Investigation into optimising high switching frequency regular sampled PWM control for drives and static power converters

A new high switching frequency regular sampled PWM control technique is presented, which significantly reduces the number of calculations required to generate PWM control in real-time. It is shown that this new PWM technique greatly simplifies the microprocessor software implementation, thereby considerably reducing the on-line computing requirements, and thus allows significantly higher switching frequency PWM to be generated using microprocessor techniques. Moreover, it is confirmed using both simulation and experimental results that this reduction in the computational burden does not significantly increase the harmonic distortion. Finally, it is shown that the new regular sampled PWM technique can be described and generated using both the conventional ‘per-phase’ and ‘spacevector’ techniques.