Power distribution network grounding self-adaptive control system and method

Abstract

On the basis of an original system, a bus PT, a self-adaptive control parallel loop, a self-adaptive control module and the like are added for a power distribution network grounding self-adaptive control system. Optimization and adjustment on switching and a resistance value of a switch are achieved under the system support by adopting a self-adaptive control method and through the self-adaptive control module. The method further provides a self-adaptive control optimization strategy for adjustment of an arc extinction coil and a variable-resistance gear. The power distribution network grounding self-adaptive control system improves the accuracy of fault line tripping, effectively reduces control and adjustment errors during a next fault, effectively prevents grounding fault signals from being mistakenly send and remarkably improves the line selection accuracy in a single-phase grounding mode.

Description

technical field [0001] The invention relates to a grounding system of a distribution network neutral point, in particular to a distribution network grounding adaptive control system and an adaptive control method. Background technique [0002] The grounding method of the neutral point of the power grid is closely related to the reliability, safety and economy of the power system operation. With the construction and development of the smart grid, the selection of the neutral point grounding method for the urban power grid and distribution network has become the current smart grid. The key issues of modernization transformation and construction. In the current medium-voltage distribution network, the grounding methods of the neutral point mainly include three methods: non-grounding, arc-suppression coil grounding and small resistance grounding. The following three methods are briefly analyzed: [0003] 1) Ungrounded way [0004] In this mode, the equivalent capacitance of th...

AI Technical Summary

Problems solved by technology

Under this kind of grounding method, the isolation efficiency for permanent line faults (especially cable line faults) is low, and it is easy to cause long-term overvoltage operation of equipment, and it is difficult to guarantee the reliability of human judgment operation, which affects equipment and personal safety.

If the neutral point is grounded through a small resistance, when a single-phase ground fault occurs on the line, the large current signal generated can effectively realize the accurate action of the circuit breaker protection

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