US 5,276,353 AGranted

Speed stabilization apparatus for two shaft gas turbine

AssigneeEbara Corporation

InventorsToshimitsu Kobayashi, Koji Oda, Athusi Saigusa

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Abstract

A speed stabilization apparatus for use in a two shaft gas turbine is disclosed which includes a speed detector for detecting a rotational speed of a driving shaft of a turbine for driving a generator, a governer for controlling the amount of fuel supplied to a cumbustor, a plurality of delay circuits for providing load charging delay signals after predetermined time periods from when load charging commands are generated, and a forcible fuel supply control circuit. The governer usually controls the amount of fuel to the combustor in accordance with the detected speed signal from the detector so as to stabilize a rotational speed of the generator. When a load charging command is generated, the forcible fuel supply control circuit causes the governer controlling such that the full amount of fuel in supplied to the combustor. After the predetermined time duration from that, the corresponding charging load is connected to an output of the generator.

Claims15

Dependent claims

In a speed stabilization apparatus for stabilizing a rotational speed of a two shaft gas turbine system including a generator, a load driving shaft coupled with an output turbine for driving said generator, a compressor, a compressor driving shaft coupled with a compressor driving turbine for rotating said compressor, and a combustor adapted to be supplied with fuel through a fuel pipe having a fuel valve and air from said compressor for supplying fuel gas through said compressor driving turbine to said output turbine, said stabilization apparatus comprising rotational speed detection means for detecting a rotational speed of said load driving shaft to provide a rotational speed signal and governor means in response to said rotational speed signal for stabilizing the rotational speed of said load driving shaft by opening said fuel valve when the rotational speed of said load driving shaft is decreased and by closing said fuel valve when the rotational speed of said load driving shaft is increased,

the improvement comprising a load charging dip restriction unit including:
load charging delay time counting means in response to a load charging command to count a load charging delay time;
charging load connecting and releasing means for connecting a charging load to said generator when the load charging delay time has been counted and in response to a load disconnecting command for releasing the charging load from said generator;
charging load presetting means for presetting a charging load to produce a charging load signal proportionally representing a preset charging load;
basic load measurement means for measuring a basic load on the basis of an electric output of said generator to produce a basic load signal representing a basic load;
forcible opening valve control means for producing a forcible opening valve signal when the charging load signal is larger than the basic load signal as a result of a comparison between the charging load signal and the basic load signal;
and
forcible opening valve means in response to the load charging command only when the forcible opening valve control signal is output for directly supplying a forcible opening valve signal through said governor means to said fuel valve so as to forcibly open said fuel valve during a forcible opening valve period.

5 more elements

A speed stabilization apparatus for stabilizing a rotational speed of a two shaft gas turbine system including a generator, a load driving shaft coupled with an output turbine for driving said generator, a compressor, a compressor driving shaft coupled with a compressor driving turbine for rotating said compressor, and a combustor adapted to be supplied with fuel through a fuel pipe having a fuel valve and air from said compressor for supplying fuel gas through said compressor driving turbine to said output turbine, said stabilization apparatus comprising first rotational speed detection means for detecting a rotational speed of said load driving shaft to provide a rotational speed signal and governor means in response to said rotational speed signal for stabilizing the rotational speed of said load driving shaft by opening said fuel valve when the rotational speed of said load driving shaft is decreased and by closing said fuel valve when the rotational speed of said load driving shaft is increased,

the improvement comprising a load charging dip restriction unit including:
load charging delay time counting means in response to a load charging command to count a load charging delay time;
charging load connecting and releasing means for connecting a charging load to said generator when the load charging delay time has been counted and in response to a load disconnecting command for releasing the charging load from said generator;
presetting means for presetting a value representing a maximum rotational speed of said compressor to produce a preset speed signal;
second rotational speed detection means coupled with said compressor driving shaft to produce a compressor rotational speed signal;
forcible opening valve control means for producing a forcible opening valve signal when the preset speed signal is larger than the compressor rotational speed signal as a result of a comparison between the preset speed signal and the compressor rotational speed signal;
and
forcible opening valve means in response to the load charging command only when the forcible opening valve control signal is output for directly supplying a forcible opening valve signal through said governor means to said fuel valve so as to forcibly open said fuel valve during a forcible opening valve period.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/931,422Filed 24 Aug 1992 · continuation
Priority: 12 Dec 1990
Granted: 4 Jan 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F02C 9/28
Control of fuel supply: regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed
F05D 2270/02
Purpose of the control system: to control rotational speed
F05D 2270/022
To control rotational speed: to prevent underspeed
F05D 2270/023
To control rotational speed: of different spools or shafts