The multilevel inverter occupancy rate has increased since the last decade. Multilevel converter is suitable for high power application as a result of their ability to synthesize waveforms with an improved harmonic spectrum and faithful output. In conventional cascade H-bridge is that when the voltage increases, an increase in the number of semiconductor switches and also the source requirement increases. In order to overcome this introduced a new topology of cascaded H-bridge. This new topology gives less order of THD with controlled tension. This paper presents seventeen level inverter with PWM techniques that are used in Hybrid Electric Vehicle for very high efficiency to stabilize as a result of the inverter output voltage. With 5-level and 17-level, we can distinguish that the manner in which THD influence by increasing the levels in both cases, in MATLAB Simulink. Cascade PWM converter is used for the advantage of simple control strategy. PWM (Pulse Width Modulation) method is used to generate the gate drive signal to the controller. However, the proposed topology be expanded with an n-level inverter.
Keywords : Multilevel Inverter, PWM, Cascade H-Bridge Topology, THD.