Control method, device and equipment of steam regenerative coupling heat supply system and medium

Abstract

The invention relates to the technical field of automation control, in particular to a control method, device, equipment and medium of a steam regenerative coupling heat supply system.The method comprises the steps that a first target pressure value of a heat supply main pipe and a second target pressure value of a steam main pipe are obtained; the first target pressure value and a first feedback pressure value of the heat supply mother pipe are input into a first controller, and the first controller outputs a first control quantity based on a corresponding target parameter; the first control quantity, the second target pressure value and a second feedback pressure value of the steam main pipe are input into a second controller, and the second controller outputs a second control quantity based on a corresponding target parameter; and controlling the steam pressure regulating valve according to the second control quantity. According to the method, cooperative stabilization of the pressure of the steam mother pipe and the heat supply mother pipe can be achieved, mutual influence of the pressure of the steam side and the heat supply side in the steam regenerative coupling system is avoided, and safe and stable operation of the induced draft fan is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automation control, and in particular to a control method, device, equipment and medium of a steam regenerative coupled heating system. BACKGROUND

[0002] With the proposal of the carbon peak and carbon neutralization targets, building a new power system mainly based on new energy has become a top priority for China to build a new development pattern and comprehensively support the energy revolution. For the steam-driven induced draft fan of the million ultra-supercritical double-reheat unit, there is an import throttling loss in the actual operation of the small steam turbine. Combined with the dispatching mode of the power grid, the steam and electricity dual-drive induced draft fan technology is adopted to greatly reduce the station service power rate, the small steam turbine maintains high efficiency under different loads, and the energy-saving effect of the steam-driven induced draft fan is significant when running at low load. The electric motor / generator balances the power without throttling loss. At the same time, the operation mode is flexible, and the steam and electricity dual-drive induced draft fan operation mode can be changed.

[0003] Therefore, in the steam drive mode, it is necessary to ensure the safe and stable operation of the induced draft fan through automatic control logic, and also to ensure the stability of the heating pressure. SUMMARY

[0004] The present application provides a control method, device, equipment and medium of a steam regenerative coupled heating system, which can realize the coordinated stability of the steam main pipe and the heating main pipe pressure, avoid the mutual influence of the steam side and the heating side pressure in the steam regenerative coupled system, and ensure the safe and stable operation of the induced draft fan.

[0005] The first aspect of the present application provides a control method of a steam regenerative coupled heating system, the steam regenerative coupled heating system comprising a steam main pipe, an induced draft fan and a heating main pipe, steam of the steam main pipe is collected into the heating main pipe after doing work through the induced draft fan, and a steam pressure regulating valve is arranged on the steam main pipe, wherein the method comprises the following steps: obtaining a first target pressure value of the heating main pipe and a second target pressure value of the steam main pipe; inputting the first target pressure value and a first feedback pressure value of the heating main pipe into a first controller, the first controller outputting a first control amount based on the corresponding target parameter; inputting the first control amount, the second target pressure value and a second feedback pressure value of the steam main pipe into a second controller, the second controller outputting a second control amount based on the corresponding target parameter; and controlling the steam pressure regulating valve according to the second control amount.

[0006] Optionally, the first controller and the second controller adopt the same control mode, and the control formula is: ; wherein, is the control amount, is the controller gain coefficient, is the damping ratio, is the differential coefficient. For class integral coefficients, These are variables in the complex frequency domain.

[0007] Optionally, before inputting the first target pressure value and the first feedback pressure value of the heating main pipe into the first controller, the method further includes: obtaining the characteristic parameters of the controlled object corresponding to each controller, and obtaining the control target of the steam regenerative coupled heating system under deep peak shaving conditions; setting the initial parameters of the corresponding controller based on the characteristic parameters of the controlled object, optimizing the initial parameters using a simulation platform until the control target is met, and obtaining the target parameters of the corresponding controller.

[0008] Optionally, the characteristic parameters include steady-state gain, time constant, delay time, and open-loop settling time. The initial parameters of the corresponding controller are set based on the characteristic parameters of the controlled object, including: acquiring the state of the rise curve of the controlled object; and setting the initial parameters of the corresponding controller based on the state of the rise curve of the controlled object and the characteristic parameters of the controlled object.

[0009] Optionally, the characteristic parameters of the controlled object corresponding to each controller are obtained, including: when the steam regenerative coupled heating system is in the target state, increasing the valve opening of the steam header pressure regulating valve, and calculating the characteristic parameters of the controlled object corresponding to the first controller based on the target plotting method; when the steam regenerative coupled heating system is in the target state, increasing the output of the induced draft fan of the steam regenerative coupled heating system until the pressure of the heating header reaches the threshold, and calculating the characteristic parameters of the controlled object corresponding to the second controller based on the target plotting method.

[0010] Optionally, the initial parameters include at least one of the following: gain coefficient, damping ratio, derivative coefficient, and the ratio of derivative coefficient to integral coefficient. The initial parameters of the corresponding controller are set based on the state of the controlled object's rise curve and the characteristic parameters of the controlled object, including: if the state of the controlled object's rise curve is a first state, then the ratio is a first value or a second value; if the state of the controlled object's rise curve is a second state, then the ratio is a first value; the gain coefficient is calculated based on the steady-state gain and the ratio, and the derivative coefficient is determined based on the preset closed-loop adjustment time and time constant.

[0011] Optionally, while optimizing the initial parameters using the simulation platform, the method also includes: obtaining the control performance index corresponding to each controlled object; controlling the closed-loop control effect of each controlled object to achieve the control performance index, wherein the control performance index is that the closed-loop adjustment time of the controlled object is less than or equal to the preset closed-loop adjustment time.

[0012] A second aspect of this application provides a control device for a steam regenerative coupled heating system. The steam regenerative coupled heating system includes a steam header, an induced draft fan, and a heating header. Steam from the steam header is collected into the heating header after being powered by the induced draft fan. A steam pressure regulating valve is installed on the steam header. The device includes: an acquisition module for acquiring a first target pressure value of the heating header and a second target pressure value of the steam header; a first input module for inputting the first target pressure value and a first feedback pressure value of the heating header into a first controller, which outputs a first control quantity based on corresponding target parameters; a second input module for inputting the first control quantity, the second target pressure value, and the second feedback pressure value of the steam header into a second controller, which outputs a second control quantity based on corresponding target parameters; and a control module for controlling the steam pressure regulating valve according to the second control quantity.

[0013] Optionally, the first controller and the second controller adopt the same control method, and the control formula is: ; in, To control the quantity, The controller gain coefficient. For the damping ratio, For class differential coefficients, For class integral coefficients, These are variables in the complex frequency domain.

[0014] Optionally, it also includes: an optimization module, used to obtain the characteristic parameters of the controlled object corresponding to each controller and obtain the control target of the steam regenerative coupled heating system under deep peak shaving conditions before inputting the first target pressure value and the first feedback pressure value of the heating header into the first controller; set the initial parameters of the corresponding controller based on the characteristic parameters of the controlled object, optimize the initial parameters using a simulation platform until the control target is met, and obtain the target parameters of the corresponding controller.

[0015] Optionally, the characteristic parameters include steady-state gain, time constant, delay time, and open-loop settling time. The optimization module is further used to: obtain the state of the rise curve of the controlled object; and set the initial parameters of the corresponding controller based on the state of the rise curve of the controlled object and the characteristic parameters of the controlled object.

[0016] Optionally, the optimization module is further configured to: increase the valve opening of the steam header pressure regulating valve when the steam regenerative coupled heating system is in the target state, and calculate the characteristic parameters of the controlled object corresponding to the first controller based on the target plotting method; and increase the output of the induced draft fan of the steam regenerative coupled heating system when the steam regenerative coupled heating system is in the target state, until the pressure of the heating header reaches the threshold, and calculate the characteristic parameters of the controlled object corresponding to the second controller based on the target plotting method.

[0017] Optionally, the initial parameters include at least one of the following: gain coefficient, damping ratio, derivative coefficient, and the ratio of derivative coefficient to integral coefficient.

[0018] Optionally, the optimization module is further configured to: if the state of the rise curve of the controlled object is the first state, then the ratio is a first value or a second value; if the state of the rise curve of the controlled object is the second state, then the ratio is a first value; calculate the gain coefficient based on the steady-state gain and the ratio, and determine the derivative coefficient based on the preset closed-loop adjustment time and time constant.

[0019] Optionally, it also includes: a first control module, used to obtain the control performance index corresponding to each controlled object while optimizing the initial parameters using the simulation platform; and to control the closed-loop control effect of each controlled object to achieve the control performance index, wherein the control performance index is that the closed-loop adjustment time of the controlled object is less than or equal to the preset closed-loop adjustment time.

[0020] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to perform a control method for a steam regenerative coupled heating system as described above.

[0021] A fourth aspect of this application provides a computer-readable storage medium having a computer program or instructions stored thereon, which is executed by a processor to perform a control method for a steam regenerative coupled heating system as described above.

[0022] The fifth aspect of this application provides a computer program product, including a computer program or instructions, which, when executed, implement the control method of the steam regenerative coupled heating system as described in the above embodiments.

[0023] Therefore, this application has at least the following beneficial effects: This application embodiment can use a two-layer closed-loop control architecture. The first layer inputs the first target pressure value and the first feedback pressure value into the first controller and outputs a first control quantity to reflect the pressure regulation requirements on the heating side. The second layer inputs the first control quantity, the second target pressure value, and the second feedback pressure value into the second controller and outputs a second control quantity. Then, the steam pressure regulating valve is controlled according to the second control quantity to avoid mutual influence between the steam side and the heating side pressure in the steam regeneration coupling system. It can also achieve coordinated stability of the steam header and the heating header pressure, avoid the pressure fluctuation on one side caused by single control affecting the operating conditions on the other side, and ensure the safe and stable operation of the induced draft fan.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a control method for a steam regenerative coupled heating system provided according to an embodiment of this application; Figure 2 This is a process principle diagram of the steam regeneration process in the steam-driven mode of the steam-driven turbine according to the embodiments of this application; Figure 3 This is a schematic diagram of the process design of a steam-powered induced draft fan back pressure steam turbine according to an embodiment of this application; Figure 4 This is a schematic diagram of the control loop of a steam regenerative coupled heating system provided according to an embodiment of this application; Figure 5 This is a schematic diagram of a PID (Proportional-Integral-Derivative) controller configuration according to an embodiment of this application. Figure 6 This is an example diagram of the control device for a steam regeneration coupled heating system provided according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application. Detailed Implementation

[0026] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0027] Under deep peak shaving conditions, due to the large number of system disturbance factors and the difficulty in tuning control parameters, traditional control schemes are difficult to ensure the stability of both the steam pressure and heating pressure before the induced draft fan. To address this, this application provides a control method for a steam regeneration coupled heating system, which can achieve automatic and stable operation of the induced draft fan in steam-driven operation, while ensuring the stability of both the steam pressure and heating pressure before the induced draft fan.

[0028] Specifically, Figure 1 This is a schematic flowchart illustrating a control method for a steam regeneration coupled heating system provided in an embodiment of this application.

[0029] The steam regenerative coupling heating system of this application embodiment includes a steam header, an induced draft fan, and a heating header. The steam in the steam header is collected into the heating header after being powered by the induced draft fan. A steam pressure regulating valve is installed on the steam header.

[0030] Specifically, such as Figure 2 and Figure 3 As shown, Figure 2 This is a schematic diagram of the steam regeneration process in the steam-driven mode of a small turbine. Figure 3 This is a schematic diagram of the process design for a steam-electric dual-drive steam-driven induced draft fan back-pressure steam turbine (i.e., a small steam-driven induced draft fan). The steam reheat coupling heating system extracts high-pressure steam from the secondary superheated steam of a 1,000 kW double reheat generator unit. The high-pressure steam from both sides of the boiler is collected into the steam header. After the high-pressure steam performs work on the two back-pressure steam turbines, it drives the induced draft fan through the gearbox. Then, the high-pressure steam is collected and enters the heating pipeline, and finally delivered to the heating users.

[0031] like Figure 1 As shown, the control method of this steam regenerative coupled heating system includes the following steps: In step S101, the first target pressure value of the heating main pipe and the second target pressure value of the steam main pipe are obtained.

[0032] The first target pressure value of the heating header is the preset pressure standard of the heating header, which can also be understood as the set value R2; the second target pressure value of the steam header is the preset pressure standard of the steam header, which can also be understood as the set value R1.

[0033] In step S102, the first target pressure value and the first feedback pressure value of the heating main pipe are input to the first controller, and the first controller outputs the first control quantity based on the corresponding target parameters.

[0034] The first feedback pressure is the actual pressure detection value PE2 of the heating main pipe, and the first controller is the heating main pipe pressure controller G. C2 .

[0035] It is understood that, in the embodiments of this application, the first target pressure value and the first feedback pressure of the heating main pipe can be input to the first controller, and the first controller outputs the first control quantity based on the corresponding target parameters.

[0036] The input signal of the first controller is And there are: .

[0037] Wherein, R2 is the first target pressure value of heating steam, and PE2 is the feedback pressure value of heating steam; In some embodiments of this application, the control formula of the first controller is: ; in, To control the quantity, The controller gain coefficient. For the damping ratio, These are the differential coefficients, which represent the expected controller bandwidth in the closed loop. These are the integral coefficients, i.e., the filtering parameters of the PID controller. These are variables in the complex frequency domain.

[0038] It is understood that the embodiments of this application , , When all three parameters are involved in the control, it is called three-parameter control.

[0039] Furthermore, it should be noted that the controller algorithm in the control method of this application embodiment needs to be converted into a PID module controller for use in actual applications. The PID module controller formula is as follows: ; in, This is the proportionality coefficient; The integration time; These are the differential coefficients; The time interval is the derivative. This refers to the controller gain coefficient; These are the integral coefficients, i.e., the filtering parameters of the PID controller; These are the differential coefficients, i.e., the expected controller bandwidth in the closed loop; The damping ratio is denoted as . , , When all three parameters are involved in the control, it is called three-parameter control.

[0040] The conversion relationship between the controller in this application embodiment and the traditional PID controller is as follows: .

[0041] In step S103, the first control quantity, the second target pressure value, and the second feedback pressure value of the steam header are input to the second controller, and the second controller outputs the second control quantity based on the corresponding target parameters.

[0042] The second feedback pressure value is the actual pressure detection value PE1 of the steam header, and the second controller is the steam header pressure controller G. C1 .

[0043] It is understood that, in the embodiments of this application, the first control quantity, the second target pressure value, and the second feedback pressure value of the steam header can be input into the second controller, and the second controller outputs the second control quantity based on the corresponding target parameters.

[0044] This application defines the embodiments. The controller's input signal is , The controller's output signal is Then we have: .

[0045] The first controller and the second controller in this application embodiment adopt the same control method, and the processing flow is similar to that of the first controller.

[0046] In some embodiments of this application, before inputting the first target pressure value and the first feedback pressure value of the heating main pipe into the first controller, the method further includes: obtaining the characteristic parameters of the controlled object corresponding to each controller, and obtaining the control target of the steam regeneration coupled heating system under deep peak shaving conditions; setting the initial parameters of the corresponding controller based on the characteristic parameters of the controlled object, optimizing the initial parameters using a simulation platform until the control target is met, and obtaining the target parameters of the corresponding controller.

[0047] The characteristic parameters include steady-state gain K, time constant T, delay time τ, and open-loop settling time t. s1 Initial parameters include the gain coefficient k, damping ratio ξ, and derivative-like coefficients. Differential coefficients With the coefficient of the class integral At least one of the ratios λ; the controlled object is the specific controlled object of the controller's locking action, the controlled object corresponding to the first controller is the heating header pressure regulation system, and the controlled object corresponding to the second controller is the steam header pressure regulation system; the deep peak shaving condition is when the power generation load is in a low load operation state of 20%-40% THA, at which time the steam regeneration coupled heating system has many disturbance factors and high parameter fluctuation risk; the control target is that within the power generation load of 20%-40% THA, the steam parameter fluctuation range is ≤ standard parameter ±5%, and the standard parameters of the steam header pressure are 9.0MPa and 473℃.

[0048] It is understood that the embodiments of this application can obtain the characteristic parameters of the controlled object corresponding to each controller, set control targets for deep peak shaving conditions, initially configure the controller's parameters based on the characteristic parameters of the controlled object, achieve accurate matching between the controller parameters and the characteristics of the controlled object, avoid poor control effect caused by blindly setting parameters, simulate system operation using a simulation platform, adjust the initial parameters until the controller output meets the control target, determine the final target parameters, ensure that the system can still achieve the preset control target under deep peak shaving conditions, and improve the operational stability and reliability in low load ranges.

[0049] In this embodiment of the application, the controller bandwidth With the desired closed-loop PID controller filter parameters The ratio is λ, and the formula is as follows: The range of adjustment for the λ parameter is: .

[0050] In some embodiments of this application, setting the initial parameters of the corresponding controller based on the characteristic parameters of the controlled object includes: obtaining the state of the ascent curve of the controlled object; and setting the initial parameters of the corresponding controller based on the state of the ascent curve of the controlled object and the characteristic parameters of the controlled object.

[0051] Among them, the rise curve is the curve of the output of the controlled object changing with time under the action of the input signal, which is the core basis for judging the state of the controlled object; the state includes the first state with no overshoot and the second state with overshoot.

[0052] It is understood that the embodiments of this application can set the initial parameters of the corresponding controller based on the state of the rise curve of the controlled object and the characteristic parameters of the controlled object, so as to avoid the blindness of parameter setting, improve the rationality of the initial parameters, and distinguish the dynamic characteristic type of the controlled object by judging the state of the rise curve, and provide differentiated parameter setting logic for different types of controlled objects.

[0053] In some embodiments of this application, obtaining the characteristic parameters of the controlled object corresponding to each controller includes: increasing the valve opening of the steam header pressure regulating valve when the steam regenerative coupled heating system is in the target state, and calculating the characteristic parameters of the controlled object corresponding to the first controller based on the target plotting method; increasing the output of the induced draft fan of the steam regenerative coupled heating system until the pressure of the heating header reaches the threshold when the steam regenerative coupled heating system is in the target state, and calculating the characteristic parameters of the controlled object corresponding to the second controller based on the target plotting method.

[0054] The target state can also be understood as the steady state, where the system parameters do not fluctuate significantly.

[0055] It is understood that the embodiments of this application can design differentiated test inputs for the different characteristics of the controlled objects on the steam side and the heating side, thereby improving the pertinence and reliability of the characteristic parameters. This includes: increasing the valve opening of the steam header pressure regulating valve when the steam regenerative coupled heating system is in the target state, calculating the rise curve of the controlled object corresponding to the first controller based on the target plotting method, increasing the output of the induced draft fan of the steam regenerative coupled heating system when the steam regenerative coupled heating system is in the target state, until the pressure of the heating header reaches the threshold, and calculating the characteristic parameters of the controlled object corresponding to the second controller based on the target plotting method.

[0056] Specifically, in this application embodiment, obtaining the characteristic parameters of the controlled object corresponding to the first controller includes: Under steady-state conditions, the operators increase the output of the induced draft fan by 2%. After the pressure in the heating main pipe stabilizes, the steady-state gain K, the time parameter T of the approximate first-order or second-order inertial plus pure delay system, and the corresponding delay time are calculated using conventional graphical methods. and open-loop adjustment time t s1 ; Obtaining the characteristic parameters of the controlled object corresponding to the first controller includes: under steady-state conditions, increasing the opening of the steam header pressure regulating valve by 5%, and using conventional graphical methods, calculating the steady-state gain K, the time parameter T of the approximate first-order or second-order inertial plus pure delay system, and the corresponding delay time. and open-loop adjustment time t s1 .

[0057] In some embodiments of this application, the initial parameters of the corresponding controller are set based on the state of the rise curve of the controlled object and the characteristic parameters of the controlled object, including: if the state of the rise curve of the controlled object is a first state, then the ratio is a first value or a second value; if the state of the rise curve of the controlled object is a second state, then the ratio is a first value; the gain coefficient is calculated based on the steady-state gain and the ratio, and the derivative coefficient is determined based on the open-loop settling time and the time constant.

[0058] The first state is that the ascent curve has no overshoot, indicating that the dynamic characteristics of the controlled object are stable and there is no risk of oscillation; the second state is that the ascent curve has overshoot, indicating that the controlled object is prone to oscillation and the parameters need to be set conservatively; the first value is 0.1 and the second value is 1.

[0059] It is understood that the embodiments of this application can determine the corresponding ratio λ based on the ascent curve state of the controlled object. For controlled objects with different characteristics, the initial parameter settings are made more targeted by setting the λ value differently, avoiding poor control effect caused by uniform parameters. The gain coefficient k is calculated based on the steady-state gain and the ratio, and based on the preset closed-loop adjustment time. The time constant T determines the class differential coefficients.

[0060] In this application embodiment, λ is used as a key ratio to balance response speed and stability. The initial value setting must be close to the oscillation potential of the controlled object. The larger λ is, the more aggressive the control (fast response but prone to oscillation); the smaller λ is, the more conservative the control (slow response but more stable). Whether the rise curve overshoots directly reflects this potential.

[0061] Specifically, the process for determining the initial parameters of the controller in this application embodiment is as follows: If the rise curve of the controlled object has no overshoot, it indicates that the controlled object is stable and has no risk of oscillation. The initial value of λ can be flexibly selected according to the specific situation. Choosing an initial value of λ of 1 prioritizes response speed, while choosing an initial value of λ of 0.1 prioritizes ensuring stability. If the rise curve of the controlled object has overshoot, it indicates that the controlled object is prone to oscillation. Therefore, the initial value of λ is chosen as 0.1 to prioritize ensuring stability. The initial value of the damping ratio ξ is 1. The initial value of the controller gain coefficient k is... The relationship is PID controller bandwidth The initial values ​​are chosen as follows: The smaller value.

[0062] In some embodiments of this application, while optimizing the initial parameters using a simulation platform, the method further includes: obtaining the control performance index corresponding to each controlled object; controlling the closed-loop control effect of each controlled object to achieve the control performance index, wherein the control performance index is that the closed-loop adjustment time of the controlled object is less than or equal to the preset closed-loop adjustment time.

[0063] Among them, the closed-loop adjustment time of the controlled object is less than or equal to the preset closed-loop adjustment time. .

[0064] It is understood that, in the process of optimizing the initial parameters on the simulation platform, the closed-loop control effect of the controlled object is monitored in real time. Only when the closed-loop control effect meets the performance indicators is the final controller parameter determined. Otherwise, the optimization continues to ensure that the optimized controller parameter not only meets the pressure fluctuation requirements, but also ensures the speed of control response, avoids the fluctuation of operating conditions caused by adjustment lag, further improves the operating stability of the system under deep peak shaving conditions, and avoids the expansion of pressure deviation due to excessive adjustment time.

[0065] In step S104, the steam pressure regulating valve is controlled according to the second control quantity.

[0066] This application embodiment can use a two-layer closed-loop control architecture. The first layer inputs the first target pressure value and the first feedback pressure value into the first controller and outputs a first control quantity to reflect the pressure regulation demand on the heating side. The second layer inputs the first control quantity, the second target pressure value, and the second feedback pressure value into the second controller and outputs a second control quantity. Then, the steam pressure regulating valve is controlled according to the second control quantity to avoid mutual influence between the steam side and the heating side pressure in the steam regeneration coupling system. It can also achieve coordinated stability of the steam header and the heating header pressure, and avoid the pressure fluctuation on one side caused by a single control affecting the operating conditions on the other side.

[0067] Furthermore, it should be noted that the first controller in this application embodiment adopts a three-parameter control and tuning method, while the second controller adopts a two-parameter control and tuning method. In the two-parameter control process, only the PI action is used, and the derivative action is not used. Set to 0, Set to 1, , Performing calculations can Set to 0, Set to 1, , Performing calculations, i.e., the two-parameter control method, yields the following parameter transformation formula: .

[0068] This application also provides a control system for a steam regenerative coupled heating system. The design objective of the control system is to achieve... Figure 4 The control loop shown maintains the steam header pressure PE1 and the heating pipeline pressure PE2 at a basically stable level according to process requirements. The heating pipeline pressure setpoint R2 and the heating pipeline pressure controller G are specified. C2 The first controller, calculation unit 2, and steam pressure regulating valve V1 together form the outer loop control circuit; the steam header setpoint R1 and the steam header pressure controller G... C1 The second controller, the calculation unit 1, and the steam pressure regulating valve V1 together form the inner loop control circuit.

[0069] In addition, the heating pipeline pressure setpoint R2 and the heating pipeline pressure feedback value PE2 are used as the heating pipeline pressure controller G after calculation step 2. C2 The input signal and its output signal enter the calculation stage 1; the heating pipeline pressure controller G C2 The output signal, steam header pressure setpoint R1, and steam header pressure feedback value PE1 are processed by calculation unit 1 and then input to the steam header pressure controller G. C1 Its output signal (i.e., control quantity) enters the steam pressure regulating valve V1.

[0070] The controller in this embodiment needs to be converted into a PID controller for practical application.

[0071] The heating pipeline pressure controller G in this application embodiment C2 and steam main pipeline pressure controller G C1 All adopt the same controller design scheme, and the controller formula is: ; The formula for the PID module controller in a practical DCS (Distributed Control System) system is as follows: ; in, This is the proportionality coefficient; The integration time; These are the differential coefficients; The time interval is the derivative. This refers to the controller gain coefficient; These are the integral coefficients, i.e., the filtering parameters of the PID controller; These are the differential coefficients, i.e., the expected controller bandwidth in the closed loop; The damping ratio is denoted as . , , When all three parameters are involved in the control, it is called three-parameter control.

[0072] Based on the standard PID controller module of the DCS system, the conversion relationship between the controller in this embodiment and the traditional PID controller is as follows: ; definition The controller's input signal is And there are: ; Wherein, R2 is the set value of heating steam pressure, and PE2 is the feedback value of heating steam pressure; definition The controller's input signal is , The controller's output signal is Then we have: .

[0073] During the control process, the standard parameters of the steam header pressure are 9.0 MPa and 473℃. The control system can meet the requirements of steam parameter fluctuation range ≤ standard parameter ±5% within the power generation load range of 20%-40% THA.

[0074] The controller algorithm and PID module in this application embodiment need to be set through a conversion formula. For cases where only the PI action is used and the derivative action is not used, the following can be used: Set to 0, Set to 1, , Performing calculations can Set to 0, Set to 1, , Performing calculations, i.e., the two-parameter control method, yields: .

[0075] The controller bandwidth of this application embodiment With the desired closed-loop PID controller filter parameters The ratio is λ, and the formula is as follows: The range of the λ parameter adjustment is: .

[0076] The parameter determination process, or parameter determination process, for the controller in this embodiment is as follows: Step 1: Based on the controller design method, configure the control algorithm on the DCS control system.

[0077] Step 2: Obtain the steady-state gain K of the controlled object, the time parameter T of the approximate first-order or second-order inertial plus pure delay system, and the delay time. and open-loop adjustment time t s1 .

[0078] The method for obtaining the steady-state parameters of the controlled object is as follows: The steady-state parameters of the controlled object corresponding to the outer loop heating main pipe pressure controller are as follows: Under steady-state conditions, the operator increases the output of the induced draft fan by 2%. After the heating main pipe pressure stabilizes, the steady-state gain Kn, the time parameter Tn of the approximate first-order or second-order inertial plus pure delay system, and the corresponding delay time are calculated using a conventional graphical method. And the open-loop adjustment time tsn; The steady-state parameters of the controlled object corresponding to the inner loop steam header pressure controller are as follows: Under steady-state conditions, by increasing the opening of the steam header pressure regulating valve by 5%, and using conventional graphical methods, the steady-state gain Kw, the time parameter Tw of the approximate first-order or second-order inertial plus pure delay system, and the corresponding delay time are calculated. And the open-loop adjustment time tsw.

[0079] Step 3: Increase controller bandwidth With the desired closed-loop PID controller filter parameters The ratio is λ, then , Based on the ascent curve, set λ, ξ, Given the initial values ​​of k, calculate the integral time in the PID controller based on these initial values. proportionality coefficient Differential time and differential coefficients Then proceed to step 4, or step 6.

[0080] If the controlled object's ascent curve has no overshoot, the initial value of λ is selected as 1 or 0.1, and proceed to step 4; if the controlled object's ascent curve has overshoot, the initial value of λ is selected as 0.1, and proceed to step 6); the initial value of the damping ratio ξ is 1; the initial value of the controller gain coefficient k is... The relationship is PID controller bandwidth The initial values ​​are chosen as follows: The smaller value.

[0081] Step 4: Debug based on the simulation platform, gradually adjusting the controller gain coefficient k from the initial value until the closed-loop control effect meets the performance indicators. If it meets the indicators, proceed to step 8; otherwise, record the optimal k value and proceed to step 5. Performance indicators include a closed-loop settling time less than or equal to the design value t. s2 And the system has no overshoot; Step 5: Debug based on the simulation platform, gradually increasing or decreasing the initial value. Each time it increases Then, starting from half of the optimal k value, the controller gain coefficient k is gradually adjusted to ensure that the closed-loop control effect meets the performance index and proceeds to step 8; each time the value is decreased... Then, starting from the optimal value of k, the controller gain coefficient k is gradually adjusted so that the closed-loop control effect meets the performance indicators and proceeds to step 8; the performance indicators include a closed-loop settling time less than or equal to the design value t. s2 And the system has no overshoot; Step 6: Debug based on the simulation platform, gradually adjusting the controller gain coefficient k from the initial value until the closed-loop control effect meets the performance indicators. If it meets the indicators, proceed to step 8; otherwise, record the optimal k value and proceed to step 7. Performance indicators include a closed-loop settling time less than or equal to the design value t. s2 And the system has no overshoot; Step 7: Debug based on the simulation platform. Gradually decrease the damping ratio ξ from the initial value. Each time the damping ratio ξ is decreased, gradually adjust the controller gain coefficient k from the optimal k value in Step 6. Debug based on the simulation platform until the closed-loop control effect meets the performance indicators and proceed to Step 8. The performance indicators include a closed-loop settling time less than or equal to the design value t. s2 And the system has no overshoot; Step 8: Select the controller gain coefficient k that satisfies the performance index for closed-loop control, and adjust the integral time of the PID controller accordingly. proportionality coefficient Differential time and differential coefficients Configure the control logic. Figure 5 This is a schematic diagram of the controller configuration, and it has been put into operation.

[0082] The outer loop control loop of this application adopts a three-parameter control and tuning method, while the inner loop control loop adopts a two-parameter control and tuning method.

[0083] According to the control method of the steam regenerative coupled heating system proposed in the embodiments of this application, a two-layer closed-loop control architecture can be used. The first layer inputs the first target pressure value and the first feedback pressure value into the first controller and outputs the first control quantity, reflecting the pressure regulation demand on the heating side. The second layer inputs the first control quantity, the second target pressure value, and the second feedback pressure value into the second controller and outputs the second control quantity. Then, the steam pressure regulating valve is controlled according to the second control quantity, so as to avoid the mutual influence between the steam side and the heating side pressure in the steam regenerative coupled system. It can also achieve coordinated stability of the steam header and the heating header pressure, avoid the pressure fluctuation on one side caused by single control affecting the operating conditions on the other side, and ensure the safe and stable operation of the induced draft fan.

[0084] Next, the control device for the steam regeneration coupled heating system proposed according to the embodiments of this application is described with reference to the accompanying drawings.

[0085] Figure 6 This is a block diagram of the control device of the steam regeneration coupled heating system according to an embodiment of this application.

[0086] The steam regeneration coupled heating system includes a steam header, an induced draft fan, and a heating header. Steam from the steam header is collected into the heating header after being powered by the induced draft fan. A steam pressure regulating valve is installed on the steam header.

[0087] like Figure 6 As shown, the control device 10 of the steam regeneration coupled heating system includes: an acquisition module 100, a first input module 200, a second input module 300, and a control module 400.

[0088] The acquisition module 100 is used to acquire the first target pressure value of the heating header and the second target pressure value of the steam header; the first input module 200 is used to input the first target pressure value and the first feedback pressure value of the heating header into the first controller, and the first controller outputs a first control quantity based on the corresponding target parameters; the second input module 300 is used to input the first control quantity, the second target pressure value and the second feedback pressure value of the steam header into the second controller, and the second controller outputs a second control quantity based on the corresponding target parameters; the control module 400 is used to control the steam pressure regulating valve according to the second control quantity.

[0089] In some embodiments of this application, the first controller and the second controller employ the same control method, and the control formula is as follows: ; in, To control the quantity, The controller gain coefficient. For the damping ratio, For class differential coefficients, For class integral coefficients, These are variables in the complex frequency domain.

[0090] In some embodiments of this application, the apparatus 10 of this application embodiment further includes an optimization module.

[0091] The optimization module is used to obtain the characteristic parameters of the controlled object corresponding to each controller before inputting the first target pressure value and the first feedback pressure value of the heating main pipe into the first controller, and to obtain the control target of the steam regeneration coupled heating system under deep peak shaving conditions; based on the characteristic parameters of the controlled object, the initial parameters of the corresponding controller are set, and the initial parameters are optimized using the simulation platform until the control target is met, so as to obtain the target parameters of the corresponding controller.

[0092] In some embodiments of this application, the characteristic parameters include steady-state gain, time constant, delay time, and open-loop settling time.

[0093] In some embodiments of this application, the optimization module is further configured to: obtain the state of the ascent curve of the controlled object; and set the initial parameters of the corresponding controller based on the state of the ascent curve of the controlled object and the characteristic parameters of the controlled object.

[0094] In some embodiments of this application, the optimization module is further configured to: increase the valve opening of the steam header pressure regulating valve when the steam regenerative coupled heating system is in the target state, and calculate the characteristic parameters of the controlled object corresponding to the first controller based on the target plotting method; increase the output of the induced draft fan of the steam regenerative coupled heating system when the steam regenerative coupled heating system is in the target state, until the pressure of the heating header reaches the threshold, and calculate the characteristic parameters of the controlled object corresponding to the second controller based on the target plotting method.

[0095] In some embodiments of this application, the initial parameters include at least one of the following: gain coefficient, damping ratio, analog derivative coefficient, and the ratio of analog derivative coefficient to analog integral coefficient.

[0096] In some embodiments of this application, the optimization module is further configured to: if the state of the rise curve of the controlled object is a first state, then the ratio is a first value or a second value; if the state of the rise curve of the controlled object is a second state, then the ratio is a first value; calculate the gain coefficient based on the steady-state gain and the ratio, and determine the derivative coefficient based on the preset closed-loop adjustment time and time constant.

[0097] In some embodiments of this application, the apparatus 10 of this application embodiment further includes: a first control module.

[0098] The first control module is used to optimize the initial parameters using the simulation platform, obtain the control performance index corresponding to each controlled object, and control the closed-loop control effect of each controlled object to achieve the control performance index, wherein the control performance index is that the closed-loop adjustment time of the controlled object is less than or equal to the preset closed-loop adjustment time.

[0099] It should be noted that the explanation of the control method embodiment for the steam regeneration coupled heating system described above also applies to the control device of the steam regeneration coupled heating system in this embodiment, and will not be repeated here.

[0100] According to the control device of the steam regenerative coupled heating system proposed in the embodiments of this application, a two-layer closed-loop control architecture can be used. The first layer inputs the first target pressure value and the first feedback pressure value into the first controller and outputs the first control quantity to reflect the pressure regulation demand on the heating side. The second layer inputs the first control quantity, the second target pressure value and the second feedback pressure value into the second controller and outputs the second control quantity. Then, the steam pressure regulating valve is controlled according to the second control quantity to avoid mutual influence between the steam side and the heating side pressure in the steam regenerative coupled system. It can also achieve coordinated stability of the steam header and the heating header pressure, avoid the pressure fluctuation on one side caused by single control affecting the operating condition on the other side, and ensure the safe and stable operation of the induced draft fan.

[0101] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 701, the processor 702, and the computer program stored on the memory 701 and executable on the processor 702.

[0102] When the processor 702 executes the program, it implements the control method of the steam regeneration coupled heating system provided in the above embodiments.

[0103] Furthermore, electronic devices also include: Communication interface 703 is used for communication between memory 701 and processor 702.

[0104] The memory 701 is used to store computer programs that can run on the processor 702.

[0105] The memory 701 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0106] If the memory 701, processor 702, and communication interface 703 are implemented independently, then the communication interface 703, memory 701, and processor 702 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized into address buses, data buses, control buses, etc. For ease of representation, Figure 7 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0107] Optionally, in a specific implementation, if the memory 701, processor 702, and communication interface 703 are integrated on a single chip, then the memory 701, processor 702, and communication interface 703 can communicate with each other through an internal interface.

[0108] The processor 702 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0109] This application also provides a computer-readable storage medium storing a computer program or instructions thereon, which, when executed by a processor, implements the control method of the steam regenerative coupled heating system described above.

[0110] This application also provides a computer program product, including a computer program or instructions, which, when executed, implement the control method for the steam regeneration coupled heating system described above.

[0111] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0112] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0113] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0114] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0115] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

Claims

1. A control method for a steam regenerative coupled heating system, characterized in that, The steam regenerative coupling heating system includes a steam header, an induced draft fan, and a heating header. Steam from the steam header is collected in the heating header after being powered by the induced draft fan. A steam pressure regulating valve is installed on the steam header. The method includes the following steps: Obtain the first target pressure value of the heating main pipe and the second target pressure value of the steam main pipe; The first target pressure value and the first feedback pressure value of the heating main pipe are input into the first controller, and the first controller outputs a first control quantity based on the corresponding target parameters. The first control quantity, the second target pressure value, and the second feedback pressure value of the steam header are input into the second controller, and the second controller outputs the second control quantity based on the corresponding target parameters. The steam pressure regulating valve is controlled according to the second control quantity.

2. The control method for the steam regenerative coupled heating system according to claim 1, characterized in that, The first controller and the second controller use the same control method, and the control formula is as follows: ； in, To control the quantity, The controller gain coefficient. For the damping ratio, For class differential coefficients, For class integral coefficients, These are variables in the complex frequency domain.

3. The control method for the steam regenerative coupled heating system according to claim 1, characterized in that, Before inputting the first target pressure value and the first feedback pressure value of the heating main pipe into the first controller, the method further includes: Obtain the characteristic parameters of the controlled object corresponding to each controller, and obtain the control target of the steam regeneration coupled heating system under deep peak shaving conditions; Based on the characteristic parameters of the controlled object, the initial parameters of the corresponding controller are set, and the initial parameters are optimized using a simulation platform until the control objective is met, thereby obtaining the target parameters of the corresponding controller.

4. The control method for the steam regenerative coupled heating system according to claim 3, wherein the characteristic parameters include steady-state gain, time constant, delay time, and open-loop settling time, and the step of setting the initial parameters of the corresponding controller based on the characteristic parameters of the controlled object includes: Obtain the state of the ascent curve of the controlled object; The initial parameters of the corresponding controller are set based on the state of the controlled object's ascent curve and the characteristic parameters of the controlled object.

5. The control method for the steam regenerative coupled heating system according to claim 4, characterized in that, The process of obtaining the characteristic parameters of the controlled object corresponding to each controller includes: When the steam regenerative coupling heating system is in the target state, the valve opening of the steam header pressure regulating valve is increased, and the characteristic parameters of the controlled object corresponding to the first controller are calculated based on the target plotting method. When the steam regenerative coupled heating system is in the target state, the output of the induced draft fan of the steam regenerative coupled heating system is increased until the pressure of the heating main pipe reaches the threshold. Based on the target plotting method, the characteristic parameters of the controlled object corresponding to the second controller are calculated.

6. The control method for the steam regenerative coupled heating system according to claim 4, characterized in that, The initial parameters include at least one of the following: gain coefficient, damping ratio, derivative-like coefficient, and the ratio of derivative-like coefficient to integral-like coefficient. Setting the initial parameters of the corresponding controller based on the state of the controlled object's ascent curve and the characteristic parameters of the controlled object includes: If the ascent curve of the controlled object is in the first state, then the ratio is either a first value or a second value. If the ascent curve of the controlled object is in the second state, then the ratio is the first value; The gain coefficient is calculated based on the steady-state gain and the ratio, and the derivative coefficient is determined based on the preset closed-loop adjustment time and the time constant.

7. The control method for the steam regenerative coupled heating system according to claim 3, characterized in that, In addition to optimizing the initial parameters using a simulation platform, the following are also included: Obtain the control performance index corresponding to each controlled object; The closed-loop control effect of each controlled object is controlled to achieve the control performance index, wherein the control performance index is that the closed-loop adjustment time of the controlled object is less than or equal to the preset closed-loop adjustment time.

8. A control device for a steam regenerative coupled heating system, characterized in that, The steam regenerative coupling heating system includes a steam header, an induced draft fan, and a heating header. Steam from the steam header, after being powered by the induced draft fan, is collected and enters the heating header. A steam pressure regulating valve is installed on the steam header. The device includes: The acquisition module is used to acquire the first target pressure value of the heating header and the second target pressure value of the steam header; The first input module is used to input the first target pressure value and the first feedback pressure value of the heating main pipe into the first controller, and the first controller outputs a first control quantity based on the corresponding target parameters. The second input module is used to input the first control quantity, the second target pressure value and the second feedback pressure value of the steam header into the second controller, and the second controller outputs the second control quantity based on the corresponding target parameters. A control module is used to control the steam pressure regulating valve according to the second control quantity.

9. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the control method for the steam regenerative coupled heating system as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, The computer program or instructions are executed by a processor to implement the control method for the steam regenerative coupled heating system as described in any one of claims 1-7.

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