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Research on Failure Risk Assessment and Maintenance Tactics of Transformer based on the Extension Engineering Method and IAHP

Research on Failure Risk Assessment and Maintenance Tactics ...

引用

International Conference on High Voltage Engineering and Application, ICHVE

作者： Qing Xie Yun Li Yunpeng Liu Yanqing Li Fangcheng Lv Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding Hebei China Wuhan High-Voltage Research Institute Baoding Hebei China

There are many failure modes of transformer, and their probability and failure severity differ from each other. Based on the statistic data and experts advice, the probability of all failure modes are calculated, and divided into 5 grades. Meanwhile, IAHP was applied to calculate the weight of the transformer failure information, and Extension evaluation method was employed to create the frame work of the severities of failure modes qualitatively and divided them into 5 grades as well. Then, risk matrix is adopted to describe risk grades of failure modes, and power transformer risk maintenance strategies are obtained.

关键词： Risk management power transformers Failure analysis Risk analysis power system security Maintenance power system reliability power engineering and energy Probability protection

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Experimental study on relationships between partial discharge signals and apparent discharge magnitude in XLPE cable

Experimental study on relationships between partial discharg...

引用

International Conference on Condition monitoring and Diagnosis, CMD

作者： Wei Wang Xu Cheng Chong Liu Fei Zong Xueliang Shen Beijing Key Laboratory of High Voltage & EMC Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Beijing Electric Test and Research Institute Beijing China

ISBN: (纸本)9781424416219

Based on the experiment carried out in the lab on several cables in which there are some typical PD models, the relationship between the single acoustic signal generated by the partial discharge and the apparent discharge magnitude in a line frequency cycle are researched. Further more, through the detection system which is combined of the VHF PD detection method and the acoustic emission detection method, the expressions of the relationship between the voltage value, which is gotten directly from the detection system and the apparent discharge magnitude are gotten by the curve fitting method. At the same time, the method of locating the defect manually with the acoustic sensor is introduced simply in the paper.

关键词： Partial discharges Acoustic signal detection Acoustic emission Cables Signal generators Frequency Voltage Fault location Curve fitting Acoustic sensors

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Detection method of partial discharge in XLPE Cable accessories based on the method of VHF combined with acoustic emission

Detection method of partial discharge in XLPE Cable accessor...

引用

International Symposium on Electrical Insulating Materials

ISBN: (纸本)9784886860057

Based on the experiment carried out in the lab on several cable accessories in which there are some typical PD models(In this paper, they are the models of protrusion discharge and floating discharge), the method of VHF Combined with acoustic emission (AE) for detecting PD in the XLPE cable accessories was introduced. The time domain characters of the AE and VHF signals are researched and compared in order to distinguish the PD signal from the disturbance. Two kinds PD spectrum of Qmax-phi and N-phi were analyzed and contrasted between the VHF and acoustic emission PD signals, which are protrusion discharge and floating discharge. The way to locate the PD point was also introduced. The results of the research had proved that the reliability of the PD detection is improved using the combined method.

关键词： Partial discharges Acoustic emission power cables Discharges Joints Fault location Acoustics

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Multi-target controller of three-level NPC based VSC-HVDC transmission system and Its RTDS simulation

Multi-target controller of three-level NPC based VSC-HVDC tr...

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IEEE International Conference on Sustainable Energy Technologies, ICSET

作者： Jianhua Zhang Sheng Li Jingfu Shang Weiwei Zhao Chunye Li Department of Electrical Engineering the School of Electrical and Electronic Engineering North China Electric Power University Beijing China Key laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education Beijing China College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

This paper builds the dynamic mathematic model of the three-level Neutral Point Diode Clamped (NPC) converter, discusses the fundamental principles of the active and reactive power control for three-level Voltage Source Converter based HVDC (VSC-HVDC) system. To fully utilize the controllability of VSC-HVDC, multi-target controller is developed to control AC and DC system respectively. Improved sine wave PWM (ISPWM) technique is designed to raise the DC voltage utility rate. Real time digital simulation (RTDS) is done to verify the validity of the proposed control strategy and controllers and demonstrate the good performance of VSC-HVDC.

关键词： Converters power conversion control systems Pulse width modulation Mathematics Mathematical model power system modeling Diodes Reactive power control HVDC transmission

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A new solution to generators start-up sequence during power system restoration

A new solution to generators start-up sequence during power ...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Qiang Liu Libao Shi Ming Zhou Gengyin Li Yixin Ni Key Laboratory of Power System Protection and Dynamic Security Monitoring and Contro under Ministry of Education North China Electric Power University Baoding China National Key Laboratory of Power Systems Shenzhen Tsinghua University Shenzhen China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

Optimal generators start-up strategy in the restorative control of a power system following a blackout is a complex, multi-stage decision optimization problem. A novel solution strategy involving the corresponding model and approach to this problem is presented in this paper. The aim of the method is to maximize the total MWh load served over a restoration period whilst considering the corresponding constraints. The proposed model is first discretized as a series of knapsack problems with respect to each time step. The classic backtracking search method is employed to solve those knapsack problems. Moreover, the optimal generators start-up solution procedure is illustrated as well. The proposed method, to some extent, can make the trade off between the simulation precision and the computing efforts better. Case studies based on a modified 15-generator test system as benchmark are carried out to demonstrate the effectiveness and validity of the proposed model and method.

关键词： power generation power system restoration power system control power system modeling Optimal control control systems power systems Search methods Computational modeling system testing

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A power price forecasting method based on nonparametric GARCH model

A power price forecasting method based on nonparametric GARC...

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

作者： Hong, Li Hao, Xiong Weiguo, Li Yi, Sun Guoyi, Xu IEEE North China Electric Power University Wuhan University Beijing Institute North China Electrical Power University Electrical Engineering School North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control

ISBN: (纸本)9787900714138

Based on nonparametric conditional heteroscedasticity estimation theory, an improved power price forecasting method is proposed in this paper. In this method, according to the practical power price curve, conditional variance function is built and the model is determined by nonparametric estimation method. Besides, in the nonparametric estimation process, the iterative estimation algorithm is introduced to deal with the problem where conditional standard deviation is unpredictable. And the estimation credence of conditional variance function is improved by continually modifying the estimation value of conditional standard deviation as input variance. On the research of day-ahead time series fluctuation characteristics of power price in California in 2000, the time series of Humb node is modeled and forecasted. And the test results show that the model proposed in this paper can better reflect time series volatility clustering characteristics of power price, and it can improve forecasting effect of peak power price by using nonparametric estimation theory. © 2008 DRPT.

关键词： Time series

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A novel approach to eliminate zero-sequence harmonics current

A novel approach to eliminate zero-sequence harmonics curren...

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IEEE Asia-Pacific Conference on Circuits and systems

作者： Qipeng Song Zhongdong Yin Chengxi Dai Changyin Zhang Weidong Shang Zhonghua Huang Key Laboratory of Power System Protection and Dynamic Monitoring and Control Ministry of Education University Beijing China Kaifeng Power Supply Corporation Kaifeng China Kaifeng Power Supply Corporation The state grid corporation of China Kaifeng

Zero-sequence harmonics caused by nonlinear loads usually result in high voltage distortion levels throughout the facility, neutral conductor overloading, motor heating, transformer heating, increased losses, and excessive harmonic injection onto the utility supply system. This paper presents a novel method to eliminate zero-sequence harmonics by using Zero-sequence Resister Block (ZRB) and Zig-Zag transformer. Zig-Zag transformer is a special connection of three-phase transformerpsilas windings. The ZRB is also a special connected transformer, whose three windings are wounded in the same core. The ZRB has zero reactance for positive and negative-sequence components but giving three times of self-reactance for zero-sequence reactance. In this paper, an analysis is carried out; simulations and laboratory tests are used to evaluate the performance of the Zig-Zag transformer and ZRB under various system conditions. The simulation and laboratory test results indicate that the combination of ZRB and Zig-Zag transformer as filter is a better and effective way to attenuate the neutral current, which also provides an innovational way to improve power quality.

关键词： power harmonic filters Heating Laboratories Harmonic distortion Conductors Transformer cores Performance analysis Analytical models system testing power quality

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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 Electric Utility Deregulation and Restructuring and power Technologies (DRPT 2008), vol.1

作者： Xiao-yu Zheng Jin Ma Ren-mu He Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

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.

关键词： Cluster analysis Measurement-based load modeling Load classification Model generalization

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Novel HV circuit breaker reliability testing measure based on image processing

Novel HV circuit breaker reliability testing measure based o...

引用

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

作者： Guiyan, Cui Shutao, Zhao Chenguang, Zhao Baoshu, Li Department of Electric and Electronic Engineering School of North China Electric Power University Baoding 071003 Hebei Province China 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 North China Electric University China

ISBN: (纸本)9781424417629

Aimed at the difficulty of sensors installation in high-voltage (HV) circuit test experiment, a novel image processing based measure is put forward to detect the mechanical parameters. Through the on-off action images were captured by digital camera with the HV circuit breaker switching, the moving contact travel parameter can be calculated from image analyzing. At the meantime, the necessary timing or interval parameter can be calculated by the electrical signal processing. So most of other key mechanical characteristic parameters, include moving contactor trip, average velocity, bounce frequency, switching time-consuming and over-travel etc., can be also derived associated with the moving travel parameter and time-signal set. It is a non-contact measurement method, which can instead of grating sensor installed on the HV circuit breaker. Experiments result that this new method can obtain the HV circuit breaker mechanical parameter accurately, and it can increase the testing automatic level greatly. © 2008 IEEE.

关键词： Travel time

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Impact of Fault Clearing Time on Shaft Torque Amplification in Series Compensated system

Impact of Fault Clearing Time on Shaft Torque Amplification ...

引用

3rd International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT 2008), vol.2

作者： Yuhang Luo Tianshu Bi Tao Zhang Qixun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring & Control (MOE) North China Electric Power University Beijing China Beijing Sifang Automation Company Limited Beijing China

Series capacitor compensation in AC transmission systems may cause subsynchronous resonance (SSR) that can lead to turbine-generator shaft fatigue. One of the SSR phenomenons is referred to as shaft torque amplification, which might cause serious damage to the shaft. A methodology considering shaft torque as the torsional system response of applied force is given in this paper. The maximum shaft torque is finally deduced as an analytic function of fault clearing time using a simplified two-^sDOF model. The conclusion could be obtained that fault clearing at odd numbers of half cycles of the dominant torsional mode will generally provide maximum torques. Simulation results demonstrate the validity of the conclusion, which helps in choosing a proper fault clearing time that could avoid shaft damage and decrease reduction of shaft life efficiently.

关键词： Fault clearing time Shaft impact torque Shaft torque amplification Subsynchronous resonance Two-DOF system

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