Production process different variable intelligent fusion control method and system

Abstract

The invention relates to the technical field of power plant production process automation, and discloses a production process different variable intelligent fusion control method and system.The control method comprises the steps that when a PID adjusting loop is in an automatic working mode, a high-low limit monitor is used for detecting the deviation of an inlet of a regulator; if the regulator inlet deviation is not less than the first preset value, controlling a first switcher to switch a port; and under the control of the override correction function, if the regulator inlet deviation recovers to be smaller than the first preset value, the first AND gate is controlled to output logic 1, the second switcher is controlled to switch the port, and meanwhile the first switcher is controlled to switch the port again. By means of an intelligent control algorithm, control modes with completely different characteristics are fused into full-automatic program control, deviation of an inlet of the analog quantity regulator is automatically corrected, and a brand-new modern whole-process automatic control system is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of power plant production process automation, and in particular to a method and system for intelligent fusion control of widely different variables in a production process. Background Art

[0002] There are many types of controlled objects in the process control of thermal power plants, such as switching quantities, analog quantities, pulse quantities, etc. The characteristics of these variables are completely different, which are called "distinct variables". There are multiple modes for controlling distinct variables, and each can be independently applied in traditional control methods.

[0003] Due to the unrelated nature of controlling "distinct variables," for example, simple on-off variables can achieve automatic sequential control. This sequential control utilizes a single domino logic with discrete variables. Analog variables are continuous, and PID control is automatic, but some controls must be performed manually before analog PID control begins. For example, to minimize the disturbances encountered when analog control is automatically activated (excessive disturbances can cause the controller to oscillate, and in severe cases, diverge and fail), the deviation Δ of the controller input must be less than a specified value, such as ±10%. This requirement must be met manually. If analog control is added to on-off sequential control, the automatic progress of the sequential control steps will be blocked, making it impossible to achieve full automatic control of the steps. Therefore, when combining on-off sequential control and analog control, with their distinct variables and different control modes, it is clear that traditional control methods simply cannot achieve full automation, yet full automation is a critically important control method for modern thermal power generators to ensure safe operation and improve economic efficiency. Summary of the Invention

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

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

[0006] When the PID control loop is in automatic working mode, the high and low limit monitors are used to detect the regulator inlet deviation;

[0007] If the regulator inlet deviation is not less than the first preset value, the first switch port is controlled to switch the PID regulator to the tracking mode, the override correction function is connected to the regulation loop, and the regulator inlet deviation is reduced by using the override correction function;

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

[0009] The present invention provides an intelligent fusion control method for different variables in the production process. By simulating human observation and judgment of the working mode of the analog regulation loop and using logical algorithms to reproduce human thinking and decision-making, it monitors the operating status of the switch sequence control process equipment in real time, allowing the different variable step controls combined in different control modes to be seamlessly connected, and independently correcting the deviation of the analog regulator input, it realizes the integration of different variables and forms a new modern full-process automatic control system.

[0010] In an optional embodiment, an override correction function is connected to the regulation loop, and the override correction function is used to reduce the regulator inlet deviation, including:

[0011] Connecting the output of the ramp generator to the regulation loop and triggering the ramp generator to start, wherein the target value of the ramp generator is provided by the first constant current setter and the slope of the ramp generator is given by the second constant current setter;

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

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

[0014] According to the automatic adjustment instruction, the RS trigger is set to the position, the switching port of the third switch is controlled, the PID regulator is connected to the adjustment loop, and the switching port of the fourth switch is controlled to output logic 1 to the second AND gate;

[0015] If the transmitter signal and the actuator valve position are normal, the second AND gate is controlled to output 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 is controlled to output logic 1. At this time, the PID control loop is in automatic adjustment mode.

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

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

[0018] If the transmitter signal and the actuator valve position are normal, 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, any of the four conditions is not met, the first AND gate is controlled to output 0, the second switch is controlled to switch the port, and the tracking function of the PID regulator is started;

[0019] The second AND gate output is controlled to be 1, the logic 0 output of the first AND gate is negated, and the PID regulation loop is triggered to enter the automatic servo working mode.

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

[0021] When the PID control loop is in automatic servo working mode, if the four conditions of 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 are met, the first AND gate is controlled to output 1, and the PID control loop is switched to automatic adjustment working mode.

[0022] In a second aspect, the present invention provides an intelligent fusion control system for different variables in a production process, the system comprising: a PID regulator, a high and low limit monitor, a first switch, a second switch, a first AND gate, a ramp generator, a first constant current setter and a second constant current setter, wherein:

[0023] The first input end of the PID regulator inputs the deviation between the process value and the given value, and the output end of the PID regulator is connected to the first moving contact of the first switch;

[0024] The input end of the high and low limit monitor inputs the deviation between the process value and the given value, and the output end of the high and low limit monitor is connected to the control end of the first switcher and the control end of the ramp generator respectively;

[0025] The second moving contact of the first switch is connected to the output end of the ramp generator, and the static contact of the first switch is connected to the regulation circuit;

[0026] The first input end of the ramp generator is connected to the first constant current setter, and the second input end 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 regulator, the second moving contact of the second switch is connected to the regulation loop, the static contact of the second switch is respectively connected to the output terminal of the PID regulator and the regulation loop, and the control terminal of the second switch is connected to the output terminal of the first AND gate;

[0028] A first input terminal of the first AND gate receives a signal indicating that an inlet deviation is less than a first preset value, a second input terminal of the first AND gate receives a signal indicating that a second outlet valve is open, a third input terminal of the first AND gate receives a signal indicating that a device is operating, a fourth input terminal of the first AND gate receives a signal indicating that system parameters have been met, a fifth input terminal of the first AND gate receives a signal indicating that a transmitter signal is normal and a signal indicating that an actuator valve position is normal, and an output terminal of the first AND gate outputs an automatic adjustment signal;

[0029] The intelligent fusion control system for different variables in the production process is used to enable a computer to execute the intelligent fusion control for different variables in the production process according to the first aspect or any corresponding embodiment thereof.

[0030] The present invention provides an intelligent fusion control system for different variables in the production process. It simulates human observation and judgment of the working mode of the analog regulation loop, and uses logical algorithms to reproduce human thinking and decision-making. It monitors the operating status of the switch sequence control process equipment in real time, allows the different variable step controls combined with different control modes to be seamlessly connected, and independently corrects the deviation of the analog regulator input, thereby realizing the integration of different variables and forming a new modern full-process automatic control system.

[0031] In an optional embodiment, the system further includes: an RS trigger, a third switch, a fourth switch, a manual constant current setter, a second AND gate, a first switch value setter, a second switch value setter, a first NOT gate, and an OR gate, wherein:

[0032] The set end of the RS trigger is connected to the automatic button, and the output end of the RS trigger is connected to the control end of the third switch and the control end 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 static contact of the first switch, and the static contact of the third switch is connected to the regulation circuit;

[0034] The first moving contact of the fourth switch is connected to the first switching value setter, the second moving contact of the fourth switch is connected to the second switching value setter, and the static contact of the fourth switch is connected to the third input terminal of the second AND gate;

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

[0036] The first input end of the OR gate is connected to the manual button, and the output end of the OR gate is connected to the reset end of the RS trigger.

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

[0038] The input end of the second NOT gate is connected to the output end of the first AND gate, the output end of the second NOT gate is connected to the first input end of the third AND gate, the second input end of the third AND gate is connected to the output end of the second AND gate, and the output end of the third AND gate outputs an automatic servo signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 This is the traditional switch / analog hybrid control principle diagram;

[0041] Figure 2 1 is a flow chart of a method for intelligent fusion control of different variables in a production process according to an embodiment of the present invention;

[0042] Figure 3 This is a logic diagram of analog regulation override correction and working mode adaptation according to an embodiment of the present invention;

[0043] Figure 4 1 is a schematic diagram of a full-process automatic control principle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0045] Traditional analog quantity regulation cannot be integrated into switch quantity sequential control. If the control of different variables is simply mixed together, it will form an automatic / manual mixed control (see Figure 1), which is not only time-consuming and labor-intensive, but also poses hidden dangers and risks of manual "misoperation" to the safe operation of the unit. There have been many accident cases in the past, ranging from economic losses to equipment damage.

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

[0047] In this embodiment, a method for intelligent fusion control of different variables in a production process is provided, which can be used in the above-mentioned thermal power plant process system. Figure 2 FIG. 1 is a flow chart of a method for intelligently integrating and controlling different variables in a production process according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0048] Step S1: When the PID control loop is in automatic working mode, the regulator inlet deviation is detected by using the high and low limit monitors.

[0049] Specifically, the analog control loop's operating mode can be switched from manual to automatic by simply pressing the Auto button on the M / A (Manual / Automatic) operation panel. The switch from manual to automatic is automatically completed by the adaptive operation mode logic. The adaptive operation mode logic first checks the quality of the automated instruments, including measurement transmitters and actuators that control valve dampers, to ensure they meet the requirements for proper analog control. When the Auto button is pressed on the control loop's M / A operation panel, a series of adaptive operation mode logic operations are performed, and the PID controller PI001 switches to automatic control mode.

[0050] The working mode adaptive logic monitors whether the equipment of the process system has been started, whether the process parameters meet the requirements, and whether the inlet deviation of the PID regulator PI001 is appropriate. For example, after the process parameters meet the requirements and the process system has started to operate, the high and low limit monitor H / L001 is used to detect whether the inlet deviation of the regulator meets the requirements, that is, to determine whether the deviation between the process value PV and the set value SV meets the requirements. Among them, analog regulation override correction and working mode adaptive logic refer to Figure 3 .

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

[0052] Specifically, if the high and low limit monitor H / L001 detects that the deviation between the process value PV and the set value SV is greater than or equal to a first preset value, two trigger signals are issued: one to connect the output of the ramp generator V≯001 to the regulation loop; the other to trigger the ramp generator V≯001 to start. The ramp generator V≯001 outputs an override correction signal based on the target value and slope, reducing the regulator input deviation. The target value of the ramp generator V≯001 is provided by the first constant current setter SG002, and the slope of the ramp generator V≯001 is set by the second constant current setter SG003.

[0053] For example, two trigger signals are sent. One is to disconnect a and b of the first switch K1, close c and b, and connect the output of the ramp generator V≯001. This signal output controls the regulated object, such as process values such as pressure, flow, and liquid level, and reduces the inlet deviation of the PID regulator PI001. This function is the "override correction" of the PID regulation loop. The second is to trigger 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 Figure 3 The first preset value is ±10% of the given value.

[0054] Step S3, under the control of the override correction function, if the regulator inlet deviation is restored to less than the first preset value, the first AND gate AND001 is controlled to output logic 1, the second switch K3 is controlled to switch the port, the tracking function of the PID regulator is cut off, and the PID algorithm function of the PID regulator is started. At the same time, the first switch K1 is controlled to switch the port again, the PID regulator is connected to the regulation loop, and the override correction function is removed from the regulation loop.

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

[0056] The analog PID loop is a traditional closed-loop negative feedback control method with inherent limitations in its regulation capabilities. Excessive deviation at the regulator input can severely degrade regulation quality, even affecting the normal operation of the regulation loop. Therefore, the process of transitioning from manual to automatic regulation in traditional PID regulation requires meticulous manual manipulation to reduce the deviation to a limit before switching to automatic regulation. This is both a characteristic and a significant drawback of analog PID regulation. The overdrive correction scheme perfectly addresses the shortcomings of analog PID regulation. A new open-loop control loop has been designed between the PID regulator PI001 and the loop M / A switching logic. It consists of a high and low limit monitor H / L001, a ramp generator V≯001, a first constant current setter SG002, and a second constant current setter 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, issuing a regulation loop deviation correction command based on the target value of the first constant current setter SG002 and the slope of the second constant current setter SG003. Open-loop control reduces the deviation between the regulation loop process value PV and the setpoint SV. When the regulator inlet deviation is less than the set value, the regulation loop adaptively switches to closed-loop negative feedback automatic regulation. The implementation of this technical solution allows the different variable step control modes combined together to smoothly complete the process system startup process, creating a new modern fully automatic control system.

[0057] The present invention provides an intelligent fusion control method for different variables in a production process. By simulating human observation and judgment of the working mode of an analog regulation loop and using a logic algorithm to reproduce human thinking and decision-making, the method monitors the operating status of switch sequence control process equipment in real time, adaptively realizes seamless interaction between the analog regulation loop and the switch sequence automatic control, autonomously corrects the deviation of the analog regulator input, and allows seamless connection of different variable step controls combined with different control modes, thus realizing the integration of different variables and forming a new modern full-process automatic control system. It eliminates the obstacles to the development of digital intelligent automation applications in thermal power plants, greatly reduces the probability of human error operations, shortens the start and shutdown time of the unit, and further improves the safety performance and economic benefits of thermal power plants.

[0058] In an optional embodiment, the method further includes:

[0059] In step S4, the RS trigger is set according to the automatic adjustment instruction, the third switch K2 is controlled to switch the port, the PID regulator is connected to the adjustment loop, and the fourth switch K4 is controlled to switch the port to output logic 1 to the second AND gate AND002.

[0060] Step S5: If the transmitter signal and the actuator valve position are normal, the second AND gate AND002 is controlled 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, the second AND gate AND002 is controlled to output logic 1. At this time, the PID control loop is in automatic adjustment working mode.

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

[0062] Specifically, when the automatic button is pressed on the control loop M / A operation panel, the signal, transmitted by the 1-second pulse generator 001, triggers the input IN1 (S) of the RS flip-flop. The RS flip-flop outputs a logic 1, connecting ports b and c of the third switch K2 and ports b and c of the fourth switch K4. The second switch setter ON001 then sends a logic 1 signal to the second AND gate AND002. If both the transmitter signal IN1 and the actuator signal IN2 are normal, all three inputs of the second AND gate AND002 are logic 1, and the output of the second AND gate AND002 is also logic 1, indicating that the automation instrumentation comprising the automatic control loop is functioning 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 inputs of the first AND gate AND001 are all logic 1, the PID controller PI001 switches to automatic control mode. This is the process of adaptive operation of the analog control loop.

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

[0064] In an optional embodiment, the method further includes:

[0065] Step S7: If the transmitter signal and the actuator valve position are normal, any 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 AND001 is controlled to output 0, the second switch K3 is controlled to switch the port, and the tracking function of the PID regulator is started;

[0066] Step S8, controlling the second AND gate AND002 to output 1, negating the logic 0 output by the first AND gate AND001, and triggering the PID regulation loop to enter the automatic servo working mode.

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

[0068] In an optional embodiment, the method further includes:

[0069] Step S9, when the PID control loop is in the automatic servo working mode, if the four conditions of 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 are all met, then the first AND gate AND001 is controlled to output 1, and the PID control loop is switched to the automatic adjustment working mode.

[0070] Specifically, the three input signals of the first AND gate AND001 (IN2: outlet valve open, IN3: equipment running, IN4: system parameters satisfied) are all logically 1, indicating that the process system is operating normally. The regulator input deviation of the first AND gate's IN1 input is less than ±10%, indicating that the deviation meets the regulator's requirements and the regulation loop is functioning properly. Simultaneously, the output of the first AND gate AND001, through the second NOT gate N002, sets the third AND gate AND003 to 0, disabling the automatic servo mode.

[0071] The above control strategy simulates human observation and judgment of the working mode of the analog regulation loop, and uses logical algorithms to reproduce human thinking and decision-making, monitors the startup process of the switch sequence control process equipment in real time, adaptively realizes the seamless interaction between the analog regulation loop and the switch sequence automatic control, and independently corrects the deviation of the analog regulator inlet, reflecting the artificial intelligence of the logic algorithm to control the analog PID regulation.

[0072] The adaptive working mode technology solution of the analog PID control loop interacts closely with the switch step control. The switch step control uses the adaptive servo mode of the analog regulation working mode as the necessary and sufficient condition for the start of the switch step control, and connects the connections between different variables. The analog control loop monitors the step process of the switch device, and different variables randomly exchange information with each other. When the process system meets the conditions, the analog control loop will switch to automatic adjustment, realizing the integration of different variables.

[0073] In order to realize the automatic start and stop of the process system, artificial intelligence algorithm is introduced into the basic logic module to integrate different variables. Figure 4 This logical architecture enables digital intelligent automatic control. Cross-referencing disparate variables, integrating interactive control logic, and introducing artificial intelligence algorithms revolutionize manual deviation elimination and manual / automatic switching before enabling automatic control in analog control loops, eliminating safety hazards and enabling full-condition, fully automatic control at the industrial process automation system level. This comprehensively elevates the power plant's digital intelligent control capabilities, enhances operational safety, and improves economic efficiency. Utilizing intelligent control algorithms, completely different control modes are integrated into fully automatic program control, eliminating human intervention during the logical sequence.

[0074] like Figure 3 As shown, the present invention provides an intelligent fusion control system for different variables in a production process, including: a PID regulator PI001, a high and 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 first input of the PID regulator PI001 receives the deviation between the process value and the setpoint, and the output of the PID regulator PI001 is connected to the first movable contact of the first switch K1. The input of the high and low limit monitor H / L001 receives the deviation between the process value and the setpoint, and the output of the high and low limit monitor H / L001 is connected to the control terminal of the first switch K1 and the control terminal of the ramp generator V≯001, respectively. The second movable contact of the first switch K1 is connected to the output of the ramp generator V≯001, and the static contact of the first switch K1 is connected to the regulation loop. The first input of the ramp generator V≯001 is connected to the first constant current setter SG002, and the second input of the ramp generator V≯001 is connected to the second constant current setter SG003. The first movable contact of the second switch K3 is connected to the second input of the PID regulator PI001. The second movable contact of the second switch K3 is connected to the regulation loop. The static contact of the second switch K3 is connected to the output of the PID regulator PI001 and the regulation loop, respectively. The control end of the second switch K3 is connected to the output of the first AND gate AND001. The first input of the first AND gate AND001 is connected to a signal indicating that the input deviation is less than a first preset value. The second input of the first AND gate AND001 is connected to a signal indicating that the second outlet valve is open. The third input of the first AND gate AND001 is connected to a signal indicating that the device is operating. The fourth input of the first AND gate AND001 is connected to a signal indicating that system parameters have been met. The fifth input of the first AND gate AND001 is connected to a normal transmitter signal and a normal actuator valve position signal. The output of the first AND gate AND001 outputs an automatic regulation signal.

[0076] Specifically, the adaptive logic monitors whether the process system's equipment has been started, whether process parameters meet requirements, and whether the input deviation of the PID regulator PI001 is appropriate. If the process system has already begun operating, but the high and low limit monitor H / L001 detects that the deviation between the process value PV and the set value SV exceeds ±10% of the set value, two trigger signals are issued. The first is to disconnect the a and b terminals of the first switch K1 and close the c and b terminals, connecting the output of the ramp generator V≯001. This signal output controls the process value of the controlled object, such as pressure, flow, or liquid level, reducing the input deviation of the PID regulator PI001. This function is the overrun correction of the PID control loop. The second triggers the ramp generator V≯001 to start operating. The target value is provided by the first constant current setter SG002, and the slope is given by the second constant current setter SG003.

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

[0078] The present invention provides an intelligent fusion control method for different variables in a production process. By simulating human observation and judgment of the working mode of an analog regulation loop and using a logic algorithm to reproduce human thinking and decision-making, the method monitors the operating status of switch sequence control process equipment in real time, adaptively realizes seamless interaction between the analog regulation loop and the switch sequence automatic control, autonomously corrects the deviation of the analog regulator input, and allows seamless connection of different variable step controls combined with different control modes, thus realizing the integration of different variables and forming a new modern full-process automatic control system. It eliminates the obstacles to the development of digital intelligent automation applications in thermal power plants, greatly reduces the probability of human error operations, shortens the start and shutdown time of the unit, and further improves the safety performance and economic benefits of thermal power plants.

[0079] In an optional embodiment, as Figure 3 As shown, the system also includes: an RS trigger, a third switch K2, a fourth switch K4, a manual constant current setter SG001, a second AND gate AND002, a first switch value setter OFF001, a second switch value setter ON001, a first NOT gate NO01, and an OR gate OR001.

[0080] The set terminal of the RS flip-flop is connected to the automatic switch, and the output terminals of the RS flip-flop are connected to the control terminals of the third switch K2 and the fourth switch K4, respectively. The first movable contact of the third switch K2 is connected to the manual constant current setter SG001, and the second movable contact of the third switch K2 is connected to the static contact of the first switch K1. The static contact of the third switch K2 is connected to the regulation circuit. The first movable contact of the fourth switch K4 is connected to the first switch value setter OFF001, and the second movable contact of the fourth switch K4 is connected to the second switch value setter ON01. The static 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 is connected to the transmitter signal normal signal, and the second input terminal of the second AND gate AND002 is connected to the actuator 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. The output terminal of the second AND gate AND002 is connected to the second input terminal of the OR gate via the first NOT gate. A first input terminal of the OR gate OR001 is connected to the manual button, and an output terminal of the OR gate OR001 is connected to the reset terminal of the RS trigger.

[0081] Specifically, the analog PID control loop adopts the working mode adaptive conversion technology solution, see Figure 3 The analog regulation loop can be switched from manual to automatic mode by simply pressing the automatic key on the M / A (manual / automatic) operation panel. The switch from manual to automatic is then automatically completed by the adaptive logic of the working mode.

[0082] The adaptive operating mode logic first checks the quality of the automated instruments to see if they meet the requirements for normal analog control. These automated instruments include measurement transmitters and actuators for controlling valve dampers. When the automatic button is pressed on the control loop M / A operation panel, the signal, via the 1-second pulse generator 001, triggers the RS flip-flop input IN1 (terminal S). The RS flip-flop outputs a logic 1, connecting ports b and c of the third switch K2 and ports b and c of the fourth switch K4. The second switch setter ON001 then sends a logic 1 signal to the second AND gate AND002. If both the transmitter signal IN1 and the actuator signal IN2 are normal, all three inputs of the second AND gate AND002 are logic 1, and the output of the second AND gate AND002 is also logic 1, indicating that the automated instruments that constitute the automatic control loop are functioning 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 inputs of the first AND gate AND001 are all logic 1, the PID controller PI001 switches to automatic control mode. This is the process of adapting the working mode of the analog control loop.

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

[0084] In an optional embodiment, as Figure 3 As shown, the system further includes: a second NOT gate NO02 and a third AND gate AND003. The input end of the second NOT gate NO02 is connected to the output end of the first AND gate AND001, the output end of the second NOT gate NO02 is connected to the first input end of the third AND gate AND003, the second input end of the third AND gate AND003 is connected to the output end of the second AND gate AND002, and the output end of the third AND gate AND003 outputs the automatic servo signal.

[0085] Specifically, if any of the inputs IN1-IN4 of the first AND gate AND001 is not a logic 1, and only the second AND gate AND002 sends a logic 1 to IN5, the operating mode adaptive logic will determine that the current operating state is automatic servo. This indicates that although the control device has the ability to automatically adjust, and the a and b of the first switch K1 are closed, the b and c of the third switch K2 are closed, and the output of the PID regulator PI001 is the output MV of the control loop, the process system conditions are not yet met. The first AND gate AND001 outputs a logic 0, closing the a and b of the second switch K3, and the PID regulator PI001 is placed in tracking mode, so that the output OUT of the PID regulator PI001 is consistent with the output of the b terminal of the third switch K2, achieving synchronous tracking and bumpless switching of the control loop. The logic 0 output of the first AND gate AND001 is converted to a logic 0 by the second NOT gate NO02, and the third AND gate AND003 signals that the control loop is in automatic servo mode. The automatic servo mode indicates that the control device and the control 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 operating, IN4: system parameters satisfied) are all logically 1, indicating that the process system has begun normal operation. The regulator input deviation of the first AND gate AND001's IN1 input is less than ±10%, indicating that the deviation Δ meets the regulator's requirements and the regulation loop is functioning properly. Then, the inputs IN1 to IN5 of the PID regulator PI001 are all logical 1, allowing the PID regulator PI001 to switch to automatic regulation. Simultaneously, the output of the regulator PI001, through the second NOT gate NO02, sets the third AND gate AND003 to 0, canceling the automatic servo mode.

[0087] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for intelligent fusion control of different variables in a production process, characterized by: The method comprises: When the PID control loop is in automatic working mode, the high and low limit monitors are used to detect the regulator inlet deviation; If the regulator inlet deviation is not less than the first preset value, the first switch port is controlled to switch the PID regulator to the tracking mode, the override correction function is connected to the regulation loop, and the regulator inlet deviation is reduced by using the override correction function; Under the control of the override correction function, if the regulator inlet deviation recovers to less than the first preset value, the first AND gate is controlled to output logic 1, the second switch is controlled to switch the port, the tracking function of the PID regulator is cut off, and the PID algorithm function of the PID regulator is started. At the same time, the first switch is controlled to switch the port again, the PID regulator is connected to the regulation loop, and the override correction function is removed from the regulation loop.

2. The intelligent fusion control method for different variables in a production process according to claim 1 is characterized in that: Connect the override correction function to the regulation loop and use it to reduce the regulator inlet deviation, including: Connecting the output of the ramp generator to the regulation loop and triggering the ramp generator to start, wherein the target value of the ramp generator is provided by the first constant current setter and the slope of the ramp generator is given by the second constant current setter; The ramp generator outputs an overrun correction signal according to the target value and the slope to reduce the regulator inlet deviation.

3. The intelligent fusion control method for different variables in a production process according to claim 1 is characterized in that: The method further comprises: According to the automatic adjustment instruction, the RS trigger is set to the position, the switching port of the third switch is controlled, the PID regulator is connected to the adjustment loop, and the switching port of the fourth switch is controlled to output logic 1 to the second AND gate; If the transmitter signal and the actuator valve position are normal, the second AND gate is controlled to output 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 is controlled to output logic 1. At this time, the PID control loop is in automatic adjustment mode. If the transmitter signal and / or actuator valve position is abnormal, reset the RS trigger and switch back to manual control.

4. The intelligent fusion control method for different variables in a production process according to claim 3 is characterized in that: The method further comprises: If the transmitter signal and the actuator valve position are normal, 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, and any of the four conditions is not met, the first AND gate is controlled to output 0, the second switch is controlled to switch the port, and the tracking function of the PID regulator is started; The second AND gate output is controlled to be 1, the logic 0 output of the first AND gate is negated, and the PID regulation loop is triggered to enter the automatic servo working mode.

5. The intelligent fusion control method for different variables in a production process according to claim 4 is characterized in that: The method further comprises: When the PID control loop is in automatic servo working mode, if the four conditions of 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 are met, the first AND gate is controlled to output 1, and the PID control loop is switched to automatic adjustment working mode.

6. An intelligent fusion control system for different variables in a production process, characterized by: The system includes: a PID regulator, a high and low limit monitor, a first switch, a second switch, a first AND gate, a ramp generator, a first constant current setter and a second constant current setter, wherein: The first input end of the PID regulator inputs the deviation between the process value and the given value, and the output end of the PID regulator is connected to the first moving contact of the first switch; The input end of the high and low limit monitor inputs the deviation between the process value and the given value, and the output end of the high and low limit monitor is connected to the control end of the first switcher and the control end of the ramp generator respectively; The second moving contact of the first switch is connected to the output end of the ramp generator, and the static contact of the first switch is connected to the regulation circuit; The first input end of the ramp generator is connected to the first constant current setter, and the second input end 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 regulator, the second moving contact of the second switch is connected to the regulation loop, the static contact of the second switch is respectively connected to the output terminal of the PID regulator and the regulation loop, and the control terminal of the second switch is connected to the output terminal of the first AND gate; A first input terminal of the first AND gate receives a signal indicating that an inlet deviation is less than a first preset value, a second input terminal of the first AND gate receives a signal indicating that a second outlet valve is open, a third input terminal of the first AND gate receives a signal indicating that a device is operating, a fourth input terminal of the first AND gate receives a signal indicating that system parameters have been met, a fifth input terminal of the first AND gate receives a signal indicating that a transmitter signal is normal and a signal indicating that an actuator valve position is normal, and an output terminal of the first AND gate outputs an automatic adjustment signal; The intelligent fusion control system for different variables in the production process is used to enable a computer to execute the intelligent fusion control for different variables in the production process as described in any one of claims 1 to 5.

7. The intelligent fusion control system for different production process variables according to claim 6 is characterized in that: The system further includes: an RS trigger, a third switch, a fourth switch, a manual constant current setter, a second AND gate, a first switch value setter, a second switch value setter, a first NOT gate, and an OR gate, wherein: The set end of the RS trigger is connected to the automatic button, and the output end of the RS trigger is connected to the control end of the third switch and the control end 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 static contact of the first switch, and the static contact of the third switch is connected to the regulation circuit; The first moving contact of the fourth switch is connected to the first switching value setter, the second moving contact of the fourth switch is connected to the second switching value setter, and the static contact of the fourth switch is connected to the third input terminal of the second AND gate; The first input end of the second AND gate is connected to the transmitter signal normal signal, the second input end of the second AND gate is connected to the actuator valve position normal signal, the output end of the second AND gate is connected to the fifth input end of the first AND gate, and the output end of the second AND gate is connected to the second input end of the OR gate via the first NOT gate; The first input end of the OR gate is connected to the manual button, and the output end of the OR gate is connected to the reset end of the RS trigger.

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

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