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

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Hybrid Non-linear State Estimation with Voltage Phasor Measurements

Hybrid Non-linear State Estimation with Voltage Phasor Measu...

引用

IEEE General Meeting power& Energy society

作者： Xiaohui Qin Tianshu Bi Qixun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

In this paper, a new method of hybrid non-linear state estimation with PMU is proposed. Firstly, the voltage phasor measurements are transformed into indirect equivalent branch current measurements, with which the conventional state estimator takes the impact of PMU into consideration. Secondly, the indirect measurement errors caused by the measurement transforming are analyzed and calculated in detail. Thirdly, the accuracy of hybrid estimator is analyzed in the paper. The simulation results show that the proposed method improves the accuracy of estimator and the convergence speed also.

关键词： State estimation Voltage measurement Phasor measurement units Current measurement Fluid flow measurement Jacobian matrices power measurement Bismuth power system simulation Hybrid power systems

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Phase-to-Phase Distance Relay Based on the Measured Impedance Trajectory

Phase-to-Phase Distance Relay Based on the Measured Impedanc...

引用

IEEE General Meeting power& Energy society

作者： Huanzhang Liu Qiankuan Liu Shaofeng Huang Qixun Yang Huazhong Electric Power Dispatch and Communication Center Wuhan China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

The measured impedance trajectory changing with fault resistance during multi-phase faults and the reasons that fault resistance may cause unwanted impedance relay operations in two-source systems were analyzed in this paper. To improve the impedance relay adaptive ability and reliability during three phase fault, a combined phase-to-phase impedance relay based on the measured impedance trajectory was presented. The relay is composed of three criteria respectively called the reactance line based on the measured impedance trajectory, the sending end and the receiving end directional lines, whose transient and steady state operating characteristics have been analyzed for forward and reverse faults. The simulation test was made by RTDS on a 340 km long 750 kV line in a two-source system. Theoretical analysis and dynamic simulation test results show that the adaptive relay can respond to three phase faults and phase-to-phase faults, and has satisfactory performances.

关键词： Protective relaying Impedance measurement Phase measurement Relays Electrical resistance measurement Transient analysis Steady-state system testing Performance analysis Analytical models

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Research on energy efficiency of supercapacitor energy storage system

Research on energy efficiency of supercapacitor energy stora...

引用

2006 International Conference on power system Technology, powerCON2006

作者： Yun, Zhong Jiancheng, Zhang Gengyin, Li Aiguo, Liu Department of Electrical Power Engineering North China Electric Power University Baoding. Hebei 071003 China School of Information Engineering Nanchang University Nanchang Jiangxi 330029 China 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)1424401119

Recent developments in the field of supercapacitors have led to the achievement of high specific energy and high specific power devices which are suitable for energy storage in high power electronic applications, especially in the field of management of embarked electrical power. Equivalent serial resistance is put forward to estimate energy efficiency. Reducing the equivalent series resistance in a supercapacitor will gain a great appreciation. A supercapacitor energy storage system (SCESS) is also designed in this paper which is mainly composed of three parts: the electrical double-layer capacitors array that stores energy, the AC/DC-DC/AC power converter system and the integrated control system composed of microprocessors. This SCESS installed capacity is 0.235MJ;peak power is 5OkW;and generating efficiency is up to 97.94%. © 2006 IEEE.

关键词： Energy efficiency

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The propagation characteristics of electromagnetic wave generated from partial discharges in power transformer by FDTD simulation

The propagation characteristics of electromagnetic wave gene...

引用

2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP

作者： Tang, Zhiguo Li, Chengrong Wang, Wei Wang, Hui Wang, Li Ding, Yansheng Beijing Key Laboratory of High Voltage and EMC Ministry of Education North China Electric Power University Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University State Grid Corporation of China 100081 Beijing China Beijing Key Laboratory of High Voltage and EMC School of Electric and Electronic Engineering North China Electric Power University P.O. No.88 Beijing 102206 China

The radiation and propagation of electromagnetic (EM) waves generated from PD caused by the obstruction of main transformer components are studied by FDTD simulation in order to get more information for PD location and diagnosis. Current filament, perfect conductive cylinder and perfect conductive spiral coil models are used to simulate the radiation and the influences of iron-core and transformer coil to the propagation of EM *** results demonstrate dynamic propagation process of EM waves in time order, and prove the correctness of the shortest optical path principle. But the attenuation and distortion of EM waves-especially the first peak amplitude-caused by the obstruction of large solid conductive obstacle like iron-core are quite intensive that it may cause great difficulties to identify exact arriving time position of incident waves coming along the shortest optical path. While the influences of the coil to the propagation of EM waves are so little that HF EM waves can penetrate it in almost linear path. ©2007 IEEE.

关键词： Electromagnetic waves

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Measurement-based load modeling using genetic algorithms

Measurement-based load modeling using genetic algorithms

引用

2007 IEEE Congress on Evolutionary Computation, CEC 2007

作者： Ma, Jin Dong, Zhao-Yang He, Ren-Mu Hill, David J. IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education 102206 Beijing China School of Information Technology and Electrical Engineering University of Queensland St. Lucia QLD 4072 Australia Department of Information Engineering Australian National University Australia

ISBN: (纸本)1424413400

Load modeling is very important to power system operation and control. Measurement-based load modeling has been widely practiced in recent years. Mathematically, measurement-based load modeling problem are closely related to the parameter identification area. Consequently, an efficient optimization method is needed to derive the load model parameters based on the feedback of estimation errors between the measurements and model outputs. This paper reports our work on applying genetic algorithms on measurement-based load modeling research. Due to its robustness to the initial guesses on the load model parameters, genetic algorithms are very suitable for load model parameter identification. Two cases including both the real measurement in a power station and the digital simulation are studied in the paper. For comparison purpose, the classical nonlinear least square estimation method is also applied to find the load model parameters. The simulated outputs from the load model confirm the efficiency of genetic algorithms in measurement-based load modeling analysis. Future work will focus on fastening the converging speed of the genetic algorithms, and/or utilizing more efficient evolutionary computation methods. © 2007 IEEE.

关键词： Electric load management

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Fault Component Impedance Relay with Double Circular Characteristic

Fault Component Impedance Relay with Double Circular Charact...

引用

IEEE General Meeting power& Energy society

作者： Shaofeng Huang Qiankuan Liu Huanzhang Liu Qixun Yang Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Although the fault component impedance relay has many perfect performances, it is still restricted by high fault resistance. In order to improve its resistive tolerance and overcome unreliable operation, a new type relay with double circular characteristic is put forward, as well as its operating boundary and general operating equation are researched in this paper. The relay is comprised of two groups operation equations, one of them is calculated by sampling integral arithmetic to achieve its ultra-high speed while the other by Fourier arithmetic to enhance the relay capability against high resistance. dynamic simulation test has been made with a typical two sources system operating at 750 kV to verify the relay performance. Theoretical analyses and test results show that the fault component impedance relay with double circular characteristic is simple, reliable and secure with ultra-high speed and great capability against fault resistance.

关键词： Impedance Relays Protective relaying power system relaying Arithmetic power system reliability power system stability power system protection power system faults Integral equations

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Study of UHV DC corona performance in a mini corona cage

Study of UHV DC corona performance in a mini corona cage

引用

Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference

作者： Wei Wang Chengrong Li Jianbin Fan Chen Gu Yitao Jiang Guohua Cui Beijing Key Laboratory ofHigh Voltage & EMC Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China China EPRI Beijing China

To research the effect of high altitude on corona performance of UHV DC transmission line, the corona inception voltage gradient of a copper line at different air pressure level from 101 kPa to 61 kPa was measured in a mini corona cage. The results have been compared with calculated results of Peek law and the corona inception voltage gradient correction factor of air pressure was presented.

关键词： Corona Voltage Humidity system testing Laboratories Copper Pressure measurement Oscilloscopes power transmission lines Acoustic measurements

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Combined Use of Fuzzy Set-Covering Theory and Mode Identification Technique for Fault Diagnosis in power systems

Combined Use of Fuzzy Set-Covering Theory and Mode Identific...

引用

2007 IEEE power Engineering society General Meeting (PES 2007), vol.6

作者： Jian Xiao Fushuan Wen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of Education Beijing China Department of Electrical Engineering South China University of Technology Guangzhou China

After a fault occurs in a power system, generally some operating information of protective relays and circuit breakers could be obtained. Because protective relays and circuit breakers might improperly operate or fail to operate, and some errors and distortion may exist in data acquisition and communication, as a result uncertainties could be involved in the received information. A fault diagnosis model based on fuzzy set-covering theory and mode identification technique is proposed in this paper. With the fuzzy technology, the above mentioned uncertainties could be dealt with very well. Meanwhile, as the protective relays and circuit breakers may fail to operate in some cases, there are several different operating modes in protective relays and circuit breakers even for a same electrical device failure. Based on the received information, the proposed model could identify the most possible operating mode, and then the information corresponding to a fault hypothesis could be obtained. In the proposed model, the proposed fault diagnosis problem is described as a 0-1 integer programming one, and thus could be solved by the widely employed search technology, i.e., the well-known Tabu search method. The feasibility and efficiency of the proposed model is demonstrated by a sample power system.

关键词： Fault Diagnosis Fuzzy Sets Set-Covering Theory Mode Identification Technique

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An Integrated Approach on Allocating the Fixed Wheeling Cost of Large Consumers Considering Time-of-Use Pricing and power Quality

An Integrated Approach on Allocating the Fixed Wheeling Cost...

引用

power Tech Conference

作者： Ming Zhou Gengyin Li Yanan Zheng Jin Yang Jianxun Qi School of Business Management North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

With start of trial operation of direct purchasing electricity for large consumers in China, the method on how to allocate wheeling costs among large consumers is of vital theoretical and practical significance. An integrated method for allocating fixed wheeling cost among larger consumers is presented taking time-of-use (TOU) feature, power quality demand and electricity quantity of direct purchase into account. TOU index modeling and power quality index modeling is proposed. The weights of three indices are determined by interacting between the transmission service provider (TSP) and large consumers based on multilevel models to get comprehensive evaluation indices for all consumers. The postage stamp method is modified to allocate the cost using the integrated indices instead of electric energy. Numerical example shows that the proposed approach can allocate fixed cost more reasonable and fair.

关键词： Costs Pricing power quality Energy consumption power generation Load flow IEEE members power industry Energy management power system management

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power system Restoration in Restructured power Industry

Power System Restoration in Restructured Power Industry

引用

2007 IEEE power Engineering society General Meeting (PES 2007), vol.6

作者： Zhenzhi Lin Fushuan Wen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electrical Engineering South China University of Technology Guangzhou China

power system restoration decision-making is one of the most important and indispensable issues for ensuring fast power supply restoration to end users. In recent years, the power industry around the globe has been undertaking an in-depth restructuring, and this has led to some new challenges to the problem of power system restoration. In this paper, several important issues related to power system restoration in the traditional power industry and in the electricity market environment are analyzed and compared, and then the impacts of the restructuring efforts on the power system restoration are identified and clarified from several aspects including black-start, restoration tests, dispatching and distribution system service restoration. Up to now, in most of the practically operating electricity markets around the globe power system restoration ancillary service is still based on cost compensation rather than market mechanism.

关键词： Electricity market power system restoration Black-start Distribution system service restoration

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