Coordinated Control Method for AC/DC Distribution Network Based on Four-port Energy Router

Abstract

With the large increase in DC load penetration rate of renewable energy and electric vehicles, the traditional AC distribution network has been unable to meet the requirements of load transfer and reliability, and the research on AC/DC distribution network has developed rapidly. This paper proposes a new coordinated control method for AC/DC distribution network, which aims to solve the coordination problem in various states of AC/DC distribution network. Based on the analysis of AC/DC distribution network characteristics, based on the characteristics of four-port energy router, an AC/DC distribution network model based on four-port energy router is established. Taking full advantage of the convenient operation and high reliability of the four-port energy router, the coordinated control method of the AC/DC distribution network in the normal working mode, operation mode switching and key equipment operation is proposed respectively, which can realize flexible access to the distribution network of renewable energy and DC load, comprehensively improve regional stability, and has high application value.