TY - GEN
T1 - A four-level modular multilevel converter with self voltage balancing and extremely small DC capacitor
AU - Liu, Yunting
AU - Peng, Fang Zheng
N1 - Publisher Copyright:
© 2019 IEEE.
PY - 2019/5/24
Y1 - 2019/5/24
N2 - The modular feature of modular multilevel converter (MMC) makes it stand out for medium/high voltage applications. However, as the number of sub-modules increases, the control complexity of voltage balance of each sub-module sharply increases. Conventionally, the MMC sub-module voltage cannot be balanced without voltage monitoring and control. This paper mathematically proofs that four-level MMC has the merit of self voltage balancing by nature. This merit eliminates the voltage monitoring and control for MMC. The four-level MMC simulations are provided for verification purpose. In addition, since the sub-module capacitor voltage tends to converge to nominal value, the low frequency voltage ripple is greatly reduced, which allows the sub-module capacitance to be extremely small. The proposed four-level MMC is 1/8 -1/6 the capacitance compared to conventional MMCs.
AB - The modular feature of modular multilevel converter (MMC) makes it stand out for medium/high voltage applications. However, as the number of sub-modules increases, the control complexity of voltage balance of each sub-module sharply increases. Conventionally, the MMC sub-module voltage cannot be balanced without voltage monitoring and control. This paper mathematically proofs that four-level MMC has the merit of self voltage balancing by nature. This merit eliminates the voltage monitoring and control for MMC. The four-level MMC simulations are provided for verification purpose. In addition, since the sub-module capacitor voltage tends to converge to nominal value, the low frequency voltage ripple is greatly reduced, which allows the sub-module capacitance to be extremely small. The proposed four-level MMC is 1/8 -1/6 the capacitance compared to conventional MMCs.
UR - https://www.scopus.com/pages/publications/85067093858
UR - https://www.scopus.com/pages/publications/85067093858#tab=citedBy
U2 - 10.1109/APEC.2019.8722162
DO - 10.1109/APEC.2019.8722162
M3 - Conference contribution
AN - SCOPUS:85067093858
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 2865
EP - 2871
BT - 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
Y2 - 17 March 2019 through 21 March 2019
ER -