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Dynamic simulation of doubly-fed induction generator under disturbances

Doubly-fed induction generators (DFIG) are widely used in the wind farms. Many papers focus on their behavior connecting to an infinite bus and the influence on the power system stability ignoring the grid side converters. In this paper, the dynamic simulation of doubly-fed induction generators on multi-machine power system is studied. With the decoupled active and reactive power control scheme, compensated terms of the rotor voltage control are used to simplify the solution of rotor currents, the relationship between PI control and the induction generators is illustrated. Under the wind disturbance, maximum power tracking during the mode change of the induction generators, i.e. from sub-synchronous mode to super-synchronous mode and the power contribution of rotor side converters under the mode change are shown. Under the grid fault, the PI controllers' contribution to the over-voltage of rotor side converters and the difference between active power of rotor side converters and grid side converters are investigated.