Quick regulation of sinusoidal output current in PWM converter-inverter system

An induction motor drive system composed of a current-output-type converter and a current-source inverter with sinusoidal input and output voltage/current is presented. Pulse-width modulation (PWM) strategies with gate turnoffs were applied to the converter and the inverter sections in order to reduce the current harmonics and suppress the motor torque pulsation. A method for quick regulation of the AC output current amplitude that was applied to the PWM inverter section is presented. To demonstrate the improvement in the current response of the inverter, the slip frequency/current regulation of an induction motor is considered. The experimental results obtained for steady-state and dynamic operations of the motor are shown. The merits and demerits of this control method are discussed.<>