Capacitance Reduction Method on Hybrid MMC Topology with High Modulation Ratio

Qiang Fan; Jianzhong Xu; Tian Liang; Venkata Dinavahi; Chengyong Zhao

doi:10.17775/CSEEJPES.2022.07180

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Capacitance Reduction Method on Hybrid MMC Topology with High Modulation Ratio

Regular Papers | 更新时间：2026-03-25

- Capacitance Reduction Method on Hybrid MMC Topology with High Modulation Ratio
- CSEE Journal of Power and Energy Systems Vol. 12, Issue 1, Pages: 306-315(2026)
- 作者机构：
  
  1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University,Beijing,China
  2. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta,Canada
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2022.07180
  CLC：
- Published：2026
- 稿件说明：
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Qiang Fan, Jianzhong Xu, Tian Liang, et al. Capacitance Reduction Method on Hybrid MMC Topology with High Modulation Ratio[J]. CSEE Journal of Power and Energy Systems, 2026, 12(1): 306-315.
DOI：

Qiang Fan, Jianzhong Xu, Tian Liang, et al. Capacitance Reduction Method on Hybrid MMC Topology with High Modulation Ratio[J]. CSEE Journal of Power and Energy Systems, 2026, 12(1): 306-315. DOI： 10.17775/CSEEJPES.2022.07180.

摘要

Abstract

Hybrid MMC (Hy-MMC) has broad application prospects because of the negative level output ability in its bridge arm. A Hy-MMC topology with a high-modulation ratio is designed in this paper. A second-harmonic current injection (SHCI) strategy based on Hy-MMC in high-modulation operation is also proposed to improve the power density of Hy-MMC effectively in steady-state operation. The amplitude of SHCI is determined from the perspective of the root mean square (RMS) value of bridge arm current

and the optimal initial phase angle is determined from the multi-objective optimization (capacitor voltage ripple of sub-modules (SMs)

power loss

and peak value of bridge arm current). The effectiveness and engineering practicability of the proposed SHCI strategy based on Hy-MMC in high-modulation operation is verified by the electromagnetic transient (EMT) simulation using PSCAD/EMTDC@. The simulation results show that the capacitor voltage ripple of SMs can be effectively decreased by 61.98% or the capacitance can be decreased by 40%. The power loss is also analyzed. In addition

little influence of low capacitance on multi-operation conditions of Hy-MMC is verified by EMT simulation.

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