MMC(modular multilevel converter)contains a large number of switching elements,which brings a huge computational burden to the electromagnetic transient simulation.For this problem,this paper proposes a rapid simulation method for full-bridge sub-module MMC based on bridge arm equivalent capacitance.A modeling method for arm equivalent circuit under normal working state,blocking state and full state was developed,and a simulation model was developed which can accurately simulate electromagnetic transient response of the full bridge MMC.On PSCAD/EMTDC platform,a two-terminal MMC-based DC grid test system was constructed to validate its feasibility.Additionally,the model was compared with the Thevenin equivalent model.The results confirm the accuracy and ef-ficiency of the proposed simulation.
关键词
直流电网/模块化多电平换流器/桥臂等效/电磁暂态
Key words
DC power grid/modular multilevel converter/bridge arm equivalence/electromagnetic transient
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