Stator Field Oriented Control of Doubly-Excited Induction Machine in Wind Power Generating System
نویسندگان
چکیده
Optimal operation of a wind power generating system is featured by the variable-speed constant-frequency mode in which maximum-power-capturing from the wind turbine and constantfrequency-interfacing with the power system are the primary concerns. A slip power recovery system with a doubly excited wound rotor induction machine is attractive in this situation. In this paper, field orientation control for doubly-excited induction machines is studied. Since the operational condition and control objectives of the variable-speed constant-frequency generating system are significantly different from those of a variable speed drive system, implementation strategy of field orientation control of induction machines must be re-examined. A stator field orientation control method suitable for the doubly excited induction machine in a wind power generating system is developed. Digital simulation is carried out showing that the doubly excited induction generator with the proposed control strategy can track the optimal torque-speed profile of a wind turbine very well. In addition, flexible reactive power control is also accomplished.
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