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:
Feb. 09, 2016
Filed:
Nov. 12, 2013
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Tatsuro Yashiki, Tokyo, JP;
Yasuhiro Yoshida, Tokyo, JP;
Takuya Yoshida, Tokyo, JP;
Naohiro Kusumi, Tokyo, JP;
Kazunori Yamanaka, Tokyo, JP;
Kenichiro Nomura, Tokyo, JP;
Masaaki Tomizawa, Tokyo, JP;
Fumiyuki Suzuki, Tokyo, JP;
Yuichi Takahashi, Tokyo, JP;
Mitsubishi Hitachi Power Systems, Ltd., Yokohama, JP;
Abstract
Disclosed is a steam turbine power plant adapted to start operating safely even if prediction accuracy of its startup constraints cannot be obtained. The system calculates predictive values and current values of startup constraints of a steam turbine from process variables of plant physical quantities, next calculates in parallel both a first control input variable for a heat medium flow controller based on predictive values, and a second control input variable for a main steam control valve based on the current values, and while preferentially selecting the first control input variable, if the first control input variable is not calculated, selects the second control input variable instead. After the selection of at least one of the first and second control input variables, the system outputs an appropriate command value to the heat medium flow controller and the main steam control valve according to the kind of selected control input variable.