Novel Control Strategy for Modular Multilevel Converter based Variable Speed PMSM Drive

Abstract

This paper introduces a control conspire for the modular multilevel converter (MMC) to drive a variable-speed ac machine, particularly concentrating on enhancing dynamic execution. Hypothetically, the energy balance in the MMC cell capacitors is prone to be unstable at start-up and low-frequency operations. Also, the MMC topology basically requires propelled control procedures to balance energy and mitigate the voltage pulsation of every cell capacitor. This paper proposed a control system for the vigorous dynamic reaction of MMC even at zero output frequency utilizing leg offset voltage infusion. The leg offset voltage for balancing the arm energy is delivered by coordinate estimation without the circulating current control circle controller. The ac machine has been driven from stop to evaluated speed without intemperate cell capacitor voltage swells using the modern Fuzzy logic controller (FLC) is proposed methodology. The simulation outcomes check that steady operation and compare the outcomes is ensured down to <2% of the evaluated speed under 40% phase stack torque aggravation.