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

共 542 条记录，以下是351-360 订阅

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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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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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Economic Assessment of Voltage Sags Based on Quality Engineering Theory

Economic Assessment of Voltage Sags Based on Quality Enginee...

引用

power Tech Conference

作者： Gengyin Li Ming Zhou Biao Zhang Jin Yang Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China School of Electrical and Electronic Engineering China Electric Power University Baoding Hebei China

Voltage sag, one of the modern power quality problems, may cause tremendous economic loss, which needs scientific method to evaluate. This paper proposes an approach using quality loss function and signal-to-noise ratio (SNR) in quality engineering theory to make economic assessment to voltage sag. The inverted normal probability loss function is used to describe losses of single-type sags, where SNR method is applied to integrate different types together. The index of sag-caused loss is proposed, which is an important parameter for PQ evaluation. A five-node 35 kV distribution system is used to verify the proposed approach. The result shows that the proposed method could effectively assess financial losses caused by sags and be a reasonable instruction for PQ evaluation, improvement and pricing.

关键词： power quality Voltage fluctuations power generation economics power engineering and energy IEEE members power markets Pricing Signal to noise ratio power system economics Electric variables measurement

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WAMS Implementation in China and the Challenges for Bulk power system protection

WAMS Implementation in China and the Challenges for Bulk Pow...

引用

IEEE General Meeting power& Energy Society

作者： Qixun Yang Tianshu Bi Jingtao Wu Beijing Sifang Automation Company Limited North China Electric Power University China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under MOE North China Electric Power University Beijing China Beijing Sifang Automation Company Limited Beijing China

Synchronized phasor measurement technology has been gaining increasingly interests in China due to its wide area time synchronization capability and fast transmission speed. Over 10 years of implementation of wide area measurement system (WAMS) in Chinese power grid have shown its great value in power system dynamic monitoring and potential applications in system modeling and validation, feedback control and system wide protection. This paper reviews the overall implementation of WAMS in China and analyzes the corresponding characteristics of WAMS. Moreover the challenges for bulk power system protection with synchronized phasor measurement technology are presented also.

关键词： power system protection Wide area measurements Area measurement Gain measurement Velocity measurement Time measurement power grids power system dynamics monitoring Modeling

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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

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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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Research on the Model and control Strategy of One Multi-Module-Converter Based VSC-HVDC

Research on the Model and Control Strategy of One Multi-Modu...

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2007 IEEE International Symposium on Industrial Electronics (ISIE 2007), vol.2

作者： Guoliang Zhou Xinchun Shi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

This paper presents a model and control strategy for one multi-module-converter based VSC-HVDC system. Each converter operates with a fairly low switching frequency, and thus it is applicable to select high-power low-switching-frequency and low-conduction-loss electronic devices such as IGCT or GTO in high-power applications. A mathematical model is developed for the overall multi-module-converter based VSC-HVDC system. A controller is also designed systematically for the HVDC system based on the developed system model. Performance of the overall HVDC system and effectiveness of the designed controller are evaluated based on digital time-domain simulations in the MATLAB software environment.

关键词： power conversion Switching frequency Mathematical model Switching converters HVDC transmission Topology Voltage Sampling methods power system modeling Reactive power control

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The Effect of DVR on Distribution system with Distributed Generation

The Effect of DVR on Distribution System with Distributed Ge...

引用

International Conference on Electrical Machines and systems 2007(ICEMS2007)(第十届国际电机与系统会议)

作者： Xuanxuan Liu Peng Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Recent years, some DG (distributed generation) have been introduced in distribution systems, and the voltage violation problem has been at stake for the distribution system. The impact of DG integration on distribution system is studied in this paper, and the transient stability mechanism of DG is analyzed theoretically. This paper investigates the dynamic analysis of a DVR when applied to correct the voltage distortion in distribution system. Then the model of DG is built by Matlab/Simulink. And it is used to study the impact of DG integration on the distribution system. Then the voltage regulation-dynamic voltage restorer (DVR) is introduced to distribution network with distributed generation. A calculation method for DVR in distribution system with distributed generation is proposed, which is based on a semi-period algorithm to extract fundamental component from fault signal then extract the fundamental positive sequence voltage by the decomposition instantaneous link, and then the quantity of voltage compensation can be solved by direct detection algorithm. Simulation results show that the introduction of DVR (dynamic voltage restorer) to the distribution system with distributed generation is good for voltage regulation and making a good guarantee of the voltage quality of sensitive loads; and the algorithm for DVR is simple and effective.

关键词： Distributed control Voltage control power system stability power quality control systems Signal restoration Detection algorithms Photovoltaic systems Wind turbines power systems

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Research on Identifiability of Equivalent Motor in Composite Load Model

Research on Identifiability of Equivalent Motor in Composite...

引用

power Tech Conference

作者： Ma Jin Han Dong He Renmu Dong Zhaoyang David J. Hill Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China School of Information Technology and the Electrical Engineering University of Queensland Saint Lucia QLD Australia Department of Information Engineering Australian National University Australia

Load modeling is very important for power system dynamic analysis and control. The composite load model widely applied recently in the power system operation centre consists of the static load and the equivalent motor. Current practices in measurement-based load modeling identify all the parameters in this composite load model. However, it is not clear whether all these parameters could be identified from the measurements. This paper investigates the identifiability of the equivalent motor parameters in the composite load model. Trajectory sensitivity approach is applied first to find the motor parameters that have great effects on the measured active as well as reactive load dynamics. The analysis results show that the motor outputs have various sensitivities with respect to the parameters. Since the voltage disturbance, the active load and the reactive load dynamics are applied to identify the motor parameters, those parameters affecting the measurements to a great extent are observable, thus identifiable from the measurements; while those that have little effects on the motor outputs are unobservable from the measurements and consequently unidentifiable. The case studies verify the identifiability of the motor parameters.

关键词： Load modeling power system modeling power system dynamics power system simulation power system stability power system analysis computing power system measurements Voltage power system control power systems

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