Bayesian analysis based fault locating method of power distribution network

A technology for distribution network faults and positioning methods, which is applied to fault locations, fault detection according to conductor types, and electrical measurement. It can solve problems such as wrong positioning results, signal delay communication, and loss, and achieve high fault tolerance. The principle of the method is simple Effect

Inactive Publication Date: 2018-12-11
GUANGDONG POWER GRID CO LTD +1
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AI Technical Summary

Problems solved by technology

The impedance method is simple in principle and requires less investment, but it is easily affected by changes in power supply parameters and load parameters, and when there are many branches and complex structures, false fault points may appear
In principle, the traveling wave method is not affected by factors such as system parameters, the size of the transition resistance, and the operating mode of the system, but it is difficult to achieve accurate and synchronous acquisition of multi-terminal traveling wave signals in the distribution network, and the investment is relatively large
The signal strength of the injection signal tracing method is limite

Method used

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  • Bayesian analysis based fault locating method of power distribution network
  • Bayesian analysis based fault locating method of power distribution network
  • Bayesian analysis based fault locating method of power distribution network

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Embodiment

[0034] figure 1 It is a flow chart of a distribution network fault location method based on Bayesian analysis of the present invention, comprising the following steps:

[0035] S1. The circuit breaker and section switch in the distribution network are regarded as vertices, and the feeder section is regarded as an arc, and the direction of the arc is the direction of the power flow on the line, and the distribution network is mapped into a directed graph; and according to the FTU The historical operation record statistics get the correct or wrong frequency of information, which in turn acts as a probability;

[0036] S2. According to the directed graph of the distribution network, the ideal overcurrent information and current change rate information uploaded by the feeder terminal equipment FTU when faults occur in each area are obtained;

[0037] S3. Comparing the ideal information with the actual uploaded information, and using Yebesian analysis to obtain the probability of ...

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Abstract

The invention relates to a Bayesian analysis based fault locating method of a power distribution network, and belongs to the field of fault diagnosis of the AC power distribution network. When a faultoccurs, feed line terminal equipment uploads over current information and current change rate information, the probability that information received by a main station is correct or wrong is calculated, Bayesian analysis is used by using redundancy of two types of information to solve the probability that each area has the fault, the area with the highest fault occurrence probability is seen as afault area, thus, the fault is located. According to the method, it is not required to change the main station with the automatic power distribution system or transmit waveform information, the errortolerance rate is higher, and the application prospects are wide.

Description

technical field [0001] The invention relates to the field of fault diagnosis of an AC distribution network, and more specifically, to a distribution network fault location method based on Bayesian analysis. Background technique [0002] As the end of the power network, the distribution network is directly connected to users. It can keenly reflect the user's requirements for power supply safety and quality. Its operation safety, reliability and economy are directly related to social production and people's life. The research on distribution network fault location technology is a basic work to ensure the safe and reliable operation of smart grid, which has important practical significance. [0003] At present, the fault location methods of distribution network mainly include impedance method, injected signal tracing method, traveling wave method and wide area communication method. The impedance method is simple in principle and requires less investment, but it is easily affec...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 詹雄铿余泓圻李钙程向文陈晓科伍海明陈岭辉邹松青王彩强王庆斌黄辉徐锐波吴润西
Owner GUANGDONG POWER GRID CO LTD
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