Devices and methods for detecting islanding operation of a...

Details Devices and methods for detecting islanding operation of a... Devices and methods for detecting islanding operation of a...

2006-09-12

2006-09-12

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

C361S187000

Reexamination Certificate

active

07106564

ABSTRACT:
Devices and methods for detecting islanding operation of a static power source involve injection of a non-harmonic error on the phase angle of the static power source in regular steps to introduce a very small intentional phase shift for the output voltage of the static power source in every voltage cycle which is corrected in each cycle in synchronization with the grid voltage in normal operation of the grid. In abnormal operation of a grid loss, this intentional small phase shift or error causes an intentional small frequency drift in each voltage cycle that continues in one cycle after another cycle. When the intentional frequency drift is over a preset level, a detection circuit starts to isolate the static power source from the grid to prevent islanding operation.

REFERENCES:
patent: 4878208 (1989-10-01), Seki et al.
patent: 5111377 (1992-05-01), Higasa et al.
patent: 5162964 (1992-11-01), Higasa et al.
patent: 5493485 (1996-02-01), Okado
patent: 5686766 (1997-11-01), Tamechika
patent: 5808449 (1998-09-01), Hirayama et al.
patent: 6107784 (2000-08-01), Nomiya et al.
patent: 6172889 (2001-01-01), Eguchi et al.
patent: 6188145 (2001-02-01), Stewart
patent: 6219623 (2001-04-01), Wills
patent: 6362988 (2002-03-01), Deng et al.
patent: 6429546 (2002-08-01), Ropp et al.
patent: 6815932 (2004-11-01), Wall
Anil Tuladhar, U.S. Appl. No. 10/345,871, filed Jan. 15, 2003, entitled “Anti-Islanding Device and Method for Grid Connected Inverters Using Random Noise Injection.”.

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