Abstract：Modular multilevel converter (MMC) is a possible solution for integrating an EV fleet into smart grid. However, due to the particularity of the electric vehicle energy storage system, if the main parameters of the power stage of MMC, such as the AC-DC voltage level and the cascaded module number of each arm and alike, are improperly designed, it may result in unreasonable insulation design and arm current beyond limitation, which will affect the security and efficient operation of the system in practice. To address the issue, based on the proposed multi-objective power management strategy for the MMC-based EV fleet integration system (MMC-EVIS), the optimal design criteria for system modulation, maximum arm current and charging/discharging power impact coefficient are established, and the security region for optimize configuration of main parameters is proposed. Taking a medium-sized MMC-EVIS as the scenario, an MMC-EVIS of 480kW is designed. Simulation under Matlab/Simulink is performed to indicate that the optimization of system is reasonable and necessary, which provides a reference for the design and operation analysis of the MMC-EVIS.
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2018, Vol. 33 
