A Model Reference Adaptive PWM Technique

A model reference adaptive (MRA) pulsewidth modulated (PWM) technique is presented and analyzed in this paper. With this technique, the near optimal inverter gating signals are determined through a closed loop process which compares a reference signal to a feedback signal derived from a built-in reference model of the load. In addition to its simplicity of implementation, the proposed PWM technique has the advantages of inherent controlled constant volts per hertz (V / f) ratio operation and jitter-free operation with free-running carrier. Such features are of importance in variable speed ac drive applications where V / f control increases the control circuit complexity and where carrier frequency jumps cause harmful torque/speed transients.