Method and apparatus for detecting islanding operation of dispersed generator
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United States of America Patent
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Sep 15, 1998
Grant Date -
N/A
app pub date -
May 31, 1996
filing date -
May 31, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for detecting islanding operation of a rotating-machine type dispersed generator. The dispersed generator is interconnected with a main electric source through a circuit breaker to constitute an electric power system. The estimating method is implemented as follows: (a) changing electric power of the electric power system; (b) detecting frequency component of the electric power; and (c) deciding that an islanding operation of the dispersed generator is executed if the change of the frequency component becomes greater than a predetermined value. With this method, it becomes possible to detect the islanding operation of the dispersed generator even if the power flow at the interconnecting circuit breaker is generally zero.
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