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Method, memory media and apparatus for detection of grid disconnect

United States Patent

September 23, 2008
View the Complete Patent at the US Patent & Trademark Office
A phase shift procedure for detecting a disconnect of a power grid from a feeder that is connected to a load and a distributed generator. The phase shift procedure compares a current phase shift of the output voltage of the distributed generator with a predetermined threshold and if greater, a command is issued for a disconnect of the distributed generator from the feeder. To extend the range of detection, the phase shift procedure is used when a power mismatch between the distributed generator and the load exceeds a threshold and either or both of an under/over frequency procedure and an under/over voltage procedure is used when any power mismatch does not exceed the threshold.
Ye; Zhihong (Clifton Park, NY), Du; Pengwei (Troy, NY)
General Electric Company (Niskayuna, NY)
10/ 713,310
November 14, 2003
CROSS-REFERENCE TO RELATED APPLICATIONS The U.S. Government may have certain rights in this invention pursuant to contract number AND-1-30605-01 awarded by the U.S. Department of Energy.