Permanent magnet synchronous generators with various designs and control strategies

This paper is focused on the designs and control strategies of permanent magnet synchronous generators (PMSG). Surface-mounted and interior permanent magnet machines are designed, with different machine parameters. Influence of the winding inductances on the voltage regulation and the short-circuit current of the PMSG with a diode rectifier is investigated, while the PMSG system with a PWM rectifier is supposed to obtain better performance and controllability, with little influence of the inductances. Furthermore, field-weakening method is proposed to extend the speed range, and the hysteresis current control method is employed to realize the field-weakening control. The field-weakening performance of the machines with different inductance values are then compared, so as to illustrate that a large d-axis inductance is preferable in order to obtain a good field-weakening effect.