极端冰雪天气下计及故障演化的有源配电网故障恢复方法OA

The mechanism of fault evolution in distribution networks under extreme ice and snow weather is not accurately characterized.Additionally,existing fault restoration methods in distribution network cannot effectively represent the control methods of distributed power sources.This paper proposes a fault restoration method for active distribution networks considering fault evolution under extreme ice and snow weather.Firstly,this paper clarifies the impact of distribution line faults and uncertainty in distribution network power flow under extreme ice and snow weather.The probability of distribution line faults and the probability of system state transitions are quantified.A cascading fault evolution model for distribution network based on probabilistic power flow is constructed.Secondly,based on the region partitioning concept of point-based localization,the hierarchical relationships among master control nodes,subordinate control nodes,and load nodes within islanded regions are comprehensively considered.By integrating the master-slave control logic of islanded operation,a fault restoration model of distribution network is proposed,incorporating the coordination of network reconfiguration and island partition.Finally,the effectiveness of the proposed strategy is verified using the PG&E 69-bus distribution system and a certain 185-bus actual distribution system.