Simulation analysis of current protection in distributed power distribution network

Abstract

The massive access of distributed power sources makes the distribution network into an active network with bidirectional power flow, which increases the economics and flexibility of grid operation. However, the protection configuration of traditional distribution systems is based on a single power system. And distributed power has a certain randomness, and its fault current characteristics will change, which complicates the protection of distribution network with distributed power. In order to solve this problem, this paper first builds a distribution network with multiple distributed power sources based on the RTDS simulation platform, and simulates the fault current characteristics of the line faults. Then it sets up a three-stage current protection and supplies power based on the two-sided power supply The network calculates its setting value; finally analyzes the problems existing in the three-stage protection under the network and proposes the idea of using wide area protection as a backup protection.