Topology and Control of Modular Multilevel Converter Based Energy Storage Power Conversion System

In the new power system with a high proportion of new energy access and a high proportion of power electronic equipment access, the problems of system strength reduction and stability reduction are more prominent. This paper proposes a topology and control of modular multilevel converter based energy storage power conversion system. Based on the modular structure characteristics of modular multilevel converter, the battery energy storage is dispersed in its sub-modules to form a modular multilevel converter energy storage power conversion system (MMC-ESS), which plays a stable role in the grid-connection stability of the system through the energy storage unit. At the same time, the virtual synchronous generator (VSG) is used to replace the synchronous machine to support the power grid and maintain the stability of the power system. Eventually, simulation results were conducted to verify the efficacy of the proposed design scheme.