Power plants – Combustion products used as motive fluid – With closed pocket turbine
Reexamination Certificate
2006-07-18
2006-07-18
Casaregola, Louis J. (Department: 3746)
Power plants
Combustion products used as motive fluid
With closed pocket turbine
Reexamination Certificate
active
07076940
ABSTRACT:
A gas turbine control system is disclosed which operates to stabilize the system frequency in a case of transitional variations of the system frequency without making the strength of hot gas path parts of the gas turbine below a maximum stress value of the hot gas path parts. When a system frequency abnormality is detected, the output of the gas turbine is adjusted to recover the system frequency by making a gas turbine combustion gas temperature control inoperative. For this purpose, there are provided a logical circuit operative to make the gas turbine combustion gas temperature control disabled or inoperative in response to an abnormal system frequency detection signal, and a recovery circuit that operates to cancel the inoperative state of the gas turbine combustion gas temperature control. The detection of an abnormal system frequency may be carried out by an outside signal. An abnormality detection unit may be provided in a combined cycle plant.
REFERENCES:
patent: 3520133 (1970-07-01), Loft et al.
patent: 3638422 (1972-02-01), Loft et al.
patent: 5142860 (1992-09-01), Strange et al.
patent: 8-218897 (1996-08-01), None
“Dynamic Behavior of Combined Cycle Power Plant for Frequency Drop”, The Transactions of the Institute of Electrical Engineers of Japan, vol., 122-B, No. 3, Mar. 1, 2002, pp. 391-400.
Hirayama Kaiichirou
Katauri Tomoo
Kobayashi, legal representative Hirokazu
Kobayashi, legal representative Sayoko
Kobayashi, legal representative Yuka
Casaregola Louis J.
Kabushiki Kaisha Toshiba
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