CN116753041A - Method and device for controlling opening degree of inlet guide vane of gas turbine - Google Patents
Method and device for controlling opening degree of inlet guide vane of gas turbine Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 43
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- 238000010248 power generation Methods 0.000 claims description 53
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- 238000004590 computer program Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 95
- 230000001276 controlling effect Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 14
- 101150109471 PID2 gene Proteins 0.000 description 7
- 101100190466 Caenorhabditis elegans pid-3 gene Proteins 0.000 description 6
- 101000609957 Homo sapiens PTB-containing, cubilin and LRP1-interacting protein Proteins 0.000 description 6
- 102100039157 PTB-containing, cubilin and LRP1-interacting protein Human genes 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
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- 239000000463 material Substances 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/16—Control of working fluid flow
- F02C9/20—Control of working fluid flow by throttling; by adjusting vanes
- F02C9/22—Control of working fluid flow by throttling; by adjusting vanes by adjusting turbine vanes
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Turbines (AREA)
Abstract
The application provides a method and a device for controlling the opening degree of an inlet guide vane of a gas turbine, and relates to the technical field of gas turbine control. The method comprises the following steps: acquiring a temperature difference value between an exhaust temperature reference value and an exhaust temperature value; the temperature difference value is input into a plurality of controllers to obtain output values corresponding to the controllers respectively; determining a current load working point of the gas turbine, and determining weight coefficients corresponding to the controllers according to the current load working point; weighting the output values corresponding to the controllers based on the weight coefficients corresponding to the controllers respectively to obtain a plurality of weighted output values; and generating an inlet guide vane opening control instruction according to the weighted output values, and controlling the opening of the inlet guide vane of the gas turbine based on the inlet guide vane opening control instruction. According to the application, different weights can be given to the outputs of the controllers under different load working conditions, so that the opening degree of the inlet guide vane is accurately controlled, and the generating efficiency of the unit is improved.
Description
Technical Field
The application relates to the technical field of gas turbine control, in particular to a method and a device for controlling the opening degree of an inlet guide vane of a gas turbine.
Background
The combined cycle power generation of the gas turbine is used as a power generation mode with high reliability, little pollution and strong flexibility, and has been developed at a high speed in recent years. The gas turbine mainly comprises a gas compressor, a combustion chamber and a turbine, and the main regulation modes are as follows: 1) Regulating the flow of fuel involved in combustion; 2) And (3) adjusting the opening degree of an Inlet Guide Vane (IGV) of the compressor, and changing the air flow entering the compressor. The main function of IGV opening control is to prevent compressor surge and control the gas turbine exhaust temperature at the optimum operating point of the exhaust-heat boiler to achieve higher combined cycle efficiency. In the related art, there is a method of adjusting the IGV opening degree by the gas turbine power generation or by using only a single PID controller. However, as the running time increases, the working conditions of the unit change, etc., the characteristics of the unit change gradually, and the control effect of the traditional IGV opening control method decreases, so that it is difficult to quickly and accurately control the exhaust temperature at the optimal working point of the waste heat boiler, resulting in a decrease in the power generation efficiency of the combined cycle unit.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent.
To this end, a first aspect of the present application proposes a method for controlling an opening degree of an inlet guide vane of a gas turbine, comprising:
obtaining an exhaust temperature reference value and an exhaust temperature value of a gas turbine, and obtaining a temperature difference value between the exhaust temperature reference value and the exhaust temperature value;
inputting the temperature difference value into a plurality of controllers to obtain output values corresponding to the controllers, wherein parameters in the controllers are obtained by setting at different standard load working condition points;
determining a current load working condition point of the gas turbine, and determining weight coefficients corresponding to the controllers according to the current load working condition point;
weighting the output values corresponding to the controllers based on the weight coefficients corresponding to the controllers respectively to obtain a plurality of weighted output values;
and generating an inlet guide vane opening control instruction according to the weighted output values, and controlling the opening of the inlet guide vane of the gas turbine based on the inlet guide vane opening control instruction.
In some embodiments of the application, the plurality of controllers includes a first controller, a second controller, and a third controller; the parameter in the first controller is at a first standard load working point L 1 Setting to obtain the parameters in the second controller at a second standard load working condition point L 2 Setting to obtain the parameters in the third controller at a third standard load working condition point L 3 Setting to obtain, L 1 ＜L 2 ＜L 3 ≤100％。
In some embodiments of the present application, the weight coefficients corresponding to the controllers are determined according to the current load operating point through the following formulas;
λ 1 、λ 2 、λ 3 all limited by 0 to 1
Wherein L is the current load working condition point, lambda 1 For the weight coefficient lambda corresponding to the first controller 2 For the weight coefficient lambda corresponding to the second controller 3 For the third controller pairAnd (5) a weight coefficient. In some embodiments of the application, the generating the inlet guide vane opening control command according to the plurality of weighted output values includes: determining a current power generation load set value and a feedforward correction function of the power generation load set value on the opening degree of the inlet guide vane of the gas turbine; obtaining a first correction value according to the current power generation load set value and a feedforward correction function of the power generation load set value on the opening of the inlet guide vane; and generating an inlet guide vane opening control instruction according to the weighted output values and the first correction value.
In some embodiments of the present application, the generating the inlet guide vane opening control command according to the plurality of weighted output values and the first correction value includes: when the gas turbine is in load reduction operation, performing gain processing on the first correction value to obtain a second correction value; and generating an inlet guide vane opening control instruction according to the weighted output values and the second correction value.
In some embodiments of the present application, the obtaining the first correction value according to the current power generation load set value and the feedforward correction function of the power generation load set value on the opening degree of the inlet guide vane includes: acquiring an inlet pressure value and an inlet temperature value of the air compressor; determining a first correction function of the compressor inlet pressure to the power generation load set value and a second correction function of the compressor inlet temperature and the compressor inlet temperature to the power generation load set value; correcting the current power generation load set value according to the compressor inlet pressure value, the compressor inlet temperature value, the first correction function and the second correction function to obtain a third correction value; and obtaining a first correction value according to the third correction value and the feedforward correction function.
The second aspect of the present application proposes a gas turbine inlet guide vane opening control device, comprising:
the first calculation module is used for obtaining an exhaust temperature reference value and an exhaust temperature value of the gas turbine and obtaining a temperature difference value between the exhaust temperature reference value and the exhaust temperature value;
the second calculation module is used for inputting the temperature difference value into a plurality of controllers to obtain output values corresponding to the controllers, wherein parameters in the controllers are obtained by setting at different standard load working condition points;
the determining module is used for determining a current load working condition point of the gas turbine and determining weight coefficients corresponding to the controllers according to the current load working condition point;
the processing module is used for respectively carrying out weighting processing on the output values corresponding to the controllers based on the weight coefficients corresponding to the controllers so as to obtain a plurality of weighted output values;
and the control module is used for generating an inlet guide vane opening control instruction according to the weighted output values and controlling the opening of the inlet guide vane of the gas turbine based on the inlet guide vane opening control instruction.
In some embodiments of the application, the plurality of controllers includes a first controller, a second controller, and a third controller; the parameter in the first controller is at a first standard load working point L 1 Setting to obtain the parameters in the second controller at a second standard load working condition point L 2 Setting to obtain the parameters in the third controller at a third standard load working condition point L 3 Setting to obtain, L 1 ＜L 2 ＜L 3 ≤100％。
In some embodiments of the present application, the determining module determines the weight coefficients corresponding to the plurality of controllers according to the current load operating point by the following formula:
λ 1 、λ 2 、λ 3 all limited by 0 to 1
Wherein L is the current load working condition point, lambda 1 For the weight coefficient lambda corresponding to the first controller 2 For the weight coefficient lambda corresponding to the second controller 3 And the weight coefficient corresponding to the third controller.
A third aspect of the application proposes a control device for inlet guide vanes of a gas turbine, comprising a memory, a processor and a computer program stored on said memory and executable on said processor, characterized in that said processor implements the method according to the first aspect described above when executing said program.
According to the gas turbine inlet guide vane opening control method provided by the embodiment of the application, the multi-loop controller control of the exhaust temperature is designed, different weights are given to the outputs of the controllers under different load working conditions, and the gas turbine can accurately control the inlet guide vane opening under different load working conditions, so that the gas turbine combined cycle unit is positioned at the optimal working point, and the generating efficiency of the unit is improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic flow chart of a method for controlling the opening of inlet guide vanes of a gas turbine according to an embodiment of the present application;
FIG. 2 is a flow chart of another method for controlling inlet guide vane opening of a gas turbine according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a gas turbine inlet guide vane opening control logic provided by an embodiment of the present application;
fig. 4 is a logic schematic diagram of obtaining weight coefficients corresponding to each of the controllers according to an embodiment of the present application;
FIG. 5 is a graph schematically illustrating the relationship between the weight coefficients corresponding to each of the plurality of controllers and the current load operating point of the gas turbine according to the embodiment of the present application;
FIG. 6 is a flow chart of yet another method for controlling inlet guide vane opening of a gas turbine according to an embodiment of the present application;
FIG. 7 is a schematic diagram of another gas turbine inlet guide vane opening control logic provided in an embodiment of the present application;
FIG. 8 is a schematic diagram of a gas turbine inlet guide vane opening control device according to an embodiment of the present application;
FIG. 9 is a block diagram of a control device for inlet guide vanes of a gas turbine according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
The application provides a method and a device for controlling the opening degree of an inlet guide vane of a gas turbine. Specifically, a method and an apparatus for controlling the opening degree of an inlet guide vane of a gas turbine according to embodiments of the present application are described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for controlling opening of inlet guide vanes of a gas turbine according to an embodiment of the present application. As shown in fig. 1, the gas turbine inlet guide vane opening control method includes the steps of:
step 101, obtaining an exhaust temperature reference value and an exhaust temperature value of the gas turbine, and obtaining a temperature difference value between the exhaust temperature reference value and the exhaust temperature value.
As an example, the gas turbine may be an M701F4 type gas turbine. The exhaust gas temperature value may be obtained by a sensor (e.g., thermocouple) that measures the exhaust gas temperature, for example, an average value of a plurality of sensor measurements that measure the exhaust gas temperature is taken as the exhaust gas temperature value.
Alternatively, in some embodiments of the present application, when the temperature difference value between the exhaust temperature reference value and the exhaust temperature value is obtained, the difference value between the exhaust temperature reference value and the exhaust temperature value may be calculated in advance after subtracting the preset temperature, and be taken as the temperature difference value. For example, the preset temperature may be set to 15 ℃, and the exhaust temperature reference value is subtracted by 15 ℃ and then is different from the exhaust temperature value, so that the exhaust temperature can be controlled to be 15 ℃ below the temperature control line (i.e. the exhaust temperature reference value), a certain safety margin is maintained, and the overtemperature caused by factors such as load fluctuation is avoided.
And 102, inputting the temperature difference value into a plurality of controllers to obtain output values corresponding to the controllers, wherein parameters in the controllers are set at different standard load working condition points.
Step 103, determining a current load working condition point of the gas turbine, and determining weight coefficients corresponding to the controllers according to the current load working condition point.
The current load operating point is determined by the current power generation load value and the full load value of the gas turbine, that is, the ratio of the current power generation load value to the full load value of the gas turbine is determined as the current load operating point. In one implementation, the weight coefficients corresponding to the controllers can be given according to the distance between the current load working condition point and the standard load working condition points, so that good IGV opening control effect can be obtained under different load working condition points.
And 104, respectively carrying out weighting processing on the output values corresponding to the controllers based on the weight coefficients corresponding to the controllers to obtain a plurality of weighted output values.
And 105, generating an inlet guide vane opening control instruction according to the weighted output values, and controlling the opening of the inlet guide vane of the gas turbine based on the inlet guide vane opening control instruction.
In one possible implementation, the plurality of weighted output values may be summed, and the summed result is used as the inlet guide vane opening control command IGVCSO.
The method is applied to the gas turbine grid connection with load (for example, 50% to 100% load), and the opening degree of the inlet guide vanes is controlled according to the exhaust temperature.
According to the gas turbine inlet guide vane opening control method provided by the embodiment of the application, the multi-loop controller control of the exhaust temperature is designed, different weights are given to the outputs of the controllers under different load working conditions, so that the gas turbine can accurately control the inlet guide vane opening under different load working conditions, the gas turbine combined cycle unit is positioned at the optimal working point, and the generating efficiency of the unit is improved.
Fig. 2 is a schematic flow chart of another method for controlling the opening of the inlet guide vane of the gas turbine according to the embodiment of the application. As shown in fig. 2, the gas turbine inlet guide vane opening control method includes the steps of:
step 201, obtaining an exhaust temperature reference value and an exhaust temperature value of the gas turbine, and obtaining a temperature difference value between the exhaust temperature reference value and the exhaust temperature value.
Step 202, inputting the temperature difference value to a first controller, a second controller and a third controller to obtain output values corresponding to the first controller, the second controller and the third controller respectively; the parameters in the first controller are at a first standard load operating point L 1 Setting the parameters in the second controller at a second standard load working point L 2 Setting the parameters in the third controller at a third standard load working point L 3 Setting to obtain, L 1 ＜L 2 ＜L 3 ≤100％。
As an example, fig. 3 is a schematic diagram of a gas turbine inlet guide vane opening control logic according to an embodiment of the present application. As shown in fig. 3, the multi-loop PID control of the exhaust gas temperature is designed in the logic diagram, and includes a first controller PID1 (3), a second controller PID2 (4), and a third controller PID3 (5). Wherein the first controller PID1 (3), the second controller PID2 (4) and the third controller PID3 (5) are reaction controllers. In addition, fig. 3 further includes: a subtracting unit (1), an inverse fetching unit (2), a weighting processing unit (6, 7 and 8) and an adding unit (9). Wherein EXSET represents an exhaust temperature reference value of the gas turbine, EXAVE represents an exhaust temperature value of the gas turbine, and "15" input to the subtracting unit (1) is a preset temperature. The exhaust temperature reference value EXSET is subtracted by 15 ℃ through a subtracting unit (1) and then is subjected to difference with the exhaust temperature value EXAVE, so that a temperature difference value is obtained.
Step 203, determining a current load working point of the gas turbine, and determining weight coefficients corresponding to the controllers respectively according to the current load working point through a preset formula.
Wherein, the preset formula can refer to formula (1):
wherein L is the current load working condition point, lambda 1 For the weight coefficient lambda corresponding to the first controller 2 For the weight coefficient lambda corresponding to the second controller 3 And the weight coefficient corresponding to the third controller.
Alternatively, in some embodiments of the application, when L 2 At L 1 And L is equal to 3 At the midpoint, there is L 3 -L 2 ＝L 2 -L 1 . Therefore, equation (1) can be simplified to equation (2).
Taking actual application into consideration, in the embodiment of the application, 50% of common working condition points are taken as examples, and 50% is taken as a first standard load working condition point L 1 75% is taken as a second standard load working condition point L 2 100% is taken as a third standard load working condition point L 3 . Under the setting condition of the standard load working condition point, the logic diagram for obtaining the weight coefficient corresponding to each controller can be shown in fig. 4. The logic diagram of fig. 4 includes: a dividing unit (19), subtracting units (20 and 24), a multiplying unit (21), upper and lower clipping units (22, 25 and 27), an absolute value unit (23) and an inverse number taking unit (26). Where LOAD represents a current power generation LOAD value of the gas turbine, FULL LOAD represents a FULL LOAD value of the gas turbine,representing the current load operating point L of the gas turbine.
In the embodiment shown in FIG. 4, at the current load operating point L.ltoreq.L 1 At the first standard load working pointL 1 Setting the obtained weight coefficient lambda of PID1 1 Weight coefficient lambda of 1, PID2 2 And the weight coefficient lambda of PID3 3 Is 0; at the current load operating point L at L 1 And L is equal to 2 Lambda is at the time of 1 Gradually decrease at a second standard load operating point L 2 Setting the obtained weight coefficient lambda of PID2 2 Gradually increasing; when l=l 2 Lambda is at the time 1 Reduced to 0, lambda 2 Increased to 1; when L is L 2 And L is equal to 3 Lambda is at the time of 2 Gradually decrease at standard load operating point L 3 Setting the obtained weight coefficient lambda of PID3 3 Gradually increasing; when l=l 3 Lambda is at the time 2 Reduced to 0, lambda 3 Increased to 1; when L is greater than or equal to L 3 Lambda is at the time 3 Weight coefficient lambda of 1, PID1 1 And the weight coefficient lambda of PID2 2 Is 0. For any load operating point, there are: lambda (lambda) 1 +λ 2 +λ 3 =1. Wherein lambda is 1 、λ 2 And lambda (lambda) 3 Reference is made to FIG. 5 for a graph of the current load operating point of the gas turbine.
And 204, respectively carrying out weighting processing on the output values corresponding to the controllers based on the weight coefficients corresponding to the controllers to obtain a plurality of weighted output values.
Step 205, generating an inlet guide vane opening control instruction according to the weighted output values, and controlling the opening of the inlet guide vane of the gas turbine based on the inlet guide vane opening control instruction.
In the embodiment of the present application, step 201 and step 204 to step 205 may be implemented by any one of the modes of each embodiment of the present application, which is not specifically limited and will not be described herein.
According to the gas turbine inlet guide vane opening control method, the multi-loop controller control of the exhaust temperature is designed, when the gas turbine is in any load working condition, different weights can be given to the three PID controllers according to the distance between the current load working condition and the standard load working condition point, good inlet guide vane opening control effect can be achieved under different load working condition points of the gas turbine, the accuracy of the inlet guide vane opening is further improved, the gas turbine combined cycle unit is located at the optimal working point, and the generating efficiency of the unit is improved.
FIG. 6 is a flow chart of a method for controlling inlet guide vane opening of a gas turbine according to an embodiment of the present application. As shown in fig. 6, the gas turbine inlet guide vane opening degree control method includes the steps of:
step 601, obtaining an exhaust temperature reference value and an exhaust temperature value of the gas turbine, and obtaining a temperature difference value between the exhaust temperature reference value and the exhaust temperature value.
Step 602, inputting the temperature difference value to a plurality of controllers to obtain output values corresponding to the controllers, wherein parameters in the controllers are set at different standard load working condition points.
Step 603, determining a current load working point of the gas turbine, and determining weight coefficients corresponding to the controllers according to the current load working point.
In step 604, weighting processing is performed on the output values corresponding to the controllers based on the weight coefficients corresponding to the controllers, respectively, so as to obtain a plurality of weighted output values.
Step 605, determining a current power generation load set point and a feedforward correction function of the power generation load set point on the inlet guide vane opening.
The current power generation load set value of the gas turbine is the power generation load expected value of the gas turbine, and can be calculated by the coordination control system according to a unit load instruction issued by a power grid.
Step 606, obtaining a first correction value according to the current power generation load set value and a feedforward correction function of the power generation load set value on the opening degree of the inlet guide vane.
That is, in the embodiment of the present application, feedforward control of the power generation load set value is also introduced on the basis of the exhaust temperature feedback control of the inlet guide vane opening. FIG. 7 is a schematic diagram of another gas turbine inlet guide vane opening control logic provided in an embodiment of the present application. As shown in fig. 7, the IGV opening control logic schematic may further include a feedforward correction function (15) of the power generation load setting value to the opening of the inlet guide vane (the feedforward correction function may be provided by a gas turbine manufacturer), and the first correction value is obtained through the feedforward correction function of the current power generation load setting value and the power generation load setting value to the opening of the inlet guide vane, where the first correction value may be understood as an IGV opening command corrected based on the current power generation load setting value. When the load is increased, the PID feedback control adjusts the opening of the IGV after the exhaust temperature is changed, and once the load set value is changed in the feedforward control of the power generation load set value, the opening of the IGV can be adjusted in advance, so that abnormal increase of the exhaust temperature caused by slow action of the IGV is avoided, the temperature control is carried out, and the load carrying capacity of the unit is limited.
As an example, consider the embodiment shown in fig. 7, where the parameters of PID1, PID2, and PID3 are set at 50%, 75%, and 100% standard load operating points, respectively. When the load of the combustion engine is less than 50%, the exhaust temperature is far lower than the temperature control line, the output of each PID controller is the minimum value 0, and the current IGVCSO is calculated by the feedforward of the power generation power set value of the combustion engine, so that the opening of the IGV is kept at the minimum opening. When the load of the gas turbine exceeds 50%, calculating the weight coefficient lambda output by PID1, PID2 and PID3 according to the current load working point of the gas turbine 1 、λ 2 、λ 3 Thereby obtaining the IGVCSO.
Optionally, in some embodiments of the present application, the power generation load set value may be further corrected based on the compressor inlet pressure value and the compressor inlet temperature value, when the atmospheric pressure is reduced or the atmospheric temperature is increased, the specific volume of air is increased, and on the premise that the volumetric flow rate of air sucked by the compressor is unchanged, the mass flow rate is reduced, the output power of the gas turbine is reduced, and the power generation load set value should be corrected in the direction of increasing.
That is, in some embodiments of the present application, the IGV opening degree control logic schematic diagram shown in fig. 7 may further include: the first correction function (11) of the compressor inlet pressure to the power generation load set point, the second correction function (12) of the compressor inlet temperature to the power generation load set point, and multipliers (13 and 14) (the first correction function (11) and the second correction function (12) may be provided by the gas turbine manufacturer). In one possible approachIn an implementation mode, the inlet pressure value P of the compressor can be obtained 1 And the compressor inlet temperature value T 1 . A first correction function (11) of the compressor inlet pressure to the power generation load set point and a second correction function (12) of the compressor inlet temperature and the compressor inlet temperature to the power generation load set point are determined. According to the inlet pressure value P of the compressor 1 Inlet temperature value T of compressor 1 And a first correction function (11) and a second correction function (12) for correcting the current power generation load set value ALRSET to obtain a third correction value. A first correction value is obtained from the third correction value and the feedforward correction function (15).
In step 607, an inlet guide vane opening control command is generated according to the plurality of weighted output values and the first correction value, and the gas turbine inlet guide vane opening is controlled based on the inlet guide vane opening control command.
In some embodiments of the present application, the IGV opening degree control logic schematic diagram shown in fig. 7 may further include: an addition unit (10). An inlet guide vane opening control command ICVCSO is generated by an addition unit (10) from the plurality of weighted output values and the first correction value.
Optionally, in some embodiments of the present application, during load-reducing operation of the gas turbine, the opening degree of the inlet guide vane is reduced in advance, and in order to slow down the reducing amplitude of the opening degree of the inlet guide vane, the first correction value may be further subjected to gain processing to obtain the second correction value. And generating an inlet guide vane opening control instruction according to the weighted output values and the second correction value. As an example, the IGV opening degree control logic schematic shown in fig. 7 may further include: or logic unit (16), analog quantity selecting unit (17) and multiplying unit (18). Wherein SPSET DOWN represents a rotational speed set point reduction signal and LDSET DOWN represents a load set point reduction signal. During load reduction operation of the gas turbine, no matter whether the unit is currently under the rotating speed control or the load control mode, one of the SPSET DOWN and the LDSET DOWN is 1, and 0.5 can be selected as a gain coefficient of the first correction value to slow DOWN the reduction amplitude of the IGV opening, so that the phenomenon that the IGV is too small in advance during load reduction, and the exhaust temperature rises to enter temperature control is avoided.
In the embodiment of the present application, steps 601 to 604 may be implemented in any manner in each embodiment of the present application, which is not specifically limited and not described herein.
According to the gas turbine inlet guide vane opening control method provided by the embodiment of the application, the multi-loop controller control of the exhaust temperature is designed, different weights are given to the outputs of the controllers under different load working conditions, so that the gas turbine can accurately control the inlet guide vane opening under different load working conditions, and the generating efficiency of a unit is improved. In addition, the application introduces feedforward control of the power generation load set value on the basis of exhaust temperature multi-loop feedback control, can adjust the opening of the inlet guide vane in advance before the output power of the combustion engine changes, and avoids the condition that the exhaust temperature rises and enters temperature control in advance due to slow action of the inlet guide vane in the load rising process to a certain extent, thereby maximizing the output of the combined cycle unit.
Fig. 8 is a schematic diagram of a gas turbine inlet guide vane opening control device according to an embodiment of the present application. As shown in fig. 8, the gas turbine inlet guide vane opening degree control device includes: a first calculation module 801, a second calculation module 802, a determination module 803, a processing module 804, and a control module 805. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the first calculation module 801 is configured to obtain an exhaust temperature reference value and an exhaust temperature value of the gas turbine, and obtain a temperature difference value between the exhaust temperature reference value and the exhaust temperature value.
The second calculation module 802 is configured to input the temperature difference value to a plurality of controllers to obtain output values corresponding to the controllers, where parameters in the controllers are set at different standard load working condition points.
The determining module 803 is configured to determine a current load operating point of the gas turbine, and determine weight coefficients corresponding to the plurality of controllers according to the current load operating point.
The processing module 804 is configured to perform weighting processing on the output values corresponding to the multiple controllers respectively based on the weight coefficients corresponding to the multiple controllers respectively, so as to obtain multiple weighted output values.
The control module 805 is configured to generate an inlet guide vane opening control instruction according to the weighted output values, and control the gas turbine inlet guide vane opening based on the inlet guide vane opening control instruction.
In some embodiments of the application, the plurality of controllers includes a first controller, a second controller, and a third controller; the parameters in the first controller are at the first standard load operating point L 1 Setting to obtain the parameters in the second controller at a second standard load working point L 2 Setting to obtain the parameters in the third controller at a third standard load working point L 3 Setting to obtain, L 1 ＜L 2 ＜L 3 ≤100％。
In some embodiments of the present application, the determining module 803 determines the weight coefficients corresponding to each of the plurality of controllers according to the current load operating point by the following formula:
wherein L is the current load working condition point, lambda 1 For the weight coefficient lambda corresponding to the first controller 2 For the weight coefficient lambda corresponding to the second controller 3 And the weight coefficient corresponding to the third controller.
In some embodiments of the application the control module 805 is specifically configured to: determining a current power generation load set value of the gas turbine and a feedforward correction function of the power generation load set value on the opening degree of the inlet guide vane; obtaining a first correction value according to a current power generation load set value and a feedforward correction function of the power generation load set value on the opening of the inlet guide vane; and generating an inlet guide vane opening control instruction according to the weighted output values and the first correction value.
In some embodiments of the present application, the control module 805 is specifically configured to: when the gas turbine is in load reduction operation, performing gain processing on the first correction value to obtain a second correction value; and generating an inlet guide vane opening control instruction according to the weighted output values and the second correction value.
In some embodiments of the application, the gas turbine inlet guide vane opening control device may further include a correction module. The correction module is specifically used for: acquiring an inlet pressure value and an inlet temperature value of the air compressor; determining a first correction function of the inlet pressure of the compressor to the power generation load set value and a second correction function of the inlet temperature of the compressor and the inlet temperature of the compressor to the power generation load set value; correcting the current power generation load set value according to the inlet pressure value of the air compressor, the inlet temperature value of the air compressor, the first correction function and the second correction function to obtain a third correction value; and obtaining the first correction value according to the third correction value and the feedforward correction function.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
In order to realize the embodiment, the application also provides a control device of the gas turbine inlet guide vane. FIG. 9 is a block diagram of a control device for inlet guide vanes of a gas turbine according to an embodiment of the present application. As shown in fig. 9, the control device 900 may include a memory 901, a processor 902, and a computer program 903 stored in the memory 901 and executable on the processor 902, where the processor 902 executes the computer program 903 to perform the method for controlling the opening degree of the inlet guide vane of the gas turbine according to any one of the above embodiments of the present application.
In order to achieve the above embodiments, the present application also proposes a non-transitory computer readable storage medium, which when executed by a processor of the aforementioned control device, enables the aforementioned control device to perform the gas turbine inlet guide vane opening control method according to any of the aforementioned embodiments.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (10)
1. A method for controlling the opening of inlet guide vanes of a gas turbine, comprising:
obtaining an exhaust temperature reference value and an exhaust temperature value of a gas turbine, and obtaining a temperature difference value between the exhaust temperature reference value and the exhaust temperature value;
inputting the temperature difference value into a plurality of controllers to obtain output values corresponding to the controllers, wherein parameters in the controllers are obtained by setting at different standard load working condition points;
determining a current load working condition point of the gas turbine, and determining weight coefficients corresponding to the controllers according to the current load working condition point;
weighting the output values corresponding to the controllers based on the weight coefficients corresponding to the controllers respectively to obtain a plurality of weighted output values;
and generating an inlet guide vane opening control instruction according to the weighted output values, and controlling the opening of the inlet guide vane of the gas turbine based on the inlet guide vane opening control instruction.
2. The method of claim 1, wherein the plurality of controllers comprises a first controller, a second controller, and a third controller; the parameter in the first controller is at a first standard load working point L 1 Setting to obtain the parameters in the second controller at a second standard load working condition point L 2 Setting to obtain the parameters in the third controller at a third standard load working condition point L 3 Setting to obtain, L 1 ＜L 2 ＜L 3 ≤100％。
3. The method of claim 2, wherein the weight coefficients for each of the plurality of controllers are determined from the current load operating point by the following formula;
wherein L is the current load working condition point, lambda 1 For the weight coefficient lambda corresponding to the first controller 2 For the weight coefficient lambda corresponding to the second controller 3 And the weight coefficient corresponding to the third controller.
4. The method of claim 1, wherein the generating inlet guide vane opening control instructions from the plurality of weighted output values comprises:
determining a current power generation load set value and a feedforward correction function of the power generation load set value on the opening degree of the inlet guide vane of the gas turbine;
obtaining a first correction value according to the current power generation load set value and a feedforward correction function of the power generation load set value on the opening of the inlet guide vane;
and generating an inlet guide vane opening control instruction according to the weighted output values and the first correction value.
5. The method of claim 4, wherein the generating inlet guide vane opening control instructions from the plurality of weighted output values and the first correction value comprises:
when the gas turbine is in load reduction operation, performing gain processing on the first correction value to obtain a second correction value;
and generating an inlet guide vane opening control instruction according to the weighted output values and the second correction value.
6. The method of claim 4, wherein the obtaining a first correction value based on the current power generation load setting and a feed-forward correction function of power generation load setting to inlet guide vane opening comprises:
acquiring an inlet pressure value and an inlet temperature value of the air compressor;
determining a first correction function of the compressor inlet pressure to the power generation load set value and a second correction function of the compressor inlet temperature and the compressor inlet temperature to the power generation load set value;
correcting the current power generation load set value according to the compressor inlet pressure value, the compressor inlet temperature value, the first correction function and the second correction function to obtain a third correction value;
and obtaining a first correction value according to the third correction value and the feedforward correction function.
7. A gas turbine inlet guide vane opening control device, comprising:
the first calculation module is used for obtaining an exhaust temperature reference value and an exhaust temperature value of the gas turbine and obtaining a temperature difference value between the exhaust temperature reference value and the exhaust temperature value;
the second calculation module is used for inputting the temperature difference value into a plurality of controllers to obtain output values corresponding to the controllers, wherein parameters in the controllers are obtained by setting at different standard load working condition points;
the determining module is used for determining a current load working condition point of the gas turbine and determining weight coefficients corresponding to the controllers according to the current load working condition point;
the processing module is used for respectively carrying out weighting processing on the output values corresponding to the controllers based on the weight coefficients corresponding to the controllers so as to obtain a plurality of weighted output values;
and the control module is used for generating an inlet guide vane opening control instruction according to the weighted output values and controlling the opening of the inlet guide vane of the gas turbine based on the inlet guide vane opening control instruction.
8. The apparatus of claim 7, wherein the plurality of controllers comprises a first controller, a second controller, and a third controller; the parameter in the first controller is at a first standard load working point L 1 Setting to obtain the parameters in the second controller at a second standard load working condition point L 2 Setting to obtain the parameters in the third controller at a third standard load working condition point L 3 Setting to obtain, L 1 ＜L 2 ＜L 3 ≤100％。
9. The apparatus of claim 8, wherein the determination module determines the respective weighting coefficients for the plurality of controllers according to the current load operating point by:
wherein L is the current load working condition point, lambda 1 For the weight coefficient lambda corresponding to the first controller 2 For the weight coefficient lambda corresponding to the second controller 3 And the weight coefficient corresponding to the third controller.
10. Control device for inlet guide vanes of a gas turbine, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1-6 when executing the program.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310713557.9A CN116753041A (en) | 2023-06-15 | 2023-06-15 | Method and device for controlling opening degree of inlet guide vane of gas turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310713557.9A CN116753041A (en) | 2023-06-15 | 2023-06-15 | Method and device for controlling opening degree of inlet guide vane of gas turbine |
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| CN202310713557.9A Pending CN116753041A (en) | 2023-06-15 | 2023-06-15 | Method and device for controlling opening degree of inlet guide vane of gas turbine |
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