Power distribution network adaptive arc extinction method and system and storage medium

Abstract

The application discloses a power distribution network adaptive arc extinction method and system and a storage medium, and belongs to the field of power system protection, and comprises the following steps: obtaining the amplitude of a fault phase voltage after a single-phase grounding fault occurs; designing a monotonically changing membership function g(x) based on the amplitude of the fault phase voltage, wherein a characteristic quantity x of the membership function g(x) is a ratio of the amplitude of the fault phase voltage to a rated voltage amplitude during normal operation of the power distribution network; weighting reference signals U 0Iref and U 0Vref by taking the membership function g(x) and 1-g(x) as weights respectively, to obtain a total reference signal U 0ref ; wherein U 0Iref is an injected zero sequence current reference signal obtained by current arc extinction, and U 0Vref is an injected zero sequence voltage reference signal obtained by voltage arc extinction; and injecting the total reference signal U 0ref into a zero sequence control interface of a power distribution network converter to perform adaptive arc extinction. The application can improve the accuracy of arc extinction under various short-circuit working conditions of transition resistances.

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