SIMULATION OF MODEL REFERENCE ADAPTIVE PULSE WIDTH MODULATION TECHNIQUE

Abstract

A model reference adaptive pulse width modulated technique is analyzed and simulated in this dissertation. 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 MRA PWM technique has the advantage of inherent controlled constant volt-per-hertz (V/f) ratio operation and jitter-free operation with free-running carrier. Such features are of importance in variable speed a.c. drive applications where V/f control increases the control circuit complexity and where carrier frequency jumps cause harmful torque/speed transients.