Optimization research on relay protection of distribution network with distributed photovoltaics

The safety of the distribution network is of utmost importance. Although the integration of distributed generation can affect relay protection strategies, optimization can fully leverage its advantages. Distributed generation alters the power flow distribution in the network, impacting the settings of protection devices during short-circuit faults. Therefore, relay protection strategies need optimization. This paper proposes two solutions: first, analyzing from the perspective of relay protection strategies, adjusting the settings and operation modes of protection devices; second, optimizing the protection devices themselves by configuring more reliable equipment. Simulation validates the effectiveness of the optimized strategy, demonstrating successful fault isolation without expanding the outage area. The optimized protection strategy significantly enhances the safety and reliability of the distribution network.