SU1373836A1 - System for automatic regulation of gas turbine of steam-gas plant - Google Patents

Abstract

The invention allows to increase the reliability of the installation when the frequency of the network changes. The gas turbine automatic control system contains a rotational speed controller 8 with a rotational speed sensor 9 and a synchronizer 10, a regulator of gas gases, an adder 12, a sensor 13 and a gas generator 14, gas sensors 15 and 16 compressor and outside air, valve 17 supplying fuel to the combustion chamber. The sensor 18 of the mains frequency is connected through a series of non-linear non-linear units 19 and a block 20 of the type. The time delay is connected to the input of the adder 12. When the frequency of the network is changed, the gas turbine is transferred to the load while maintaining the network frequency. The opposite effect of the regulators 8 and 11 on the valve 17 when changing the mains frequency is excluded. 1 il. i (o

Description

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The invention relates to the control of steam power plants, in particular to devices for the automatic control of a gas turbine of a steam and gas plant.

The purpose of the invention is to improve reliability when changing the frequency of the network.

The drawing shows a functional diagram of an automatic control system for a gas turbine of a combined-cycle plant.

The steam and gas plant includes a boiler 1, a steam turbine 2, on the shaft of which the first generator 3 is located, a single-shaft gas turbine 4 with a compressor 5, a second generator 6 and a combustion chamber 7. The automatic gas turbine control system of the combined-cycle plant contains a speed controller 8 with a speed sensor 9 and a synchronizer 10, gases temperature controller 11, to the input of which are connected through an adder 12 a sensor 13 and a gas temperature setpoint 14. In addition to the gas temperature controller 11, the air temperature sensor 15 behind the compressor and the outside air temperature sensor 16 can be connected via an adder 12. A speed controller 8 is connected to the valve.

17 fuel supply to the combustion chamber, and the gas temperature controller 11 is connected to the synchronizer 10. Sensor

18 of the network frequency through successively connected non-linear blocks 19 of the Dead Band type and 20 of the Time delay type is connected to the input of the adder 12.

The system of automatic control of the gas turbine of the combined-cycle plant operates as follows.

When the network frequency changes, for example, in the direction of decreasing, the signal from the rotational frequency sensor 9 comes from the rotational frequency controller 8, which through the fuel supply valve 17 into the combustion chamber increases the fuel supply to the combustion chamber 7, thereby increasing the gas temperature and gas turbine power 4. With the values of the network frequency beyond the deadband, to which the non-linear unit is tuned. 19 VNIIPI Order 545/26

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such as the dead zone, for a time that excludes the appearance in the system of a short-term false

the signal over the network frequency for which the nonlinear block 20 of the type Time Delay is configured, the signal from the frequency network 18 through the adder 12, to which simultaneously

signals of the gas temperature setting device 14, the air pressure sensor 15 behind the compressor, and the outdoor air temperature sensor 16, are fed to the input of the gas temperature controller 11,

which, acting through the synchronizer 10 and the frequency regulator 8 on the valve 17 for supplying fuel to the combustion chamber, increases the supply of fuel to the combustion chamber 7.

In so doing, the gas turbine 4 is transferred to the new load while maintaining the mains frequency constant. This eliminates the opposite effect of the speed controllers 8.

and 11 the temperature of the gases on the valve 17 of the fuel supply to the combustion chamber when the frequency of the network.

Claims (1)

Invention Formula A gas turbine gas turbine automatic control system comprising a series-installed speed sensor, a speed controller and a valve for supplying fuel to the combustion chamber, as well as an adder, a non-linear dead band unit, a gas temperature controller, a sensor and a gas temperature setter different The fact that, in order to increase reliability when changing the frequency of the network, it additionally contains a network frequency sensor s rotation further has a second input, wherein the non-linear type time delay unit, the sensor and setpoint temperature of the gases through the adder is connected to the regulator torus gas temperature output connected to the second input of the regulator rotational speed and network frequency sensor through nonlinear element The dead zone type is associated with a nonlinear element of the type Time delay. Circulation 492 Subscription