Devices and methods for detecting islanding operation of a static power source
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United States of America Patent
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-
Sep 12, 2006
Grant Date -
Aug 7, 2003
app pub date -
Dec 23, 2002
filing date -
Jan 16, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Devices and methods for detecting islanding operation of a static power source involve injection of a non-harmonic error on the phase angle of the static power source in regular steps to introduce a very small intentional phase shift for the output voltage of the static power source in every voltage cycle which is corrected in each cycle in synchronization with the grid voltage in normal operation of the grid. In abnormal operation of a grid loss, this intentional small phase shift or error causes an intentional small frequency drift in each voltage cycle that continues in one cycle after another cycle. When the intentional frequency drift is over a preset level, a detection circuit starts to isolate the static power source from the grid to prevent islanding operation.
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