| Abstract |
The present cost and operating constraints of voltage-source power electronic converters (VSC) limit their applications in the control of variable speed motors and generators in the multi-megawatt power range. For high power applications where only a small continuous operating zone around the machine rated values is required, the doubly fed induction motor/generator (DFIM/DFIG) provides an economic solution.
The operating limits of a doubly fed machine are mainly determined by the rating of the rotor power electronic converter. Until now, literature has stressed the relation between active power in the rotor and speed range of the machine. In this paper, the electric loading of the rotor windings and the frequency converter is more deeply examined, as a function of speed range and stator reactive power. This is done using an equivalent circuit of the doubly fed machine.
In a next step, a dynamic simulation of a doubly fed induction generator is made. This allows assessing the impact of a grid disturbance on the machine behaviour. |
