A main steam temperature intelligent control method for a heat supply unit in a thermal fixation electric mode

Abstract

The application discloses a kind of main steam temperature intelligent control method of heat supply unit in thermal mode, comprising: the heat load value of real-time acquisition heat supply unit, unit working load value and main steam temperature actual detection value;According to heat load value and the unit working load value, utilize the preset heat load-main steam temperature model, fit the main steam temperature fluctuation value of heat supply unit;According to main steam temperature fluctuation value and preset main steam temperature theoretical set value, determine the main steam temperature actual set value of unit;According to main steam temperature actual detection value and main steam temperature actual set value, utilize the preset main steam temperature-regulating valve opening degree model, determine the opening degree control quantity of desuperheating water regulating valve.The method of the application not only guarantees the adjustment range of main steam temperature when heat load changes, but also overcomes the follow-up of main steam temperature when heat load changes and the control difficulty of main steam temperature control itself large hysteresis large inertia, improves the stability of main steam temperature when heat load changes.

Description

Technical Field

[0001] This invention belongs to the technical field of thermal power heating units, specifically relating to a method, device, system, electronic equipment, and computer-readable storage medium for intelligent control of main steam temperature in a heating unit operating under a heat-to-electricity mode. Background Technology

[0002] Thermal power generating units generally operate in two modes: electricity-driven heating and heat-driven electricity. In electricity-driven heating mode, the unit prioritizes electrical load demand, with the heat load fluctuating accordingly, and the overall control system is in an active control state. In heat-driven electricity mode, the unit prioritizes heat load demand, with the electrical load varying with the heat load. During actual heat load scheduling, the unit's electrical load is merely a byproduct of heating, and the overall control system is in a follow-up control state, with main steam temperature control only able to be passively adjusted. When external user steam consumption changes drastically, the unit's heat load fluctuates significantly, and the main steam temperature fluctuates violently due to changes in the unit's steam flow. The control system only begins to adjust after receiving the change in main steam temperature, but due to the inherent large lag and inertia of main steam temperature regulation, its performance is often poor, failing to maintain the main steam temperature within a safe and economical fluctuation range.

[0003] Currently, to address the challenge of automatic control of main steam temperature fluctuations caused by changes in heat users under a heat-to-power system, the unit's main steam temperature control system primarily employs a cascaded PID (Proportional-Integral-Derivative) superimposed feedforward control strategy. Specifically: the main loop calculates the steam temperature demand after desuperheater regulation by processing the deviation between the main steam temperature setpoint and the actual main steam temperature using PID calculations; the secondary loop generates the desuperheater regulation steam temperature setpoint by superimposing the main loop output value (the steam temperature demand after desuperheater regulation) with the feedforward value. The deviation between this setpoint and the actual steam temperature after desuperheater regulation is then calculated using PID calculations to generate a desuperheater regulating valve command, controlling the valve opening to adjust the desuperheating water flow. The feedforward value is formed as a function of the boiler's total load (represented by main steam flow) corresponding to the steam temperature after desuperheater regulation, thus overcoming the steam temperature impact caused by changes in heat load. The above control strategy, because its feedforward value for heat load changes is only generated by a static function and does not have any advance adjustment means, and the biggest problem of main steam temperature control itself is that it has large lag and large inertia characteristics, so the main steam temperature regulation effect is not ideal when the heat load changes greatly, and in severe cases, manual intervention by operators is required.

[0004] Therefore, it is necessary to propose an intelligent control method for the main steam temperature of heating units operating under the heat-driven power mode. This method aims to address the problem that, under the heat-driven power mode, existing heating units exhibit significant lag and inertia in their main steam temperature regulation strategy when the heat load changes considerably. This results in large fluctuations and poor stability of the main steam temperature, making it impossible to maintain the main steam temperature within a safe and economical range. Summary of the Invention

[0005] This invention provides an intelligent control method for the main steam temperature of a heating unit operating under a heat-driven power supply mode. This method addresses the technical problems of unsatisfactory main steam temperature regulation in existing heating units operating under a heat-driven power supply mode when the heat load changes significantly, resulting in large fluctuations and instability in the main steam temperature.

[0006] The present invention provides a method for intelligent control of main steam temperature of a heating unit in a heat-to-electricity mode, comprising:

[0007] Real-time acquisition of the heat load value, unit working load value and actual detected value of main steam temperature of the heating unit;

[0008] Based on the heat load value and the unit working load value, the main steam temperature fluctuation value of the heating unit is fitted using a preset heat load-main steam temperature model.

[0009] The actual set value of the main steam temperature of the unit is determined based on the main steam temperature fluctuation value and the preset theoretical set value of the main steam temperature.

[0010] Based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, the opening control quantity of the desuperheating water regulating valve is determined using a preset main steam temperature-regulating valve opening model.

[0011] Furthermore, the preset heat load-main steam temperature model is used to determine the characteristic value of main steam temperature change corresponding to heat load changes when the heating unit is under different working loads, with the opening of the desuperheating water regulating valve remaining unchanged.

[0012] Based on the heat load value and the unit load value, the main steam temperature fluctuation value of the heating unit is fitted using a preset heat load-main steam temperature model, including:

[0013] The characteristic value of the main steam temperature change of the heating unit under the conditions of the unit's working load value and the heat load value is determined by using a preset heat load-main steam temperature model.

[0014] The main steam temperature fluctuation value of the heating unit is fitted according to the main steam temperature change characteristic value.

[0015] Furthermore, the main steam temperature change characteristic values ​​of the heating unit include: main steam temperature gain, main steam temperature dead zone time, and main steam temperature transition process time;

[0016] The main steam temperature gain is used to reflect the magnitude of the main steam temperature change; the main steam temperature dead zone time is used to reflect the time when the main steam temperature begins to change; and the main steam temperature transition time is used to reflect the time when the main steam temperature change is at its maximum.

[0017] Furthermore, the preset main steam temperature-regulating valve opening model is used to determine the main steam temperature change characteristic value corresponding to different opening control quantities of the desuperheating water regulating valve when the heat load of the heating unit remains unchanged.

[0018] Based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, the opening control quantity of the desuperheating water regulating valve is determined using a preset main steam temperature-regulating valve opening model, including:

[0019] Based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, determine the main steam temperature change adjustment requirement value;

[0020] Using a preset main steam temperature-regulating valve opening model, the opening control quantity of the desuperheating water regulating valve corresponding to the main steam temperature change regulation demand value is determined.

[0021] Furthermore, the actual detected value of the main steam temperature is determined by a preset screening method, which screens out the actual measured values ​​of multiple preset measuring points of the heating unit.

[0022] Furthermore, the preset theoretical value of the main steam temperature is determined according to the model of the heating unit.

[0023] The present invention also provides an intelligent control device for the main steam temperature of a heating unit operating in a constant-power mode, comprising:

[0024] The data acquisition module is used to acquire the heat load value, unit working load value and main steam temperature actual detection value of the heating unit in real time;

[0025] The fluctuation determination module is used to fit the main steam temperature fluctuation value of the heating unit based on the heat load value and the unit working load value, using a preset heat load-main steam temperature model.

[0026] The actual value setting module is used to determine the actual set value of the main steam temperature of the unit based on the main steam temperature fluctuation value and the preset theoretical set value of the main steam temperature;

[0027] The control output module is used to determine the opening control quantity of the desuperheating water regulating valve based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, using a preset main steam temperature-regulating valve opening model.

[0028] The present invention also provides a heating regulation and control system, including a heating unit, a main steam temperature control module and a desuperheating water regulating valve, wherein the main steam temperature control module adopts the intelligent main steam temperature control device of the heating unit in the heat-driven power mode described in the above technical solution.

[0029] The main steam temperature control module is connected to the heating unit and the desuperheating water regulating valve, respectively.

[0030] The main steam temperature control module is used to acquire the heat load value, unit working load value and actual main steam temperature value of the heating unit in real time, determine the opening control amount of the desuperheating water regulating valve based on the heat load value, unit working load value and actual main steam temperature value of the heating unit, and adjust the opening of the desuperheating water regulating valve according to the opening control amount of the desuperheating water regulating valve.

[0031] The present invention also provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the intelligent control method for main steam temperature of a heating unit under the heat-driven power supply mode described in any of the above technical solutions.

[0032] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the main steam temperature intelligent control method of the heating unit under the heat-driven power supply mode described in any of the above technical solutions is implemented.

[0033] Compared with the prior art, the beneficial effects of the present invention include: the intelligent control method for main steam temperature of heating units under the heat-driven power mode provided by the present invention firstly acquires the heat load value, unit working load value, and actual detected value of main steam temperature of the heating unit in real time; secondly, it uses the heat load-main steam temperature model to fit and predict the main steam temperature fluctuation value; thirdly, it superimposes the theoretical set value of main steam temperature with the main steam temperature fluctuation value to obtain the actual set value of main steam temperature; and finally, it determines the opening control quantity of the desuperheating water regulating valve through the preset main steam temperature-regulating valve opening model. The method of this invention intelligently predicts the main steam temperature fluctuation value through a heat load-main steam temperature model, uses the main steam temperature fluctuation value to correct the main steam temperature setpoint and participate in automatic adjustment. This not only ensures the adjustment range of the main steam temperature when the heat load changes, but also achieves anticipation in the time domain of heat load / main steam temperature changes. It maximizes the advantages of model prediction, overcomes the difficulties of main steam temperature follow-up when the heat load changes and the large lag and inertia of main steam temperature control itself, improves the stability of main steam temperature when the heat load changes, and solves the problem of large main steam temperature fluctuation and poor stability caused by changes in heat users under the heat-to-electricity method. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating an embodiment of an intelligent control method for main steam temperature of a heating unit in a heat-powered mode provided by the present invention.

[0035] Figure 2 This is a schematic diagram of an embodiment of an intelligent main steam temperature control device for a heating unit operating in a heat-to-electricity mode, provided by the present invention.

[0036] Figure 3 This is a schematic diagram of an embodiment of a heating regulation and control system provided by the present invention;

[0037] Figure 4 This is a schematic diagram of another embodiment of a heating regulation and control system provided by the present invention;

[0038] Figure 5 This is a schematic diagram of an embodiment of an electronic device provided by the present invention. Detailed Implementation

[0039] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0040] Before describing the embodiments, the inventive concept of this application will be explained first.

[0041] In actual heat load scheduling, when thermal power heating units operate in a heat-driven, power-constrained mode, the main steam temperature often fluctuates rapidly and significantly when the steam consumption of heat load users changes drastically. At the same time, it is also affected by the large lag and large inertia regulation characteristics of the main steam temperature regulation system itself, resulting in poor performance of the main steam temperature regulation and an inability to maintain the main steam temperature within a safe and economical fluctuation range. Under this environment, the main steam temperature control strategy of thermal power heating units needs to be designed specifically to significantly improve regulation performance and overcome the impact of large changes in heat load on the main steam temperature control.

[0042] Currently, the main automatic control strategy for main steam temperature fluctuations caused by changes in heat users under a heat-to-electricity system primarily employs a cascaded PID (Proportional-Integral-Derivative) superimposed feedforward control strategy. The main loop calculates the steam temperature demand value by processing the deviation between the main steam temperature setpoint and the actual main steam temperature using PID control. The secondary loop generates the steam temperature setpoint by superimposing the feedforward value (a function of the steam temperature value after the desuperheater adjusts the water spray) onto the steam temperature demand value. This setpoint, along with the deviation from the actual desuperheater-adjusted steam temperature, is then processed by PID control to generate a desuperheater regulating valve command, thereby controlling the valve opening to adjust the desuperheating water flow. However, this control strategy suffers from several drawbacks. Since the feedforward value is generated only by a static function and lacks any proactive adjustment mechanisms, and the main steam temperature regulation system itself exhibits significant lag and inertia, this strategy is unsuitable for main steam temperature regulation under conditions of large heat load variations. It suffers from large main steam temperature fluctuations and poor stability, failing to maintain the main steam temperature within a safe and economical fluctuation range.

[0043] This invention optimizes the traditional cascade PID control into a main steam temperature-desuperheating water regulating valve opening model, enabling predictive control of the main steam temperature. The static feedforward value is optimized into an intelligent predictive feedforward value superimposed with real-time main steam temperature fluctuations. Based on this intelligent predictive feedforward value, the main steam temperature setpoint is corrected and participates in automatic adjustment, controlling the desuperheating regulating valve opening. This ensures the adjustment range of the main steam temperature under varying heat loads while achieving anticipation in the time domain of heat load / main steam temperature changes. It overcomes the challenges of responsive main steam temperature control under varying heat loads and the inherent large lag and inertia of main steam temperature control, thus improving the stability of the main steam temperature under varying heat loads.

[0044] This invention provides a method for intelligent control of main steam temperature in a heating unit operating under a constant-power-temperature mode, such as... Figure 1 As shown, the method includes:

[0045] Step S101: Real-time acquisition of the heat load value, unit working load value, and actual detected value of main steam temperature of the heating unit;

[0046] Step S102: Based on the heat load value and the unit working load value, use a preset heat load-main steam temperature model to fit the main steam temperature fluctuation value of the heating unit;

[0047] Step S103: Determine the actual set value of the main steam temperature of the unit based on the main steam temperature fluctuation value and the preset theoretical set value of the main steam temperature;

[0048] Step S104: Based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, determine the opening control amount of the desuperheating water regulating valve using a preset main steam temperature-regulating valve opening model.

[0049] This embodiment provides an intelligent control method for the main steam temperature of a heating unit in a heat-power-constant mode. First, the heat load value, unit working load value, and actual detected value of the main steam temperature of the heating unit are acquired in real time. Second, the main steam temperature fluctuation value is fitted and predicted using a heat load-main steam temperature model. Third, the theoretical setpoint of the main steam temperature is superimposed with the main steam temperature fluctuation value to obtain the actual setpoint of the main steam temperature. Finally, the opening control quantity of the desuperheating water regulating valve is determined by a preset main steam temperature-regulating valve opening model. The method in this embodiment intelligently predicts the main steam temperature fluctuation value through a heat load-main steam temperature model, uses the main steam temperature fluctuation value to correct the main steam temperature setpoint and participate in automatic adjustment. This not only ensures the adjustment range of the main steam temperature when the heat load changes, but also achieves anticipation in the time domain of heat load / main steam temperature changes. It maximizes the advantages of model prediction, overcomes the difficulties of main steam temperature follow-up when the heat load changes and the large lag and large inertia control of the main steam temperature control itself, improves the stability of the main steam temperature when the heat load changes, and solves the technical problem of large main steam temperature fluctuation and poor stability caused by changes in heat users under the heat-to-electricity method.

[0050] In a preferred embodiment, in step S101, the actual detected value of the main steam temperature is determined by a preset screening method, which screens out the actual measured values ​​of multiple preset measuring points of the heating unit.

[0051] As a specific embodiment, the preset screening method is the method of selecting two out of three main steam temperature measuring points. Among the three preset main steam temperature measuring points, the data of two measuring points that meet the actual use value are selected to ensure the accuracy and reliability of the data and reduce data errors.

[0052] In a preferred embodiment, the preset theoretical main steam temperature setting is determined based on the model of the heating unit. Typically, the preset theoretical main steam temperature setting is set according to the rated parameters of the equipment.

[0053] In a preferred embodiment, in step S102, the preset heat load-main steam temperature model is used to determine the characteristic value of the main steam temperature change corresponding to the heat load change when the heating unit is under different working loads, with the opening of the desuperheating water regulating valve remaining unchanged.

[0054] Based on the heat load value and the unit load value, the main steam temperature fluctuation value of the heating unit is fitted using a preset heat load-main steam temperature model, including:

[0055] The characteristic value of the main steam temperature change of the heating unit under the conditions of the unit's working load value and the heat load value is determined by using a preset heat load-main steam temperature model.

[0056] The main steam temperature fluctuation value of the heating unit is fitted according to the main steam temperature change characteristic value.

[0057] In a preferred embodiment, the main steam temperature change characteristic values ​​of the heating unit include: main steam temperature gain, main steam temperature dead zone time, and main steam temperature transition process time;

[0058] The main steam temperature gain is used to reflect the magnitude of the main steam temperature change; the main steam temperature dead zone time is used to reflect the time when the main steam temperature begins to change; and the main steam temperature transition time is used to reflect the time when the main steam temperature change is at its maximum.

[0059] Based on the main steam temperature gain, main steam temperature dead zone time, and main steam temperature transition time, the predicted fluctuation value of the main steam temperature can be predicted under different unit operating load conditions when the heat load changes. This allows for the optimization of the theoretical setpoint of the main steam temperature and the generation of the actual setpoint of the main steam temperature. This solves the problem that traditional control strategies only start adjusting after the measured value of the main steam temperature changes, and the main steam temperature has hysteresis and inertia, which affects the main steam temperature regulation performance.

[0060] As a specific implementation example, the method for establishing the preset heat load-main steam temperature model is as follows:

[0061] When the working load (boiler load) of the heating unit is 30%, 50%, and 100% and is stable, the main steam temperature control is switched from automatic to manual mode, and the opening of the desuperheating water regulating valve is kept unchanged. The heat load is increased or decreased by 50T / H respectively to make the main steam temperature change until it stabilizes. The main steam temperature gain, main steam temperature dead zone time, and main steam temperature transition process time in the heat load-main steam temperature model are calculated.

[0062] Based on the heat load-main steam temperature model, the main steam temperature fluctuation value under heat load variation is fitted, and the main steam temperature gain, main steam temperature dead zone time, and main steam temperature transition process time in the heat load-main steam temperature model are adjusted until the fitted main steam temperature fluctuation value is similar to the actual main steam temperature fluctuation value under heat load variation.

[0063] In a preferred embodiment, in step S103, the preset main steam temperature-regulating valve opening model is used to determine the main steam temperature change characteristic value corresponding to different opening control quantities of the desuperheating water regulating valve when the heat load of the heating unit remains unchanged.

[0064] Based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, the opening control quantity of the desuperheating water regulating valve is determined using a preset main steam temperature-regulating valve opening model, including:

[0065] Based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, determine the main steam temperature change adjustment requirement value;

[0066] Using a preset main steam temperature-regulating valve opening model, the opening control quantity of the desuperheating water regulating valve corresponding to the main steam temperature change regulation demand value is determined.

[0067] As a specific embodiment, the method for establishing the main steam temperature-regulating valve opening model is as follows:

[0068] When the operating load (boiler load) of the heating unit is 30%, 50%, and 100% and is stable, switch the main steam temperature control from automatic to manual mode while keeping the boiler load constant. Increase or decrease the opening of the desuperheating water regulating valve by 10% to change the main steam temperature until it stabilizes. Calculate the main steam temperature gain, main steam temperature dead zone time, and main steam temperature transition time in the mathematical model of the main steam temperature / desuperheating water regulating valve opening change. Put the main steam temperature model prediction into automatic mode and adjust the main steam temperature gain, main steam temperature dead zone time, and main steam temperature transition time in the model prediction controller until the main steam temperature control performance is stable.

[0069] To verify the effectiveness of the method in this embodiment, the method was practically applied to main steam temperature control under a heat-driven power supply mode. After optimizing the main steam temperature control of the unit under the heat-driven power supply mode, the regulation quality of the main steam temperature during heat load fluctuations was significantly improved, and the deviation between the main steam temperature setpoint and the actual main steam temperature could be basically controlled within ±3℃.

[0070] This embodiment also provides a main steam temperature intelligent control device 200 for a heating unit operating in a heat-to-electricity mode, the structural block diagram of which is shown below. Figure 2 As shown, it includes:

[0071] Data acquisition module 201 is used to acquire the heat load value, unit working load value and main steam temperature actual detection value of the heating unit in real time;

[0072] The fluctuation determination module 202 is used to fit the main steam temperature fluctuation value of the heating unit based on the heat load value and the unit working load value, using a preset heat load-main steam temperature model.

[0073] The actual value setting module 203 is used to determine the actual setting value of the main steam temperature of the unit based on the main steam temperature fluctuation value and the preset theoretical setting value of the main steam temperature;

[0074] The control output module 204 is used to determine the opening control quantity of the desuperheating water regulating valve based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, using a preset main steam temperature-regulating valve opening model.

[0075] like Figure 3 As shown, this embodiment also provides a heating regulation and control system 300, including a heating unit 301, a main steam temperature control module 302 and a desuperheating water regulating valve 303. The main steam temperature control module adopts a main steam temperature intelligent control device for a heating unit in a heat-driven power mode as described in the above technical solution.

[0076] The main steam temperature control module 302 is connected to the heating unit and the desuperheating water regulating valve, respectively.

[0077] The main steam temperature control module is used to acquire the heat load value, unit working load value and actual main steam temperature value of the heating unit in real time, determine the opening control amount of the desuperheating water regulating valve based on the heat load value, unit working load value and actual main steam temperature value of the heating unit, and adjust the opening of the desuperheating water regulating valve according to the opening control amount of the desuperheating water regulating valve.

[0078] As a specific embodiment, to meet the needs of practical applications, the heating unit can still retain the traditional main steam temperature control strategy. In this case, the heating regulation and control system also includes a switching module and the original control module. Figure 4As shown, the actual setpoint and actual detected value of the main steam temperature are input into the switching module. The switching module then selects whether to send the data to the original control module or the main steam temperature control module. The two control strategies can be switched seamlessly in real time. The original control module and the main steam temperature control optimization module (main steam temperature control module) under the heat-driven power mode have rigorous communication handshake, switching protection, and output tracking control strategies to ensure the safety of the system during commissioning and decommissioning.

[0079] like Figure 5 As shown in the above-described intelligent control method for main steam temperature of a heating unit in a heat-to-electricity mode, this invention also provides an electronic device 500, which can be a mobile terminal, desktop computer, laptop, handheld computer, server, or other computing device. The electronic device includes a processor 501, a memory 502, and a display 503.

[0080] In some embodiments, memory 502 may be an internal storage unit of a computer device, such as a hard disk or memory. In other embodiments, memory 502 may be an external storage device of a computer device, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc. Further, memory 502 may include both internal and external storage units of the computer device. Memory 502 is used to store application software and various types of data installed on the computer device, such as program code for installing the computer device. Memory 502 may also be used to temporarily store data that has been output or will be output. In one embodiment, memory 502 stores a program 504 for intelligent control of the main steam temperature of a heating unit in a heat-to-electricity mode. This program 504 can be executed by processor 501 to implement an intelligent control method for the main steam temperature of a heating unit in a heat-to-electricity mode according to various embodiments of the present invention.

[0081] In some embodiments, processor 501 may be a central processing unit (CPU), microprocessor or other data processing chip, used to run program code stored in memory 502 or process data, such as executing a method for intelligent control of main steam temperature of a heating unit in a heat-powered mode.

[0082] In some embodiments, display 503 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 503 is used to display information on the computer device and to display a visual user interface. Components 501-503 of the computer device communicate with each other via a system bus.

[0083] This embodiment also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the intelligent control method for main steam temperature of a heating unit under the heat-driven power supply mode described in any of the above technical solutions.

[0084] The computer-readable storage medium and computing device provided in the above embodiments of the present invention can be implemented with reference to the content specifically described above regarding the intelligent control method of main steam temperature of a heating unit in a heat-power-constant mode, and have similar beneficial effects to the intelligent control method of main steam temperature of a heating unit in a heat-power-constant mode, which will not be repeated here.

[0085] This invention provides an intelligent control method for the main steam temperature of a heating unit in a heat-power-constant mode. First, the heat load value, unit working load value, and actual detected value of the main steam temperature of the heating unit are acquired in real time. Second, the main steam temperature fluctuation value is fitted and predicted using a heat load-main steam temperature model. Third, the theoretical setpoint of the main steam temperature is superimposed with the main steam temperature fluctuation value to obtain the actual setpoint of the main steam temperature. Finally, the opening control quantity of the desuperheating water regulating valve is determined by a preset main steam temperature-regulating valve opening model.

[0086] The method of this invention intelligently predicts the main steam temperature fluctuation value through a heat load-main steam temperature model, uses the main steam temperature fluctuation value to correct the main steam temperature setpoint and participate in automatic adjustment. This not only ensures the adjustment range of the main steam temperature when the heat load changes, but also achieves anticipation in the time domain of heat load / main steam temperature changes. It maximizes the advantages of model prediction, overcomes the difficulties of main steam temperature follow-up when the heat load changes and the large lag and inertia of main steam temperature control itself, improves the stability of main steam temperature when the heat load changes, and solves the problem of large main steam temperature fluctuation and poor stability caused by changes in heat users under the heat-to-electricity method.

[0087] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for intelligent control of main steam temperature in a heating unit operating under a constant-power-temperature mode, characterized in that, include: Real-time acquisition of the heat load value, unit working load value and actual detected value of main steam temperature of the heating unit; Based on the heat load value and the unit working load value, the main steam temperature fluctuation value of the heating unit is fitted using a preset heat load-main steam temperature model. The actual set value of the main steam temperature of the unit is determined based on the main steam temperature fluctuation value and the preset theoretical set value of the main steam temperature. Based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, the opening control quantity of the desuperheating water regulating valve is determined using a preset main steam temperature-regulating valve opening model.

2. The intelligent control method for main steam temperature of a heating unit in a heat-to-electricity mode according to claim 1, characterized in that, The preset heat load-main steam temperature model is used to determine the characteristic value of main steam temperature change corresponding to heat load change when the heating unit is under different working loads, with the opening of the desuperheating water regulating valve remaining unchanged. Based on the heat load value and the unit operating load value, the main steam temperature fluctuation value of the heating unit is fitted using a preset heat load-main steam temperature model, including: The characteristic value of the main steam temperature change of the heating unit under the conditions of the unit's working load value and the heat load value is determined by using a preset heat load-main steam temperature model. The main steam temperature fluctuation value of the heating unit is fitted according to the main steam temperature change characteristic value.

3. The intelligent control method for main steam temperature of a heating unit in a heat-to-electricity mode according to claim 2, characterized in that, The main steam temperature variation characteristic values ​​of the heating unit include: main steam temperature gain, main steam temperature dead zone time, and main steam temperature transition process time. The main steam temperature gain is used to reflect the magnitude of the main steam temperature change; the main steam temperature dead zone time is used to reflect the time when the main steam temperature begins to change; and the main steam temperature transition time is used to reflect the time when the main steam temperature change is at its maximum.

4. The intelligent control method for main steam temperature of a heating unit in a heat-to-electricity mode according to claim 2, characterized in that, The preset main steam temperature-regulating valve opening model is used to determine the main steam temperature change characteristic value corresponding to different opening control quantities of the desuperheating water regulating valve when the heat load of the heating unit remains unchanged. Based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, the opening control quantity of the desuperheating water regulating valve is determined using a preset main steam temperature-regulating valve opening model, including: Based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, determine the main steam temperature change adjustment requirement value; Using a preset main steam temperature-regulating valve opening model, the opening control quantity of the desuperheating water regulating valve corresponding to the main steam temperature change regulation demand value is determined.

5. The intelligent control method for main steam temperature of a heating unit in a heat-to-electricity mode according to claim 1, characterized in that, The actual measured value of the main steam temperature is determined by a preset screening method, which screens out the actual measured values ​​of multiple preset measuring points of the heating unit.

6. The intelligent control method for main steam temperature of a heating unit in a heat-to-electricity mode according to claim 1, characterized in that, The preset theoretical value of the main steam temperature is determined according to the model of the heating unit.

7. A smart control device for the main steam temperature of a heating unit operating in a constant-power-heat mode, characterized in that, include: The data acquisition module is used to acquire the heat load value, unit working load value and main steam temperature actual detection value of the heating unit in real time; The fluctuation determination module is used to fit the main steam temperature fluctuation value of the heating unit based on the heat load value and the unit working load value, using a preset heat load-main steam temperature model. The actual value setting module is used to determine the actual set value of the main steam temperature of the unit based on the main steam temperature fluctuation value and the preset theoretical set value of the main steam temperature; The control output module is used to determine the opening control quantity of the desuperheating water regulating valve based on the actual detected value of the main steam temperature and the actual set value of the main steam temperature, using a preset main steam temperature-regulating valve opening model.

8. A heating regulation and control system, comprising a heating unit, a main steam temperature control module, and a desuperheating water regulating valve, characterized in that, The main steam temperature control module adopts the intelligent main steam temperature control device of the heating unit in the heat-power mode as described in claim 7. The main steam temperature control module is connected to the heating unit and the desuperheating water regulating valve, respectively. The main steam temperature control module is used to acquire the heat load value, unit working load value and actual main steam temperature value of the heating unit in real time, determine the opening control amount of the desuperheating water regulating valve based on the heat load value, unit working load value and actual main steam temperature value of the heating unit, and adjust the opening of the desuperheating water regulating valve according to the opening control amount of the desuperheating water regulating valve.

9. An electronic device, characterized in that, It includes a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the intelligent control method for main steam temperature of the heating unit under the heat-driven power supply mode as described in any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed by a processor, implements the intelligent control method for main steam temperature of a heating unit under the heat-driven power supply mode as described in any one of claims 1-6.

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