Scherbius drives with double-sided voltage-fed PWM converters

The application of the traditional Scherbius variable-speed control of winding induction drive motor is restricted by its speed-range, power factor and harmonic pollution etc.. In the paper, the scheme of doubly fed Scherbius system with double PWM rectifier is proposed, which can be used to control AC (alternating current) mine-elevator with reliable performance. The line-side PWM rectifier is controlled to remain the DC voltage stable in the variation process of rotor power by stator voltage-oriented vector control method. Internal model decoupling control is used to control the rotor-side PWM rectifier to realize decoupling completely and to operate PWM rectifier at unit factor. All conclusions are supported by simulation and practical experiments.