An Expandable Interline DC Power Flow Controller

The power flow control capability of high-voltage dc power grid can be improved by integrating a dc power flow controller into the grid. In this article, an expandable interline dc power flow controller (IDCPFC) is proposed. Compared with the existing dc power flow controller, the proposed IDCPFC has the advantages of high expandability, less active switching devices, simpler control, and wider adjustment range. A three-port IDCPFC is selected as the case study and the performance of IDCPFC is verified through simulation and experiment. Experimental results show that the proposed IDCPFC can achieve multiline power flow control under various conditions.