Fault Recovery Strategy for Active Distribution Network Considering Repair Sequence Under Extreme Weather

Abstract

In recent years, power system blackouts caused by extreme weather have occurred more frequently. Based on the analysis of the characteristics of large scale failures of the distribution network in extreme weather, a fault recovery strategy considering repair sequence is proposed to improve the power supply capacity of the distribution network. A two-layer distribution network reconfiguration model considering both reliability and costs is established. Considering both the reliability and the economy, the loss load and the cost of distributed generation are minimized at the upper layer and the lower layer, respectively. Firstly, the statues of tie switches are adjusted after the network failure to construct the new radial network and obtain the topology based on the graph theory. Then the dynamic programming method is utilized to determine the optimal topology and the fault repair sequence. Taking the improved PG&E 69 node system as an example, the effectiveness and practicability of the proposed method for fault recovery under extreme disasters are verified.