METHOD, MEMORY MEDIA AND APPARATUS FOR DETECTION OF GRID DISCONNECT
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United States of America Patent
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Sep 23, 2008
Grant Date -
Oct 2, 2008
app pub date -
Nov 14, 2003
filing date -
Nov 14, 2003
priority date (Note) -
Granted
status (Latency Note)
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Abstract
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.
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