ABSTRACT
This chapter shows that the trinary hybrid multilevel inverter (THMI) has greatest levels of output voltage using the same number of H-Bridges (HBs) among the multilevel inverters using HBs connected. The THMI has the greatest levels of output voltages using the same number of HBs among multilevel inverters with HBs connected. The chapter investigates five modulation strategies for THMI. They are the step modulation strategy, the virtual stage modulation strategy, the hybrid modulation strategy, the sub-harmonics pulse width modulation strategy, and the simple modulation strategy. The high-frequency modulation strategies used in hybrid multilevel inverters include the hybrid modulation strategy and the subharmonic pulse-width-modulation (PWM) strategy. In the step modulation strategy, the output voltage levels of the multilevel inverter limit the number of eliminated lower-order harmonics. The chapter presents the hybrid modulation strategy for the hybrid multilevel inverters, which incorporates stepped voltage waveform synthesis in higher-power HB cells in conjunction with high-frequency variable PWM in the lowest-power HB cell.
