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An assessment on the capability of a doubly fed induction generator (DFIG) wind turbine for frequency regulation is presented. Detailed aerodynamic, structural and electrical dynamic models were used in this study. A control loop acting on the frequency deviation was added to the inertia contributing loop in order to enhance the inertia support from the DFIG wind turbine. The possibility of de-loading a wind turbine to provide primary and secondary frequency response was discussed. A frequency droop controller was examined where the droop is operating on the electronic torque set point below its maximum speed and is operating on the pitch demand at maximum speed. It is also shown that by reducing the generator torque set point the DFIG wind turbine can provide high frequency response.
Inspec keywords: machine control; power engineering computing; rotors; wind turbines; control system synthesis; asynchronous generators; mechanical engineering computing; wind power plants; frequency response
Other keywords:
Subjects: Wind power plants; Control of electric power systems; Asynchronous machines; Control system analysis and synthesis methods; Power engineering computing; Civil and mechanical engineering computing