Published Paper Details:

This paper describes a novel approach to improve the power factor (PF) and reduce the harmonics generated by an adjustable-speed drive (ASD) using H-Infinity controller and feasible test is conducted to verify the experimental results. A High-Frequency current injection technique is used to improve the harmonic performance and PF. The High Frequency current at the same switching frequency is injected in the input of a front-end rectifier from the output of an HF inverter. All the switches are operated at zero-voltage switching. The diodes of the rectifier are also operated with soft switching at both turn-on and turn-off. Varying switching frequency with a fixed duty ratio regulates the output voltage. The main feature of this circuit is that it does not require any additional active devices for current injection. The inverter driving the IM is operated using an H-infinity sinusoidal pulse width-modulation technique. The circuit simulation results for 0.5-hp induction motor is presented.