TY - GEN
T1 - Energy-based circulating current control of a single-phase hybrid modular multilevel converter
AU - Wang, Hongmei
AU - Chen, Fa
AU - Qu, Liyan
AU - Qiao, Wei
N1 - Funding Information:
This work was supported in part by the Nebraska Public Power District through the Nebraska Center for Energy Sciences Research and in part by the U.S. National Science Foundation under CAREER Award ECCS-1554497.
Publisher Copyright:
© 2021 IEEE.
PY - 2021/6/14
Y1 - 2021/6/14
N2 - This paper presents a mathematical model for the single-phase hybrid modular multilevel converter (MMC). Based on the model, the DC and fundamental AC components of the circulating current of the single-phase hybrid MMC are analyzed and their expressions are derived for the first time. Based on the analysis, a novel dual-loop circulating current control scheme is proposed for the single-phase hybrid MMC. The proposed control scheme can suppress the low-order harmonics of the circulating current without affecting the output current. Consequently, the total harmonic distortions and peak/root-mean-square values of the arm currents, the current/voltage stresses on the submodules (SMs), and the power loss of the MMC are all reduced. Moreover, the proposed control scheme can effectively balance the energy between the upper and lower arms of the single-phase hybrid MMC. Experimental results on a prototype of the single-phase hybrid MMC with three SMs per arm are provided to validate the effectiveness of the proposed circulating current control scheme.
AB - This paper presents a mathematical model for the single-phase hybrid modular multilevel converter (MMC). Based on the model, the DC and fundamental AC components of the circulating current of the single-phase hybrid MMC are analyzed and their expressions are derived for the first time. Based on the analysis, a novel dual-loop circulating current control scheme is proposed for the single-phase hybrid MMC. The proposed control scheme can suppress the low-order harmonics of the circulating current without affecting the output current. Consequently, the total harmonic distortions and peak/root-mean-square values of the arm currents, the current/voltage stresses on the submodules (SMs), and the power loss of the MMC are all reduced. Moreover, the proposed control scheme can effectively balance the energy between the upper and lower arms of the single-phase hybrid MMC. Experimental results on a prototype of the single-phase hybrid MMC with three SMs per arm are provided to validate the effectiveness of the proposed circulating current control scheme.
KW - Circulating current control
KW - Hybrid converter
KW - Modular multilevel converter (MMC)
KW - Single phase
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U2 - 10.1109/APEC42165.2021.9487461
DO - 10.1109/APEC42165.2021.9487461
M3 - Conference contribution
AN - SCOPUS:85115672909
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 913
EP - 920
BT - 2021 IEEE Applied Power Electronics Conference and Exposition, APEC 2021
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021
Y2 - 14 June 2021 through 17 June 2021
ER -