1118 / 2019-05-20 22:55:38

Contribution of Doubly Fed Induction Generators to System Frequency Regulation

DFIG,inertia,pitch angle adjustment,frequency regulation,prime frequency

With the increasing penetration of wind power generation into electrical power systems， the lack of system inertia has become a particular concern as the power-electronics interfaces will decouple the wind turbine generators from the power grid. In order to operate the wind turbine generators to participate in the frequency regulation, this paper proposes a coordinated control scheme which is realized by adjusting the pitch angle and rotor dc-link voltage reference of doubly fed wind turbine (DFIG). In the proposed scheme, the dc-link voltage adjustment can accelerate the frequency response while the pitch angle adjustment can increase the reserve capacity of the frequency adjustment and decreased the required size of the dc-link capacitors. The proposed control scheme has been demonstrated through a power system model simulated in MATLAB/Simulink environment and its performance is evaluated for grid disturbances of faults and load changes.