Method and system of control of the converter of an electricity generation facility connected to an electricity network in the presence of voltage sags in said network
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United States of America Patent
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Jun 14, 2011
Grant Date -
Jan 8, 2009
app pub date -
Dec 27, 2006
filing date -
Dec 30, 2005
priority date (Note) -
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Abstract
Method and system of control of the converter of an electricity generation facility of the type which comprises at least one electric generator, such as a wind generator, connected to an electricity network, in the presence of voltage sags in said network, the electric generator being a double-fed asynchronous generator formed by two windings, a winding in the stator, directly connected to the network, and a winding in the rotor which is fed on normal regime by said converter which imposes on it a predetermined voltage current called setpoint current. In the event of a voltage sag occurring, the converter imposes a new setpoint current which is the result of adding to the previous setpoint current a demagnetizing current which generates a flow in the rotor winding opposed to the free flow, consequently reducing the voltage in converter connectors.
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