Dual-closed-loop control-based active voltage arc extinction method and apparatus for power distribution network in fault

Abstract

The invention discloses a dual-closed-loop control-based active voltage arc extinction method and apparatus for a power distribution network in fault. The arc extinction method comprises the following steps of collecting a three-phase voltage and a neutral point voltage of the power distribution network, and judging whether the power distribution network suffers from a single phase grounding fault or not; if the power distribution network suffers from the single phase grounding fault, determining a fault phase according to the value of the three-phase voltage; injecting an initial current to the power distribution network to obtain a phase voltage and a neutral point voltage of the fault phase, and determining an optimal injection current through a dual-closed-loop control method; and injecting the optimal injection current to the power distribution network to realize arc extinction on an instantaneous single phase grounding fault. According to the method and the apparatus disclosed by the embodiments, based on the dual-closed-loop control method, a current is injected to the neutral point of the active arc extinction apparatus when the power distribution network suffers from the single phase grounding fault; and the fault phase voltage is controlled to be zero, and the reactive current component, the active current component and the harmonic component of the fault phase are compensated, so as to realize rapid and high-precision complete arc extinction on the instantaneous single phase grounding fault.

Description

technical field [0001] The invention relates to the technical field of arc suppression for distribution network faults, in particular to a method and device for active voltage arc suppression for distribution network faults based on double closed-loop control. Background technique [0002] The transmission and distribution lines in the power system of the distribution network are very complex, and single-phase ground faults are prone to occur between the transmission and distribution lines. Among them, the most common is the instantaneous ground fault, which seriously affects the safe and stable operation of the distribution network. my country's distribution network generally adopts neutral point non-grounding methods, such as neutral point grounding, arc suppression coil grounding, resistance grounding, resistance and capacitance grounding, and other neutral point ineffective grounding methods. With the development of the distribution network, when a ground fault occurs on...

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Problems solved by technology

[0005] The present invention provides an active voltage arc suppression method and device based on double closed-loop control to solve the problem that the existing current arc suppression method can only compensate the reactive current at the fault point, but cannot compensate the active current, so that the current The problem that the arc suppression effect has limitations

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