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The paper examines two major implementations of inertial response in variable-speed wind turbine generators. Through time-domain simulations, these supplementary loops are compared based on their impact on grid frequency and the wind plant. Testing is performed on an isolated, hydrodominated power system benchmark, to which a DFIGbased wind plant is connected. The results show that when these implementations are combined, with proper coordination, the resulting controller is capable of superior performance.Index Terms-Doubly-fed induction generator (DFIG), frequency control, inertia, kinetic energy, variable speed wind turbine.

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Additional information is available at the end of the chapter http://dx.doi.org/10.5772/51953 . Introduction . . Grid interconnection requirementsReliable power system operation requires the continuous, instantaneous balance of supply and demand. Traditionally, power system planners have been familiar with a limited, wellunderstood amount of variability and uncertainty in demand and conventional generation. The large-scale integration of variable generation, such as wind power, gives rise to new challenges, requiring grid planners and operators to modify their traditional activities to maintain a secure, reliable operation of the power system. . . . Proliferation of wind powerFor more than a decade now, wind power has been driving the change in electric grids worldwide. Currently, wind energy serves % of the load energy in Denmark, % in Portugal, % in Spain, . % in Ireland and % in Germany. "lso, with GW of installed wind capacity in Europe, GW in China, and GW in the United States, it is fair to say that wind power has come to stay.Each year wind power is increasing its share of the global electricity production, Figure . "s penetration levels increase to the extent that conventional generators are displaced,