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

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A Mathematic Model and its Iterative Algorithm on Obtaining Optimal Capacity of P-S Station

A Mathematic Model and its Iterative Algorithm on Obtaining ...

引用

2007 International power Engineering Conference (IPEC2007), vol.1

作者： Fang Cao Li-zi Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

With rising electricity loading in developing country, measuring capacity of pumped-storage station (P-S station) is becoming more critical. This paper tries to establish mathematic model on obtaining capacity of P-S station for maximum cost sayings. The paper first deducts the relationship between capacity of P-S station, peak load and the vale load by simulating cost curve of thermoelectric unit, and then deducts the formula for calculating optimal capacity of P-S station. Based upon these findings and the load curve, the paper then develops the curve to describe the relationship between volume of generated electricity and capacity of the P-S station and provides the solution for obtaining optimal capacity of the P-S station. Finally, the paper discusses the impact of selecting initial solution or certain iterative solution on iterative speed and suggests the direction for further research.

关键词： Iterative methods Optimization methods Pumped storage power generation

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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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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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IEEE Women in Engineering Magazine 2007年第1期1卷 16-17页

作者： Leslie Prives Key Laboratoty of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei Province China

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Fault Component Impedance Relay with Double Circular Characteristic

Fault Component Impedance Relay with Double Circular Charact...

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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

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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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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...

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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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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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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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