Novel On-Line Microprocessor Generation of Harmonic Elimination and Minimisation PWM Control Strategies using Regular-Sampling Techniques

Abstract

This paper surveys recent research into the development of new optimal Regular-Sampled PWM techniques for both voltage source inverter (VSI) and current source inverter (CSI) drives.

It is shown how optimised PWM for VSI drives can be generated “on-line” in “real-time” using modified regular-sampling techniques, without resorting to the laborious, time-consuming, main-frame computer minimisation techniques normally associated with these PWM techniques. Using these new regular-sampling PWM techniques it is possible to produce a PWM drive performance which closely approximates the optimised PWM performance up to quasi-square wave operation.

In addition, a survey of a number of new high pulse number harmonic-elimination, harmonic minimisation, and optimal PWM techniques for CSI drives will be presented which minimise rotor speed ripple and positional error, and provide smoother rotor motion at low speeds.

Indexing terms:

• Regular sampled PWM techniques
• Harmonic-elimination
• Harmonic minimization