CN116181497A - Control method and device for gas turbine combined cycle unit - Google Patents
Control method and device for gas turbine combined cycle unit Download PDFInfo
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- CN116181497A CN116181497A CN202211097552.XA CN202211097552A CN116181497A CN 116181497 A CN116181497 A CN 116181497A CN 202211097552 A CN202211097552 A CN 202211097552A CN 116181497 A CN116181497 A CN 116181497A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
The embodiment of the invention discloses a control method and a control device of a gas turbine combined cycle unit. The control method comprises the following steps: under the condition that the gas turbine combined cycle unit executes AGC control to adjust load and the gas turbine combined cycle unit enters a temperature control mode, detecting whether a load reference value of the gas turbine combined cycle unit is reduced to a current actual load or not; if the detection result is yes, controlling a fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is achieved; and calculating a rotating speed reference corresponding to the rotating speed control fuel stroke reference of the gas turbine combined cycle unit in the rotating speed control mode according to the fuel stroke reference, so that the gas turbine combined cycle unit exits the temperature control mode in time and enters the rotating speed control mode, and undisturbed switching control is realized. The scheme provided by the invention can achieve the technical effect that the unit can automatically and quickly respond to the AGC load instruction.
Description
Technical Field
The invention relates to the field of application of automatic control technology, in particular to a control method and device of a gas turbine combined cycle unit.
Background
Automatic power generation control (Automatic Generation Control, AGC for short) is a basic and important function of modern grid operation control, and is an advanced technical means for establishing closed-loop control between a highly automated energy management system of a grid and a coordinated control system of a generator set. The implementation of AGC can obtain real-time power supply and demand balance on the premise of high-quality electric energy, so that the economical efficiency of power grid operation is improved, and the labor intensity of power grid scheduling operators, namely power plant scheduling operators, is reduced. Along with the rapid development of the automation level of the power system and the improvement of the requirements of society on the power supply quality, AGC becomes an important step for realizing the economic and optimized operation of the power grid, and is also a necessary trend of the development of the power technology to a high level.
At present, the domestic power grid generally requires load regulation of a thermal power plant unit to participate in AGC control, and the gas turbine combined cycle unit has the advantages of high efficiency, low emission, good start-stop activity, good peak regulation performance (the load change range and the change rate are generally better than those of a coal-fired unit) and the like, and the peak regulation task is increasingly borne in the current power grid structure, so that the gas turbine combined cycle unit has very close relation with the AGC. According to the characteristics of the combustion engines, each combustion engine has a basic load (namely a highest load) in operation, and the highest load is directly influenced by factors such as atmospheric environment temperature and the like. Typically, when the gas turbine is up-loaded to base load, the unit enters a temperature control mode, and the exhaust temperature control circuit outputs a smaller amount of fuel than the output of the speed control circuit. Since the speed control loop initially maintains a positive bias, the speed control loop output fuel amount remains greater than the temperature control loop output value a few minutes before the gas turbine load command begins to decrease, and the unit remains in temperature control mode. The variable load rate of the unit can not reach a default value within the first few minutes of load reduction after the unit enters the temperature control mode, and can not timely respond to the AGC control instruction until the unit exits the temperature control and enters the rotating speed control mode, thereby seriously affecting the AGC regulation performance.
Aiming at the problem that the AGC regulation performance is seriously influenced due to the fact that the prior art cannot respond to an AGC control command in time in a temperature control mode, no effective solution is proposed at present.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention is expected to provide a control method and a control device of a gas turbine combined cycle unit, so as to at least solve the problem that AGC regulation performance is seriously affected due to the fact that AGC control instructions cannot be responded in time in a temperature control mode in the prior art.
The technical scheme of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a control method for a gas turbine combined cycle unit, including: under the condition that the gas turbine combined cycle unit executes AGC control to adjust load and the gas turbine combined cycle unit enters a temperature control mode, detecting whether a load reference value of the gas turbine combined cycle unit is reduced to a current actual load or not; if the detection result is yes, controlling a fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is achieved; and calculating a rotating speed reference corresponding to the rotating speed control fuel stroke reference of the gas turbine combined cycle unit in the rotating speed control mode according to the fuel stroke reference, so that the gas turbine combined cycle unit exits the temperature control mode in time and enters the rotating speed control mode, and undisturbed switching control is realized.
Optionally, the method further comprises: the change in fuel stroke reference is proportional to the difference between the given control reference and the actual rotational speed.
Further, optionally, the method further comprises: after the gas turbine combined cycle unit is connected with the grid, performing deviation dead zone optimization control through a fuel stroke reference with differential rotation speed control, wherein the performing deviation dead zone optimization control through the fuel stroke reference with differential rotation speed control comprises the following steps: when the rotation speed deviation is within the preset interval, deviation adjustment is not performed until the rotation speed deviation is larger than the preset interval, and deviation larger than the preset interval is adjusted.
Optionally, the rotation speed reference is an output selected by an intermediate value selection gate, wherein the intermediate value selection gate is provided with a high limit value, a low limit value in an operation stage, a low limit value in a start-up or stop stage and a preset value.
Further, optionally, calculating a rotation speed reference corresponding to the rotation speed control fuel stroke reference of the gas turbine combined cycle unit in the rotation speed control mode according to the fuel stroke reference includes: in the AGC load reduction process, when the load reference value is reduced to the current actual load, the rotating speed control fuel stroke reference of the gas turbine combined cycle unit is enabled to track the current temperature control fuel stroke reference at the critical position; when the load reference value is reduced to be smaller than the actual load, the gas turbine combined cycle unit timely exits from the temperature control mode and does not disturb entering into the rotating speed control mode.
In a second aspect, an embodiment of the present invention provides a control apparatus for a gas turbine combined cycle unit, including: the detection module is used for detecting whether the load reference value of the gas turbine combined cycle unit is reduced to the current actual load stage or not under the condition that the gas turbine combined cycle unit executes AGC control to adjust the load and the gas turbine combined cycle unit enters a temperature control mode; the control module is used for controlling the fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is detected; the calculation module is used for calculating the rotating speed reference corresponding to the rotating speed control fuel stroke reference of the gas turbine combined cycle unit in the rotating speed control mode according to the fuel stroke reference, so that the gas turbine combined cycle unit exits the temperature control mode in time and enters the rotating speed control mode, and undisturbed switching control is realized.
Alternatively, the fuel stroke reference varies in proportion to the difference between the given control reference and the actual rotational speed.
Further optionally, the apparatus further comprises: the optimization control module is used for carrying out deviation dead zone optimization control through a fuel stroke reference with differential rotation speed control after the gas turbine combined cycle unit is connected with the grid, wherein the deviation dead zone optimization control through the fuel stroke reference with differential rotation speed control comprises the following steps: when the rotation speed deviation is within the preset interval, deviation adjustment is not performed until the rotation speed deviation is larger than the preset interval, and deviation larger than the preset interval is adjusted.
Optionally, the rotation speed reference is an output selected by an intermediate value selection gate, wherein the intermediate value selection gate is provided with a high limit value, a low limit value in an operation stage, a low limit value in a start-up or stop stage and a preset value.
Further, optionally, the calculating module includes: the tracking unit is used for enabling the rotating speed control fuel stroke reference of the gas turbine combined cycle unit to track the current temperature control fuel stroke reference at the critical position when the load reference value is reduced to the current actual load in the AGC load reduction process of the gas turbine combined cycle unit; and the calculating unit is used for timely exiting the temperature control mode and not disturbing entering the rotating speed control mode when the load reference value is reduced to be smaller than the actual load.
The embodiment of the invention provides a control method and a control device for a gas turbine combined cycle unit. Under the condition that the gas turbine combined cycle unit executes AGC control to adjust load and the gas turbine combined cycle unit enters a temperature control mode, detecting whether a load reference value of the gas turbine combined cycle unit is reduced to a current actual load or not; if the detection result is yes, controlling a fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is achieved; and calculating a rotating speed reference corresponding to the rotating speed control fuel stroke reference of the gas turbine combined cycle unit in the rotating speed control mode according to the fuel stroke reference, so that the gas turbine combined cycle unit exits from the temperature control mode in time and enters into the rotating speed control mode, undisturbed switching control is realized, and the technical effect that the unit can automatically and quickly respond to the AGC load instruction can be achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic flow chart of a method for controlling a combined cycle unit of a gas turbine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control method of a combined cycle unit of a gas turbine according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control device of a gas turbine combined cycle unit according to a second embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and in the drawings are used for distinguishing between different objects and not for limiting a particular order.
It should be noted that, the following embodiments of the present invention may be implemented separately or in combination with each other, and the embodiments of the present invention are not limited thereto.
Example 1
In a first aspect, an embodiment of the present invention provides a control method of a gas turbine combined cycle unit, and fig. 1 is a schematic flow chart of a control method of a gas turbine combined cycle unit provided in a first embodiment of the present invention; as shown in fig. 1, the control method of the gas turbine combined cycle unit provided in the embodiment of the application includes:
step S102, detecting whether a load reference value of the gas turbine combined cycle unit is reduced to a current actual load stage under the condition that the gas turbine combined cycle unit executes AGC control to adjust the load and the gas turbine combined cycle unit enters a temperature control mode;
step S104, under the condition that the detection result is yes, controlling the fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is carried out;
and step S106, calculating a rotating speed reference corresponding to the rotating speed control fuel stroke reference of the gas turbine combined cycle unit in the rotating speed control mode according to the fuel stroke reference, so that the gas turbine combined cycle unit exits the temperature control mode in time and enters the rotating speed control mode, and undisturbed switching control is realized.
Optionally, the control method of the gas turbine combined cycle unit provided by the embodiment of the application further includes: the change in fuel stroke reference is proportional to the difference between the given control reference and the actual rotational speed.
Further, optionally, the control method of the gas turbine combined cycle unit provided in the embodiment of the present application further includes: after the gas turbine combined cycle unit is connected with the grid, performing deviation dead zone optimization control through a fuel stroke reference with differential rotation speed control, wherein the performing deviation dead zone optimization control through the fuel stroke reference with differential rotation speed control comprises the following steps: when the rotation speed deviation is within the preset interval, deviation adjustment is not performed until the rotation speed deviation is larger than the preset interval, and deviation larger than the preset interval is adjusted.
Optionally, the rotation speed reference is an output selected by an intermediate value selection gate, wherein the intermediate value selection gate is provided with a high limit value, a low limit value in an operation stage, a low limit value in a start-up or stop stage and a preset value.
Further optionally, calculating, in step S106, a rotation speed reference corresponding to the rotation speed control fuel stroke reference of the gas turbine combined cycle unit in the rotation speed control mode according to the fuel stroke reference includes: in the AGC load reduction process, when the load reference value is reduced to the current actual load, the rotating speed control fuel stroke reference of the gas turbine combined cycle unit is enabled to track the current temperature control fuel stroke reference at the critical position; when the load reference value is reduced to be smaller than the actual load, the gas turbine combined cycle unit timely exits from the temperature control mode and does not disturb entering into the rotating speed control mode.
In summary, fig. 2 is a schematic diagram of a control method of a combined cycle unit of a gas turbine according to an embodiment of the present invention, as shown in fig. 2,
in the control method of the gas turbine combined cycle unit, when the load is regulated by AGC (automatic gain control) and the unit enters a temperature control mode, in the stage that the load reference value (variable quantity, not a fixed value) of the unit is reduced to the current actual load, the rotating speed reference (TNR) corresponding to the rotating speed control fuel travel reference (FSRN) of the unit in the rotating speed control mode under the working condition is reversely calculated through the temperature control fuel travel reference (FSRT) when the load reference value is equal to the current actual load of the unit, so that the unit exits the temperature control mode in time to enter the rotating speed control mode, and undisturbed switching control is realized; and meanwhile, the rotating speed control of the unit is optimally controlled, and the adjusting performance of the unit in AGC control is improved.
In the embodiment of the application, the rotation speed control of the gas turbine combined cycle unit follows a proportional control rule, namely that the change of a Fuel Stroke Reference (FSR) is proportional to the difference between a given control reference (rotation speed given value or rotation speed reference) TNR and the actual rotation speed, namely:
ΔFSR∝(TNR-TNHSYS)
FSRN＝(TNR-TNHSYS)*K DROOP +FSRN 0
FSRN-fuel stroke reference with differential speed control;
TNHSYS-rotation speed with filter rate limit
TNR-rotation speed reference;
K DROOP -determining a control constant having a differential speed control inequality δ;
FSRN 0 -FSR value for full speed (rated speed) no load of the gas turbine, fixed constant;
after the gas turbine combined cycle unit is connected with the grid, deviation dead zone optimization control is carried out through the differential rotation speed control (FSRN), namely when the rotation speed deviation is within 2 rotations, deviation adjustment is not carried out until the rotation speed deviation exceeds 2 rotations, and then the deviation exceeding 2 rotations is adjusted. That is to say,
FSRN＝(TNR-F 1 (x))*K DROOP +FSRN 0
wherein, the liquid crystal display device comprises a liquid crystal display device,
TNR is an output selected by an intermediate value select gate (i.e., high-low limit) in the speed control logic, and the intermediate value select gate is provided with 4 constant inputs. Namely a high limit value TNRK1, a low limit value TNRK2 in an operation stage, a low limit value TNRK3 in a starting or stopping stage and a preset value TNRK4;
in this case, tnrk1=107% during operation, so that it is ensured that even with a grid surplus power (frequency up to 103%), the gas turbine can still produce full power when there is a differential rotational speed control differential rate δ=4%; tnrk1=111.5% when the unit is overspeed tested, so that the turbine can raise the rotational speed to this value when idling.
The lower limit value TNRK2=95% of the operation stage ensures that the turbine load can be reduced to zero through TNR even if the power grid is under-powered (the frequency is as low as 95 percent);
the low limit value TNRK3=0% in the starting or stopping stage, namely, the unit starts at zero rotation speed, and the rotation speed control can be used for intervening FSR control;
the preset value tnrk4=100.3% is used for preparing the rotation speed of the grid connection, the rated value of the grid frequency is 100%, and the exceeding value of 0.3% is used for avoiding the reverse power of the generator caused by the fluctuation of the grid frequency after the grid connection.
Z -1 And addingThe integrator constitutes a digital integrator, L83JDn determines a certain value of the lifting rate constant tnkr1_n, i.e. different integration rate constants are selected by different logic. The automatic load lifting command L70R/L70L determines the direction of integration, that is, when l70l=0, the integral value rises, TNR is gradually increased, reverse integration realizes the lowering of TNR, l70r=0, and l70l=0, and when the integration is stopped, TNR remains unchanged.
In the AGC load-reducing process, when the load reference value is reduced to the current actual load, the rotating speed control Fuel Stroke Reference (FSRN) of the unit is enabled to track the temperature control Fuel Stroke Reference (FSRT) at the moment at the critical position, and the unit timely exits from the temperature control mode and does not disturb entering into the rotating speed control mode along with the reduction of the load reference value to be smaller than the actual load.
FSRT＝FSRN＝(TNR-F1(x))*K DROOP +FSRN 0
Namely, TNR= (FSRT-FSRN 0 )/K DROOP +F1(x)
The rotational speed reference (TNR) of the unit under the rotational speed control fuel stroke reference corresponding to the fuel stroke reference under the temperature control mode is denoted as F2 (x), namely F2 (x) = (FSRT-FSRN) 0 )/K DROOP +F1(x)
The rotation speed reference calculation logic is as follows:
TNR(i)＝IF(A,IF(B,F2(x),TNR(i-1)),TNR(i-1))
wherein:
TNR (i): a rotational speed reference at the current moment;
TNR (i-1): a rotational speed reference at the previous moment;
after the unit is connected with the power grid, AGC control is put into operation and the unit is in a temperature control mode;
under the condition A, when the unit load reference value is reduced to the actual load, triggering a short pulse signal or a rising edge signal;
according to the control method of the gas turbine combined cycle unit, when the load is regulated through AGC control and the unit enters a temperature control mode, the temperature control mode can be timely exited without disturbance to enter the rotating speed control mode, AGC control commands are responded quickly, power grid control is responded, and the automation level of the unit and the competitiveness of a power plant are improved.
The embodiment of the invention provides a control method of a gas turbine combined cycle unit. Under the condition that the gas turbine combined cycle unit executes AGC control to adjust load and the gas turbine combined cycle unit enters a temperature control mode, detecting whether a load reference value of the gas turbine combined cycle unit is reduced to a current actual load or not; if the detection result is yes, controlling a fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is achieved; and calculating a rotating speed reference corresponding to the rotating speed control fuel stroke reference of the gas turbine combined cycle unit in the rotating speed control mode according to the fuel stroke reference, so that the gas turbine combined cycle unit exits from the temperature control mode in time and enters into the rotating speed control mode, undisturbed switching control is realized, and the technical effect that the unit can automatically and quickly respond to the AGC load instruction can be achieved.
Example two
In a second aspect, an embodiment of the present invention provides a control device for a gas turbine combined cycle unit, and fig. 3 is a schematic diagram of a control device for a gas turbine combined cycle unit provided in a second embodiment of the present invention, as shown in fig. 3, where the control device for a gas turbine combined cycle unit provided in the embodiment of the present invention includes: the detection module 32 is used for detecting whether the load reference value of the gas turbine combined cycle unit is reduced to the current actual load stage when the gas turbine combined cycle unit executes AGC control to adjust the load and the gas turbine combined cycle unit enters a temperature control mode; the control module 34 is used for controlling the fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is detected as yes; the calculating module 36 is configured to calculate, according to the fuel stroke reference, a rotational speed reference corresponding to the rotational speed control fuel stroke reference of the gas turbine combined cycle unit in the rotational speed control mode, so that the gas turbine combined cycle unit exits the temperature control mode in time and enters the rotational speed control mode, thereby implementing undisturbed switching control.
Alternatively, the fuel stroke reference varies in proportion to the difference between the given control reference and the actual rotational speed.
Further, optionally, the control device of the gas turbine combined cycle unit provided in the embodiment of the present application further includes: the optimization control module is used for carrying out deviation dead zone optimization control through a fuel stroke reference with differential rotation speed control after the gas turbine combined cycle unit is connected with the grid, wherein the deviation dead zone optimization control through the fuel stroke reference with differential rotation speed control comprises the following steps: when the rotation speed deviation is within the preset interval, deviation adjustment is not performed until the rotation speed deviation is larger than the preset interval, and deviation larger than the preset interval is adjusted.
Optionally, the rotation speed reference is an output selected by an intermediate value selection gate, wherein the intermediate value selection gate is provided with a high limit value, a low limit value in an operation stage, a low limit value in a start-up or stop stage and a preset value.
Further, optionally, the calculating module includes: the tracking unit is used for enabling the rotating speed control fuel stroke reference of the gas turbine combined cycle unit to track the current temperature control fuel stroke reference at the critical position when the load reference value is reduced to the current actual load in the AGC load reduction process of the gas turbine combined cycle unit; and the calculating unit is used for timely exiting the temperature control mode and not disturbing entering the rotating speed control mode when the load reference value is reduced to be smaller than the actual load.
The embodiment of the invention provides a control device of a gas turbine combined cycle unit. Under the condition that the gas turbine combined cycle unit executes AGC control to adjust load and the gas turbine combined cycle unit enters a temperature control mode, detecting whether a load reference value of the gas turbine combined cycle unit is reduced to a current actual load or not; if the detection result is yes, controlling a fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is achieved; and calculating a rotating speed reference corresponding to the rotating speed control fuel stroke reference of the gas turbine combined cycle unit in the rotating speed control mode according to the fuel stroke reference, so that the gas turbine combined cycle unit exits from the temperature control mode in time and enters into the rotating speed control mode, undisturbed switching control is realized, and the technical effect that the unit can automatically and quickly respond to the AGC load instruction can be achieved.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method of controlling a gas turbine combined cycle unit, comprising:
under the condition that the gas turbine combined cycle unit executes AGC control to adjust load and the gas turbine combined cycle unit enters a temperature control mode, detecting whether a load reference value of the gas turbine combined cycle unit is reduced to a current actual load or not;
if the detection result is yes, controlling a fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is achieved;
and calculating a rotating speed reference corresponding to the rotating speed control fuel stroke reference of the gas turbine combined cycle unit in the rotating speed control mode according to the fuel stroke reference, so that the gas turbine combined cycle unit exits from the temperature control mode in time and enters into the rotating speed control mode, and undisturbed switching control is realized.
2. The control method according to claim 1, characterized in that the method further comprises: the fuel stroke reference varies in proportion to the difference between a given control reference and the actual rotational speed.
3. The control method according to claim 2, characterized in that the method further comprises:
after the gas turbine combined cycle unit is connected with the grid, performing deviation dead zone optimization control through the fuel stroke reference with differential rotation speed control, wherein the performing deviation dead zone optimization control through the fuel stroke reference with differential rotation speed control comprises the following steps: and when the rotation speed deviation is within a preset interval, not performing deviation adjustment until the rotation speed deviation is larger than the preset interval, and adjusting the deviation larger than the preset interval.
4. A control method according to any one of claims 1 to 3, wherein the rotation speed reference is an output selected by an intermediate value selection gate provided with a high limit value, an operation stage low limit value, a start-up or stop stage low limit value, and a preset value.
5. The control method according to claim 4, wherein calculating a rotational speed reference corresponding to a rotational speed control fuel stroke reference of the gas turbine combined cycle unit in a rotational speed control mode according to the fuel stroke reference comprises:
in the AGC load reduction process, when the load reference value is reduced to the current actual load, the rotating speed control fuel stroke reference of the gas turbine combined cycle unit is enabled to track the current temperature control fuel stroke reference at a critical position;
when the load reference value is reduced to be smaller than the actual load, the gas turbine combined cycle unit timely exits from the temperature control mode and does not disturb entering into the rotating speed control mode.
6. A control device for a gas turbine combined cycle plant, comprising:
the detection module is used for detecting whether the load reference value of the gas turbine combined cycle unit is reduced to the current actual load stage or not under the condition that the gas turbine combined cycle unit executes AGC control to adjust the load and the gas turbine combined cycle unit enters a temperature control mode;
the control module is used for controlling the fuel stroke reference through the fact that the load reference value is equal to the temperature when the current actual unit load is detected;
the calculation module is used for calculating the rotating speed reference corresponding to the rotating speed control fuel stroke reference of the gas turbine combined cycle unit in the rotating speed control mode according to the fuel stroke reference, so that the gas turbine combined cycle unit can timely exit from the temperature control mode and enter the rotating speed control mode, and undisturbed switching control is realized.
7. The control device of claim 6, wherein the change in fuel stroke reference is proportional to a difference between a given control reference and an actual rotational speed.
8. The control device of claim 7, wherein the device further comprises:
the optimization control module is used for carrying out deviation dead zone optimization control through the fuel stroke standard with differential rotation speed control after the gas turbine combined cycle unit is connected with the grid, wherein the deviation dead zone optimization control through the fuel stroke standard with differential rotation speed control comprises the following steps: and when the rotation speed deviation is within a preset interval, not performing deviation adjustment until the rotation speed deviation is larger than the preset interval, and adjusting the deviation larger than the preset interval.
9. A control device according to any one of claims 6 to 8, wherein the rotation speed reference is an output selected by an intermediate value selection gate provided with a high limit value, an operation stage low limit value, a start-up or stop stage low limit value, and a preset value.
10. The control device of claim 9, wherein the computing module comprises:
the tracking unit is used for enabling the rotating speed control fuel stroke reference of the gas turbine combined cycle unit to track the current temperature control fuel stroke reference at a critical position when the load reference value is reduced to the current actual load in the AGC load reduction process of the gas turbine combined cycle unit;
and the calculating unit is used for timely exiting the temperature control mode and not disturbing entering the rotating speed control mode when the load reference value is reduced to be smaller than the actual load.
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| CN202211097552.XA CN116181497A (en) | 2022-09-08 | 2022-09-08 | Control method and device for gas turbine combined cycle unit |
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