A method and system for differential control of secondary steam temperature process signals

Abstract

The application discloses a kind of secondary steam temperature process signal differential control method and system, utilize first subtracter to carry out subtraction operation to secondary steam temperature process signal and the second integrator output second integral signal, obtain feedback output signal;Utilize first integrator to integrate feedback output signal, obtain first integral signal;Utilize second integrator to integrate first integral signal, obtain second integral signal;Utilize first addition module to process first integral signal, obtain first superimposed signal;Second superimposed signal is obtained by using second addition module to process second integral signal;Utilize second subtracter to subtract first superimposed signal and second superimposed signal, obtain first subtraction signal, utilize fixed proportion controller to obtain fixed proportion control signal;Utilize third adder to superimpose secondary steam temperature process signal and fixed proportion control signal, obtain fixed proportion fastest tracking differential signal.The embodiment of the application provides a kind of secondary steam temperature process signal differential control method and system, improve the output tracking input differential tracking efficiency of secondary steam temperature process signal.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of industrial process control, in particular to a differential control method and system for secondary steam temperature process signals. BACKGROUND

[0002] In the field of industrial process control, especially in the control process of thermal power generating units, the secondary steam temperature process control system is an important part of the control of thermal power generating units. In the control process of secondary steam temperature, the secondary steam temperature process signal usually needs to be predicted in advance. The performance of the advance prediction is determined by the differential tracking performance of the differentiator. The common differentiator based on the first-order inertia filter is an exponential mechanism-based differentiator, which has low differential tracking efficiency and needs to be improved in mechanism. Therefore, there is an urgent need for a differential control strategy for secondary steam temperature process signals to solve the problem of low differential tracking efficiency of the output of the secondary steam temperature process signal. SUMMARY

[0003] The embodiments of the present application provide a differential control method and system for secondary steam temperature process signals to improve the differential tracking efficiency of the output of the secondary steam temperature process signal.

[0004] To solve the above problems, an embodiment of the present application provides a differential control method for secondary steam temperature process signals, which is applied to a fixed proportional fastest tracking differentiator. The fixed proportional fastest tracking differentiator comprises a first subtracter, a first integrator, a second integrator, a first addition module, a second addition module, a second subtracter, a fixed proportional controller and a third adder. The method comprises the following steps:

[0005] obtaining a secondary steam temperature process signal of a thermal power generating unit;

[0006] using the first subtracter, performing subtraction operation on the secondary steam temperature process signal and a second integral signal output by the second integrator to obtain a feedback output signal corresponding to the secondary steam temperature process signal;

[0007] using the first integrator, receiving the feedback output signal and obtaining a first integral signal corresponding to the feedback output signal through integral operation;

[0008] using the second integrator, receiving the first integral signal and obtaining a second integral signal corresponding to the first integral signal through integral operation;

[0009] using the first addition module, receiving the first integral signal and obtaining a first superimposed signal corresponding to the first integral signal;

[0010] using the second addition module, receiving the second integral signal and obtaining a second superimposed signal corresponding to the second integral signal;

[0011] The second subtractor receives the first superimposed signal and the second superimposed signal, and obtains a first subtraction signal through subtraction operation;

[0012] The fixed proportion controller receives the first subtraction signal, and obtains a fixed proportion control signal;

[0013] The third adder receives the secondary steam temperature process signal and the fixed proportion control signal, and obtains a fixed proportion fastest tracking differential signal corresponding to the secondary steam temperature process signal through addition operation.

[0014] As an improvement of the above scheme, the first adder module comprises a first delay device and a first adder; the first adder module receives the first integral signal, and obtains a first superimposed signal corresponding to the first integral signal, comprising:

[0015] The first delay device receives the first integral signal, and obtains a first delay signal through delay operation;

[0016] The first adder receives the first integral signal and the first delay signal, and obtains a first superimposed signal through addition operation.

[0017] As an improvement of the above scheme, the second adder module comprises a second delay device and a second adder; the second adder module receives the second integral signal, and obtains a second superimposed signal corresponding to the second integral signal, comprising:

[0018] The second delay device receives the second integral signal, and obtains a second delay signal through delay operation;

[0019] The second adder receives the second integral signal and the second delay signal, and obtains a second superimposed signal through addition operation.

[0020] As an improvement of the above scheme, the first integrator comprises:

[0021]

[0022] In the formula, f FI (s) is the Laplace transfer function of the first integrator; T T is the integral time constant, and the unit is s.

[0023] As an improvement of the above scheme, the second integrator comprises:

[0024]

[0025] In the formula, f SI(s) is the Laplace transfer function of the second integrator; T T is the integral time constant, unit: s.

[0026] As an improvement of the above scheme, the first delay device comprises:

[0027]

[0028] wherein, f L:A (s) is the Laplace transfer function of the first delay device; T F:A is the delay time constant of the first delay device, unit: s; T F:A = T T .

[0029] As an improvement of the above scheme, the second delay device comprises:

[0030]

[0031] wherein, f L:A (s) is the Laplace transfer function of the second delay device; T F:A is the delay time constant of the second delay device, unit: s; T F:A = T T .

[0032] As an improvement of the above scheme, the proportional gain input value of the fixed proportional controller is 0.5.

[0033] Correspondingly, an embodiment of the present application further provides a differential control system of a secondary steam temperature process signal, comprising: a thermal power generating unit, a data acquisition device and a fixed proportional maximum speed tracking differentiator; wherein the fixed proportional maximum speed tracking differentiator applies the differential control method of the secondary steam temperature process signal as described in the present application.

[0034] The thermal power generating unit is used for generating a secondary steam temperature process signal.

[0035] The data acquisition device is used for acquiring the secondary steam temperature process signal and transmitting the secondary steam temperature process signal to the fixed proportional maximum speed tracking differentiator.

[0036] The fixed proportional maximum speed tracking differentiator is used for receiving the secondary steam temperature process signal and generating a fixed proportional maximum speed tracking differential signal corresponding to the secondary steam temperature process signal.

[0037] As an improvement of the above scheme, the fixed proportional maximum speed tracking differentiator comprises:

[0038]

[0039] TT = T L:A = T L:B

[0040] wherein f NFTD (s) is the Laplace transfer function of the fixed proportional derivative tracker; T T is an integral time constant, with the unit of s; T L:A、 T L:B are the time constants of the first and second delay units of the fixed proportional derivative tracker, respectively, with the unit of s.

[0041] Correspondingly, an embodiment of the present application further provides a computer terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the secondary steam temperature process signal differential control method when executing the computer program.

[0042] Correspondingly, an embodiment of the present application further provides a computer readable storage medium, comprising a stored computer program, wherein the computer readable storage medium controls a device where the computer readable storage medium is located to execute the secondary steam temperature process signal differential control method when the computer program runs.

[0043] From the above, the present application has the following beneficial effects:

[0044] The application provides a differential control method for a secondary steam temperature process signal, after a secondary steam temperature process signal of a thermal power generating unit is acquired, a first subtracter is used to perform subtraction operation on the secondary steam temperature process signal and a second integral signal output by a second integrator to obtain a feedback output signal; a first integrator is used to perform integral operation on the feedback output signal to obtain a first integral signal; the second integrator is used to perform integral operation on the first integral signal to obtain the second integral signal; a first addition module is used to process the first integral signal to obtain a first superimposed signal; a second addition module is used to process the second integral signal to obtain a second superimposed signal; a second subtracter is used to perform subtraction operation on the first superimposed signal and the second superimposed signal to obtain a first subtraction signal, a fixed proportional controller is used to perform proportional control output on the first subtraction signal to obtain a fixed proportional control signal; and a third adder is used to perform superimposed operation on the secondary steam temperature process signal and the fixed proportional control signal to obtain a fixed proportional fastest tracking differential signal of the secondary steam temperature process signal. Through processing the first integral signal and the second integral signal corresponding to the secondary steam temperature process signal, performing subtraction operation on the first superimposed signal corresponding to the first integral signal and the second superimposed signal corresponding to the second integral signal, outputting the subtraction operation result at a fixed proportion to obtain the fixed proportional control signal, and combining the fixed proportional control signal with the secondary steam temperature process signal, the differential result of the secondary steam temperature process signal is finally obtained. Based on the above processing, the differential tracking efficiency of the secondary steam temperature process signal can be improved, the acquisition of the differential result is accelerated, and the lead observation performance of the secondary steam temperature process signal of the thermal power generating unit is improved based on the obtained differential result. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a flowchart of a differential control method for a secondary steam temperature process signal provided by an embodiment of the application;

[0046] Figure 2 is a structure diagram of a fixed proportional fastest tracking differentiator provided by an embodiment of the application;

[0047] Figure 3 is a structure diagram of a differential control system for a secondary steam temperature process signal provided by an embodiment of the application;

[0048] Figure 4 is an output diagram of a first adder provided by an embodiment of the application;

[0049] Figure 5 is an output diagram of a second adder provided by an embodiment of the application;

[0050] Figure 6 is an output diagram of a fixed proportional controller provided by an embodiment of the application;

[0051] Figure 7 is a schematic diagram of the output comparison of a common differentiator and a fixed proportional fastest tracking differentiator provided by an embodiment of the present application.

[0052] Figure 8 is a schematic diagram of a terminal device structure provided by an embodiment of the present application. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0054] Embodiment one

[0055] Reference is made to Figure 1 , Figure 1 is a flowchart of a differential control method of a secondary steam temperature process signal provided by an embodiment of the present application, as shown in the figure, the embodiment includes steps 101 to 108, and each step is specifically as follows: Figure 1 The fixed proportional fastest tracking differentiator includes a first subtracter 201, a first integrator 202, a second integrator 203, a first addition module 204, a second addition module 205, a second subtracter 206, a fixed proportional controller 207, and a third adder 208.

[0056] Step 101: Obtain a secondary steam temperature process signal of a thermal power generating unit.

[0057] In the embodiment, by collecting secondary steam temperature data of the thermal power generating unit, the secondary steam temperature data is converted into a secondary steam temperature process signal based on the secondary steam temperature data.

[0058] Step 102: Use the first subtracter to perform subtraction operation on the secondary steam temperature process signal and a second integral signal output by the second integrator, to obtain a feedback output signal corresponding to the secondary steam temperature process signal.

[0059] In the embodiment, the minuend end of the first subtracter is used to receive the secondary steam temperature process signal, and the subtrahend end is used to receive the second integral signal output by the second integrator.

[0060] In a specific embodiment, the result output by the second integrator is input to the subtrahend end of the first subtracter, to form a closed-loop feedback.

[0061]

[0062] ​Step 103: receiving the feedback output signal by the first integrator, and obtaining a first integral signal corresponding to the feedback output signal by integral operation.

[0063] In the embodiment, the first integrator comprises:

[0064]

[0065] wherein, f FI (s) is a Laplace transfer function of the first integrator; T T is an integral time constant, and the unit is s.

[0066] Step 104: receiving the first integral signal by the second integrator, and obtaining a second integral signal corresponding to the first integral signal by integral operation.

[0067] In the embodiment, the second integrator comprises:

[0068]

[0069] wherein, f SI (s) is a Laplace transfer function of the second integrator; T T is an integral time constant, and the unit is s.

[0070] Step 105: receiving the first integral signal by the first adding module, and obtaining a first superposition signal corresponding to the first integral signal.

[0071] In the embodiment, the first adding module comprises a first delayer 209 and a first adder 210; and the receiving the first integral signal by the first adding module and obtaining the first superposition signal corresponding to the first integral signal comprises:

[0072] receiving the first integral signal by the first delayer and obtaining a first delay signal by delay operation;

[0073] receiving the first integral signal and the first delay signal by the first adder and obtaining the first superposition signal by addition operation.

[0074] In the embodiment, the first delayer comprises:

[0075]

[0076] wherein, f L:A (s) is a Laplace transfer function of the first delayer; T F:A is a delay time constant of the first delayer, and the unit is s; T F:A =TT .

[0077] In a specific embodiment, T T = T L:A = 100 s, and the output PV FA (t) of the first adder is obtained. Figure 4 as shown.

[0078] Step 106: receiving the second integral signal by using the second adder module to obtain a second superimposed signal corresponding to the second integral signal.

[0079] In this embodiment, the second adder module includes a second delay unit 211 and a second adder 212; and the receiving the second integral signal by using the second adder module to obtain a second superimposed signal corresponding to the second integral signal includes:

[0080] receiving the second integral signal by using the second delay unit to obtain a second delay signal through a delay operation;

[0081] receiving the second integral signal and the second delay signal by using the second adder to obtain a second superimposed signal through an addition operation.

[0082] In this embodiment, the second delay unit includes:

[0083]

[0084] wherein f L:A (s) is the Laplace transfer function of the second delay unit; T F:A is the time constant of the second delay unit, and the unit is s; T F:A = T T .

[0085] In a specific embodiment, T T = T L:B = 100 s, and the output PV SA (t) of the second adder is obtained. Figure 5 as shown.

[0086] Step 107: receiving the first superimposed signal and the second superimposed signal by using the second subtractor to obtain a first subtraction signal through a subtraction operation.

[0087] In this embodiment, the minuend of the second subtractor is used to receive the first superimposed signal, and the subtrahend of the second subtractor is used to receive the second superimposed signal.

[0088] Step 108: receiving the first subtraction signal by using the fixed ratio controller to obtain a fixed ratio control signal.

[0089] In the embodiment, the proportional gain input value of the fixed proportional controller is 0.5.

[0090] In a specific embodiment, when T T = T L:A = T L:B = 100s, the output PV C (t) of the fixed proportional controller (0.5) is obtained. T Figure 6 as shown in the figure.

[0091] Step 109: receiving the secondary steam temperature process signal and the fixed proportional control signal by using the third adder, and obtaining the fixed proportional fastest tracking differential signal corresponding to the secondary steam temperature process signal through addition operation.

[0092] Referring to Figure 3 , Figure 3 is a structure diagram of a differential control system of a secondary steam temperature process signal provided by an embodiment of the application, comprising: a thermal power generating unit 301, a data acquisition device 302, and a fixed proportional fastest tracking differentiator 303; wherein the fixed proportional fastest tracking differentiator applies the differential control method of the secondary steam temperature process signal as described in the application.

[0093] As an improvement of the above-mentioned scheme, the fixed proportional fastest tracking differentiator 303 comprises:

[0094]

[0095] T T = T L:A = T L:B

[0096] In the formula, f NFTD (s) is the Laplace transfer function of the fixed proportional fastest tracking differentiator; T T is an integral time constant, with the unit of s; T L:A , T L:B are the time delay constants of the first time delay device and the second time delay device of the fixed proportional fastest tracking differentiator, respectively, with the unit of s.

[0097] In a specific embodiment, for better illustration, the following examples are given:

[0098] When the gain is 1, the expression of the commonly used differentiator is:

[0099] f CD (s) = 1-f FOIF (s)

[0100]

[0101] In the formula, f CD (s) is the Laplace transfer function of the commonly used differentiator; f FOIF (s) is the Laplace transfer function of the first-order inertial filter; T FOIF Let be the filtering time constant of the first-order inertial filter, in seconds;

[0102] Set T T =100s, T L:A =T L:B =T T =100s, T FOIF =100s, the input signal is a unit step, and the process output PV of the fixed proportional fastest tracking differentiator is obtained. NFTD (t), the process output PV of the commonly used differentiator CD (t), such as Figure 7 As shown.

[0103] Depend on Figure 7 It can be seen that when t>100s, the differential output of the fixed-proportion fastest-tracking differentiator has tracked the input, while the output of the conventional differentiator tracks to 61% of the input. Similarly, when the differential output tracks to 61% of the input, the conventional differentiator requires 100s, while the fixed-proportion fastest-tracking differentiator only requires 80s. Compared to the conventional differentiator, the fixed-proportion fastest-tracking differentiator has a higher cutoff speed, improving the differential tracking efficiency, indicating that the differential performance of the fixed-proportion fastest-tracking differentiator is superior to that of the conventional differentiator.

[0104] In this embodiment, after acquiring the secondary steam temperature process signal of the thermal power unit, a first subtractor is used to subtract the secondary steam temperature process signal from the second integral signal output by the second integrator to obtain a feedback output signal; the first integrator is used to integrate the feedback output signal to obtain a first integral signal; the second integrator is used to integrate the first integral signal to obtain a second integral signal; a first adder is used to process the first integral signal to obtain a first superimposed signal; a second adder is used to process the second integral signal to obtain a second superimposed signal; a second subtractor is used to subtract the first superimposed signal from the second superimposed signal to obtain a first subtracted signal; a fixed proportional controller is used to proportionally control the first subtracted signal to obtain a fixed proportional control signal; a third adder is used to superimpose the secondary steam temperature process signal and the fixed proportional control signal to obtain a fixed proportional steepest tracking differential signal of the secondary steam temperature process signal. This embodiment can improve the steepest differential performance, and by using a fixed proportional steepest tracking differential, it improves the forward observation performance of the secondary steam temperature control, thereby enhancing the performance of the secondary steam temperature control system.

[0105] Example 2

[0106] Referring to Figure 8 , Figure 8 is a schematic diagram of a terminal device structure provided by an embodiment of the present application.

[0107] The terminal device of this embodiment comprises a processor 801, a memory 802, and a computer program stored in the memory 802 and executable on the processor 801. The processor 801 implements the steps of the differential control method of the secondary steam temperature process signal in the embodiments when executing the computer program, for example, all the steps of the differential control method of the secondary steam temperature process signal as shown in the above embodiment. Figure 1 Alternatively, the processor implements the functions of the modules in the above device embodiments when executing the computer program, for example, all the modules of the differential control device of the secondary steam temperature process signal as shown in the above embodiment. Figure 3

[0108] In addition, an embodiment of the present application further provides a computer readable storage medium, which comprises a stored computer program, wherein when the computer program is executed, the device where the computer readable storage medium is located performs the differential control method of the secondary steam temperature process signal according to any one of the above embodiments.

[0109] Those skilled in the art can understand that the schematic diagram is only an example of the terminal device and does not limit the terminal device, which can comprise more or less components than the diagram, or combine certain components, or different components, for example, the terminal device can further comprise an input and output device, a network access device, a bus, etc.

[0110] The processor 801 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The processor 801 is the control center of the terminal device, which connects all parts of the terminal device through various interfaces and lines.

[0111] ​The memory 802 can be used to store the computer programs and / or modules, and the processor 801 realizes various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory 802. The memory 802 can mainly include a program storage area and a data storage area, wherein the program storage area can store operating systems, at least one application program required by a function (such as a sound playing function, an image playing function, etc.), etc.; and the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a nonvolatile memory, for example, a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state memory devices.

[0112] When the modules / units integrated in the terminal device are realized 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 this understanding, all or part of the processes in the above-mentioned embodiment methods can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. When the processor executes the computer program, the steps of the above-mentioned various method embodiments can be realized. The computer program includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms, etc. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0113] It should be noted that the apparatus embodiments described above are merely illustrative, and the units described as separate units can or can not be physically separate, and the units shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. In addition, the connection relationship between the modules in the apparatus embodiment provided by the present application indicates that there is a communication connection between them, which can be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement it without creative labor.

[0114] The above is the preferred embodiment of the present application. It should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements are also considered within the scope of protection of the present application.

Claims

1. A differential control method for a secondary steam temperature process signal, characterized in that, An application is made to a fixed-proportion steepest-tracking differentiator, the fixed-proportion steepest-tracking differentiator comprising: a first subtractor, a first integrator, a second integrator, a first adder module, a second adder module, a second subtractor, a fixed-proportion controller, and a third adder; the method comprises: Acquire the secondary steam temperature process signal of the thermal power unit; Using the first subtractor, a subtraction operation is performed on the secondary steam temperature process signal and the second integral signal output by the second integrator to obtain the feedback output signal corresponding to the secondary steam temperature process signal. Using the first integrator, the feedback output signal is received, and the first integral signal corresponding to the feedback output signal is obtained through integration. Using the second integrator, the first integral signal is received, and the second integral signal corresponding to the first integral signal is obtained through integration. Using the first addition module, the first integral signal is received to obtain a first superimposed signal corresponding to the first integral signal; the first addition module includes: a first delay unit and a first adder; the step of using the first addition module to receive the first integral signal and obtain the first superimposed signal corresponding to the first integral signal includes: using the first delay unit to receive the first integral signal and obtaining a first delayed signal through a delay operation; using the first adder to receive the first integral signal and the first delayed signal and obtain the first superimposed signal through an addition operation; The second addition module is used to receive the second integral signal and obtain a second superimposed signal corresponding to the second integral signal. The second addition module includes a second delay unit and a second adder. The step of using the second addition module to receive the second integral signal and obtain the second superimposed signal corresponding to the second integral signal includes: using the second delay unit to receive the second integral signal and obtaining a second delayed signal through a delay operation; using the second adder to receive the second integral signal and the second delayed signal and obtain the second superimposed signal through an addition operation. Using the second subtractor, the first superimposed signal and the second superimposed signal are received, and the first subtraction signal is obtained through subtraction operation; Using the fixed ratio controller, the first subtraction signal is received to obtain a fixed ratio control signal; Using the third adder, the secondary steam temperature process signal and the fixed proportional control signal are received, and the fixed proportional steepest tracking differential signal corresponding to the secondary steam temperature process signal is obtained through addition; the fixed proportional steepest tracking differential includes: T T =T L:A =T L:B In the formula, f NFTD (s) is the Laplace transfer function of the fixed-proportion fastest-tracking differentiator; T T T is the integration time constant, in seconds. L:A T L:B These are the delay time constants of the first and second delay units of the fixed-proportion fastest tracking differentiator, respectively, in seconds.

2. The differential control method for the secondary steam temperature process signal according to claim 1, characterized in that, The first integrator includes: In the formula, f FI (s) is the Laplace transfer function of the first integrator; T T is the integration time constant, in seconds.

3. The differential control method for the secondary steam temperature process signal according to claim 1, characterized in that, The second integrator includes: In the formula, fSI(s) is the Laplace transfer function of the second integrator; TT is the integration time constant, in seconds.

4. The differential control method for the secondary steam temperature process signal according to claim 2, characterized in that, The first delay unit includes: In the formula, f L:A (s) is the Laplace transfer function of the first delay; T F:A T is the delay time constant of the first delay unit, in seconds; F:A =T T .

5. The differential control method for the secondary steam temperature process signal according to claim 1, characterized in that, The second delay unit includes: In the formula, f L:A (s) is the Laplace transfer function of the second delay; T F:A T is the delay time constant of the second delay unit, in seconds. F:A =T T .

6. The differential control method for the secondary steam temperature process signal according to claim 1, characterized in that, The proportional gain input value of the fixed proportional controller is 0.

5.

7. A differential control system for a secondary steam temperature process signal, characterized in that, include: Thermal power unit equipment, data acquisition device, and fixed proportional maximum speed tracking differentiator; wherein, the fixed proportional maximum speed tracking differentiator applies the differential control method for the secondary steam temperature process signal as described in any one of claims 1 to 6; The thermal power unit is used to generate secondary steam temperature process signals; The data acquisition device is used to acquire the secondary steam temperature process signal and transmit the secondary steam temperature process signal to the fixed ratio fastest tracking differentiator. The fixed-proportion fastest tracking differentiator is used to receive the secondary steam temperature process signal and generate a fixed-proportion fastest tracking differentiator signal corresponding to the secondary steam temperature process signal.

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