TY - JOUR
T1 - A Currentless submodule individual voltage balancing control for modular multilevel converters
AU - Deng, Fujin
AU - Liu, Chengkai
AU - Wang, Qingsong
AU - Zhu, Rongwu
AU - Cai, Xu
AU - Chen, Zhe
N1 - Funding Information:
Manuscript received April 26, 2019; revised July 6, 2019 and October 1, 2019; accepted October 24, 2019. Date of publication November 15, 2019; date of current version July 14, 2020.This work was supported in part by the National Natural Science Foundation of China under Project 61873062, in part by the Natural Science Foundation of Jiangsu Province under Project BK20180395, and in part by the Six Talent Peaks Project of Jiangsu Province under Project GDZB-002. (Corresponding author: Fujin Deng.) F. Deng is with the Jiangsu Key Laboratory of Smart Grid Technology and Equipment, and the School of Electrical Engineering, Southeast University, Nanjing 210096, China (e-mail: fdeng@seu.edu.cn).
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Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/11
Y1 - 2020/11
N2 - The capacitor voltage balancing is one of the most important issues for safe and reliable operation of the modular multilevel converters (MMC). This article proposes a currentless submodule individual voltage balancing control (SMIVBC) to realize capacitor voltage balancing in the MMC. Through regulating the dc component in each submodule (SM) capacitor current by modulation index m-based SMIVBC or phase angle θ-based SMIVBC, each SM capacitor voltage can be individually controlled to follow a reference value, which can realize capacitor voltage balancing in the MMC. The proposed SMIVBC not only requires no sorting technique to select the SMs in the MMC avoiding sorting algorithm, but also requires no knowledge of current in the MMC, which reduces the sensors and sampling signals, saves the cost, and improves the reliability. Simulation studies with professional tool power systems computer aided design for electromagnetic transients including DC (PSCAD/EMTDC) and experiment studies with a down-scale prototype in the laboratory are both conducted and their results confirm the effectiveness of the proposed SMIVBC for the MMC.
AB - The capacitor voltage balancing is one of the most important issues for safe and reliable operation of the modular multilevel converters (MMC). This article proposes a currentless submodule individual voltage balancing control (SMIVBC) to realize capacitor voltage balancing in the MMC. Through regulating the dc component in each submodule (SM) capacitor current by modulation index m-based SMIVBC or phase angle θ-based SMIVBC, each SM capacitor voltage can be individually controlled to follow a reference value, which can realize capacitor voltage balancing in the MMC. The proposed SMIVBC not only requires no sorting technique to select the SMs in the MMC avoiding sorting algorithm, but also requires no knowledge of current in the MMC, which reduces the sensors and sampling signals, saves the cost, and improves the reliability. Simulation studies with professional tool power systems computer aided design for electromagnetic transients including DC (PSCAD/EMTDC) and experiment studies with a down-scale prototype in the laboratory are both conducted and their results confirm the effectiveness of the proposed SMIVBC for the MMC.
KW - Capacitor voltage control
KW - currentless, individual control
KW - modular multilevel converters (MMC)
KW - submodule (SM)
UR - http://www.scopus.com/inward/record.url?scp=85090285592&partnerID=8YFLogxK
U2 - 10.1109/TIE.2019.2952808
DO - 10.1109/TIE.2019.2952808
M3 - Journal article
AN - SCOPUS:85090285592
SN - 0278-0046
VL - 67
SP - 9370
EP - 9382
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 11
M1 - 8901980
ER -