Improved control method, system, controller and readable storage medium for input inertia compensation of main steam pressure system of thermal power unit

Abstract

The present invention proposes an improved control method, system, controller and readable storage medium for input inertia compensation of the main steam pressure system of a thermal power unit. The method comprises the following steps: establishing a flow chart from coal feed quantity instruction to main steam pressure. n Design of coal feeding instruction based on state space model n ‑ i The input inertia compensation link; the input inertia compensation link output and main steam pressure are sent to i This method employs a modified cascaded extended state observer (CESO) to estimate the main steam pressure system state using an observer algorithm. A control law is designed based on the CESO output and the main steam pressure setpoint. The control variable output passes through a limiting and rate limiting module, and then a feedforward control variable is added to serve as a new coal feed rate instruction. This method significantly overcomes the high inertia of the main steam pressure system of a thermal power plant, increases the rate of change of the coal feed rate instruction, and thus improves the control quality of the main steam pressure system.

Description

Technical Field

[0001] The present invention relates to the field of optimization control of a main steam pressure system of a thermal power plant, and in particular to an input inertia compensation improvement control method and device for a main steam pressure system of a thermal power plant. Background Art

[0002] The main steam pressure system of a thermal power plant regulates main steam pressure by adjusting the coal feed rate command. However, this system is a typical high-inertia system, characterized by slow response and weak anti-interference capabilities. As thermal power plants operate over a wide range of loads, the control quality of the main steam pressure system becomes a crucial factor affecting the unit's load response rate and stable low-load operation.

[0003] At present, the control research of the main steam pressure system of thermal power units mainly includes feedforward control, weak model feedback control such as PID, strong model feedback control such as model predictive control, and feedback control based on artificial intelligence.

[0004] Feedforward control mainly accelerates the response speed of the main steam pressure system by optimizing coal quality correction and combining load feedforward. It is generally used in combination with feedback control.

[0005] PID has the advantages of simple structure, stable performance and easy engineering implementation. However, it has the disadvantages of slow response speed and weak anti-interference ability when dealing with large inertia processes.

[0006] Robust control does not rely on precise mathematical models, but the designed controllers are generally high-order controllers, which are difficult to implement in engineering and are highly conservative.

[0007] Model predictive control has satisfactory control effects when the model is accurately known. However, the control performance decreases significantly when the model deviates from the design conditions.

[0008] Feedback control based on artificial intelligence has limited practical application value due to difficulties such as computational complexity, difficulty in ensuring convergence, and difficulty in engineering implementation.

[0009] Active disturbance rejection control (ADRC) has garnered widespread attention due to its strong interference immunity and independence from precise mathematical models. To address the challenges of ADRC in dealing with high-inertia processes, Chinese invention patents CN201810041569.0 and CN202011125339.6 respectively designed improved input and output compensation schemes. However, neither scheme addressed the extended state observer (ESO). Consequently, when the observer compensation order is low, issues such as excessively high ESO order and limited bandwidth arise, further compromising the tracking and interference rejection capabilities of the main steam pressure system of thermal power units. Summary of the Invention

[0010] The purpose of the present invention is to improve the tracking ability and anti-interference ability of the main steam pressure system of a thermal power plant, and to provide an input inertia compensation improved control method and device for the main steam pressure system of a thermal power plant.

[0011] In a first aspect, the present invention provides an improved control method for input inertia compensation of a main steam pressure system of a thermal power unit, comprising the following steps:

[0012] 1) Based on the data of coal feed rate command changes and main steam pressure changes of thermal power units, an n-order state space model from coal feed rate command u to main steam pressure y is established through identification method;

[0013] 2) Design the ni-order input inertia compensation link of the coal feed rate command u based on the n-order state space model, and i∈[1,n];

[0014] 3) Input the output of the inertia compensation link and main steam pressure y are fed into the j-order improved cascade expanded state observer;

[0015] 4) Based on the output z of the improved cascade extended state observer j+1 and the design control law for the main steam pressure setpoint r;

[0016] 5) The output u1 of the control law is used to obtain the new coal feeding instruction u through the limit and speed limit modules. new ;

[0017] 6) Update the coal feeding quantity instruction u to the coal feeding quantity instruction u new and feedforward control quantity u ff The sum of u = u new +u ff The main steam pressure system adjusts the coal feed quantity instruction according to the updated u and regulates the main steam pressure system.

[0018] Based on the above, the n-order state space model is:

[0019]

[0020] Where, is the state variable of the main steam pressure system,

[0021] is the state matrix of the main steam pressure system,

[0022] is the input matrix of the main steam pressure system, is the output matrix of the main steam pressure system, u is the coal feeding instruction, y is the main steam pressure; n is the state space model order, n∈(1,10 10] and is an integer; T is the parameter of the state space model, and T∈(0,10 10 ]; b is the gain of the state space model, b∈[-10 10 ,0).

[0023] Based on the above, the expression of the designed input inertia compensation link is:

[0024]

[0025] Where, is the state variable of the input inertia compensation link;

[0026] is the state matrix of the input inertia compensation link;

[0027] is the input matrix of the inertia compensation link, u ff is the feedforward control quantity.

[0028] Based on the above, the improved cascade extended state observer is designed as follows:

[0029] If j = 1, the improved cascade extended state observer is:

[0030]

[0031] If j ≥ 2, the improved cascade extended state observer is:

[0032]

[0033] Where ξ1, ξ i and ξ j are intermediate variables, z1, z i and z j To improve the output of the cascade expansion state observer, it is also an estimate of the main steam pressure system state; l1, l i and l j is the gain of the improved cascade extended state observer, is the parameter that needs to be tuned; b0 is the estimated value of the gain b of the state space model, is the parameter that needs to be tuned.

[0034] Based on the above, the expression of the designed control law is as follows:

[0035]

[0036] Where k2, k i and k j is the gain of the control law, is the parameter that needs to be adjusted; u1 is the output of the control law.

[0037] Based on the above, the output u1 of the control law is used to obtain the new coal feeding instruction u through the limiting and speed limiting modules. new The method is:

[0038]

[0039] and

[0040]

[0041] Where u new1 is the output of the limiting module, u 1max The upper limit of the output allowed by the limiter module, u 1min The lower limit of the output allowed by the limiter module; for u new1 The value at the last sampling moment, Δt is the sampling period, R Rising is the maximum rate value of the positive rate change, R Decent The maximum rate value for negative rate change.

[0042] In a second aspect, the present invention provides an improved control system for input inertia compensation of a main steam pressure system of a thermal power unit, comprising:

[0043] A state space model module is provided with a preset n-order state space model; the n-order state space model is a state space model from the coal feed rate instruction u to the main steam pressure y established by an identification method based on the data of the coal feed rate instruction change and the main steam pressure change of the thermal power unit;

[0044] Input inertia compensation link module, the input end of which is connected to the coal feeding amount instruction u; the input inertia compensation link is an ni-order input inertia compensation link based on the n-order state space model of the coal feeding amount instruction u, and i∈[1,n];

[0045] The input of the extended state observer module is connected to the output of the input inertia compensation module. and main steam pressure y; the expanded state observer is based on the output of the input inertia compensation module and the j-order improved cascade expanded state observer designed based on the main steam pressure y;

[0046] Control law module, the input end is connected to the output z of the extended state observer module j+1 and the main steam pressure set value r; the control law is based on the output z of the extended state observer module j+1 And the main steam pressure set value r is designed;

[0047] The amplitude limiting and speed limiting module has its input connected to the output u1 of the control law module; it is used to obtain a new coal feeding instruction u1 by amplitude limiting and speed limiting the output u1 of the control law module. new ;

[0048] Control module, connect coal feeding instruction u, new coal feeding instruction u new and feedforward control quantity u ff ; The control method is to update the coal feeding quantity instruction u to the coal feeding quantity instruction u new and feedforward control quantity u ff The sum of u = u new +u ff , and adjust the coal feed quantity instruction according to the updated u to regulate the main steam pressure system.

[0049] In a third aspect, the present invention provides a controller for a main steam pressure system of a thermal power unit, comprising:

[0050] one or more processors;

[0051] a memory for storing one or more programs,

[0052] When the one or more programs are executed by the one or more processors, the one or more processors are caused to execute the steps of the input inertia compensation improved control method for the main steam pressure system of the thermal power plant.

[0053] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the input inertia compensation improved control method of the main steam pressure system of a thermal power unit.

[0054] The present invention has outstanding substantive features and significant improvements over the prior art. Specifically:

[0055] 1. To address the control difficulties of the main steam pressure system of a thermal power unit, the present invention designs an input inertia compensation link based on the state-space model of the main steam pressure system and an improved extended state observer. This allows the extended state observer to be converted into a cascade of lower-order extended state observers, effectively avoiding the problems of excessively high order and limited bandwidth of the extended state observer caused by a lower compensation order.

[0056] 2. The present invention designs an input inertia compensation link so that the control method of the denitrification system has the advantages of resisting amplitude and rate saturation.

[0057] 3. The improvement of the input inertia compensation link proposed in the present invention can achieve a satisfactory control effect when b0 deviates greatly from the gain b of the state space model. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 Schematic diagram of the implementation steps of the method of the present invention.

[0059] Figure 2 This is a control principle block diagram of the method of the present invention.

[0060] Figure 3 This is the control effect of the method of the present invention and other comparative methods under nominal working conditions.

[0061] Figure 4 This is the Monte Carlo experiment result of the method of the present invention. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0063] Example 1

[0064] This embodiment proposes an improved control method for input inertia compensation of the main steam pressure system of a thermal power unit. The process is as follows: Figure 1 As shown, the control principle is as follows Figure 2 As shown, the following steps are included:

[0065] 101) Based on the data of coal feed rate command change and main steam pressure change of thermal power units, an n-order state space model from coal feed rate command u to main steam pressure y is established through identification method;

[0066] The n-order state space model is:

[0067]

[0068] Where, is the state variable of the main steam pressure system,

[0069] is the state matrix of the main steam pressure system,

[0070] is the input matrix of the main steam pressure system, is the output matrix of the main steam pressure system, u is the coal feed instruction, y is the main steam pressure; n is the state space model order, n∈1,10 10 ] and is an integer; T is the parameter of the state space model, and T∈(0,10 10 ]; b is the gain of the state space model, b∈[-10 10 ,0).

[0071] In this embodiment, n=5, T=125, and b=5.88 / 125.

[0072] 102) Design the ni-order input inertia compensation link of the coal feed rate command u based on the n-order state space model, and i∈[1,n];

[0073] The expression of the designed input inertia compensation link is:

[0074]

[0075] Where, is the state variable of the input inertia compensation link;

[0076] is the state matrix of the input inertia compensation link;

[0077] is the input matrix of the inertia compensation link, u ff is the feedforward control quantity.

[0078] In this embodiment, u ff =0 and i=2.

[0079] 103) The output of the input inertia compensation link obtained in step 102) is and main steam pressure y are fed into the j-order improved cascade expanded state observer;

[0080] The improved cascade extended state observer is designed as follows:

[0081] If j = 1, the improved cascade extended state observer is:

[0082]

[0083] If j ≥ 2, the improved cascade extended state observer is:

[0084]

[0085] Where ξ1, ξ i and ξ j are intermediate variables, z1, z i and z j To improve the output of the cascade expansion state observer, it is also an estimate of the main steam pressure system state; l1, l i and l j is the gain of the improved cascade extended state observer, is the parameter that needs to be tuned; b0 is the estimated value of the gain b of the state space model, is the parameter that needs to be tuned.

[0086] In this embodiment, j=2, b0=0.1, l1=0.2, l2=0.01.

[0087] It should be noted that the parameters requiring tuning (hereinafter referred to as such) are designed parameters. The specific values ​​to be used can be determined through various tuning methods, which can be based on existing methods and are not specifically discussed in this disclosure. The parameters requiring tuning are given values ​​and are directly determined during the specific implementation of the present disclosure.

[0088] 104) Based on the output z of the improved cascade extended state observer obtained in step 103) j+1 and the design control law for the main steam pressure setpoint r;

[0089] The expression of the designed control law is as follows:

[0090]

[0091] Where k2, k i and k j is the gain of the control law, is the parameter that needs to be adjusted; u1 is the output of the control law.

[0092] In this embodiment, k1=0.0121 and k2=0.22.

[0093] 105) The control law output u1 obtained in step 104) is used to obtain a new coal feeding instruction u through the limit and speed limit modules. new ;

[0094] Get the new coal feeding instruction u new The method is:

[0095]

[0096] and

[0097]

[0098] Where u new1 is the output of the limiting module, u 1max The upper limit of the output allowed by the limiter module, u 1min The lower limit of the output allowed by the limiter module; for u new1 The value at the last sampling moment, Δt is the sampling period, R Rising is the maximum rate value of the positive rate change, R Decent The maximum rate value for negative rate change.

[0099] In this embodiment, u 1max =1,u 1min =-1, R Rising =5, R Descent =5 and Dt=0.1.

[0100] 106) Update the coal feeding amount instruction u to the coal feeding amount instruction u obtained in step 105) new and feedforward control quantity u ff The sum of:

[0101] u=u new +u ff (8)

[0102] The main steam pressure system adjusts the coal feed rate instruction according to the updated u obtained by formula (8) to regulate the main steam pressure system.

[0103] Comparative experiment

[0104] In order to analyze the effectiveness of the method of the present invention, the method proposed in patent CN201810041569.0 (comparison method 2) and the improved method using the reduced-order extended state observer (comparison method 1) are added as comparisons. The parameters of comparison method 1 are w c =0.085, w o =0.2, b0=0.1 and G cp (s) = 1 / (125s + 1) 3 ; The parameter of comparison method 2 is w c =0.1, w o =0.2, b0=0.1 and G cp (s) = 1 / (125s + 1) 3 ; The comparison effect under nominal working conditions is as follows Figure 3 As shown in the figure, the specific simulation process is as follows: at the beginning of the simulation, the system is in a steady state, at 10s the set value is changed from 0 to 1, at 3000s the control quantity of the closed loop is disturbed from 0 to 0.3, and the simulation ends at 6000s;

[0105] The thick solid line represents the method of the present invention, the dotted line represents comparative method 1, and the dashed-dotted line represents comparative method 2. As can be seen from the figure, the method of the present invention has a faster tracking speed and stronger anti-interference ability, showing the best control quality.

[0106] In order to further verify the control effect of the method of the present invention, comparative method 1 and comparative method 2 when the system has uncertainty, a Monte Carlo experiment is used to verify that the controller parameters are kept unchanged and the gains b and T of the main steam pressure system are randomly perturbed within the range of ±20% of their initial values. Figure 3 Simulate and calculate the IAE tracking index (IAE) from 0s to 3000s in each simulation sp ) and IAE anti-interference index (IAE) from 3000s to 6000s rd ), we can get Figure 4The Monte Carlo experiment results shown in FIG. 4 show that the IAE of the method of the present invention is sp and IAE rd The value of is smaller and the distribution is more concentrated, which makes it more robust.

[0107] Example 2

[0108] Based on the same inventive concept, embodiments of the present application also provide an improved control system for input inertia compensation of a main steam pressure system of a thermal power plant. The implementation solution provided by this improved control system for input inertia compensation of a main steam pressure system of a thermal power plant is similar to the implementation solution described in the method of Example 1. Therefore, the specific limitations of one or more embodiments of the improved control system for input inertia compensation of a main steam pressure system of a thermal power plant provided below can be referred to the limitations of the method in Example 1 and will not be repeated here.

[0109] In an exemplary embodiment, an improved control system for input inertia compensation of a main steam pressure system of a thermal power plant is provided, comprising:

[0110] A state space model module is provided with a preset n-order state space model; the n-order state space model is a state space model from the coal feed rate instruction u to the main steam pressure y established by an identification method based on the data of the coal feed rate instruction change and the main steam pressure change of the thermal power unit;

[0111] Input inertia compensation link module, the input end of which is connected to the coal feeding amount instruction u; the input inertia compensation link is an ni-order input inertia compensation link based on the n-order state space model of the coal feeding amount instruction u, and i∈[1,n];

[0112] The input of the extended state observer module is connected to the output of the input inertia compensation module. and main steam pressure y; the expanded state observer is based on the output of the input inertia compensation module and the j-order improved cascade expanded state observer designed based on the main steam pressure y;

[0113] Control law module, the input end is connected to the output z of the extended state observer module j+1 and the main steam pressure set value r; the control law is based on the output z of the extended state observer module j+1 And the main steam pressure set value r is designed;

[0114] The amplitude limiting and speed limiting module has its input connected to the output u1 of the control law module; it is used to obtain a new coal feeding instruction u1 by amplitude limiting and speed limiting the output u1 of the control law module. new ;

[0115] Control module, connect coal feeding instruction u, new coal feeding instruction u newand feedforward control quantity u ff ; The control method is to update the coal feeding quantity instruction u to the coal feeding quantity instruction u new and feedforward control quantity u ff The sum of u = u new +u ff , and adjust the coal feed quantity instruction according to the updated u to regulate the main steam pressure system.

[0116] Example 3

[0117] Each module in the above system can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0118] In an exemplary embodiment, a controller for a main steam pressure system of a thermal power plant is provided. The computer device may be a terminal. The computer device further includes a processor, memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program stored in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via wired or wireless communication, where the wireless communication may be achieved via Wi-Fi, a mobile cellular network, NFC (near field communication), or other technologies. When executed by the processor, the computer program implements the steps of an improved control method for input inertia compensation of the main steam pressure system of a thermal power plant. The display unit of the computer device is used to produce a visual image and may be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device casing, or an external keyboard, touchpad or mouse.

[0119] Those skilled in the art will understand that the structure of the above-mentioned computer device is only a partial structure related to the solution of the present application and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components, or combine certain components, or have a different component arrangement.

[0120] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the computer program implements the steps of an input inertia compensation improved control method for a main steam pressure system of a thermal power plant.

[0121] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, etc., but are not limited to these.

[0122] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0123] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An improved control method for input inertia compensation of the main steam pressure system of a thermal power unit, characterized in that: The following steps are involved: 1) Based on the data of coal feed rate command changes and main steam pressure changes of thermal power units, an n-order state space model from coal feed rate command u to main steam pressure y is established through identification method; 2) Design the ni-order input inertia compensation link of the coal feed rate command u based on the n-order state space model, and i∈[1,n]; 3) Input the output of the inertia compensation link and main steam pressure y are fed into the j-order improved cascade expanded state observer; The improved cascade extended state observer is designed as follows: If j=1, the improved cascade extended state observer is: （3） If j ≥ 2, the improved cascade extended state observer is: （4） Where ξ1, ξ i and ξ j are intermediate variables, z1, z i and z j To improve the output of the cascade expansion state observer, which is also an estimate of the main steam pressure system state; l 1. l i and l j is the gain of the improved cascade extended state observer, which is the parameter that needs to be tuned; b0 is the estimated value of the gain b of the state space model, which is the parameter that needs to be tuned; 4) Based on the output z of the improved cascade extended state observer j+1 and the design control law for the main steam pressure setpoint r; 5) The output u1 of the control law is used to obtain the new coal feeding instruction u through the limiting and speed limiting modules. new ; 6) Update the coal feeding quantity instruction u to the coal feeding quantity instruction u new and feedforward control quantity u ff The sum of u=u new +u ff , the main steam pressure system adjusts the coal feeding instruction according to the updated u, and regulates the main steam pressure system; The output u1 of the control law is used to obtain the new coal feeding instruction u through the limit and speed limit modules. new The method is: （6） and （7） Where u new1 is the output of the limiting module, u 1max The upper limit of the output allowed by the limiter module, u 1min The lower limit of the output allowed by the limiter module; for u new1 The value at the last sampling moment, Δt is the sampling period, R Rising is the maximum rate value of the positive rate change, R Decent The maximum rate value for negative rate change.

2. The input inertia compensation improved control method for the main steam pressure system of a thermal power plant according to claim 1, characterized in that: The n-order state space model is: （1） Where, is the state variable of the main steam pressure system, is the state matrix of the main steam pressure system, is the input matrix of the main steam pressure system, is the output matrix of the main steam pressure system, u is the coal feeding instruction, y is the main steam pressure; n is the state space model order, n∈(1,10 10 ] and is an integer; T is the parameter of the state space model, and T∈(1,10 10 ]; b is the gain of the state space model, b∈[-10 10 ,0).

3. The input inertia compensation improved control method for the main steam pressure system of a thermal power plant according to claim 2, characterized in that: The expression of the designed input inertia compensation link is: （2） Where, is the state variable of the input inertia compensation link; is the state matrix of the input inertia compensation link; is the input matrix of the inertia compensation link, u ff is the feedforward control quantity.

4. The input inertia compensation improved control method for the main steam pressure system of a thermal power plant according to claim 3, characterized in that: The designed control law is expressed as follows: （5） Where k2, k i and k j is the gain of the control law, is the parameter that needs to be adjusted; u1 is the output of the control law.

5. An improved control system for input inertia compensation of the main steam pressure system of a thermal power unit, characterized in that: include: State space model module, preset n-order state space model; The n-order state space model is a state space model from coal feed rate instruction u to main steam pressure y established by an identification method based on data of coal feed rate instruction change and main steam pressure change of the thermal power unit; Input inertia compensation link module, the input end of which is connected to the coal feeding amount instruction u; the input inertia compensation link is an ni-order input inertia compensation link based on the n-order state space model of the coal feeding amount instruction u, and i∈[1,n]; The input of the extended state observer module is connected to the output of the input inertia compensation module. and main steam pressure y; The extended state observer is based on the output of the input inertia compensation module and the j-order improved cascade expanded state observer designed based on the main steam pressure y; Control law module, the input end is connected to the output z of the extended state observer module j+1 and the main steam pressure set value r; the control law is based on the output z of the extended state observer module j+1 And the main steam pressure set value r is designed; The amplitude limiting and speed limiting module has its input connected to the output u1 of the control law module; it is used to obtain a new coal feeding instruction u1 by amplitude limiting and speed limiting the output u1 of the control law module. new ; Control module, connect coal feeding instruction u, new coal feeding instruction u new and feedforward control quantity u ff ; The control method is to update the coal feeding quantity instruction u to the coal feeding quantity instruction u new and feedforward control quantity u ff The sum of u=u new +u ff , and adjust the coal feed quantity instruction according to the updated u to regulate the main steam pressure system.

6. A controller for the main steam pressure system of a thermal power unit, characterized in that: include: one or more processors; a memory for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors execute the steps of the input inertia compensation improved control method for the main steam pressure system of a thermal power plant according to any one of claims 1 to 4.

7. A computer-readable storage medium storing a computer program, characterized in that: When the program is executed by a processor, the steps of the input inertia compensation improvement control method of the main steam pressure system of a thermal power unit as described in any one of claims 1 to 4 are implemented.

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