Bayesian analysis based fault locating method of power distribution network

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...

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 limited by the PT capacity, and when the distribution network line is long and the fault grounding resistance is large, the shunt effect of the line-to-ground capacitance will make the signal of the fault branch circuit smaller and cause misjudgment

Most of the existing wide-area communication methods require wide-area synchronous measurement information, and signal delay or communication loss will lead to wrong positioning results.

[0004] Therefore, the problem of fault location in the distribution network has not been effectively solved to a certain extent, and it is necessary to propose a method that is simpler, more efficient and has higher fault tolerance

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