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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Yagang Zhang Jing Ma Jinfang Zhang Zengping Wang Key Lab. of Power Syst. Protection & Dynamic Security Monitoring & Control under Minist. of Educ. North China Electr. Power Univ. Baoding

In wide area backup protection of electric power systems, the prerequisite of protection device's accurate, fast and reliable performance is its corresponding fault type and fault location can be discriminated quickly and defined exactly. In our researches, global information has been introduced into the backup protection system. By analyzing and computing real-time PMU measurements, basing on cluster analysis theory, we are using mainly hierarchical cluster analysis technology to seek after for the statistical laws of electrical quantities' marked changes. Then we carry out fast and exact identification of faulty components and faulty sections, and finally accomplish fault isolation. Multivariate statistical analysis theory is an efficient theory that can resolve different kinds of complex problems. It has been applied successfully in many researches of various fields, such as geology, weather, hydrology, iatrology, industry, agriculture, and economy, etc. In the study of electric power systems, multivariate statistical analysis theory must also have a good prospect of application.

关键词： Fault diagnosis power system protection power system reliability Statistical analysis Fault location power system analysis computing Phasor measurement units Electric variables measurement Isolation technology Geology

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Simulation and comparison of transient stability of power system including DFIGs wind farm based on detailed model

Simulation and comparison of transient stability of power sy...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Li Lin Hongjing Hou Wenxia Li Sheng Jing Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Production & Technology Department Zhumadian Electric Power Company Henan China

This article is concerned with the impact of large-scale wind farms utilizing double fed induction generator (DFIG) on the transient stability to a general power system. In the first instance, the synthetical dynamic model of the wind turbine generators (WTGs) is introduced, including pitch angle control model and the generator protective model. And then, the simulation is made to the CIGRE B4-39 standard grid through the comparison between synchronous generator integration and wind farm based DFIG integration with the same power capacity. The simulation is also contained after the load and the topological structure changed. The conclusion shows that the transient stability of the power system including DFIGs wind farm is more robust than conventional synchronous generator connected.

关键词： power system simulation power system transients power system stability power system modeling Wind farms power system dynamics Induction generators power system protection Wind energy generation Synchronous generators

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Method for PD location in oil combining ultrasonic phased array with wideband array signal processing

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2009年第28期29卷 13-17页

作者： Xie, Qing Li, Yan-Qing Lü, Fang-Cheng Li, Cheng-Rong Wang, Nan Ding, Yu-Jian Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Changping District Beijing 102206 China Beijing Key Laboratory of High Voltage and EMC North China Electric Power University Changping District Beijing 102206 China China Electric Power Research Institute Haidian District Beijing 100192 China

A new method for partial discharge (PD) location in oil is presented based on ultrasonic phased array and wideband array signal processing. Firstly, the wideband ultrasonic signal of PD is measured directly by the ultrasonic phased array sensor and the array signal model is formed. Secondly, according to the frequency characteristic of the ultrasonic signal between 50 kHz to 300 kHz, the method of rotational signal subspace (RSS) is used to focus processing, which can convert the signal direction matrix under different frequencies to the same center frequency by focusing matrix. RSS can reserve the information maximally to realize the direction information accumulation of wideband signals. Finally estimation and location of the PD source signal's direction of arrival (DOA) are realized by means of the multiple signal classification (MUSIC) and crossover locating principle. The method is validated by the results of the experimental research. © 2009 Chin. Sco. for Elec. Eng.

关键词： Location

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A study on VSC-HVDC based black start compared with traditional black start

A study on VSC-HVDC based black start compared with traditio...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Sheng Li Mingxia Zhou Zongqi Liu Jianhua Zhang Yinhui Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China Department of Electrical Engineering School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781424449347

A good black-start scheme is important and necessary to resume power supply fast and efficiently after black out, and how to choose black-start power is the first thing to consider in the scheme. In this paper, the advantages of VSC-HVDC as black start power are analyzed with contrast to traditional black start power. The ability of VSC-HVDC to soft energize major power system equipment is proved through simulation by software PSCAD/EMTDC. Simulation waveforms during soft energization are illustrated. These plots have described the good voltage and frequency characteristics of VSC-HVDC. The transition from one control mode of VSC to another is also discussed. Simulation results indicate that by using soft energization, VSC-HVDC is an ideal black start power.

关键词： Converters power conversion PSCAD power system harmonics power system simulation power system restoration Voltage control power system transients Frequency Transformers

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Validating measurement-based composite load model

Validating measurement-based composite load model

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8th International Conference on Advances in power system control, Operation and Management (APSCOM 2009)

作者： Jin Ma Xiao-yu Zheng Yong-hong Tang Zhao-yang Dong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Sichuan Electric Power Research Institute Chengdu China Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China

Since the digital simulation is one of the basic tools in understanding the modern complex power systems, its veracity has direct effects on the decision making on the power system operation and control. However, the accuracy of the digital simulation is dependant heavily on the model validity. Among all the dynamic components of the power system, the load is one of the most difficult one to be modeled. The difficulty lies in the fact that the scenario when the load model is built is always different from the real situation raised by the faults. So the question naturally arises that whether the measurement-based load model could be applied in the digital simulation when analyzing different operation scenarios. And to what extent does the model keep valid? It is hard to answer these questions because the field data, which constitute the basis of the measurement-based load modeling, are limited. This paper reports our work on validating the load model via RTDS. By simulating various fault situations on a model of a real provincial power system in RTDS, we could get a great amount of data to build the model as well as research its validity. Two greatly concerned problems related to the measurement-based load model are addressed in this paper; one is the possibility of applying the load model for various fault scenarios and the other is the validity of the load model when the load composition changes. Suggestions for the measurement-based load modeling practice are also given from the model validation work.

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Modal analysis concerning the control mode of doubly-fed induction generator

Modal analysis concerning the control mode of doubly-fed ind...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Li Lin Liangliang Song Wenxia Li Sheng Jing Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Henan Electric Power Technical Institute Management of Production & Technology Department Zhumadian Electric Power Company China

The paper deals with the impact of wind power integration on power system small signal stability. The DFIG wind turbine consisting of a back-to-back PWM converter is introduced. Generator model is given first, ignoring the transient of stator. The converter control, shaft and pitch angle control diagrams are picked out for a detailed study subsequently. A case study is performed in part three, eigen-analysis of a modified IEEE 14 system is conducted considering the PF and VT control modes of wind farm. The pole map gives an intuitionistic view that DFIG introduces two oscillation modes related to the shaft and VAR controller model respectively. Eigen-structure depicts the electromechanical oscillation modes, and comparison of DFIG and SG case was studied which gives an overall conclusion that DFIG can have a favorable performance. Also the influence of increased penetration of wind power is examined.

关键词： Modal analysis Induction generators power system modeling Wind energy power system stability power system transients Shafts power system analysis computing Wind turbines Pulse width modulation converters

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Graph-based optimal solution for siting and sizing of grid-connected distributed generation

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2009年第4期29卷 91-96页

作者： Li, Peng Lian, Chao Li, Bo-Tao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Baoding 071003 China

Besides the conventional benefit of improving power flow, distributed generation (DG) can also be used to mitigate voltage sag and reduce line loss. In this paper, a graph and gene based algorithm was proposed to address the optimal location and capability for grid-connected DG, under the assumption of the radial distribution network and static constant power load model, meanwhile taking the characteristic of DG and its effect on network losses and voltage into consideration. This algorithm used graphic methods to solve a large number of equations. This effectively simplified the complicated process and numerous assumptions in the traditional method. Genetic algorithm with voltage boundary violation constraints was utilized to effectively prevent the bus voltage from reaching its upper boundary. Simulation of the benchmark examples and the comparsion with traditional methods show the correctness and feasibility of the proposed method. © 2009 Chin. Soc. for Elec. Eng.

关键词： Distributed power generation

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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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Transformer Partial Discharge Sources Number Estimation Based on Ultrasonic Array Sensors and Modified CCT

Transformer Partial Discharge Sources Number Estimation Base...

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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： Qing XIE Xin XIANG Nan WANG 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

Correctly estimated the number of partial discharge (PD) source is the premise of the power transformer PD location based on ultrasonic array sensors. Therefore, estimation of the number of power transformer PD source is a very necessary research work. In this paper, we proposed the modified Canonical Correlation Technique (CCT) to estimate the number of transformer PD source. The simulation experiment results confirm the validity of the method.

关键词： Transformer Partial discharge Sub-band averaging CCT number estimation

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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...

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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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