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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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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...

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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 ...

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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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Study on the Frequency Spectrums of Acoustic Emission PD Signals in XLPE Cable Accessories

Study on the Frequency Spectrums of Acoustic Emission PD Sig...

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International Conference on Condition monitoring and Diagnosis

作者： Wei Wang Xu Cheng Chong Liu Zhifu Yang Heming Huang Qiang Xue 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 102206 P. R. China Beijing ElectricTest And Research Institute Beijing 100075 China

ISBN: (纸本)9781424416219

In this paper, four 110kV prefabricated cable joints models containing four kinds of known representative insulation defects were designed. The models can simulate some typical PD phenomena, such as sliding discharge, floating discharge, cavity discharge and protrusion discharge. Based on them, type frequency spectrums of AE PD signals in XLPE cable joints were studied. The investigation indicated that the main frequency component of AE PD signals for XLPE cable is less than 400kHz;the attenuation of higher frequency component is very fast;the energy is relatively centralized in 50～250kHz;the sensitivity in this band is very high;the characteristics of different PD models are apparently dissimilar from each other. The obtained results provided basis for future investigation on PD pattern identification.

关键词： AE Attenuation Frequency spectrums Insulation defects PD characters PD models

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Time series online prediction algorithm based on least squares support vector machine

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Journal of Central South University of Technology 2007年第3期14卷 442-446页

作者：吴琼刘文颖杨以涵 Key Laboratory of Power System Protection and Dynamic Security Monitory and Control of Ministry of Education North China Electric Power University

Deficiencies of applying the traditional least squares support vector machine （LS-SVM） to time series online prediction were specified. According to the kernel function matrix＇s property and using the recursive calculation of block matrix, a new time series online prediction algorithm based on improved LS-SVM was proposed. The historical training results were fully utilized and the computing speed of LS-SVM was enhanced. Then, the improved algorithm was applied to timc series online prediction. Based on the operational data provided by the Northwest power Grid of China, the method was used in the transient stability prediction of electric power system. The results show that, compared with the calculation time of the traditional LS-SVM（75 1 600 ms）, that of the proposed method in different time windows is 40-60 ms, proposed method is above 0.8. So the improved method is online prediction. and the prediction accuracy（normalized root mean squared error） of the better than the traditional LS-SVM and more suitable for time series online prediction.

关键词： time series prediction machine learning support vector machine statistical learning theory

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Research on temperature field of turbo-generators based on coupled physical field

Research on temperature field of turbo-generators based on c...

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International Conference on Electrical Machines and systems, ICEMS 2007

作者： Junqing, Li Shaoli, Ma Heming, Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 China

ISBN: (纸本)8986510081

Temperature is one of the important physical variables in turbo-generators, so accurate prediction of temperature is very necessary in generators design and operation. This paper presents coupling mathematical model of electromagnetic and temperature field and calculates them by finite element method (FEM). First, magnetic field distribution of generators is accurately determined, so thermal source is known. Then, the mathematical model of temperature field is proposed, and temperature filed can be obtained. Couple Hield of electromagnetic and temperature in QFSN-200-2 turbo-generators is calculated by finite element analysis software (ANSYS), the proposed method is validated to be correct by comparing calculation and measurement values.

关键词： Electromagnetic fields

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Hybrid non-linear state estimation with voltage phasor measurements

Hybrid non-linear state estimation with voltage phasor measu...

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2007 IEEE power Engineering Society General Meeting, PES

作者： Qin, Xiaohui Bi, Tianshu Yang, Qixun IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)1424412986

In this paper, a new method of hybrid non-linear state estimation with PMU is proposed. Firstly, the voltage phasor measurements are transformed into indirect equivalent branch current measurements, with which the conventional state estimator takes the impact of PMU into consideration. Secondly, the indirect measurement errors caused by the measurement transforming are analyzed and calculated in detail. Thirdly, the accuracy of hybrid estimator is analyzed in the paper. The simulation results show that the proposed method improves the accuracy of estimator and the convergence speed also. © 2007 IEEE.

关键词： State estimation

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Multi-layer disturbance processing system based on multiple information sources

Multi-layer disturbance processing system based on multiple ...

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2007 IEEE power Engineering Society General Meeting, PES

作者： Bi, Tianshu Li, Qian IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)1424412986

More and more IEDs have been commissioned in power systems, such as digital relays, PMUs, metering and control devices, fault recorders and so on. Once there is a disturbance (for example, fault, low-frequency oscillation, etc.), large amount of information will pour into the control center. Therefore, how to identify the disturbance and then take corresponding countermeasures is crucial for power system security and reliability. A multi-layer disturbance processing system based on multiple information sources is proposed in this paper. Firstly, the characteristics of different kinds of information sources, including PMUs, RTUs, digital relays and fault recorders, are analyzed. Secondly, according to the arrival times of the information, the framework and functions of multi-layer fault diagnosis system is presented in detail. After a disturbance occurs, the suggested system could realize disturbance identification, fault element diagnosis and detailed post-fault analysis in succession at different time frames with the information coming, which fits the needs of operators well. © 2007 IEEE.

关键词： Information systems

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power system dynamic simulation validation based on similarity theory and analytical hierarchy process

Power system dynamic simulation validation based on similari...

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2006 International Conference on power system Technology, powerCON2006

作者： Han, Dong He, Renmu Ma, Jin 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)1424401119

Simulation assessment of error and veracity is the precondition in power system dynamic simulation validation that is directly related to power system stability. Own to the applications of Wide Area Measurement system (WAMS) that could provide synchronous measured information of power grid, it is possible to assess dynamic simulation. Based on the principles of similarity theory and Analytical Hierarchy Process (AHP), this paper proposes general assessment method on amplitude similarity degree of simulation and its relative error criterion by analyzing the characteristics of power system dynamic stability and variables. This method could not only systematically reflect the similarity degree of whole system and every time period, but also provide objective quantitative information and reference for further model validation and parameter correction. A case study is presented to verify the proposed method on the basis of the measured data from WAMS of certain power grid. © 2006 IEEE.

关键词： Circuit simulation

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