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Different solutions are found to support the transient behavior
of cage induction generators in case of changes in the grid
voltage. Mechanically switched capacitors, SVC, Synchronous
Condensers and Voltage Source Static Var Compensator such
as the STATCOM can be used to regulate voltage as shunt
compensator to improve the grid interface of directly connected
asynchronous wind generators. Thyristor-controlled static var
compensators (SVCs) have been reported in [6], [7] for voltage
support of critical loads, transient stability improvement and
power oscillation damping in electric power transmission systems.
The STATCOM has the same capabilities, as reported in
[8], [9], but with a higher control bandwidth and the additional
capability of providing higher currents at low voltage levels.
Studies of transient stability of induction generators related to
the use of a STATCOM have been reported in [10], [11], and
a general analysis of the ride through capability of fixed-speed
wind farms with a STATCOM is provided in [12], [13].
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