Power distribution network adaptive differential protection self-healing method based on wireless communication

Abstract

The invention discloses a power distribution network adaptive differential protection self-healing method based on wireless communication, which is characterized by comprising the steps that 1, based on an intelligent distributed platform connected with a wireless communication system, one of a plurality of intelligent distributed terminal DTUs receives and synchronizes differential protection data from other DTUs based on a sampling point interpolation synchronization method and an IRIG global time synchronization method, and then the differential current in the intelligent distributed platform is detected; 2, overcurrent switches in the platform are sequentially detected based on the differential current, and after an overcurrent circuit breaker is detected, tripping operation is executed on the overcurrent circuit breaker to realize fault isolation; and 3, after fault isolation is completed, a downstream switch of the fault point transmits remote signaling to the downstream side, and an optimal load transfer scheme is selected based on interconnection switch data and a self-healing strategy. According to the scheme, monitoring control of the operation state of the power distribution network and rapid positioning, isolation and recovery of power distribution network faults can be achieved, the reliability is high, and the cost is low.

Description

technical field [0001] The invention relates to the field of power distribution in electric power systems, and more specifically, to a self-healing method for self-adaptive differential protection of a distribution network based on wireless communication. Background technique [0002] At present, as a large number of distributed power sources are connected to the distribution network, the fault current level and flow direction of the distribution network have undergone major changes. The traditional three-stage overcurrent protection has been difficult to meet the index requirements of distribution network protection. The line current differential protection has fast action speed and high reliability, and can accurately locate and quickly remove faults in the distribution network. [0003] However, due to the high cost of optical fiber laying in urban areas and the lack of optical fiber coverage at distribution network points, it is difficult to realize the optical fiber di...

AI Technical Summary

Problems solved by technology

[0003]However, due to the high cost of optical fiber laying in urban areas and the lack of optical fiber coverage at distribution network points, it is difficult to implement optical fiber differential protection solutions, and the implementation cost is high, more difficult

Although there are technical solutions for using wireless communication systems to realize differential protection in the prior art, the existing solutions have low reliability, heavy workload, prone to communication anomalies, slow self-healing recovery time, and difficult time synchronization between devices. ensure

Images