Electrical transmission or interconnection systems – Plural supply circuits or sources – Sources distributed along load circuit
Reexamination Certificate
2011-03-15
2011-03-15
Wallis, Michael Rutland (Department: 2836)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Sources distributed along load circuit
C307S129000, C361S062000
Reexamination Certificate
active
07906870
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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Perkins Coie LLP
PV Powered, Inc.
Rutland Wallis Michael
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