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Significant barriers to interconnection are being perceived already
with the requirements of the new grid codes, and there
is a need for a better understanding of the factors affecting the
behavior of the wind farm under severe contingencies such as
voltage sags. Wind farms using squirrel cage induction generators
directly connected to the network will most acutely suffer
from the new demands, since they have no direct electrical control
of torque or speed, and would usually disconnect from the
power system when the voltage drops more than 10–20% below
rated value [5]. In general, fulfilment of LVRT by reactive compensation
will require fast control strategies for reactive power
in wind turbines/farms with cage induction generators.
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