CN117742263A - Analog quantity control method and related device based on distributed control system - Google Patents
Analog quantity control method and related device based on distributed control system Download PDFInfo
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Abstract
The application discloses an analog quantity control method based on a distributed control system, which can be used in the field of automatic control and comprises the following steps: acquiring a plurality of analog quantity control intervals, analog quantity values, analog quantity change rates and analog quantity change trend inflection points; determining an analog quantity regulating valve control rule based on the analog quantity value at the zero moment; and controlling the opening of the analog quantity regulating valve based on the analog quantity regulating valve control rule, the analog quantity control interval in which the current analog quantity value is positioned, the analog quantity change rate and the analog quantity change trend inflection point. Therefore, by dividing a plurality of analog quantity control intervals and configuring different analog quantity regulating valve openings for the combination of different analog quantity change rates and analog quantity change trend inflection points in each analog quantity control interval, the regulating requirements of analog quantity values under different conditions can be more accurately met, the control precision, the control efficiency and the control stability of analog quantity are improved, and the stability of product quality is further improved.
Description
Technical Field
The application relates to the technical field of automatic control, in particular to an analog quantity control method based on a distributed control system and a related device.
Background
With the development of industrial automation, distributed control systems (Distributed Control System, DCS) are widely used for controlling and monitoring analog quantities in various processes.
Currently, feedback control mechanisms such as PID control methods are commonly applied in DCS systems to control and detect analog quantities. However, variations in analog quantities such as temperature, pressure, flow, etc. often have complex nonlinear characteristics, and the control effect of the feedback control mechanism is often not satisfactory. In addition, due to the hysteresis effect of the DCS system on the variation response of the analog quantity, even if an advanced model prediction control strategy is adopted, the important analog quantity is difficult to control accurately, so that the stability and the efficiency of production are affected, and the product quality is further affected.
Therefore, how to control the analog quantity more accurately through the DCS system becomes a problem to be solved.
Disclosure of Invention
Based on the problems, the application provides an analog quantity control method based on a distributed control system and a related device, and the analog quantity can be controlled more accurately through a DCS system.
The embodiment of the application discloses the following technical scheme:
in a first aspect, an embodiment of the present application provides an analog quantity control method based on a distributed control system, where the method includes:
acquiring a plurality of analog quantity control intervals, analog quantity values, analog quantity change rates and analog quantity change trend inflection points;
determining an analog quantity regulating valve control rule based on the analog quantity value at the zero moment; the analog quantity regulating valve control rules comprise corresponding relations between analog quantity change rates, analog quantity change trend inflection points and analog quantity regulating valve opening in different analog quantity control intervals;
and controlling the opening of the analog quantity regulating valve based on the analog quantity regulating valve control rule, the analog quantity control interval in which the current analog quantity value is positioned, the analog quantity change rate and the analog quantity change trend inflection point.
Optionally, the plurality of analog quantity control sections include:
an outer positive buffer zone, a target control zone, a negative buffer zone and an outer negative buffer zone; the minimum value of the outer positive buffer is greater than the maximum value of the positive buffer; the minimum value of the positive buffer area is larger than the maximum value of the target control area; the minimum value of the target control area is larger than the maximum value of the negative buffer area; the minimum value of the negative buffer is greater than the maximum value of the outer negative buffer.
Optionally, the determining the analog quantity adjusting valve control rule based on the analog quantity control interval in which the analog quantity value is located and the analog quantity change rate includes:
if the analog value at the zero moment is smaller than the target control value, determining that the analog regulating valve control rule is a first control rule; the target control value is the median value of the target control area;
and if the analog value at the zero moment is larger than the target control value, determining the control rule of the analog quantity regulating valve as a second control rule.
Optionally, if the analog value at the zero time is smaller than the target control value, controlling the opening of the analog regulating valve based on the analog regulating valve control rule, the analog control interval in which the current analog value is located, the analog change rate and the analog change trend inflection point includes:
if the current analog value is in the external negative buffer area, the negative buffer area or the target control area, controlling the opening of the first regulating valve based on the analog control area, the analog change rate and the analog change trend inflection point where the current analog value is; the first regulating valve is used for increasing the analog value;
if the current analog value is in the external positive buffer area or the positive buffer area, controlling the opening of the second regulating valve based on the analog control interval in which the current analog value is, the analog change rate and the analog change trend inflection point; the second regulating valve is used for reducing the analog quantity value.
Optionally, if the current analog value is in the external negative buffer zone, the opening of the first regulating valve is selected from 20% -80%;
if the current analog value is in the negative buffer area or the target control area, the opening of the first regulating valve is selected from 0-10%;
if the current analog value is in the positive buffer area or the external positive buffer area, the first regulating valve is closed, the second regulating valve is opened, and the opening of the second regulating valve is selected from 0% -20%.
Optionally, if the analog value at the zero time is greater than the target control value, controlling the opening of the analog regulating valve based on the analog regulating valve control rule, the analog control interval in which the current analog value is located, the analog change rate and the analog change trend inflection point includes:
if the current analog value is in the external negative buffer area or the negative buffer area, controlling the opening of the first regulating valve based on the analog control interval in which the current analog value is, the analog change rate and the analog change trend inflection point;
and if the current analog value is in the external positive buffer area, the positive buffer area or the target control area, controlling the opening of the second regulating valve based on the analog control area, the analog change rate and the analog change trend inflection point where the current analog value is.
Optionally, if the current analog value is in the external positive buffer area, the opening of the second regulating valve is selected from 20% -80%;
if the current analog value is in the target control area or the positive buffer area, the opening of the second regulating valve is selected from 0-10%;
if the current analog value is in the external negative buffer zone or the negative buffer zone, closing the second regulating valve, and opening the first regulating valve, wherein the opening of the first regulating valve is selected from 0% -20%.
In a second aspect, an embodiment of the present application provides an analog quantity control device based on a distributed control system, where the device includes: the system comprises an acquisition module, a determination module and a control module;
the acquisition module is used for acquiring a plurality of analog quantity control intervals, analog quantity values, analog quantity change rates and analog quantity change trend inflection points;
the determining module is used for determining an analog quantity regulating valve control rule based on the analog quantity value at the zero moment; the analog quantity regulating valve control rules comprise corresponding relations between analog quantity change rates, analog quantity change trend inflection points and analog quantity regulating valve opening in different analog quantity control intervals;
the control module is used for controlling the opening of the analog quantity regulating valve based on the analog quantity regulating valve control rule, the analog quantity control interval where the current analog quantity value is located, the analog quantity change rate and the analog quantity change trend inflection point.
In a third aspect, embodiments of the present application provide a controller applied to a distributed control system, the controller including: a memory and a processor;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the steps of the analog quantity control method based on the distributed control system according to any one of the first aspect according to the program code.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium having a computer program stored therein, the controller applied to a distributed control system performing the steps of the distributed control system-based analog quantity control method according to any one of the first aspects when the computer program is run on the controller applied to the distributed control system.
Compared with the prior art, the application has the following beneficial effects:
the embodiment of the application provides an analog quantity control method based on a distributed control system, which comprises the following steps: acquiring a plurality of analog quantity control intervals, analog quantity values, analog quantity change rates and analog quantity change trend inflection points; determining an analog quantity regulating valve control rule based on the analog quantity value at the zero moment; the analog quantity regulating valve control rules comprise corresponding relations between analog quantity change rates, analog quantity change trend inflection points and analog quantity regulating valve opening in different analog quantity control intervals; and controlling the opening of the analog quantity regulating valve based on the analog quantity regulating valve control rule, the analog quantity control interval in which the current analog quantity value is positioned, the analog quantity change rate and the analog quantity change trend inflection point. Therefore, by dividing a plurality of analog quantity control intervals and configuring different analog quantity regulating valve openings for the combination of different analog quantity change rates and analog quantity change trend inflection points in each analog quantity control interval, the regulating requirements of analog quantity values under different conditions can be more accurately met, the control precision, the control efficiency and the control stability of analog quantity are improved, and the stability of product quality is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an analog quantity control method based on a distributed control system according to an embodiment of the present application;
fig. 2 is a schematic diagram of dividing an analog control interval according to an embodiment of the present application;
fig. 3 is a schematic diagram of a first control rule provided in an embodiment of the present application;
fig. 4 is a schematic diagram of a second control rule provided in an embodiment of the present application;
fig. 5 is a schematic diagram of an analog quantity control device based on a distributed control system according to an embodiment of the present application;
fig. 6 is a structural diagram of a controller applied to a distributed control system according to an embodiment of the present application.
Detailed Description
The analog quantity control method and the related device based on the distributed control system provided by the application can be used in the field of automatic control, and the analog quantity control method and the related device based on the distributed control system provided by the application are not limited by the above example.
The terms "first," "second," "third," and "fourth" and the like in the description and in the claims and drawings are used for distinguishing between different objects and not for limiting a particular order.
In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "by way of example" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "by way of example" or "such as" is intended to present related concepts in a concrete fashion.
The terminology used in the description section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, the chart is a flow chart of an analog quantity control method based on a distributed control system according to an embodiment of the present application, where the method includes:
s101: and acquiring a plurality of analog quantity control intervals, analog quantity values, analog quantity change rates and analog quantity change trend inflection points.
The analog quantity is illustratively a continuously varying quantity or signal in the DCS system, for example, a process parameter such as temperature, pressure or flow, or a custom variable in the DCS system to assist in control, etc. The analog value can be obtained by monitoring the field working condition through the DCS system. The analog quantity change rate is a value that simulates a change in the magnitude per unit time, and may be, for example, a value that changes the analog magnitude within one minute. The analog quantity change trend inflection point is a trend point at which the change trend of the analog quantity value changes from increasing to decreasing or from decreasing to increasing.
Optionally, referring to fig. 2, this is a schematic diagram of dividing an analog control interval provided in an embodiment of the present application, where a plurality of analog control intervals may include: an outer positive buffer, a target control region, a negative buffer, and an outer negative buffer.
Wherein the minimum value of the outer positive buffer is greater than the maximum value of the positive buffer; the minimum value of the positive buffer area is larger than the maximum value of the target control area; the minimum value of the target control area is larger than the maximum value of the negative buffer area; the minimum value of the negative buffer is greater than the maximum value of the outer negative buffer.
As an example of this, the number of devices, the interval of the external positive buffer is [ SV+PC, + ] infinity; the interval of the positive buffer is (SV+JD, SV+PC); the target control area is [ SV-JD, SV+JD ]; the negative buffer is (SV-PC, SV-JD); the outer negative buffer is (-), SV-PC ] whereinSV is the target control value, i.e., the median of the target control area, PC is the allowable deviation of analog quantity, JD is the accuracy of analog quantity, and AI is the analog quantity.
S102: based on the analog quantity value at the zero time, an analog quantity regulating valve control rule is determined.
Illustratively, the analog value at zero time may be an analog value monitored by the DCS system at the beginning of the production process, or an analog value monitored by the DCS system at the beginning of the preset calibration period, or an analog value monitored by the DCS system at the set monitoring start time, etc.
Optionally, the analog quantity adjusting valve control rule includes a first control rule and a second control rule; comparing the analog value at the zero time with the target control value, and if the analog value at the zero time is smaller than the target control value, determining the control rule of the analog quantity regulating valve as a first control rule; and if the analog value at the zero moment is larger than the target control value, determining the control rule of the analog quantity regulating valve as a second control rule. Therefore, the control rule of the applied analog quantity regulating valve is determined based on the magnitude relation between the analog quantity value at zero time and the target control value, the analog quantity gradually approaches the target control value through the control rule of the proper analog quantity regulating valve, and the analog quantity value is easier to be finally controlled in the target control area, so that a more ideal control state is achieved.
S103: and controlling the opening of the analog quantity regulating valve based on the analog quantity regulating valve control rule, the analog quantity control interval in which the current analog quantity value is positioned, the analog quantity change rate and the analog quantity change trend inflection point.
The analog quantity adjusting valve control rules include, for example, the analog quantity change rate and the correspondence between the analog quantity change trend inflection point and the analog quantity adjusting valve opening in different analog quantity control sections. For example, in the first control rule, if the analog value is in the negative buffer region and the analog change rate BHL is less than or equal to 0.05, the corresponding analog regulating valve opening is 10% of the first regulating valve opening; the opening of the first regulating valve is used for increasing the analog value, and the larger the opening of the first regulating valve is, the faster the analog value increasing rate is.
Alternatively, control periods may be preset, each of which controls the opening degree of the analog quantity adjusting valve once based on the analog quantity adjusting valve control rule, the analog quantity control section in which the current analog quantity value is located, the analog quantity change rate, and the analog quantity change trend inflection point. For example, the control period may be 500ms.
Therefore, in the embodiment of the application, the plurality of analog quantity control intervals are divided, and different analog quantity adjusting valve openings are configured for the combination of different analog quantity change rates and analog quantity change trend inflection points in each analog quantity control interval, so that the adjusting requirements of analog quantity values under different conditions can be more accurately met, the control precision, the control efficiency and the control stability of the analog quantity are improved, and the stability of the product quality is further improved.
In other embodiments provided herein, when the first control rule is applied, if the current analog quantity value is in the external negative buffer area, the negative buffer area or the target control area, controlling the opening of the first regulating valve based on the analog quantity control area, the analog quantity change rate and the analog quantity change trend inflection point where the current analog quantity value is located; and if the current analog quantity value is in the external positive buffer area or the positive buffer area, controlling the opening of the second regulating valve based on the analog quantity control interval, the analog quantity change rate and the analog quantity change trend inflection point where the current analog quantity value is. Wherein the first regulating valve is used for raising the analog value; the second regulating valve is used for reducing the analog quantity value.
Optionally, in the first control rule, if the current analog value is in the external negative buffer zone, the opening of the first regulating valve is selected from 20% -80%; if the current analog value is in the negative buffer area or the target control area, the opening of the first regulating valve is selected from 0-10%; if the current analog value is in the positive buffer area or the external positive buffer area, the first regulating valve is closed, the second regulating valve is opened, and the opening of the second regulating valve is selected from 0% -20%.
Referring to fig. 3, the first control rule schematic is provided in an embodiment of the present application.
The first control rule is suitable for the situation that the value of the zero moment of the controlled analog quantity is smaller than the target control value SV, and the analog quantity in the outer negative buffer zone can pass through the outer negative buffer zone, the negative buffer zone and the target control zone in sequence by applying the first control rule, and finally stays in the target control zone to achieve a more ideal control state.
Illustratively, the first control rule may include 13 logical sequence numbers, as follows:
if the current analog quantity value is in the external negative buffer zone and the analog quantity change rate BHL is smaller than 1.0, executing the logic sequence number 13, opening the first regulating valve to raise the analog quantity value, wherein the set value of the opening of the first regulating valve can be selected from 40% -80%, so that the analog quantity value with larger deviation from the target control value can be more quickly approached to the target control value.
And if the current analog quantity value is in the external negative buffer zone and the analog quantity change rate BHL is greater than or equal to 1.0, executing the logic sequence number 12, and controlling the first regulating valve to reduce the opening. At this time, the analog quantity change rate is large, and the rising speed is too fast, so the opening of the first regulating valve can be reduced in advance, thereby reducing the analog quantity change rate, so that the analog quantity value is more gradually approaching to the target control value, and the situations that the analog quantity value caused by over regulation cannot stay in the target control region and pass through the positive buffer region and even the external positive buffer region are reduced, for example, the set value of the opening of the first regulating valve can be selected from 20% -40%.
If the current analog quantity value is in the negative buffer area and the analog quantity change rate BHL is smaller than or equal to 0.05, executing a logic sequence number 11, and controlling the opening of the first regulating valve to be 10%. At this time, the analog quantity change rate is small, but in the deviation range, the analog quantity change rate may be controlled within the interval range of (0.05,0.5) by using the slightly larger opening of the first regulating valve, so that the analog quantity value may continue to approach the target control value.
If the current analog quantity value is in the negative buffer area and the analog quantity change rate BHL is in the range of (0.05,0.5), the logic sequence number 10 is executed, and the opening of the first regulating valve is controlled to be 5%. At this time, the analog quantity change rate can meet the requirement of enabling the analog quantity value to approach the target control value smoothly and rapidly, so that the opening of the first regulating valve can be set to be 5% so as to maintain the current analog quantity change rate as much as possible.
If the current analog quantity value is in the negative buffer area and the analog quantity change rate BHL is greater than or equal to 0.1, executing a logic sequence number 9, and controlling the opening of the first regulating valve to be 0%. At this time, the analog value is relatively close to the target control value, and when the BHL is greater than or equal to 0.1, there is a risk of excessive adjustment, so that the opening of the first adjusting valve can be further reduced, and even the first adjusting valve is closed, that is, the opening of the first adjusting valve is controlled to be 0%.
If the current analog quantity value is in the target control area and the analog quantity change rate BHL is greater than or equal to 0.5, executing a logic sequence number 8, and controlling the opening of the first regulating valve to be 0%. If the current analog quantity value is already in the target control area, the analog quantity value and the target control value are already very close, the difference between the two values may be affected by the measurement accuracy, and it is required to maintain the current analog quantity value at this time, preferably, the BHL may be maintained in the interval of [ -0.1,0.1] as the target, and if the BHL is greater than or equal to 0.5, the first regulating valve needs to be closed in advance, so as to slow down the rising trend of the analog quantity value.
If the current analog quantity value is in the target control area, the analog quantity change rate BHL is in the interval of [ -0.1,0.1], and the analog quantity change trend inflection point DD is smaller than 0, executing the logic sequence number 7, and controlling the first regulating valve, wherein the opening of the first regulating valve can be selected from 3% -5%. At this time, the trend of the analog quantity value is changed from rising to falling, so it is necessary to increase the opening of the first regulating valve in advance to maintain the analog quantity value within the target control region.
If the current analog quantity value is in the target control area, the analog quantity change rate BHL is in the interval of [ -0.1,0.1], and the analog quantity change trend inflection point DD is greater than 0, executing the logic sequence number 6, and controlling the opening of the first regulating valve to be 0%. At this time, the trend of the analog quantity value is changed from descending to ascending, so that the opening degree of the first regulating valve needs to be reduced in advance to maintain the analog quantity value within the target control area.
And if the current analog quantity value is in the target control area and the analog quantity change rate BHL is smaller than-0.1, executing the logic sequence number 5, and controlling the opening of the first regulating valve to be 10%. When BHL is smaller than-0.1, the descending trend of the analog value is faster, and the opening degree of the first regulating valve needs to be increased in advance to maintain the analog value in the target control area.
If the current analog value is in the positive buffer area, the analog change rate BHL is greater than 0.01, and the analog change trend inflection point DD is greater than 0, executing the logic sequence number 4, closing the first regulating valve, opening the second regulating valve, wherein the opening of the second regulating valve can be selected from 0% -5%. At this time, the analog value rises to the positive buffer and the rising speed is fast, and the second regulator valve needs to be opened to reduce the analog value.
If the current analog quantity value is in the positive buffer area, the analog quantity change rate BHL is greater than or equal to-0.05, and the analog quantity change trend inflection point DD is smaller than 0, executing the logic sequence number 3, and closing the first regulating valve and the second regulating valve. At this time, the change trend of the analog quantity value is changed from rising to falling, and the analog quantity regulating valve can be closed in advance.
And if the current analog quantity value is in the external positive buffer zone and the analog quantity variation trend inflection point DD is smaller than 0, executing the logic sequence number 2, and closing the first regulating valve and the second regulating valve. At this time, the change trend of the analog quantity value is changed from rising to falling, and the analog quantity regulating valve can be closed in advance.
If the current analog value is in the external positive buffer zone and the analog change trend inflection point DD does not appear, executing the logic sequence number 1, and controlling the second regulating valve, wherein the opening of the second regulating valve can be selected from 5% -15%. At this point, the analog quantity value is already outside the prescribed deviation, and it is necessary to reduce the analog quantity value by the second regulator valve.
It is understood that the above setting of the analog quantity change rate BHL and the analog quantity adjusting valve opening are only examples, and those skilled in the art can flexibly set according to actual needs.
In other embodiments provided herein, when the second control rule is applied, if the current analog quantity value is in the external negative buffer area or the negative buffer area, controlling the opening of the first regulating valve based on the analog quantity control area, the analog quantity change rate and the analog quantity change trend inflection point where the current analog quantity value is located; and if the current analog quantity value is in the external positive buffer area, the positive buffer area or the target control area, controlling the opening of the second regulating valve based on the analog quantity control area, the analog quantity change rate and the analog quantity change trend inflection point where the current analog quantity value is.
Optionally, in the second control rule, if the current analog value is in the external positive buffer area, the opening of the second regulating valve is selected from 20% -80%; if the current analog value is in the target control area or the positive buffer area, the opening of the second regulating valve is selected from 0-10%; if the current analog value is in the external negative buffer area or the negative buffer area, the second regulating valve is closed, the first regulating valve is opened, and the opening of the first regulating valve is selected from 0% -20%.
Referring to fig. 4, a schematic diagram of a second control rule provided in an embodiment of the present application is shown.
The second control rule is suitable for the situation that the value of the zero moment of the controlled analog quantity is larger than the target control value SV, and the analog quantity in the outer positive buffer zone can pass through the outer positive buffer zone, the positive buffer zone and the target control zone in sequence by applying the second control rule, and finally stays in the target control zone to achieve a more ideal control state.
Illustratively, similar to the first control rule shown in fig. 3, the second control rule may also include 13 logical sequence numbers, as follows:
if the current analog value is in the external positive buffer area and the analog value change rate BHL is greater than or equal to-1.0, executing the logic sequence number 1, opening the second regulating valve to reduce the analog value, wherein the set value of the opening of the second regulating valve can be selected from 40% -80%, so that the analog value with larger deviation from the target control value can be more quickly approaching to the target control value, and the opening of the analog regulating valve at the moment can also be the initial opening.
And if the current analog value is in the external positive buffer area and the analog change rate BHL is smaller than-1.0, executing the logic sequence number 2, and controlling the second regulating valve to reduce the opening. At this time, the analog quantity value is lowered too fast, so the opening of the second regulating valve can be reduced in advance, so that the absolute value of the change rate of the analog quantity is reduced, the analog quantity value is more gradually approaching to the target control value, and the situations that the analog quantity value cannot stay in the target control region and passes through the negative buffer region and even the external negative buffer region due to over-regulation are reduced, for example, the set value of the opening of the first regulating valve can be selected from 20% -40%.
And if the current analog value is in the positive buffer area and the analog change rate BHL is smaller than or equal to-0.05, executing the logic sequence number 3, and controlling the opening of the second regulating valve to be 0%. At this time, the analog quantity value drops faster, and the second regulating valve opening can be closed in advance within the allowable deviation range, so that the analog quantity change rate is controlled within the interval range (-0.05, 0).
If the current analog value is in the negative buffer region and the analog change rate BHL is in the (-0.05, 0) range, the logic sequence number 4 is executed, the second regulating valve can be controlled, and the opening of the second regulating valve can be selected from 0% -5%. At this time, the analog quantity change rate can meet the demand for making the analog quantity value approach the target control value smoothly and relatively quickly, so the second regulator valve opening degree can be set to, for example, 5% to maintain the current analog quantity change rate as much as possible.
If the current analog value is in the negative buffer area and the analog change rate BHL is greater than or equal to 0, executing the logic sequence number 5, and controlling the second regulating valve, wherein the opening of the second regulating valve can be selected from 5% -10%. At this time, the analog quantity value is closer to the target control value, but the analog quantity value is slower in the falling speed, and the opening degree of the second regulating valve can be increased, so that the analog quantity change rate is controlled within a range of (-0.05, 0).
And if the current analog quantity value is in the target control area and the analog quantity change rate BHL is smaller than-0.1, executing the logic sequence number 6, and controlling the opening of the second regulating valve to be 0%. If the current analog quantity value is already in the target control area, the analog quantity value and the target control value are very close, the difference value between the two values may be affected by the measurement accuracy, and it is required to maintain the current analog quantity value at this time, preferably, the BHL is maintained in the interval of [ -0.1,0.1] as the target, if the BHL is greater than or equal to 0, the second regulating valve needs to be closed in advance, so as to slow down the descending trend of the analog quantity value.
If the current analog quantity value is in the target control area, the analog quantity change rate BHL is in the interval of [ -0.1,0.1], and the analog quantity change trend inflection point DD is greater than 0, executing the logic sequence number 7, and controlling the second regulating valve, wherein the opening of the second regulating valve can be selected from 3% -5%. At this time, the trend of the analog quantity value is changed from descending to ascending, so that the opening degree of the second regulating valve needs to be increased in advance to maintain the analog quantity value within the target control area.
If the current analog quantity value is in the target control area, the analog quantity change rate BHL is in the interval of [ -0.1,0.1], and the analog quantity change trend inflection point DD is smaller than 0, executing the logic sequence number 8, and controlling the opening of the second regulating valve to be 0%. At this time, the trend of the analog value is changed from rising to falling, so the first regulating valve needs to be closed in advance to maintain the analog value in the target control area.
If the current analog quantity value is in the target control area and the analog quantity change rate BHL is greater than or equal to 0.1, executing a logic sequence number 9, and controlling a second regulating valve, wherein the opening of the second regulating valve can be selected from 5% -10%. When BHL is greater than or equal to 0.1, the analog quantity value has a slower decreasing trend and an increasing trend, and the opening of the second regulating valve needs to be increased in advance to maintain the analog quantity value within the target control area.
If the current analog value is in the negative buffer area and the analog change rate BHL is smaller than or equal to-0.01, executing logic sequence number 10, closing the second regulating valve, opening the first regulating valve, wherein the opening of the first regulating valve can be selected from 5% -10%. At this time, the analog value is lowered to the negative buffer and the lowering speed is faster, and the first regulator valve needs to be opened to increase the analog value.
If the current analog quantity value is in the negative buffer area, the analog quantity change rate BHL is larger than-0.01, and the analog quantity change trend inflection point DD is larger than 0, executing the logic sequence number 11, and closing the first regulating valve and the second regulating valve. At this time, the change trend of the analog quantity value is changed from descending to ascending, and the analog quantity regulating valve can be closed in advance.
If the current analog quantity value is in the external negative buffer zone and the analog quantity variation trend inflection point DD is smaller than 0, executing a logic sequence number 12, closing the second regulating valve, opening the first regulating valve, wherein the opening of the first regulating valve can be selected from 10% -20%. At this time, the trend of the analog quantity value is changed from rising to falling, and the first regulating valve needs to be opened in advance.
And if the current analog quantity value is in the external negative buffer zone and the analog quantity variation trend inflection point DD is greater than 0, executing a logic sequence number 13, and closing the first regulating valve and the second regulating valve. At this time, the change trend of the analog quantity value is changed from descending to ascending, and the first regulating valve can be closed in advance.
It is understood that the above setting of the analog quantity change rate BHL and the analog quantity adjusting valve opening are only examples, and those skilled in the art can flexibly set according to actual needs.
Referring to fig. 5, the schematic diagram of an analog quantity control device based on a distributed control system according to an embodiment of the present application includes: an acquisition module 501, a determination module 502 and a control module 503.
The acquiring module 501 is configured to acquire a plurality of analog control intervals, analog values, analog change rates, and analog change trend inflection points;
the determining module 502 is configured to determine an analog quantity adjusting valve control rule based on an analog quantity value at a zero time; the analog quantity regulating valve control rules comprise corresponding relations between analog quantity change rates, analog quantity change trend inflection points and analog quantity regulating valve opening in different analog quantity control intervals;
the control module 503 is configured to control an opening of the analog quantity adjusting valve based on the analog quantity adjusting valve control rule, an analog quantity control interval in which the current analog quantity value is located, the analog quantity change rate, and the analog quantity change trend inflection point.
Therefore, in the embodiment of the application, the plurality of analog quantity control intervals are divided, and different analog quantity adjusting valve openings are configured for the combination of different analog quantity change rates and analog quantity change trend inflection points in each analog quantity control interval, so that the adjusting requirements of analog quantity values under different conditions can be more accurately met, the control precision, the control efficiency and the control stability of the analog quantity are improved, and the stability of the product quality is further improved.
Referring to fig. 6, the diagram is a structural diagram of a controller applied to a distributed control system according to an embodiment of the present application, where the controller includes: a memory 601 and a processor 602.
A memory 601: for storing the program code and for transmitting the program code to the processor.
Processor 602: and the steps of the analog quantity control method based on the distributed control system are executed according to the instructions in the program code.
In addition, the application further provides a computer readable storage medium, wherein the computer readable storage medium stores computer instructions, and when the computer instructions are executed on a controller applied to a distributed control system, the controller applied to the distributed control system executes the steps of the analog quantity control method based on the distributed control system.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. In particular, for the controller and storage medium embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and references to the parts of the description of the method embodiments are only required. The controller and storage medium embodiments described above are merely illustrative, in which elements illustrated as separate elements may or may not be physically separate, and elements illustrated as elements may or may not be physical elements, may be located in one place, or may be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing is merely one specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An analog quantity control method based on a distributed control system, which is characterized by comprising the following steps:
acquiring a plurality of analog quantity control intervals, analog quantity values, analog quantity change rates and analog quantity change trend inflection points;
determining an analog quantity regulating valve control rule based on the analog quantity value at the zero moment; the analog quantity regulating valve control rules comprise corresponding relations between analog quantity change rates, analog quantity change trend inflection points and analog quantity regulating valve opening in different analog quantity control intervals;
and controlling the opening of the analog quantity regulating valve based on the analog quantity regulating valve control rule, the analog quantity control interval in which the current analog quantity value is positioned, the analog quantity change rate and the analog quantity change trend inflection point.
2. The method of claim 1, wherein the plurality of analog control intervals comprises:
an outer positive buffer zone, a target control zone, a negative buffer zone and an outer negative buffer zone; the minimum value of the outer positive buffer is greater than the maximum value of the positive buffer; the minimum value of the positive buffer area is larger than the maximum value of the target control area; the minimum value of the target control area is larger than the maximum value of the negative buffer area; the minimum value of the negative buffer is greater than the maximum value of the outer negative buffer.
3. The method of claim 2, wherein determining an analog quantity regulator valve control rule based on an analog quantity control interval in which the analog quantity value is located and the analog quantity change rate comprises:
if the analog value at the zero moment is smaller than the target control value, determining that the analog regulating valve control rule is a first control rule; the target control value is the median value of the target control area;
and if the analog value at the zero moment is larger than the target control value, determining the control rule of the analog quantity regulating valve as a second control rule.
4. The method according to claim 3, wherein controlling the opening of the analog quantity adjusting valve based on the analog quantity control rule, the analog quantity control section in which the current analog quantity value is located, the analog quantity change rate, and the analog quantity change trend inflection point if the analog quantity value at the zero time is smaller than the target control value comprises:
if the current analog value is in the external negative buffer area, the negative buffer area or the target control area, controlling the opening of the first regulating valve based on the analog control area, the analog change rate and the analog change trend inflection point where the current analog value is; the first regulating valve is used for increasing the analog value;
if the current analog value is in the external positive buffer area or the positive buffer area, controlling the opening of the second regulating valve based on the analog control interval in which the current analog value is, the analog change rate and the analog change trend inflection point; the second regulating valve is used for reducing the analog quantity value.
5. The method of claim 4, wherein the opening of the first regulator valve is selected from 20% to 80% if the current analog quantity value is in the outer negative buffer;
if the current analog value is in the negative buffer area or the target control area, the opening of the first regulating valve is selected from 0-10%;
if the current analog value is in the positive buffer area or the external positive buffer area, the first regulating valve is closed, the second regulating valve is opened, and the opening of the second regulating valve is selected from 0% -20%.
6. The method according to claim 3, wherein controlling the opening of the analog quantity adjusting valve based on the analog quantity control rule, the analog quantity control section in which the current analog quantity value is located, the analog quantity change rate, and the analog quantity change trend inflection point if the analog quantity value at the zero time is greater than the target control value comprises:
if the current analog value is in the external negative buffer area or the negative buffer area, controlling the opening of the first regulating valve based on the analog control interval in which the current analog value is, the analog change rate and the analog change trend inflection point;
and if the current analog value is in the external positive buffer area, the positive buffer area or the target control area, controlling the opening of the second regulating valve based on the analog control area, the analog change rate and the analog change trend inflection point where the current analog value is.
7. The method of claim 6, wherein the opening of the second regulator valve is selected from 20% to 80% if the current analog quantity value is in the outer positive buffer;
if the current analog value is in the target control area or the positive buffer area, the opening of the second regulating valve is selected from 0-10%;
if the current analog value is in the external negative buffer zone or the negative buffer zone, closing the second regulating valve, and opening the first regulating valve, wherein the opening of the first regulating valve is selected from 0% -20%.
8. An analog quantity control device based on a distributed control system, the device comprising: the system comprises an acquisition module, a determination module and a control module;
the acquisition module is used for acquiring a plurality of analog quantity control intervals, analog quantity values, analog quantity change rates and analog quantity change trend inflection points;
the determining module is used for determining an analog quantity regulating valve control rule based on the analog quantity value at the zero moment; the analog quantity regulating valve control rules comprise corresponding relations between analog quantity change rates, analog quantity change trend inflection points and analog quantity regulating valve opening in different analog quantity control intervals;
the control module is used for controlling the opening of the analog quantity regulating valve based on the analog quantity regulating valve control rule, the analog quantity control interval where the current analog quantity value is located, the analog quantity change rate and the analog quantity change trend inflection point.
9. A controller for a distributed control system, the controller comprising: a memory and a processor;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the steps of the distributed control system-based analog quantity control method according to any one of claims 1-7 according to the program code.
10. A computer-readable storage medium, in which a computer program is stored which, when run on a controller applied to a distributed control system, performs the steps of the distributed control system-based analog quantity control method according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311755895.5A CN117742263A (en) | 2023-12-19 | 2023-12-19 | Analog quantity control method and related device based on distributed control system |
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| CN202311755895.5A CN117742263A (en) | 2023-12-19 | 2023-12-19 | Analog quantity control method and related device based on distributed control system |
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| CN202311755895.5A Pending CN117742263A (en) | 2023-12-19 | 2023-12-19 | Analog quantity control method and related device based on distributed control system |
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