Induction electrical power generating system with variable numbers of poles and excitation frequency

摘要

The invention is an induction electrical power generation system for generating alternating current varying within a frequency range; the system includes an induction electrical generator (52) for generating the alternating current having a rotor and a stator, the stator having at least one phase winding for outputting the generated alternating current and a plurality of poles with at least two different numbers of poles within the plurality of poles being selected to generate the alternating current, an exciter winding wound on the stator which is driven by AC excitation which varies in frequency during generation of the alternating current and the rotor operating with slip during the generation of the alternating current; a variable speed drive coupled to the rotor for driving the rotor in a speed range during generation of the alternating current; an exciter generator (54) coupled to the exciter winding for generating the variable frequency AC excitation; a speed sensor (56) for producing a signal which is a function of the speed of rotation of the rotor; and a controller (58), coupled to the inverter and responsive to the rotor speed signal, for commanding variation of the excitation frequency as a function of the rotor speed signal, a selection of the at least two different numbers of poles within the plurality of poles as a function of the rotor speed signal to control generation of the alternating current within the frequency range and a magnitude of excitation current produced by the exciter generator.