System and method for anti-islanding, such as anti-islanding for a grid-connected photovoltaic inverter
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United States of America Patent
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Mar 15, 2011
Grant Date -
May 29, 2008
app pub date -
Oct 15, 2007
filing date -
Oct 13, 2006
priority date (Note) -
Expired
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Abstract
A system and method for detecting islanding in a Distributed Generation utility grid is described. In some examples, the system, via an inverter, injects a frequency disturbance to a location of the utility grid associated with a DG generator, measures both the frequency error due to the disturbance and the frequency drift of the location of the utility grid, and determines islanding based on a maximum value of the frequencies. In some cases, the system is able to reduce or minimize the Non-Detection Zone of the inverter by detecting islanding without always relying on a detectable frequency error due to an injected waveform.
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