Power distribution network single-phase earth fault arc extinguishing method, device and equipment and storage medium

Abstract

The invention discloses a power distribution network single-phase earth fault arc extinguishing method, device and equipment and a storage medium, and the method comprises the steps: determining a feeder line with a reduced phase voltage and an increased phase current from a power distribution network, and enabling the feeder line to serve as a fault feeder line with an earth fault; calculating the impedance value of a grounded impedance branch according to the load impedance of the fault feeder line, and setting an impedance branch; connecting the impedance branch to a bus where the fault feeder is located; detecting the zero-sequence current of the fault feeder line; and adjusting the impedance value of the impedance branch based on the zero-sequence current so as to reduce the zero-sequence current. The impedance value of the impedance branch is calculated by using the load impedance of the fault feeder line, so that the impedance branch can be matched with the fault feeder line, and when the impedance branch is connected to the bus where the fault feeder line is located, the fault current of the fault feeder line is eliminated to the maximum extent; and the impedance value of the impedance branch is adaptively adjusted according to the zero-sequence current of the fault feeder line, so that the fault current of the fault feeder line can be further reduced.

Description

technical field [0001] Embodiments of the present invention relate to arc suppression technology, and in particular to a single-phase ground fault arc suppression method, device, equipment and storage medium of a distribution network. Background technique [0002] The structure of the distribution network is complex and changeable, closely connected with users, and prone to random faults. About 70% of the faults are instantaneous single-phase ground faults. Serious single-phase ground faults may damage the stability of the regional power grid system and cause greater ACCIDENT. Therefore, the current suppression technology of ground fault is an important and difficult problem in the research of distribution network. [0003] In order to limit the ground fault current, the distribution network generally adopts the grounding method of the neutral point through the arc suppressing coil, and suppresses the ground fault current by compensating the capacitive current in the ground...

AI Technical Summary

Problems solved by technology

However, with the increase of the cable network and a large number of non-linear loads and power electronic equipment, the fault current contains a large number of active components and harmonic components, while the traditional arc suppression coil can only compensate the reactive component of the fault current. It cannot compensate its active component (about 2% to 8%) and harmonic component (about 5%), and the ground fault current of part of the distribution network is still as high as tens of amperes after the arc suppression coil compensates the capacitance component, which is enough to maintain the arc burning

[0004]The arc suppression technology of the distribution network in the prior art cannot meet the arc suppression of the existing single-phase ground fault in the distribution network

When a single-phase ground fault occurs in the distribution network, the fault current cannot be reduced to a certain range or completely eliminated, and it cannot effectively completely extinguish the fault arc.

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