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:
May. 05, 1992
Filed:
Mar. 01, 1991
Hiromasa Higasa, Takamatsu, JP;
Fumihiko Ishikawa, Takamatsu, JP;
Shigenori Matsumura, Takamatsu, JP;
Sueo Sakata, Amagasaki, JP;
Masayoshi Kumano, Amagasaki, JP;
Shikoku Research Institute Incorporated, Takamatsu, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a power interconnection system between an electric power system and a power converter which makes AC power from a DC power source, a positive feed-back loop is constituted so as to include a frequency deviation detector, a band-pass filter, an inert zone circuit, an amplifier, an adder, a phase controller, an inverter controller, an inverter and an interconnection reactor. Thereby a sufficiently great frequency fluctuation is made after opening of a branch line switch, so as to produce a frequency abnormality signal to be given to a disconnection switch; and disconnection is made certainly.