Generating system with a regulated permanent magnet machine and an active rectifier

摘要

An electromechanical power transfer system (2) that transfers power between a prime mover (14) and a direct current (DC) electrical system (22, 24), comprises: a permanent magnet machine (PMM) (4) that has a permanent magnet (PM) rotor (6) coupled to the prime mover, a stator (8) with a multiphase alternating current (AC) winding coupled to an AC bus (20) and a control coil (10) with a winding that has a configuration to generate a magnetic field with flux that varies the reactance of the stator winding with the application of control coil current; a control coil current sensor (40) for generating a control coil current signal that is representative of the level of electrical current in the control coil; an electrical current sensor (34) for generating a DC bus current signal that is representative of the level of DC current through the DC bus; an electrical potential sensor (30) for generating a DC bus potential signal that is representative of the level of DC potential on the DC bus; a fixed pattern active rectifier and inverter system (18) coupled between the AC bus (20) and a DC bus (22); a position sensing system (12) for generating a rotor position signal that is representative of the angular position of the PM rotor; and a control coil current regulator system (48) that regulates the control coil current; wherein the control coil current regulator system receives the DC bus current signal in a DC bus current feedback loop (112) and the control coil current signal in a control coil current feedback loop (110) to generate a corresponding level of the control coil current that regulates current in the stator to a desired level and in a generating mode the fixed pattern active rectifier and inverter system receives the DC bus potential signal in a DC bus potential feedback loop (116) and the rotor position signal in a rotor position feedback loop (118) to maintain a constant potential on the DC bus regardless of sudden changes in electrical load on the DC bus.