It is now recognized that many large wind farms
will employ doubly fed induction generator (DFIG) variable
speed wind turbines. A number of such wind farms are already
in operation and more are planned or under construction. With
the rising penetration of wind power into electricity networks,
increasingly comprehensive studies are required to identify the
interaction between the wind farm(s) and the power system. These
require accurate models of doubly fed induction generator wind
turbines and their associated control and protection circuits. A
dynamic model has been derived, which can be used to simulate
the DFIG wind turbine using a single-cage and double-cage
representation of the generator rotor, as well as a representation of
its control and protection circuits. The model is suitable for use in
transient stability programs that can be used to investigate large
power systems. The behavior of a wind farm and the network
under various system disturbances was studied using this dynamic
model. The influence of the DFIG control on the stability of the
wind farm was also investigated by considering different control
gains and by applying network voltage control through both stator
side and rotor side converters.
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发表于 2011-10-29 18:24:18
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