System and method for synchronizing an auxiliary electrical generator to an electrical system
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United States of America Patent
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Mar 26, 2013
Grant Date -
May 19, 2011
app pub date -
Jan 25, 2011
filing date -
Aug 21, 2007
priority date (Note) -
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Abstract
There is provided herein methods and apparatus for apparatus for controlling the interconnection of an auxiliary AC generator with an electrical system, such as an electrical distribution system, e.g., a utility grid. A measuring circuit measures the frequency of an auxiliary AC generator and the phase angle between one voltage phase of the generator and the correspondent voltage phase of the electric utility's electricity supply lines, i.e., the grid, each of which are averaged and filtered. The measured frequency of the auxiliary AC generator is matched to the frequency of the electrical system and the measured phase angle of the generator is matched to the electric utility's electricity supply lines. Once matching is achieved to within a defined tolerance, interconnecting contactors are closed.
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