Control system for doubly fed induction generator
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United States of America Patent
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Aug 12, 2008
Issued Date -
N/A
app pub date -
May 3, 2004
filing date -
May 2, 2003
priority date (Note) -
Reissued
status (Latency Note)
Importance
Abstract
A controller (28) for a doubly fed induction generator (12,20) adjusts control signals to a rotor side converter (24) and line side converter (22) to adjust rotor current when a voltage transient on a utility grid (10) occurs, so that the doubly fed induction generator can ride through the transient. The controller can also turn off the transistors of the rotor side converter (24) to reduce rotor current and/or activate a crowbar (42) to reduce the voltage of the DC link (26) connecting the converters (22, 24) when significant voltage transients occur on the grid (10). This permits continued operation of the DFIG system without disconnecting from the grid.
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