A bypass and steam turbine control method and system for shortening the shutdown time of a gas turbine unit

Abstract

This invention discloses a bypass and turbine control method and system for shortening the shutdown time of gas turbine units, belonging to the field of intelligent control of gas-fired combined cycle units. It includes a first control module; sequential shutdown and IGV full shutdown signals are respectively connected to the first control module, and the output of the first control module is connected to a first output command. Based on the characteristics of steam temperature change in the waste heat boiler, this invention constructs a unidirectional adjustment loop for gas turbine output. Through the linkage control of temperature drop amplitude and speed, it maintains a slow unidirectional cooling of steam temperature, ensuring thermal stability during unit shutdown. Based on the variable parameter of the turbine's comprehensive flow command reduction rate, a segmented load adjustment strategy is designed to achieve a stepped adjustment of "rapid load reduction - normal load reduction - rapid load reduction" until the turbine is disconnected.

Description

Technical Field

[0001] This invention belongs to the field of intelligent control of gas-fired steam combined cycle units, specifically relating to a bypass and turbine control method and system for shortening the downtime of gas turbine units. Background Technology

[0002] Gas-fired combined cycle (Gas-fired) turbine units are characterized by rapid start-up and shutdown, and timely load response. During the shutdown process of a conventional Gas-fired Combined Cycle (Gas-fired) turbine unit, the gas turbine load is maintained constant, and the turbine operation is gradually deactivated at a certain rate. As the main steam pressure in the waste heat boiler increases, the bypass system opens wider to maintain the required main steam pressure. Throughout the shutdown process, due to the bypass opening and the turbine valves closing, the overall energy consumption of the unit increases sharply, and the exhaust temperature of the turbine's high-pressure cylinder gradually rises as the turbine load decreases. Therefore, shortening the shutdown time of the gas turbine unit and strictly controlling the rise in the turbine's high-pressure cylinder exhaust temperature are crucial safety requirements.

[0003] This invention is based on the temperature change of the waste heat boiler steam during the smooth shutdown process of a gas turbine unit. It fully utilizes the heat storage of the waste heat boiler tube panel to rapidly reduce the steam turbine output while slowly reducing the gas turbine output, and simultaneously activates the bypass system to maintain the current main steam pressure. Specifically: 1. After the turbine starts its controlled shutdown, the gas turbine output is reduced unidirectionally based on the magnitude and rate of the decrease in the steam temperature of the waste heat boiler, so as to achieve a slow unidirectional cooling process to maintain the steam temperature at the outlet of the waste heat boiler. 2. After the turbine sequential shutdown begins, based on the variable parameter of the rate of decrease of its comprehensive flow command, the turbine load is first rapidly reduced, then the turbine load is reduced normally, and finally the turbine load is rapidly reduced again until the turbine is disconnected from the grid. 3. After the turbine's sequential shutdown begins, the bypass system will pre-open to a certain degree and switch to automatic adjustment to maintain the current main steam pressure. 4. When the bypass opening is greater than the preset opening and the exhaust temperature of the high-pressure cylinder of the steam turbine is greater than the normal value by a certain deviation, the steam turbine will automatically trigger a trip and trigger the gas turbine sequential control to continue. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a bypass and turbine control method and system for shortening the shutdown time of gas turbine units. Its main functions include: constructing a unidirectional turbine output regulation loop based on the steam temperature variation characteristics of the waste heat boiler; maintaining a slow, unidirectional cooling of the steam temperature through linkage control of the temperature drop amplitude and rate, ensuring thermal stability during unit shutdown; designing a segmented load regulation strategy based on the variable parameter of the turbine's comprehensive flow command reduction rate, achieving a stepped regulation of "rapid load reduction - normal load reduction - rapid load reduction" until the turbine is disconnected; optimizing the bypass system control logic, pre-opening the bypass and switching to automatic regulation mode at the initial stage of shutdown to accurately maintain stable main steam pressure and reduce the impact of pressure fluctuations on the unit; and constructing a safety interlock protection loop, triggering turbine tripping and gas turbine sequential shutdown through dual parameter monitoring of bypass opening degree and high-pressure cylinder exhaust temperature, ensuring safe unit shutdown.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A bypass and turbine control system for shortening the downtime of gas turbine units includes a first module; The sequential shutdown and IGV full shutdown signals are respectively connected to the first AND module, and the output of the first AND module is connected to the first output command.

[0006] A further improvement of the present invention is that it also includes a first switching module, a first constant module, a rate reduction parameter setting module, a second constant module, a second switching module, a first function curve module, and a first rate module; The current flow command, the first constant module, and the sequential stop are respectively connected to the input trigger terminal, N terminal, and Y terminal of the first switching module. The current flow command is connected to the first function curve module. The first output command, the second constant module, and the output terminal of the first function curve module are respectively connected to the input trigger terminal, N terminal, and Y terminal of the second switching module. The original rate and the output trigger of the second switching module are respectively connected to the first multiplication module. The output terminal of the first switching module and the output terminal of the first multiplication module are respectively connected to the first rate module.

[0007] A further improvement of the present invention is that the output of the first rate module is connected to the turbine flow command.

[0008] A further improvement of the present invention is that it also includes a first sub-selection module, a third constant module, and a second AND module; The high bypass value and the medium bypass value are respectively connected to the first small selection module. The output of the first small selection module and the third constant module are respectively connected to the first large selection module. The turbine stop sequence control and the output of the first large selection module are respectively connected to the second and modules.

[0009] A further improvement of the present invention is that the second output terminal of the module is connected to the second output instruction.

[0010] A further improvement of the present invention is that it also includes a third switching module, a fourth constant module, a first addition module, a fifth constant module, a second addition module, a first greater than module, and a third AND module; The sequential shutdown, current high exhaust temperature, and the output of the third switching module are respectively connected to the input trigger terminal, N terminal, and Y terminal of the third switching module. The output of the third switching module and the fourth constant module are respectively connected to the first addition module. The output of the first addition module and the fifth constant module are respectively connected to the second addition module. The current high exhaust temperature and the output of the second addition module are respectively connected to the first greater than module.

[0011] A further improvement of the present invention is that the output terminal of the first greater than module and the second output command are respectively connected to the gas turbine sequential control trip command.

[0012] A further improvement of the present invention is that it also includes a fourth switching module, a sixth constant module, a first subtraction module, a seventh constant module, an eighth constant module, a second greater than module, a fifth switching module, a ninth constant module, and a second rate module; The first output command, the current gas turbine exhaust temperature, and the output of the fourth switching module are respectively connected to the input trigger terminal, N terminal, and Y terminal of the fourth switching module. The output of the fourth switching module and the sixth constant module are respectively connected to the first subtraction module. The current main steam temperature and the eighth constant module are respectively connected to the second greater than module. The output of the second greater than module, the ninth constant module, and the output of the fifth switching module are respectively connected to the input trigger terminal, N terminal, and Y terminal of the fifth switching module. The output of the first subtraction module and the output of the fifth switching module are respectively connected to the second rate module. The output of the second rate module is connected to the gas turbine exhaust temperature.

[0013] A further improvement of the present invention is that it also includes a fourth module, wherein sequential shutdown and turbine tripping are respectively connected to the fourth module, and the output of the fourth module is connected to the gas turbine sequential tripping command.

[0014] A bypass and turbine control method for shortening the downtime of a gas turbine unit includes: When both sequential shutdown and IGV full shutdown satisfy "1", the first AND module is triggered and outputs "1", which then acts on the first output command; When the sequential shutdown is 1, the output of the first switching module is the first constant module; otherwise, the current flow command is output. When the first output command is 1, the second switching module outputs the value of the first function curve module; otherwise, the second constant module is output. The output value of the second switching module is calculated with the original deceleration rate using the first multiplication module. The calculated value is applied to the first rate module for deceleration function. The first rate module receives the value from the first switching module and calculates it to obtain the flow command to the turbine. The high bypass value and the medium bypass value are calculated by the first small selection module, and then by the third constant module and the first large selection module. When both the high bypass value and the medium bypass value are calculated by the first small selection module, the second output command outputs "1" if they are satisfied with the output of "1" for both the turbine stop and sequence control. When the current high exhaust temperature and the output value of the second small selection module are calculated using the first greater than module, and both the output of the first and second output commands are "1", then the turbine sequential control trip command is "1". The output value of the first subtraction module is applied to the second rate module. The output value of the fifth switching module is the speed-up function of the second rate module. The output value of the second rate module is the gas turbine exhaust temperature. When both the gas turbine exhaust temperature and the turbine tripping condition meet the condition of "1", the fourth AND module outputs a gas turbine sequential tripping command.

[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects: The bypass and turbine control method and system for shortening gas turbine unit shutdown time provided by this invention significantly reduces gas turbine unit shutdown time, lowers energy consumption losses during shutdown, and improves unit operating economy through segmented load regulation and bypass coordinated control. This invention effectively controls the rise in turbine high-pressure cylinder exhaust temperature by using steam temperature-linked gas turbine output regulation and high-pressure cylinder exhaust temperature interlock protection, preventing equipment damage due to overheating during shutdown and ensuring safe and stable unit shutdown. In summary, the bypass and turbine control method and system for shortening gas turbine unit shutdown time described in this invention fully utilizes the heat storage characteristics of waste heat boilers and achieves the dual goals of shortening unit shutdown time and ensuring operational safety through multi-loop coordinated control and safety interlock design. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 Schematic diagram of bypass and turbine control system for reducing downtime of gas turbine units.

[0018] Figure 2 Schematic diagram of bypass and turbine control system for shortening gas turbine unit downtime.

[0019] Figure 3 Schematic diagram of bypass and turbine control system for shortening gas turbine unit downtime.

[0020] Figure 4 Schematic diagram of bypass and turbine control system for shortening gas turbine unit downtime.

[0021] Figure 5 Schematic diagram of bypass and turbine control system for shortening gas turbine unit downtime.

[0022] Figure 6 Schematic diagram of bypass and turbine control system for shortening gas turbine unit downtime.

[0023] Figure 7 This is a rendering of an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures: 001. Sequential shutdown; 002. IGV full shutdown signal; 003. First AND module; 004. First output command; 005. Current flow command; 006. First switching module; 007. First constant module; 008. Original descent rate; 009. Descent rate parameter setting module; 010. Second constant module; 011. Second switching module; 012. First function curve module; 013. First rate module; 014. Flow command to turbine; 015. Turbine shutdown sequential control; 016. High bypass opening value; 017. Medium bypass opening value; 018. First small selection module; 019. Third constant module; 021. Second AND module; 022. Second output command; 023. Current high exhaust temperature; 024. Third switching module. Modules; 025, Fourth Constant Module; 026, First Addition Module; 027, Fifth Constant Module; 028, Second Addition Module; 029, First Greater Than Module; 030, Third AND Module; 031, Gas Turbine Sequential Control Trip Command; 032, Fourth Switching Module; 033, Current Gas Turbine Exhaust Temperature; 034, Sixth Constant Module; 035, First Subtraction Module; 036, Seventh Constant Module; 037, Current Main Steam Temperature; 038, Eighth Constant Module; 039, Second Greater Than Module; 040, Fifth Switching Module; 041, Ninth Constant Module; 042, Second Rate Module; 043, Gas Turbine Exhaust Temperature; 044, Steam Turbine Trip; 045, Fourth AND Module; 046, Gas Turbine Sequential Control Trip Command. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0034] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] Example 1 The Figure 1 Schematic diagram of bypass and turbine control system for reducing downtime of gas turbine units.

[0036] Specifically, it includes: sequential shutdown 001, IGV full shutdown signal 002, first AND module 003 and first output command 004.

[0037] The Figure 2 Schematic diagram of bypass and turbine control system for reducing downtime of gas turbine units.

[0038] Specifically, it includes: current flow command 005, first switching module 006, first constant module 007, sequential shutdown 001, original deceleration rate 008, deceleration rate parameter setting module 009, second constant module 010, second switching module 011, first function curve module 012, first rate module 013, and turbine flow command 014.

[0039] The Figure 3 Schematic diagram of bypass and turbine control system for reducing downtime of gas turbine units.

[0040] Specifically, it includes: turbine stop sequence control 015, high bypass opening value 016, medium bypass opening value 017, first small selection module 018, third constant module 019, second AND module 021, and second output instruction 022.

[0041] The Figure 4 Schematic diagram of bypass and turbine control system for reducing downtime of gas turbine units.

[0042] Specifically, it includes: current high exhaust temperature 023, third switching module 024, sequential control shutdown 001, third switching module 024, fourth constant module 025, first addition module 026, fifth constant module 027, second addition module 028, second output command 022, first greater than module 029, third AND module 030, and gas turbine sequential control trip command 031.

[0043] The Figure 5 Schematic diagram of bypass and turbine control system for reducing downtime of gas turbine units.

[0044] Specifically, it includes: fourth switching module 032, first output command 004, current gas turbine exhaust temperature 033, sixth constant module 034, first subtraction module 035, seventh constant module 036, current main steam temperature 037, eighth constant module 038, second greater than module 039, fifth switching module 040, ninth constant module 041, second rate module 042, and gas turbine exhaust temperature 043.

[0045] The Figure 6 Schematic diagram of bypass and turbine control system for reducing downtime of gas turbine units.

[0046] Specifically, it includes: sequential shutdown 001, steam turbine trip 044, fourth module 045, and gas turbine sequential trip command 046.

[0047] Figure 1 The control strategy logic diagram includes the following parts: Sequential shutdown 001 and IGV full shutdown signal 002 are respectively connected to the first AND module 003, and the output terminal of the first AND module 003 is connected to the first output command 004.

[0048] Figure 2 The control strategy logic diagram includes the following parts: The forward flow command 005, the first constant module 007, and the sequential shutdown 001 are respectively connected to the input trigger terminal, N terminal, and Y terminal of the first switching module 006. The current flow command 005 is connected to the first function curve module 012. The first output command 004, the second constant module 010, and the output terminal of the first function curve module 012 are respectively connected to the input trigger terminal, N terminal, and Y terminal of the second switching module 011. The original rate 008 and the output terminal of the second switching module 011 are respectively connected to the first multiplication module 009. The output terminal of the first switching module 006 and the output terminal of the first multiplication module 009 are respectively connected to the first rate module 013. The output terminal of the first rate module 013 is connected to the turbine flow command 014.

[0049] Figure 3 The control strategy logic diagram includes the following parts: The high bypass value 016 and the medium bypass value 017 are respectively connected to the first small selection module 018. The output of the first small selection module 018 and the third constant module 019 are respectively connected to the first large selection module 020. The turbine stop sequence control 015 and the output of the first large selection module 020 are respectively connected to the second AND module 021. The output of the second AND module 021 is connected to the second output command 022.

[0050] Figure 4 The control strategy logic diagram includes the following parts: The sequential shutdown 001, the current high exhaust temperature 023, and the output of the third switching module 024 are respectively connected to the input trigger terminal, N terminal, and Y terminal of the third switching module 024. The output of the third switching module 024 and the fourth constant module 025 are respectively connected to the first addition module 026. The output of the first addition module 026 and the fifth constant module 027 are respectively connected to the second addition module 028. The current high exhaust temperature 023 and the output of the second addition module 028 are respectively connected to the first greater than module 029. The output of the first greater than module 029 and the second output command 022 are respectively connected to the gas turbine sequential trip command 031.

[0051] Figure 5 The control strategy logic diagram includes the following parts: The first output command 004, the current gas turbine exhaust temperature 033, and the output of the fourth switching module 032 are respectively connected to the input trigger terminal, N terminal, and Y terminal of the fourth switching module 032. The output of the fourth switching module 032 and the sixth constant module 034 are respectively connected to the first subtraction module 035. The current main steam temperature 037 and the eighth constant module 038 are respectively connected to the second greater than module 039. The output of the second greater than module 039, the ninth constant module 041, and the output of the fifth switching module 040 are respectively connected to the input trigger terminal, N terminal, and Y terminal of the fifth switching module 040. The output of the first subtraction module 035 and the output of the fifth switching module 040 are respectively connected to the second rate module 042. The output of the second rate module 042 is connected to the gas turbine exhaust temperature 043.

[0052] Figure 6 The control strategy logic diagram includes the following parts: Sequential shutdown 001 and turbine trip 044 are respectively connected to the fourth control module 045, and the output of the fourth control module 045 is connected to the gas turbine sequential trip command 046.

[0053] Example 2 This invention provides a bypass and turbine control method for shortening the downtime of gas turbine units, comprising: When both sequential shutdown 001 and IGV full shutdown 002 satisfy "1", the first AND module 003 is triggered and outputs "1", which then acts on the first output instruction 004.

[0054] When the sequential shutdown 001 is 1, the output of the first switching module 006 is the first constant module 007; otherwise, the current flow command 005 is output. When the first output command 004 is 1, the second switching module 011 outputs the value of the first function curve module 012; otherwise, the second constant module 010 is output. The output value of the second switching module 011 and the original deceleration rate 008 are calculated using the first multiplication module 009. The calculated value is applied to the first rate module 013 for deceleration function. The first rate module 013 receives the value of the first switching module 006 and calculates it to obtain the turbine flow command 014.

[0055] The high bypass value 016 and the medium bypass value 017 are calculated by the first small selection module 018, and then by the third constant module 019 and the first large selection module 020. When both the high bypass value 016 and the medium bypass value 017 are calculated, the second output instruction 022 outputs "1".

[0056] When the current high exhaust temperature 023 and the output value of the second small selection module 028 are calculated by the first greater than module 029, and both the output value and the output value of the second output instruction 022 are "1", then the turbine sequential control trip instruction 031 is "1".

[0057] The output value of the first subtraction module 035 is applied to the second rate module 042. The output value of the fifth switching module 040 is the speed-up function of the second rate module 042. The output value of the second rate module 042 is the gas turbine exhaust temperature 043.

[0058] When both the gas turbine exhaust temperature 043 and the turbine trip 044 satisfy "1", the fourth AND module 045 outputs the gas turbine sequential trip command 046.

[0059] The present invention is applicable to the following scenarios: (1) When the turbine is shut down in sequence, the rate of reduction needs to be dynamically adjusted according to the current flow command to achieve the scenario of “rapid-normal-rapid” segmented load reduction. This is particularly suitable for gas-steam combined cycle units that need to shorten the shutdown time and ensure the stability of turbine load regulation.

[0060] (2) Applicable to scenarios where the bypass system needs to be pre-opened in the early stage of shutdown to maintain the stability of the main steam pressure. It is suitable for units where the main steam pressure of the waste heat boiler is sensitive to fluctuations and the bypass system has high adjustment response requirements. It can avoid the main steam pressure exceeding the standard due to the delay in bypass opening.

[0061] (3) It is applicable to safety protection scenarios where the exhaust temperature of the high-pressure cylinder of the steam turbine needs to be strictly monitored during the shutdown process to prevent overheating damage to the equipment. It is especially applicable to units where the exhaust temperature of the high-pressure cylinder is easy to rise. The reliability of the trip command is ensured by dual-parameter interlocking (exhaust temperature + bypass opening).

[0062] (4) Applicable to scenarios where the exhaust gas temperature and main steam temperature of the gas turbine need to be controlled in coordination during shutdown. It is suitable for units with high requirements for the linkage regulation of flue gas temperature and steam temperature. It can ensure the reasonable utilization of waste heat boiler tube screen heat storage and avoid excessive temperature fluctuations that affect equipment life.

[0063] (5) It is applicable to interlocking scenarios where the gas turbine needs to be synchronously triggered to stop after the steam turbine trips. It is applicable to scenarios with high requirements for unit shutdown coordination and can avoid energy waste and equipment safety risks caused by the gas turbine continuing to run after the steam turbine trips.

[0064] (6) Applicable to normal sequential shutdown scenarios of various gas-fired steam combined cycle units, especially suitable for units with strict requirements on shutdown duration, energy consumption control, and equipment safety (stable exhaust temperature and pressure), which can significantly improve the economy and safety of the unit shutdown process.

[0065] Example 3 like Figure 7As shown, through the implementation and application of the technology of this invention in the unit coordinated control process, the unit load ranges from 247MW to 587MW. This includes: 1. Gas turbine exhaust temperature (300-600℃); 2. High-pressure main steam temperature (300-600℃); 3. High-pressure regulating valve opening (0-120%); 4. Active power (-20-600MW); 5. IGV opening feedback (0-100%). When the IGV opening is fully closed, the high-pressure regulating valve closes, the gas turbine exhaust temperature decreases, and the main steam temperature decreases accordingly, thereby reducing active power and shutting down the unit.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A bypass and turbine control system for shortening the downtime of a gas turbine unit, characterized in that, Including the first module (003); Sequential shutdown (001) and IGV full shutdown signal (002) are respectively connected to the first AND module (003), and the output terminal of the first AND module (003) is connected to the first output command (004).

2. The bypass and turbine control system for shortening the downtime of a gas turbine unit according to claim 1, characterized in that, It also includes a first switching module (006), a first constant module (007), a rate setting module (009), a second constant module (010), a second switching module (011), a first function curve module (012), and a first rate module (013); The current flow command (005), the first constant module (007), and the sequential stop (001) are respectively connected to the input trigger terminal, N terminal, and Y terminal of the first switching module (006). The current flow command (005) is connected to the first function curve module (012). The output terminals of the first output command (004), the second constant module (010), and the first function curve module (012) are respectively connected to the input trigger terminal, N terminal, and Y terminal of the second switching module (011). The original rate reduction (008) and the output terminal of the second switching module (011) are respectively connected to the first multiplication module (009). The output terminal of the first switching module (006) and the output terminal of the first multiplication module (009) are respectively connected to the first rate module (013).

3. A bypass and turbine control system for shortening the downtime of a gas turbine unit according to claim 2, characterized in that, The output of the first rate module (013) is connected to the turbine flow command (014).

4. A bypass and turbine control system for shortening the downtime of a gas turbine unit according to claim 3, characterized in that, It also includes a first sub-select module (018), a third constant module (019), and a second AND module (021); The high bypass value (016) and the medium bypass value (017) are respectively connected to the first small selection module (018), the output of the first small selection module (018) and the third constant module (019) are respectively connected to the first large selection module (020), and the output of the turbine stop sequence control (015) and the first large selection module (020) are respectively connected to the second and module (021).

5. A bypass and turbine control system for shortening the downtime of a gas turbine unit according to claim 4, characterized in that, The output terminal of the second AND module (021) is connected to the second output instruction (022).

6. A bypass and turbine control system for shortening the downtime of a gas turbine unit according to claim 5, characterized in that, It also includes a third switching module (024), a fourth constant module (025), a first addition module (026), a fifth constant module (027), a second addition module (028), a first greater than module (029), and a third AND module (030); The sequential shutdown (001), the current high exhaust temperature (023), and the output of the third switching module (024) are respectively connected to the input trigger terminal, N terminal, and Y terminal of the third switching module (024). The output of the third switching module (024) and the fourth constant module (025) are respectively connected to the first addition module (026). The output of the first addition module (026) and the fifth constant module (027) are respectively connected to the second addition module (028). The current high exhaust temperature (023) and the output of the second addition module (028) are respectively connected to the first greater than module (029).

7. A bypass and turbine control system for shortening the downtime of a gas turbine unit according to claim 6, characterized in that, The output terminal of the first greater module (029) and the second output command (022) are respectively connected to the gas turbine sequential control trip command (031).

8. A bypass and turbine control system for shortening the downtime of a gas turbine unit according to claim 7, characterized in that, It also includes a fourth switching module (032), a sixth constant module (034), a first subtraction module (035), a seventh constant module (036), an eighth constant module (038), a second greater than module (039), a fifth switching module (040), a ninth constant module (041), and a second rate module (042); The first output command (004), the current gas turbine exhaust temperature (033), and the output of the fourth switching module (032) are respectively connected to the input trigger terminal, N terminal, and Y terminal of the fourth switching module (032). The output of the fourth switching module (032) and the sixth constant module (034) are respectively connected to the first subtraction module (035). The current main steam temperature (037) and the eighth constant module (038) are respectively connected to the second greater than module (039). The output of the second greater than module (039), the ninth constant module (041), and the output of the fifth switching module (040) are respectively connected to the input trigger terminal, N terminal, and Y terminal of the fifth switching module (040). The output of the first subtraction module (035) and the output of the fifth switching module (040) are respectively connected to the second rate module (042). The output of the second rate module (042) is connected to the gas turbine exhaust temperature (043).

9. A bypass and turbine control system for shortening the downtime of a gas turbine unit according to claim 8, characterized in that, It also includes a fourth AND module (045), with sequential shutdown (001) and turbine trip (044) respectively connected to the fourth AND module (045), and the output of the fourth AND module (045) connected to the gas turbine sequential trip command (046).

10. A bypass and turbine control method for shortening the downtime of a gas turbine unit, characterized in that, This method is based on the bypass and turbine control system for shortening the downtime of a gas turbine unit as described in claim 9, comprising: When both sequential shutdown (001) and IGV full shutdown (002) satisfy "1", the first AND module (003) is triggered and outputs "1", which is then applied to the first output instruction (004). When the sequential shutdown (001) is 1, the output of the first switching module (006) is the first constant module (007); otherwise, the current flow command (005) is output. When the first output command (004) is 1, the second switching module (011) outputs the value of the first function curve module (012); otherwise, the second constant module (010) is output. The output value of the second switching module (011) and the original deceleration rate (008) are calculated by the first multiplication module (009). The calculated value is applied to the first rate module (013) to perform the deceleration rate function. The first rate module (013) receives the value of the first switching module (006) and calculates it to obtain the turbine flow command (014). After the high bypass value (016) and the medium bypass value (017) are calculated by the first small selection module (018), and then by the third constant module (019) and the first large selection module (020), the values ​​must be such that both the steam turbine stop sequence control (015) and the steam turbine stop sequence control (015) output "1". Then the second output instruction (022) outputs "1". When the current high exhaust temperature (023) and the output value of the second small selection module (028) are calculated by the first greater than module (029), and both the output of the second output instruction (022) and the output of the second output instruction (022) are "1", then the turbine sequential control trip instruction (031) is "1". The output value of the first subtraction module (035) is applied to the second rate module (042), the output value of the fifth switching module (040) is the speed-up function of the second rate module (042), and the output value of the second rate module (042) is the exhaust gas temperature of the gas turbine (043). When both the gas turbine exhaust temperature (043) and the steam turbine trip (044) satisfy "1", the fourth AND module (045) outputs the gas turbine sequential trip command (046).

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