TY - GEN
T1 - An Improved Capacitor Voltage Balanced Method of Modular Multi-level Converter
AU - Chai, Xiaoli
AU - Huang, Jingjing
AU - Li, Geng
AU - Zhang, Aimin
AU - Zhang, Wei
AU - Zhang, Lei
N1 - Publisher Copyright:
© 2021 IEEE.
PY - 2021
Y1 - 2021
N2 - Modular Multi-level Converter (MMC) has been widely used in the field of flexible DC transmission due to its modularity, low switching loss, low harmonic distortion rate, etc. The balance of the sub-module capacitor voltage in MMC control system is critical and it is hardly guaranteed by the traditional Carrier Phase Shift Modulation (CPSM) scheme. Therefore, an improved capacitor voltage balanced scheme is proposed in this paper. By analyzing the composition of the sub-module (SM) DC capacitor voltage variation, it is found that the bridge arm current has a great influence on the voltage balance of SMs. Thus, the bridge arm current is employed in the CPSM scheme. This improved voltage balanced method can effectively increase the transient settling speed of the SM voltage balance without introducing extra switching loss and large calculation cost. The simulation results show that the proposed capacitor voltage balanced method can reduce the transient settling time by more than 75% when comparing with the traditional scheme, which verifies the effectiveness and superiority of proposed method.
AB - Modular Multi-level Converter (MMC) has been widely used in the field of flexible DC transmission due to its modularity, low switching loss, low harmonic distortion rate, etc. The balance of the sub-module capacitor voltage in MMC control system is critical and it is hardly guaranteed by the traditional Carrier Phase Shift Modulation (CPSM) scheme. Therefore, an improved capacitor voltage balanced scheme is proposed in this paper. By analyzing the composition of the sub-module (SM) DC capacitor voltage variation, it is found that the bridge arm current has a great influence on the voltage balance of SMs. Thus, the bridge arm current is employed in the CPSM scheme. This improved voltage balanced method can effectively increase the transient settling speed of the SM voltage balance without introducing extra switching loss and large calculation cost. The simulation results show that the proposed capacitor voltage balanced method can reduce the transient settling time by more than 75% when comparing with the traditional scheme, which verifies the effectiveness and superiority of proposed method.
KW - Capacitor Voltage balance Control
KW - Carrier Phase Shift Modulation (CPSM)
KW - Modular multilevel converter (MMC)
KW - Sub-module (SM)
UR - https://www.scopus.com/pages/publications/85125184927
U2 - 10.1109/CCDC52312.2021.9601766
DO - 10.1109/CCDC52312.2021.9601766
M3 - 会议稿件
AN - SCOPUS:85125184927
T3 - Proceedings of the 33rd Chinese Control and Decision Conference, CCDC 2021
SP - 7022
EP - 7026
BT - Proceedings of the 33rd Chinese Control and Decision Conference, CCDC 2021
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 33rd Chinese Control and Decision Conference, CCDC 2021
Y2 - 22 May 2021 through 24 May 2021
ER -