Operation Control Method of Relay Protection in Flexible DC Distribution Network Compatible with Distributed Power Supply

Abstract

A novel operation control method for relay protection in flexible DC distribution networks with distributed power supply is proposed to address the issue of inaccurate fault location during relay protection, leading to poor performance. The method combines a fault-tolerant fault location method based on long-term and short-term memory networks to accurately locate the fault section. Then, an operation control method for relay protection based on adaptive weight and whale optimization algorithm (WOA) is used to construct an objective function considering the shortest relay protection action time and the smallest impulse current. The adaptive weight and WOA are employed to obtain the optimal strategy for relay protection operation control, reducing the action time and impulse current. Experimental results demonstrate the effectiveness of the proposed method in accurately locating faults and improving relay protection performance. The longest operation time is reduced by 4.7023 s, and the maximum impulse current is limited to 0.3 A, effectively controlling the impact of large impulse currents and enhancing control efficiency.