The active and reactive power decoupling control for the double-fed induction generator wind turbines(DFIG) does
not play a positive role to the frequency response ability of power grid because it performs as the hidden inertia for the
power grid. If we want to improve the transient frequency stability of the wind turbine when it is integrated with the
system, we must ameliorate its frequency response characteristics. The inability of frequency control due to DFIG
decoupling control could be overcome through releasing (or absorbing) a part of the kinetic energy stored in the rotor, so
as to increase (or decrease) active power injected to the power system when the deviation of power system frequency
appears. This paper discusses the mathematical model of the variable speed DFIG, including the aerodynamic model,
pitch control system model, shaft model, generator model and inverter control model, and other key components,
focusing on the mathematical model of the converters in rotor side and grid side. Based on the existing model of wind
generator, the paper attaches the frequency control model on the platform of the simulation software
DIgSILENT/PowerFactory. The simulation results show that the proposed control strategy can response quickly to
transient frequency deviation and prove that wind farms can participate in the system frequency regulation to a certain
extent. Finally, the result verifies the accuracy and plausibility of the inverter control model which attaches the frequency
control module.
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