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Title
Japanese: 
English:A DC Fault Ride-Through Control of Half-Bridge MMCs for the HVDC Grid with DC Circuit Breakers 
Author
Japanese: 千葉 惇史, 佐野 憲一朗, Yushi Koyama, 関口 慧, 石黒 崇裕, Daichi Suzuki.  
English: Atsushi Chiba, Kenichiro Sano, Yushi Koyama, Kei Sekiguchi, Takahiro Ishiguro, Daichi Suzuki.  
Language English 
Journal/Book name
Japanese: 
English:International Power Electronics Conference (IPEC-Himeji ECCE Asia) 
Volume, Number, Page         pp. 2046-2051
Published date May 2022 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English:International Power Electronics Conference (IPEC-Himeji ECCE Asia) 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.23919/IPEC-Himeji2022-ECCE53331.2022.9807072
Abstract Operation delay of DC circuit breakers causes a voltage sag of several milliseconds in HVDC grids. The DC voltage sag may cause an overcurrent in the DC side of the modular multilevel converter (MMC), resulting in the halt of the MMC. This study investigates a method for enabling continuous operation of the half-bridge MMC during the DC voltage sag. The proposed method performs feedback control of the DC current during DC voltage sags by decreasing the DC and AC voltages of the half-bridge MMC. When the method is applied to symmetrical monopole HVDC systems, the MMC can maintain both its DC and AC currents within the rated range during the voltage sag caused by pole-to-ground faults. Simulation results obtained by a three-terminal HVDC grid verify the DC fault ride-through capability of the half-bridge MMC.

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