Power system electric transmission line fault diagnosis method

A technology for short-circuit faults of transmission lines, applied in the field of short-circuit fault diagnosis of power system transmission lines, can solve problems that are not conducive to the stability and economical operation of power systems, poor versatility, and not well applicable to practical applications, etc.

Active Publication Date: 2014-04-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, for field practice, the system designed by this method is complex and cannot be well applied to practical applications, and there are various differences in different fie

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  • Power system electric transmission line fault diagnosis method
  • Power system electric transmission line fault diagnosis method
  • Power system electric transmission line fault diagnosis method

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Embodiment Construction

[0044] The object of the present invention is to provide a method for diagnosing short circuit faults of power system transmission lines. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Although some new heuristic algorithms, such as neural networks, Bayesian networks, fuzzy set algorithms, etc., have been studied in the field of power system fault judgment, many of these studies are in the theoretical research stage, and practical application limitations are very large. . Faced with a large number of nodes and a complex regional transmission network, these methods are difficult to apply. The method proposed by the present invention based on wavelet conversion and using wavelet energy entropy to judge the transmission line fault has strong versatility, fast diagnosis speed, and can be well applied to actual systems. In order to verify the validity of the power system transmission line ...

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Abstract

The invention discloses a novel power system electric transmission line fault diagnosis method. The method includes the steps that first, fault recording wave signals of an electric transmission line are extracted, and a three-phase current value and a discrete value of an earth current of the electric transmission line are obtained through discrete wavelet transform; then, according to a wavelet function db10, the wavelet coefficient entropy of each phase current is calculated, the sum of the wavelet coefficient absolute entropy of all the phase currents is calculated, and the largest value phase, the smallest value phase and the medium value phase of the three values are determined through comparison. According to the designed algorithm, the type and the phase of a fault which happens to a circuit where input current signals are located are judged. The algorithm relates to three parameters, and the parameters are set through a training set; model accuracy verification is performed through a test set, and meanwhile the parameters are corrected. With the method, whether a fault happens to the circuit and the type of the fault can be fast judged, and therefore good assistance effect is played for on-site dispatch personnel to fast and accurately position a fault area after the fault happens, and the security and the stability of the electric transmission line can be improved easily.

Description

Technical field [0001] The invention belongs to the technical field of power system transmission safety, and particularly relates to a method for diagnosing short circuit faults of power system transmission lines. Background technique [0002] On the one hand, the transmission line spans a large spatial distance, generally tens to thousands of kilometers. On the other hand, it is exposed to the outdoors with harsh environmental conditions for a long time and cannot be effectively maintained. Compared with other electrical components, the conditions of the transmission line are It is determined that it is the most vulnerable part of the power system. The most common and also the most dangerous fault on the transmission line is the abnormal connection between phase and phase or between phase and ground, that is, short circuit. These faults are divided into single-phase grounding short circuit, two-phase interphase short circuit, two-phase grounding short circuit and three-phase gr...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 史永锋师瑞峰郑士尧
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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