Gas turbine exhaust temperature control method and system

Abstract

The invention discloses a gas turbine exhaust temperature control method and system, and relates to the technical field of gas turbines.The method comprises the steps that operation data of a gas turbine unit are collected, and the generating efficiency of the unit is calculated in real time; according to the starting condition of IGV temperature control reference correction, whether the unit load triggers IGV temperature control reference correction logic or not is judged; and based on IGV temperature control reference correction logic, the IGV temperature control reference is dynamically adjusted, and the turbine exhaust temperature is controlled. According to the method, the generating efficiency of the unit is calculated in real time and compared with a historical efficiency value, the IGV temperature control reference correction is dynamically adjusted, so that the turbine exhaust temperature is always close to the optimal value within a safe range, the output matching degree of a gas turbine and a steam turbine is improved, and therefore the overall efficiency of the combined cycle unit is improved; and by setting a manual switching mechanism, an operator can disable a correction function at any time, a traditional control mode is recovered, and safe operation of the unit is prevented from being influenced when algorithm abnormity or extreme working conditions occur.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a method and system for controlling the exhaust temperature of a gas turbine turbine. Background Art

[0002] With the global energy structure transforming towards low-carbon, gas turbines and gas-steam combined cycle power generation technologies play an important peak shaving role in the power system due to their advantages such as fast start-stop, flexible load regulation, and low emissions, and have become the key support for balancing the volatility of renewable energy. The exhaust temperature of the turbine, as a core control parameter of the gas turbine, directly affects the unit efficiency, the performance of the waste heat boiler, and the output of the steam turbine. The optimization of its control strategy is an important way to improve the overall economy of the combined cycle. In the prior art, the control of the exhaust temperature of the turbine mainly relies on adjusting the opening of the inlet guide vane (IGV) of the compressor. Through a fixed algorithm, such as setting a temperature control reference based on the relationship between the compressor pressure ratio, the compressor exhaust temperature, and the turbine exhaust temperature, and combining a PID controller to achieve closed-loop control. Such methods have a certain degree of reliability. However, with the increasing penetration rate of renewable energy and the increasing peak shaving demand of the power system for gas turbine generator sets, the limitations of traditional control strategies are gradually emerging.

[0003] Firstly, most of the existing IGV temperature control references adopt static mathematical models, such as the fixed functional relationship between the compressor pressure ratio, the compressor exhaust temperature, and the turbine exhaust temperature, without considering the dynamic changes in the real-time power generation efficiency of the unit. As a result, it is impossible to achieve the optimal matching of the gas turbine and the steam turbine output by adjusting the turbine exhaust temperature under partial load conditions, significantly limiting the improvement space of the overall unit efficiency. Secondly, traditional control strategies lack the ability to adapt to real-time operating conditions. Especially when the load fluctuates frequently, fixed algorithms are difficult to respond to dynamic disturbances such as changes in fuel characteristics and fluctuations in environmental parameters, easily causing the temperature control reference to deviate from the optimal value. In addition, the existing methods do not integrate an efficiency feedback mechanism. When the unit efficiency decreases due to changes in operating conditions, the temperature control reference cannot be corrected in time to restore the efficiency. The above defects make it difficult for the prior art to balance the requirements of the safe operation of the unit and the maximization of efficiency, and there is an urgent need for a control method with dynamic optimization capabilities to break through the inherent limitations of traditional strategies. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed.

[0005] Therefore, the technical problems solved by the present invention are: the existing gas turbine turbine exhaust temperature control method has insufficient efficiency optimization ability due to relying on a static mathematical model, lacks a real-time power generation efficiency feedback mechanism, has not established a temperature control reference adjustment strategy under partial load conditions, and how to dynamically maximize the power generation efficiency of the unit within a safe range.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: A method for controlling the exhaust gas temperature of a gas turbine includes collecting the operation data of the gas turbine unit and calculating the power generation efficiency of the unit in real time; judging whether the unit load triggers the IGV temperature control reference correction logic according to the enabling conditions for correcting the IGV temperature control reference; and dynamically adjusting the IGV temperature control reference and controlling the exhaust gas temperature of the turbine based on the IGV temperature control reference correction logic.

[0007] As a preferred embodiment of the method for controlling the exhaust gas temperature of a gas turbine according to the present invention, wherein: the operation data of the gas turbine unit includes the fuel flow data F of the gas turbine G and the actual load data L of the unit.

[0008] As a preferred embodiment of the method for controlling the exhaust gas temperature of a gas turbine according to the present invention, wherein: calculating the power generation efficiency of the unit includes calculating the average value of the fuel flow in a historical time window through an average value module and the average value L of the power generation load of the unit; the power generation efficiency E of the unit is the ratio of the average value of the fuel flow and the average value L of the power generation load of the unit, expressed as:

[0009]

[0010] The power generation efficiency E of the unit is delayed through a delay module to obtain the historical value E of the power generation efficiency of the unit after delay OLD .

[0011] As a preferred embodiment of the method for controlling the exhaust gas temperature of a gas turbine according to the present invention, wherein: the enabling conditions for correcting the IGV temperature control reference include that when the actual load L of the unit exceeds 100 MW, the flag bit S indicating that the unit has reached a certain load L is 1; the difference is taken between the actual load L of the unit and the average load within a historical time window , and when the absolute value of the deviation is less than 3 MW and lasts for 600 s, the ON delay module outputs S steady as 1, indicating that the current load of the unit is stable; when the exhaust gas temperature fuel flow reference U T is at least 3 greater than the specific speed load fuel flow reference U N , the flag bit S indicating that the unit is in the speed load control state and there is still a certain distance from entering the temperature control is 1; when the operator manually selects to allow the IGV temperature control reference correction to be enabled, the flag bit MAN indicating that the operator manually selects to allow the enabling is 1; when MAN, S U , S L , and S U as well as S steadyWhen all are 1, the flag bit S for starting the IGV temperature control reference correction is 1, the enable port EN input of the integration module is 1, the integration module starts to work, and the correction of the IGV temperature control reference is started.

[0012] As a preferred solution of the gas turbine turbine exhaust gas temperature control method described in the present invention, wherein: the dynamically adjusting the IGV temperature control reference and controlling the turbine exhaust gas temperature includes dynamically adjusting the IGV temperature control reference correction amount through an integration module; when S changes from 0 to 1, the signal generation module issues a pulse signal lasting for 60 s, within 60 s or E - E OLD > 0.002, then the outputs of the OR module and the inversion module are both 1, the UP input terminal of the integration module is 1, the DOWN input terminal is 0, and the output terminal of the integration module gradually increases at a rate of 0.5 / min at the R input terminal (speed limit input terminal) until the unit efficiency is basically stable or the output of the integration module reaches the upper limit; the threshold range of the basically stable unit efficiency is expressed as:

[0013] -0.002 ≤ E - E OLD ≤ 0.002

[0014] If the unit efficiency decreases as the integration module increases, when E - E OLD < -0.002, then the inversion module is 0, the DOWN input terminal of the integration module is 1, the UP input terminal is 0, and the output terminal of the integration module gradually decreases at a rate of 0.5 / min at the R input terminal (speed limit input terminal) until the unit efficiency is basically stable or the output of the integration module reaches the lower limit; the output of the integration module is the correction amount of the IGV temperature control reference.

[0015] As a preferred solution of the gas turbine turbine exhaust gas temperature control method described in the present invention, wherein: the dynamically adjusting the IGV temperature control reference and controlling the turbine exhaust gas temperature further includes that the operator manually selects the MAN signal. When MAN is 1, the correction of the IGV temperature control reference is allowed to be enabled; when MAN is 0, the IGV temperature control reference is restored to the traditional IGV temperature control reference; when a problem occurs in the calculation of the IGV temperature control reference correction amount or an extreme working condition occurs, the operator can set the MAN signal to 0 to cancel the correction of the IGV temperature control reference, and the IGV turbine exhaust gas temperature control system is restored to the traditional mode.

[0016] As a preferred embodiment of the gas turbine turbine exhaust gas temperature control method of the present invention, it includes: dynamically adjusting the IGV temperature control reference and controlling the turbine exhaust gas temperature further includes summing the traditional IGV temperature control reference and the correction amount of the IGV temperature control reference to obtain the IGV temperature control reference, calculating the IGV opening command through a PID controller using the IGV temperature control reference and the average value of the actual turbine exhaust gas temperature, and controlling the turbine exhaust gas temperature at the IGV temperature control reference by adjusting the IGV opening; the traditional IGV temperature control reference includes calculating the traditional IGV temperature control reference through a functional relationship using the compressor pressure ratio and the compressor exhaust gas temperature.

[0017] Another object of the present invention is to provide a gas turbine turbine exhaust gas temperature control system, which can dynamically correct the IGV temperature control reference by real-time calculating the power generation efficiency of the unit, and solves the technical problem that the current fixed algorithm control strategy cannot optimize the turbine exhaust gas temperature according to the real-time working conditions, resulting in low unit efficiency.

[0018] As a preferred embodiment of the gas turbine turbine exhaust gas temperature control system of the present invention, it includes: an efficiency calculation module, a logic judgment module, and a reference correction module; the efficiency calculation module is used to collect the operation data of the gas turbine unit and calculate the power generation efficiency of the unit in real time; the logic judgment module is used to judge whether the unit load triggers the IGV temperature control reference correction logic according to the enabling condition of the IGV temperature control reference correction; the reference correction module is used to dynamically adjust the IGV temperature control reference and control the turbine exhaust gas temperature based on the IGV temperature control reference correction logic.

[0019] A computer device includes a memory and a processor, the memory stores a computer program, and the processor executes the computer program to implement the steps of the gas turbine turbine exhaust gas temperature control method.

[0020] A computer-readable storage medium stores a computer program thereon, and when the computer program is executed by a processor, it implements the steps of the gas turbine turbine exhaust gas temperature control method.

[0021] Advantages of the present invention: One solution of the gas turbine turbine exhaust gas temperature control method provided by the present invention can dynamically adjust the IGV temperature control reference correction amount by calculating the power generation efficiency of the unit in real time and comparing it with the historical efficiency value, enabling the turbine exhaust gas temperature to always approach the optimal value within the safe range, improving the output matching degree of the gas turbine and the steam turbine, and thus enhancing the overall efficiency of the combined cycle unit; by introducing load stability detection and correction condition judgment, it can avoid misadjustment caused by frequent load fluctuations; by gradually adjusting the correction amount through the integral module, it can ensure the smooth change of the temperature control reference and enhance the stability of the system; by setting a manual switching mechanism, the operator can disable the correction function at any time and restore the traditional control mode, which can avoid affecting the safe operation of the unit when the algorithm is abnormal or under extreme conditions; through reverse correction of efficiency decline, the temperature control reference deviation is corrected in real time to avoid continuous deterioration of efficiency; by combining the upper and lower limit constraints of the integral module, it is ensured that the correction amount is always limited by the safety thresholds of the combustion state and equipment materials; through real-time efficiency feedback, dynamic correction logic and multiple safety mechanisms, the present invention solves the defects of the static model of the traditional control strategy being rigid and having poor fault tolerance, and realizes the optimal control of the gas turbine turbine exhaust gas temperature on the premise of ensuring the safe operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings without creative efforts based on these drawings.

[0023] Figure 1 It is the overall flowchart of a gas turbine turbine exhaust gas temperature control method provided by the first embodiment of the present invention.

[0024] Figure 2 It is the control logic diagram of a gas turbine turbine exhaust gas temperature control method provided by the first embodiment of the present invention.

[0025] In the figure: 1 and 2 are average value calculation modules; 3, 4, 9, 10, 13, and 26 are addition and subtraction modules; 5 and 18 are division modules; 6 is an absolute value module; 7, 8, 12, 15, and 16 are comparator modules; 11 is a delay module; 14 is an ON-delay module; 17 and 23 are AND modules; 19 is an OR module; 20 is a signal generation module; 21 is a function for traditionally calculating the IGV temperature control reference from the compressor pressure ratio and the compressor exhaust gas temperature; 22 is an inversion module; 24 is an integral module; 25 is an analog quantity selection module; 27 is a PID controller.

[0026] Figure 3It is the overall flowchart of a gas turbine turbine exhaust temperature control system provided for the third embodiment of the present invention. Specific Embodiments

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0028] Example 1, referring to Figure 1 - Figure 2 , which is an embodiment of the present invention, provides a gas turbine turbine exhaust temperature control method, including:

[0029] S1: Collect the operating data of the gas turbine unit and calculate the power generation efficiency of the unit in real time.

[0030] Furthermore, the operating data of the gas turbine unit includes the gas turbine fuel flow data F G and the actual load data L of the unit.

[0031] It should be noted that calculating the power generation efficiency of the unit includes calculating the average fuel flow of a historical time window through an average value module and the average power generation load of the unit The power generation efficiency E of the unit is the ratio of the average fuel flow and the average power generation load of the unit , expressed as:

[0032]

[0033] The power generation efficiency E of the unit is delayed through a delay module to obtain the historical value E of the power generation efficiency of the unit after delay OLD .

[0034] It should also be noted that the time window is adjusted according to the actual situation.

[0035] It should also be noted that real-time collection of the operating data of the gas turbine unit and calculation of the power generation efficiency ensure that the system can respond in a timely manner when the operating state of the unit changes, and can be dynamically adjusted according to the current working conditions to achieve maximum efficiency; the power generation efficiency value of the unit is an important input for the subsequent control logic, and is an important parameter for judging whether it is necessary to adjust the IGV temperature control reference, avoiding efficiency decline, and always keeping the unit in the best operating state; calculating the power generation efficiency of the unit is the basis for realizing dynamic optimization control. The system can make the turbine exhaust temperature always approach the optimum within the safe range according to the current working conditions, improve the output matching degree of the gas turbine and the steam turbine, and ultimately improve the overall efficiency of the combined cycle unit.

[0036] S2: According to the enabling condition of the IGV temperature control reference correction, judge whether the unit load triggers the IGV temperature control reference correction logic.

[0037] Furthermore, the enabling conditions for the IGV temperature control reference correction include that when the actual load L of the unit exceeds 100 MW, the flag bit S indicating that the unit has reached a certain load is 1; the difference between the actual load L of the unit and the load average value within a historical time window is calculated. L When the absolute value of the deviation is less than 3 MW and lasts for 600 s, the ON delay module outputs S as 1, indicating that the current load of the unit is stable; when the turbine exhaust temperature fuel flow reference U is at least 3 greater than the specific speed load fuel flow reference U, the flag bit S indicating that the unit is in the speed load control state and there is still a certain distance from entering the temperature control is 1; when the operator manually selects to allow the enabling of the IGV temperature control reference correction, the flag bit MAN indicating that the operator manually selects to allow the enabling is 1; when MAN, S, S, and S are all 1, the flag bit S for starting the IGV temperature control reference correction is 1, and the enable port EN of the integral module inputs 1, and the integral module starts to work, and the correction of the IGV temperature control reference starts to be enabled. When the absolute value of the difference is less than 3 MW and lasts for 600 s, the ON delay module outputs S as 1. steady When the turbine exhaust temperature fuel flow reference U is at least 3 greater than the specific speed load fuel flow reference U, the flag bit S indicating that the unit is in the speed load control state and there is still a certain distance from entering the temperature control is 1. T Specific speed load fuel flow reference U N When the turbine exhaust temperature fuel flow reference U is at least 3 greater than the specific speed load fuel flow reference U, the flag bit S indicating that the unit is in the speed load control state and there is still a certain distance from entering the temperature control is 1. U When the operator manually selects to allow the enabling of the IGV temperature control reference correction, the flag bit MAN indicating that the operator manually selects to allow the enabling is 1. L S U S steady When MAN, S, S, and S are all 1, the flag bit S for starting the IGV temperature control reference correction is 1, and the enable port EN of the integral module inputs 1, and the integral module starts to work, and the correction of the IGV temperature control reference starts to be enabled.

[0038] It should be noted that the enabling conditions for the IGV temperature control reference correction ensure that the IGV temperature control reference correction logic starts under appropriate working conditions, avoid efficiency losses caused by misoperations, and improve the reliability and safety of the system.

[0039] The multiple judgment mechanism includes judging whether the unit has reached a certain load, judging whether the unit load is stable, judging whether the unit is in the speed load control state, and manual selection for enabling.

[0040] S3: Based on the IGV temperature control reference correction logic, dynamically adjust the IGV temperature control reference and control the turbine exhaust temperature.

[0041] Further, dynamically adjusting the IGV temperature control reference and controlling the turbine exhaust temperature includes dynamically adjusting the IGV temperature control reference correction amount through an integration module; when S changes from 0 to 1, the signal generation module issues a pulse signal lasting for 60 s, within 60 s or when E-E OLD > 0.002, then the outputs of the OR module and the inversion module are both 1, the UP input terminal of the integration module is 1, the DOWN input terminal is 0, and the output terminal of the integration module gradually increases at a rate of 0.5 / min at the R input terminal (speed limit input terminal) until the unit efficiency is basically stable or the output of the integration module reaches the upper limit; the threshold range for the unit efficiency to be basically stable is expressed as:

[0042] -0.002 ≤ E-E OLD ≤ 0.002

[0043] If the unit efficiency decreases as the integration module increases, when E-E OLD < -0.002, then the inversion module is 0, the DOWN input terminal of the integration module is 1, the UP input terminal is 0, and the output terminal of the integration module gradually decreases at a rate of 0.5 / min at the R input terminal (speed limit input terminal) until the unit efficiency is basically stable or the output of the integration module reaches the lower limit; the output of the integration module is the correction amount of the IGV temperature control reference.

[0044] The upper limit of the integration module is restricted by the combustion state, the waste heat boiler, and the materials of the steam turbine, etc.

[0045] The lower limit of the integration module is restricted by the combustion state.

[0046] It should be noted that dynamically adjusting the IGV temperature control reference and controlling the exhaust temperature also includes the operator manually selecting the MAN signal. When MAN is 1, the correction of the IGV temperature control reference is allowed to be enabled; when MAN is 0, the IGV temperature control reference is restored to the traditional IGV temperature control reference; when there is a problem in calculating the IGV temperature control reference correction amount or an extreme working condition occurs, the operator can set the MAN signal to 0 to cancel the correction of the IGV temperature control reference, and the IGV turbine exhaust temperature control system is restored to the traditional mode.

[0047] It should also be noted that the traditional IGV temperature control reference includes calculating the traditional IGV temperature control reference through a functional relationship using the compressor pressure ratio and the compressor exhaust temperature.

[0048] It should also be noted that dynamically adjusting the IGV temperature control reference and controlling the turbine exhaust temperature also includes summing the traditional IGV temperature control reference and the correction amount of the IGV temperature control reference to obtain the IGV temperature control reference, calculating the IGV opening command through the PID controller using the IGV temperature control reference and the average value of the actual turbine exhaust temperature, and controlling the turbine exhaust temperature at the IGV temperature control reference by adjusting the IGV opening.

[0049] It should also be noted that the integral module gradually adjusts the correction amount of the IGV temperature control reference according to the change of the unit efficiency, avoiding sudden large changes and ensuring the stability of the system; the PID controller calculates the IGV opening command according to the average value of the IGV temperature control reference and the actual turbine exhaust temperature, and controls the turbine exhaust temperature at the IGV temperature control reference by adjusting the IGV opening, realizing precise control of the turbine exhaust temperature.

[0050] It should also be noted that, as Figure 2 shown, it is the control logic diagram of the gas turbine turbine exhaust temperature control method, where U N represents the rotational speed load fuel flow reference, U T represents the turbine exhaust temperature fuel flow reference, P CD represents the compressor discharge pressure (gauge pressure), P AMB represents the atmospheric pressure, P CS represents the differential pressure across the compressor inlet filter, T CD represents the compressor discharge temperature, T EXM represents the average value of the turbine exhaust temperature, P CDA represents the compressor discharge pressure (absolute pressure), P CI represents the pressure at the inlet of the press, R CP represents the compressor pressure ratio, T EXGV0 represents the traditional IGV temperature control reference, T EXGVCOR represents the correction amount of the IGV temperature control reference, T EXGV represents the IGV temperature control reference calculated by the method proposed in the present invention, U IGV represents the IGV opening command.

[0051] It should also be noted that calculating the traditional IGV temperature control reference T EXGV0 , according to Figure 2 , the compressor pressure ratio R CP , is expressed as:

[0052] P CDA =P CD +P AMB

[0053] P CI =P AMB -P CS

[0054]

[0055] It should also be noted that by using the compressor pressure ratio R CP and the compressor exhaust gas temperature T CD , calculate the traditional IGV temperature control reference T EXGV0 :

[0056]

[0057] Embodiment 2 is the second embodiment of the present invention, which is different from the previous embodiment in that:

[0058] If the described functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that makes a contribution to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs, etc., which can store program codes of various types.

[0059] The logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions), or in combination with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device.

[0060] More specific examples (nonexhaustive list) of computer-readable media include the following: electrical connections (electronic devices) having one or more wirings, portable computer diskettes (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber devices, and portable compact disc read-only memory (CDROM). Additionally, the computer-readable media can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0061] It should be understood that the various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0062] Example 3 is the third embodiment of the present invention. This embodiment provides a system for a gas turbine turbine exhaust temperature control method, including an efficiency calculation module, a logic judgment module, and a reference correction module.

[0063] Among them, the efficiency calculation module is used to collect the operating data of the gas turbine unit and calculate the power generation efficiency of the unit in real time; the logic judgment module is used to judge whether the unit load triggers the IGV temperature control reference correction logic according to the enabling condition of the IGV temperature control reference correction; the reference correction module is used to dynamically adjust the IGV temperature control reference and control the turbine exhaust temperature based on the IGV temperature control reference correction logic.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A method for controlling the exhaust gas temperature of a gas turbine turbine, characterized in that, Including: Collect the operation data of the gas turbine unit and calculate the power generation efficiency of the unit in real time; Judge whether the unit load triggers the IGV temperature control reference correction logic according to the enabling condition of the IGV temperature control reference correction; Based on the IGV temperature control reference correction logic, dynamically adjust the IGV temperature control reference and control the turbine exhaust temperature.

2. The gas turbine turbine exhaust gas temperature control method according to claim 1, characterized in that: The operating data of the gas turbine unit includes the gas turbine fuel flow data F G and the actual load data L of the unit.

3. The gas turbine turbine exhaust gas temperature control method according to claim 2, characterized in that: The power generation efficiency of the computer group includes calculating the average fuel flow rate of a historical time window through an average value module respectively and the average power generation load of the unit The power generation efficiency E of the unit is the average value of the fuel flow rate and the average value of the power generation load of the unit The ratio is expressed as: The power generation efficiency E of the unit is delayed by the delay module to obtain the historical value E of the power generation efficiency of the unit after delay OLD .

4. The gas turbine turbine exhaust gas temperature control method according to claim 3, characterized in that: The enabling conditions for the IGV temperature control reference correction include that when the actual load L of the unit exceeds 100 MW, the flag bit S indicating that the unit has reached a certain load L is 1; The actual load L of the unit is subtracted from the average load within a historical time window. When the absolute value of the deviation is less than 3 MW and lasts for 600 s, the ON-delay module outputs S. steady as 1, indicating that the current load of the unit is stable. When the turbine exhaust temperature fuel flow reference U T Specific speed load fuel flow reference U N When it is at least 3 greater, the flag bit S indicating that the unit is in the speed load control state and there is still a certain distance from entering the temperature control U is 1; When the operator manually selects to allow the enabling of the IGV temperature control reference correction, the flag bit MAN of the operator's manual selection to allow enabling is 1; When MAN, S L , S U and S steady are all 1, the flag bit S for starting the IGV temperature control reference correction is 1, the enable port EN input of the integration module is 1, the integration module starts to work, and the correction of the IGV temperature control reference is started.

5. The gas turbine turbine exhaust gas temperature control method according to claim 4, characterized in that: The dynamically adjusting the IGV temperature control reference and controlling the turbine exhaust temperature includes dynamically adjusting the IGV temperature control reference correction amount through an integral module; When S changes from 0 to 1, the signal generation module emits a pulse signal that lasts for 60 s. Within 60 s or when E - E OLD > 0.002, the outputs of both the OR module and the inversion module are 1. The UP input terminal of the integration module is 1, and the DOWN input terminal is 0. The output terminal of the integration module gradually increases at a rate of 0.5 / min at the R input terminal (speed limit input terminal) until the unit efficiency is basically stable or the output of the integration module reaches the upper limit; The threshold range of the basic stability of the unit efficiency is expressed as: -0.002 ≤ E - E OLD ≤ 0.002 If the unit efficiency decreases as the integration module grows, when E - E OLD < - 0.002, the output of the inversion module is 0, the DOWN input terminal of the integration module is 1, the UP input terminal is 0, and the output terminal of the integration module gradually decreases at a rate of 0.5 / min at the R input terminal (speed limit input terminal) until the unit efficiency is basically stable or the output of the integration module reaches the lower limit; The output of the integral module is the correction amount of the IGV temperature control reference.

6. The gas turbine turbine exhaust gas temperature control method according to claim 5, characterized in that: The dynamically adjusting the IGV temperature control reference and controlling the turbine exhaust temperature further includes the operator manually selecting the MAN signal. When MAN is 1, the correction of the IGV temperature control reference is allowed to be enabled; When MAN is 0, the IGV temperature control reference is restored to the traditional IGV temperature control reference; When there is a problem in calculating the IGV temperature control reference correction amount or an extreme working condition occurs, the operator can set the MAN signal to 0 to cancel the correction of the IGV temperature control reference, and the IGV turbine exhaust temperature control system is restored to the traditional mode.

7. The gas turbine turbine exhaust gas temperature control method according to claim 6, characterized in that: The dynamically adjusting the IGV temperature control reference and controlling the turbine exhaust temperature further includes summing the traditional IGV temperature control reference and the correction amount of the IGV temperature control reference to obtain the IGV temperature control reference, calculating the IGV opening command through a PID controller using the IGV temperature control reference and the average value of the actual turbine exhaust temperature, and controlling the turbine exhaust temperature at the IGV temperature control reference by adjusting the IGV opening; The traditional IGV temperature control reference includes calculating the traditional IGV temperature control reference through a functional relationship using the compressor pressure ratio and the compressor exhaust temperature.

8. A system adopting the gas turbine turbine exhaust gas temperature control method described in any one of claims 1 to 7, characterized in that: Including an efficiency calculation module, a logic judgment module, and a reference correction module; The efficiency calculation module is used to collect the operation data of the gas turbine unit and calculate the power generation efficiency of the unit in real time; The logic judgment module is used to judge whether the unit load triggers the IGV temperature control reference correction logic according to the enabling condition of the IGV temperature control reference correction; The reference correction module is used to dynamically adjust the IGV temperature control reference and control the turbine exhaust temperature based on the IGV temperature control reference correction logic.

9. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it realizes the steps of the gas turbine turbine exhaust temperature control method described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it realizes the steps of the gas turbine turbine exhaust temperature control method described in any one of claims 1 to 7.

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