A Full-bridge Director Switches based Multilevel Converter with DC Fault Blocking Capability and Its Predictive Control Strategy

Jin Zhu, Tongzhen Wei, Qunhai Huo and Jingyuan Yin
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Jin Zhu: Institute of Electrical Engineering, Chinese Academy of Sciences, Haidian District, Beijing 100190, China
Tongzhen Wei: Institute of Electrical Engineering, Chinese Academy of Sciences, Haidian District, Beijing 100190, China
Qunhai Huo: Institute of Electrical Engineering, Chinese Academy of Sciences, Haidian District, Beijing 100190, China
Jingyuan Yin: Institute of Electrical Engineering, Chinese Academy of Sciences, Haidian District, Beijing 100190, China

Energies, 2018, vol. 12, issue 1, 1-22

Abstract: Voltage source converter-based high-voltage direct current transmission system (VSC-HVDC) technology has been widely used. However, traditional half-bridge sub module (HBSM)-based module multilevel converter (MMC) cannot block a DC fault current. This paper proposes that a full-bridge director switches based multi-level converter can offer features such as DC side fault blocking capability and is more compact and lower cost than other existing MMC topologies. A suitable predictive control strategy is proposed to minimize the error of the output AC current and the capacitor voltage of the sub-module while the director switches are operated in low-frequency mode. The validity of the proposed topology and control method is demonstrated based on simulation and experimental studies.

Keywords: multilevel converter; DC side fault blocking; predictive control (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: 2018
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