Novel voltage spectra investigation of space vector modulation technique

In the inverter-fed ac drives the space vector modulation technique is the most popular and wide spread one since it produces a high quality inverter-fed ac drive especially for low and middle amplitudes of motor voltages. For realization of the space vector PWM usually two different PWM methods can be applied. This paper deals with the analysis and comparison of voltage spectra of these methods and the derivation of the analytical equations of motor voltage harmonics for these PWM methods. It is shown that for the infinite value of the sampling frequency all realization methods produce the same voltage spectrum which is characterized by the relatively simple equation. This expression also ensures an accurate computation of voltage, current and torque harmonics for the relatively low value of the sampling frequency.