New PWM inverter control based on optimal pulse pattern computation without phases symmetry constraints

The control of inverters has degrees freedom that open the way to improve output harmonic spectrum. Numerous works dealing with this objective have been proposed in literature, particularly within definition switching angles. Among them, well-known PWM techniques such as Quarter Wave Symmetry (QWS), Half (HWS), and Full (FWS) are based on Optimal Pulse Patterns (OPP) computation using symmetries angles constraints. In paper quality, symmetry constraints not considered leading a new OPP method: Phases Relaxation (PSR). To highlight interest PSR method, an evaluation terms Weighted Total Harmonic Distortion (WTHD) is performed. Simulation experimental tests conducted comparison well known FWS, highlighting strategy.