TY - GEN
T1 - Impact of the circulating current control on transient submodule voltage stresses for grid-tied modular multilevel converters during grid faults
AU - Yin, Zhijian
AU - Qiu, Huan
AU - Yang, Yongheng
AU - Tang, Yi
AU - Wang, Huai
PY - 2019/9
Y1 - 2019/9
N2 - The maximum sub-module (SM) voltage stress is a key parameter for the modular multilevel converter (MMC) design, e.g., IGBT voltage rating selection and SM capacitor sizing. For a grid-tied MMC, the evaluation of the SM voltage stress should consider the steady-state operation and also the dynamic performances, which are significantly dependent on the MMC control system. Thus, this paper proposes a mathematical approach based on a typical MMC control strategy to investigate the interaction between the SM voltage and the circulating current suppression control. The time domain expression of the transient SM voltage during grid faults is derived. To verify the model, a downscale three-phase MMC experimental platform has been built. Comparisons of the model estimation of the SM voltage dynamics and experimental results verify the effectiveness of the proposed model.
AB - The maximum sub-module (SM) voltage stress is a key parameter for the modular multilevel converter (MMC) design, e.g., IGBT voltage rating selection and SM capacitor sizing. For a grid-tied MMC, the evaluation of the SM voltage stress should consider the steady-state operation and also the dynamic performances, which are significantly dependent on the MMC control system. Thus, this paper proposes a mathematical approach based on a typical MMC control strategy to investigate the interaction between the SM voltage and the circulating current suppression control. The time domain expression of the transient SM voltage during grid faults is derived. To verify the model, a downscale three-phase MMC experimental platform has been built. Comparisons of the model estimation of the SM voltage dynamics and experimental results verify the effectiveness of the proposed model.
KW - Circulating current control
KW - Grid faults
KW - Modular multilevel converter
KW - Sub-module voltage stress
UR - http://www.scopus.com/inward/record.url?scp=85076790513&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2019.8912833
DO - 10.1109/ECCE.2019.8912833
M3 - Article in proceeding
T3 - IEEE Energy Conversion Congress and Exposition
SP - 5908
EP - 5913
BT - Proceedings of 2019 IEEE Energy Conversion Congress and Exposition (ECCE)
PB - IEEE Press
T2 - 2019 IEEE Energy Conversion Congress and Exposition (ECCE)
Y2 - 29 September 2019 through 3 October 2019
ER -