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2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Zhao, Chengyong Guo, Yanfen Li, Gengyin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003. Hebei Provinece China

ISBN: (纸本)0780391144

Detecting single-phase-to-ground fault is a difficult and challenging problem in the non-solidly grounded system that includes neutral point ungrounded, neutral point high-resistance grounded and neutral point compensated extinction coil grounded system. It is important to identify the faulted line quickly and exactly to reduce the time and effort necessary to locate and remove the fault, so that the probability of a second ground fault with its destructive currents can be reduced significantly. Based on analyzing the characteristics of the existing methods about identifying the faulted line in the non-solidly grounded system, the characteristics of the lines' zero-sequence current and the system's zero-sequence voltage and the relationship between every line's zero-sequence current and the system's zero-sequence voltage are analyzed deeply and a new method using similitude power to determine the faulted line is presented. The method can be applied to neutral point ungrounded system and neutral point ineffective grounded system to determine the faulted line accurately when resistance ground faults occur. Various ground faults under different conditions are simulated using MATLAB. The results show the method is feasible and effective. © 2005 IEEE.

关键词： Electric fault currents

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Multiagent and WAN based adaptive coordinated protection system

Multiagent and WAN based adaptive coordinated protection sys...

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2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Song, Shaoqun Zhu, Yongli Huang, Min Yu, Hong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding China North China Electric Power University Baoding China

ISBN: (纸本)0780391144

This paper presents a Multi-Agent and WAN Based Adaptive Coordinated protection system (MAWBACPS). The system utilizes IP Intranet to realize real-time wide area information exchange of a power system. Multi-agent system's several good qualities to solve distributing problems are used to realize the coordination of the operation settings of protective relays. A new idea of effortful adaptation for power system protection is proposed, and a new method to determine adaptive coordinated relay settings of lines are proposed in this paper. Moreover, the structure, communication mechanism and coordination control strategy of MAWBACPS, and relating agents' design are presented. Experiment results illustrate that MAWBACPS can realize the coordination of protections, enable the back-up relays to use their adaptive settings in most situations, and efficiently improve the security of power system. © 2005 IEEE.

关键词： Electric power transmission networks

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Decomposition on pollution current of load emitting and analysis of its influence on power price

Decomposition on pollution current of load emitting and anal...

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2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Jia, Xiufang Zhao, Chengyong Suo, Juan Li, Gengyin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Provinece China NCEPU School of Electrical Engineering NCEPU

ISBN: (纸本)0780391144

Along with the increment of disturbing loads in the power system, the effect on network that is brought by the power quality problems, become increasingly serious. Based on the market bargaining principles, the power price should be affected by the disturbance of loads. However current power price system fails to reflect the factor. Evaluation of load's disturbing property and analysis of its influence to power price is performed in this paper. The load current can be decomposed into three parts: instantaneous active current, instantaneous fundamental reactive current and instantaneous distorted current by the generalized instantaneous reactive power theory in dq0 coordinate system. The reactive current emission factor reflecting pure resistance of load and distorted current emission factor reflecting load's linearity are defined. According to these two factors, the evaluation method of the effect of the disturbing load on the power price based on allocating compensation equipment's cost is presented. The method provides some basis for contract's subscribing in the future. The calculated example shows the feasibility of above method, as well the degree of the influence of the disturbing load upon the power price. © 2005 IEEE.

关键词： Electric loads

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Research on the performance of wavelet packet transform based non-unit transient current protection

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese society of Electrical Engineering 2005年第SUPPL.期25卷 151-156页

作者： Wang, Zeng-Ping Liu, Hao-Fang Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Baoding 071003 China

The reflection and refraction of fault-generated wave on EHV lines were investigated and the equations of transient current detected by relay were deduced. Theoretical analysis shows that the protection based on the energy ratio of higher frequency components is more adaptive to various faults and can distinguish between the internal and external faults near the remote busbar more effectively. Such protection also has similar performance when used on EHV lines and series compensated EHV lines. The wavelet packet transform technique was employed to determine the energy ratio. Simulation results show that the proposed conclusions are correct.

关键词： Electric lines

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power system cascading outages assessment based on support vector machine

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese society of Electrical Engineering 2005年第SUPPL.期25卷 178-183页

作者： Deng, Hui-Qiong Ai, Xin Liu, Hao Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

A method of power system cascading outages assessment based on support vector machine (SVM) was provided in this paper. Taking full advantages of the ability of SVM to solve the problem with small sample, nonlinear and high dimension, this method constructs an assessment mode which uses resampling classification technique based on boosting method, pretreatment technique based on distance criterion and information fusion technique. This mode can help to improve the precision and stability of assessment, hence better generalization ability of assessment is guaranteed. At the end of this paper, an example is provided to demonstrate the validity of the proposed approach.

关键词： Electric power system protection

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Applied clusters and entropy in discreting attributes of load forecasting

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese society of Electrical Engineering 2005年第SUPPL.期25卷 65-70页

作者： Li, Jing-Hua Li, Ran Li, He-Ming Gu, Xue-Ping Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Baoding 071003 China

Attributes are require to be discrete when using data mining methods to establish forecasting model, for example, rough set, ANN and decision tree. But most discrete methods used before can't consider the relationship of conditional and decision attributes well, so the discrete results are not very satisfaction. This paper presents a new discrete method which combines clusters and entropy. First, cluster is adopted to get the waiting breakpoints. Then finally results are decided by their rate of entropy. According to clustering, the boundary value is greatly reduced. Meanwhile, through entropy which considers the condition attributes and decision attributes, attributes can be discreted more exactly. At last, the discrete results compared with the method based on the importance of breakpoints show that the proposed method assurance the quality of classing. The space of sample can be compressed effectively, which lightens the training load of model and the gotten rules are with good adaptability and useful value. The correctness and effectiveness are validated by the practical application and the accuracy of forecasting will be increased.

关键词： Electric load forecasting

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Data envelopment analysis based strategy of assessing schemes for power system black start

Data envelopment analysis based strategy of assessing scheme...

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2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Yan, Liu Gu, Xueping Zhang, Dan IEEE 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 Dispatching Center of Yunnan Power Company Kunming 650011 China

ISBN: (纸本)0780391144

Restoration of a power system after a complete blackout is a very important issue to the safety of the power system. Reasonable black start schemes arc necessary to restore the power system as soon as possible. Based on data envelopment analysis, a new strategy for assessing black start schemes is proposed in this paper. Schemes' technical verification is taken into consideration in the process of the assessment Whether a scheme is effective is defined by employing its input and output indexes' values entirely. The application to a practical power system verifies that the method could provide dispatchers more comprehensive and objective decision references. © 2005 IEEE.

关键词： Standby power systems

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Sensitivity analysis of parabolic lossy nonuniform transmission lines

Sensitivity analysis of parabolic lossy nonuniform transmiss...

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MAPE2005: IEEE 2005 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

作者： Liang, Gui-Shu Xu, Zhi-Hong Dong, Hua-Ying Ji, Changhu 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 Baoding Electrical Vocational and Technical College Baoding 071051 China

ISBN: (纸本)0780391284

The parabolic nonuniform line can be equivalent to the representation of a uniform line and a cascade connection of lumped element sections via Kuroda's Identities. Based on this equivalent circuit, a method in s-domain is present to obtain the sensitivity of output with respect to nonuniform line parameters, which calculates the sensitivities to uniform line and to lumped elements respectively. Final sensitivities in time domain are got by applying extended numerical inversion of Laplace transform(NILT). Examples and comparisons with sensitivity calculated by perturbation are presented. © 2005 IEEE.

关键词： Electric lines

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Load forecasting based on intelligence information processing

Load forecasting based on intelligence information processin...

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7th International power Engineering Conference, IPEC2005

作者： Zheng, Hua Xie, Li Zhang, Li-Zi Electricity Market Research Institute North China Electric Power University Beijing 102206 China 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)9810544693

In electricity market, it is widely accepted that short-term load forecast is a key problem of market operation. In this paper, a novel model for load forecasting based on Intelligence Information Processing is presented. Here, we make full use of the excellent property reconstruction ability of independent component analysis, which is a new intelligence information processing technology for separating signals and making them independent mutually, and presents STLF model based independent property reconstruction. The load properties of different kinds are restructured to enhance its representation ability and simplifying STLF modeling by ANN. After neural network is trained by new properties with lower dimension, STLF model is built. Finally, the real load data of spot market in New England is applied to demonstrate the validity of the proposed approach.

关键词： Electric load forecasting

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Sensitivity analysis of parabolic lossless nonuniform transmission lines based on port voltages and currents

Sensitivity analysis of parabolic lossless nonuniform transm...

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MAPE2005: IEEE 2005 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

作者： Liang, Gui-Shu Qi, Fang Dong, Hua-Ying Ji, Chang-Hu 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 Baoding Electrical Vocational and Technical College Baoding 071051 China

ISBN: (纸本)0780391284

This paper presents a new method of frequency-domain sensitivity analysis for parabolic lossless nonuniform transmission line. The frequency-domain sensitivity formulas are expressed by the line port voltages and currents. Therefore this method can avoid the possible numerical instability caused by negative capacitance in Kuroda's identity in [5]. Examples and comparisons with sensitivity determined by perturbation are presented. © 2005 IEEE.

关键词： Transmission line theory

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