Method and system for positioning faults in power distribution network section containing distributed power supply

Abstract

The invention discloses a method and system for positioning faults in a power distribution network section containing a distributed power supply. The method includes the following steps: establishing a power distribution network fault positioning model containing the distributed power supply; based on the power distribution network fault positioning model and each preset initialization parameters, using the preset binary system intelligent algorithm to calculate and generate an initial population; based on the global extreme and individual extreme of the initial population, updating flying speeds of particles; based on the updated flying speeds of the particles, updating the positions of the updated particles; using the binary system coding formula to conduct discretization on the updated particles to form a new generation of population; when the conditions of iteration termination are met, outputting positioning results; based on the influence of DG on fault current, dividing different regions, and looking for the fault critical points of the different regions. The report threshold value of fault current is set and the direction element of the fault current is installed so as to prevent fault report information from the influence by the DG. The method can rapidly and accurately determine the positions of faults, accelerates the recovery of power supply of the system, and increases system stability.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a fault location method and system for a section of a distribution network including a distributed power supply. Background technique [0002] The stability of the distribution network is the condition to maintain the normal operation of the system, and the failure of the distribution network is an important factor to reduce the stability. When a fault occurs in the network, fast and accurate judgment of the location of the fault is a prerequisite for restoring the normal operation of the distribution network. Therefore, an effective fault location method can improve the stability of the distribution network. [0003] With the continuous development and utilization of clean energy, people's awareness of environmental protection is increasing. Because Distributed Generation (DG) has the characteristics of cleanliness, environmental friendliness and low pollution, the power distributi...

AI Technical Summary

Problems solved by technology

Because Distributed Generation (DG) has the characteristics of cleanliness, environmental friendliness and low pollution, the power distribution system connected to DG is continuously researched and developed. DG includes photovoltaic power generation, fuel cells, wind power generation and small hydropower generation, etc., among which wind power Power generation and photovoltaic power generation have a large proportion of applications, but their output power is random, which brings safety hazards to the stable operation of the power distribution system

At the same time, the access of different nodes to the DG interferes with the fault judgment, making it impossible to accurately judge the fault location after the fault occurs, thereby extending the power outage time at the user end and ultimately reducing the reputation of the power supply system

The commonly used algorithm in the prior art is the matrix algorithm to judge the location of the fault, but the matrix algorithm is limited due to poor fault tolerance

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