An Interline HVDC Power Flow Controller Based on Energy-Exchanging Arm

Meshed HVDC grid is instrumental in enhancing transmission capability and mitigating power fluctuations of renewable power generations. However, meshed dc grid cannot fully regulate the current flow through each line. To address the problem, this article presents a novel design for dc power flow controller (DCPFC) that enhances power flow control capability of meshed HVDC grid while minimizing the use of semiconductors. Benefits could be especially valuable in multiport applications. The circuit structure, operating waveforms, parameters, and control design are presented. The start process of the proposed DCPFC is also introduced. Simulation results and downscaled experimental tests are performed for demonstrating the effectiveness of the proposed topology.