Investigate on a Simplified Multi-Port Interline DC Power Flow Controller and Its Control Strategy

Wen Wu, Xuezhi Wu, Long Jing and Jingyuan Yin
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Wen Wu: National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
Xuezhi Wu: National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
Long Jing: National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
Jingyuan Yin: The Institute of Electrical Engineering Chinese Academy of Sciences, Beijing 100190, China

Energies, 2019, vol. 12, issue 13, 1-28

Abstract: A DC power flow controller (DCPFC) can help to facilitate power flow routing in the multi-terminal high-voltage direct current (HVDC) transmission system. Realizing its multi-port output can effectively improve the device regulate range and capability. Based on analysis of the traditional multi-port interline DC power flow controller (MI-DCPFC), this paper presents a switches reduced topology of MI-DCPFC. In addition, for solving the problem of coupling of the port-output voltage of the traditional MI-DCPFC, a novel control strategy based on carrier phase shifting pulse width modulation (CPS-PWM) is proposed. It implements the decoupling of the port-output voltage of MI-DCPFC, which can ensure completely independent tracking of the power flow regulating commands for different controlled lines. Moreover, key relationships between the system state variables are also analyzed and detailed in this study. Finally, the performance of the proposed controller and control strategy are confirmed with the simulation and experiment studies under different conditions.

Keywords: multi-terminal HVDC transmission system; DC power flow control; multi-port topology; decoupling; control strategy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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