Interconnection for electric power system
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United States of America Patent
Stats
-
May 5, 1992
Grant Date -
N/A
app pub date -
Mar 1, 1991
filing date -
Mar 2, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a power interconnection system between an electric power system and a power converter which makes AC power from a DC power source, a positive feed-back loop is constituted so as to include a frequency deviation detector, a band-pass filter, an inert zone circuit, an amplifier, an adder, a phase controller, an inverter controller, an inverter and an interconnection reactor. Thereby a sufficiently great frequency fluctuation is made after opening of a branch line switch, so as to produce a frequency abnormality signal to be given to a disconnection switch; and disconnection is made certainly.
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