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MMC circulating current suppression strategy based on complex resonance controller

Modular multilevel converters (MMC) have been widely used and studied in field of high-power electric energy conversion due to their good scalability and harmonic characteristics. During the operation of the MMC system, there will be circulation current problems, which will cause system loss and power switch tubes to heat or even burn. How to suppress the system circulation has become one of the key technologies to guarantee the stable operation of MMC. This paper proposes a strategy based on complex resonance control (CRC)to suppress system circulation current, use coordinate transformation to convert its component into the actual voltage vector, Circulation suppression is obtained by constructing a virtual two-phase stationary coordinate system to suppress them. The method is accompanied by submodule capacitance voltage equalization control. The validity of its control method is examined in the simulation software.