Simplified circuit and modulation scheme for five-phase three-level voltage source inverter

The simplified circuit and modulation scheme is presented for a five-phase three-level voltage source inverter (FPTL-VSI). The simplified FPTL-VSI is a concatenation of a dual-buck stage and a two-level VSI (TL-VSI), and the space vector pulse width modulation (SVPWM) is used as the modulation scheme. Owing to the merit of the dual-buck stage which uses only four controllable switching devices, the TL-VSI can produce a three-level voltage waveform. By simplification of the space voltage vectors, a simplified SVPWM scheme can be obtained. Thus, the simplified FPTL-VSI reduces the hardware costs and improves the quality of the output voltage waveforms. Furthermore, the hardware implementation of the simplified SVPWM scheme can be easily realised. The experimental results prove the feasibility and validity of the proposed inverter and the modulation scheme.