The Impact of Voltage-Balancing Control on Switching Frequency of the Modular Multilevel Converter


Voltage-balancing control during a modular multilevel converter (MMC) impacts not solely the voltage distinction among submodule capacitors, however conjointly the facility device switching patterns. Therefore, MMC possesses a nondeterministic switching pattern and its switching frequency is no longer an freelance parameter. This paper theoretically investigates how voltage-balancing management influences the switching frequency in the MMC. Equations describing the relationship between the submodule capacitor unbalanced voltage and converter switching frequency are derived. Since unbalanced voltage also impacts the submodule capacitor ripple voltage and voltage/current harmonics, the design interaction between switching frequency and submodule capacitance, furthermore the choice of unbalanced voltage are any investigated. Both simulation and experimental verifications are provided.

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