Power plants – Combustion products used as motive fluid
Patent
1990-06-28
1994-04-12
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
60 39182, F02C 618
Patent
active
053014995
ABSTRACT:
A system and method for anticipating and controlling overspeed in a combined cycle turbine of the type having a gas turbine with a fuel flow control valve and a steam turbine with at least one steam control valve both disposed on a single shaft and having a heat recovery steam generator heated by said gas turbine and connected to supply steam to the steam control valve, the combined cycle turbine having a unified control system and driving a load. Below a preselected shaft speed the gas turbine fuel command signal controls power. Above the preselected shaft speed the steam turbine speed signal also controls power. Anticipation of overspeed under severe transient load changes, such as loss of electrical load, is provided by a power load unbalance system, wherein gas turbine power and steam turbine power responsive signals are summed after proportionately scaled power responsive signals exceed load by a preselected amount, whereby appropriate action is taken to reduce power before significant overspeed can occur.
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Kure-Jensen Jens
Moore James H.
Rowen William I.
Casaregola Louis J.
General Electric Company
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