A Reliability Assessment Method for Flexible Distribution Networks Considering Fault Restoration Process

Abstract

With the widespread integration of distributed generation and new types of loads, traditional distribution networks are gradually transitioning toward flexible interconnected distribution systems. The fast load transfer capability and voltage support capability of flexible devices provide new pathways for enhancing power supply reliability. This paper proposes a reliability assessment method for flexible interconnected distribution networks that accounts for the fault restoration process. First, a virtual fault flow modeling method incorporating integrated terminals is proposed. Then, a mixed-integer linear programming (MILP) model is constructed, which aims to minimize the system average interruption duration index and encompasses the multi-stage network reconfiguration process involving circuit breakers, switches, and flexible devices. Finally, the effectiveness of the proposed model is validated through a case study on a 103-node actual distribution network.