Method for positioning regional DC ground potential fluctuation source

Abstract

The invention relates to the technical field of power transmission and transformation, and discloses a method for positioning a regional DC ground potential fluctuation source. The method comprises the steps of building a substation grounding neutral point direct current monitoring network, acquiring the size and direction of direct current at a grounding neural point, developing direct current distribution calculation software by taking substation direct current monitoring data under a direct current transmission ground-return operation mode in the monitoring network as a basis, deducing direct current distribution at the substation grounding neural point through the direct current distribution calculation software, and comparing the direct current distribution with the size and direction, which are acquired by the monitoring network, of the direct current at the grounding neural point to obtain the position and current size of the fluctuation source. According to the method for positioning the regional DC ground potential fluctuation source, the ground potential fluctuation source is accurately positioned by using the existing regional AC power grid substation system, detection sites are not required to be additionally detected, and the detection cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation, in particular to a method for locating a regional DC ground potential fluctuation source. Background technique [0002] A number of recent studies have found that activities such as magnetic storms, high-altitude nuclear explosions, urban rail transit, and single-pole operation of DC transmission systems will cause significant fluctuations in the surface potential of a wide range, thereby generating DC at the neutral point of transformers operating in the grounded power system. current or a very low frequency current similar to direct current. This current not only endangers the safe operation of the AC power grid, but also has many adverse effects on underground metal pipelines and industrial electrical equipment. False alarms from the monitoring network will also produce a series of chain reactions, causing major safety accidents and economic losses, and bringing ...

AI Technical Summary

Problems solved by technology

This current not only endangers the safe operation of the AC power grid, but also has many adverse effects on underground metal pipelines and industrial electrical equipment. False alarms from the monitoring network will also produce a series of chain reactions, causing major safety accidents and economic losses, and bringing huge negative impacts to modern society

[0003] Due to its wide geographical distribution and low-resistance network characteristics, the transmission network can generate characteristic current distribution in the power system due to ground potential fluctuations, so the transmission network is a monitoring network that can detect ground potential fluctuations well. A large number of studies have been carried out on the characteristic current distribution in the AC system under the ground return operation mode, but these studies belong to the research of positive thinking, that is, the fluctuation of the ground potential is calculated when the fluctuation source is known, so as to calculate the DC current in the power system. current distribution, and cannot locate the source of ground potential fluctuations

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