Single-phase high-resistance line break fault identification method and device of power distribution network

Abstract

The invention discloses a single-phase high-resistance line break fault identification method and device of a power distribution network. A wide area measurement system is used to synchronously measure three phases of voltages in the downstream load side of a fault, the voltage amplitude of the fault phase in the load side is calculated and analyzed, and high-resistance single-phase line break fault identification is carried out on the basis of the voltage amplitude of the fault phase in the load side. Compared with a traditional identification method, a load-side equivalent circuit model under different grounding conditions and different grounding transitional resistances is analyzed and calculated, the fault identification method has a higher identification accuracy and wider applicationrange, and a feasible effective new scheme is provided for overcoming difficulty in single-phase high-resistance line break fault identification of the power distribution network.

Description

technical field [0001] The invention relates to a fault identification method for distribution network lines, and more specifically, to a method and device for fault identification of single-phase high-blocking line faults in a distribution network based on wide-area measurement. Background technique [0002] The distribution network is directly connected to users and is an important part of the power system. Its operating status is directly related to the quality of electricity consumption and personal safety of users. After a single-phase disconnection fault in the distribution network occurs, the three-phase voltage on the downstream load side of the fault is obviously unbalanced, which leads to the lack of phase operation of the three-phase power equipment such as the motor, and eventually burns out due to heat, causing serious economic losses; When a phase disconnection fault occurs, it is often accompanied by a ground fault. This kind of disconnection ground fault is d...

AI Technical Summary

Problems solved by technology

On the basis of WAMS, the present invention detects and analyzes the voltage of the downstream load side of the fault through a distributed measurement device, and uses this as a basis for fault identification of single-phase disconnection faults, so as to solve single-phase disconnection faults in the current distribution network Difficult to identify problems

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