Control method and device for assisting primary frequency modulation through boiler desuperheating water grading

Abstract

The invention provides a control method and device for assisting primary frequency modulation through boiler desuperheating water grading. The method comprises the steps that the rotating speed of a generator set and the boiler steam temperature are obtained and monitored in real time; when it is monitored that the rotating speed exceeds a preset action threshold value and the deviation between the steam temperature and a set value is within a safety threshold value range, according to the degree that the rotating speed deviates from the threshold value, an adjusting instruction for conducting graded pulse type adjusting on a first-stage superheater attemperation water adjusting valve and a second-stage superheater attemperation water adjusting valve of the boiler is generated; performing primary frequency modulation by using the auxiliary unit; the adjusting instruction is directly superposed to an original control instruction of the attemperation water adjusting valve to be output and executed; and after the primary frequency modulation reaches a preset target, the boiler attemperation water regulating valve is controlled to stably recover to the position before the auxiliary action at a preset recovery rate.

Description

Technical Field

[0001] This application relates to the field of power frequency regulation control technology, and in particular to a control method and device for primary frequency regulation using boiler desuperheating water in stages. Background Technology

[0002] Currently, the proportion of renewable energy generation is rapidly increasing. Due to the volatility and instability of renewable energy, the power system places higher demands on the frequency regulation capabilities of traditional thermal power units. The primary frequency regulation of thermal power units is the "first line of defense" for grid frequency stability. It responds quickly to frequency changes and adjusts active power output through the unit's own speed regulation system, which is crucial for ensuring grid security.

[0003] Currently, primary frequency regulation in thermal power units mainly relies on the rapid action of turbine control valves according to specific control logic. This is typically achieved through a joint design of logic on both the Digital Electro-Hydraulic Control System (DEH) and the Distributed Control System (DCS) side. The DEH side directly generates valve position increment commands via speed difference signals to ensure rapid frequency regulation; the DCS side generates frequency regulation load commands through a frequency correction loop to ensure continuous frequency regulation. The core of this approach lies in responding to load adjustment demands through the rapid action of turbine valves.

[0004] Although existing technical solutions provide a basic framework for primary frequency modulation, their performance is limited by a variety of factors and has obvious shortcomings:

[0005] First, conventional primary frequency regulation schemes heavily rely on the boiler's heat storage capacity and the turbine's valve position margin. Under different operating conditions, the load response effect produced by the same valve actuation varies greatly, leading to unstable frequency regulation performance and a tendency for indicators to fail to meet standards.

[0006] Secondly, conventional primary frequency regulation schemes are ineffective under both high and low loads. When the unit operates at lower loads, the pressure and temperature of the main steam are also relatively low. Even if the turbine valves are adjusted to the same opening degree as under high load conditions, it is difficult to achieve the expected power change and meet the primary frequency regulation requirements. When the unit operates at high loads, the turbine valves are already at a relatively high opening degree. Due to the valve flow characteristics, when the valve position is high, the valve's ability to regulate the load is weakened, resulting in poor primary frequency regulation and making it easy for the performance indicators to fail to meet the requirements.

[0007] Therefore, the existing technology, which relies solely on adjusting turbine valves, has limitations in frequency regulation under different operating conditions. In particular, when the unit is in a high-load or low-load range, it is difficult to continuously and stably meet the increasingly stringent primary frequency regulation performance requirements of the power grid. Summary of the Invention

[0008] In view of this, this application provides a control method and apparatus for primary frequency regulation using boiler desuperheating water staged to solve at least one of the aforementioned problems.

[0009] To achieve the above objectives, this application adopts the following approach:

[0010] According to a first aspect of this application, a control method for primary frequency regulation using boiler desuperheating water staged auxiliary frequency regulation is provided, the method comprising:

[0011] Real-time acquisition and monitoring of generator set speed and boiler steam temperature;

[0012] When the rotational speed is detected to exceed the preset action threshold, and the deviation of the steam temperature from the set value is within the safety threshold range, an adjustment command is generated to perform graded pulse-type adjustment on the boiler's primary superheater desuperheating water regulating valve and the secondary superheater desuperheating water regulating valve, based on the degree of deviation of the rotational speed from the threshold.

[0013] The adjustment command is directly superimposed onto the original control command of the desuperheating water regulating valve for output and execution;

[0014] After the frequency adjustment reaches the preset target, the boiler desuperheating water regulating valve is controlled to smoothly return to the position before the auxiliary action at a preset recovery rate.

[0015] In one embodiment of this application, the method described above generates control commands for graded pulse-type regulation of the boiler's primary superheater desuperheating water control valve and secondary superheater desuperheating water control valve, specifically including:

[0016] When the rotational speed is lower than the preset frequency reduction action threshold, a load increase regulation command is generated to rapidly open the primary superheater desuperheating water regulating valve and the secondary superheater desuperheating water regulating valve in a rate-unrestricted manner.

[0017] When the rotational speed is higher than the preset frequency increase threshold, a load reduction regulation command is generated to quickly close the desuperheating water regulating valve of the first-stage superheater and the desuperheating water regulating valve of the second-stage superheater in a rate-unrestricted manner.

[0018] In one embodiment of this application, the opening degree of the rapid opening in the above method is set in stages according to the degree to which the rotational speed is lower than the frequency reduction action threshold, and the opening degree of the rapid closing is set in stages according to the degree to which the rotational speed is higher than the frequency increase action threshold.

[0019] In one embodiment of this application, the opening degree of rapid opening in the above method is set in stages according to the degree to which the rotational speed is lower than the frequency reduction action threshold, including:

[0020] When the rotational speed is lower than the first frequency reduction threshold but higher than the second frequency reduction threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the first preset load increase opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the second preset load increase opening.

[0021] When the rotational speed is lower than the second frequency reduction threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the third preset load increase opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the fourth preset load increase opening. The third preset load increase opening is greater than the first preset load increase opening, and the fourth preset load increase opening is greater than the second preset load increase opening.

[0022] In one embodiment of this application, the opening degree of rapid closing in the above method is set in stages according to the degree to which the rotational speed exceeds the frequency up-action threshold, including:

[0023] When the rotational speed is higher than the first frequency increase threshold but lower than the second frequency increase threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the first preset load reduction opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the second preset load reduction opening.

[0024] When the rotational speed is higher than the second frequency increase threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the third preset load reduction opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the fourth preset load reduction opening. The absolute value of the third preset load reduction opening is greater than the absolute value of the first preset load reduction opening, and the absolute value of the fourth preset load reduction opening is greater than the absolute value of the second preset load reduction opening.

[0025] In one embodiment of this application, the above method involves directly superimposing the adjustment command onto the original control command of the desuperheating water regulating valve for output, including:

[0026] The adjustment command is superimposed on the manual / automatic operation station after the original PID controller, and directly acts on the final execution command of the desuperheating water regulating valve.

[0027] In one embodiment of this application, the preset recovery rate in the above method is less than or equal to 10% / min, so as to reduce system disturbance during the recovery process of the boiler desuperheating water regulating valve.

[0028] In one embodiment of this application, the above method further includes: modifying or adjusting the action threshold, the graded opening degree, the safety threshold, and the recovery rate online according to the actual operating characteristics of the unit.

[0029] According to a second aspect of this application, a control device for primary frequency regulation assisted by boiler desuperheating water gradation is provided, the device comprising:

[0030] The real-time monitoring unit is used to acquire and monitor the generator set speed and boiler steam temperature in real time.

[0031] The adjustment command generation unit is used to generate adjustment commands for graded pulse-type adjustment of the boiler's primary superheater desuperheating water regulating valve and secondary superheater desuperheating water regulating valve according to the degree of deviation of the speed from the threshold when the detected speed exceeds the preset action threshold and the deviation of the steam temperature from the set value is within the safety threshold range, so as to assist the unit in performing primary frequency regulation.

[0032] The instruction superposition unit is used to directly superimpose the adjustment instruction onto the original control instruction of the desuperheating water regulating valve for output and execution.

[0033] The recovery unit is used to control the boiler desuperheating water regulating valve to smoothly return to the position before the auxiliary action at a preset recovery rate after the frequency adjustment reaches the preset target.

[0034] In one embodiment of this application, the adjustment instruction generation unit includes:

[0035] The load increase adjustment module is used to generate a load increase adjustment command that causes the first-stage superheater desuperheating water regulating valve and the second-stage superheater desuperheating water regulating valve to open rapidly without rate limit when the rotational speed is lower than the preset frequency reduction action threshold.

[0036] The load reduction adjustment module is used to generate a load reduction adjustment command when the rotational speed is higher than the preset frequency increase action threshold, so that the first-stage superheater desuperheating water regulating valve and the second-stage superheater desuperheating water regulating valve can be quickly closed in a rate-unrestricted manner.

[0037] In one embodiment of this application, the opening degree of the load increase adjustment module is set in stages according to the degree to which the rotational speed is lower than the frequency reduction action threshold, and the opening degree of the load reduction adjustment module is set in stages according to the degree to which the rotational speed is higher than the frequency increase action threshold.

[0038] In one embodiment of this application, the opening degree of the aforementioned load increase adjustment module is set in stages according to the degree to which the rotational speed is lower than the frequency reduction action threshold, including:

[0039] When the rotational speed is lower than the first frequency reduction threshold but higher than the second frequency reduction threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the first preset load increase opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the second preset load increase opening.

[0040] When the rotational speed is lower than the second frequency reduction threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the third preset load increase opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the fourth preset load increase opening. The third preset load increase opening is greater than the first preset load increase opening, and the fourth preset load increase opening is greater than the second preset load increase opening.

[0041] In one embodiment of this application, the opening degree of the rapid shutdown of the aforementioned load reduction adjustment module is set in stages according to the degree to which the rotational speed exceeds the frequency increase action threshold, including:

[0042] When the rotational speed is higher than the first frequency increase threshold but lower than the second frequency increase threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the first preset load reduction opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the second preset load reduction opening.

[0043] When the rotational speed is higher than the second frequency increase threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the third preset load reduction opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the fourth preset load reduction opening. The absolute value of the third preset load reduction opening is greater than the absolute value of the first preset load reduction opening, and the absolute value of the fourth preset load reduction opening is greater than the absolute value of the second preset load reduction opening.

[0044] In one embodiment of this application, the instruction overlay unit is specifically used for:

[0045] The adjustment command is superimposed on the manual / automatic operation station after the original PID controller, and directly acts on the final execution command of the desuperheating water regulating valve.

[0046] In one embodiment of this application, the preset recovery rate is less than or equal to 10% / min, so as to reduce system disturbances during the recovery process of the boiler desuperheating water regulating valve.

[0047] In one embodiment of this application, the above-mentioned device further includes: a modification and setting unit, used to modify or set the action threshold, the graded opening degree, the safety threshold and the recovery rate online according to the actual operating characteristics of the unit.

[0048] According to a third aspect of this application, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described above.

[0049] According to a fourth aspect of this application, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the above-described method.

[0050] According to a fifth aspect of this application, a computer program product is provided, comprising a computer program / instructions that, when executed by a processor, implement the steps of the above-described method.

[0051] As described above, the control method and device for primary frequency regulation using boiler desuperheating water in this application directly and effectively assists the unit in primary frequency regulation through the rapid, staged action of the boiler desuperheating water regulating valve, directly improving regulation quality and thus enhancing the primary frequency regulation performance of the thermal power unit and its profitability. Furthermore, while improving frequency regulation performance, this application fully considers system safety. By setting a safe steam temperature threshold, it ensures that the auxiliary action will not cause significant steam temperature fluctuations that could threaten unit safety. Simultaneously, after the regulating valve action, a fast-acting, slow-return recovery method is adopted, restoring smoothly at a slower rate, reducing disturbance to the system and ensuring the safety and stability of the desuperheating water regulation process. The solution proposed in this application can be directly implemented in the existing DCS by modifying the control logic configuration without adding new hardware. This approach minimizes the workload of modification, simplifies implementation, and has strong practicality and promotional value. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0053] Figure 1 This is a schematic flowchart of a control method for primary frequency regulation using boiler desuperheating water staged to assist in the implementation of this application.

[0054] Figure 2 This is a schematic diagram of the boiler desuperheating water system;

[0055] Figure 3 This is a schematic flowchart illustrating the generation of adjustment instructions provided in an embodiment of this application;

[0056] Figure 4This is a flowchart illustrating the process of setting the opening degree of rapid opening in a hierarchical manner according to an embodiment of this application;

[0057] Figure 5 This is a flowchart illustrating the process of setting the opening degree of rapid closing in a tiered manner according to an embodiment of this application;

[0058] Figure 6 This is a schematic diagram of the auxiliary primary frequency regulation control method for the desuperheating water of the boiler's primary superheater;

[0059] Figure 7 This is a schematic diagram of the auxiliary primary frequency regulation control method for the desuperheating water of the boiler's secondary superheater;

[0060] Figure 8 This is a schematic diagram of a control device for primary frequency regulation using boiler desuperheating water tiered assistance, provided in an embodiment of this application.

[0061] Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and their descriptions are used to explain this application, but are not intended to limit this application.

[0063] like Figure 1 The diagram shown is a flowchart illustrating a control method for primary frequency regulation using boiler desuperheating water staged to assist in the implementation of this application. The method includes the following steps:

[0064] Step S101: Real-time acquisition and monitoring of generator set speed and boiler steam temperature.

[0065] The generator set speed is a key indicator for determining whether the grid frequency has deviated. In the power grid, assuming the rated frequency is 50Hz, the corresponding synchronous speed is 3000rpm. The control system will continuously monitor this speed value to determine whether a frequency regulation action needs to be initiated.

[0066] Boiler steam temperature is a critical parameter for ensuring the safe operation of the boiler. Since this application requires the use of desuperheating water for regulation, and the main function of desuperheating water is to control steam temperature, it is necessary to monitor the main steam temperature and its deviation from the set value in real time to ensure that the auxiliary frequency regulation operation does not cause the steam temperature to exceed the allowable safe fluctuation range (e.g., ±5℃ to ±10℃ from the set value).

[0067] Step S102: When the rotation speed is detected to exceed the preset action threshold and the deviation of the steam temperature from the set value is within the safe threshold range, an adjustment command is generated to perform graded pulse-type adjustment of the boiler's primary superheater desuperheating water regulating valve and the secondary superheater desuperheating water regulating valve according to the degree of deviation of the rotation speed from the threshold, so as to assist the unit in performing primary frequency regulation.

[0068] This step is the core of the control strategy. When the triggering conditions are met, the control system will generate a graded, pulse-like adjustment command.

[0069] The triggering conditions here include: the speed exceeding the threshold, that is, the unit speed deviates from the normal dead zone range (such as above 3002.2 rpm or below 2997.8 rpm), indicating that there is a fluctuation in the grid frequency that requires a response; at the same time, the steam temperature is within the safe range, that is, the deviation between the actual value and the set value of the main steam temperature does not exceed the preset safety threshold, which can ensure that the boiler is able to withstand the additional temperature disturbance caused by adjusting the desuperheating water.

[0070] Graded regulation means the control system determines the actuation range of the desuperheating water regulating valve based on the severity of the speed deviation. Pulse regulation refers to generating a regulation command as a time-limited pulse signal. For example, this command, upon triggering, will cause the valve to actuate and remain actuated for 10 seconds. This short, rapid action is designed to provide a quick initial response for primary frequency regulation without excessively or prolongedly interfering with regular temperature control. The regulation command targets the boiler's primary superheater desuperheating water regulating valve and secondary superheater desuperheating water regulating valve, such as... Figure 2 The diagram shown is of the boiler desuperheating water system. Figure 2 As can be seen, boiler desuperheating water includes reheater desuperheating water and superheater desuperheating water. This application focuses on superheater desuperheating water, which can be further divided into primary superheater desuperheating water and secondary superheater desuperheating water. Both primary and secondary superheater desuperheating water generally originate from the feedwater system, flowing out after the boiler feedwater main valve and before the feedwater regulating valve. Primary superheater desuperheating water is located on the connecting pipe between the outlet of the front superheater and the inlet of the rear superheater, used to protect the wall temperature of the screen-type superheater tubes, prevent exceeding limits, and provide coarse adjustment of the main steam temperature. Secondary superheater desuperheating water is located on the connecting pipe between the outlet of the rear superheater and the inlet of the final superheater, serving as the final adjustment to the steam temperature and playing a fine-tuning role.

[0071] Step S103: The adjustment command is directly superimposed onto the original control command of the desuperheating water regulating valve for output and execution.

[0072] The adjustment command generated in step S102 will be directly superimposed on the original control command of the desuperheating water regulating valve. Specifically, this superposition point is located after the conventional PID controller and the manual / automatic operator station (M / A manual station), directly acting on the final command sent to the valve actuator. This superposition method ensures that the auxiliary frequency regulation command receives the highest execution priority regardless of whether the original system is in automatic or manual control mode.

[0073] To ensure rapid response, the valve opening or closing action is not subject to rate limits, allowing for quick opening or closing, thereby rapidly affecting the steam enthalpy and pressure, and achieving the goal of quickly changing the unit's power output.

[0074] Step S104: After the preset target is reached by frequency adjustment, the boiler desuperheating water regulating valve is controlled to smoothly return to the position before the auxiliary action at a preset recovery rate.

[0075] The preset target here refers to the speed returning to the normal range. At this point, the auxiliary frequency adjustment action can end. After the auxiliary action ends, the control system will instruct the desuperheating water regulating valve to return smoothly from its position after the action to its position before the action at a preset, slower recovery rate.

[0076] As described above, the control method proposed in this application, which utilizes boiler desuperheating water to assist primary frequency regulation in a staged manner, can directly and effectively assist the unit in primary frequency regulation through the rapid, staged action of the boiler desuperheating water regulating valve. This directly improves the regulation quality, thereby enhancing the primary frequency regulation performance of the thermal power unit and increasing its profitability. Furthermore, while improving frequency regulation performance, this application fully considers system safety. By setting a safe steam temperature threshold, it ensures that the auxiliary action will not cause significant steam temperature fluctuations that could threaten unit safety. Simultaneously, after the regulating valve action, a fast-acting, slow-return recovery method is adopted, restoring smoothly at a relatively slow rate, reducing disturbances to the system and ensuring the safety and stability of the desuperheating water regulation process. The solution proposed in this application can be directly implemented in the existing DCS by modifying the control logic configuration, without adding new hardware. This approach minimizes the workload of modification, simplifies implementation, and has strong practicality and promotional value.

[0077] In one embodiment of this application, such as Figure 3 As shown, step S102 above generates a control command for graded pulse-type regulation of the boiler's primary superheater desuperheating water control valve and secondary superheater desuperheating water control valve, specifically including:

[0078] Step S1021: When the rotational speed is lower than the preset frequency reduction action threshold, a load increase adjustment command is generated to quickly open the primary superheater desuperheating water regulating valve and the secondary superheater desuperheating water regulating valve in a rate-unrestricted manner.

[0079] This step corresponds to the operating condition where the grid frequency decreases and the generator set needs to increase output (load increase). The trigger condition for this activation command is: the unit speed is lower than the preset frequency reduction action threshold (e.g., 2997.8 rpm), and at the same time, the deviation between the boiler steam temperature and the set value is within the allowable safety threshold range. This activation command does not have a rate limit to ensure that the valve can act instantaneously and quickly increase the water spray volume. Increasing the water spray will reduce the enthalpy of the superheated steam. In order to maintain power, the boiler needs to increase fuel. At the same time, this process will also have a rapid impact on the main steam pressure, thereby quickly increasing the unit power and assisting in primary frequency regulation.

[0080] Step S1022: When the rotational speed is higher than the preset frequency increase action threshold, a load reduction regulation command is generated to quickly close the primary superheater desuperheating water regulating valve and the secondary superheater desuperheating water regulating valve in a rate-unrestricted manner.

[0081] This step corresponds to the operating condition where the grid frequency increases and the unit needs to reduce output (load reduction). The trigger condition for this shutdown command is that the unit speed is higher than the preset frequency increase threshold (e.g., 3002.2 rpm), and at the same time, the deviation of the boiler steam temperature from the set value is within the allowable safety threshold range. Similarly, this shutdown command does not have a rate limit to achieve rapid valve closing. Rapidly reducing the water spray will cause the steam temperature to tend to rise and the steam enthalpy to increase, thereby causing the unit power to drop rapidly, achieving the purpose of auxiliary load reduction and frequency regulation.

[0082] In another embodiment of this application, the opening degree of rapid opening in step S1021 is set in stages according to the degree to which the rotational speed is lower than the frequency reduction action threshold. Specifically, as follows: Figure 4 As shown, it may further include:

[0083] Step S401: When the rotational speed is lower than the first frequency reduction threshold but higher than the second frequency reduction threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the first preset load increase opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the second preset load increase opening.

[0084] This situation occurs when the grid frequency drops slightly and the unit speed just falls below the threshold that requires a response, but the deviation is not serious.

[0085] The first frequency reduction threshold here can be, for example, 2997.8 rpm, and the second frequency reduction threshold can be, for example, 2997.5 rpm. When the unit speed enters the range of 2997.5 rpm to 2997.8 rpm, the control system determines that a first-level response is required. At this time, the control system generates a command to open the first-level superheater desuperheating water regulating valve and the second-level superheater desuperheating water regulating valve. The change in the opening of the first-level superheater desuperheating water regulating valve is set to the first preset load increase opening, for example, 5%, and the change in the opening of the second-level superheater desuperheating water regulating valve is set to the second preset load increase opening, for example, 3%. This is a relatively mild auxiliary adjustment action.

[0086] Step S402: When the rotational speed is lower than the second frequency reduction threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the third preset load increase opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the fourth preset load increase opening, wherein the third preset load increase opening is greater than the first preset load increase opening, and the fourth preset load increase opening is greater than the second preset load increase opening.

[0087] This situation occurs when the grid frequency drops significantly and the unit speed falls below a lower threshold, indicating a more urgent situation requiring a stronger response.

[0088] When the unit speed drops below 2997.5 rpm, the control system determines that a secondary response is required. At this time, the control system generates a larger valve opening command. The opening change of the primary superheater desuperheating water regulating valve is set to the third preset load increase opening, for example, 8%. This 8% opening change is greater than the first-stage 5%, and the opening change of the secondary superheater desuperheating water regulating valve is set to the fourth preset load increase opening, for example, 5%. This 5% opening change is greater than the first-stage 3%, aiming to provide a stronger auxiliary load increase effect to cope with more severe frequency drops. It should also be noted that because the primary superheater desuperheating water regulating valve has a coarse adjustment and the secondary superheater desuperheating water regulating valve has a fine adjustment, the aforementioned second preset load increase opening is smaller than the first preset load increase opening, and the fourth preset load increase opening is smaller than the third preset load increase opening.

[0089] This tiered control strategy embodies a refined control concept based on demand: by setting two different speed thresholds (2997.8 rpm and 2997.5 rpm), the frequency reduction condition is subdivided into "normal" and "severe" situations, each corresponding to a different opening amount of the desuperheating water valve. This ensures effective assistance during small frequency fluctuations and provides stronger support during significant frequency drops, achieving a precise match between the adjustment intensity and actual demand, thereby improving the effectiveness and economy of frequency regulation.

[0090] In another embodiment of this application, the opening degree of rapid closing in step S1022 is set in stages according to the degree to which the rotational speed exceeds the frequency upscaling action threshold. Specifically, as follows: Figure 5 As shown, it may further include:

[0091] Step S501: When the rotational speed is higher than the first frequency increase threshold but lower than the second frequency increase threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the first preset load reduction opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the second preset load reduction opening.

[0092] This situation corresponds to a slight increase in grid frequency, where the unit speed just exceeds the threshold for response, but the deviation is not serious.

[0093] The first frequency ramp threshold here can be, for example, 3002.2 rpm, and the second frequency ramp threshold can be, for example, 3002.5 rpm. When the unit speed enters the range of 3002.2 rpm to 3002.5 rpm, and provided that the steam temperature deviation is within the safety threshold, the system determines that a first-level load reduction response is required. At this time, the control system generates a command to close the first-level superheater desuperheating water regulating valve and the second-level superheater desuperheating water regulating valve. The opening change of the first-level superheater desuperheating water regulating valve is set to the first preset load reduction opening, for example, -5%, and the opening change of the second-level superheater desuperheating water regulating valve is set to the second preset load reduction opening, for example, -3%. This is a relatively mild adjustment action, indicating that the valves are closed by 5% and 3% from their current positions.

[0094] Step S502: When the rotational speed is higher than the second frequency increase threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the third preset load reduction opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the fourth preset load reduction opening. The absolute value of the third preset load reduction opening is greater than the absolute value of the first preset load reduction opening, and the absolute value of the fourth preset load reduction opening is greater than the absolute value of the second preset load reduction opening.

[0095] This situation corresponds to a significant increase in grid frequency, where the unit speed has exceeded a higher threshold, indicating that a stronger regulatory response is required.

[0096] When the unit speed exceeds the second frequency increase threshold, such as 3002.5 rpm, the system determines that a secondary load reduction response is required. At this time, the control system generates a larger valve closing command. The opening change of the primary superheater desuperheating water regulating valve is set to the third preset load reduction opening, such as -8%, where the absolute value of -8% is greater than the absolute value of -5% in the first stage (5%). The opening change of the secondary superheater desuperheating water regulating valve is set to the fourth preset load reduction opening, such as -5%, where the absolute value of -5% is greater than the absolute value of -3% in the first stage (3%). This indicates a larger valve closure, designed to provide a stronger auxiliary load reduction effect by significantly reducing the spray volume to cope with a more severe frequency increase.

[0097] This tiered control strategy corresponds to the logic of load increase and also embodies the principle of "responding on demand." By setting two different speed thresholds (3002.2 rpm and 3002.5 rpm), it subdivides the frequency increase operation into "normal" and "severe" conditions, each corresponding to a different closing amount of the desuperheating water valve. This refined control ensures effective assistance when the frequency increases slightly and provides stronger support when the frequency increases significantly, thus achieving a precise match between the regulation intensity and the actual needs of the power grid.

[0098] In another embodiment of this application, step S103 above, which involves directly superimposing the adjustment command onto the original control command of the desuperheating water regulating valve for output, includes: superimposing the adjustment command onto the manual / automatic operation station after the original PID controller, and directly acting on the final execution command of the desuperheating water regulating valve.

[0099] In a conventional DCS control loop, for a regulating valve (such as the desuperheating water regulating valve in this application), its control signal typically passes through a PID (proportional-integral-derivative) controller and is then output to a manual / automatic operator station. The operator can switch between automatic and manual control modes of the valve through this station. The auxiliary frequency modulation pulse command generated in this application bypasses the conventional control loop. Specifically, the superposition point of this regulation command is located after the PID controller and the manual / automatic operator station; it is directly added to the command output from the manual operator station to form the final execution command sent to the valve positioner or actuator.

[0100] Therefore, regardless of whether the original PID control system is in automatic or manual mode, and regardless of its output command, this auxiliary frequency modulation command can be forcibly and indiscriminately superimposed on the final output, ensuring that the primary frequency modulation response is executed with the highest priority and most reliable performance. This design does not modify the original PID controller parameters or the internal logic of the M / A manual station; it simply performs an addition operation at the final output. When the auxiliary frequency modulation action is not triggered, the superimposed value is zero, having no impact on the original system and ensuring the integrity and stability of the control system.

[0101] Because it acts directly on the final command, it can bypass various rate limits or filters that may exist in the original control loop, thereby achieving fast on or off without rate limits and meeting the stringent requirements of primary frequency modulation for speed.

[0102] In another embodiment of this application, the preset recovery rate in step S104 is less than or equal to 10% / min, so as to reduce system disturbance during the recovery process of the boiler desuperheating water regulating valve.

[0103] In this embodiment, achieving the preset target refers to the end of the duration of the auxiliary frequency modulation pulse command, such as 10 seconds. Once this 10-second forced action (quick opening or quick closing) ends, the recovery phase begins. To avoid secondary shocks and disturbances to boiler parameters such as steam temperature and pressure caused by sudden and significant valve retraction, this application specifically sets a relatively slow recovery rate. This preset recovery rate is less than or equal to 10% / min. This means that the valve will slowly move back to its position before the auxiliary action at a rate not exceeding 10% of its total stroke per minute.

[0104] It is evident that the core design principle of this application is fast-acting and slow-returning. Fast-acting refers to the valve opening or closing rapidly without rate limit when a frequency regulation response is required, in order to provide effective power support in the shortest possible time. Slow-returning refers to a slow and smooth recovery process after the completion of a brief auxiliary task, allowing the conventional PID control system sufficient time to take over and stabilize changes caused by the auxiliary action (such as steam temperature fluctuations), thereby reducing disturbances in the regulation process and ensuring the safe and stable operation of the unit.

[0105] Therefore, setting a slow recovery rate of no more than 10% / min in this application is one of the key measures to ensure the practicality and safety of this auxiliary frequency regulation technology. While achieving rapid frequency regulation response, it also takes into account the inertia and stability of the boiler system, effectively avoiding system oscillations or overshoot caused by the rapid withdrawal of auxiliary regulation, reflecting a comprehensive consideration of the overall unit's coordinated control stability.

[0106] In another embodiment of this application, the above method further includes: modifying or adjusting the action threshold, the graded opening degree, the safety threshold and the recovery rate online according to the actual operating characteristics of the unit.

[0107] The action thresholds include a first and a second frequency reduction threshold that trigger action when the frequency is reduced, and a first and a second frequency increase threshold that trigger action when the frequency is increased. These can all be adjusted according to the unit's frequency regulation response capability under different operating conditions.

[0108] The graded opening degree refers to the amplitude of the action of the desuperheating water regulating valve within different threshold ranges, such as 3%, 5%, 8% (load increase) and -3%, -5%, -8% (load decrease), etc. These can be optimized according to the valve characteristics and the actual effect of the boiler response.

[0109] The safety threshold refers to the range of steam temperature deviation that needs to be assessed before triggering auxiliary frequency regulation; it is the steam temperature safety threshold. This value is directly related to the safety of the control strategy and needs to be precisely tuned based on the boiler's specific tolerance and operating procedures.

[0110] The recovery rate refers to the speed at which the valve returns to its initial position after the auxiliary action is completed. This rate can also be adjusted according to the degree of system disturbance during actual operation to achieve the best smooth transition effect.

[0111] This online modifiable and adjustable design allows the control method to better adapt to different types, capacities, and operating conditions of thermal power units, making it highly practical and worthy of widespread application. Technicians can easily optimize these parameters within the DCS system, thereby finding the best auxiliary frequency regulation effect while ensuring safety.

[0112] The above-mentioned control method using boiler desuperheating water to assist primary frequency regulation can also be found in [reference needed]. Figure 6 and Figure 7 ,in Figure 6 This is a schematic diagram of the auxiliary primary frequency regulation control method for the desuperheating water of the boiler's first-stage superheater. Figure 7 This is a schematic diagram of the auxiliary primary frequency regulation control method for the desuperheating water of the boiler's secondary superheater.

[0113] Figure 6 and Figure 7 They can all be divided into three main parts:

[0114] Conventional control loop (right side): This is the standard PID control loop for a boiler desuperheating water system. The "steam temperature controlled variable" (process variable PV) and the "steam temperature setpoint" (setpoint SP) are fed into the PID controller. The command calculated by the PID controller passes through an "M / A station" (manual / automatic operator station). The output of the M / A station is the command for controlling the desuperheating water regulating valve under normal conditions.

[0115] Auxiliary frequency modulation logic (within the dashed box on the left): This is the core part of the invention, which generates a pulse command to assist primary frequency modulation. This logic is divided into two branches, corresponding to the two operating conditions of frequency reduction (load increase) and frequency increase (load reduction), respectively.

[0116] Upper branch: Frequency reduction (load increase) logic. The trigger condition is that when the "unit speed" is lower than 2997.8 rpm and the deviation between the "steam temperature setpoint" and the "steam temperature controlled value" is less than the steam temperature safety threshold, these two conditions are simultaneously satisfied through an AND gate logic. After the conditions are met, a pulse signal lasting 10 seconds will be triggered.

[0117] For the desuperheating water in the first-stage superheater, if the unit speed is below the lower threshold of 2997.5 rpm, an opening change command of +8% is output. If the speed is above 2997.5 rpm (but still below 2997.8 rpm), an opening change command of +5% is output.

[0118] For the desuperheating water in the secondary superheater, if the unit speed is below the lower threshold of 2997.5 rpm, a +5% opening change command is output. If the speed is above 2997.5 rpm (but still below 2997.8 rpm), a +3% opening change command is output.

[0119] The lower branch: frequency increase (load decrease) logic. The trigger condition is that when the "unit speed" is higher than 3002.2 rpm and the deviation between the "steam temperature setpoint" and the "steam temperature controlled value" is less than the steam temperature safety threshold, these two conditions are simultaneously satisfied through an AND logic check. After the conditions are met, a pulse signal lasting 10 seconds is also triggered.

[0120] For the desuperheating water in the first-stage superheater, if the unit speed is higher than the higher threshold of 3002.5 rpm, an opening change command of -8% is output. If the speed is lower than 3002.5 rpm (but still higher than 3002.2 rpm), an opening change command of -5% is output.

[0121] For the desuperheating water in the secondary superheater, if the unit speed is higher than the higher threshold of 3002.5 rpm, a -5% opening change command is output. If the speed is lower than 3002.5 rpm (but still higher than 3002.2 rpm), a -3% opening change command is output.

[0122] The commands from the auxiliary frequency modulation logic and the commands from the M / A station in the conventional control loop are superimposed using an adder. The superimposed signal forms the final command for the desuperheating water regulating valve, which is sent directly to the valve actuator.

[0123] like Figure 8 The diagram shown is a schematic representation of a control device for primary frequency regulation using boiler desuperheating water staged auxiliary frequency regulation, according to an embodiment of this application. The device includes: a real-time monitoring unit 810, a regulation command generation unit 820, a command superposition unit 830, and a recovery unit 840, which are connected sequentially.

[0124] The real-time monitoring unit 810 is used to acquire and monitor the generator set speed and boiler steam temperature in real time.

[0125] The adjustment command generation unit 820 is used to generate an adjustment command for graded pulse-type adjustment of the boiler desuperheating water regulating valve according to the degree of deviation of the speed from the threshold when the speed is detected to exceed the preset action threshold and the deviation of the steam temperature from the set value is within the safety threshold range, so as to assist the unit in performing primary frequency regulation.

[0126] The instruction superposition unit 830 is used to directly superimpose the adjustment instruction onto the original control instruction of the desuperheating water regulating valve for output and execution.

[0127] The recovery unit 840 is used to control the boiler desuperheating water regulating valve to smoothly return to the position before the auxiliary action at a preset recovery rate after the frequency adjustment reaches the preset target.

[0128] In one embodiment of this application, the adjustment instruction generation unit 820 includes:

[0129] The load increase adjustment module is used to generate a load increase adjustment command that causes the desuperheating water regulating valve to open rapidly without rate limit when the rotation speed is lower than the preset frequency reduction action threshold.

[0130] The load reduction adjustment module is used to generate a load reduction adjustment command that causes the desuperheating water regulating valve to close quickly in a rate-unrestricted manner when the rotational speed is higher than the preset frequency increase action threshold.

[0131] In one embodiment of this application, the opening degree of the load increase adjustment module is set in stages according to the degree to which the rotational speed is lower than the frequency reduction action threshold, and the opening degree of the load reduction adjustment module is set in stages according to the degree to which the rotational speed is higher than the frequency increase action threshold.

[0132] In one embodiment of this application, the opening degree of the aforementioned load increase adjustment module is set in stages according to the degree to which the rotational speed is lower than the frequency reduction action threshold, including:

[0133] When the rotational speed is lower than the first frequency reduction threshold but higher than the second frequency reduction threshold, the opening change of the desuperheating water regulating valve is set to the first preset load increase opening.

[0134] When the rotational speed is lower than the second frequency reduction threshold, the opening change of the desuperheating water regulating valve is set to the second preset load increase opening, and the second preset load increase opening is greater than the first preset load increase opening.

[0135] In one embodiment of this application, the opening degree of the rapid shutdown of the aforementioned load reduction adjustment module is set in stages according to the degree to which the rotational speed exceeds the frequency increase action threshold, including:

[0136] When the rotational speed is higher than the first frequency increase threshold but lower than the second frequency increase threshold, the opening change of the desuperheating water regulating valve is set to the first preset load reduction opening.

[0137] When the rotational speed is higher than the second frequency increase threshold, the opening change of the desuperheating water regulating valve is set to the second preset load reduction opening, and the absolute value of the second preset load reduction opening is greater than the absolute value of the first preset load reduction opening.

[0138] In one embodiment of this application, the instruction overlay unit 830 is specifically used for:

[0139] The adjustment command is superimposed on the manual / automatic operation station after the original PID controller, and directly acts on the final execution command of the desuperheating water regulating valve.

[0140] In one embodiment of this application, the preset recovery rate is less than or equal to 10% / min, so as to reduce system disturbances during the recovery process of the boiler desuperheating water regulating valve.

[0141] In one embodiment of this application, the above-mentioned device further includes: a modification and setting unit, used to modify or set the action threshold, the graded opening degree, the safety threshold and the recovery rate online according to the actual operating characteristics of the unit.

[0142] As described above, the control device proposed in this application, which utilizes boiler desuperheating water to assist primary frequency regulation in a tiered manner, can directly and effectively assist the unit in primary frequency regulation through the rapid, tiered action of the boiler desuperheating water regulating valve. This directly improves the regulation quality, thereby enhancing the primary frequency regulation performance of the thermal power unit and increasing its profitability. Furthermore, while improving frequency regulation performance, this application fully considers system safety. By setting a safe steam temperature threshold, it ensures that the auxiliary actions will not cause significant steam temperature fluctuations that could threaten unit safety. Simultaneously, after the regulating valve action, a fast-acting, slow-return recovery method is adopted, restoring smoothly at a relatively slow rate, reducing disturbances to the system and ensuring the safety and stability of the desuperheating water regulation process. The solution proposed in this application can be directly implemented in the existing DCS by modifying the control logic configuration, without adding new hardware. This approach minimizes the workload of modification, simplifies implementation, and has strong practicality and promotional value.

[0143] Figure 9 This is a schematic diagram of the electronic device provided in the embodiments of this application. Figure 9 The illustrated electronic device is a general-purpose data processing apparatus, comprising a general-purpose computer hardware structure, including at least a processor 801 and a memory 802. The processor 801 and memory 802 are connected via a bus 803. The memory 802 is adapted to store one or more instructions or programs executable by the processor 801. These instructions or programs are executed by the processor 801 to implement the steps in the aforementioned control method utilizing boiler desuperheating water tiered to assist primary frequency regulation.

[0144] The processor 801 described above can be a standalone microprocessor or a collection of one or more microprocessors. Thus, the processor 801 executes commands stored in the memory 802, thereby performing the method flow described in the embodiments of this application to process data and control other devices. The bus 803 connects the aforementioned components together, and also connects these components to the display controller 804, the display device, and the input / output (I / O) device 805. The input / output (I / O) device 805 can be a mouse, keyboard, modem, network interface, touch input device, motion-sensing input device, printer, and other devices known in the art. Typically, the input / output (I / O) device 805 is connected to the system via an input / output (I / O) controller 806.

[0145] The memory 802 can store software components, such as an operating system, a communication module, an interaction module, and application programs. Each of the modules and application programs described above corresponds to a set of executable program instructions that perform one or more functions and the methods described in the embodiments of the invention.

[0146] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method described above for using boiler desuperheating water to assist primary frequency regulation.

[0147] The control method and device proposed in this application, which utilizes boiler desuperheating water to assist primary frequency regulation in a staged manner, can directly and effectively assist the unit in primary frequency regulation through the rapid, staged action of the boiler desuperheating water regulating valve. This directly improves the regulation quality, thereby enhancing the primary frequency regulation performance of the thermal power unit and increasing its profitability. Furthermore, while improving frequency regulation performance, this application fully considers system safety. By setting a safe steam temperature threshold, it ensures that the auxiliary action will not cause significant steam temperature fluctuations that could threaten unit safety. Simultaneously, after the regulating valve action, a fast-acting, slow-return recovery method is adopted, restoring smoothly at a relatively slow rate, reducing disturbances to the system and ensuring the safety and stability of the desuperheating water regulation process. The solution proposed in this application can be directly implemented in the existing DCS by modifying the control logic configuration, without adding new hardware. This approach minimizes the workload of modification, simplifies implementation, and has strong practicality and promotional value.

[0148] Preferred embodiments of this application have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are apparent from this detailed description, and therefore the claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of this application are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.

[0149] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0150] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0151] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0152] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0153] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A control method for primary frequency regulation using staged desuperheating water in a boiler, characterized in that, The method includes: Real-time acquisition and monitoring of generator set speed and boiler steam temperature; When the rotational speed is detected to exceed the preset action threshold, and the deviation of the steam temperature from the set value is within the safety threshold range, a regulation command is generated to perform graded pulse-type regulation on the boiler's primary superheater desuperheating water regulating valve and the secondary superheater desuperheating water regulating valve, based on the degree of deviation of the rotational speed from the threshold, in order to assist the unit in performing primary frequency regulation. The adjustment command is directly superimposed onto the original control command of the desuperheating water regulating valve for output and execution; After the frequency adjustment reaches the preset target, the boiler desuperheating water regulating valve is controlled to smoothly return to the position before the auxiliary action at a preset recovery rate.

2. The control method for primary frequency regulation using boiler desuperheating water staged assistance as described in claim 1, characterized in that, The generation of regulation commands for graded pulse-type regulation of the boiler's primary superheater desuperheating water regulating valve and secondary superheater desuperheating water regulating valve specifically includes: When the rotational speed is lower than the preset frequency reduction action threshold, a load increase regulation command is generated to rapidly open the primary superheater desuperheating water regulating valve and the secondary superheater desuperheating water regulating valve in a rate-unrestricted manner. When the rotational speed is higher than the preset frequency increase threshold, a load reduction regulation command is generated to quickly close the desuperheating water regulating valve of the first-stage superheater and the desuperheating water regulating valve of the second-stage superheater in a rate-unrestricted manner.

3. The control method for primary frequency regulation using boiler desuperheating water staged assistance as described in claim 2, characterized in that, The opening degree of the rapid opening is set in stages according to the degree to which the rotational speed is lower than the frequency reduction action threshold, and the opening degree of the rapid closing is set in stages according to the degree to which the rotational speed is higher than the frequency increase action threshold.

4. The control method for primary frequency regulation using boiler desuperheating water staged assistance as described in claim 3, characterized in that, The opening degree of the rapid opening is set in stages according to the degree to which the rotational speed is lower than the frequency reduction action threshold, including: When the rotational speed is lower than the first frequency reduction threshold but higher than the second frequency reduction threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the first preset load increase opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the second preset load increase opening. When the rotational speed is lower than the second frequency reduction threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the third preset load increase opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the fourth preset load increase opening. The third preset load increase opening is greater than the first preset load increase opening, and the fourth preset load increase opening is greater than the second preset load increase opening.

5. The control method for primary frequency regulation using boiler desuperheating water staged assistance as described in claim 3, characterized in that, The opening degree of the rapid closing is set in stages according to the degree to which the rotational speed exceeds the frequency boosting threshold, including: When the rotational speed is higher than the first frequency increase threshold but lower than the second frequency increase threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the first preset load reduction opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the second preset load reduction opening. When the rotational speed is higher than the second frequency increase threshold, the opening change of the first-stage superheater desuperheating water regulating valve is set to the third preset load reduction opening, and the opening change of the second-stage superheater desuperheating water regulating valve is set to the fourth preset load reduction opening. The absolute value of the third preset load reduction opening is greater than the absolute value of the first preset load reduction opening, and the absolute value of the fourth preset load reduction opening is greater than the absolute value of the second preset load reduction opening.

6. The control method for primary frequency regulation using boiler desuperheating water staged assistance as described in claim 1, characterized in that, The step of directly superimposing the adjustment command onto the original control command of the desuperheating water regulating valve for output includes: The adjustment command is superimposed on the manual / automatic operation station after the original PID controller, and directly acts on the final execution command of the desuperheating water regulating valve.

7. The control method for primary frequency regulation using boiler desuperheating water staged assistance as described in claim 1, characterized in that, The preset recovery rate is less than or equal to 10% / min, in order to reduce system disturbances during the recovery process of the boiler desuperheating water regulating valve.

8. The control method for primary frequency regulation using boiler desuperheating water staged assistance as described in claim 3, characterized in that, The method further includes: modifying or adjusting the action threshold, the graded opening degree, the safety threshold, and the recovery rate online according to the actual operating characteristics of the unit.

9. A control device for primary frequency regulation using boiler desuperheating water staged auxiliary frequency regulation, characterized in that, The device includes: The real-time monitoring unit is used to acquire and monitor the generator set speed and boiler steam temperature in real time. The adjustment command generation unit is used to generate adjustment commands for graded pulse-type adjustment of the boiler's primary superheater desuperheating water regulating valve and secondary superheater desuperheating water regulating valve according to the degree of deviation of the speed from the threshold when the detected speed exceeds the preset action threshold and the deviation of the steam temperature from the set value is within the safety threshold range, so as to assist the unit in performing primary frequency regulation. The instruction superposition unit is used to directly superimpose the adjustment instruction onto the original control instruction of the desuperheating water regulating valve for output and execution. The recovery unit is used to control the boiler desuperheating water regulating valve to smoothly return to the position before the auxiliary action at a preset recovery rate after the frequency adjustment reaches the preset target.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 8.

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