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Power system Transient Stability Simulation Using the Precise Time-Integration Method

Power System Transient Stability Simulation Using the Precis...

引用

International Conference on Power system Technology (POWERCON)

作者： Xianrong Chang Yubin Wang Lifeng Hu School of Electrical Engineering North China Electric Power University Baoding Hebei China Power Supply Bureau of Shijiazhong Hebei China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education(North China Electric Power University) and School of Electrical Engineering North China Electric Power University Baoding 071003 Hebei Province P. R. China. e-mail: HLF873@***

Based on the precise time-integration method and the models of power system, a fast and simple simulation method for power system transient stability is discussed in this paper. This method has its advantages such as the numerical stability and programming simplicity. The techniques of factorization and sparse matrix are used in this method. The computer simulations on a real-life system prove the effectiveness of this method.

关键词： Power system transients Power system stability Power system simulation Power system modeling Power system reliability Numerical stability Power system protection Power system dynamics Power system security Power system analysis computing

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Decomposition on pollution current of load emitting and analysis of its influence on power price

Decomposition on pollution current of load emitting and anal...

引用

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

作者： Jia, Xiufang Zhao, Chengyong Suo, Juan Li, Gengyin IEEE 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 NCEPU School of Electrical Engineering NCEPU

ISBN: (纸本)0780391144

Along with the increment of disturbing loads in the power system, the effect on network that is brought by the power quality problems, become increasingly serious. Based on the market bargaining principles, the power price should be affected by the disturbance of loads. However current power price system fails to reflect the factor. Evaluation of load's disturbing property and analysis of its influence to power price is performed in this paper. The load current can be decomposed into three parts: instantaneous active current, instantaneous fundamental reactive current and instantaneous distorted current by the generalized instantaneous reactive power theory in dq0 coordinate system. The reactive current emission factor reflecting pure resistance of load and distorted current emission factor reflecting load's linearity are defined. According to these two factors, the evaluation method of the effect of the disturbing load on the power price based on allocating compensation equipment's cost is presented. The method provides some basis for contract's subscribing in the future. The calculated example shows the feasibility of above method, as well the degree of the influence of the disturbing load upon the power price. © 2005 IEEE.

关键词： Electric loads

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Integrating radial basis function neural network with fuzzy control for load forecasting in power system

Integrating radial basis function neural network with fuzzy ...

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

作者： Sheng, Siqing Wang, Cong 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 School of Electrical Engineering North China Electrical Power University Baoding Hebei 071003 China

ISBN: (纸本)0780391144

Short-term load forecasting of power system is not only the basis of scheduling of generating sets, but also the basis of working out the transaction schedule in electricity market. This paper proposes a short-term load forecasting method based on combination of Radial Basis Function (RBF) neural network and fuzzy control, uses on-line self-modify factor fuzzy control to eliminate forecast error on the basis of RBF neural network forecasting. The practical examples show that the accuracy of short-term load forecasting and training speed can be improved and gains the very satisfactory results by the proposed method. © 2005 IEEE.

关键词： Electric load forecasting

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Risk management on long-term electricity purchase allocation in China power markets

Risk management on long-term electricity purchase allocation...

引用

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

作者： Zhou, Ming Li, Gengyin Nie, Yanli Ni, Yixin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0780392965

This paper presents an integrated framework for the optimal management of electricity purchase allocation and risk for load service entities (LSEs). To the practice of China Power Markets, we propose the framework of power portfolio of combined physical forward contract and spot market. The framework suggests that the forward contracts should have different prices on-peak and off-peak in accord with sale prices distinguish on-peak and off-peak. The optimal purchase problem is described by the utility maximum integrated the rate of return and risk tolerance level, and risk is evaluated by Value at Risk (VaR). The analytical solution is also conducted. The numerical results are reasonable with higher rate of return and better risk hedging compared with the corresponding results from the existing portfolio selection approach. The presented framework gives one possible and effective method for the optimal power portfolio and risk management in incomplete power markets. © 2005 IEEE.

关键词： Risk management

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Power quality disturbance detection based on mathematical morphology and fractal technique

Power quality disturbance detection based on mathematical mo...

引用

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

作者： Li, Gengyin Zhou, Ming Luo, Yan Ni, Yixin IEEE 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 Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0780391144

Based on mathematical morphology and grille fractal, a novel approach on power quality disturbance detection and location is presented in this paper. At first a parallel composite morphological filter with multiple-structure elements is designed to filter the random noise and impulse noise in power quality disturbance signals. Then to the filtered curves, an easy implementation criterion for singularity detection based on the change regularity of grille fractal is proposed to locate the start and end time that disturbance occurs. The voltage sag, swell, harmonic and their combined disturbances are used to verify the validity of the proposed filter-location approach. Numerical results show that the proposed approach is valid and effective. © 2005 IEEE.

关键词： Electric power distribution

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Condition-based maintenance of electrical equipments based on ID3 algorithm and Monte Carlo stimulation

Condition-based maintenance of electrical equipments based o...

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

作者： Li, Ran Chen, Li Gu, Xueping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric PowerPower University Baoding 071003 Hebei Province China Department of Electrical Engineering North China Electric Power University North China Electric Power University

ISBN: (纸本)0780391144

Condition-Based Maintenance is an advanced maintenance strategy which is based on the monitoring of equipments status and according to the results of monitoring and analysis people can arrange maintenance scientifically. When monitoring and analyzing the status of equipments, there are vast historical and on-line data to analyze. If we can find the main factors leading to equipment failure through analyzing the data and pay more attention to these factors, we can make maintenance decision more exactly and quickly. In this paper we propose to apply ID3 Algorithm to classify the data according to the importance of their influence to equipment failure and then find the factors which influence equipments most. After finding the most important factors, apply Monte Carlo Simulation to forecast the probability of equipment failure which occurs in their operational life span, and according to this we can pay more attention to monitor the factors which result in failure easily. © 2005 IEEE.

关键词： Electric equipment

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The research of electric appliance running status detecting based on DSP

The research of electric appliance running status detecting ...

引用

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

作者： Li, Baoshu Quan, Chao Zhao, Shutao Tong, Weiguo Tao, Peng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003Hebei Province China Electrical Engineering Department North China Electric Power University Baoding 071003 China North China Electric Power University Baoding 071003 China

ISBN: (纸本)0780391144

A new load detection method was presented based on its running status of Power system. The loads are sorted according to their index of capacitive, inductive, and none-linear. The static character of each load was got according to the time-distribution. The concept of load detection is completed. The data-sample and wave recording equipment is designed and assembled based on the DSP for power loads status detecting. The superior software was designed for data management and analyzing. The recognizing status data was analyzed in both time-domain and frequency-domain;the identifying method for electric power loads status is deduced based on the correlation coefficient;the mathematical model for the status identifying is built;the trueness and validity of the methods is verified based on the testing and analyzing. © 2005 IEEE.

关键词： Electric power systems

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On site PD detection on XLPE cable accessories

On site PD detection on XLPE cable accessories

引用

Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference

作者： Wei Wang Changyu Li Chengrong Li Bin Zheng Luhua Zhang Beijing Key Laboratory of High Voltage & EMC Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education School of Electrical Engineering North China Electric Power University Beijing China

On-site partial discharge detection on XLPE cables accessories is very difficult because of pulse noise interference, such as pulse interference created by automobile ignition coils on the street, etc. A suitable solution for the monitoring of cable accessories during operation is a sensitive on-site PD detection method. This can be realized in an advantageous way with combinatorial sensors, an antenna sensor, a UHF sensor, and two VHF split-core PD sensors. These sensors are not connected to the high voltage directly, a UHF sensor can be placed near the cable joint and two split-core sensors can be installed on both sides of the cable joint easily and safely. The detection making several windows in the time domain towards multiple wide-band pulse signals can achieve reliable discrimination of real internal PD and external noise under noisy on site conditions. More than twenty cases of on-site PD detection for HV XLPE cables have been proven this way. This method has high detection sensitivity and high noise recognition ability

关键词： Partial discharges Cables Interference Automobiles Ignition Coils Monitoring UHF antennas Voltage Wideband

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Power Quality Disturbance Detection Based on Mathematical Morphology and Fractal Technique

Power Quality Disturbance Detection Based on Mathematical Mo...

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

作者： Gengyin Li Ming Zhou Yan Luo Yixin Ni Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

关键词： Power quality Morphology Fractals Power harmonic filters Signal sampling Signal analysis Shape educational programs Noise shaping Voltage fluctuations

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Information Retrieval Technology 1

引用

丛书名： Lecture Notes in Computer Science

1000年

作者： Sung Hyon Myaeng Ming Zhou Kam-Fai Wong Hong-Jiang Zhang

ISBN: (数字)9783540318712

ISBN: (纸本)9783540250654

TheAsiaInformationRetrievalSymposium(AIRS)wasestablishedbytheAsian information retrieval community after the successful series of Information - trieval with Asian Languages (IRAL) workshops held in six di?erent locations in Asia, starting from 1996. While the IRAL workshops had their focus on inf- mation retrieval problems involving Asian languages, AIRS covers a wider scope of applications, systems, technologies and theory aspects of information retrieval in text, audio, image, video and multimedia data. This extension of the scope re?ects and fosters increasing research activities in information retrieval in this region and the growing need for collaborations across subdisciplines. We are very pleased to report that we saw a sharp increase in the number of submissions and their quality, compared to the IRAL workshops. We received 106papersfromninecountriesinAsiaandNorthAmerica,fromwhich28papers (26%) were presented in oral sessions and 38 papers in poster sessions (36%). It was a great challenge for the Program Committee to select the best among the excellent papers. The low acceptance rates witness the success of this year’s conference. After a long discussion between the AIRS 2004 Steering Committee and Springer, the publisher agreed to publish our proceedings in the Lecture Notes in Computer Science (LNCS) series, which is SCI-indexed. We feel that this strongly attests to the excellent quality of the papers.

关键词： Information Storage and Retrieval Information systems Applications (incl. Internet) Algorithm Analysis and Problem complexity Data Structures Data Storage Representation Discrete Mathematics in Computer Science

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