CN117991827A - Steam flow control method and system based on double-group valve - Google Patents
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Abstract
The invention relates to the technical field of valve flow control, and discloses a steam flow control method and a steam flow control system based on double groups of valves, wherein the steam flow control method comprises the following steps: analyzing the characteristic data of the double-group valve, and initializing parameters of a PID flow control algorithm according to the characteristic data; analyzing production requirements, and generating static flow control and/or dynamic flow control according to the production requirements; according to the static error signal and/or the dynamic error signal, the integral term and the differential term, calculating a compensation control signal, wherein the control signal is used for adjusting the opening of the auxiliary valve; and acquiring real-time auxiliary valve opening and real-time flow measurement values after implementing the compensation control signals, calculating to generate a re-compensation control signal, and adjusting the auxiliary valve opening to realize closed-loop control. According to the invention, when impurities or sediments appear in the steam, the auxiliary valve is automatically adjusted according to the error between the actual flow measurement value and the target value, so that accurate flow control is realized, interference of the impurities and the sediments on flow regulation is reduced, and stability and accuracy of flow regulation are improved.
Description
Technical Field
The invention relates to the technical field of valve flow control, in particular to a steam flow control method and system based on double-group valves.
Background
A double set of valves is a valve device commonly used to control steam flow. It consists of two independently operated valves, commonly referred to as a primary valve and a secondary valve; when the main valve is opened, steam is allowed to flow to target equipment or a system through the main flow channel, the auxiliary valve is used for adjusting the opening of the main valve, and the flow of the main valve can be controlled by adjusting the opening of the auxiliary valve, so that the accurate control of the steam flow is realized; the double set of valves generally has a precise regulation capacity and response speed, the working principle of which is based on the interaction between the main valve and the secondary valve, which when opened, adjusts the opening of the main valve by means of a series of mechanical or hydraulic means, such that the secondary valve opening directly affects the opening of the main valve and thus the steam flow.
However, the vapor contains impurities or deposits, and the valve vibrates during control, which affects the flow rate adjusting efficiency, stability and valve life.
Therefore, it is necessary to provide a steam flow control method and system based on double-group valves to solve the problems of the current technology that impurities or deposits contained in steam affect the adjustment efficiency and stability of flow and the service life of valves.
Disclosure of Invention
In view of the above, the invention provides a steam flow control method and a steam flow control system based on double-group valves, which aim to solve the technical problems that impurities or sediments contained in steam affect the flow regulation efficiency and stability and the service life of the valves.
In one aspect, the invention provides a steam flow control method and a steam flow control system based on double-group valves, wherein the steam flow control method comprises the following steps:
Step S1: analyzing the characteristic data of the double-group valve, and initializing parameters of a PID flow control algorithm according to the characteristic data;
Step S2: analyzing production requirements, and generating static flow control and/or dynamic flow control according to the production requirements;
Step S3: using a flow sensor or measuring equipment to measure real-time flow values of the double-group valve in real time to generate a feedback signal, embedding the feedback signal into the flow control and/or dynamic flow control in real time to compare, and calculating a static error signal and/or a dynamic error signal;
Step S4: calculating a compensation control signal according to the static error signal and/or the dynamic error signal, an integral term and a differential term by using the initialization PID flow control algorithm, wherein the control signal is used for adjusting the opening of the auxiliary valve;
step S5: and acquiring the real-time auxiliary valve opening and the real-time flow measurement value after the compensation control signal is implemented, calculating to generate a re-compensation control signal, and adjusting the auxiliary valve opening to realize closed-loop control.
Preferably, in the step S1, analyzing the feature data of the double group valve includes: collecting a flow response curve, the relation between the opening of the auxiliary valve and the flow, dynamic characteristics and vibration conditions, and analyzing to obtain steady-state errors, response speed and damping characteristics of the double-group valve;
In the step S1, initializing parameters of a PID flow control algorithm according to the feature data includes:
Presetting a proportionality coefficient Kp: selecting a proportional coefficient according to the relation between the opening of the auxiliary valve in the characteristic data and the flow, so as to control the relation between output and error;
Presetting an integral coefficient Ti: selecting an integral coefficient according to the steady-state error and the response speed in the characteristic data so as to eliminate the steady-state error;
preset differential coefficient Td: and selecting differential coefficients according to the dynamic characteristics and the vibration conditions in the characteristic data so as to improve the stability and the anti-interference capacity of the system.
Preferably, in the step S2, the analyzing the production requirement includes: evaluating production requirements and acquiring production requirement information;
in the step S2, generating static flow control and/or dynamic flow control according to the production demand information, including:
Setting a static target flow and a dynamic target flow according to the production demand information, and sequencing according to time;
The static flow control is preset with a plurality of holding unit time, each static target flow is maintained, the static target flow is intercepted according to each holding unit time in sequence, and a first static target flow and a second static target flow are generated;
The dynamic flow control is preset with a plurality of increment unit time, each dynamic target flow which is close to the increment after the static flow control is finished is intercepted according to each increment unit time in sequence, a first increment target flow and a second increment target flow are generated, an nth increment target flow is correspondingly generated, and the first increment unit time, the second increment unit time, the first increment target flow and the nth increment target flow are generated;
The dynamic flow control is preset with a plurality of reduction unit time, each dynamic target flow which is reduced and approaches after the static flow control is ended is intercepted according to each reduction unit time in sequence, a first reduction target flow and a second reduction target flow are generated, an nth reduction target flow is correspondingly generated, and the first reduction unit time, the second reduction unit time, the first reduction unit time and the nth reduction unit time are generated.
Preferably, in the step S3, a flow sensor or a measuring device is used to measure the flow of the double-group valve in real time to generate a feedback signal, the feedback signal is embedded in the flow control and/or the dynamic flow control in real time to be compared, and a static error signal and/or a dynamic error signal are calculated, which includes:
Analyzing which unit time the time point of the feedback signal belongs to, comparing, and calculating to generate a static error signal and/or a dynamic error signal, wherein the method comprises the following steps:
when the time point of the feedback signal falls into any one of the first holding unit time and the second holding unit time, directly calculating the difference value between the corresponding target flow in the holding unit time and the real-time flow value of the feedback signal, and generating the static error signal J.
Preferably, in the step S3, the analyzing unit time to which the time point of the feedback signal belongs, comparing, and calculating to generate a static error signal and/or a dynamic error signal, further includes:
when the time point of the feedback signal falls into any one of the first increment unit time and the second increment unit time, calculating a difference K between a dynamic target flow corresponding to the increment unit time and a real-time flow value of the feedback signal, presetting a first generated increment error signal H1, a second generated increment error signal H2 and a third generated increment error signal H3, wherein H1 is smaller than H2 and smaller than 0 and H3, presetting an increment correction coefficient 1 < p2 and smaller than 1.2, and determining the dynamic error signal W according to a comparison result;
When K is less than or equal to H1, selecting a dynamic error signal as a first dynamic error signal W1, correcting by using the region-increasing correction coefficient p1, and determining that the dynamic error signal is W1×p1;
When H1 is more than K and less than or equal to H2, selecting a second dynamic error signal W2 of the dynamic error signals, correcting by using the region-increasing correction coefficient p2, and determining that the dynamic error signal is W2 multiplied by p2;
when H2 is less than K and less than or equal to H3, determining a third dynamic error signal W3 of the dynamic error signals;
wherein W1 is less than W2 and less than W3.
Preferably, in the step S3, the analyzing unit time to which the time point of the feedback signal belongs, comparing, and calculating to generate a static error signal and/or a dynamic error signal, further includes:
When the time point of the feedback signal falls into any one of the first reduction unit time and the second reduction unit time, calculating a difference value R between a dynamic target flow corresponding to the reduction unit time and a real-time flow value of the feedback signal, presetting a first generation reduction zone error signal L1, a second generation reduction zone error signal L2 and a third generation reduction zone error signal L3, wherein L1 is more than 0 and less than L2 and L3, presetting a reduction zone correction coefficient 1 and less than e2 and less than 1.2, and determining the dynamic error signal W according to a comparison result;
When R is less than or equal to L1, determining the dynamic error signal as a fourth dynamic error signal W4;
When L1 is more than R and less than or equal to L2, selecting a dynamic error signal as a fifth dynamic error signal W5, correcting by using the subtraction correction coefficient e1, and determining that the dynamic error signal is W5 xe 1;
when L2 is less than R and less than or equal to L3, selecting a dynamic error signal as a sixth dynamic error signal W6, correcting by using the subtraction correction coefficient e1, and determining the dynamic error signal as W6 xe 2;
Wherein W4 is less than W5 and less than W6.
Preferably, in the step S4, using the initializing PID flow control algorithm, a compensation control signal is calculated according to the static error signal and/or the dynamic error signal, an integral term and a derivative term, including:
when assisting the static flow control, adding a proportional term, an integral term and a differential term to obtain a static compensation signal Y, wherein the static compensation signal Y is calculated by the following formula:
wherein Kp is a preset proportionality coefficient, For a preset integral coefficient, td is a preset differential coefficient,/>For the i < th > static error signal,/>Is the error signal of the last unit time.
Preferably, in the step S4, the calculating, using the initializing PID flow control algorithm, a compensation control signal according to the static error signal and/or the dynamic error signal, an integral term and a derivative term, further includes:
when the dynamic flow control is assisted, the proportional term, the integral term and the differential term are added to obtain a dynamic compensation signal Q, which is calculated by the following formula:
wherein Kp is a preset proportionality coefficient, For a preset integral coefficient, td is a preset differential coefficient,/>For the i-th dynamic error signal,/>Is the error signal of the last unit time.
In another aspect, the present invention also provides a steam flow control system based on a double set of valves, including:
the initial flow control module is used for analyzing the characteristic data of the double-group valve and initializing parameters of a PID flow control algorithm according to the characteristic data;
The information acquisition module is used for analyzing production requirements and generating static flow control and/or dynamic flow control according to the production requirements;
The analysis module is used for measuring the real-time flow value of the double-group valve in real time by using a flow sensor or measuring equipment to generate a feedback signal, and the feedback signal is embedded into the flow control and/or the dynamic flow control in real time for comparison, and a static error signal and/or a dynamic error signal are calculated;
The calculation module is used for calculating a compensation control signal according to the static error signal and/or the dynamic error signal, an integral term and a differential term by using the initialization PID flow control algorithm, wherein the control signal is used for adjusting the opening of the auxiliary valve;
The self-adaptive module acquires the real-time auxiliary valve opening and the real-time flow measurement value after the compensation control signal is implemented, calculates and generates a re-compensation control signal, and adjusts the auxiliary valve opening to realize closed-loop control.
Compared with the prior art, the invention has the beneficial effects that: initializing control parameters by analyzing characteristic data of the double-group valve and using a PID flow control algorithm to adapt to different working conditions and requirements; calculating a compensation control signal according to the static error signal and/or the dynamic error signal, an integral term and a differential term by using an initialized PID flow control algorithm, and adjusting the opening of the auxiliary valve; when impurities or sediments appear in the steam, the auxiliary valve is automatically adjusted according to the error between the actual flow measurement value and the target value to realize accurate flow control, so that the interference of the impurities and the sediments on flow adjustment is reduced, and the stability and the accuracy of the flow adjustment are improved.
And the real-time auxiliary valve opening and the real-time flow measurement value after the compensation control signal is implemented are obtained, the re-compensation control signal is calculated and generated, and the auxiliary valve opening is further adjusted, so that closed-loop control is realized.
The method and the system can improve the accuracy and the stability of steam flow control, and are suitable for industrial application requiring accurate control of steam flow.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a flow chart of a dual set valve based steam flow control method provided by an embodiment of the present invention;
FIG. 2 is a block diagram of a dual set of valves based vapor flow control system according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
The embodiment of the invention has the following action principles: when impurities or sediments appear in the steam, interference is generated to flow regulation, so that the error between the actual flow and the target flow is increased, the influence of the impurities and the sediments on the flow regulation can be reduced through real-time feedback and adjustment of a PID flow control algorithm, and the stability and the accuracy of the flow regulation are improved;
The PID flow control algorithm can timely sense the change condition of the actual flow by acquiring the flow measurement value in real time as a feedback signal. When the flow rate changes due to impurities or deposits in the steam, the PID flow control algorithm can timely detect the change through a feedback signal.
The PID flow control algorithm compares the actual flow measurement with the target flow to calculate an error signal. When impurities or deposits occur in the steam, the actual flow rate deviates from the target flow rate, resulting in an increase in the error signal. The error signal reflects the difference between the actual flow and the target flow, and provides a basis for adjusting the opening of the auxiliary valve for the PID flow control algorithm.
The PID flow control algorithm calculates the control signal from the error signal, i.e. the sub-valve opening should be adjusted. When impurities or deposits occur in the vapor, the error signal increases and the PID flow control algorithm adjusts the secondary valve opening accordingly to reduce the error signal. By automatically adjusting the opening of the auxiliary valve, the PID flow control algorithm can adapt to the change of impurities or sediments in the steam in real time, thereby reducing the interference of flow regulation.
The PID flow control algorithm is a closed-loop control system, and the error can be corrected continuously by feeding back and continuously adjusting the opening of the auxiliary valve in real time, so that the actual flow gradually approaches the target flow. When the impurities or deposits in the steam change, the PID flow control algorithm can feed back and adjust according to the error between the actual flow measurement value and the target value so as to maintain the stability and accuracy of the flow.
In summary, through real-time feedback and adjustment of the PID flow control algorithm, the opening of the sub-valve can be automatically adjusted according to the error between the actual flow measurement value and the target value, so as to realize accurate flow control. Thus, the interference of impurities or sediments in the steam to the flow regulation can be reduced, and the stability and the accuracy of the flow regulation are improved.
Referring to fig. 1, an embodiment of the present invention provides a steam flow control method and system based on double-group valves, including:
Step S1: analyzing the characteristic data of the double-group valve, and initializing parameters of a PID flow control algorithm according to the characteristic data;
Step S2: analyzing production requirements, and generating static flow control and/or dynamic flow control according to the production requirements;
Step S3: using a flow sensor or measuring equipment to measure real-time flow values of the double-group valve in real time to generate a feedback signal, embedding the feedback signal into the flow control and/or dynamic flow control in real time to compare, and calculating a static error signal and/or a dynamic error signal;
Step S4: calculating a compensation control signal according to the static error signal and/or the dynamic error signal, an integral term and a differential term by using the initialization PID flow control algorithm, wherein the control signal is used for adjusting the opening of the auxiliary valve;
step S5: and acquiring the real-time auxiliary valve opening and the real-time flow measurement value after the compensation control signal is implemented, calculating to generate a re-compensation control signal, and adjusting the auxiliary valve opening to realize closed-loop control.
In some embodiments of the present application, in the step S1, analyzing the feature data of the dual-group valve includes: collecting a flow response curve, the relation between the opening of the auxiliary valve and the flow, dynamic characteristics and vibration conditions, and analyzing to obtain steady-state errors, response speed and damping characteristics of the double-group valve;
In the step S1, initializing parameters of a PID flow control algorithm according to the feature data includes:
Presetting a proportionality coefficient Kp: selecting a proportional coefficient according to the relation between the opening of the auxiliary valve in the characteristic data and the flow, so as to control the relation between output and error;
Presetting an integral coefficient Ti: selecting an integral coefficient according to the steady-state error and the response speed in the characteristic data so as to eliminate the steady-state error;
preset differential coefficient Td: and selecting differential coefficients according to the dynamic characteristics and the vibration conditions in the characteristic data so as to improve the stability and the anti-interference capacity of the system.
In some embodiments of the present application, in the step S2, the analyzing production requirements includes: evaluating production requirements and acquiring production requirement information;
in the step S2, generating static flow control and/or dynamic flow control according to the production demand information, including:
Setting a static target flow and a dynamic target flow according to the production demand information, and sequencing according to time;
The static flow control is preset with a plurality of holding unit time, each static target flow is maintained, the static target flow is intercepted according to each holding unit time in sequence, and a first static target flow and a second static target flow are generated;
The dynamic flow control is preset with a plurality of increment unit time, each dynamic target flow which is close to the increment after the static flow control is finished is intercepted according to each increment unit time in sequence, a first increment target flow and a second increment target flow are generated, an nth increment target flow is correspondingly generated, and the first increment unit time, the second increment unit time, the first increment target flow and the nth increment target flow are generated;
The dynamic flow control is preset with a plurality of reduction unit time, each dynamic target flow which is reduced and approaches after the static flow control is ended is intercepted according to each reduction unit time in sequence, a first reduction target flow and a second reduction target flow are generated, an nth reduction target flow is correspondingly generated, and the first reduction unit time, the second reduction unit time, the first reduction unit time and the nth reduction unit time are generated.
In some embodiments of the present application, in the step S3, measuring the flow of the dual-group valve in real time using a flow sensor or a measuring device generates a feedback signal, and the feedback signal is compared with the flow control and/or dynamic flow control in real time, and a static error signal and/or a dynamic error signal are calculated, including:
Analyzing which unit time the time point of the feedback signal belongs to, comparing, and calculating to generate a static error signal and/or a dynamic error signal, wherein the method comprises the following steps:
when the time point of the feedback signal falls into any one of the first holding unit time and the second holding unit time, directly calculating the difference value between the corresponding target flow in the holding unit time and the real-time flow value of the feedback signal, and generating the static error signal J.
In some embodiments of the present application, in the step S3, analysis is performed on which unit time the time point of the feedback signal belongs to, comparison is performed, and a static error signal and/or a dynamic error signal are generated by calculation, and the method further includes:
when the time point of the feedback signal falls into any one of the first increment unit time and the second increment unit time, calculating a difference K between a dynamic target flow corresponding to the increment unit time and a real-time flow value of the feedback signal, presetting a first generated increment error signal H1, a second generated increment error signal H2 and a third generated increment error signal H3, wherein H1 is smaller than H2 and smaller than 0 and H3, presetting an increment correction coefficient 1 < p2 and smaller than 1.2, and determining the dynamic error signal W according to a comparison result;
When K is less than or equal to H1, selecting a dynamic error signal as a first dynamic error signal W1, correcting by using the region-increasing correction coefficient p1, and determining that the dynamic error signal is W1×p1;
When H1 is more than K and less than or equal to H2, selecting a second dynamic error signal W2 of the dynamic error signals, correcting by using the region-increasing correction coefficient p2, and determining that the dynamic error signal is W2 multiplied by p2;
when H2 is less than K and less than or equal to H3, determining a third dynamic error signal W3 of the dynamic error signals;
wherein W1 is less than W2 and less than W3.
Specifically, when the difference K between the dynamic target flow corresponding to the unit time of growth and the real-time flow value of the feedback signal is smaller than 0, the real-time value is higher than the dynamic target flow, that is, the real-time flow belongs to a prediction stage from less to more, and actually, the real-time flow is far higher than the later dynamic target, and the addition adjustment is needed to keep the stability of flow control.
In some embodiments of the present application, in the step S3, analysis is performed on which unit time the time point of the feedback signal belongs to, comparison is performed, and a static error signal and/or a dynamic error signal are generated by calculation, and the method further includes:
When the time point of the feedback signal falls into any one of the first reduction unit time and the second reduction unit time, calculating a difference value R between a dynamic target flow corresponding to the reduction unit time and a real-time flow value of the feedback signal, presetting a first generation reduction zone error signal L1, a second generation reduction zone error signal L2 and a third generation reduction zone error signal L3, wherein L1 is more than 0 and less than L2 and L3, presetting a reduction zone correction coefficient 1 and less than e2 and less than 1.2, and determining the dynamic error signal W according to a comparison result;
When R is less than or equal to L1, determining the dynamic error signal as a fourth dynamic error signal W4;
When L1 is more than R and less than or equal to L2, selecting a dynamic error signal as a fifth dynamic error signal W5, correcting by using the subtraction correction coefficient e1, and determining that the dynamic error signal is W5 xe 1;
when L2 is less than R and less than or equal to L3, selecting a dynamic error signal as a sixth dynamic error signal W6, correcting by using the subtraction correction coefficient e1, and determining the dynamic error signal as W6 xe 2;
Wherein W4 is less than W5 and less than W6.
Specifically, when the difference R > 0 between the dynamic target flow corresponding to the decreasing unit time and the real-time flow value of the feedback signal, the real-time value is lower than the dynamic target flow, that is, the real-time flow itself should belong to a more-to-less prediction stage, and in fact, the real-time flow is lower than the later dynamic target, the addition adjustment is needed to keep the stability of the flow control.
In some embodiments of the present application, in the step S4, using the initializing PID flow control algorithm, a compensation control signal is calculated according to the static error signal and/or the dynamic error signal, an integral term and a derivative term, including:
when assisting the static flow control, adding a proportional term, an integral term and a differential term to obtain a static compensation signal Y, wherein the static compensation signal Y is calculated by the following formula:
wherein Kp is a preset proportional coefficient, td is a preset differential coefficient, and is an ith static error signal, which is the error signal of the previous unit time.
In some embodiments of the present application, in the step S4, using the initializing PID flow control algorithm, a compensation control signal is calculated according to the static error signal and/or the dynamic error signal, an integral term and a derivative term, and further including:
when the dynamic flow control is assisted, the proportional term, the integral term and the differential term are added to obtain a dynamic compensation signal Q, which is calculated by the following formula:
wherein Kp is a preset proportional coefficient, td is a preset differential coefficient, and is an ith dynamic error signal, which is the error signal of the previous unit time.
Specifically, the specific implementation method can be selected and developed according to the design and the requirement of the system, the compensation control signal is converted into the control signal of the auxiliary valve according to the specific control system and the control mode of the auxiliary valve, the converted auxiliary valve control signal is input into a control device of the auxiliary valve, and the auxiliary valve is controlled by the control device, so that the opening of the auxiliary valve is adjusted, including but not limited to the following modes:
the compensation control signal is converted into a current signal required for the sub-valve, and a current regulator or a current amplifier can be used to control the current of the sub-valve, thereby adjusting the opening of the sub-valve.
The compensation control signal is converted into a pressure signal required for the sub-valve, and the pressure of the sub-valve can be controlled by using a pressure controller or a regulating valve, thereby adjusting the opening degree of the sub-valve.
The position sensor and the position controller may be used to control the position of the sub-valve to adjust the sub-valve opening by converting the compensation control signal into a position signal required for the sub-valve.
Referring to fig. 2, the embodiment of the invention further provides a steam flow control system based on double-group valves, which comprises:
the initial flow control module is used for analyzing the characteristic data of the double-group valve and initializing parameters of a PID flow control algorithm according to the characteristic data;
The information acquisition module is used for analyzing production requirements and generating static flow control and/or dynamic flow control according to the production requirements;
The analysis module is used for measuring the real-time flow value of the double-group valve in real time by using a flow sensor or measuring equipment to generate a feedback signal, and the feedback signal is embedded into the flow control and/or the dynamic flow control in real time for comparison, and a static error signal and/or a dynamic error signal are calculated;
The calculation module is used for calculating a compensation control signal according to the static error signal and/or the dynamic error signal, an integral term and a differential term by using the initialization PID flow control algorithm, wherein the control signal is used for adjusting the opening of the auxiliary valve;
The self-adaptive module acquires the real-time auxiliary valve opening and the real-time flow measurement value after the compensation control signal is implemented, calculates and generates a re-compensation control signal, and adjusts the auxiliary valve opening to realize closed-loop control.
Compared with the prior art, the invention has the beneficial effects that: initializing control parameters by analyzing characteristic data of the double-group valve and using a PID flow control algorithm to adapt to different working conditions and requirements; calculating a compensation control signal according to the static error signal and/or the dynamic error signal, an integral term and a differential term by using an initialized PID flow control algorithm, and adjusting the opening of the auxiliary valve; when impurities or sediments appear in the steam, the auxiliary valve is automatically adjusted according to the error between the actual flow measurement value and the target value to realize accurate flow control, so that the interference of the impurities and the sediments on flow adjustment is reduced, and the stability and the accuracy of the flow adjustment are improved.
And the real-time auxiliary valve opening and the real-time flow measurement value after the compensation control signal is implemented are obtained, the re-compensation control signal is calculated and generated, and the auxiliary valve opening is further adjusted, so that closed-loop control is realized.
The method and the system can improve the accuracy and the stability of steam flow control, and are suitable for industrial application requiring accurate control of steam flow.
It will be appreciated by those skilled in the art that embodiments of the application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable valve flow control device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable valve flow control device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable valve flow control apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable valve flow control apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (9)
1. A steam flow control method based on double-group valve, the double-group valve includes main valve and auxiliary valve, characterized by comprising:
Step S1: analyzing the characteristic data of the double-group valve, and initializing parameters of a PID flow control algorithm according to the characteristic data;
Step S2: analyzing production requirements, and generating static flow control and/or dynamic flow control according to the production requirements;
Step S3: using a flow sensor or measuring equipment to measure real-time flow values of the double-group valve in real time to generate a feedback signal, embedding the feedback signal into the flow control and/or dynamic flow control in real time to compare, and calculating a static error signal and/or a dynamic error signal;
Step S4: calculating a compensation control signal according to the static error signal and/or the dynamic error signal, an integral term and a differential term by using the initialization PID flow control algorithm, wherein the control signal is used for adjusting the opening degree of the auxiliary valve;
step S5: and acquiring the real-time auxiliary valve opening and the real-time flow measurement value after the compensation control signal is implemented, calculating to generate a re-compensation control signal, and adjusting the auxiliary valve opening to realize closed-loop control.
2. The steam flow control method based on the double group valve according to claim 1, wherein in the step S1, analyzing the feature data of the double group valve includes: collecting a flow response curve, the relation between the opening of the auxiliary valve and the flow, dynamic characteristics and vibration conditions, and analyzing to obtain steady-state errors, response speed and damping characteristics of the double-group valve;
In the step S1, initializing parameters of a PID flow control algorithm according to the feature data includes:
Presetting a proportionality coefficient Kp: selecting a proportional coefficient according to the relation between the opening of the auxiliary valve in the characteristic data and the flow, so as to control the relation between output and error;
Presetting an integral coefficient Ti: selecting an integral coefficient according to the steady-state error and the response speed in the characteristic data so as to eliminate the steady-state error;
preset differential coefficient Td: and selecting differential coefficients according to the dynamic characteristics and the vibration conditions in the characteristic data so as to improve the stability and the anti-interference capacity of the system.
3. The steam flow control method based on the double group valve according to claim 2, wherein in the step S2, the analyzing production demand includes: evaluating production requirements and acquiring production requirement information;
in the step S2, generating static flow control and/or dynamic flow control according to the production demand information, including:
Setting a static target flow and a dynamic target flow according to the production demand information, and sequencing according to time;
The static flow control is preset with a plurality of holding unit time, each static target flow is maintained, the static target flow is intercepted according to each holding unit time in sequence, and a first static target flow and a second static target flow are generated;
The dynamic flow control is preset with a plurality of increment unit time, each dynamic target flow which is close to the increment after the static flow control is finished is intercepted according to each increment unit time in sequence, a first increment target flow and a second increment target flow are generated, an nth increment target flow is correspondingly generated, and the first increment unit time, the second increment unit time, the first increment target flow and the nth increment target flow are generated;
The dynamic flow control is preset with a plurality of reduction unit time, each dynamic target flow which is reduced and approaches after the static flow control is ended is intercepted according to each reduction unit time in sequence, a first reduction target flow and a second reduction target flow are generated, an nth reduction target flow is correspondingly generated, and the first reduction unit time, the second reduction unit time, the first reduction unit time and the nth reduction unit time are generated.
4. A steam flow control method based on double group valves according to claim 3, characterized in that in step S3, a flow sensor or a measuring device is used to measure the flow of the double group valves in real time to generate a feedback signal, the feedback signal is embedded in the flow control and/or dynamic flow control in real time to be compared, and a static error signal and/or a dynamic error signal are calculated, comprising:
Analyzing which unit time the time point of the feedback signal belongs to, comparing, and calculating to generate a static error signal and/or a dynamic error signal, wherein the method comprises the following steps:
when the time point of the feedback signal falls into any one of the first holding unit time and the second holding unit time, directly calculating the difference value between the corresponding target flow in the holding unit time and the real-time flow value of the feedback signal, and generating the static error signal J.
5. The steam flow control method according to claim 4, wherein in the step S3, which unit time the time point of the feedback signal belongs to is analyzed, the comparison is performed, and the static error signal and/or the dynamic error signal are calculated and generated, and the method further comprises:
when the time point of the feedback signal falls into any one of the first increment unit time and the second increment unit time, calculating a difference K between a dynamic target flow corresponding to the increment unit time and a real-time flow value of the feedback signal, presetting a first generated increment error signal H1, a second generated increment error signal H2 and a third generated increment error signal H3, wherein H1 is smaller than H2 and smaller than 0 and H3, presetting an increment correction coefficient 1 < p2 and smaller than 1.2, and determining the dynamic error signal W according to a comparison result;
When K is less than or equal to H1, selecting a dynamic error signal as a first dynamic error signal W1, correcting by using the region-increasing correction coefficient p1, and determining that the dynamic error signal is W1×p1;
When H1 is more than K and less than or equal to H2, selecting a second dynamic error signal W2 of the dynamic error signals, correcting by using the region-increasing correction coefficient p2, and determining that the dynamic error signal is W2 multiplied by p2;
when H2 is less than K and less than or equal to H3, determining a third dynamic error signal W3 of the dynamic error signals;
wherein W1 is less than W2 and less than W3.
6. The steam flow control method according to claim 5, wherein in the step S3, which unit time the time point of the feedback signal belongs to is analyzed, the comparison is performed, and the static error signal and/or the dynamic error signal are calculated and generated, and the method further comprises:
When the time point of the feedback signal falls into any one of the first reduction unit time and the second reduction unit time, calculating a difference value R between a dynamic target flow corresponding to the reduction unit time and a real-time flow value of the feedback signal, presetting a first generation reduction zone error signal L1, a second generation reduction zone error signal L2 and a third generation reduction zone error signal L3, wherein L1 is more than 0 and less than L2 and L3, presetting a reduction zone correction coefficient 1 and less than e2 and less than 1.2, and determining the dynamic error signal W according to a comparison result;
When R is less than or equal to L1, determining the dynamic error signal as a fourth dynamic error signal W4;
When L1 is more than R and less than or equal to L2, selecting a dynamic error signal as a fifth dynamic error signal W5, correcting by using the subtraction correction coefficient e1, and determining that the dynamic error signal is W5 xe 1;
when L2 is less than R and less than or equal to L3, selecting a dynamic error signal as a sixth dynamic error signal W6, correcting by using the subtraction correction coefficient e1, and determining the dynamic error signal as W6 xe 2;
Wherein W4 is less than W5 and less than W6.
7. The steam flow control method based on the double group valve according to claim 6, wherein in the step S4, using the initializing PID flow control algorithm, a compensation control signal is calculated according to the static error signal and/or the dynamic error signal, an integral term and a differential term, comprising:
when assisting the static flow control, adding a proportional term, an integral term and a differential term to obtain a static compensation signal Y, wherein the static compensation signal Y is calculated by the following formula:
；
wherein Kp is a preset proportionality coefficient, For a preset integral coefficient, td is a preset differential coefficient,/>For the i < th > static error signal,/>Is the error signal of the last unit time.
8. The steam flow control method based on the double group valve according to claim 7, wherein in the step S4, the compensation control signal is calculated according to the static error signal and/or the dynamic error signal, the integral term and the differential term using the initializing PID flow control algorithm, and further comprising:
when the dynamic flow control is assisted, the proportional term, the integral term and the differential term are added to obtain a dynamic compensation signal Q, which is calculated by the following formula:
；
wherein Kp is a preset proportionality coefficient, For a preset integral coefficient, td is a preset differential coefficient,/>For the i-th dynamic error signal,/>Is the error signal of the last unit time.
9. A steam flow control system based on double group valve, applied to the steam flow control method based on double group valve according to any one of claims 1-8, comprising:
the initial flow control module is used for analyzing the characteristic data of the double-group valve and initializing parameters of a PID flow control algorithm according to the characteristic data;
The information acquisition module is used for analyzing production requirements and generating static flow control and/or dynamic flow control according to the production requirements;
The analysis module is used for measuring the real-time flow value of the double-group valve in real time by using a flow sensor or measuring equipment to generate a feedback signal, and the feedback signal is embedded into the flow control and/or the dynamic flow control in real time for comparison, and a static error signal and/or a dynamic error signal are calculated;
The calculation module is used for calculating a compensation control signal according to the static error signal and/or the dynamic error signal, an integral term and a differential term by using the initialization PID flow control algorithm, wherein the control signal is used for adjusting the opening of the auxiliary valve;
The self-adaptive module acquires the real-time auxiliary valve opening and the real-time flow measurement value after the compensation control signal is implemented, calculates and generates a re-compensation control signal, and adjusts the auxiliary valve opening to realize closed-loop control.
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