Primary frequency modulation control method and system for high-pressure heater steam extraction throttling auxiliary coal-fired unit

Abstract

The invention discloses a primary frequency modulation control method and system for a high-pressure heater steam extraction throttling auxiliary coal-fired unit. The method comprises the steps that a target power grid frequency deviation signal and a target coal-fired unit load instruction are obtained, and first preprocessing is conducted on the target power grid frequency deviation signal and the target coal-fired unit load instruction; according to the result of the first preprocessing, a high-pressure steam extraction pipeline valve control signal is obtained in combination with a second preset function; according to the result of the first preprocessing, a main steam valve control instruction signal is obtained in combination with first preset control logic and a PID controller; and according to the high-pressure steam extraction pipeline valve control signal and the main steam valve control instruction signal, primary frequency modulation control over the target coal-fired unit is completed. The frequency modulation performance of the coal-fired unit is improved, the maintenance cost of the unit is reduced, and a powerful guarantee is provided for stable operation of a power grid.

Description

Technical Field

[0001] The invention relates to the technical field of thermal control of thermal power plants, and in particular to a primary frequency modulation control method and system for a high-pressure steam extraction throttling auxiliary coal-fired unit. Background Art

[0002] To achieve sustainable development, my country is vigorously building a new power system, and the proportion of intermittent renewable energy such as solar energy and wind energy in the power system has increased significantly. Coal-fired units, as relatively economical and reliable controllable power sources, have undertaken most of the peak load and frequency regulation tasks to maintain the stable and safe operation of the power grid, and are transforming from the main power source to the regulating support power source.

[0003] From the perspective of the coal-fired unit itself, any method that can quickly release the unit's heat storage and convert it into output can be used as a means of primary frequency regulation. Main steam valve regulation is a traditional method of regulating load and frequency. Its opening change has a great impact on the unit's operating parameters. In addition, the heat storage of a direct current boiler is limited, which makes its frequency regulation capability very limited. It is necessary to introduce new frequency regulation methods to alleviate the frequency regulation pressure of thermal power units. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a primary frequency regulation control method and system for a high-pressure steam extraction throttling auxiliary coal-fired unit, which can solve the problems mentioned in the background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions, a primary frequency regulation control method of a high-pressure steam extraction throttling auxiliary coal-fired unit, comprising:

[0008] Obtaining a target power grid frequency deviation signal and a target coal-fired unit load instruction, and performing a first preprocessing on the target power grid frequency deviation signal and the target coal-fired unit load instruction, wherein the result of the first preprocessing includes at least a primary frequency modulation load instruction signal and a primary frequency modulation load instruction low-frequency component signal;

[0009] According to the result of the first preprocessing and in combination with the second preset function, a high-pressure steam extraction pipeline valve control signal is obtained;

[0010] According to the result of the first preprocessing, in combination with the first preset control logic and the PID controller, a main steam valve control command signal is obtained;

[0011] According to the high-pressure steam extraction pipeline valve control signal and the main steam valve control command signal, the primary frequency modulation control of the target coal-fired unit is completed.

[0012] As a preferred solution of the primary frequency regulation control method of the high-pressure steam extraction throttling auxiliary coal-fired unit described in the present invention, wherein: the first preprocessing includes performing digital-to-analog conversion on the target power grid frequency deviation signal, and converting the target power grid frequency deviation signal after the digital-to-analog conversion into a primary frequency regulation load instruction signal;

[0013] The first preprocessing also includes calculating the action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction in combination with the first preset function, adjusting the first-order filter parameters according to the time constant value, and obtaining a low-frequency component signal of the primary frequency modulation load instruction based on the adjusted first-order filter.

[0014] As a preferred solution of the primary frequency modulation control method of the high-pressure steam extraction throttling auxiliary coal-fired unit of the present invention, the first pretreatment further includes:

[0015] The action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction is calculated in combination with the first preset function, and the first preset function is expressed as:

[0016] F 1 (P) = a 1 ·P 2 +b 1 ·P+c 1

[0017] Among them, F 1 represents the first preset function, P is the target coal-fired unit load, in MW, a 1 、b 1 、c 1 is the identification parameter of the target coal-fired unit, a 1 >0;

[0018] The action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction is expressed as:

[0019] T=F 1 (P)

[0020] Wherein, T represents the action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction.

[0021] As a preferred solution of the primary frequency modulation control method of the high-pressure steam extraction throttling auxiliary coal-fired unit described in the present invention, wherein: the step of obtaining the high-pressure steam extraction pipeline valve control signal according to the result of the first preprocessing and in combination with the second preset function comprises:

[0022] Obtaining the difference between the primary frequency modulation load instruction signal and the primary frequency modulation load instruction low-frequency component signal in the result of the first preprocessing, and recording the difference result as the primary frequency modulation load instruction high-frequency component signal;

[0023] Performing maximum value limiting processing on the high frequency component signal of the primary frequency modulation load instruction to obtain the primary frequency modulation load instruction of the high pressure steam extraction valve after the maximum value limiting processing;

[0024] According to the primary frequency modulation load instruction of the high-pressure steam extraction valve, in combination with the second preset function, a high-pressure steam extraction pipeline valve control signal is obtained;

[0025] The second preset function is expressed as:

[0026] F 2 (x) = a 2 ·x 2 +b 2 ·x+c 2

[0027] Among them, F 2 represents the second preset function, x represents the primary frequency modulation load instruction of the high-pressure steam extraction valve, the unit is MW, a 2 、b 2 、c 2 represents the opening of the high-pressure steam extraction throttle valve and the load identification parameter, a 2 <0;

[0028] The high-pressure steam extraction pipeline valve control signal is expressed as:

[0029] μ G =F 2 (x)

[0030] Among them, μ G Indicates the high-pressure steam extraction pipeline valve control signal.

[0031] As a preferred solution of the primary frequency modulation control method of the high-pressure steam extraction throttling auxiliary coal-fired unit described in the present invention, the first preset control logic includes:

[0032] Obtaining the difference between the primary frequency modulation load instruction signal and the primary frequency modulation load instruction low-frequency component signal in the result of the first preprocessing, that is, the primary frequency modulation load instruction high-frequency component signal;

[0033] Performing maximum value limiting processing on the high frequency component signal of the primary frequency modulation load instruction to obtain the primary frequency modulation load instruction of the high pressure steam extraction valve after the maximum value limiting processing;

[0034] Obtaining a difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve, and recording the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve as a main steam valve high frequency component compensation value;

[0035] If the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve is a non-positive number, the high frequency component compensation value of the main steam valve is zero, that is, the main steam valve does not need to perform compensation operation;

[0036] If the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve is a positive number, the high frequency component compensation value of the main steam valve is positive.

[0037] As a preferred solution of the primary frequency modulation control method of the high-pressure steam extraction throttling auxiliary coal-fired unit described in the present invention, the first preset control logic also includes:

[0038] Obtaining the sum of the low-frequency component signal of the primary frequency modulation load instruction in the result of the first preprocessing and the high-frequency component compensation value of the main steam valve, and recording the sum of the low-frequency component signal of the primary frequency modulation load instruction in the result of the first preprocessing and the high-frequency component compensation value of the main steam valve as the primary frequency modulation load instruction of the main steam valve;

[0039] The difference between the target coal-fired unit primary frequency regulation real-time output power and the high-pressure steam extraction valve primary frequency regulation load instruction is obtained and recorded as the main steam valve primary frequency regulation real-time output power.

[0040] As a preferred solution of the primary frequency modulation control method of the high-pressure steam extraction throttling auxiliary coal-fired unit of the present invention, wherein: the obtaining of the main steam valve control command signal according to the result of the first preprocessing, in combination with the first preset control logic and the PID controller, comprises:

[0041] The main steam valve primary frequency modulation load instruction is input into the set value interface of the PID controller, the main steam valve primary frequency modulation real-time output power is input into the current value interface of the PID controller, and the main steam valve control instruction signal is obtained according to the preset PID controller.

[0042] The primary frequency regulation control system of the high-pressure steam extraction throttling auxiliary coal-fired unit includes:

[0043] A first preprocessing module, used for obtaining a target grid frequency deviation signal and a target coal-fired unit load instruction, and performing a first preprocessing on the target grid frequency deviation signal and the target coal-fired unit load instruction, wherein the result of the first preprocessing includes at least a primary frequency modulation load instruction signal and a primary frequency modulation load instruction low-frequency component signal;

[0044] A first control signal acquisition module, used to acquire a high-pressure steam extraction pipeline valve control signal according to the result of the first preprocessing and in combination with a second preset function;

[0045] A second control signal acquisition module, used to acquire a main steam valve control command signal according to the result of the first preprocessing, in combination with a first preset control logic and a PID controller;

[0046] The frequency modulation control module is used to complete the primary frequency modulation control of the target coal-fired unit according to the high-pressure steam extraction pipeline valve control signal and the main steam valve control command signal.

[0047] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0048] A computer-readable storage medium stores a computer program, which implements the steps of the method described above when executed by a processor.

[0049] Beneficial effects of the present invention: The present invention proposes a method and system for primary frequency regulation control of a coal-fired unit assisted by high-pressure steam extraction throttling, obtains a target power grid frequency deviation signal and a target coal-fired unit load instruction, and performs a first preprocessing on the target power grid frequency deviation signal and the target coal-fired unit load instruction, the result of the first preprocessing at least includes a primary frequency regulation load instruction signal and a primary frequency regulation load instruction low-frequency component signal; according to the result of the first preprocessing, in combination with the second preset function, obtain a high-pressure steam extraction pipeline valve control signal; according to the result of the first preprocessing, in combination with the first preset control logic and the PID controller, obtain a main steam valve control instruction signal; according to the high-pressure steam extraction pipeline valve control signal and the main steam valve control instruction signal, complete the primary frequency regulation control of the target coal-fired unit. The high-pressure heater extraction throttling of the method of the present invention can adjust the extraction flow rate entering the high-pressure heater from the high-pressure cylinder by changing the opening of the high-pressure steam extraction valve, directly change the unit load, and respond faster to frequency changes, which can effectively improve the unit frequency regulation performance. The high-pressure heater extraction throttling gives priority to responding to the high-frequency components in the unit's primary frequency regulation instructions, which can effectively reduce the number of times the unit's main steam valve operates and reduce the wear of the unit's main steam valve. The contribution of the high-pressure heater extraction throttling to respond to the primary frequency regulation load is mainly in the early stage of frequency change. The more power contributed in the early stage, the smoother the amplitude of the main steam valve of the thermal power unit, which can effectively suppress the repeated fluctuations in the unit's output power. The high-pressure heater extraction throttling is a primary frequency regulation method that starts from the coal-fired unit itself and quickly releases the unit's stored heat and converts it into output. It is simple to construct, highly automated, compatible with existing system hardware, does not require additional equipment, has a short recovery cycle, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0051] Figure 1 A method flow chart of a primary frequency regulation control method and system for a high-pressure steam extraction throttling auxiliary coal-fired unit provided in one embodiment of the present invention;

[0052] Figure 2 A schematic diagram of the thermal system structure of a coal-fired unit, which is a method and system for controlling primary frequency regulation of a coal-fired unit assisted by extraction throttling of a high-pressure heater according to an embodiment of the present invention;

[0053] Figure 3 A control logic diagram of a primary frequency regulation control method and system for a high-pressure steam extraction throttling auxiliary coal-fired unit provided in one embodiment of the present invention;

[0054] Figure 4 A graph showing the change in primary frequency modulation output power of a coal-fired unit and the action curve of a main steam valve when a high-pressure heater extraction throttling action is applied, in a method and system for controlling primary frequency modulation of a coal-fired unit assisted by extraction throttling of a high-pressure heater provided in one embodiment of the present invention;

[0055] Figure 5 An internal structural diagram of a computer device for a primary frequency modulation control method and system for a high-pressure steam extraction throttling auxiliary coal-fired unit provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0057] Example 1

[0058] Reference Figure 1-5 , is the first embodiment of the present invention, which provides a primary frequency regulation control method and system for a high-pressure steam extraction throttling auxiliary coal-fired unit, including a primary frequency regulation control method for a high-pressure steam extraction throttling auxiliary coal-fired unit and a primary frequency regulation control system for a high-pressure steam extraction throttling auxiliary coal-fired unit, wherein the primary frequency regulation control method for a high-pressure steam extraction throttling auxiliary coal-fired unit includes:

[0059] Before describing the embodiments of the present application in detail, some related concepts are first explained for the sake of clarity.

[0060] High-pressure steam extraction and throttling to assist coal-fired units: High-pressure steam extraction and throttling to assist coal-fired units refers to a technology in coal-fired power plants that uses steam extracted from high-pressure heaters (HPHs) to adjust the flow rate to assist the operation of coal-fired generators. Coal-fired units usually include boilers that burn coal to generate steam and steam turbine generators that use steam to do work. The high-pressure heater uses steam extracted from different pressure levels of the steam turbine to heat the feed water, increase its temperature, and thus improve the efficiency of the entire thermal cycle. "Extraction throttling" refers to regulating the flow of steam extracted from the steam turbine and supplied to the high-pressure heater through valves, which not only controls the pressure and temperature of the steam, but also helps adjust the turbine load to ensure the stability and economy of the system.

[0061] PID controller: The PID controller (Proportional-Integral-Derivative Controller) is a widely used closed-loop control strategy used to automatically adjust various industrial processes to ensure that the controlled variable (such as temperature, pressure, speed, etc.) closely tracks the set value. The PID controller works through three basic operations: Proportional (P): adjusts the output according to the current error size. The larger the error, the stronger the corrective action. Integral (I): Considers the effect of error accumulation over time to eliminate static errors. Even if there is a small but persistent error, the controller will gradually increase the output to correct it. Derivative (D): Predicts the trend of error change. If the error changes quickly, the controller will make larger adjustments in advance, which helps to reduce overshoot and oscillation.

[0062] Digital-to-analog conversion: Digital-to-analog conversion refers to the process of converting digital signals into analog signals. In modern control systems, since calculations and logic processing are usually completed in digital form, and the actual control objects (such as motors and valves) may require analog signals to drive, DAC has become a key component connecting these two parts. DAC converts digital data (usually binary sequences) into continuous voltage or current signals, and its accuracy and resolution determine the delicacy and quality of the analog signal.

[0063] First-order filter: The first-order filter is one of the simplest types of linear filters and is mainly used in signal processing, especially for low-pass filtering of signals, that is, allowing low-frequency signals to pass through while attenuating high-frequency signals. First-order filters can be in the form of electronic circuits, such as RC filters (composed of a resistor and a capacitor), or in the form of digital algorithms, used to remove noise from data or perform smoothing. Its transfer function has a pole, resulting in an exponential decay characteristic in its frequency response, which is suitable for simple signal smoothing and trend extraction. In control systems, first-order filters can be used to preprocess sensor inputs, remove high-frequency interference, and make the system more stable and reliable.

[0064] In the existing related technologies, the primary frequency regulation of coal-fired units is usually achieved by controlling the main steam valve. However, this traditional frequency regulation method has certain limitations in terms of response speed and regulation accuracy. In order to overcome these problems, the present invention proposes a primary frequency regulation control method for coal-fired units assisted by high-pressure steam extraction throttling.

[0065] The present application provides a method that can effectively solve the problems existing in the prior art. Next, multiple embodiments will be combined to explain in detail how to achieve the primary frequency regulation control of the high-pressure steam extraction throttling auxiliary coal-fired unit;

[0066] Figure 1 A method flow chart of a primary frequency regulation control method and system for a high-pressure steam extraction throttling auxiliary coal-fired unit is shown, including:

[0067] S101, obtaining a target power grid frequency deviation signal and a target coal-fired unit load instruction, and performing a first preprocessing on the target power grid frequency deviation signal and the target coal-fired unit load instruction, wherein the result of the first preprocessing includes at least a primary frequency modulation load instruction signal and a primary frequency modulation load instruction low-frequency component signal;

[0068] The first preprocessing includes performing digital-to-analog conversion on the target power grid frequency deviation signal, and converting the target power grid frequency deviation signal after the digital-to-analog conversion into a primary frequency regulation load instruction signal;

[0069] Furthermore, the first preprocessing also includes calculating the action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction in combination with the first preset function, adjusting the first-order filter parameters according to the time constant value, and obtaining a low-frequency component signal of the primary frequency modulation load instruction based on the adjusted first-order filter.

[0070] Specifically, the first preprocessing further includes:

[0071] The action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction is calculated in combination with the first preset function. The first preset function is expressed as:

[0072] F 1(P) = a 1 ·P 2 +b 1 ·P+c 1

[0073] Among them, F 1 represents the first preset function, P is the target coal-fired unit load, in MW, a 1 、b 1 、c 1 is the identification parameter of the target coal-fired unit, a 1 >0;

[0074] The action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction is expressed as:

[0075] T=F 1 (P)

[0076] Wherein, T represents the action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction.

[0077] It should be noted that since the size of the filter time constant is closely related to the current operating conditions and is a function directly related to the load of the coal-fired unit, the unit operating data is generally obtained by a frequency modulation load command disturbance experiment, and then obtained through unit operating data identification. The identification parameters of the target coal-fired unit can be set according to historical data or expert experience, and are not limited here.

[0078] In the embodiment of the present application, the target grid frequency deviation signal is digital-to-analog converted, and the target grid frequency deviation signal after digital-to-analog conversion is converted into a primary frequency modulation load instruction signal, wherein the primary frequency modulation load instruction signal can be expressed as:

[0079] P f =K G Δf

[0080] Where Δf is the grid frequency deviation, in Hz, K G is the static magnification factor of grid frequency deviation and turbine power change, P f is the primary frequency regulation load instruction, in MW;

[0081] The static amplification factor of grid frequency deviation and turbine power change is expressed as,

[0082] K G =P e / (δ·50)

[0083] Among them, δ is the speed inequality rate, which is generally 4% to 5%; P e It is the rated power of coal-fired unit in MW.

[0084] In the embodiment of the present application, the first-order filter can be operated using a low-pass filter, and the specific filter can use the following expression:

[0085]

[0086] Where, LAG(s) is the first-order filter transfer function; T is the first-order filter time constant; s is the Laplace operator;

[0087]

[0088] Among them, P f is the primary frequency modulation load command signal, P L It is the low-frequency component signal of the primary frequency modulation load instruction.

[0089] It should be noted that adjusting the size of T can change the speed of the main steam valve action, and adjusting the main steam valve action to cause the power generation to change. The larger T is, the smaller the fluctuation of the power generation caused by the main steam valve action is. The time constant is obtained by the coal-fired unit load command through the first preset function F 1 It can be adjusted according to the test parameters. 1 (P) is the specific debugging method of the T parameter.

[0090] It should be noted that the traditional low-pass filter algorithm has a fixed cutoff frequency and simple control, and it is difficult to coordinate the main steam valve and high-pressure steam extraction storage output under different load commands of coal-fired units. Therefore, based on the traditional low-pass filter algorithm, the cutoff frequency of the low-pass filter is adaptively adjusted according to the load command of the coal-fired unit to fully tap the heat storage potential of the heat recovery system of the coal-fired unit under different load commands.

[0091] S102, obtaining a high-pressure steam extraction pipeline valve control signal according to a result of the first preprocessing and in combination with a second preset function;

[0092] Wherein, according to the result of the first preprocessing, in combination with the second preset function, obtaining the high-pressure steam extraction pipeline valve control signal includes: obtaining the difference between the primary frequency modulation load instruction signal and the primary frequency modulation load instruction low-frequency component signal in the result of the first preprocessing, and recording the difference result as the primary frequency modulation load instruction high-frequency component signal;

[0093] Furthermore, a maximum value limiting process is performed on the high frequency component signal of the primary frequency modulation load instruction to obtain a primary frequency modulation load instruction of the high pressure steam extraction valve after the maximum value limiting process;

[0094] Furthermore, according to the primary frequency modulation load instruction of the high-pressure steam extraction valve, in combination with the second preset function, a high-pressure steam extraction pipeline valve control signal is obtained;

[0095] The second preset function is expressed as:

[0096] F 2 (x) = a 2 ·x 2 +b 2 ·x+c 2

[0097] Among them, F 2 represents the second preset function, x represents the primary frequency modulation load instruction of the high-pressure steam extraction valve, the unit is MW, a 2 、b 2 、c 2 represents the opening of the high-pressure steam extraction throttle valve and the load identification parameter, a 2 <0;

[0098] The high-pressure steam extraction pipeline valve control signal is expressed as:

[0099] μ G =F 2 (x)

[0100] Among them, μ G Indicates the high-pressure steam extraction pipeline valve control signal.

[0101] In the embodiment of the present application, the primary frequency modulation load command signal is denoted as P f , the low-frequency component signal of the primary frequency modulation load instruction is recorded as P L , the high frequency component signal of the primary frequency modulation load instruction is recorded as P H ;

[0102] P H =P f -P L

[0103] The primary frequency regulation load instruction of the high-pressure steam extraction valve after the maximum value limit processing is expressed as:

[0104] P H,a =min(P H ,P d )

[0105] Among them, P H,a P is the primary frequency modulation load instruction of the high-pressure steam extraction valve, in MW; d It is the maximum power change that can be obtained by throttling the high-pressure heater extraction steam. It can be obtained based on the unit performance test and the unit is MW.

[0106] Furthermore, the primary frequency modulation load instruction P H,a A high-pressure steam extraction pipeline valve control signal is generated through a second preset function.

[0107] In an optional embodiment, if the regulating valve is fully closed, the maximum output P d=40MW, then this 40MW is the maximum limit; if P H =60MW, then the maximum output of the high-pressure steam extraction valve can only be 60MW, and the remaining 20MW will be given to the main steam valve for output, so that the main steam valve can complete the output of 20MW.

[0108] It should be noted that this step S102 operation can make full use of the energy storage capacity of the high-pressure heater extraction steam, and effectively reduce the action amplitude of the main steam valve during the coal-fired unit's participation in the primary frequency modulation of the power grid, so that the fluctuation of the power generation power caused by the action of the main steam valve is reduced, and at the same time, the response speed of the coal-fired unit participating in the primary frequency modulation of the power grid is improved, the frequency modulation effect is improved, and the stability and economy of the operation of the coal-fired unit are enhanced.

[0109] In addition, the embodiment of the present application also adaptively adjusts the cutoff frequency of the low-pass filter according to the load command of the coal-fired unit, so that the coal-fired unit can better coordinate the main steam valve and the high-pressure steam extraction storage output under different load commands, thereby further improving the performance of the coal-fired unit participating in the primary frequency regulation of the power grid.

[0110] It is worth noting that the method provided in the embodiment of the present application is not only simple and easy to implement, but also has high practicality and reliability. By optimizing the process of coal-fired units participating in the primary frequency regulation of the power grid, the frequency regulation capability of the coal-fired units can be effectively improved, providing a strong guarantee for the stable operation of the power system.

[0111] In an optional embodiment, it is also possible to further explore how to make more refined adjustments and optimizations to the primary frequency regulation strategy according to the actual operating status of the coal-fired units and the grid demand, so as to further improve the effect and performance of the coal-fired units participating in the primary frequency regulation of the grid.

[0112] S103, acquiring a main steam valve control command signal according to a result of the first preprocessing, in combination with a first preset control logic and a PID controller;

[0113] The first preset control logic includes: obtaining the difference between the primary frequency modulation load instruction signal and the primary frequency modulation load instruction low frequency component signal in the result of the first preprocessing, that is, the primary frequency modulation load instruction high frequency component signal;

[0114] Furthermore, a maximum value limiting process is performed on the high frequency component signal of the primary frequency modulation load instruction to obtain a primary frequency modulation load instruction of the high pressure steam extraction valve after the maximum value limiting process;

[0115] Furthermore, the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve is obtained, and the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve is recorded as the high frequency component compensation value of the main steam valve;

[0116] Furthermore, if the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve is a non-positive number, the high frequency component compensation value of the main steam valve is zero, that is, the main steam valve does not need to perform compensation operation;

[0117] Furthermore, if the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve is a positive number, the high frequency component compensation value of the main steam valve is positive.

[0118] Furthermore, the first preset control logic further includes: obtaining the sum of the low-frequency component signal of the primary frequency modulation load instruction and the high-frequency component compensation value of the main steam valve in the result of the first preprocessing, and recording the sum of the low-frequency component signal of the primary frequency modulation load instruction and the high-frequency component compensation value of the main steam valve in the result of the first preprocessing as the primary frequency modulation load instruction of the main steam valve;

[0119] Furthermore, the difference between the real-time output power of the primary frequency regulation of the target coal-fired unit and the load instruction of the primary frequency regulation of the high-pressure steam extraction valve is obtained and recorded as the real-time output power of the primary frequency regulation of the main steam valve.

[0120] Furthermore, according to the result of the first preprocessing, in combination with the first preset control logic and the PID controller, obtaining the main steam valve control command signal includes:

[0121] The main steam valve primary frequency modulation load command is input into the set value interface of the PID controller, the main steam valve primary frequency modulation real-time output power is input into the current value interface of the PID controller, and the main steam valve control command signal is obtained according to the preset PID controller.

[0122] In the embodiment of the present application, the high frequency component compensation value of the main steam valve is denoted as P b , the main steam valve primary frequency modulation load instruction is recorded as P L,r The real-time output power of the main steam valve primary frequency modulation is recorded as P L,act , the target coal-fired unit primary frequency modulation real-time output power is recorded as P f,act ;

[0123] P b =P H -P H,a

[0124] P L,r =P L +P b

[0125] P L,act =P f,act -P H,a

[0126] Among them, the target coal-fired unit primary frequency modulation real-time output power P f,act Obtained from load measuring device.

[0127] It should be noted that by combining the first preset control logic and the PID controller, the main steam valve control command signal can be accurately obtained. First, by obtaining the difference between the high-frequency component signal of the primary frequency modulation load command and the primary frequency modulation load command of the high-pressure steam extraction valve, the high-frequency component compensation value of the main steam valve is obtained, which can ensure that the main steam valve can perform compensation operations in time when necessary to cope with load changes that the high-pressure steam extraction valve cannot meet. Secondly, by taking the sum of the low-frequency component signal of the primary frequency modulation load command and the high-frequency component compensation value of the main steam valve as the primary frequency modulation load command of the main steam valve, the main steam valve can be accurately controlled so that it can act according to the preset load command. Finally, by adjusting the primary frequency modulation load command of the main steam valve and the real-time output power of the primary frequency modulation of the main steam valve in real time through the PID controller, it can ensure that the control effect of the main steam valve is optimized, thereby improving the response speed and stability of the coal-fired unit participating in the primary frequency modulation of the power grid.

[0128] S104, completing the primary frequency modulation control of the target coal-fired unit according to the high-pressure extraction steam pipeline valve control signal and the main steam valve control command signal.

[0129] It should be noted that the valves on the steam extraction pipes connecting the high-pressure cylinder of the steam turbine and the high-pressure heater are all pneumatic control valves.

[0130] Figure 2 In the figure, the valve 1 controlled by the method of the present invention is enclosed by a dotted line. All devices operated based on the method of the present application need to be equipped with the valve 1, or any device with a similar function to the valve 1 that can implement the method of the present invention. Figure 2 As shown in the figure, the main steam valve regulation is a traditional method for thermal power units to adjust load and frequency. Its opening changes have a great impact on the unit's operating parameters, and the heat storage of the direct current boiler is limited, which makes its frequency regulation capability very limited. For supercritical or higher parameter coal-fired units, the high-pressure cylinder is generally equipped with 1-2 levels of high-pressure cylinder extraction steam to heat the feed water of the high-pressure heater. Figure 2 As shown, a pneumatic regulating valve is provided on the high-pressure cylinder extraction pipe to adjust the extraction steam flow. This part of the extraction steam flow enters the steam turbine to quickly and accurately change the unit output, thereby sharing the main steam valve frequency regulation pressure, solving the problem of repeated fluctuations in the unit operating parameters caused by the main steam valve frequently responding to a frequency regulation. At the same time, it reduces the wear of the unit's main steam valve, smoothes the output power of the thermal power unit, and effectively improves the unit's frequency regulation flexibility.

[0131] In an optional embodiment, if Figure 3The figure shows a control logic diagram of a primary frequency modulation control method and system of a high-pressure steam extraction throttling auxiliary coal-fired unit provided by an embodiment of the present invention, which includes eighteen specific operation steps, and all the steps are designed for operation based on the primary frequency modulation control method of a high-pressure steam extraction throttling auxiliary coal-fired unit of the present invention. The specific operation can be expressed as follows:

[0132] Process 1: The grid frequency deviation signal is detected by the measuring device and converted into digital and analog signals, and then the processed signal is transmitted to the speed regulator;

[0133] Process 2: The speed regulator converts the frequency signal into a primary frequency modulation load command signal (including frequency modulation dead zone and speed modulation inequality and other parameter settings), and sends the signal to the first-order filter;

[0134] Process 3: Send the primary frequency modulation load command signal of process 2 to the deviation calculation module. The deviation calculation module here is the operation of solving the difference in the implementation method;

[0135] Process 4: Send the coal-fired unit load command signal to the function generator processing unit F 1 (P), the function generator processing unit F 1 (P) is a processing unit carrying the first preset function;

[0136] Step 5: In F 1 In (P), according to the real-time different coal-fired unit load instructions sent in, the action time constant value of the first-order filter is calculated, and the result is sent to the first-order filter;

[0137] Process 6: According to the real-time time constant, the first-order filter performs low-pass filtering on the primary frequency modulation load instruction signal, converts it into a primary frequency modulation load instruction low-frequency component signal, and sends the result to the adder;

[0138] Process 7: Send the low-frequency component signal of the primary frequency modulation load instruction formed in process 6 to the deviation calculation module;

[0139] Process 8: Subtract the primary frequency modulation load instruction signal from the primary frequency modulation load instruction low frequency component signal to generate a primary frequency modulation load instruction high frequency component signal, and send it to the high amplitude limit module, where the high amplitude limit module is the module that carries the maximum value limit processing operation in the first preset control logic;

[0140] Process 9: sending the high frequency component signal of the primary frequency modulation load instruction to the deviation calculation module;

[0141] Process 10: After the high-limit module performs maximum value limiting processing on the high-frequency component of the primary frequency modulation load instruction, it generates the primary frequency modulation load instruction of the high-pressure steam extraction valve and sends it to the function generator processing unit F 2(x), the function generator processing unit F 2 (x) is a processing unit carrying the second preset function;

[0142] Process 11: sending the primary frequency modulation load instruction of the high-pressure steam extraction valve formed in process 10 to the deviation calculation module;

[0143] Process 12: subtract the high-frequency component signal of the secondary frequency modulation load instruction sent in process 9 from the primary frequency modulation load instruction of the high-pressure steam extraction valve sent in process 11 to obtain the high-frequency component compensation value of the main steam valve, and send it to the adder. The adder is a module that implements the sum operation of the low-frequency component signal of the primary frequency modulation load instruction and the high-frequency component compensation value of the main steam valve in this method;

[0144] Process 13: The adder adds the low-frequency component signal of the primary frequency modulation load instruction sent in process 6 and the high-frequency component compensation value of the main steam valve sent in process 12 to obtain the primary frequency modulation load instruction of the main steam valve, and sends it to the set value interface of the PID controller;

[0145] Process 14: sending the primary frequency modulation load instruction of the high-pressure steam extraction valve generated in process 10 to the deviation calculation module;

[0146] Process 15: sending the real-time output power of the primary frequency regulation of the coal-fired unit to the deviation calculation module;

[0147] Process 16: The deviation calculation module processes the primary frequency modulation real-time output power of the coal-fired unit and the primary frequency modulation load instruction of the high-pressure steam extraction valve to obtain the primary frequency modulation real-time output power of the main steam valve and send it to the current value interface of the PID controller;

[0148] Process 17: After PID processing, a control command signal for the main steam valve is generated;

[0149] Step 18: In F 2 In (x), the control signal of the high-pressure steam extraction pipeline valve is calculated based on the input high-pressure steam extraction valve primary frequency modulation load instruction and the fitted relationship between the high-pressure steam extraction valve load and opening.

[0150] In summary, the present invention proposes a method for primary frequency regulation control of a coal-fired unit assisted by high-pressure steam extraction throttling, obtains a target power grid frequency deviation signal and a target coal-fired unit load instruction, and performs a first preprocessing on the target power grid frequency deviation signal and the target coal-fired unit load instruction, the result of the first preprocessing at least includes a primary frequency regulation load instruction signal and a primary frequency regulation load instruction low-frequency component signal; according to the result of the first preprocessing, combined with the second preset function, obtain a high-pressure steam extraction pipeline valve control signal; according to the result of the first preprocessing, combined with the first preset control logic and the PID controller, obtain a main steam valve control instruction signal; according to the high-pressure steam extraction pipeline valve control signal and the main steam valve control instruction signal, complete the primary frequency regulation control of the target coal-fired unit. The high-pressure heater extraction throttling of the method of the present invention can adjust the extraction flow rate entering the high-pressure heater from the high-pressure cylinder by changing the opening of the high-pressure steam extraction valve, directly change the unit load, and respond faster to frequency changes, which can effectively improve the unit frequency regulation performance. The high-pressure heater extraction throttling gives priority to responding to the high-frequency components in the unit's primary frequency regulation instructions, which can effectively reduce the number of times the unit's main steam valve operates and reduce the wear of the unit's main steam valve. The contribution of the high-pressure heater extraction throttling to respond to the primary frequency regulation load is mainly in the early stage of frequency change. The more power contributed in the early stage, the smoother the amplitude of the main steam valve of the thermal power unit, which can effectively suppress the repeated fluctuations in the unit's output power. The high-pressure heater extraction throttling is a primary frequency regulation method that starts from the coal-fired unit itself and quickly releases the unit's stored heat and converts it into output. It is simple to construct, highly automated, compatible with existing system hardware, does not require additional equipment, has a short recovery cycle, and has a wide range of applications.

[0151] In a preferred embodiment, a primary frequency regulation control system of a high-pressure steam extraction throttling auxiliary coal-fired unit comprises:

[0152] A first preprocessing module is used to obtain a target power grid frequency deviation signal and a target coal-fired unit load instruction, and perform a first preprocessing on the target power grid frequency deviation signal and the target coal-fired unit load instruction, wherein the result of the first preprocessing includes at least a primary frequency modulation load instruction signal and a primary frequency modulation load instruction low-frequency component signal;

[0153] A first control signal acquisition module, used to acquire a high-pressure steam extraction pipeline valve control signal according to a result of the first preprocessing and in combination with a second preset function;

[0154] A second control signal acquisition module is used to acquire a main steam valve control command signal according to a result of the first preprocessing, in combination with the first preset control logic and the PID controller;

[0155] The frequency modulation control module is used to complete the primary frequency modulation control of the target coal-fired unit according to the high-pressure extraction steam pipeline valve control signal and the main steam valve control command signal.

[0156] The above-mentioned unit modules may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above-mentioned modules.

[0157] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 5 As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an 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 the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a primary frequency modulation control method for a high-pressure steam extraction throttling auxiliary coal-fired unit is implemented. The display screen of the computer device 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 covered on the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0158] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0159] Obtaining a target power grid frequency deviation signal and a target coal-fired unit load instruction, and performing a first preprocessing on the target power grid frequency deviation signal and the target coal-fired unit load instruction, wherein the result of the first preprocessing includes at least a primary frequency modulation load instruction signal and a primary frequency modulation load instruction low-frequency component signal;

[0160] According to the result of the first preprocessing and in combination with the second preset function, a high-pressure steam extraction pipeline valve control signal is obtained;

[0161] According to the result of the first preprocessing, in combination with the first preset control logic and the PID controller, a main steam valve control command signal is obtained;

[0162] According to the high-pressure extraction steam pipeline valve control signal and the main steam valve control command signal, the primary frequency regulation control of the target coal-fired unit is completed.

[0163] Example 2

[0164] Reference Figure 4, which is an embodiment of the present invention, provides a primary frequency regulation control method and system for a high-pressure steam extraction throttling auxiliary coal-fired unit. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0165] like Figure 4 The figure shows the primary frequency regulation control method and system action of a 660MW coal-fired unit assisted by extraction throttling of a high-pressure heater. When the frequency deviation changes continuously, the main steam valve opening change, the high-pressure heater extraction valve opening change, and the load change. The specific analysis is as follows:

[0166] At 4s, the system input is as follows Figure 4 After the continuously changing positive frequency deviation shown in the figure, the high-pressure steam extraction valve is closed from 100 to 73 in response to the high-frequency component of the instantaneous frequency deviation, and the opening of the high-pressure steam extraction valve is adjusted between 93 and 100 according to the high-frequency component.

[0167] The main steam valve opening of the thermal power unit fluctuates less than before the control strategy optimization, reducing by about 20%;

[0168] The load variation of the thermal power unit in response to primary frequency modulation becomes smoother than before optimization, and the peak value of output power fluctuation decreases by about 4%.

[0169] In summary, the control method and system of this patent can effectively suppress the repeated fluctuation of output power caused by frequent operation of the main steam valve of the thermal power unit due to high-frequency signals, smooth the output power of the thermal power unit, and alleviate the frequency regulation pressure of the main steam valve of the thermal power unit.

[0170] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0171] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0172] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0173] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0174] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0175] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0176] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A primary frequency modulation control method for a high-pressure steam extraction throttling auxiliary coal-fired unit, characterized in that: include: Obtaining a target power grid frequency deviation signal and a target coal-fired unit load instruction, and performing a first preprocessing on the target power grid frequency deviation signal and the target coal-fired unit load instruction, wherein the result of the first preprocessing includes at least a primary frequency modulation load instruction signal and a primary frequency modulation load instruction low-frequency component signal; According to the result of the first preprocessing and in combination with the second preset function, a high-pressure steam extraction pipeline valve control signal is obtained; According to the result of the first preprocessing, in combination with the first preset control logic and the PID controller, a main steam valve control command signal is obtained; According to the high-pressure steam extraction pipeline valve control signal and the main steam valve control command signal, the primary frequency modulation control of the target coal-fired unit is completed.

2. The primary frequency modulation control method of a high-pressure steam extraction throttling auxiliary coal-fired unit according to claim 1, characterized in that: The first preprocessing includes performing digital-to-analog conversion on the target power grid frequency deviation signal, and converting the target power grid frequency deviation signal after the digital-to-analog conversion into a primary frequency regulation load instruction signal; The first preprocessing also includes calculating the action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction in combination with the first preset function, adjusting the first-order filter parameters according to the time constant value, and obtaining a low-frequency component signal of the primary frequency modulation load instruction based on the adjusted first-order filter.

3. The primary frequency modulation control method of a high-pressure steam extraction throttling auxiliary coal-fired unit according to claim 2, characterized in that: The first preprocessing further comprises: The action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction is calculated in combination with the first preset function, and the first preset function is expressed as: F1(P)=a1·P 2 +b1·P+c1 Wherein, F1 represents the first preset function, P represents the target coal-fired unit load, in MW, a1, b1, c1 represent the target coal-fired unit identification parameters, and a1>0; The action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction is expressed as: T=F1(P) Wherein, T represents the action time constant value of the first-order filter corresponding to the target coal-fired unit load instruction.

4. The primary frequency modulation control method of a high-pressure steam extraction throttling auxiliary coal-fired unit according to claim 3, characterized in that: The step of obtaining the high-pressure steam extraction pipeline valve control signal according to the result of the first preprocessing and in combination with the second preset function comprises: Obtaining the difference between the primary frequency modulation load instruction signal and the primary frequency modulation load instruction low-frequency component signal in the result of the first preprocessing, and recording the difference result as the primary frequency modulation load instruction high-frequency component signal; Performing maximum value limiting processing on the high frequency component signal of the primary frequency modulation load instruction to obtain the primary frequency modulation load instruction of the high pressure steam extraction valve after the maximum value limiting processing; According to the primary frequency modulation load instruction of the high-pressure steam extraction valve, in combination with the second preset function, a high-pressure steam extraction pipeline valve control signal is obtained; The second preset function is expressed as: F2(x)=a2·x 2 +b2·x+c2 Wherein, F2 represents the second preset function, x represents the primary frequency modulation load instruction of the high-pressure steam extraction valve, the unit is MW, a2, b2, c2 represent the opening degree of the high-pressure steam extraction throttle valve and the load identification parameters, and a2<0; The high-pressure steam extraction pipeline valve control signal is expressed as: μ G =F2(x) Among them, μ G Indicates the high-pressure steam extraction pipeline valve control signal.

5. The primary frequency modulation control method of a high-pressure steam extraction throttling auxiliary coal-fired unit according to claim 4, characterized in that: The first preset control logic includes: Obtaining the difference between the primary frequency modulation load instruction signal and the primary frequency modulation load instruction low-frequency component signal in the result of the first preprocessing, that is, the primary frequency modulation load instruction high-frequency component signal; Performing maximum value limiting processing on the high frequency component signal of the primary frequency modulation load instruction to obtain the primary frequency modulation load instruction of the high pressure steam extraction valve after the maximum value limiting processing; Obtaining a difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve, and recording the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve as a main steam valve high frequency component compensation value; If the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve is a non-positive number, the high frequency component compensation value of the main steam valve is zero, that is, the main steam valve does not need to perform compensation operation; If the difference between the high frequency component signal of the primary frequency modulation load instruction and the primary frequency modulation load instruction of the high pressure heater extraction valve is a positive number, the high frequency component compensation value of the main steam valve is positive.

6. The primary frequency modulation control method of a high-pressure steam extraction throttling auxiliary coal-fired unit according to claim 5, characterized in that: The first preset control logic also includes: Obtaining the sum of the low-frequency component signal of the primary frequency modulation load instruction in the result of the first preprocessing and the high-frequency component compensation value of the main steam valve, and recording the sum of the low-frequency component signal of the primary frequency modulation load instruction in the result of the first preprocessing and the high-frequency component compensation value of the main steam valve as the primary frequency modulation load instruction of the main steam valve; The difference between the target coal-fired unit primary frequency regulation real-time output power and the high-pressure steam extraction valve primary frequency regulation load instruction is obtained and recorded as the main steam valve primary frequency regulation real-time output power.

7. The primary frequency modulation control method of a high-pressure steam extraction throttling auxiliary coal-fired unit according to claim 6, characterized in that: The obtaining of the main steam valve control command signal according to the result of the first preprocessing in combination with the first preset control logic and the PID controller comprises: The main steam valve primary frequency modulation load instruction is input into the set value interface of the PID controller, the main steam valve primary frequency modulation real-time output power is input into the current value interface of the PID controller, and the main steam valve control instruction signal is obtained according to the preset PID controller.

8. A primary frequency regulation control system for a high-pressure steam extraction throttling auxiliary coal-fired unit, characterized in that: include: A first preprocessing module, used for obtaining a target grid frequency deviation signal and a target coal-fired unit load instruction, and performing a first preprocessing on the target grid frequency deviation signal and the target coal-fired unit load instruction, wherein the result of the first preprocessing includes at least a primary frequency modulation load instruction signal and a primary frequency modulation load instruction low-frequency component signal; A first control signal acquisition module, used to acquire a high-pressure steam extraction pipeline valve control signal according to the result of the first preprocessing and in combination with a second preset function; A second control signal acquisition module, used to acquire a main steam valve control command signal according to the result of the first preprocessing, in combination with a first preset control logic and a PID controller; The frequency modulation control module is used to complete the primary frequency modulation control of the target coal-fired unit according to the high-pressure steam extraction pipeline valve control signal and the main steam valve control command signal.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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