Optimized modulation method for the modular multilevel converter with redundant sub-modules under arm-asymmetric operating conditions

Considering the synthetical effects of redundant submodules and arm-asymmetric operating conditions within the modular multilevel converter (MMC), a modified mathematical model is established in this paper, and the modified switching function and the mechanism of circulating current are analyzed. On...

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Bibliographic Details
Published in2016 IEEE Power and Energy Society General Meeting (PESGM) pp. 1 - 5
Main Authors Gaoren Liu, Yuzhi Zhou, Huangqing Xiao, Zheng Xu
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2016
Subjects
arm-asymmetric operation
circulating current
Control systems
Indexes
Integrated circuit modeling
modular multilevel converter (MMC)
Modulation
Reactive power
redundancy protection
Safety
Voltage control
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Summary:Considering the synthetical effects of redundant submodules and arm-asymmetric operating conditions within the modular multilevel converter (MMC), a modified mathematical model is established in this paper, and the modified switching function and the mechanism of circulating current are analyzed. On this basis, an optimized modulation strategy is proposed to minimize the fundamental component of the inner circulating current. Unlike previous strategies, the sub-modules in healthy arms need not be bypassed when SM faults occur and the degree of asymmetry will be reduced. In the proposed strategy, the system can operate well under arm-asymmetric conditions and the redundant sub-modules can be fully utilized. A model of two-terminal MMC-HVDC system is built in PSCAD/EMTDC, and the simulation result proves the validity and the feasibility of the proposed strategy.
ISSN:1944-9933
DOI:10.1109/PESGM.2016.7741128