Electrical transmission or interconnection systems – Plural load circuit systems – Anticoupling of load circuits through same source
Reexamination Certificate
2006-11-21
2006-11-21
Deberadinis, Robert L. (Department: 2836)
Electrical transmission or interconnection systems
Plural load circuit systems
Anticoupling of load circuits through same source
Reexamination Certificate
active
07138728
ABSTRACT:
Techniques for detecting an island in a system including a node that is operatively coupled to a primary power source (e.g., grid) and one or more distributed power generation sources are disclosed. In one embodiment, a current pulse is included in the output of a distributed power source. The grid voltage is monitored at the node to determine if a pulse-related disturbance occurs. If the grid is present, no pulse-related disturbance will manifest. If grid is down, then a pulse-related disturbance will manifest. Detection of the pulse-related disturbance is used to signal island detection.
REFERENCES:
patent: 4694188 (1987-09-01), Diegel et al.
patent: 4788619 (1988-11-01), Ott et al.
patent: 5369353 (1994-11-01), Erdman
patent: 5493485 (1996-02-01), Okado
patent: 5686766 (1997-11-01), Tamechika
patent: 5808449 (1998-09-01), Hirayama et al.
patent: 6118187 (2000-09-01), Hepner et al.
patent: 6172889 (2001-01-01), Eguchi et al.
patent: 6219623 (2001-04-01), Wills
patent: 6239997 (2001-05-01), Deng
patent: 6282104 (2001-08-01), Kern
patent: 6288456 (2001-09-01), Cratty
patent: WO01/11763 (2001-02-01), None
H. Haeberlin, J. Graf, and Ch. Beutler. “Islanding of Grid-connected PV Inverters: Test Circuits and Test Results,” IEA-PVPS Task V: Workshop about Grid Interconnection of Photovoltaic Power Systems, Sep. 15-16, 1997, pp. 1-9.
P. O'kane and B. Fox. “Loss of Mains Detection for Embedded Generation by System Impedance Monitoring,” Developments in Power System Protection Mar. 25-27, 1997, pp. 95-98.
PCT International Search Report dated Sep. 30, 2003 of International Application No. PCT/US02/34250 filed Oct. 25, 2002.
Dawson, Doug et al., Utility Interconnection Protection Requirements for Dispersed Photovoltaic Systems, Quarterly Highlights of Sandia's Photovoltaics Program Jan./Mar. 1997, pp. 1-12.
Stevens, John, The Interconnection Issues of Utility-Intertied Photovoltaic Systems, Sandia Labs., SAND87-3146, Jun. 1997 pp. 3-29.
Wills, Robert H., The Interconnection of Photovoltaic Power Systems with the Utility Grid: An Overview for Utility Engineers, Sandia Labs., SAND94-1057, Jun. 1994 pp. 5-40.
Starrs, Thomas et al., Barriers and Solutions for Connecting PV to the Grid, Presented at the annual conference of the American Solar Energy Society Jun. 1998, Albuquerque, NM 6 pages.
Stevens, John et al., Development and Testing of an Approach to Anti-Islanding in Utility-Interconnected Photovoltaic Systems,Photovoltaic System Applications Department, Sandia Nat'l Labs., Albuquerque, NM 18785-0753, Aug. 2000, pages cover-58.
Kern, G.A., et al., Results of Sandia National Laboratories Grid-Tied Inverter Testing, presented at 2ndWorld Conference and Exhibition on Photovoltaic Solar Energy Conversion, Jul. 6-10, 1998, Vienna, Austria.
LeRow Kevin E
Welches Richard S
Deberadinis Robert L.
Maine & Asmus
Youtility Inc.
LandOfFree
Anti-islanding techniques for distributed power generation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Anti-islanding techniques for distributed power generation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anti-islanding techniques for distributed power generation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3625945