A single‐phase modular multilevel inverter based on controlled DC‐cells under two SPWM techniques for renewable energy applications.

This paper introduces a study of reduced devices count symmetric multilevel inverter (MLI) under two PWM techniques for AC applications. The MLI uses two DC sources to synthesize five‐level output voltage at a reduced switching devices number. The MLI employs five switching devices comprising the main and auxiliary circuits. The main circuit is a single‐phase H‐bridge inverter, which controls the output voltage polarity. The auxiliary circuit controls the input DC bus voltage by altering the number of the input DC cells to the frontend of the main circuit. Two PWM techniques are considered to control the MLI output based on minimum power loss and reduced total harmonic distortion, which in turn, elect the inverter application. To verify the effectiveness of the proposed MLI as well as the importance of the two PWM techniques, the five‐level inverter has been carried out experimentally using a laboratory prototype. DSPACE‐DS 1103 digital controller is utilized, to implement the experimental system controller, for controlled load voltage regulation. [ABSTRACT FROM AUTHOR]