Decoupling and Phase Shift Control Method of Modular Interline DC Power Flow Controller

DC power flow controller (DCPFC) is regarded as an effective technology to improve the power distribution capability in a complex dc power grid. Among different types of DCPFCs, the interline dc power flow controller (IDCPFC) can realize multiline power flow control functions in a complex dc grid. In this paper, a modular interline dc power flow controller based on switch isolation (ISO-IDCPFC) and a decoupling and phase shift control method of ISO-IDCPFC are proposed. ISO-IDCPFC has the advantages of modularity, scalability and multi-level outputs. By utilizing the dual-target decoupling and multi-carrier phase shift control method, ISO-IDCPFC can realize flexible and economical line current adjustment. Based on these, simulation models built in PLECS and downscaled experiment setup are used to validate the effectiveness of the proposed topology and the control method.