Research in system design of AC and DC distribution network based on flexible substation

Abstract In recent years, distribution network is developing rapidly from current to future advanced form. Under the tendency, this article puts forward a new AC and DC distribution network technology based on flexible substation. There is no mature design experience and complete theory for designing, equipment manufacturing and engineering construction, etc. in this technology. In this paper, system design method of AC and DC distribution network based on flexible substation are given systematically. And design of overall system, key equipment parameters, control and protection are researched and discussed. All of the research results above are adopted in the first AC and DC distribution network demonstration project based on flexible substation. The paper will provide theoretical and experimental experience for system design in the future AC and DC distribution network projects.