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This paper presents a grid-connected bi-directional modular multilevel converter (MMC) with division-summation (D-Σ) digital control to achieve power injection and rectification functions. The D-Σ digital control is adopted to track current reference, regulate dc-bus voltage and cell voltage, and balance the upper and lower dc-bus voltages. It can accommodate wide filter inductance variation and take...
This study investigates the cell voltages and arm currents in double-star modular multilevel converters (DSMMCs) based on power balance and current tracking control law. DSMMCs have been widely applied to static synchronous compensators, high-voltage direct-current transmission, back-to-back power transfer systems, wind/solar power generation and battery storage systems. The size of capacitors in...
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