Process signal accelerator, acceleration observation method and reheater steam temperature control system

Abstract

The present application discloses a process signal accelerator, an acceleration observation method, and a reheat steam temperature control system. The accelerator includes a forward acceleration unit, a negative acceleration unit, and an output adder; the forward acceleration unit is configured to perform forward acceleration on an input signal to generate a forward acceleration signal; the negative acceleration unit is configured to perform negative acceleration on the input signal to generate a negative acceleration signal; the output adder is configured to add the forward acceleration signal and the negative acceleration signal to generate an output signal. The process signal accelerator provided by the present application realizes two-way acceleration observation of the forward acceleration unit and the negative acceleration unit through a positive feedback link, realizes the advance output of the control quantity during the control process, thereby improving the acceleration effect. At the same time, applying this process signal accelerator to the construction of the reheat steam temperature control system of a thermal power unit can help suppress the deviation of the reheat steam temperature and ultimately enhance the control effect.

Description

Technical Field

[0001] The present application relates to the field of process control of thermal power units, and particularly to a process signal accelerator, an acceleration observation method, and a reheat steam temperature control system. Background Art

[0002] In the field of industrial process control, especially in the field of process control of thermal power units, lead observation plays an important role in improving process control performance. Various lead observation methods have been developed for a long time, such as differentiators, PD controllers, phase lead compensators, and high-performance lead observers, etc. However, the lead observation effects of these methods still cannot meet the existing observation requirements, and the performance of suppressing the deviation of the reheat steam temperature in the reheat steam temperature control system of thermal power units is insufficient, thus affecting the control effect. In order to meet the requirements of various different control processes, the lead observation method needs to be developed. Summary of the Invention

[0003] The purpose of the present application is to provide a process signal accelerator, an acceleration observation method, and a reheat steam temperature control system, so as to realize the early output of the control quantity in the control process to improve the acceleration effect, and at the same time, it is beneficial to suppress the deviation of the reheat steam temperature and enhance the control effect.

[0004] To achieve the above purpose, the present application provides a process signal accelerator, including:

[0005] A positive acceleration unit, a negative acceleration unit, and an output adder;

[0006] The positive acceleration unit is used to perform positive acceleration on the input signal to generate a positive acceleration signal;

[0007] The negative acceleration unit is used to perform negative acceleration on the input signal to generate a negative acceleration signal;

[0008] The output adder is used to add the positive acceleration signal and the negative acceleration signal to generate an output signal.

[0009] Further, the positive acceleration unit includes a first positive feedback link, a first differentiator, a positive output controller, a first integrator, and a first integral limiter;

[0010] The first positive feedback link, the first differentiator, and the positive output controller are connected in sequence;

[0011] The input end of the first positive feedback link is used to receive the input signal, and the output end of the positive output controller is used to output the positive acceleration signal;

[0012] The input terminal of the first integrator is connected to the output terminal of the first positive feedback link, and the output terminal of the first integrator is connected to the feedback terminal of the first positive feedback link;

[0013] The first integral limiter is connected to the first integrator and is used to limit the signal of the first integrator.

[0014] Further, the first integrator is:

[0015]

[0016] where IA(s) is the transfer function of the first integrator, s is the Laplace operator, and T IA is the integration time constant with the unit of s;

[0017] The first integral limiter is:

[0018]

[0019] where IA(t) is the output signal of the first integrator and IN(t) is the input signal of the process signal accelerator; the first differentiator is:

[0020]

[0021] where DA(s) is the transfer function of the first differentiator, s is the Laplace operator, and T DA is the differential time constant with the unit of s; K DA is the differential gain with the unit of dimensionless;

[0022] The forward output controller is:

[0023]

[0024] where FOC(t) is the output signal of the forward output controller and DA(t) is the output signal of the first differentiator.

[0025] Further, the negative acceleration unit includes a second positive feedback link, a second differentiator, a negative output controller, a second integrator, and a second integral limiter;

[0026] The second positive feedback link, the second differentiator, and the negative output controller are connected in sequence;

[0027] The input terminal of the second positive feedback link is used to receive the input signal, and the output terminal of the negative output controller is used to output the negative acceleration signal;

[0028] The input end of the second integrator is connected to the output end of the second positive feedback link, and the output end of the second integrator is connected to the feedback end of the second positive feedback link;

[0029] The second integral limiter is connected to the second integrator and is used to limit the signal of the second integrator.

[0030] Further, the second integrator is:

[0031]

[0032] where IB(s) is the transfer function of the second integrator, s is the Laplace operator, and T IB is the integration time constant with the unit of s;

[0033] The second integral limiter is:

[0034]

[0035] where IB(t) is the output signal of the second integrator and IN(t) is the input signal of the process signal accelerator; the second differentiator is:

[0036]

[0037] where DB(s) is the transfer function of the second differentiator, s is the Laplace operator, T DB is the differentiation time constant with the unit of s, and K DB is the differentiation gain with the unit of dimensionless;

[0038] The negative output controller is:

[0039]

[0040] where NOC(t) is the output signal of the negative output controller and DB(t) is the output signal of the second differentiator.

[0041] Further, the input signal includes the deviation signal between the reheat steam temperature setting value and the reheat steam temperature of the reheat steam temperature control system of the thermal power unit.

[0042] This application also provides a method for accelerating and observing a process signal. By referring to the process signal accelerator described in any one of the above items, the method includes:

[0043] Input a unit step input signal into a fourth-order inertial process, and input the output signal of the fourth-order inertial process into the process signal accelerator to obtain an accelerated output signal; where the fourth-order inertial process is:

[0044]

[0045] Wherein, FOIP(s) is the transfer function of the fourth-order inertial process FOIP, and T FOIP is the FOIP time constant, with the unit of s.

[0046] This application also provides a reheater steam temperature control system for a thermal power unit, including a controller and a control process. The controller includes the process signal accelerator described in any one of the above.

[0047] Further, the controller further includes:

[0048] a cascade proportional controller and an engineering fastest integrator;

[0049] The cascade proportional controller is used to receive the input signal given by the process and input the generated output signal into the engineering fastest integrator and the process signal accelerator respectively;

[0050] The output signal of the engineering fastest integrator and the output signal of the process signal accelerator are summed and used as the input signal of the control process.

[0051] Further, the controller is:

[0052] C(s) = K CPC [PSA(s) + EFI(s)],

[0053]

[0054]

[0055] Wherein, C(s) is the transfer function of the controller C, PSA(s) is the transfer function of the process signal accelerator PSA, EFI(s) is the transfer function of the engineering fastest integrator EFI, s is the Laplace operator, and K CPC is the gain of the cascade proportional controller CPC, with the unit of dimensionless; in the transfer function of EFI, n is the order of EFI, with the unit of dimensionless; T EFI is the time constant of HEI, with the unit of s; T IA is the integral time constant of the first integrator, with the unit of s; T DA is the differential time constant of the first differentiator, with the unit of s; K DA is the gain of the first differentiator, with the unit of dimensionless; IA(t) is the output signal of the first integrator, and DA(t) is the output signal of the first differentiator; T IB is the integral time constant of the second integrator, with the unit of s; T DB is the differential time constant of the second differentiator, with the unit of s; K DBis the gain of the second differentiator, with the unit being dimensionless; IB(t) is the output signal of the second integrator, DB(t) is the output signal of the second differentiator, and IN(t) is the input signal of the PSA.

[0056] Compared with the prior art, the beneficial effects of the present application are as follows:

[0057] The present application discloses a process signal accelerator, an acceleration observation method, and a reheater steam temperature control system. The accelerator includes a forward acceleration unit, a negative acceleration unit, and an output adder; the forward acceleration unit is used to perform forward acceleration on the input signal to generate a forward acceleration signal; the negative acceleration unit is used to perform negative acceleration on the input signal to generate a negative acceleration signal; the output adder is used to add the forward acceleration signal and the negative acceleration signal to generate an output signal. The process signal accelerator provided by the present application realizes two-way acceleration observation of the forward acceleration unit and the negative acceleration unit through a positive feedback link, realizes the early output of the control quantity during the control process, thereby improving the acceleration effect. At the same time, applying this process signal accelerator to the construction of the reheater steam temperature control system of a thermal power unit can help suppress the deviation of the reheater steam temperature and ultimately enhance the control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the present application, the drawings required for implementation will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0059] Figure 1 is a schematic structural diagram of a process signal accelerator provided by an embodiment of the present application;

[0060] Figure 2 is a schematic structural diagram of a process signal accelerator provided by another embodiment of the present application;

[0061] Figure 3 is a schematic flow diagram of a process signal acceleration observation method using a process signal accelerator for a fourth-order inertial process provided by an embodiment of the present application;

[0062] Figure 4 is Figure 3 a schematic diagram of the experimental results of the output signal of the process signal accelerator in

[0063] Figure 5 is a schematic structural diagram of a reheater steam temperature control system of a thermal power unit provided by an embodiment of the present application;

[0064] Figure 6 is Figure 5Schematic diagram of the control result of the intermediate reheat steam temperature control system. Specific implementation manners

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0066] It should be understood that the step numbers used in the text are only for convenience of description and do not limit the order of execution of the steps.

[0067] It should be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification of the present application and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0068] The terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0069] The term "and / or" refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0070] Any process or method description shown in the flowchart or described in other ways herein can be understood to represent a module, segment or part of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a way that is not shown or discussed, including in a substantially simultaneous manner or in a reverse order according to the involved functions, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0071] The logic and / or steps represented in the flowchart or otherwise described 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 and execute instructions from the instruction execution system, apparatus or device), or used in combination with these instruction execution systems, apparatus or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in combination with an instruction execution system, apparatus or device.

[0072] Please refer to Figure 1 , an embodiment of the present application provides a Process Signal Accelerator (PSA), including:

[0073] A positive acceleration unit 1, a negative acceleration unit 2, and an output adder 3;

[0074] The positive acceleration unit 1 is used to perform positive acceleration on the input signal to generate a positive acceleration signal;

[0075] The negative acceleration unit 2 is used to perform negative acceleration on the input signal to generate a negative acceleration signal;

[0076] The output adder 3 is used to add the positive acceleration signal and the negative acceleration signal to generate an output signal.

[0077] Preferably, the input signal can be the deviation signal between the reheat steam temperature set value and the reheat steam temperature of the reheat steam temperature control system of a thermal power unit.

[0078] In a specific embodiment, the positive acceleration unit 1 includes a first positive feedback link 10, a first differentiator 11, a positive output controller 12, a first integrator 13, and a first integral limiter 14, as Figure 2 shown. Among them,

[0079] The first positive feedback link 10, the first differentiator 11, and the positive output controller 12 are connected in sequence;

[0080] The input end of the first positive feedback link 10 is used to receive the input signal, and the output end of the positive output controller 12 is used to output the positive acceleration signal;

[0081] The input end of the first integrator 13 is connected to the output end of the first positive feedback link 10, and the output end of the first integrator 13 is connected to the feedback end of the first positive feedback link 10;

[0082] The first integral limiter 14 is connected to the first integrator 13 and is used to limit the signal of the first integrator 13.

[0083] It should be noted that the reason for using the first integral limiter 14 in this embodiment is that the output of the first integrator 13 often does not converge. Therefore, it is necessary to limit the output of the first integrator 13 through the first integral limiter 14.

[0084] As Figure 2 shown, V HA is the upper limit value of the output signal of the first integrator 13, and the unit is dimensionless; V LA is the lower limit value of the output signal of the first integrator 13, and the unit is dimensionless.

[0085] Furthermore, the first integrator 13 is:

[0086]

[0087] In the formula, IA(s) is the transfer function of the first integrator 13, s is the Laplace operator, and T IA is the integration time constant, and the unit is s.

[0088] The first integral limiter 14 is:

[0089]

[0090] In the formula, IA(t) is the output signal of the first integrator 13, and IN(t) is the input signal of the process signal accelerator.

[0091] The first differentiator 11 is:

[0092]

[0093] In the formula, DA(s) is the transfer function of the first differentiator 11, s is the Laplace operator, and T DA is the differential time constant, and the unit is s; K DA is the differential gain, and the unit is dimensionless.

[0094] The forward output controller 12 is:

[0095]

[0096] In the formula, FOC(t) is the output signal of the forward output controller 12, and DA(t) is the output signal of the first differentiator 11.

[0097] Please continue to refer to Figure 2, in a specific embodiment, the negative acceleration unit 2 includes a second positive feedback link 20, a second differentiator 21, a negative output controller 22, a second integrator 23, and a second integral limiter 24; among them,

[0098] The second positive feedback link 20, the second differentiator 21, and the negative output controller 22 are connected in sequence;

[0099] The input end of the second positive feedback link 20 is used to receive an input signal, and the output end of the negative output controller 22 is used to output a negative acceleration signal;

[0100] The input end of the second integrator 23 is connected to the output end of the second positive feedback link 20, and the output end of the second integrator 23 is connected to the feedback end of the second positive feedback link 20;

[0101] The second integral limiter 24 is connected to the second integrator 23 and is used to limit the signal of the second integrator 23.

[0102] Similarly, the function of using the second integral limiter 24 in this embodiment is also to limit, that is, for the case where the output of the second integrator 23 does not converge, its output is limited.

[0103] As Figure 2 shown, V HB is the high limit value of the output signal of the second integrator 23, with the unit of dimensionless; V LB is the low limit value of the output signal of the second integrator 23, with the unit of dimensionless.

[0104] Furthermore, the second integrator 23 is:

[0105]

[0106] In the formula, IB(s) is the transfer function of the second integrator 23, s is the Laplace operator, and T IB is the integral time constant, with the unit of s.

[0107] The second integral limiter 24 is:

[0108]

[0109] In the formula, IB(t) is the output signal of the second integrator 23, and IN(t) is the input signal of the process signal accelerator.

[0110] The second differentiator 21 is:

[0111]

[0112] In the formula, DB(s) is the transfer function of the second differentiator 21, s is the Laplace operator, and T DBis the differential time constant, with the unit of s, and K DB is the differential gain, with the unit of dimensionless.

[0113] The negative output controller 22 is:

[0114]

[0115] In the formula, NOC(t) is the output signal of the negative output controller 22, and DB(t) is the output signal of the second differentiator 21.

[0116] In summary, the process signal accelerator provided by the embodiments of the present application realizes the two-way acceleration observation of the positive acceleration unit 1 and the negative acceleration unit 2 through the positive feedback link, and realizes the early output of the control quantity in the control process.

[0117] Please refer to Figure 3 , in order to help understand the acceleration effect of the process signal accelerator provided by the above embodiments, in a specific embodiment, the above process signal accelerator is also used for a fourth-order inertial process (FOIP), and the acceleration observation is carried out by inputting a unit step input signal.

[0118] Specifically, the process signal acceleration observation method of this embodiment includes the following steps:

[0119] Input the unit step input signal into the fourth-order inertial process, and input the output signal of the fourth-order inertial process into the process signal accelerator to obtain the accelerated output signal;

[0120] Among them, the fourth-order inertial process is:

[0121]

[0122] In the formula, FOIP(s) is the transfer function of the fourth-order inertial process FOIP, and T FOIP is the FOIP time constant, with the unit of s.

[0123] Further, when T IA = 100s, T DA = 100s, K DA = 4, T IB = 100s, T DB = 100s, K DB = 4, T FOIP = 100s, the FOIP input is a unit step signal, and the experimental results of the output signal of the process signal accelerator PSA are obtained, as shown in Figure 4 . At the moment of t = 0s, the input signal is a unit step signal, and at the moment of t = 1800s, the input signal changes to a unit negative step. Among them, PVFOIP (t) is the process output signal of the fourth-order inertial process FOIP under a unit step input, PV PSA (t) is the process output signal of the process signal accelerator PSA. As can be seen from Figure 4 , the output signal PV of the process signal accelerator PSA (t) is significantly ahead of the process output signal PV FOIP (t).

[0124] Please refer to Figure 5 . In another exemplary embodiment, the above process signal accelerator is also used to construct a reheater steam temperature control system for a thermal power unit.

[0125] Specifically, the reheater steam temperature control system of the thermal power unit includes a controller and a control process. The controller includes the process signal accelerator described in any of the above embodiments.

[0126] According to Figure 5 , the process given input signal first enters the controller, and then the output signal of the controller is given to the control process, and finally the output signal of the control process is obtained as the process output result. Among them, the output signal of the control process is also fed back to the process given input process.

[0127] As Figure 5 shown, in a specific embodiment, the structure of the controller mainly includes:

[0128] The process signal accelerator, the cascade proportional controller, and the engineering fastest integrator;

[0129] The cascade proportional controller is used to receive the process given input signal and input the generated output signal into the engineering fastest integrator and the process signal accelerator respectively;

[0130] The output signal of the engineering fastest integrator and the output signal of the process signal accelerator are summed as the input signal of the control process.

[0131] Therefore, based on the above controller structure, the transfer function of the controller (Controller, C) is obtained as:

[0132] C(s) = K CPC [PSA(s) + EFI(s)],

[0133]

[0134]

[0135] where C(s) is the transfer function of the controller C, PSA(s) is the transfer function of the process signal accelerator PSA, EFI(s) is the transfer function of the engineering fastest integrator EFI, s is the Laplace operator, and K CPC is the gain of the cascade proportional controller CPC, with the unit being dimensionless; in the transfer function of EFI, n is the order of EFI, with the unit being dimensionless; T EFI is the time constant of HEI, with the unit being s; T IA is the integral time constant of the first integrator, with the unit being s; T DA is the differential time constant of the first differentiator, with the unit being s; K DA is the gain of the first differentiator, with the unit being dimensionless; IA(t) is the output signal of the first integrator, and DA(t) is the output signal of the first differentiator; T IB is the integral time constant of the second integrator, with the unit being s; T DB is the differential time constant of the second differentiator, with the unit being s; K DB is the gain of the second differentiator, with the unit being dimensionless; IB(t) is the output signal of the second integrator, DB(t) is the output signal of the second differentiator, and IN(t) is the input signal of PSA.

[0136] Furthermore, applying the controller C of the reheater steam temperature control system to the reheater steam temperature control process of a 1000MW ultra-supercritical thermal power unit in a certain power plant, the control results are as Figure 6 shown.

[0137] From Figure 6 it can be seen that after adding the process signal accelerator PSA at 14:00, before adding PSA, the reheater steam temperature deviation was +6.7℃ / -5.9℃ relative to the reheater steam temperature setting; after adding PSA, the reheater steam temperature deviation was +5.2℃ / -3.2℃ relative to the reheater steam temperature setting. Thus, it can be seen that PSA has a good effect on reducing the reheater steam temperature deviation. Therefore, when using the process signal accelerator provided in this application to construct the reheater steam temperature control system of a thermal power unit, it can be beneficial to suppress the deviation of the reheater steam temperature and ultimately enhance the control effect.

[0138] In several embodiments provided by this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or page components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0139] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0140] In addition, in each embodiment of this application, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of hardware plus software functional units.

[0141] The above-mentioned integrated units implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional units stored in a storage medium include several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute some steps of the methods described in each embodiment of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of this application.

Claims

1. A process signal accelerator, characterized in that, Comprising: A positive acceleration unit, a negative acceleration unit and an output adder; The positive acceleration unit is used to positively accelerate an input signal to generate a positive acceleration signal; the positive acceleration unit includes a first positive feedback loop, a first differentiator, a positive output controller, a first integrator and a first integral limiter; The first positive feedback loop, the first differentiator and the positive output controller are connected in sequence; the input end of the first positive feedback loop is used to receive the input signal, and the output end of the positive output controller is used to output the positive acceleration signal; The negative acceleration unit is used to negatively accelerate an input signal to generate a negative acceleration signal; the negative acceleration unit includes a second positive feedback loop, a second differentiator, a negative output controller, a second integrator and a second integral limiter; the second positive feedback loop, the second differentiator and the negative output controller are connected in sequence; the input end of the second positive feedback loop is used to receive the input signal, and the output end of the negative output controller is used to output the negative acceleration signal; The output adder is used to add the positive acceleration signal and the negative acceleration signal to generate an output signal.

2. The process signal accelerator according to claim 1, characterized in that, The input end of the first integrator is connected to the output end of the first positive feedback loop, and the output end of the first integrator is connected to the feedback end of the first positive feedback loop; The first integral limiter is connected to the first integrator and is used to limit the signal of the first integrator.

3. The process signal accelerator according to claim 2, characterized in that, The first integrator is: where \(I_A(s)\) is the transfer function of the first integrator, \(s\) is the Laplace operator, and \(T\) IA is the integration time constant with the unit of s; The first integral limiter is: Where IA(t) is the output signal of the first integrator and IN(t) is the input signal of the process signal accelerator; The first differentiator is: where \(D_A(s)\) is the transfer function of the first differentiator, \(s\) is the Laplace operator, and \(T\) DA is the differentiation time constant with the unit of s; \(K\) DA is the differentiation gain with the unit of dimensionless; The positive output controller is: Where FOC(t) is the output signal of the positive output controller and DA(t) is the output signal of the first differentiator.

4. The process signal accelerator according to claim 1, characterized in that, The input end of the second integrator is connected to the output end of the second positive feedback loop, and the output end of the second integrator is connected to the feedback end of the second positive feedback loop; The second integral limiter is connected to the second integrator and is used to limit the signal of the second integrator.

5. The process signal accelerator according to claim 4, characterized in that, The second integrator is: where $I_B(s)$ is the transfer function of the second integrator, $s$ is the Laplace operator, and $T$ IB is the integration time constant with the unit of s; The second integral limiter is: Where IB(t) is the output signal of the second integrator and IN(t) is the input signal of the process signal accelerator; The second differentiator is: where $DB(s)$ is the transfer function of the second differentiator, $s$ is the Laplace operator, $T$ DB is the differentiation time constant, with the unit of s, and $K$ DB is the differentiation gain, with the unit of dimensionless; The negative output controller is: Where NOC(t) is the output signal of the negative output controller and DB(t) is the output signal of the second differentiator.

6. The process signal accelerator according to claim 1, characterized in that: The input signal includes the deviation signal between the reheat steam temperature setting of the reheating steam temperature control system of the thermal power unit and the reheating steam temperature.

7. A process signal acceleration observation method, referring to the process signal accelerator according to any one of claims 1 to 6, characterized in that: The method includes: Inputting a unit step input signal into a fourth-order inertial process, and inputting the output signal of the fourth-order inertial process into the process signal accelerator to obtain an accelerated output signal; where the fourth-order inertial process is: where FOIP(s) is the transfer function of the fourth-order inertial process FOIP, and T FOIP is the FOIP time constant, with the unit of s.

8. A reheat steam temperature control system for a thermal power unit, comprising a controller and a control process, characterized in that: The controller includes the process signal accelerator as described in any one of claims 1-6.

9. The reheat steam temperature control system of a thermal power unit according to claim 8, characterized in that: The controller further includes: A cascade proportional controller and an engineering fastest integrator; The cascade proportional controller is used to receive the input signal given by the process and input the generated output signal into the engineering fastest integrator and the process signal accelerator respectively; The output signal of the engineering fastest integrator and the output signal of the process signal accelerator are summed up as the input signal of the control process.

10. The reheat steam temperature control system of a thermal power unit according to claim 9, characterized in that: The controller is: C(s) = K CPC [PSA(s) + EFI(s)], Wherein, C(s) is the transfer function of the controller C, PSA(s) is the transfer function of the process signal accelerator PSA, EFI(s) is the transfer function of the engineering fastest integrator EFI, s is the Laplace operator, and K CPC is the gain of the cascade proportional controller CPC, with the unit of dimensionless; In the transfer function of EFI, n is the order of EFI, with the unit being dimensionless; T EFI is the time constant of HEI, with the unit being s; T IA is the integration time constant of the first integrator, with the unit being s; T DA is the differentiation time constant of the first differentiator, with the unit being s; K DA is the gain of the first differentiator, with the unit being dimensionless; IA(t) is the output signal of the first integrator, and DA(t) is the output signal of the first differentiator; T IB is the integration time constant of the second integrator, with the unit being s; T DB is the differentiation time constant of the second differentiator, with the unit being s; K DB is the gain of the second differentiator, with the unit being dimensionless; IB(t) is the output signal of the second integrator, DB(t) is the output signal of the second differentiator, and IN(t) is the input signal of the process signal accelerator.

Images