A method and system for intelligent fusion control of process variables with different production processes

Abstract

This invention relates to the field of power plant production process automation technology, and discloses an intelligent fusion control method and system for disparate variables in the production process. The control method includes: when the PID control loop is in automatic operation mode, using a high / low limit monitor to detect the regulator inlet deviation; if the regulator inlet deviation is not less than a first preset value, controlling the first switch to switch ports; under the control of the override correction function, if the regulator inlet deviation recovers to less than the first preset value, controlling the first AND gate to output logic 1, controlling the second switch to switch ports, and simultaneously controlling the first switch to switch ports again. By utilizing intelligent control algorithms, completely different control modes are integrated into fully automatic program control, achieving autonomous correction of the analog regulator inlet deviation, forming a completely new modern fully automatic control system.

Description

Technical Field

[0001] This invention relates to the field of power plant production process automation technology, specifically to an intelligent fusion control method and system for disparate variables in the production process. Background Technology

[0002] There are various controlled objects in the process control of thermal power plants, such as switching quantities, analog quantities, and pulse quantities. These variables have completely different characteristics and are called "dissimilar variables". There are multiple control modes for dissimilar variables, each of which can be independently applied in traditional control methods.

[0003] Due to the unrelated nature of "disparate variable" controls, for example, simple switching quantities can achieve sequential automatic control, which uses a single domino logic where the variables are discrete. Analog quantities are continuous, and PID regulation is automatic, but some operations are manual before the analog quantity PID regulation begins. For example, to reduce the disturbance when the analog quantity regulation is put into automatic operation (excessive disturbance will cause the regulator to oscillate, and in severe cases, it will diverge and fail to work), the regulator input deviation Δ must be less than a specified value, such as ±10%, and this target must also be achieved manually. If analog quantity regulation is added to the sequential control of switching quantities, it will block the automatic process of the sequential control steps, making it impossible to achieve fully automatic control of the steps. Therefore, when sequential control of switching quantities and analog quantity regulation, which constitute disparate variables and different control modes, are combined, the conclusion is clear: traditional control methods simply cannot meet the requirements of full automation, but full automation is a control method urgently needed by modern thermal power generating units to ensure operational safety and improve economic efficiency. Summary of the Invention

[0004] In view of this, the present invention provides an intelligent fusion control method and system for disparate variables in a production process, in order to solve the problem that traditional control methods cannot achieve fully automatic control of disparate variables throughout the process.

[0005] In a first aspect, the present invention provides an intelligent fusion control method for disparate variables in a production process, the method comprising:

[0006] When the PID control loop is in automatic mode, the high and low limit monitor is used to detect the controller inlet deviation.

[0007] If the regulator inlet deviation is not less than the first preset value, the first switcher is controlled to switch the port, the PID regulator is switched to tracking mode, the override correction function is connected to the regulation loop, and the override correction function is used to reduce the regulator inlet deviation.

[0008] Under the control of the override correction function, if the regulator input deviation recovers to less than the first preset value, the first AND gate output logic 1 is controlled, the second switch switches the port, the tracking function of the PID regulator is cut off, the PID algorithm function of the PID regulator is started, and the first switch switches the port again to connect the PID regulator to the regulation loop and remove the override correction function from the regulation loop.

[0009] This invention provides an intelligent fusion control method for disparate variables in a production process. By simulating human observation and judgment of the operation mode of analog quantity regulation loops and using logic algorithms to reproduce human thinking and decision-making, it monitors the operating status of process equipment in real time by sequentially controlling switching quantities. This allows for seamless connection of disparate variable step sequence control with different control modes combined together, and autonomously corrects the deviation at the analog quantity regulator inlet. It achieves the integration of disparate variables and forms a brand-new modern fully automatic control system.

[0010] In one optional implementation, the override correction function is integrated into the control loop to reduce the controller inlet deviation, including:

[0011] The output of the ramp generator is connected to the regulation circuit, and the ramp generator is triggered to start. The target value of the ramp generator is provided by the first constant current setpoint, and the slope of the ramp generator is given by the second constant current setpoint.

[0012] The ramp generator outputs an overshoot correction signal based on the target value and slope to reduce the regulator inlet deviation.

[0013] In an optional implementation, the method further includes:

[0014] The RS flip-flop is set according to the automatic adjustment command, the third switch is controlled to switch the port, the PID controller is connected to the adjustment loop, and the fourth switch is controlled to switch the port, outputting logic 1 to the second AND gate.

[0015] If the transmitter signal and actuator valve position are normal, the second AND gate outputs logic 1 to the first AND gate. If the regulator inlet deviation is less than the first preset value, the outlet valve is open, the equipment is running and the system parameters are met, the first AND gate outputs logic 1. At this time, the PID control loop is in automatic control mode.

[0016] If the transmitter signal and / or actuator valve position are abnormal, reset the RS trigger and switch back to manual control.

[0017] In an optional implementation, the method further includes:

[0018] If the transmitter signal and actuator valve position are normal, and any one of the following four conditions is not met: the regulator inlet deviation is less than the first preset value, the outlet valve is open, the equipment is running, and the system parameters are met, the first AND gate outputs 0, the second switch switches the port, and the tracking function of the PID regulator is started.

[0019] The second AND gate outputs 1, which inverts the logic 0 output of the first AND gate, triggering the PID control loop to enter automatic servo mode.

[0020] In an optional implementation, the method further includes:

[0021] When the PID control loop is in automatic servo mode, if the four conditions are met—the regulator inlet deviation is less than the first preset value, the outlet valve is open, the equipment is running, and the system parameters are satisfied—then the first AND gate outputs 1, and the PID control loop switches to automatic control mode.

[0022] Secondly, the present invention provides an intelligent fusion control system for disparate variables in a production process, the system comprising: a PID controller, a high / low limit monitor, a first switch, a second switch, a first AND gate, a ramp generator, a first constant current setpoint, and a second constant current setpoint, wherein...

[0023] The first input terminal of the PID controller is the deviation between the process value and the given value, and the output terminal of the PID controller is connected to the first moving contact of the first switch.

[0024] The high and low limit monitor inputs the deviation between the process value and the given value, and the output of the high and low limit monitor is connected to the control terminal of the first switch and the control terminal of the ramp generator, respectively.

[0025] The second moving contact of the first switch is connected to the output terminal of the ramp generator, and the stationary contact of the first switch is connected to the adjustment circuit.

[0026] The first input terminal of the ramp generator is connected to the first constant current setter, and the second input terminal of the ramp generator is connected to the second constant current setter;

[0027] The first moving contact of the second switch is connected to the second input terminal of the PID controller, the second moving contact of the second switch is connected to the regulation circuit, the stationary contact of the second switch is connected to the output terminal of the PID controller and the regulation circuit respectively, and the control terminal of the second switch is connected to the output terminal of the first AND gate.

[0028] The first input terminal of the first AND gate is connected to the signal that the inlet deviation is less than the first preset value; the second input terminal of the first AND gate is connected to the signal that the second outlet valve is open; the third input terminal of the first AND gate is connected to the signal that the equipment is running; the fourth input terminal of the first AND gate is connected to the signal that the system parameters are met; the fifth input terminal of the first AND gate is connected to the transmitter signal normal signal and the actuator valve position normal signal; and the output terminal of the first AND gate outputs the automatic adjustment signal.

[0029] The intelligent fusion control system for dissimilar variables in the production process is used to enable a computer to perform intelligent fusion control of dissimilar variables in the production process as described in the first aspect or any of its corresponding embodiments.

[0030] This invention provides an intelligent fusion control system for disparate variables in a production process. By simulating human observation and judgment of the operation mode of analog quantity regulation loops and using logic algorithms to reproduce human thinking and decision-making, it monitors the operating status of process equipment in real time by sequentially controlling switching quantities. This allows for seamless connection of disparate variable step sequence control with different control modes combined together, and autonomously corrects the deviation at the analog quantity regulator inlet. It achieves the integration of disparate variables and forms a brand-new modern fully automatic control system.

[0031] In one optional implementation, the system further includes: an RS flip-flop, a third switch, a fourth switch, a manual constant current setter, a second AND gate, a first digital input setter, a second digital input setter, a first NOT gate, and an OR gate, wherein,

[0032] The set terminal of the RS trigger is connected to the automatic button, and the output terminal of the RS trigger is connected to the control terminal of the third switch and the control terminal of the fourth switch respectively.

[0033] The first moving contact of the third switch is connected to the manual constant current setter, the second moving contact of the third switch is connected to the stationary contact of the first switch, and the stationary contact of the third switch is connected to the adjustment circuit.

[0034] The first moving contact of the fourth switch is connected to the first digital input device, the second moving contact of the fourth switch is connected to the second digital input device, and the stationary contact of the fourth switch is connected to the third input terminal of the second AND gate.

[0035] The first input terminal of the second AND gate is connected to the transmitter signal normal signal, the second input terminal of the second AND gate is connected to the actuator valve position normal signal, the output terminal of the second AND gate is connected to the fifth input terminal of the first AND gate, and the output terminal of the second AND gate is connected to the second input terminal of the OR gate via the first NOT gate.

[0036] The first input terminal of the OR gate is connected to a manual button, and the output terminal of the OR gate is connected to the reset terminal of the RS flip-flop.

[0037] In an optional implementation, the system further includes: a second NOT gate and a third AND gate, wherein,

[0038] The input terminal of the second NOT gate is connected to the output terminal of the first AND gate, the output terminal of the second NOT gate is connected to the first input terminal of the third AND gate, the second input terminal of the third AND gate is connected to the output terminal of the second AND gate, and the output terminal of the third AND gate outputs an automatic servo signal. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 It is a schematic diagram of traditional hybrid digital / analog control;

[0041] Figure 2 This is a flowchart illustrating the intelligent fusion control method for dissimilar variables in the production process according to an embodiment of the present invention.

[0042] Figure 3 This is an analog quantity adjustment, overshoot correction, and adaptive operating mode logic diagram according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the fully automatic control principle according to an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Traditional analog signal regulation cannot be integrated into switch sequential control. Simply mixing the control of disparate variables together results in a hybrid automatic / manual control scheme (see...). Figure 1Not only is it time-consuming and labor-intensive, but it also poses hidden dangers and risks to the safe operation of the unit due to human error. There have been many accident cases in the past, which have resulted in economic losses or even equipment damage.

[0046] According to an embodiment of the present invention, an embodiment of an intelligent fusion control method for dissimilar variables in a production process is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0047] This embodiment provides an intelligent fusion control method for disparate variables in a production process, which can be used in the aforementioned thermal power plant process system. Figure 2 This is a flowchart of an intelligent fusion control method for dissimilar variables in a production process according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps:

[0048] Step S1: When the PID control loop is in automatic operation mode, the high and low limit monitor is used to detect the regulator inlet deviation.

[0049] Specifically, the analog control loop switches between manual and automatic modes simply by pressing the "Auto" button on the M / A (Manual / Automatic) control panel. The automatic switching is then handled entirely by the adaptive logic. This adaptive logic first checks the quality of the automated instruments, including transmitters and actuators of control valves and dampers, to ensure they can operate normally for analog control. When the "Auto" button is pressed on the control loop's M / A control panel, after a series of adaptive logic calculations, the PID controller PI001 switches to automatic control mode.

[0050] The adaptive operating mode logic monitors whether the equipment in the process system has started, whether the process parameters meet the requirements, and whether the input deviation of the PID controller PI001 is appropriate. For example, after the process parameters meet the requirements and the process system has started operating, the high / low limit monitor H / L001 is used to detect whether the controller input deviation meets the requirements, that is, to determine whether the deviation between the process value PV and the setpoint SV meets the requirements. For analog quantity control overshoot correction and adaptive operating mode logic, see [link to relevant documentation]. Figure 3 .

[0051] Step S2: If the regulator input deviation is not less than the first preset value, control the first switcher K1 to switch the port, switch the PID regulator to tracking mode, and connect the override correction function to the regulation loop to reduce the regulator input deviation.

[0052] Specifically, if the high / low limit monitor H / L001 detects that the deviation between the process value PV and the setpoint SV is higher than or less than a first preset value, two trigger signals are issued: first, the output of the ramp generator V≯001 is connected to the regulation loop; second, the ramp generator V≯001 is triggered to start, and the ramp generator V≯001 outputs an overshoot correction signal according to the target value and slope to reduce the regulator inlet deviation. The target value of the ramp generator V≯001 is provided by the first constant current setpoint SG002, and the slope of the ramp generator V≯001 is given by the second constant current setpoint SG003.

[0053] For example, the two trigger signals are: first, disconnecting switches a and b of the first switch K1 and closing switches c and b, connecting to the output of the ramp generator V≯001. This output signal controls the controlled object, such as the process value of pressure, flow rate, or liquid level, reducing the inlet deviation of the PID controller PI001. This function is the "override correction" of the PID control loop. Second, it triggers the ramp generator V≯001 to start working. Its target value is provided by the first constant current setter SG002, and its slope is given by the second constant current setter SG003. The target value and slope are shown in [reference needed]. Figure 3 The slope curve in the diagram. The first preset value is ±10% of a given value.

[0054] Step S3: Under the control of the override correction function, if the regulator input deviation recovers to less than the first preset value, the first AND gate AND001 is controlled to output logic 1, the second switcher K3 is controlled to switch the port, the tracking function of the PID regulator is cut off, the PID algorithm function of the PID regulator is started, and the first switcher K1 is controlled to switch the port again, so that the PID regulator is connected to the regulation loop and the override correction function is removed from the regulation loop.

[0055] Specifically, under the override correction function control, when the input deviation of the PID controller PI001 is less than ±10% of the given value, the state of the input IN1 of the first AND gate AND001 changes to logic 1. At this point, all inputs of the first AND gate AND001 are logic 1, and the output of the first AND gate AND001 is logic 1. The signal it sends disconnects a and b of the second switch K3, cuts off the tracking of the PID controller PI001, and starts the PID algorithm of the PID controller PI001. At the same time, the high and low limit monitor H / L001 closes a and b of the first switch K1, connecting the output of the PID controller PI001 to the output MV of the control loop, and the analog control loop begins closed-loop negative feedback control.

[0056] Analog PID control is a traditional closed-loop negative feedback control method. Its control capability has inherent limitations; excessive input deviation can severely degrade control quality and even affect the normal operation of the control loop. Therefore, the transition from manual to automatic control in traditional PID control requires meticulous manual intervention to reduce the deviation to a limit before switching to automatic mode. This is both a characteristic and a significant drawback of analog PID control. The override correction scheme perfectly addresses these shortcomings. A new open-loop control loop is designed between the PID controller PI001 and the M / A switching logic, consisting of a high / low limit monitor H / L001, a ramp generator V≯001, a first constant current setpoint SG002, and a second constant current setpoint SG003. Once the regulator inlet deviation exceeds a certain value, such as ±10% of the SV setpoint, the ramp generator V≯001 is immediately triggered. Using the target value of the first constant current setpoint SG002 and the slope of the second constant current setpoint SG003, a correction command for the regulating loop is issued. Open-loop control reduces the deviation between the regulating loop process value PV and the setpoint SV. When the regulator inlet deviation is less than the setpoint, the regulating loop adaptively switches to closed-loop negative feedback automatic regulation. The implementation of this technical solution allows for the smooth sequential completion of the process system startup process using different control modes combined with varying variable step sequences, creating a completely new modern fully automatic control system.

[0057] This invention provides an intelligent fusion control method for disparate variables in a production process. By simulating human observation and judgment of the operation mode of analog quantity regulation loops and using logic algorithms to reproduce human thought processes, it monitors the operating status of process equipment controlled by sequential switching quantities in real time. It adaptively achieves seamless interaction between analog quantity regulation loops and automatic switching quantity sequential control, autonomously corrects deviations at the analog quantity regulator inlet, and seamlessly connects disparate variable sequence control with different control modes. This achieves the integration of disparate variables, forming a completely new modern fully automatic control system. It eliminates obstacles to the development of digital intelligent automation applications in thermal power plants, greatly reduces the probability of human error, shortens unit start-up and shutdown times, and further improves the safety performance and economic benefits of thermal power plants.

[0058] In one alternative implementation, the method further includes:

[0059] Step S4: Set the RS trigger according to the automatic adjustment instruction, control the third switcher K2 to switch the port, connect the PID controller to the adjustment loop, and at the same time control the fourth switcher K4 to switch the port, output logic 1 to the second AND gate AND002.

[0060] Step S5: If the transmitter signal and actuator valve position are normal, control the second AND gate AND002 to output logic 1 to the first AND gate AND001. If the regulator inlet deviation is less than the first preset value, the outlet valve is open, the equipment is running and the system parameters are met, control the second AND gate AND002 to output logic 1. At this time, the PID control loop is in automatic control mode.

[0061] Step S6: If the transmitter signal and / or actuator valve position are abnormal, reset the RS trigger and switch back to manual control.

[0062] Specifically, pressing the automatic button on the M / A control panel of the control loop triggers the input IN1 (S terminal) of the RS flip-flop via the 1-second pulse generator 001. The RS flip-flop outputs logic 1, connecting ports b and c of the third switch K2 and simultaneously connecting ports b and c of the fourth switch K4. The second digital input setter ON001 sends a logic 1 signal to the second AND gate AND002. If the transmitter signal IN1 and the actuator signal IN2 are both normal at this time, all three input ports of the second AND gate AND002 will be logic 1, and the output of the second AND gate AND002 will also be logic 1. This indicates that the automatic instruments constituting the automatic control loop can be used normally. The logic 1 output of the second AND gate AND002 is connected to the input IN5 of the first AND gate AND001. If the other four input ports of the first AND gate AND001 are all logic 1, the PID controller PI001 switches to automatic control mode. This is the adaptive process of the analog control loop.

[0063] If either IN1 or IN2, the input port of the second AND gate AND002, is 0, it indicates that there is an abnormality in the automated instrument. The second AND gate AND002 sends a logic signal 0, which is sent to the IN2 input of the first OR gate OR001 via the first NOT gate N001. The first OR gate OR001 outputs a logic signal 1, which is sent to the IN2 (R terminal) of the flip-flop RS001 via a 1-second pulse generator. The flip-flop RS001 is then set to 0, and the M / A operator returns to manual mode.

[0064] In one alternative implementation, the method further includes:

[0065] Step S7: If the transmitter signal and actuator valve position are normal, and any one of the following four conditions is not met: the regulator inlet deviation is less than the first preset value, the outlet valve is open, the equipment is running, and the system parameters are met, control the first AND gate AND001 to output 0, control the second switcher K3 to switch the port, and start the tracking function of the PID regulator.

[0066] Step S8: Control the output of the second AND gate AND002 to 1, and invert the logic 0 output of the first AND gate AND001 to trigger the PID control loop to enter the automatic servo working mode.

[0067] Specifically, if any of the inputs IN1 to IN4 of the first AND gate AND001 is not logic 1, and only the second AND gate AND002 sends logic 1 to IN5, the adaptive logic will determine the current working state as automatic servo. This indicates that although the control device has the ability to automatically adjust, and the first switch K1's a and b are closed, the third switch K2's b and c are closed, and the output of the PID controller PI001 is the output MV of the adjustment loop, the process system conditions are not yet met. The first AND gate AND001 outputs logic 0, closing the second switch K3's a and b, and the PID controller PI001 is set to tracking, ensuring that the output of the PID controller PI001 is consistent with the output of the third switch K2's b terminal, achieving synchronous tracking and bumpless switching of the adjustment loop. The logic 0 output of the first AND gate AND001 is converted to logic by the second NOT gate N002, and the third AND gate AND003 indicates that the adjustment loop is in automatic servo mode. Automatic servo mode indicates that the control device and adjustment loop are ready and waiting for the process system to start.

[0068] In one alternative implementation, the method further includes:

[0069] Step S9: When the PID control loop is in automatic servo mode, if the four conditions are met—the regulator inlet deviation is less than the first preset value, the outlet valve is open, the equipment is running, and the system parameters are satisfied—then the first AND gate AND001 outputs 1, and the PID control loop switches to automatic control mode.

[0070] Specifically, for the three input signals of the first AND gate AND001—IN2 (outlet valve open), IN3 (equipment running), and IN4 (system parameters satisfied)—all have a logic state of 1, indicating that the process system has started normal operation. For the IN1 input signal of the first AND gate AND001, a regulator inlet deviation of less than ±10% indicates that the deviation meets the regulator's requirements and the regulating loop can operate normally. Simultaneously, the output of the first AND gate AND001 sets the third AND gate AND003 to 0 through the second NOT gate N002, canceling the automatic servo operation mode.

[0071] The above control strategy simulates human observation and judgment of the operation mode of analog quantity regulation loop, and uses logic algorithm to reproduce human thinking and decision-making. It monitors the start-up process of the process equipment in real time by controlling the sequential control of switching quantities, and adaptively realizes seamless interaction between analog quantity regulation loop and automatic control of switching quantities. It autonomously corrects the deviation of the analog quantity regulator inlet, and reflects the artificial intelligence of logic algorithm to control analog quantity PID regulation.

[0072] The adaptive working mode technology of the analog PID control loop interacts closely with the digital step control. The digital step control takes the adaptive servo mode of analog control as a necessary and sufficient condition for starting the digital step control, which connects the different variables. The analog control loop monitors the step process of the digital device. Different variables randomly exchange information with each other. When the process system meets the conditions, the analog control loop will switch to automatic control, realizing the integration of different variables.

[0073] To achieve fully automated start-up and shutdown of the process system, artificial intelligence algorithms are introduced into the basic logic module, integrating diverse variables and... Figure 4 The logical architecture enables digital intelligent automatic control. By cross-referencing and integrating diverse variables into interactive control logic, and introducing artificial intelligence algorithms, it completely eliminates manual operations such as deviation elimination and manual / automatic switching before the analog quantity regulation loop is put into automatic adjustment. This eliminates safety hazards and achieves full-condition, fully automatic control at the industrial process automation system level, comprehensively improving the power plant's digital intelligent control level, enhancing operational safety, and increasing economic efficiency. Utilizing intelligent control algorithms, completely different control modes are integrated into fully automatic program control, eliminating human intervention in the logical sequence process.

[0074] like Figure 3 As shown, the present invention provides an intelligent fusion control system for dissimilar variables in a production process, comprising: a PID controller PI001, a high / low limit monitor H / L001, a first switch K1, a second switch K3, a first AND gate AND001, a ramp generator V≯001, a first constant current setter SG002, and a second constant current setter SG003.

[0075] The PID controller PI001's first input terminal receives the deviation between the process value and the setpoint, and its output terminal is connected to the first moving contact of the first switcher K1. The high / low limit monitor H / L001's input terminal receives the deviation between the process value and the setpoint, and its output terminal is connected to both the control terminal of the first switcher K1 and the control terminal of the ramp generator V≯001. The second moving contact of the first switcher K1 is connected to the output terminal of the ramp generator V≯001, and the stationary contact of the first switcher K1 is connected to the control loop. The first input terminal of the ramp generator V≯001 is connected to the first constant current setpoint SG002, and its second input terminal is connected to the second constant current setpoint SG003. The first moving contact of the second switcher K3 is connected to the second input terminal of the PID controller PI001. The second moving contact of the second switcher K3 is connected to the regulation loop. The stationary contact of the second switcher K3 is connected to both the output terminal of the PID controller PI001 and the regulation loop. The control terminal of the second switcher K3 is connected to the output terminal of the first AND gate AND001. The first input terminal of the first AND gate AND001 receives a signal indicating that the inlet deviation is less than the first preset value. The second input terminal of the first AND gate AND001 receives a signal indicating that the second outlet valve is open. The third input terminal of the first AND gate AND001 receives a signal indicating that the equipment is running. The fourth input terminal of the first AND gate AND001 receives a signal indicating that the system parameters are met. The fifth input terminal of the first AND gate AND001 receives a normal transmitter signal and a normal actuator valve position signal. The output terminal of the first AND gate AND001 outputs an automatic adjustment signal.

[0076] Specifically, the adaptive logic monitoring system checks whether the equipment in the process system has started, whether the process parameters meet the requirements, and whether the inlet deviation of the PID controller PI001 is appropriate. If the process system has started operating, but the high / low limit monitor H / L001 detects that the deviation between the process value PV and the setpoint SV is higher than ±10% of the setpoint, two trigger signals are issued. The first is to disconnect switches a and b of the first switch K1 and close switches c and b, connecting to the output of the ramp generator V≯001. This signal output controls the controlled object, such as the process value of pressure, flow rate, and liquid level, reducing the inlet deviation of the PID controller PI001. This function is the override correction of the PID control loop. The second is to trigger the ramp generator V≯001 to start working, with the target value provided by the first constant current setpoint SG002 and the slope provided by the second constant current setpoint SG003.

[0077] Furthermore, under the override correction function control, when the input deviation of the PID controller PI001 is less than ±10% of the given value, the state of the input IN1 of the first AND gate AND001 becomes logic 1. At this point, all inputs of the first AND gate AND001 are logic 1, and the output of the first AND gate AND001 is logic 1. The signal it sends disconnects a and b of the second switch K3, cuts off the tracking of the PID controller PI001, and starts the PID algorithm of the PID controller PI001. At the same time, the high and low limit monitor H / L001 closes a and b of the first switch K1, connecting the output of the PID controller PI001 to the output MV of the regulation loop, and the analog regulation loop begins closed-loop negative feedback control.

[0078] This invention provides an intelligent fusion control method for disparate variables in a production process. By simulating human observation and judgment of the operation mode of analog quantity regulation loops and using logic algorithms to reproduce human thought processes, it monitors the operating status of process equipment controlled by sequential switching quantities in real time. It adaptively achieves seamless interaction between analog quantity regulation loops and automatic switching quantity sequential control, autonomously corrects deviations at the analog quantity regulator inlet, and seamlessly connects disparate variable sequence control with different control modes. This achieves the integration of disparate variables, forming a completely new modern fully automatic control system. It eliminates obstacles to the development of digital intelligent automation applications in thermal power plants, greatly reduces the probability of human error, shortens unit start-up and shutdown times, and further improves the safety performance and economic benefits of thermal power plants.

[0079] In one alternative implementation, such as Figure 3 As shown, the system also includes: an RS flip-flop, a third switch K2, a fourth switch K4, a manual constant current setter SG001, a second AND gate AND002, a first digital quantity setter OFF001, a second digital quantity setter ON001, a first NOT gate NO01, and an OR gate OR001.

[0080] The RS trigger's set terminal is connected to the automatic button, and its output terminal is connected to the control terminals of the third switch K2 and the fourth switch K4, respectively. The first moving contact of the third switch K2 is connected to the manual constant current setter SG001, and its second moving contact is connected to the stationary contact of the first switch K1. The stationary contact of the third switch K2 is connected to the regulating circuit. The first moving contact of the fourth switch K4 is connected to the first digital setter OFF001, and its second moving contact is connected to the second digital setter ON01. The stationary contact of the fourth switch K4 is connected to the third input terminal of the second AND gate AND002. The first input terminal of the second AND gate AND002 receives the transmitter's normal signal, and its second input terminal receives the actuator's valve position normal signal. The output terminal of the second AND gate AND002 is connected to the fifth input terminal of the first AND gate AND001, and its output terminal is connected via the second input terminal of the first NOT gate AND OR gate. The first input of OR gate OR001 is connected to the manual button, and the output of OR gate OR001 is connected to the reset terminal of RS flip-flop.

[0081] Specifically, the analog PID control loop adopts an adaptive switching technology for operating modes, see... Figure 3 The adjustment circuit achieves automatic switching. The analog quantity adjustment circuit can switch from manual to automatic adjustment simply by pressing the automatic button on the M / A (manual / automatic) operation panel. The switching is automatically completed by the adaptive logic of the operating mode.

[0082] The adaptive logic first checks the quality of the automated instruments to ensure they can function properly for analog signal regulation. These instruments include transmitters for measurement and actuators for control valves and dampers. When the automatic button is pressed on the M / A control panel of the regulation loop, the signal is triggered by the 1-second pulse generator 001, which activates the input IN1 (S terminal) of the RS flip-flop. The RS flip-flop outputs logic 1, connecting ports b and c of the third switch K2 and simultaneously connecting ports b and c of the fourth switch K4. The second digital input setter ON001 sends a logic 1 signal to the second AND gate AND002. If the transmitter signal IN1 and the actuator signal IN2 are both normal, all three input ports of the second AND gate AND002 will be logic 1, and the output of the second AND gate AND002 will also be logic 1. This indicates that the automated instruments constituting the automatic regulation loop are functioning correctly. The logic 1 output of the second AND gate AND002 is connected to the input IN5 of the first AND gate AND001. If the other four input ports of the first AND gate AND001 are all logic 1, the PID controller PI001 switches to automatic regulation mode. This is the process of adaptive operation of the analog quantity regulation loop.

[0083] If either IN1 or IN2 of the second AND gate AND002 is a logic 0, it indicates that there is an abnormality in the automated instrument. The second AND gate AND002 sends a logic signal 0, which is sent to the IN2 input of the OR gate OR001 via the first NOT gate NO01. The OR gate OR001 outputs a logic 1, which is sent to the IN2 (R terminal) of the flip-flop RS001 through the 1-second pulse generator. The flip-flop RS001 is set to 0, and the M / A operator returns to manual mode.

[0084] In one alternative implementation, such as Figure 3 As shown, the system also includes a second NOT gate NO02 and a third AND gate AND003. The input of the second NOT gate NO02 is connected to the output of the first AND gate AND001, the output of the second NOT gate NO02 is connected to the first input of the third AND gate AND003, the second input of the third AND gate AND003 is connected to the output of the second AND gate AND002, and the output of the third AND gate AND003 outputs an automatic servo signal.

[0085] Specifically, if any of the inputs IN1 to IN4 of the first AND gate AND001 is not logic 1, and only the second AND gate AND002 sends logic 1 to IN5, the adaptive logic will determine the current working state as automatic servo. This means that although the control device already has the ability to automatically adjust, and the first switch K1's a and b are closed, the third switch K2's b and c are closed, and the output of the PID controller PI001 is the output MV of the adjustment loop, the process system conditions are not yet met. The first AND gate AND001 outputs logic 0, closing the second switch K3's a and b, and the PID controller PI001 is placed in tracking mode, making the output OUT of the PID controller PI001 consistent with the output of the third switch K2's b terminal, achieving synchronous tracking and bumpless switching of the adjustment loop. The logic 0 output of the first AND gate AND001 is converted to logic by the second NOT gate NO02, and the third AND gate AND003 indicates that the adjustment loop is in automatic servo mode. Automatic servo mode means that the control device and the adjustment loop are ready and waiting for the process system to start.

[0086] Furthermore, the three input signals of the first AND gate AND001—IN2 (outlet valve open), IN3 (equipment running), and IN4 (system parameters satisfied)—are all at logic 1, indicating that the process system has begun normal operation. For the IN1 input signal of the first AND gate AND001, a regulator inlet deviation less than ±10% indicates that the deviation Δ meets the regulator's requirements, and the control loop can operate normally. Therefore, with all inputs IN1 to IN5 of the PID controller PI001 at logic 1, the PID controller PI001 can switch to automatic control. Simultaneously, the output of the controller PI001, through the second NOT gate NO02, sets the third AND gate AND003 to 0, canceling the automatic servo operation mode.

[0087] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for intelligent fusion control of disparate variables in a production process, characterized in that, The method includes: When the PID control loop is in automatic mode, the high and low limit monitor is used to detect the controller inlet deviation. If the regulator inlet deviation is not less than the first preset value, the first switcher is controlled to switch the port, the PID regulator is switched to tracking mode, the override correction function is connected to the regulation loop, and the override correction function is used to reduce the regulator inlet deviation. Under the control of the override correction function, if the regulator input deviation recovers to less than the first preset value, the first AND gate output logic 1 is controlled, the second switch switches the port, the tracking function of the PID regulator is cut off, the PID algorithm function of the PID regulator is started, and the first switch switches the port again to connect the PID regulator to the regulation loop and remove the override correction function from the regulation loop. The method further includes: The RS flip-flop is set according to the automatic adjustment command, the third switch is controlled to switch the port, the PID controller is connected to the adjustment loop, and the fourth switch is controlled to switch the port, outputting logic 1 to the second AND gate. If the transmitter signal and actuator valve position are normal, the second AND gate outputs logic 1 to the first AND gate. If the regulator inlet deviation is less than the first preset value, the outlet valve is open, the equipment is running and the system parameters are met, the first AND gate outputs logic 1. At this time, the PID control loop is in automatic control mode. If the transmitter signal and / or actuator valve position are abnormal, reset the RS trigger and switch back to manual control.

2. The intelligent fusion control method for disparate variables in a production process according to claim 1, characterized in that, Integrating the override correction function into the control loop reduces the controller inlet deviation, including: The output of the ramp generator is connected to the regulation circuit, and the ramp generator is triggered to start. The target value of the ramp generator is provided by the first constant current setpoint, and the slope of the ramp generator is given by the second constant current setpoint. The ramp generator outputs an overshoot correction signal based on the target value and slope to reduce the regulator inlet deviation.

3. The intelligent fusion control method for disparate variables in a production process according to claim 1, characterized in that, The method further includes: If the transmitter signal and actuator valve position are both normal, and any one of the following four conditions is not met: the regulator inlet deviation is less than the first preset value, the outlet valve is open, the equipment is running, and the system parameters are met, then control the first AND gate to output 0, control the second switcher to switch the port, and start the tracking function of the PID regulator. The second AND gate outputs 1, which inverts the logic 0 output of the first AND gate, triggering the PID control loop to enter automatic servo mode.

4. The intelligent fusion control method for disparate variables in a production process according to claim 3, characterized in that, The method further includes: When the PID control loop is in automatic servo mode, if the four conditions are met—the regulator inlet deviation is less than the first preset value, the outlet valve is open, the equipment is running, and the system parameters are satisfied—then the first AND gate outputs 1, and the PID control loop switches to automatic control mode.

5. A smart fusion control system for disparate variables in a production process, characterized in that, The system includes: a PID controller, a high / low limit monitor, a first switch, a second switch, a first AND gate, a ramp generator, a first constant current setpoint, and a second constant current setpoint, wherein... The first input terminal of the PID controller is the deviation between the process value and the given value, and the output terminal of the PID controller is connected to the first moving contact of the first switch. The high and low limit monitor inputs the deviation between the process value and the given value, and the output of the high and low limit monitor is connected to the control terminal of the first switch and the control terminal of the ramp generator, respectively. The second moving contact of the first switch is connected to the output terminal of the ramp generator, and the stationary contact of the first switch is connected to the adjustment circuit. The first input terminal of the ramp generator is connected to the first constant current setter, and the second input terminal of the ramp generator is connected to the second constant current setter; The first moving contact of the second switch is connected to the second input terminal of the PID controller, the second moving contact of the second switch is connected to the regulation circuit, the stationary contact of the second switch is connected to the output terminal of the PID controller and the regulation circuit respectively, and the control terminal of the second switch is connected to the output terminal of the first AND gate. The first input terminal of the first AND gate is connected to the signal that the inlet deviation is less than the first preset value; the second input terminal of the first AND gate is connected to the signal that the second outlet valve is open; the third input terminal of the first AND gate is connected to the signal that the equipment is running; the fourth input terminal of the first AND gate is connected to the signal that the system parameters are met; the fifth input terminal of the first AND gate is connected to the transmitter signal normal signal and the actuator valve position normal signal; and the output terminal of the first AND gate outputs the automatic adjustment signal. The intelligent fusion control system for dissimilar variables in the production process is used to enable a computer to perform intelligent fusion control of dissimilar variables in the production process as described in any one of claims 1 to 4.

6. The intelligent fusion control system for disparate variables in the production process according to claim 5, characterized in that, The system further includes: an RS flip-flop, a third switch, a fourth switch, a manual constant current setter, a second AND gate, a first digital input setter, a second digital input setter, a first NOT gate, and an OR gate, wherein... The set terminal of the RS trigger is connected to the automatic button, and the output terminal of the RS trigger is connected to the control terminal of the third switch and the control terminal of the fourth switch respectively. The first moving contact of the third switch is connected to the manual constant current setter, the second moving contact of the third switch is connected to the stationary contact of the first switch, and the stationary contact of the third switch is connected to the adjustment circuit. The first moving contact of the fourth switch is connected to the first digital input device, the second moving contact of the fourth switch is connected to the second digital input device, and the stationary contact of the fourth switch is connected to the third input terminal of the second AND gate. The first input terminal of the second AND gate is connected to the transmitter signal normal signal, the second input terminal of the second AND gate is connected to the actuator valve position normal signal, the output terminal of the second AND gate is connected to the fifth input terminal of the first AND gate, and the output terminal of the second AND gate is connected to the second input terminal of the OR gate via the first NOT gate. The first input terminal of the OR gate is connected to a manual button, and the output terminal of the OR gate is connected to the reset terminal of the RS flip-flop.

7. The intelligent fusion control system for disparate variables in the production process according to claim 6, characterized in that, The system further includes: a second NOT gate and a third AND gate, wherein, The input terminal of the second NOT gate is connected to the output terminal of the first AND gate, the output terminal of the second NOT gate is connected to the first input terminal of the third AND gate, the second input terminal of the third AND gate is connected to the output terminal of the second AND gate, and the output terminal of the third AND gate outputs an automatic servo signal.

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