A New Hybrid Three-Phase Multilevel Inverter Devoted to Electric Drive with Constant Volt per Hertz Control

In this paper, a novel hybrid three-phase multilevel inverter (MLI) is suggested in which the ratio of exploited switches versus the generated voltage levels is reduced. This ratio is mentioned as a critical factor due to its direct effects on the implementation costs, efficiency, and volume of the system. Each phase of the recommended MLI comprises the cascaded connection of the suggested basic module(s) and an auxiliary module, so the proposed topology is called a hybrid one. The auxiliary module is utilized to double the voltage levels in each phase. Furthermore, the presented MLI is allocated to control of the induction motor (IM). As a mature and simple method for controlling the speed of the IMs, the constant Volt per Hertz (CVH) is chosen and applied for the suggested inverter. The LS-PWM is utilized to reach this goal due to its controllability on the value and frequency of the output. Moreover, to validate the performance of the applied method and the feasibility of the presented circuit, a comprehensive simulation is done through the MATLAB/Simulink. Besides, the merits and superiorities of the suggested MLI over some other inverters are investigated.