JP4885199B2 - Gas turbine operation control apparatus and method - Google Patents

Description

  The present invention relates to a gas turbine operation control apparatus and method.

Conventionally, for example, if the start-up time of a combined cycle power generation system becomes long, the operation time at a partial load with poor plant efficiency becomes long, so that shortening of the start-up time has been a problem from the viewpoint of economy and environmental load.
Generally, it is known that a single-shaft combined cycle power generation system in which a gas turbine and a steam turbine are coaxially arranged controls the rate of increase in shaft output to be constant. In the case of a multi-shaft combined cycle power generation system in which a gas turbine and a steam turbine are provided on separate axes, it is known that the rate of increase in the output of the gas turbine is controlled to a uniform value over the entire load range. ing.
JP 2001-207808 A

  However, if the increase rate of the shaft output is controlled to be constant, the increase rate of the gas turbine output is limited, and there is a problem that it takes time to start up the single-shaft combined cycle power generation system. In addition, in a multi-shaft combined cycle power generation system, the slow rate of increase in the high load range is adopted uniformly throughout the entire load range, and the rate of increase in the low load range is also limited. There was a problem that it took.

  The present invention has been made to solve the above problems, and an object thereof is to provide a gas turbine operation control device and method that can shorten the start-up time of a combined cycle power generation system.

In order to solve the above problems, the present invention employs the following means.
The present invention has a gas turbine, a steam turbine, and a generator arranged on one shaft, a combustor for supplying combustion gas to the gas turbine, and a flow rate adjusting valve provided in a fuel flow path for supplying fuel to the combustor. When, a gas turbine operation control device for a single-shaft combined-cycle power generation system and a flow control means for controlling the flow amount adjusting valve, the flow rate control means, at the time of startup of the single-shaft combined cycle power generation system, the shaft A combined operation cycle having a normal operation mode in which the output is increased at a specified rate of change and a quick start mode in which the gas turbine output is increased at a specified rate of change within a range in which the shaft output does not exceed the specified maximum shaft output. Provided is a gas turbine operation control device characterized in that either one can be selected at the time of starting a power generation system .

According to such a configuration, the gas turbine, the steam turbine, and the generator are arranged on one axis,
A single-shaft combined cycle power generation system comprising a combustor for supplying combustion gas to a gas turbine, a flow rate adjusting valve provided in a fuel flow path for supplying fuel to the combustor, and a flow rate control means for controlling the flow rate adjusting valve In the gas turbine operation control device, the flow rate control means increases the gas turbine output at a constant rate of change within a range in which the shaft output does not exceed a prescribed maximum shaft output when the combined cycle power generation system is started. In this way, at startup, the gas turbine output is increased at a constant rate within a range that does not exceed the maximum shaft output. Therefore, the gas turbine output can be increased more quickly than in the conventional method in which the shaft output is increased at a constant rate. It is possible to raise it. As a result, the shaft output can be quickly increased, and the startup time of the combined cycle power generation system can be shortened.
Further, in this way, the flow rate control means, at the time of starting the combined cycle power generation system, in a normal operation mode in which the shaft output is increased at a specified rate of change, and in a range where the shaft output does not exceed the specified maximum shaft output, Since one of the rapid start modes for increasing the gas turbine output at a predetermined rate of change is made selectable, an appropriate mode can be selected and used according to the situation.

The present invention combines a gas turbine, a steam turbine, and a generator to supply a combustion gas to the gas turbine, a flow rate adjusting valve provided in a fuel flow path for supplying fuel to the combustor, A combined cycle power generation system gas turbine operation control device comprising a flow rate control means for controlling a flow rate regulating valve, wherein the flow rate control means at a start of the combined cycle power generation system, the shaft output at a specified rate of change. a normal operation mode to increase, to the extent that the axial output does not exceed the maximum shaft output prescribed, has a quick start mode and where Ru is increased at a predetermined rate which is determined in accordance with the gas turbine output to a load zone, the at the time of startup of the combined cycle power generation system, providing a gas turbine operation control device, characterized in that either there is a selectable That.

According to such a configuration, the gas turbine, the steam turbine, and the generator are combined, the combustor that supplies the combustion gas to the gas turbine, and the flow rate adjustment valve that is provided in the fuel flow path that supplies the fuel to the combustor. In the combined cycle power generation system gas turbine operation control device comprising the flow rate control means for controlling the flow rate adjusting valve, the flow rate control means is configured such that the shaft output does not exceed a prescribed maximum shaft output when the combined cycle power generation system is started. In range, the gas turbine output is increased at a rate of change determined according to the load band. Thus, at the time of start-up, the gas turbine output is increased at a rate of change corresponding to the load band, so that the output of the gas turbine can be increased quickly compared to the conventional method of increasing the shaft output at a constant rate. Is possible. As a result, the shaft output can be quickly increased, and the startup time of the combined cycle power generation system can be shortened.
Moreover, each change rate determined according to a load zone is determined by the restrictions of each apparatus which comprises a combined cycle power generation system, for example. Thereby, since a suitable change rate can be selected according to a load zone, the starting time of a combined cycle power generation system can be shortened, protecting an apparatus.
Further, in this way, the flow rate control means, at the time of starting the combined cycle power generation system, in a normal operation mode in which the shaft output is increased at a specified rate of change, and in a range where the shaft output does not exceed the specified maximum shaft output, Since one of the rapid start modes for increasing the gas turbine output at a predetermined rate of change is made selectable, an appropriate mode can be selected and used according to the situation.

In the gas turbine operation control apparatus, the flow rate control means includes a flow rate adjusting valve configured to match an actual gas turbine output with a gas turbine output command value set based on the predetermined rate of change of the gas turbine output. A first controller for calculating a control amount may be provided, and the gain used by the first controller may be set to a larger value in the quick start mode than in the normal operation mode. .

  Thus, in the quick start mode, the gain of the first controller is set to be larger than that in the normal operation mode, so that the gas turbine output follows the command value and the start time of the combined cycle power generation system is set. It can be shortened.

  In the gas turbine operation control apparatus, the flow rate control means calculates a control amount of the flow rate control valve for making the rotation speed of the gas turbine coincide with a rotation speed command value set based on a predetermined change rate. A second controller; and a low value selection means for inputting a control amount from the first controller and a control amount from the second controller and selecting any one of the smaller control amounts; The apparatus may set the rate of change used in the quick start mode to a value larger than the rate of change used in the normal operation mode.

  As described above, the flow rate control means calculates the control amount of the flow rate control valve for making the rotation speed of the gas turbine coincide with the rotation speed command value set based on the predetermined change rate, and the second controller A control amount from one controller and a control amount from the second controller are input, and low value selection means for selecting one of the smaller control amounts is provided. The second controller uses a change rate used in the quick start mode. Is set to a value larger than the rate of change used in the normal operation mode. As a result, in the quick start mode, the rotational speed can be made to follow the rotational speed command value, and the time required for the acceleration can be shortened.

  In the gas turbine operation control apparatus, the flow rate control means includes a third controller that calculates a control amount of the flow rate control valve for causing the exhaust gas temperature to coincide with a predetermined exhaust gas temperature set value, and the first controller A control value from the second controller, a control value from the third controller, and a low value selection means for selecting any smaller control quantity, the low value selection means comprising: In the quick start mode, a control amount from the first controller or the second controller may be selected.

  Thus, the low value selection means does not select the control amount from the third controller, that is, the control amount based on the exhaust gas temperature in the quick start mode. Thus, at the time of start-up when the rotation speed of the gas turbine increases, it is possible to avoid the start-up stagnation due to the temperature control during the start-up by not performing the control based on the exhaust gas temperature.

  In the gas turbine operation control apparatus, the fuel flow path for supplying fuel to the combustor includes a pressure adjustment valve provided on the upstream side of the flow rate adjustment valve, and a pressure control means for controlling the pressure adjustment valve. The pressure control means includes a fourth controller for calculating a control amount of the pressure control valve for making the fuel pressure supplied to the combustor coincide with a target fuel pressure, and the gain used by the fourth controller May be set to a larger value in the quick start mode than in the normal operation mode.

  Thus, the pressure control valve for controlling the pressure of the fuel provided upstream of the flow rate control valve and the pressure control means for controlling the pressure control valve are provided, and the pressure control means is a pressure of the fuel supplied to the combustor. Is provided with a fourth controller that calculates a control amount that matches the target fuel pressure. The gain used for the fourth controller is set larger in the quick start mode than in the normal operation mode. Thereby, the pressure is made to follow the target fuel pressure value in the quick start mode.

The present invention has a gas turbine, a steam turbine, and a generator arranged on one shaft, a combustor for supplying combustion gas to the gas turbine, and a flow rate adjusting valve provided in a fuel flow path for supplying fuel to the combustor. A gas turbine operation control method for a single-shaft combined cycle power generation system comprising a normal operation mode in which the shaft output is increased at a specified rate of change at startup, and a range in which the shaft output does not exceed a specified maximum shaft output Thus, there is provided a gas turbine operation control method having a rapid start mode in which the gas turbine output is increased at a predetermined rate of change, and one of them can be selected when starting the combined cycle power generation system .

The present invention includes a combustor that combines a gas turbine, a steam turbine, and a generator, and that supplies combustion gas to the gas turbine, and a flow rate adjustment valve that is provided in a fuel flow path that supplies fuel to the combustor. A gas turbine operation control method for a combined cycle power generation system, in which a normal operation mode in which the shaft output is increased at a specified rate of change at startup, and the gas turbine output within a range where the shaft output does not exceed the specified maximum shaft output the and a rapid startup mode Ru is increased at a predetermined rate which is determined according to the load zone, the at the time of startup of the combined cycle power generation system, either one selectable and has been that the gas turbine operation control method I will provide a.

  According to the present invention, there is an effect that the start-up time of the combined cycle power generation system is shortened.

  Hereinafter, an embodiment of a gas turbine operation control device of a combined cycle power generation system according to the present invention will be described with reference to the drawings. In the present embodiment, an example in which the gas turbine operation control device is applied to a single-shaft combined cycle power generation system will be described. However, the present invention is not limited to a single-shaft type, and a gas turbine and a steam turbine are connected to different shafts. It can also be applied to multi-shaft combined cycle power generation systems.

[First Embodiment]
FIG. 1 is a block diagram showing a schematic configuration of a uniaxial combined cycle power generation system 100 according to the present embodiment.
The single-shaft combined cycle power generation system includes a combustor 11 that supplies combustion gas to a gas turbine, a flow rate adjustment valve 10 that is provided in a fuel flow path that supplies fuel to the combustor, and a gas turbine operation control that controls the operation of the gas turbine. The apparatus 50, the compressor 1, the condenser 7, the condensate pump 8, the exhaust heat recovery boiler 9, and the steam control valve 12 are provided. A pipe for supplying air or the like to the compressor 1 has a compressor inlet guide vane adjusting valve (IGV adjusting valve) 2 for controlling the angle of the compressor inlet guide vane for adjusting the flow rate of the working fluid such as air. Is provided. Moreover, the gas turbine 3, the steam turbine 6, and the generator 5 are arrange | positioned at 1 axis | shaft.

  In such a configuration, the combustor 11 is supplied with the compressed air compressed by the compressor 1 and the fuel whose flow rate is adjusted by the flow rate adjusting valve 10, and these are mixed and burned to generate combustion gas. . This combustion gas flows into the gas turbine 3 and acts as power for turning the gas turbine 3. Thereby, the rotational force of the gas turbine 3 is transmitted to the generator 5, and the generator 5 generates electric power.

  The combustion gas after performing work in the gas turbine 3 is led as exhaust gas to the exhaust heat recovery boiler 9 downstream thereof, and is discharged into the atmosphere via a chimney (not shown). In the exhaust heat recovery boiler 9, heat is recovered from the exhaust gas, and steam is generated by water supplied from the condensate pump 8. The steam passes through the steam control valve 12 and is guided to the steam turbine 6. The steam guided to the steam turbine 6 rotates the steam turbine 6. The rotational force of this steam turbine is transmitted to the generator 5, and the generator 5 generates electricity.

The steam turbine 6 performs expansion work with the steam supplied from the exhaust heat recovery boiler 9 to drive the generator 5, and simultaneously supplies the steam that has completed the expansion work to the condenser 7 through the flow path.
The condenser 7 condenses the steam supplied from the steam turbine 6 and condenses it. This condensate flows through a flow path by a condensate pump and is supplied to the exhaust heat recovery boiler 9. This condensate is required when generating steam in the exhaust heat recovery boiler 9.

The gas turbine operation control device 50 includes a flow control unit (flow control unit) 20 and a pressure control unit (pressure control unit) 15.
The flow rate control unit 20 acquires state quantities relating to the operation state and temperature state of the gas turbine as input signals, and a fuel flow rate command (CSO) for controlling the flow rate of fuel supplied to the combustor 11 based on these input signals. Is calculated. Examples of the state quantity related to the operation state include the output of the gas turbine 3 and the rotational speed. Moreover, as a state quantity regarding a temperature state, exhaust gas temperature is mentioned as an example, for example.

  The flow rate controller 20 includes a first controller 21, a second controller 22, a third controller 23, and a low value selection unit (low value selection means) 24. For example, the first controller includes a load limit control circuit, the second controller includes a fuel limit control circuit, and the third controller includes an exhaust gas circuit and a blade path circuit. Moreover, the flow control unit 20 has a quick start mode and a normal operation mode, and can be appropriately switched according to the operation state of the combined cycle power generation system.

  In the quick start mode, the first controller 21 is configured to match the gas turbine output with a gas turbine output command set based on a constant change rate within a range in which the shaft output does not exceed the specified maximum shaft output. Calculate the control amount of the flow control valve.

  Specifically, the first controller 21 includes a command value setting unit 211, a subtractor 212, an output limiting unit 213, and a PI controller 214. In the quick start mode, the first controller 21 sets the gas turbine output command value in the command value setting unit 211 based on the gas turbine output and a constant change rate. Next, the subtractor 212 compares the actual gas turbine output value with the gas turbine output command value calculated by the change rate limiting unit 211 in the previous stage, and outputs the difference to the output limiting unit 213. The output limiting unit 213 performs correction so that the gas turbine output value obtained by the difference does not exceed the maximum shaft output. In the PI controller 214, a control amount is calculated by proportional integral (PI) calculation so as to follow the gas turbine output command value corrected by the output limiting unit 213, and the result is obtained as a first control signal (first Control amount from controller).

  In the normal operation mode, the first controller 21 controls the rate of increase in shaft output at a constant rate of change. In this case, the command value setting unit 211 sets the shaft output command value based on the shaft output and a constant rate of change, and the subtractor 212 calculates the difference between the shaft output command value and the actual shaft output. Based on the above, the first control signal is calculated by the output limiting unit 213 and the PI controller 214.

FIG. 5 shows changes in the gas turbine output GT, the steam turbine output ST, and the shaft output TOTAL when the combined cycle power generation system is started by controlling the shaft output. In FIG. 5, the horizontal axis indicates time, and the vertical axis indicates output. FIG. 2 shows changes in the gas turbine output GT, the steam turbine output ST, and the shaft output TOTAL when starting the combined cycle power generation system by controlling the gas turbine output. In FIG. 2, the horizontal axis indicates time, and the vertical axis indicates output.
As shown in FIG. 2, the first controller 21 is shown in FIG. 5 in order to start up by controlling the rate of increase of the gas turbine output without sequentially limiting the shaft output in the rapid start mode. Compared with the case where the shaft output is started with constant control, the starting time can be shortened.

  Note that the gain of the PI controller 214 used by the first controller may be set larger in the quick start mode than in the normal operation mode. Thus, the command value followability of the gas turbine output is improved by increasing the gain.

  The second controller 22 acquires the rotational speed of the gas turbine 3 as an input signal, and controls a fuel flow rate so as to match the rotational speed and the rotational speed command value (from the second controller). Control amount).

  Specifically, the second controller 22 includes a speed increase rate setting unit 221, a subtracter 222, a proportional device 223, and an adder 224. The acceleration rate setting unit 221 sets the rotation speed command value based on a predetermined acceleration rate. The subtractor 222 compares the rotational speed command value with the actual rotational speed and outputs the difference to the proportional device 223. The gain is set by the proportional device 223, and the speed increase control is performed by the adder 224. The control amount calculated in this way is output to the low value selection unit 24 as the second control signal.

  The third controller 23 acquires the exhaust gas temperature as an input signal, and calculates the control amount of the fuel flow rate so that the exhaust gas temperature does not exceed the exhaust gas temperature upper limit value.

  The third controller 23 includes a subtracter 231 and a PI controller 232. The subtractor 231 calculates the difference between the exhaust gas temperature in the exhaust heat recovery boiler 9 and the target exhaust gas temperature command value. Based on this difference, the PI controller 232 performs a proportional integration (PI) calculation to calculate a control amount of the exhaust gas temperature. The control amount of the exhaust gas temperature obtained here is output to the low value selector 24 as a third control signal.

The first control signal calculated by the first controller 21, the second control signal calculated by the second controller 22, and the third control signal calculated by the third controller 23 are shown in FIG. As shown in FIG.
The low value selection unit 24 selects the control signal having the lowest value among the control signals, and outputs the selected value to the flow rate control valve 10 as the fuel flow rate command CSO.

  In this way, the flow rate control unit 20 outputs the calculated fuel control signal CSO to the flow rate adjustment valve 10 and adjusts the opening degree based on the fuel control signal CSO. As a result, an optimal flow rate of fuel is supplied to the combustor 11.

  The pressure control unit 15 includes a fourth controller 25. The fourth controller 25 calculates a control amount of the pressure control valve for making the fuel pressure supplied to the combustor coincide with the target fuel pressure. Specifically, the fourth controller 25 includes a subtracter 251 and a PI controller 252. The subtractor 251 calculates the difference between the pressure in the fuel flow path and the target fuel pressure that is the target fuel pressure. Based on this difference, the PI controller 252 performs a proportional integration (PI) calculation to calculate a control amount of the fuel pressure.

  The pressure regulating valve 14 is provided on the upstream side of the flow regulating valve 10 in the fuel flow path for supplying fuel to the combustor, and controls the pressure applied to the flow based on the control amount output from the fourth controller 25.

  Note that the gain of the PI controller 252 included in the fourth controller 25 of the pressure control unit 15 may be set larger in the quick start mode than in the normal operation mode. Thereby, the followability of the target fuel pressure is improved in the quick start mode.

  As described above, according to the gas turbine operation control device of the single-shaft combined cycle power generation system according to the present embodiment, the flow rate control unit 20 generates a shaft output at the time of startup in the rapid start mode of the combined cycle power generation system. The gas turbine output is increased at a constant rate within a range not exceeding the specified maximum shaft output. In this way, at startup, the gas turbine output is increased at a constant rate within a range that does not exceed the maximum shaft output. Therefore, the gas turbine output can be increased more quickly than in the conventional method in which the shaft output is increased at a constant rate. It is possible to raise it. As a result, the shaft output can be quickly increased, and the startup time of the combined cycle power generation system can be shortened.

[Modification]
In the gas turbine operation control device of the combined cycle power generation system according to the present embodiment, the first controller increases the gas turbine output based on a constant change rate within a range where the shaft output does not exceed the specified maximum shaft output. It was supposed to be made, but is not limited to this.
For example, the first controller may increase the gas turbine output at a rate of change determined according to the load band within a range where the shaft output does not exceed a prescribed maximum shaft output. Moreover, each change rate according to a load zone is determined from the restrictions of each apparatus which comprises a combined cycle power generation system. Moreover, the restrictions of each apparatus are the clearance of a gas turbine output, and the thermal stress of a steam turbine output, for example.

  FIG. 3 is a diagram showing time on the horizontal axis and the output value ST of the steam turbine, the output value GT of the gas turbine, and the shaft output TOTAL on the vertical axis, and shows the rate of change determined according to the load band. . For example, an increase rate 1 indicates a low load zone, and an increase rate 2 indicates a change rate of a medium load zone. Thus, for example, in the case of a low load zone, the gas turbine output is made higher than in the case of a medium load zone. Thereby, it is possible to shorten the start-up time of the combined cycle power generation system and to protect the device as compared with the case where the rate of increase in the high load range is uniformly used in the entire load range.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The combined cycle power generation system of the present embodiment is different from the first embodiment in that the change rate of the rotation speed of the gas turbine of the second controller is higher than the change rate used in the normal operation mode when in the rapid start mode. Is also set to a large value. Further, the third controller includes a switching unit 233, and in the rapid start mode, the value selected by the switching unit is input to the low value selection unit 24. Hereinafter, regarding the gas turbine operation control device of the combined cycle power generation system of the present embodiment, description of points that are common to the first embodiment will be omitted, and different points will be mainly described.

  When the second controller 22 'is in the quick start mode, the change rate used in the second controller is set to a change rate determined according to the load band, and the rate of increase in speed is increased as much as possible.

  The third controller 23 ′ includes a switching unit 233. In the quick start mode, the third controller 23 ′ outputs the value selected by the switching unit 233 to the low value selection unit 24. The value selected by the switching unit 233 is a very large value such as infinity. Further, the value selected by the switching unit 233 may be a value larger than the control amount output from the first controller 21 and the second controller 22 ′.

  The low value selection unit 24 selects the smallest one of the input control amounts in the quick start mode. Moreover, the control amount acquired from 3rd controller 23 'is set larger than the control amount acquired from 1st controller 21 and 2nd controller 22' by the front | former stage. Thereby, even if the three control amounts are compared, one of the first control unit 21 and the second control unit 22 ′ is used.

  As described above, when the second controller is in the quick start mode, the rate of change in the rotational speed of the gas turbine is set to a value larger than the rate of change used in the normal operation mode, and the rate of increase in the gas turbine speed is set. Increase as much as possible according to the rate of change according to the load zone. The second controller outputs the control amount thus obtained to the low value selection unit 24. Further, the third controller outputs a large value that is not selected by the low value selection unit 24 by the low value selection to the low value selection unit 24 in the quick start mode. As a result, the low value selection unit 24 selects either one of the control amounts from the first controller or the second controller. Generally, when the rotational speed of the gas turbine increases (when the rate of increase by the second controller increases), the exhaust gas temperature of the exhaust heat recovery boiler 9 connected to the steam turbine 6 increases, and the normal operation mode There is a possibility of exceeding the preset exhaust gas temperature. Then, in the combined cycle power generation system, there is a possibility that start-up stagnation due to temperature limitation may occur. Considering this, in the gas turbine operation control apparatus in the present embodiment, when the second controller increases the rate of increase in the rapid mode, temperature control by the third controller is not performed. In other words, the low value selection unit selects a smaller control amount from among the control amounts from the first controller and the second controller. As a result, the rotational speed can be made to follow the rotational speed command value in the rapid start mode, the speed increase rate can be increased, and the start-up time of the combined cycle power generation system can be shortened.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

1 is a block diagram showing an outline of a combined cycle power generation system according to a first embodiment of the present invention. It is the figure which showed the time concerning starting at the time of controlling the rate of increase of gas turbine output. It is not shown how long it takes to start up when the gas turbine output is increased at a rate of change corresponding to the load zone. It is the block diagram which showed the outline of the combined cycle power generation system which concerns on the 2nd Embodiment of this invention. It is the figure which showed the time concerning starting at the time of controlling the rate of increase of shaft output.

Explanation of symbols

1 Compressor 3 Gas Turbine 6 Steam Turbine 10 Flow Control Valve 11 Combustor 14 Pressure Control Valve 15 Pressure Control Unit 20 Flow Control Unit 21 First Controller 22 Second Controller 23 Third Controller 24 Low Value Selection Unit 25 First 4 Controller 50 Gas Turbine Operation Control Unit 211 Command Value Setting Units 212, 222, 231, 251 Subtractor 213 Output Limiting Units 214, 232, 252 PI Controller 221 Speed Increase Rate Setting Unit 223 Proportional Device 224 Adder 225 Function Generator CSO Fuel control signal

Claims (8)

A gas turbine, a steam turbine, and a generator are arranged on one axis, a combustor that supplies combustion gas to the gas turbine, a flow rate adjustment valve that is provided in a fuel flow path that supplies fuel to the combustor, and the flow rate A gas turbine operation control device of a single-shaft combined cycle power generation system comprising a flow rate control means for controlling a regulating valve,
The flow rate control means includes a normal operation mode in which the shaft output is increased at a specified rate of change when starting the single shaft combined cycle power generation system, and a gas turbine output within a range in which the shaft output does not exceed a specified maximum shaft output. A gas turbine operation control device characterized by having a rapid start mode for increasing the power at a predetermined rate of change, and one of them can be selected when starting the combined cycle power generation system . Combining a gas turbine, a steam turbine, and a generator, a combustor for supplying combustion gas to the gas turbine, a flow rate adjusting valve provided in a fuel flow path for supplying fuel to the combustor, and the flow rate adjusting valve A combined cycle power generation system gas turbine operation control device comprising a flow rate control means for controlling,
The flow rate control means loads the gas turbine output within a normal operation mode in which the shaft output is increased at a specified rate of change and the shaft output does not exceed the specified maximum shaft output when the combined cycle power generation system is started. and a predetermined rapid startup mode Ru increase in rate of change is determined according to the band, the gas turbine at the time of startup of the combined cycle power generation system, characterized in that either there is a selectable Operation control device. The flow rate control means is
A first controller for calculating a control amount of the flow rate control valve for making an actual gas turbine output coincide with a gas turbine output command value set based on the predetermined rate of change of the gas turbine output;
3. The gas according to claim 1, wherein the gain used by the first controller is set to a larger value in the quick start mode than in the normal operation mode. Turbine operation control device. The flow rate control means is
A second controller for calculating a control amount of the flow rate control valve for making the rotational speed of the gas turbine coincide with a rotational speed command value set based on a predetermined change rate;
A control value from the first controller and a control value from the second controller are input, and comprises a low value selection means for selecting any smaller control amount,
The gas turbine operation control device according to claim 3 , wherein the second controller sets the change rate used in the quick start mode to a value larger than the change rate used in the normal operation mode. The flow rate control means is
A third controller that calculates a control amount of the flow rate control valve for making the exhaust gas temperature coincide with a predetermined exhaust gas temperature set value, and outputs the control amount to the low value selection means;
The gas turbine operation control device according to claim 4 , wherein the low value selection means selects a control amount from the first controller or the second controller in the quick start mode. In a fuel flow path for supplying fuel to the combustor, a pressure regulating valve provided on the upstream side of the flow regulating valve;
Pressure control means for controlling the pressure regulating valve,
The pressure control means includes a fourth controller that calculates a control amount of the pressure control valve for making the fuel pressure supplied to the combustor coincide with a target fuel pressure,
Gain fourth controller is used, the person in the case of the quick start mode, according to claims 1, characterized in that it is set to a value larger than the normal operation mode to claim 5 Gas turbine operation control device. A uniaxial shaft comprising a gas turbine, a steam turbine, and a generator arranged on one axis, a combustor for supplying combustion gas to the gas turbine, and a flow rate adjusting valve provided in a fuel flow path for supplying fuel to the combustor. A gas turbine operation control method for a combined cycle power generation system,
During startup, there are a normal operation mode in which the shaft output is increased at a specified rate of change, and a quick start mode in which the gas turbine output is increased at a specified rate of change within a range where the shaft output does not exceed the specified maximum shaft output. And the gas turbine operation control method in which either one is made selectable at the time of starting of the combined cycle power generation system . A combined cycle power generation system comprising a combustor that combines a gas turbine, a steam turbine, and a generator and supplies combustion gas to the gas turbine, and a flow rate adjustment valve provided in a fuel flow path that supplies fuel to the combustor. The gas turbine operation control method of
At the time of start-up, normal operation mode in which the shaft output is increased at a specified rate of change, and within a range where the shaft output does not exceed the specified maximum shaft output, the gas turbine output is at a predetermined rate of change determined according to the load band. and a rapid startup mode Ru increases, the at the time of startup of the combined cycle power generation system, either one selectable and has been that the gas turbine operation control method.

Images