The topology research of series-parallel multi-function composite controller for DC power distribution network

In recent years, inspired by the idea from FACTS in ac system, scholars put forward the concept of DC FACTS, and the research and application of DC FACTS equipment for DC distributed network is discussed, such as the DC voltage compensator, DC power flow controller, DC fault current limiter and so on. In order to further improve the cost performance of DC FACTS device, drawing on the research results of AC FACTS multiplex, this paper aims at exploring a new structure for series-parallel multi-function composite controller in dc grid which contains multi-function in power flow control, voltage compensation and fault current limiting. The working principle of series-parallel multi-function composite controller is proposed and the main circuit parameter design method is described. The simulation model is built to show the feasibility of the proposed topology.