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Title
Japanese: 
English:Experimental Verification of TSBC-Based Electrical Drives when the Motor Frequency is Passing Through, or Equal to, the Supply Frequency 
Author
Japanese: 川村 弥, 千葉 雄斗, 萩原 誠, 赤木 泰文.  
English: Wataru Kawamura, Yuto Chiba, Makoto Hagiwara, Hirofumi Akagi.  
Language English 
Journal/Book name
Japanese: 
English:IEEE 
Volume, Number, Page         pp. 5490-5497
Published date Sept. 20, 2015 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English:IEEE 7th Energy Conversion Congress and Expo (ECCE2015) 
Conference site
Japanese: 
English:Montreal, QC 
DOI https://doi.org/10.1109/ECCE.2015.7310432
Abstract This paper provides a theoretical and experimental discussion on an adjustable-speed motor drive using a modular multilevel cascade converter based on triple-star bridge cells (MMCC-TSBC) when the motor frequency is close and equal to the supply frequency. The TSBC is one of the most suitable candidates for medium-voltage, high-power motor drives with regenerative braking. However, it suffers from capacitor-voltage fluctuations that become larger as the motor frequency gets closer to the supply frequency. This paper presents a practical solution to overcome it with acceptable circulating currents. This solution makes it possible to achieve an adjustable-speed drive of a line-started motor loaded at the rated torque. Experimental waveforms show good start-up performance from a standstill to the rated speed, keeping each cluster current within an acceptable level.

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