Evaluation of High-Efficiency Two-Stage Inverters with Fixed Modulation Ratio SVPWM Control

To address the complexity of the SVPWM algorithm in inverter power supplies, this paper proposed a two-stage inverter power supply solution based on fixed modulation ratio SVPWM (FMRSVPWM). The pre-stage of proposed inverter is a Buck/Boost converter for voltage regulation, while the post-stage is a three-phase three-level (3L) inverter using fixed modulation ratio SVPWM. This solution not only greatly simplifies the algorithm but also reduces switching losses of the devices and improves efficiency. Efficiency can be further enhanced by adopting discontinuous SVPWM (DSVPWM) and using SiC & Si hybrid devices on the basis of FMRSVPWM.