Abstract
Modular multilevel converters (MMCs) has been considered as one of the next-generation converter in high voltage and power motor drive applications because of its flexible design, reliability, motor-friendliness. However, it has a large submodule (SM) capacitor voltage ripple at low motor speed. Recently, a hybrid modular multilevel converter (HMMC), adding a series switch at the dc-link, is proposed. It has been verified to be able to significantly reduce SM capacitor voltage ripple at low motor speed. The existing research only analyzes the HMMC operation for constant torque load, but in practice, the more widely used is quadratic-torque load such as fan- or pump-like load. This paper analyzes the SM capacitor voltage ripple of quadratic-torque loads considering the startup torque and introduces a method for dimensioning the SM capacitance. The correctness of the analysis and the feasibility of the method are proved by the simulation results.
Published Version
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