Direct closed form output voltage control in PWM drive converters-philosophy, ideology, strategy, tactics

摘要

A novel approach enabling the synthesis of drive voltage source power converter control rules in universal closed formulations is considered. It provides a solid basis for software of a microprocessor operating in real time. The method is based on two-stage uninterrupted programmed modulation of the main, clock-point, and additional pulses and pauses between them, composing the line output voltage. This decreases the number of commutations per period, ensures smooth shockloss voltage variation during the whole adjustment process, as well as good DC link voltage utilization. Natural and artificial variants of such control technique have been analyzed. An attempt at control variety classification has been made. In such AC motor drive systems, the torque ripple of the induction motor can be reduced either by parasitic harmonic compensation or by intercompensation methods described here.