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5th International Conference on Natural Computation, ICNC 2009

作者： Lin, Jikeng Wang, Xudong Key Laboratory of Power System Simulation Control of Ministry of Education Tianjin University Tianjin China School of Electric Power and Automation Tianjin University Tianjin China

ISBN: (纸本)9780769537368

The adaptive immune algorithm (AIA) developed from immune algorithm (IA), owns faster computation speed and better convergence than that of GA and other stochastic type algorithms, due to its characteristic of having two layers optimization. The paper proposes to apply adaptive immune algorithm for reactive power optimization. The coding method for the control variables based on decimal system is introduced in detail. The test results of example systems demonstrate its feasibility and validity. © 2009 IEEE.

关键词： Stochastic systems

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Dynamical simulation of laboratory Microgrid

Dynamical simulation of laboratory Microgrid

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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Zhao, Yishu Guo, Li Department of Electrical Engineering Shandong Electric Power Research Institute Jinan China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424424870

A MicroGrid can increase the reliability of energy supplies by disconnecting from the grid in the case of network faults or reduced power quality. The techniques that have been investigated to control MicroGrids in both modes are summarized as well as those proposed to maintain stability during the transitions from one mode to the other. This paper first introduces the MicroGrid planning structure in Shandong Electric power Research Institute (SEPRI) and discusses the various feasible control approaches used and presents for MicroGrid. Then, based on modeling different types of distributed generations and energy storage equipment, the SEPRI MicroGrid model was simulated with several operating modes under peer to peer control strategy. The importance of an energy storage to assist stability during transition between the operating modes is emphasized. © 2009 IEEE.

关键词： Energy storage

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Interface power control method based on power flow tracing and generator re-dispatch

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Dianli Xitong Zidonghua/Automation of Electric power systems 2009年第6期33卷 16-20页

作者： Zhao, Jinli Zhao, Jing Jia, Hongjie Yu, Xiaodan Key Laboratory of Power System Simulation and Control Tianjin University Tianjin 300072 China

An interface power control strategy based on power flow tracing and generator re-dispatch is presented. power flow on the interface is firstly traced backward to the sending-end system to locate the generators to be adjusted. Then the power flow is traced forward to determine the loads affected in the receiving-end system. power flow tracing is adopted again from such loads to determine their supplying generators in the receiving-end system, which is then used to compensate the load fluctuation according to the transmission change of the interface. Finally, New England 39-bus system and other systems are used to verify the effectiveness of the presented method. This work is supported by Special Fund of the National Basic Research Program of China (No.2004CB217904, 2009CB219701), National Natural Science Foundation of China (No.50707019, 50595413), Foundation for the Author of National Excellent Doctoral Dissertation of China (No.200439), Program for New Century Excellent Talents in University (***-05-0246), the key Project of Chinese Ministry of Education (No.105047), Fok Ying-Tung Education Foundation (No.104019) and Tianjin Municipal Science and Technology Development Program (No.06TXTJJC13700). © 2009 state Grid Electric power Research Institute Press.

关键词： power control

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The application of the data mining based on adaptive immune algorithm for power transformer fault diagnosis

The application of the data mining based on adaptive immune ...

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2009 International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC '09

作者： Jikeng, Lin Congmin, Wu Dongtao, Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China Tianjin Engineering Normal College Tianjin China

ISBN: (纸本)9781424452187

Adaptive Immune Algorithm based data mining (AIA-Data Mining) is presented for fault diagnosis of power transformer. The information entropy is used for the production of the initial population, which leads to convergence speed of the algorithm to be faster than that of the initial population produced by random. On the basis of that, the bi-level search Mechanism of the AIA further speeds up extraction of the decision-making table for the transformer fault diagnosis from the samples. Results from examples show that the method proposed is effective and feasible. © 2009 IEEE.

关键词： Data mining

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power load modeling based on wide-area measurements and support vector machine

Power load modeling based on wide-area measurements and supp...

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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Wang, Zhenshu Li, Linchuan Niu, Li Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China School of Electrical Engineering Shandong University Jinan China State Nuclear Electric Power Design and Research Institute Beijing China

ISBN: (纸本)9781424424870

At present, the load modeling is still one of the difficult problems in power system. In this paper, a new method is presented which uses wide-area measurements and support vector machine (SVM) for load modeling. Based on wide-area measurements, this method does non-linear regression analysis on model with SVM. By using radial basis function (RBF), model structure is optimized, and Bayesian Framework is used for identifying parameters, then a kind of non-mechanical model is founded. This method can easily solve the problems in choosing structure and identifying parameters. The founded model has good generalization ability, flexible structure, and rapid calculation speed. In the end, this method has been programmed;the simulation verifies the validity of this model. © 2009 IEEE.

关键词： Support vector machines

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ANN-based data mining for the detection of the most influential variables causing mismatch of super-heater outlet temperatures in a thermo-plant

ANN-based data mining for the detection of the most influent...

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2009 International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC '09

作者： Jikeng, Lin Xudong, Wang Tso, S.K. Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China City University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)9781424452187

ANN-based data-mining techniques are introduced to detect the most influential variables causing the mismatch of super-heater outlet steam temperatures. The strategies are: (1) Rough set selection: the rough variables set most likely to have possible effects on the mismatch of the outlet steam temperatures is deduced from about 3000 variables available in the power system data-base, by correlation analysis. (2) Relation capturing with ANN: the variables in the rough set are used as the input of an ANN, with the samples being appropriately chosen to train the ANN. (3) Sensitivity calculation of each ANN input for each training sample. (4) Influential variables set extraction: the criterion is to derive the sub-set characterized by the outstanding variables with the largest average of absolute sensitivity values. The influential variable set thus obtained, not intuitively known prior to the investigation, is found to be consistent with the general understanding of the power-plant engineers. © 2009 IEEE.

关键词： Sensitivity analysis

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Special problems in current differential protection based on Bergeron model

Special problems in current differential protection based on...

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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Bin, Li Wenhua, Chang Jiali, He Zhiqian, Bo Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China AREVA T and D Automation and Information Stafford United Kingdom

ISBN: (纸本)9781424424870

UHV long transmission line takes on distinct characteristics of distributed parameters, and it has great capacitive currents. Traditional phase segregated current differential protection is severely influenced by distributed capacitive current. In order to realize differential protection with high sensitivity and reliability for UHV transmission line, phase segregated current differential protection based on Bergeron model had been put forward. The time-domain Bergeron model is widely used for calculation during fault transient period. In theory, new principle can completely compensate capacitive current, but in practical application, consecutive sample values are necessary to realize calculation of Bergeron equation. Therefore, it's necessary to estimate the voltage or current values at non-sampling points. The paper proposes that the cubic spline interpolation algorithm can be used for calculation of Bergeron equation. Theoretical analysis and simulation tests show that the proposed method is valid and precise. © 2009 IEEE.

关键词： Electric lines

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Based on particle swarm optimization and simulated annealing combined algorithm for reactive power optimization

Based on particle swarm optimization and simulated annealing...

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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Wang, Zhenshu Li, Linchuan Li, Bo School of Electrical Engineering Shandong University Jinan China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China Shandong Electric Power Engineering Consulting Institute Jinan China

ISBN: (纸本)9781424424870

This paper presents a novel combined algorithm based on particle swarm optimization (PSO) and simulated annealing algorithm(SA) for power system reactive optimization. According to the characteristics of PSO and SA, the proposed method which combined PSO and SA efficiently makes good use of easily implementing performance and fast convergence performance of PSO and global convergence performance of SA, and makes them search in phase. This paper detailed explains coding of control variables, selecting of parameters and material steps of combined algorithm for optimizing reactive power. Taking the IEEE 14-bus system, IEEE 57-bus system and IEEE 118-bus system for example, the simulation results demonstrate that the proposed method is simple and easy to implement, and has high computing efficiency and comparing with conventional PSO it can obtain higher quality solutions. © 2009 IEEE.

关键词： Simulated annealing

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Corrigendum to “Using fuzzy theory and information entropy for water quality assessment in three Gorges region, China” [Expert systems with Applications 37 (3) (2010) 2517–2521]

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Expert systems with Applications 2010年第6期37卷 4720-4720页

作者： Li Liu Jianzhong Zhou Xueli An Yongchuan Zhang Li Yang Dispatch & Communication Center Hunan Electric Power Company Hunan Province Changsha 410007 China College of Hydroelectric and Digitalization Engineering Huazhong University of Science and Technology Hubei Province 430074 Wuhan China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University Beijing 100084 China

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Deterioration analysis of ex-serviced 110 kV XLPE cable based on residual charge method

Deterioration analysis of ex-serviced 110 kV XLPE cable base...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： B. X. Du Hongbo Li Yu Gao Li Wang Zhenxing Huo Key Laboratory of Power System Simulation and Control of Ministry of Education Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China Hebei Handan Power Supply Company Hebei China

In this paper, the deterioration investigation was carried on an ex-serviced 110 kV cross-linked polyethylene (XLPE) cable. XLPE sheets sliced from the cable insulation were taken as the test samples and the residual charge method was used as the diagnostic method. Two aluminum foils attached on the both sides of sample surface made the electrode constitution, between which the voltage was applied and the current was simultaneously measured. The residual charge was calculated to estimate the degree of the degradation. Additionally, Tan¿ test was carried out to assist the evaluation of cable degradation. Obtained results show that the degradation degree within the insulation varies with the changes of the position. The XLPE sheets near the outer semicon and the conductor aged more severely than that of the middle part. Meanwhile, the cable was anatomized and it was found that the water blocking layer had mildewed and the color of the outer part insulation turned into black.

关键词： Degradation Cable insulation Polyethylene Insulation testing Aluminum Electrodes Constitution Voltage Current measurement Conductors

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