Modular Interline DC Power Flow Controller
Zhong Xu, Miao Zhu, Yunwei Li, Shuai Wang, Han Wang, Xu Cai
Abstract
DC power flow controller (DCPFC) is regarded as an effective technology to improve the active power distribution capability in a complex dc 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 article, a modular multiline IDCPFC has been proposed via a transformerless structure. Specifically, the n-line IDCPFC can actively control (n-1)-line power flow based on the theoretical analysis. The proposed technology is analyzed in detail, including topology, operation principle, and control strategy. As a case study, a three-line IDCPFC is implemented in this article. Both simulation and experimental results are obtained to show that the proposed IDCPFC can effectively control multiline power flows under various conditions.