New Relay Protection Method for Active Distribution Network

With the deterioration of the global climate environment and the intensification of the energy crisis, new energy sources such as photovoltaics and wind power are widely integrated into the distribution network in the form of distributed power sources, transforming the traditional passive network into a complex network with multiple power sources simultaneously supplying power. The electrical characteristics such as power flow distribution and short-circuit characteristics of the distribution network have undergone significant changes, which have had a huge impact on traditional relay protection methods. It is urgent to study new relay protection methods for active distribution networks under high proportion of new energy integration. This article proposes a protection method based on positive sequence current. A simulation model was built in PSCAD/EMTDC, and the reliability of the method was verified through simulation.