Pulsewidth Modulation Strategies (original) (raw)

I n power electronics, pulsewidth modulation (PWM) has been the subject of intensive research and is widely employed to control the output voltage of static power converters. A large variety of feed-forward and feedback control schemes has been described in the literature [1]-[3], but the most widely used methods of PWM are the sinusoidal PWM (SPWM) and the space vector PWM (SVPWM). In SPWM, introduced by Schönung in 1964 [4] to produce the output voltage waveform, a sinusoidal control signal (modulating control signals) is compared with a triangular signal (carrier signal). An SVPWM uses complex voltage vector for control. Although one of the first suggestion for employing the complex voltage vector in PWM control was made by Jardan et al. [5], the SVPWM technique was first published by Busse and Holtz [6] followed by Pfaff et al. [7] in the same year. Prof. Joachim Holtz has had a lifelong contribution and achievement in PWM [8]-[22]. He was one of the pioneers not only of SVPWM technique but also of the three-level inverter topology [23]. Most of his papers on the topic use SVPWM, but he has not neglected other possibilities, including new