Adaptive Reclosing and Fault Recovery Strategies for Large Scale Distributed Generation Access in Distribution Networks

High penetration distributed generation (DG) in power grids has placed greater demands on power supply recovery in distribution network fault scenarios. Research on fault recovery in distribution networks is essential for improving the reliability and stability of distribution systems. In order to enhance the recovery capability of the distribution network, this paper proposes a fault recovery scheme which combines reclosing technology with the low-voltage ride through (LVRT) characteristics of distributed power sources. As an important method for quickly restoring power supply, adaptive reclosing, when coordinated with the LVRT capability of DG in the time domain, can effectively reduce the disconnection rate of DG from the grid. In fault scenarios, flexible soft switches play an important role in load transfer and voltage support, which not only ensures continuous power supply to users but also enhances the utilization efficiency of renewable energy sources and reduces their disconnection rate. This paper proposes different fault recovery schemes for both sides of the fault location in the distribution network, and finally proves the effectiveness and feasibility of the proposed fault recovery scheme by developing a simulation model on the MATLAB/Simulink simulation platform.