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Simulation of PD Location in power Transformer Based on Root Multiple Signal Classification Method

Simulation of PD Location in Power Transformer Based on Root...

第九届电介质材料性能与应用国际会议(The 9th International Conference on Properties and Applications of Dielectric Materials)

作者： Yan-qing LI Qing XIE Nan WANG Xin XIANG Fang-cheng L(U) Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control(North China Electric Power University) Ministry of Education Baoding 071003

ISBN: (纸本)9781424443673

Due to the heavy calculation and low estimation precision with little signal-to-noise (SNR) of MUSIC (Multiple Signal Classification) algorithm in partial discharge location used ultrasonic phased array, in this paper, a new location method is proposed based on Root-Multiple Signal Classification(Root-MUSIC). Firstly, Root-MUSIC algorithm is used for direction of arrival estimating of PD source. Secondly, space location of PD source is realized by crossover location principle. Finally, the result of simulation based on 7×7 plane phased array model vertifies the correctness of the new method.

关键词： partial discharge root-MUSIC crossover location

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Wave-front arrival time analysis using wide-area frequency measurements

Wave-front arrival time analysis using wide-area frequency m...

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IEEE General Meeting power& Energy Society

作者： Jing Ma Jinlong Li Zengping Wang Jie Wu Tao Xia Lang Chen Yilu Liu School of Electrical and Electronic Engineering North China Electric Power University Beijing China Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute Blacksburg VA USA Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Zhejiang Electric Power Design Institute Hangzhou China

Due to the influence of the local noise at the distribution level, the frequency curve obtained from the frequency disturbance recorder (FDR) unit is too non-stationary to observe its wave-front directly, which causes some problems in the event location estimation method. In this paper, a morphological filter (MF) is employed to extract the wave-front arrival time and the trend of the frequency curve. With the help of the MF, the accuracy of the event location method is greatly improved.

关键词： Frequency measurement Frequency estimation power system measurements Network servers Wide area measurements Filters Web server Global Positioning system Frequency synchronization power system dynamics

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Wide area measurements-based model validation and its application

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IET Generation, Transmission and Distribution 2008年第6期2卷 906-916页

作者： Ma, J. Han, D. Sheng, W.-J. He, R.-M. Yue, C.-Y. Zhang, J. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China Limited CNCRC Universal Plaza Chaoyang District Beijing 100016 China

Simulation veracity is very important to the plan and operation of a power system. Too optimistic a simulation will put the system at risk whereas too pessimistic a simulation will waste investments. Wide area measurements (WAMs), one of the fast developing technologies in recent years, could record the synchronized phasors in the whole power grid, which provides the possibility for simulation validation work. Recent contingency reproduction work worldwide has shown the inaccuracy of current digital simulation. Therefore simulation validation and model calibration are necessary to enhance simulation veracity. However, because of the complexity of the power system, it is difficult to find the erroneous ones among a large amount of components, which makes the simulation validation a very challenging problem. A new approach for WAMs-based simulation validation work is proposed. The proposed method is very simple and easy to be implemented in the available power system simulation software. Then, the trajectory sensitivity method is applied to the parameter calibration work. Real applications via the proposed methods in the big NE power grid of China are studied, which fully show the efficiency of the proposed methods. © 2008 The Institution of Engineering and Technology.

关键词： Computer software

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Recent progress and future perspective on condition monitoring and diagnostic techniques for power equipments in China

Recent progress and future perspective on condition monitori...

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2008 International Conference on Condition monitoring and Diagnosis, CMD 2008

作者： Li, Chengrong Tang, Zhiguo Zheng, Zhong Beijing Key Laboratory of High Voltage Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424416219

Under the general backgrounds of fast development of economy, China' power industry is undergoing a new upsurge of infrastructure construction. With the urgent need of the whole society for reliable power supply, Condition Based Maintenance strategy is becoming the mainstream of the operation and management of the power system. In this paper, recent progress of Condition monitoring and Diagnostic technologies for major power apparatus are reviewed. Also, some statistical data on practical on-line monitoring applications in China are introduced. At last, the key problems and trends of CMD are discussed with a viewpoint future perspective. ©2007 IEEE.

关键词： Condition based maintenance

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Validation of measurement-based load modeling for large-scale power grid

Validation of measurement-based load modeling for large-scal...

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IEEE power and Energy Society 2008 General Meeting: Conversion and Delivery of Electrical Energy in the 21st Century, PES

作者： Yanhui, Xu Renmu, He Dong, Han Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China

ISBN: (纸本)9781424419067

For a large-scale power grid, how to obtain load model for the substation without load characteristics recorder is the problem facing measurement-based load modeling. The feasibility that the measurement-based load model of a substation is applied to every substation was studied in this paper. The simulation results indicate that it is not feasible. Consequently, two methods were adopted to solve the problem. One method is that all substations were classified into several groups and then the measurement-based load model of a substation in every group was applied to the substations of its group. The other method is to get the base vectors of load model parameters and then obtain the load model parameters of all substations based on aggregation theory. The above two methods are validated in the practice of Northeast China power Grid load modeling. This has important significance for generalizing measurement-based load modeling to large-scale power grid. © 2008 IEEE.

关键词： Electric power transmission networks

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Eigenvector selection in load classification and model generalization

Eigenvector selection in load classification and model gener...

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3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Zheng, Xiao-Yu Jin, Ma. He, Ren-Mu IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China

ISBN: (纸本)9787900714138

It has been well recognized that the load model has great effects on the power system analysis and control. However, it is also widely known that the load modeling is a quite difficult problem due to its special properties such as time-variant characteristics of the load. In this paper, the measurement-based load modeling approach and multi-curve identification technique are applied in Hushitai power station in Northeast China. In order to build practical load models that can describe the actual load characteristics without changing the model parameters too often, cluster analysis is used to classify the loads. Two main kinds of eigenvectors used in cluster analysis are also compared. Finally, based on the load classification, a new aggregation method is proposed to build load models with good generalization capability. Case studies show the efficiency of the proposed method. © 2008 DRPT.

关键词： Cluster analysis

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Study on improvement of available transfer capability by demand side management

Study on improvement of available transfer capability by dem...

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3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Ming, Zhou Yajing, Gao Gengyin, Li IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9787900714138

Demmand Side Management (DSM) is now an important consideration for electric power utilities. DSM in general refers to any activity adopted by an electric utility that ultimately changes the utility's system load curve. Enhancing the DSM activities could help not only the system operate more efficiently, but also benefit the system Available Transfer Capability (ATC). This paper presents an integrated framework for evaluating impacts of DSM on ATC. A set of load management models for peak clipping/shifting and valley filling, strategic conservation and strategic load growth are presented. Composite DSM actions in the power system's diverse areas are also modeled. ATC evaluation procedure incorporated with DSM resources is given in sequential Monte Carlo simulation. The Liner-programming based ATC calculation model and time-varying load curves are employed to calculate ATC indices. The IEEE-RTS79 is used to illustrate the proposed approach and implement comparisons of impacts with and without DSM activity on ATC indices. © 2008 DRPT.

关键词： Demand side management

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Nonlinear PID controller of H-bridge cascade SSSC top level control

Nonlinear PID controller of H-bridge cascade SSSC top level ...

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3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Zhao, Yang Xiao, Xiangning Xudong, Jia IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9787900714138

As a series FACTS device based on Voltage Source Converter (VSC), Static Series Synchronous Compensators (SSSC) can optimize power flow and improve power system stability by controlling the line impedance rapidly. According to the three levels control structure of SSSC proposed in this paper, when SSSC middle level control operates at constant impedance mode, it has characteristic of controllable impedance as viewed from the top level. In this paper, the output of SSSC is equivalent to controllable impedance and then affine nonlinear equation of the single machine infinite bus (SMIB) power system including a SSSC can be obtained without the compound coordinate transformation approach which is proposed by other documentation and the feedback exact linearization method can be used directly to obtain the SSSC top level nonlinear controller. For avoiding solving the partial differential equation, the direct method is used to realize the exact linearization simply and conveniently. For overcome the shortcoming of low robustness of exact feedback linearization approach due to uncertainty of parameters and model of controlled system, the nonlinear PID control is used to design the SSSC top level controller. Finally the paper applies Real Time Digital Simulator (RTDS) to validate the feasibility of the proposed modeling and control approach in damping out power system oscillations. © 2008 DRPT.

关键词： Nonlinear equations

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Comparison between Hilbert space based power theory and Traditional power theory

Comparison between Hilbert space based power theory and Trad...

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2008 Joint International Conference on power system Technology powerCON and IEEE power India Conference, powerCON 2008

作者： Fei, Wang Zengqiang, Mi Qixun, Yang 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)9781424417629

The comparison between Hilbert space based power theory and three other power theories including traditional power theory , instantaneous power theory put forward by Akagi and Fryze power theory are analyzed in this paper. Theconsistency and difference are indicated in several different aspects: physical meaning, mathematical concept and the derivation of expressions. Analyses shows that traditional power theory can be regarded as a special case of Hilbert space based power theory, in other words, Hilbert space based power theory can be regarded as the generalization of traditional power theory. Fryze power theory is in accordance with Hilbert space based power theory in single-phase nonsinusoidal system, instantaneous power theory is in accordance with Hilbert space based power theory in three- phase symmetrical system without zero-sequence component. The definition of active current in Hilbert space based power theory is different from it in instantaneous power theory in three-phase system. © 2008 IEEE.

关键词： Hilbert spaces

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A spatial information-based self-adaptive differential evolution for distribution substations location and sizing

A spatial information-based self-adaptive differential evolu...

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2008 Pacific-Asia Workshop on Computational Intelligence and Industrial Application, PACIIA 2008

作者： Nian, Liu Jianhua, Zhang Wenxia, Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Changping Beijing 102206 China

ISBN: (纸本)9780769534909

The location and sizing of distribution substations integrated with urban spatial information is a optimization problem which primary characteristics are the existence of many suboptimal cost peaks and the solution space is on a discrete floating-point variables rage with some unfeasible area constraints. To solve this problem, a spatial information based parameter selfadaptive schema of DE (ISADE) is proposed The populations are formulated by spatial coordinates of candidate substation locations which chosen randomly and attempt to cover the entire planning area. A randomized self-adaptive scheme for DE mutation weighting factor F is used to increase the ability of searching out the global solution. The effectiveness of the proposed method is then tested on two practical substation planning areas of Beijing Electric power Corporation and the results are compared with PSO and standard DE. © 2008 IEEE.

关键词： Location

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