Single-phase ground fault positioning method of active power distribution network, device and system

Abstract

The invention discloses a single-phase ground fault positioning method of an active power distribution network. The method comprises the steps of acquiring the respective zero-sequence current sequence of two preset points on the active power distribution network; determining whether the current waveforms which correspond with the two zero-sequence current sequences satisfy a preset condition; ifyes, determining existence of a single-phase ground fault between the two preset points; and otherwise, determining no single-phase ground fault between the two preset points. According to the method,because a distributed power supply does not affect the zero-sequence current of the active power distribution network, relatively high accuracy is realized in determining whether the single-phase ground fault between the two preset points through determining whether the current waveform of the zero-sequence current sequence satisfies the preset condition; personnel can quickly find the single-phase ground fault position and performs in-time processing, thereby reducing influence to normal power use of a user, and eliminating a potential safety hazard. The invention further discloses a single-phase ground fault positioning device of the active power distribution network, and a system, wherein the single-phase ground fault positioning device and the system have the beneficial effect which is same with that of the single-phase ground fault positioning method.

Description

technical field [0001] The invention relates to the field of active distribution networks, in particular to a single-phase ground fault location method for an active distribution network, and also relates to a single-phase ground fault location device and system for an active distribution network. Background technique [0002] At present, the domestic active distribution network is vigorously developing DG (Distributed Generation) distributed power, but after the distributed power is connected to the distribution network, the radial active distribution network becomes a multi-power network with small and medium-sized power sources, giving The location of single-phase ground faults has a serious impact. Many fault location methods suitable for traditional distribution networks cannot meet the fault location requirements of active distribution networks. Facing active distribution networks with distributed power sources, there is no such method in the prior art. A mature method...

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Problems solved by technology

[0002] At present, the domestic active distribution network is vigorously developing DG (Distributed Generation) distributed power, but after the distributed power is connected to the distribution network, the radial active distribution network becomes a multi-power network with small and medium-sized power sources, giving The location of single-phase ground faults has a serious impact. Many fault location methods suitable for traditional distribution networks cannot meet the fault location requirements of active distribution networks. Facing active distribution networks with distributed power sources, there is no such method in the prior art. A mature method for locating single-phase ground faults cannot achieve precise positioning of single-phase ground faults, and cannot quickly eliminate single-phase ground faults, which affects the normal power consumption of users and may burn out related equipment, posing safety hazards

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