Computer-aided analysis and implementation of optimized PWM waveforms for real-time control

A computer simulation technique for the synthesis and harmonic analysis of PWM waveforms is developed to investigate a wide range of operating modes using both time and frequency-domain analysis. The model can be combined with an electrical machine model to represent variable-speed drive systems or, alternatively, combined with a filter-load model and feedback control to simulate voltage regulating systems. An efficient modulation technique is achieved by an asymmetric PWM strategy and implemented using a Motorola 68020 microprocessor to give real-time control and generation of PWM waveforms.