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:
Jun. 19, 2007
Filed:
Dec. 09, 2003
Tai Furuya, Tokyo, JP;
Tadashi Kataoka, Tokyo, JP;
Terence Mckelvey, Tokyo, JP;
Eishi Marui, Tokyo, JP;
Motoyasu Sato, Fujisawa, JP;
Takahide Ozawa, Fujisawa, JP;
Shaojun Zheng, Fujisawa, JP;
Seiichi Ishihara, Fujisawa, JP;
Noboru Kinoshita, Fujisawa, JP;
Tai Furuya, Tokyo, JP;
Tadashi Kataoka, Tokyo, JP;
Terence McKelvey, Tokyo, JP;
Eishi Marui, Tokyo, JP;
Motoyasu Sato, Fujisawa, JP;
Takahide Ozawa, Fujisawa, JP;
Shaojun Zheng, Fujisawa, JP;
Seiichi Ishihara, Fujisawa, JP;
Noboru Kinoshita, Fujisawa, JP;
Ebara Densan Ltd., Tokyo, JP;
Abstract
To provide an interconnecting power generation system which can detect an abnormality in the utility power supply and can be isolated from a utility power system and can prevent damage to a turbogenerator. An interconnecting power generation system comprises: an interconnecting inverter; a voltage phase shift circuitwhich synchronizes the output voltage phase of the interconnecting inverterwith the utility power voltage phase and monitors zero crossings of the utility power voltage, and which shifts the output voltage phase from the utility power voltage phase and shifts the shifted output voltage phase to the utility power voltage phase; a phase comparatorfor comparing the voltage phase of the utility power systemand the output voltage phase of the interconnecting inverter; and an interconnection control unitwhich detects a power outage caused by an interruption of power supply from the utility power systembased on a series of a predetermined number of matching signals outputted from the phase comparatorand sends a control signal to a circuit breakerto shut off the output of the interconnecting inverterfrom the utility power system