Fault section locating method of power distribution network based on limited PMU

Abstract

The invention discloses a fault section locating method of a power distribution network based on limited PMU. According to the method, real-time dynamic voltage and current information of the power distribution line is measured by the PMU, when a fault occurs in the power distribution network, the real-time voltage and current information collected by the tail-end PMU is used to calculate the head-end voltage of each feed line in the same branch point, and the voltages in the branch point is analyzed to determine a fault section. The fault section of the power distribution network can be located effectively, the difficulty that too many branch lines are included in fault locating of the power distribution network is overcome, the method is avoided from influence of the transitional resistor and the fault type, it is not required to mount the PMU in the two ends, cost of equipment is reduced, the cost is low, the method can be used to locate the fault section effectively, the operational reliability and security of the system is increased greatly, and the application prospects are better.

Description

technical field [0001] The invention belongs to the application field of distribution network fault location, and in particular relates to a method for locating a distribution network fault section based on a limited PMU. Background technique [0002] As the end of the power system, the distribution network is directly related to the reliability of the power supply of the users. With the continuous development of my country's power distribution network, users have put forward higher requirements for power supply reliability and power supply quality: when a power distribution network fault occurs, the fault location can be quickly and accurately found, and the power supply in the non-faulty area can be restored. To reduce the power outage area and outage time, fault location is particularly important at this time. The rapid and accurate positioning of distribution line faults can not only repair the line as soon as possible to ensure reliable power supply, but also play a ver...

AI Technical Summary

Problems solved by technology

Since FI is generally configured in the trunk line section switch and the first section of the branch feeder, if a fault occurs on the trunk line such as F1, A and B will flow through the fault current, the corresponding indicators will act, and C, D, and E will not act, which can realize Locate the fault section; if the fault occurs on the branch line, such as F2, the indicators at A and C act, but the indicators at B, D, and E do not act, and it is impossible to correctly determine whether the fault occurred on the branch line where D or E is located. FI cannot accurately indicate the faulty section

[0005] Based on the above analysis, because of the multi-branch distribution network structure, the existing distribution network fault section location method cannot effectively locate the section where the fault is located. to the reliability of the power system

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