In this chapter, a simple aggregated model of large wind farm in the small signal stability analysis is employed. We assume that currently the operating conditions of all wind generators in a wind farm are same, and the wind farm is considered to be formed with a number of wind generators jointed in parallel. Therefore, the wind farm can be reduced to a single machine equivalent. For a wind farm consisted of N wind generators, the values of stator and rotor voltages are same as the value of single machine. The stator and rotor currents are N times larger than the single machine. The stator and rotor resistances and reactances as well as K2 are 1/N larger than the single machine. The remaining control parameters are same as the single machine.
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