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SYSTEM AND METHOD FOR ISLANDING DETECTION AND PREVENTION IN DISTRIBUTED GENERATION

United States Patent Application

20150380940
A1
View the Complete Application at the US Patent & Trademark Office
A method for detecting and preventing islanding includes issuing a command to an inverter connected to a power source, where the inverter is coupled to a power grid and supplies power to the power grid, the command causes a frequency of a waveform output by the inverter to vary, and the frequency of the waveform output by the inverter is a command frequency, determining that a amount of change of the command frequency is a constant value for a predetermined amount of time, removing the power supplied by the inverter from the power grid, and determining whether the power grid is valid.
Bhowmik, Shibashis (Charlotte, NC), Mazhar, Iman (Charlotte, NC), Parkhideh, Babak (Charlotte, NC)
14/ 737,468
June 11, 2015
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH/DEVELOPMENT [0002] This invention was made with Government support under Award Number DE-EE0006459 by the Department of Energy. The Government has certain rights in the invention.