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Open AccessArticle

A Hybrid Nine-Arm High-Voltage Inverter with DC-Fault Blocking Capability

School of Electric Power, South China University of Technology, Guangzhou 510640, China
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Energies 2019, 12(20), 3850; https://doi.org/10.3390/en12203850
Received: 2 September 2019 / Revised: 7 October 2019 / Accepted: 8 October 2019 / Published: 11 October 2019
The nine-arm inverter integrates two modular multilevel converters (MMCs) into one compact inverter to diminish the number of power semiconductor devices. It can be used for dual-motor driving or connecting two AC power sources in a multi-terminal high voltage direct current (HVDC) system, etc. Although the half-bridge based modular multilevel converter has the fewest components, it is generally not resistant to the DC-side faults. In order to achieve a DC fault blocking capability with high efficiency and low cost, this paper proposes a hybrid nine-arm high-voltage inverter, which is consists of a full-bridge sub-module (FBSM) and a half-bridge sub-module (HBSM). Firstly, the topology, operation modes, and modulation strategy of the proposed hybrid inverter are presented. Then, by analyzing the potential short-circuit current paths between different ports, the ability of the proposed hybrid inverter to block the DC faults is described and the appropriate ratio of HBSM and FBSM is determined to further reduce the number of devices and the losses of the proposed hybrid inverter. Finally, simulation results based on MATLAB/Simulink are provided to demonstrate the effectiveness and feasibility of the proposed hybrid nine-arm high-voltage inverter under normal operation and DC fault condition. View Full-Text
Keywords: DC fault blocking; modular multilevel converter; half-bridge sub-module; full-bridge sub-module DC fault blocking; modular multilevel converter; half-bridge sub-module; full-bridge sub-module
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Jiao, L.; Qiu, D.; Zhang, B.; Chen, Y. A Hybrid Nine-Arm High-Voltage Inverter with DC-Fault Blocking Capability. Energies 2019, 12, 3850.

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