Space vector PWM technique with minimum switching losses and a variable pulse rate

A novel PWM technique for three-phase voltage-controlled power inverters, based on the concept of voltage space vectors, is described. The minimum-loss, variable pulse rate (MLVPR) strategy, employing an implicit asymmetrical modulating function, results in the switching losses in the inverter reduced by half in comparison with the classic space vector PWM method. The pulse rate is varied from one 60° sector of the vector space to another, which produces spread, partly continuous spectra of the output voltage of the inverter. Theoretical analysis and results of experimental investigation of a prototype modulator are presented