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Temporary overvoltage classified identifying method of power distribution network and device thereof

A classification identification and overvoltage technology, applied in the field of distribution network, can solve problems such as low efficiency, low accuracy rate, lack of overvoltage type identification ability, etc., and achieve the effect of simple algorithm, less calculation time and strong adaptability

Active Publication Date: 2017-05-31
FUZHOU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing overvoltage monitoring devices do not have the ability to identify overvoltage types, and more are judged by manual experience, with low efficiency and low accuracy

Method used

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  • Temporary overvoltage classified identifying method of power distribution network and device thereof
  • Temporary overvoltage classified identifying method of power distribution network and device thereof
  • Temporary overvoltage classified identifying method of power distribution network and device thereof

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] This embodiment provides a method for classifying and identifying temporary overvoltages in distribution networks, such as figure 1 shown, including the following steps:

[0043] Step S1: after the overvoltage occurs in the distribution network, obtain the waveform sampling data of the bus three-phase voltage and zero-sequence voltage for a period of time before and after the overvoltage occurs;

[0044] Step S2: Calculate the energy contribution rate E of the two power frequency cycles after the fault on the zero-sequence voltage sampling data obtained in step S1, and judge whether E is greater than the threshold value. If so, it is judged as operating overvoltage, and the identification process ends; this step specifically includes the following step:

[0045] Step S21: Calculate the ratio E of the energy of the two cycles of the signal after...

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Abstract

The invention relates to a temporary overvoltage classified identifying method of a power distribution network and a device thereof; the method mainly includes steps of acquiring waveform sampling data, calculating energy contribution rate and singular spectrum entropy of sampling data, extracting the time domain energy distribution characteristics of the sampling data, performing local characteristics scale decomposition and band pass filtering on the sampling data so as to acquire a gravity frequency band; combining with a threshold value judging method, realizing the temporary overvoltage type identification of the power distribution network. The method and device need not a classifier, and are simple in algorithm and few in calculation time, and can exactly identify five types of overvoltage of the power distribution network, which are single-phase metal grounding, intermittent arc light grounding, high-frequency resonance, base frequency resonance, fractional frequency resonance; the temporary overvoltage classified identifying method of the power distribution network has strong adaptive capacity, and still has high overvoltage type identifying accuracy under the working condition of noise disturbance.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to a method and device for identifying temporary overvoltage types of a distribution network. Background technique [0002] Operation experience shows that overvoltage is one of the important factors affecting the safe operation of distribution network. Temporary overvoltage lasts for a long time, which can easily cause equipment insulation damage, thereby causing various short-circuit faults and endangering the reliability of power supply of the distribution network. Therefore, it is very necessary to detect the overvoltage in the distribution network in time and accurately distinguish the type of overvoltage for the disaster prevention and fault analysis of the distribution network. However, the existing overvoltage monitoring devices do not have the ability to identify overvoltage types, and more are judged by manual experience, with low efficiency and low accuracy. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165
CPCG01R19/16528
Inventor 高伟许立彬郭谋发洪翠
Owner FUZHOU UNIV
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