Pumping-up generator/motor system and method of operation of the same

Abstract From the Canadian patent

In a pumping-up generator/motor system comprising an induction generator/motor at least one, cyclo-converter connected to the secondary winding of the induction generator motor for controlling the rotational speed of the generator/motor in the motor mode and for maintaining the output frequency thereof in the generator mode at a constant level the center of, the speed range of the generator/motor in the generator mode is set near the synchronous speed thereof and a plurality of converter units constituting each cycloconverter are connected in parallel in the generator mode, and in series in the motor mode thereby allowing the capacity of the cyclo-converter to be made smaller.