Regular-sampled harmonic-elimination PWM control of inverter drives

Novel harmonic elimination PWM strategies for drives, uninterruptible power supplies and static power converters have been developed using modified regular-sampling techniques. These new PWM strategies can be generated on-line in real-time using a simple microprocessor software algorithm, without resorting to the usual time consuming off-line mainframe computer harmonic elimination numerical techniques. These new PWM techniques can be used over the complete voltage/frequency range of the drive up to and including the transition from PWM to quasi-square wave operation. Results from an experimental microprocessor controlled PWM inverter drive are presented to demonstrate and confirm the special feature of the new regular-sampled harmonic elimination PWM control strategies