The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 2011
Filed:
Oct. 15, 2007
Applicant:
Dal Y. Ohm, South Riding, VA (US);
Inventor:
Dal Y. Ohm, South Riding, VA (US);
Assignee:
PV Powered, Inc., Bend, OR (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02J 1/00 (2006.01); H01H 47/20 (2006.01); H02H 3/00 (2006.01);
U.S. Cl.
CPC ...
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.