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New type of wide area fault location algorithm based on posterior viewpoints

New type of wide area fault location algorithm based on post...

引用

IASTED International Conference on power and Energy systems and Applications, PESA 2011

作者： Wang, Zengping Zhang, Yagang Zhang, Jinfang 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)9780889869059

The aim of relay protection is to isolate the fault zone or device and guarantee the system security. The primary protection and backup protection is in cooperation relationship, and backup one could not be canceled because of the DC power supply failure in substation. The fault location algorithm based on wide area information is one of the key points for novel wide area backup protection. By use of the synchronized phasor data uploaded by PMUs, the process of locating fault could be implemented in real-time or near real-time level. In this paper, based on Bayesian theory, we have studied the fault location in wide area backup protection systems. The simulation experiments have confirmed that the detection of fault can be resolved exactly and effectively by Bayesian theory.

关键词： Relay protection

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Research on flywheel energy storage system using in power network

Research on flywheel energy storage system using in power ne...

引用

Sixth International Conference on power Electronics and Drive systems, PEDS 2005

作者： Jianeheng, Zhang 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)0780392965

The flywheel energy storage (FES) system presented in this paper is composed of four parts;the flywheel, the bearing, the motor/generator and the power converter. The control methods and strategy of the FES system in power network are introduced in detail. During the storage period and generating timei, the waveform of the power converter output currents is controlled to be sinusoidal by using sinusoidal pulse width modulation (SPWM) control method, so the efficiency of the energy conversion is high and the torque ripple of the motor/generator is minimized. The control methods of starting and operating large moment of inertia of the flywheel are simulated and studied for the power converter. The latest experimental results of the FES system are Introduced, and the control validity is verified through these results. © 2005 IEEE.

关键词： Energy storage

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Study of electricity market stability model

Study of electricity market stability model

引用

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

作者： Lu, Zhanhui Li, Gengyin Zhou, Ming 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)0863412467

Combining electricity market dynamic model proposed by Alvarado, this paper uses differential/algebraic equations and eigenvalue techniques to study the stability of electricity markets. The necessary and sufficient conditions of judging electricity market stability and asymptotical stability are provided. As well as the sufficient conditions of judging electricity market unstable and asymptotical unstability is presented. The obtained conclusions removed the condition of Yang's with the assumption "the matrix is square and nonsingular" and other conditions. Using these stability conditions may directly judge the electricity market model stability by the initial data. In addition, the theoretical results in this paper can be used to reasonably explain the unable phenomena of electricity market proposed by Alvarado.

关键词： power markets

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Research and simulation of shunt reactors used to EHV transmission lines

Research and simulation of shunt reactors used to EHV transm...

引用

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

作者： Xu, Yuqin Zhang, Li Liu, Lihua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Qingnian road 204 Baoding China

ISBN: (纸本)0863412467

The power frequency over-voltage of EHV power transmission lines in three operating conditions, i.e., capacity effect of unloaded line, unsymmetrical faults and load shedding is analyzed. The shunt reactor's function to restrain the power frequency over-voltage is analyzed theoretically. Different compensation ratios and installment positions of shunt reactors are simulated in three operating conditions of 750 kV transmission lines through the software ATP/EMTP. From the simulation results, it is found that the shunt reactors can restrain the power frequency over-voltage in three operating condition effectively and the magnitude of the power frequency over-voltage will be lower with the compensation ratio of the shunt reactor becoming larger. In addition, when the shunt reactor is switched at the terminal of the transmission line, its effect restraining the power frequency voltage is the best compared with other two modes of connection in unloaded line with single power supply, unsymmetrical faults and load shedding. The method of operation for the shunt reactor is also discussed in this paper. Along with the expansion of the system capacity and the line's transmitted power, the method of operation that the shunt reactor is switched off from the system needs to be considered according to the power system's operation condition.

关键词： Electric lines

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Research on a practical approach of integrated compensation for unbalanced load

Research on a practical approach of integrated compensation ...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Cui, Zhengpai Yu, Han Li, Sheng Long, Yunbo Zhang, Jianhua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping District Beijing 102206 China

ISBN: (纸本)1424401364

Asymmetric load is quite common in distribution network, the compensation of which is a serious problem under some situations. A novel integrated compensation method is put forward based on the principle of reactive power compensation. A practical formula of the balancing compensation for the unbalanced load is deduced by using the symmetrical component method, which is not only suitable for the threephase three-wire system but also for the three-phase four-wire system. The simulation results based on MATLAB show the validity of the compensation for the unbalanced load with different connection, and verify the correctness of theoretical deduction. © 2006 IEEE.

关键词： MATLAB

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Coordinated control strategy for UPQC and its verification

Coordinated control strategy for UPQC and its verification

引用

2006 IEEE power Engineering Society General Meeting, PES

作者： Peng, Li Qian, Bai Gengyin, Li IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei China

ISBN: (纸本)1424404932

This paper researches profoundly on the coordinated control of UPQC (Unified power Quality Conditioner). By analyzing the radical reasons of coupling effect between UPQC series unit and shunt unit, a simple and practical coordinated control strategy for UPQC series unit and shunt unit is proposed, i.e. by introducing corresponding voltage corrective link directly to UPQC series unit and shunt unit respectively, and by suitable mode of PWM in addition, the coupling effect between its series unit and shunt unit is eliminated fully. Therefore, the complex degree of the whole UPQC control system is simplified greatly. Combined with a power quality waveform tracking method based on H∞ control, the coordinated control between UPQC series unit and shunt unit is implemented by the proposed strategy. The experimental results indicate that the method can eliminate the steady-state phase shift and amplitude attenuation of the voltage tracking compensation of series unit and the current tracking compensation of shunt unit for UPQC. Finally, the unified power quality multi-function control of UPQC is achieved. ©2006 IEEE.

关键词： power quality

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Application in electric power system transient stability analysis with PC cluster system

Application in electric power system transient stability ana...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Lu, Jinling Yu, Lei Zhu, Yongli 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)0780391144

In this paper, a simple parallel calculation cluster is built by PC and local area network. The power electric network is divided into several subnets according the method of path graph partitioning. Subnets are allocated to PC unit to calculate individual and the server is in charge of adjusting process and counting the current of link line. Besides soft-hard ware environment of PC cluster is given in this paper and the design and implementation of program are also presented. The key technique and way to settle problem are discussed during implementation procedure. At last, the IEEE39 nodal points system is tested. The satisfaction result is gotten by comparing to single computer. © 2005 IEEE.

关键词： Electric power transmission networks

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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 ...

引用

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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Research on the integrated criterion for single-phase reclosure of EHV transmission lines without shunt reactors

Research on the integrated criterion for single-phase reclos...

引用

2006 China International Conference on Electricity Distribution, CICED 2006

作者： Liu, Haofang Wang, Zengping Xu, Yan Ma, Jing 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)0863416381

The relation between the voltage at the end of the opened phase conductor (VATEOTOPC) and the sum voltage of the two healthy phases (SVOTTHP) are analyzed. An integrated criterion based on the relation is proposed to determine the fault nature of single-phase faults. The integrated criterion is simple in scheme and can be realized easily. It can distinguish between temporary and permanent faults effectively and has good adaptability to load currents and fault distances. Simulation tests show that the conclusions in this paper are correct.

关键词： Permanent fault Temporary fault The sum voltage of the two healthy phases(SVOTTHP) The voltage at the end of the opened phase conductor(VATEOTOPC)

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