WO2022267209A1

WO2022267209A1 - Parallel valve set control method and apparatus, controller, and storage medium

Info

Publication number: WO2022267209A1
Application number: PCT/CN2021/114288
Authority: WO
Inventors: 彭煜民; 张丹; 岳鹏超; 钟鑫亮; 韩吉双; 唐传壮; 符彦青; 王帅; 种阳阳
Original assignee: 南方电网调峰调频发电有限公司
Priority date: 2021-06-24
Filing date: 2021-08-24
Publication date: 2022-12-29
Also published as: CN113566122B; CN113566122A

Abstract

Disclosed are a parallel valve set control method and apparatus, a controller, and a storage medium. The method comprises: acquiring a real-time operating condition indicator value; according to a target correspondence between an operating condition indicator value, a first valve control means, a second valve control means, and an openness value, determining a target first valve control means, a target second valve control means, and a target openness value corresponding to the real-time operating condition indicator value; adjusting the first valve control means to the target first valve control means, and adjusting the second valve control means to the target second valve control means; if the target first valve control means is a manual control means, adjusting an openness value of the first valve to the target openness value; and if the target second valve control means is a manual control means, adjusting an openness value of the second valve to the target openness value. In this method, human error in operation can be avoided, and a probability of occurrence of a safety accident can be reduced, thereby improving safety.

Description

Parallel valve group control method, device, controller and storage medium

technical field

The present application relates to the technical field of industrial control, in particular to a parallel valve group control method, device, controller and storage medium.

Background technique

In the industrial field, for important pipelines in factories, parallel valve groups are generally set up to control them, so as to reduce the adverse effects caused by valve failures. Parallel valve group refers to two valves connected in parallel, one of which is used as the main valve and the other is used as the bypass valve. In the normal production process, the pipeline is mostly controlled by the main valve, and the bypass valve is put into use when the main valve fails. However, in some operating scenarios with high regulatory response requirements and safety requirements, or operating scenarios with large disturbance sources, it is difficult to meet the actual operating requirements with only one valve, so it is necessary to control through two valves at the same time.

However, when the two valves are put into control at the same time, the probability of safety accidents is high, and there is a problem of low safety.

Contents of the invention

Based on this, it is necessary to provide a parallel valve group control method, device, controller and storage medium capable of improving the operating safety of the parallel valve group in view of the above technical problems.

A method for controlling a parallel valve group, the method comprising:

Obtain the real-time working condition index value;

According to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value, the target first valve control mode, the target second valve control mode and the target opening value corresponding to the real-time working condition index value are determined. degree value;

adjusting the control mode of the first valve to the target first valve control mode, and adjusting the control mode of the second valve to the target second valve control mode;

If the target first valve control mode is manual control mode, adjust the opening value of the first valve to the target opening value; if the target second valve control mode is manual control mode, then adjust the opening value of the second valve is the target opening value.

In one of the embodiments, the corresponding relationship between the targets is the corresponding relationship between the value interval of the working condition index value, the first valve control mode, the second valve control mode and the opening value;

According to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value, the target first valve control mode, the target second valve control mode and the target opening value corresponding to the real-time working condition index value are determined. Degree value steps include:

Confirm the value interval of the working condition index value that the real-time working condition index value falls into as the target interval;

In the target correspondence relationship, the first valve control mode, the second valve control mode and the opening value corresponding to the target interval are respectively confirmed as the target first valve control mode, the target second valve control mode and the target opening value.

In one of the embodiments, the method is applied in the pipeline from the high-pressure feed water to the high-pressure steam drum of the boiler. In the target correspondence relationship, the first valve control mode, the second valve control mode and the opening value corresponding to the target interval are respectively confirmed as the target first valve control mode, the target second valve control mode and the target opening value, include:

When the TCA water supply pressure of the pipeline is greater than the preset pressure threshold, and the water level of the high-pressure steam drum meets the preset water level requirements, in the target correspondence relationship, the first valve control mode, the second valve control mode and the The opening value is respectively confirmed as the target first valve control mode, the target second valve control mode and the target opening value.

In one embodiment, the method includes:

Obtain the initial change trend of the index and the preset initial setting table; wherein, the initial setting table includes the value interval of the working condition index value, the first initial correspondence between the first valve control mode, the second valve control mode, and the opening value, and Including the upper and lower range limits of the working condition index value range and the second initial corresponding relationship of returning to the dead zone;

According to the first initial corresponding relationship, determine the target corresponding relationship under the initial change trend of the index, and according to the initial change trend of the indicator, the first initial corresponding relationship and the second initial corresponding relationship, determine the target corresponding relationship under the change trend opposite to the initial change trend of the indicator relation;

According to the change trend of the real-time working condition index value, determine the target first valve control mode, target second valve control mode and target opening value from the corresponding target correspondence.

In one of the embodiments, according to the initial change trend of the indicator, the first initial corresponding relationship and the second initial corresponding relationship, the step of determining the target corresponding relationship of the change trend opposite to the initial change trend of the indicator includes:

In the case that the initial change trend of the index is an upward trend, the updated working condition index value range is obtained according to the difference between the upper and lower interval limit values of each working condition index value range and the corresponding return dead zone;

In the case that the initial change trend of the index is a downward trend, the updated working condition index value range is obtained according to the sum of the upper and lower interval limit values of each working condition index value interval and the corresponding return dead zone;

Based on the value range of the working condition index value after updating, and the first valve control mode, the second valve control mode and the opening value corresponding to the value range of the working condition index value before updating in the first initial relationship, the initial value of the index is obtained. The corresponding relationship of the target under the change trend opposite to the change trend.

In one of the embodiments, the first initial corresponding relationship is the corresponding relationship between the number of operating conditions, the range of operating condition index values, the first valve control mode, the second valve control mode, and the opening value;

The step of determining the target corresponding relationship under the initial change trend of the indicator according to the first initial corresponding relationship includes:

Obtain the target working condition series, and according to the target working condition series, confirm part or all of the first initial corresponding relationship as the target corresponding relationship under the initial change trend of the index.

In one of the embodiments, any one of the target first valve control mode and the target second valve control mode is an automatic control mode, and the other is a manual control mode.

A parallel valve group control device, said device comprising:

The real-time working condition index value acquisition module is used to obtain the real-time working condition index value;

The control mode determination module is used to determine the target first valve control mode and the target second valve control mode corresponding to the real-time working condition index value according to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value. 2. Valve control mode and target opening value;

A control mode adjustment module, configured to adjust the control mode of the first valve to the target first valve control mode, and adjust the control mode of the second valve to the target second valve control mode;

The opening value adjustment module is used to adjust the opening value of the first valve to the target opening value when the target first valve control mode is manual control mode; when the target second valve control mode is manual control mode In this case, adjust the opening value of the second valve to the target opening value.

A controller includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

Obtain the real-time working condition index value;

According to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value, the target first valve control mode, the target second valve control mode and the target opening value corresponding to the real-time working condition index value are determined. Adjust the control mode of the first valve to the target first valve control mode, and adjust the control mode of the second valve to the target second valve control mode;

A computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

Obtain the real-time working condition index value;

In the above-mentioned parallel valve group control method, device, controller and storage medium, according to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value, the corresponding real-time working condition index value is determined. The target first valve control mode, the target second valve control mode and the target opening value, and adjust the control modes of the first valve and the second valve according to the target first valve control mode and the target second valve control mode. When the first valve and/or the second valve are switched to the manual control mode, the application can automatically adjust the opening value of the valve to the target opening value. In this way, the application can automatically determine and adjust the control parameters of the parallel valve group according to the real-time working conditions, so that both the first valve and the second valve can be automatically adjusted according to the set parameters, greatly reducing manual participation, thereby avoiding human misoperation. occurrence, reduce the probability of safety accidents, and thus improve safety. At the same time, it can also significantly reduce the monitoring operation pressure of the on-duty personnel, which is convenient for the on-duty personnel to better control and adjust the production and operation indicators of each system, so as to further improve safety.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the traditional technology. Obviously, the accompanying drawings in the following description are only the present invention For some embodiments of the application, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is an application environment diagram of a parallel valve group control method in an embodiment;

Fig. 2 is the first schematic flow chart of the parallel valve bank method in an embodiment;

Fig. 3 is a schematic flow chart of the steps of determining the control mode of the valve group in an embodiment;

Fig. 4 is a second schematic flow diagram of the parallel valve group method in one embodiment;

Fig. 5 is a first structural block diagram of a parallel valve group control device in an embodiment;

Fig. 6 is a second structural block diagram of a parallel valve group control device in an embodiment;

Fig. 7 is a structural block diagram of the association control parameter setting module in an embodiment;

Fig. 8 is an internal structure diagram of the controller in one embodiment.

detailed description

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.

It can be understood that the terms "first", "second" and the like used in this application may be used to describe various parameters/elements herein, but these parameters/elements are not limited by these terms. These terms are only used to distinguish a first parameter/element from another parameter/element. For example, a first valve could be termed a second valve, and, similarly, a second valve could be termed a first valve, without departing from the scope of the present application. Both the first valve and the second valve are valves, but they are not the same valve.

When used herein, the singular forms "a", "an" and "the/the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising/comprising" or "having" etc. specify the presence of stated features, integers, steps, operations, components, parts or combinations thereof, but do not exclude the presence or addition of one or more The possibility of other features, integers, steps, operations, components, parts or combinations thereof. Meanwhile, the term "and/or" used in this specification includes any and all combinations of the related listed items.

As mentioned in the background art, there is a problem of low safety in the current parallel valve group control method. The inventor found through research that the reason for this problem is that when the parallel valve group is used for control, the two valves of the valve group cannot be put into automatic PID regulation at the same time. In other words, when one of the valves is working in the mode of automatic adjustment, the other valve cannot be put into automatic PID adjustment at the same time, otherwise the opening degree of the two valves will fluctuate in a large range due to the constant change of the adjustment object index. Therefore, the opening value of at least one valve in the parallel valve group needs to be manually adjusted by the on-duty personnel from time to time, such as switching the control mode of the main valve to automatic PID adjustment, and switching the control mode of the bypass valve to manual adjustment. Manually open the bypass valve on the man-machine interface, and manually adjust the opening of the bypass valve from time to time according to the requirements of the production system parameters. Or, switch the control mode of the main valve to manual adjustment, and switch the control mode of the bypass valve to automatic PID adjustment. The working mode of this case can refer to the previous case.

It can be seen that the traditional method requires the on-duty personnel to continuously monitor the relevant indicators and perform frequent manual operations, which may easily lead to safety accidents due to misoperation, increase the probability of safety accidents, and have the problem of low safety. At the same time, the traditional method also greatly increases the operating pressure of the on-duty personnel to monitor the disk, squeezes the time for the on-duty personnel to monitor other systems, and further reduces the safety of the overall operation.

In order to improve the safety in the process of controlling the parallel valve group, the present application provides a method, device, controller and storage medium for controlling the parallel valve group.

The method for controlling a parallel valve group provided in this application can be applied to application scenarios including a parallel valve group, wherein a parallel valve group refers to a plurality of valves connected in parallel, and each valve can be used to control the same pipeline. For the convenience of description, the following embodiments take the parallel valve group including two valves (i.e. the first valve and the second valve) as an example. It should be noted that either one of the first valve and the second valve is the main valve, and the other is the bypass valve, for example, the first valve is the main valve, the second valve is the bypass valve, or the first valve is the bypass valve. valve, the second valve is the main valve. When any one of the first valve and the second valve is adjusted, the parameters of the pipeline (such as flow rate, etc.) can be changed accordingly.

In one of the embodiments, this application can be applied to the application environment shown in Figure 1, please refer to Figure 1, Figure 1 shows a schematic diagram of the pipeline from the high-pressure feed water to the high-pressure steam drum of a boiler in a gas-fired power plant. Among them, in addition to supplying water to the high-pressure steam drum to maintain the water level of the steam drum, the high-pressure water supply also undertakes the very critical duty of supplying water to the turbine air cooling (hereinafter referred to as TCA). Considering that the TCA water supply needs to maintain a large flow and pressure, and requires the flow and pressure to remain relatively stable, and at the same time, the high-pressure steam drum also needs to maintain an appropriate water level when the generator set is running with varying loads, so the first valve and the second valve need to be At the same time put into use to meet production needs.

In one embodiment, as shown in FIG. 2 , a method for controlling a parallel valve group is provided. The method is applied to a controller connected to each valve of the parallel valve group as an example for illustration. The method specifically includes the following steps:

Step 210, acquiring real-time operating condition index values.

Among them, the real-time working condition index value refers to the real-time value of the working condition index, and the working condition index refers to the variable index that can judge the change of the working condition, which can be identified by but not limited to the active power, flow, pressure and other monitoring programs of the system/unit variable. For ease of understanding, the following embodiments are described by taking the active power of the unit as an example of the working condition index. In one embodiment, each working condition indicator should determine its corresponding measurement unit to facilitate subsequent data analysis, for example, when the working condition indicator is active power, its measurement unit can be MW (megawatt).

Step 220: Determine the target first valve control mode and target second valve control mode corresponding to the real-time working condition index value according to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value and target opening value.

Specifically, the controller can obtain and/or store a plurality of correspondences about the working condition index value, the first valve control mode, the second valve control mode and the opening value. In each correspondence relationship, the same working condition index The values may correspond to different first valve control modes, different second valve control modes and/or different opening values. The controller determines one or more correspondences from multiple correspondences as the target correspondence, and uses the target correspondence as a reference to determine the first valve control method determined by the real-time working condition index value (that is, the target first valve control relationship ), the second valve control mode (that is, the target second valve control relationship) and the opening value (that is, the target opening value). In one of the embodiments, the controller may determine the corresponding target relationship according to the variation trend of the real-time operating condition index value and/or the operating condition series of the system/unit and other factors.

It can be understood that the target first valve control mode and the target second valve control mode can be determined according to the control accuracy of the system/unit, control algorithm requirements, control modes supported by each valve, real-time working condition index values and other factors. No specific limitation is made, as long as the two valves can make the output of the system and/or unit meet the production demand, for example, the target first valve control mode and the target second valve control mode can both be manual control modes. In one of the embodiments, the control mode of each valve can be automatic adjustment mode or manual control mode.

Step 230, adjusting the control mode of the first valve to the target first valve control mode, and adjusting the control mode of the second valve to the target second valve control mode.

Specifically, after determining the control mode of the two valves of the parallel valve group, the controller can adjust the two valves accordingly, so as to adjust the current control mode of the two valves to the corresponding target mode, that is, the control mode of the first valve Adjust to the target first valve control mode, and adjust the second valve control mode to the target second valve control mode. In one embodiment, the controller can adjust the control mode and opening value of each valve by sending corresponding control and adjustment instructions to the two valves, so that it can meet the index requirements of production operation.

Step 240, if the target first valve control mode is manual control mode, adjust the opening value of the first valve to the target opening value; if the target second valve control mode is manual control mode, adjust the opening value of the second valve to The opening degree value is adjusted to the target opening degree value.

Among them, when a certain valve works under manual control mode, the valve will receive the input fixed opening value and adjust accordingly, such as receiving and adjusting the opening value manually input by the person on duty. In the manual control mode, the opening value of the valve will not change automatically with the change of the real-time working condition index value, but will change according to the input fixed opening value. In other words, when the real-time working condition index value changes and no new fixed opening value is received (or the new fixed opening value is the same as the previous fixed opening value), the opening value of the valve will not change. will adjust.

Specifically, for any valve, if the target control mode corresponding to the valve is manual control mode, it is necessary to input a fixed opening value to the valve, so that the valve can adjust the opening of the device according to the fixed opening value. opening. In the traditional technology, the fixed opening value needs to be continuously monitored by the on-duty personnel on relevant working condition indicators, and manually input according to the monitoring results, so as to adjust the opening value of the valve under manual control mode. However, this application determines the target opening value corresponding to the real-time working condition index value according to the target corresponding relationship. For the valve in the manual control mode, the controller automatically outputs the target opening value to the valve, so that the valve can control the opening of the device. The value is adjusted to the target opening value. In this way, even for valves in manual control mode, this application can complete the determination of the target opening value and the adjustment of the valve opening value without manual participation, so that valves working in manual control mode can also be controlled according to the system. Or the operating condition of the unit to adjust its own opening value.

In one of the embodiments, after the control mode of a certain valve is adjusted to the manual control mode, the corresponding manual parameter setting window can automatically pop up in the man-machine interface, and the controller automatically enters the target opening value in the window and its unit of measure to complete the valve setting.

In one embodiment, one of the target first valve control mode and the target second valve control mode is an automatic control mode, and the other is a manual control mode. In other words, among the first valve and the second valve, one valve works in an automatic control mode (such as automatic PID control), and the other valve works in a manual control mode. Valves working in the automatic control mode can calculate the opening value of the valve through the automatic adjustment algorithm and adjust accordingly, so that the opening value of the valve can be automatically adjusted with the change of the working condition index. In one example, when the control mode of a certain valve is adjusted to select the automatic control mode, the corresponding automatic PID adjustment parameter setting window can be automatically popped up in the interface, and the controller can automatically input the parameters required for the automatic PID adjustment of the valve in this window. various adjustment parameters. In this way, one of the valves in the parallel valve group can be operated in an automatic control mode, thereby improving the control accuracy and timeliness.

Further, the controller can have an automatic control mode selection interlock function, that is, when any one of the first valve and the second valve is set to the automatic control mode, the other valve can no longer be set to the automatic control mode, but only It can be set to manual control mode to prevent the two valves from being in the automatic control mode and cause the valve opening adjustment to be unstable, thereby increasing the reliability and safety of the system operation.

In the above parallel valve group control method, according to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value, the target first valve control mode and the target corresponding to the real-time working condition index value are determined. The second valve control mode and the target opening value, and adjust the control modes of the first valve and the second valve according to the target first valve control mode and the target second valve control mode. When the first valve and/or the second valve are switched to the manual control mode, the application can automatically adjust the opening value of the valve to the target opening value. In this way, the application can automatically determine and adjust the control parameters of the parallel valve group according to the real-time working conditions, so that both the first valve and the second valve can be automatically adjusted according to the set parameters, greatly reducing manual participation, thereby avoiding human misoperation. occurrence, reduce the probability of safety accidents, and thus improve safety. At the same time, it can also significantly reduce the monitoring operation pressure of the on-duty personnel, which is convenient for the on-duty personnel to better control and adjust the production and operation indicators of each system, so as to further improve safety.

In one embodiment, the target correspondence is the correspondence between the value interval of the working condition index value, the first valve control mode, the second valve control mode and the opening value. Please refer to Figure 3, according to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value, determine the target first valve control mode and the target second valve corresponding to the real-time working condition index value The steps of control mode and target opening value include:

Step 310, confirming the value range of the working condition index value that the real-time working condition index value falls into as the target interval;

Step 320 , confirming the first valve control mode, the second valve control mode and the opening value corresponding to the target interval in the target correspondence relation as the target first valve control mode, the target second valve control mode and the target opening value respectively.

Specifically, the range of different working condition index values represents the classification of different working conditions of the system/unit, and the target correspondence is the corresponding relationship between the value range of the working condition index value and the corresponding valve group control mode. According to When the working condition determines the control mode of the parallel valve group, the controller can make a judgment according to the value interval in which the real-time working condition index value falls. The value intervals in which the real-time working condition index value falls are all target intervals, and the controller determines the valve group control mode corresponding to the target interval from the target correspondence relationship (namely, the target first valve control mode, the target second valve control valve mode and Target opening value), that is, confirm the first valve control mode corresponding to the target interval as the target first valve control mode, confirm the second valve control mode corresponding to the target interval as the target second valve control mode, and confirm the opening corresponding to the target interval The opening degree value is confirmed as the target opening degree value.

In this embodiment, the target first valve control mode, the target second valve control mode, and the target opening value are determined according to the value interval of the working condition index value in which the real-time working condition index value falls. When the real-time working condition index value changes , but when the classification of the working conditions of the system/unit is not changed, the control mode of the parallel valve group remains unchanged. In this way, frequent switching of the control mode of the parallel valve group can be avoided, thereby improving the reliability of the system/unit operation.

In one embodiment, the present application can be applied to the pipeline from high-pressure feed water to high-pressure steam drum, that is, it is used to control the parallel valve group arranged in the pipeline. In the target correspondence relationship, the first valve control mode, the second valve control mode and the opening value corresponding to the target interval are respectively confirmed as the target first valve control mode, the target second valve control mode and the target opening value, including :

Wherein, the preset pressure threshold and the preset water level requirements can be determined according to the application environment, system requirements and other factors, which are not specifically limited in this application. In one example, the preset pressure threshold may be 11MPA; in another example, the preset water level requirement may be that the water level of the high pressure drum is less than 0mm and greater than -300mm.

Specifically, the controller can judge the additional safety conditions, and only when the safety conditions of the accessories are met and the operating condition index value range is met, the controller will adjust the control mode of the parallel valve group according to the target correspondence. Among them, the additional safety conditions may include TCA water supply pressure and high-pressure steam drum water level, that is, when the TCA water supply pressure is greater than the preset pressure threshold and the water level of the high-pressure steam drum meets the preset water level requirements, the controller determines the parallel connection according to the target correspondence. The control mode of the valve group. When the TCA water supply pressure is less than/equal to the preset pressure threshold, or the water level of the high-pressure steam drum does not meet the preset water level requirements, even if the real-time working condition index value falls into a range of different working condition index values, the controller may not be correct. Parallel valve group for opening adjustment. In one embodiment, the additional security conditions can be set and judged in the form of script programs, selection variables, set values and logical relationships, which is not specifically limited in this application.

In this embodiment, by judging the TCA water supply pressure and the water level of the high-pressure steam drum, and in the case that both meet the preset conditions, the controller adjusts the control mode of the parallel valve group according to the target correspondence, which can further improve Safety of system/unit operation.

In one embodiment, please refer to FIG. 4 , the method for controlling the parallel valve group further includes:

Step 250, obtain the initial change trend of the index and the preset initial setting table; wherein, the initial setting table includes the value interval of the working condition index value, the first valve control mode, the second valve control mode and the first initial correspondence of the opening value The relationship also includes the second initial corresponding relationship between the upper and lower interval limits of the working condition index value range and the return dead zone;

Step 260: Determine the target corresponding relationship under the initial change trend of the indicator according to the first initial corresponding relationship, and determine the target corresponding relationship under the change trend opposite to the initial change trend of the indicator according to the initial change trend of the indicator, the first initial corresponding relationship and the second initial corresponding relationship. target correspondence.

Wherein, step 220 includes: step 222, according to the change trend of the real-time operating condition index value, determine the target first valve control mode, target second valve control mode and target opening value from the corresponding target correspondence.

Wherein, the initial change trend of the indicator may be a change value of a preset working condition indicator value, for example, it may be an upward trend or a downward trend.

Specifically, for different trends of real-time operating condition index values, the controller can obtain target correspondences corresponding to different changing trends respectively. In different target correspondences, the same real-time operating condition index value can correspond to the same or different The first valve control mode, the same or different second valve control mode and/or the same or different opening value. The controller determines the target first valve control mode, the target second valve control mode and the target opening value according to the change trend of the real-time working condition index value and adopts the target corresponding relationship corresponding to the change trend.

When obtaining the target correspondences corresponding to different changing trends, the controller first obtains the target correspondences and the preset initial setting table. Wherein, the initial setting table can be preset according to the requirements of the production process or the debugging situation. It can be understood that each parameter in the initial setting table can be modified according to the equipment debugging and operation conditions, so as to realize convenient and optimal control of the equipment. In one of the embodiments, the controller can download and save the initial setting table into the storage area in advance, so as to be called when used.

The initial setting table includes the first initial corresponding relationship and the second initial corresponding relationship, wherein the first initial corresponding relationship is the corresponding relationship between the working condition index value interval, the first valve control mode, the second valve control mode and the opening value , in other words, in the first initial correspondence, for two real-time working condition index values with different values, if they belong to the same working condition index value interval, then the first valve control method corresponding to the two real-time working condition index values , The control mode and opening value of the second valve are the same. The second initial corresponding relationship is the corresponding relationship between the upper and lower interval limits of the working condition index value range and the return dead zone, that is, for each working condition index value range, the upper limit value corresponds to a return dead zone, and the lower limit value corresponds to the return dead zone. The limit value corresponds to a return dead zone, and the two return dead zones may be the same or different, which is not specifically limited in this application. Among them, the return dead zone is used to determine the value interval of the working condition index corresponding to the change trend opposite to the initial change trend of the index. In one example, the initial setting table may be as shown in Table 1.

Table 1 Parallel valve group association control parameter setting table

Please refer to Table 1. Table 1 shows the return dead zone, the first valve control mode, the second Correspondence between valve control mode and opening value. As shown in Table 1, the working condition index is the active power of the unit, which can be specifically linked to the active program variable of the unit. The unit of measurement is MW, and the initial change trend of the index is rising. In Table 1, the value interval of the working condition index value corresponding to the first-level working condition is that the active power of the unit is between 0MW and 240MW, the return dead zone of the lower limit of the interval is 0MW, and the return dead zone of the upper limit of the interval is 20MW. The value range of the working condition index value corresponding to the second-level working condition is that the active power of the unit is between 240MW and 330MW, and the return dead zone corresponding to the lower limit of the range and the upper limit of the range is both 20MW. The value range of the working condition index value corresponding to the third-level working condition is when the active power of the unit is greater than 330MW, the return dead zone corresponding to the lower limit of the range is 20MW, and the upper limit of the range does not have a return dead zone, which is 0MW by default.

The controller may determine the target corresponding relationship under the initial change trend of the indicator according to the first initial corresponding relationship, for example, use the first initial corresponding relationship as the target corresponding relationship under the initial change trend of the indicator. At the same time, the controller can also determine the target corresponding relationship under the change trend opposite to the initial change trend of the indicator according to the initial change trend of the indicator, the first initial corresponding relationship and the second initial corresponding relationship. When determining the target first valve control mode, the target second valve control mode, and the target opening value, the controller can choose the target corresponding relationship corresponding to the change trend of the real-time working condition index value, and determine each target parameter accordingly.

In this embodiment, the target corresponding relationship under the initial change trend of the indicator is determined according to the first initial corresponding relationship, and the target corresponding relationship opposite to the initial change trend of the indicator is determined according to the initial change trend of the indicator, the first initial corresponding relationship, the interval limit and the return dead zone. The target correspondence relationship under the changing trend. In actual use, the controller can select the corresponding target relationship to determine the valve control method according to the change trend of the real-time working condition index value, so as to improve the control accuracy and avoid the real-time working condition index value from being above or below the interval limit Frequent switching caused by fluctuations to improve control reliability.

In one embodiment, according to the initial change trend of the indicator, the first initial correspondence and the second initial correspondence, the step of determining a target correspondence under a change trend opposite to the initial change trend of the indicator, include:

In the case that the initial change trend of the index is an upward trend, the updated working condition index value range is obtained according to the difference between the upper and lower interval limit values of each of the working condition index value intervals and the corresponding return dead zone ;

In the case that the initial change trend of the index is a downward trend, the updated working condition index value range is obtained according to the sum of the upper and lower interval limit values of each of the working condition index value intervals and the corresponding return dead zone ;

Based on the value range of the working condition index value after the update, and the first valve control mode, the second valve control mode and the opening value corresponding to the value range of the working condition index value before updating in the first initial relationship, Obtain the target corresponding relationship under the change trend opposite to the initial change trend of the index.

Specifically, when the initial change trend of the index is an upward trend, when the index value of the real-time working condition returns from the high point (that is, the downward trend), the corresponding upper/lower limit value of the interval is equal to the upper/lower limit value of the interval corresponding to the same level of working condition when it rises. The lower limit value minus the corresponding return dead zone; when the initial change trend of the index is a downward trend, when the real-time working condition index value returns from a low point (that is, an upward trend), the corresponding upper/lower limit value of the interval is equal to the same level when it is declining The upper/lower limit value of the interval corresponding to the working condition plus the corresponding return dead zone. For the same level of working conditions, the first valve control mode, the second valve control mode and the opening value corresponding to the system/unit in the upward trend are the same as the first valve control mode and the second valve control mode corresponding to the downward trend. The method is the same as the opening value, the difference is that the range of working condition index values corresponding to the same level of working conditions in the upward trend is different from the corresponding working condition index value range in the downward trend, and the corresponding working condition index value range in the upward trend The limit value of the value interval of the working condition index value is greater than the limit value of the corresponding working condition index value interval under the downward trend.

Taking Table 1 as an example, the initial change trend of the index is an upward trend. Under the upward trend, the value range of the index value of the working condition corresponding to the first-level working condition is that the active power of the unit is between 0MW and 240MW. Then under the downward trend, the upper limit value of the interval corresponding to the first-level working condition is 240MW-20MW=220MW, and the lower limit value of the interval is 0MW-0MW=0MW; similarly, under the downward trend, the corresponding interval of the second-level working condition The upper limit value of the interval is the upper limit return value 330MW-20MW=310MW, and the lower limit value of the interval is 240MW-20MW=220MW; because the third-level working condition does not set the upper limit value of the interval, there is no interval upper limit under the downward trend and the upward trend The limit value, while the lower limit of the interval under the downward trend is 330MW-20MW=310MW. From this, it can be obtained that the target correspondence between the upward trend and the downward trend can be shown in Table 2.

Table 2 The actual implementation strategy table of parallel valve group association control

For example, please refer to Table 1 and Table 2. When the index value of the real-time working condition increases gradually, and the value is 230MW, the target first valve control mode is manual control mode, and the target opening value of the first valve is 0% , the target second valve control mode is automatic control mode. When the real-time working condition index value rises from 230MW to 250MW, the target first valve control mode is manual control mode, the target opening value of the first valve is 6%, and the target second valve control mode is automatic control mode. When the real-time working condition index value drops from 250MW to 230MW, since 230MW is greater than 220MW, the unit is still in the second-level working condition at this time, and the target first valve control mode is kept as manual control mode, and the target opening value of the first valve is 6%, and the target second valve control mode is the control mode of the automatic control mode. When the real-time working condition index value drops from 230MW to 210MW, since 210MW is less than 220MW, the unit is in the first-level working condition at this time, and the target first valve control mode is manual control mode, and the target opening value of the first valve is 0% , the target second valve control mode is automatic control mode.

In this embodiment, when the initial change trend of the indicator is an upward trend, the updated value of the working condition indicator is obtained according to the difference between the upper and lower limit values of the value intervals of the working condition indicator values and the corresponding return dead zone Interval; when the initial change trend of the index is a downward trend, according to the sum of the upper and lower interval limit values of each of the operating condition index value intervals and the corresponding return dead zone, the updated operating condition index value interval is obtained . And according to the value range of the updated working condition index value, the target corresponding relationship under the change trend opposite to the initial change trend of the index can be obtained. In this way, it can be ensured that under the same working condition series, the interval limit of the downward trend is smaller than the interval of the upward trend Limit value, to avoid frequent switching caused by the real-time working condition index value fluctuating up and down in the interval limit value, thereby improving the reliability of control.

In one embodiment, the first initial corresponding relationship is the corresponding relationship between the number of operating conditions, the range of operating condition index values, the first valve control mode, the second valve control mode, and the opening value.

The step of determining the target corresponding relationship under the initial change trend of the index according to the first initial corresponding relationship includes: obtaining the target working condition series, and calculating the first initial corresponding relationship according to the target working condition series Part or all of is confirmed as the target corresponding relationship under the initial trend of the indicator.

Specifically, the controller acquires the input target working condition series, and according to the target working condition series, the control mode in which the working condition series in the first initial relationship is less than or equal to the target working condition series is confirmed as the initial change of the index The target correspondence under the trend. It can be understood that the target number of working conditions may be smaller than the set number of working conditions in the initial setting table, where the set number of working conditions refers to the maximum number of working conditions in the initial setting table. Taking Table 1 as an example, the number of working conditions in Table 1 is set to 3, and the initial change trend of the index is an upward trend, that is, Table 1 includes the initial corresponding relationship under the three working conditions. When the number of target operating conditions is 3, the corresponding relationship of targets under each trend can be shown in Table 2. When the number of target operating conditions is 2, the controller confirms the control methods corresponding to the first-level operating conditions and the second-level operating conditions in Table 1 as the corresponding relationship of targets under the upward trend, and accordingly determines the target under the downward trend Correspondence. It can be understood that the corresponding relationship of targets under the downward trend at this time consists of the control methods corresponding to the first-level working conditions and the second-level working conditions, and does not include the control methods corresponding to the third-level working conditions.

In this embodiment, by obtaining the target working condition series and determining the target corresponding relationship according to the target working condition series, the judgment interval of the real-time working condition index value can be adjusted to achieve convenient and optimal control.

In order to facilitate the understanding of the solution of the present application, a specific example is used below to illustrate. The initial setting table is shown in Table 1, and the corresponding relationship between targets under the upward trend and downward trend is shown in Table 2. The controller stores the initial setting table, and according to the initial setting table, the initial change trend of the index and the target working condition series, obtains the setting series of working conditions, the value interval of each working condition index value and additional safety conditions, and can obtain each The valve control mode and parameter setting values under working conditions are the strategy table shown in Table 2. When the controller receives the input command of the association control function, and judges that the real-time working condition index value meets a certain set working condition condition, it sends control and parameter adjustment instructions to the parallel first valve and the second valve respectively. The parallel valve group is used to receive the control and adjustment instructions sent by the controller, and adjust the opening of the valve accordingly to meet the requirements of production and operation indicators.

Specifically, when the controller receives the input command of the association control function, it performs association control on the parallel valve groups. During the process:

When the active power of the unit starts to rise from 0MW but does not exceed 240MW, if the TCA water supply pressure is greater than 11MPa and the water level of the high-pressure drum is between 0mm and -300mm, the controller sends an instruction to the first valve to set the first valve to It is set as manual control mode and the opening is fully closed. The controller sends instructions to the second valve to set the second valve in an automatic control mode and the opening degree is automatically adjusted by PID control.

When the active power of the unit continues to rise, and the power value exceeds 240MW but not more than 330MW, if the TCA water supply pressure is greater than 11MPa and the water level of the high-pressure drum is between 0mm and -300mm, the controller sends an instruction to the first valve to The first valve is set to manual control mode with an opening of 6%. The controller sends instructions to the second valve to set the second valve in an automatic control mode and the opening degree is automatically adjusted by PID control.

When the active power of the unit continues to increase and the power value exceeds 330MW, if the TCA water supply pressure is greater than 11MPa and the water level of the high-pressure steam drum is between 0mm and -300mm, the controller sends an instruction to the first valve to set the first valve to It is set as automatic control mode and the opening is automatically adjusted by PID control. The controller sends an instruction to the second valve to set the second valve in a manual control mode with an opening of 4%.

When the active power of the unit exceeds 330MW and starts to decrease after running for a period of time, but the power value still exceeds 310MW, if the TCA water supply pressure is greater than 11MPa and the water level of the high-pressure drum is between 0mm and -300mm, the controller will send A valve sends an instruction to set the first valve in an automatic control mode and the opening is automatically adjusted by PID control. The controller sends an instruction to the second valve to set the second valve in a manual control mode with an opening of 4%.

When the active power of the unit continues to decrease, and the power value is lower than 310MW, or starts to decrease after exceeding 240MW for a period of time, but still exceeds 220MW, if the TCA water supply pressure is greater than 11MPa and the water level of the high-pressure drum is between 0mm and -300mm During the period, the controller sends an instruction to the first valve to set the first valve in manual control mode with an opening of 6%. The controller sends instructions to the second valve, so that the second valve is set to an automatic control mode and the opening is automatically adjusted by PID control;

When the active power of the unit continues to decrease and the power value is lower than 220MW, if the TCA water supply pressure is greater than 11MPa and the water level of the high-pressure drum is between 0mm and -300mm, the controller sends an instruction to the first valve to switch the first valve Set to manual control mode and the opening is fully closed. The controller sends instructions to the second valve to set the second valve in an automatic control mode and the opening degree is automatically adjusted by PID control.

When the controller receives the exit command of the association control function, the parallel valve group maintains the original working state.

It should be understood that although the various steps in the flow charts in FIGS. 2-4 are displayed sequentially as indicated by the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in Figures 2-4 may include multiple steps or stages, these steps or stages are not necessarily executed at the same moment, but may be executed at different moments, the execution of these steps or stages The sequence is not necessarily performed sequentially, but may be performed alternately or alternately with other steps or at least a part of steps or stages in other steps.

In one embodiment, as shown in FIG. 5 , a parallel valve group control device is provided, including:

In one embodiment, the target correspondence is the correspondence between the value range of the working condition index value, the first valve control mode, the second valve control mode and the opening value. The control mode determination module includes a target interval determination unit and a control mode determination unit, wherein the target interval determination unit is used to confirm the value interval of the operating condition index value in which the real-time operating condition index value falls as the target interval. The control mode determination unit is used to confirm the first valve control mode, the second valve control mode and the opening value corresponding to the target interval in the target correspondence relationship as the target first valve control mode, the target second valve control mode and the target valve control mode respectively. opening value.

In one of the embodiments, the device is applied in the pipeline from high-pressure feed water to high-pressure steam drum. The control mode determination unit is used to set the first valve control mode corresponding to the target interval, The second valve control mode and the opening value are respectively confirmed as the target first valve control mode, the target second valve control mode and the target opening value.

In one of the embodiments, the device further includes a data acquisition module and a target correspondence determination module. Among them, the data acquisition module is used to obtain the initial change trend of the index and the preset initial setting table; the initial setting table includes the value interval of the working condition index value, the first valve control mode, the second valve control mode and the first value of the opening value. The initial corresponding relationship also includes the second initial corresponding relationship between the upper and lower interval limits of the working condition index value range and the return dead zone. The target correspondence determination module is used to determine the target correspondence relationship under the initial change trend of the index according to the first initial correspondence relationship, and determine the target correspondence relationship opposite to the initial change trend of the index according to the initial change trend of the index, the first initial correspondence relationship and the second initial correspondence relationship. The target correspondence relationship under the changing trend. The control mode determination module is also used to determine the target first valve control mode, the target second valve control mode and the target opening value from the corresponding target correspondence according to the change trend of the real-time working condition index value.

In one of the embodiments, the target correspondence determination module includes an interval update unit and a target correspondence acquisition unit. Among them, the interval update unit is used to obtain the updated working condition index value according to the difference between the upper and lower interval limit values of each working condition index value interval and the corresponding return dead zone when the initial trend of the index is an upward trend Value interval; when the initial change trend of the index is a downward trend, according to the sum of the upper and lower interval limits of each working condition index value interval and the corresponding return dead zone, the updated working condition index value interval is obtained . The target corresponding relationship acquisition unit is used for the first valve control mode, the second valve control mode and the opening and closing mode corresponding to the value interval of the working condition index value after the update, and the value interval of the working condition index value before updating in the first initial relationship. degree value, to obtain the target corresponding relationship under the trend opposite to the initial trend of the indicator.

In one of the embodiments, the first initial corresponding relationship is the corresponding relationship between the number of operating conditions, the value interval of the operating condition index value, the first valve control mode, the second valve control mode and the opening value. The target corresponding relationship determining module also includes a working condition series determining module, which is used to obtain the target working condition series, and according to the target working condition series, part or all of the first initial corresponding relationship is confirmed as the index under the initial change trend. target correspondence.

In one embodiment, one of the target first valve control mode and the target second valve control mode is an automatic control mode, and the other is a manual control mode.

In another embodiment, as shown in FIG. 6 , the parallel valve group control device may include a linkage control parameter setting module, a parameter storage module, a program execution module, and a linkage control function switching module. Among them, the association control parameter setting module is used to set the initial setting table and the corresponding relationship of targets under each change trend, and download the parameters to the parameter storage module. The parameter storage module is used for storing various parameters preset by the association control parameter setting module, and providing these parameters to the program execution module for use. The program execution module is used to read the preset association control parameters from the parameter storage area, execute related programs, and send control and adjustment instructions to the two parallel valves, so that the parallel valve group can adjust the valve opening to meet the production operation Indicator requirements. The association control function switching module is used to enable or exit the association control function of the parallel valve group. Further, only when the association control function is enabled, the program execution module will execute the program and send control and adjustment commands to the parallel valve group. When the association control function exits, the parallel valve group maintains the original working state.

As shown in FIG. 7 , the association control parameter setting module may include an operating condition setting unit, a first valve control mode setting unit, and a second valve control mode setting unit. Among them, the operating condition setting unit is used to realize the functions of setting the target working condition series and the initial change trend of the index, selecting the working condition index and setting the classified working condition. Among them, the classification working condition setting function can include the working condition index value interval setting function (can be used to set the interval limit and return dead zone) and the accessory safety condition setting function, that is, the initial setting table can be set by the operating condition setting unit Change the data in .

The first valve control mode setting unit is used to adjust the control mode and opening value of the first valve, and the second valve control mode setting unit is used to adjust the control mode and opening value of the second valve. The first valve control mode setting unit and the second valve control mode setting unit provide manual and automatic options for each setting working condition. Further, an automatic mode selection interlock function is set between the first valve control mode setting unit and the second valve control mode setting unit. When a certain working condition in one unit has been set to automatic control mode, the control mode of the same setting working condition of the other unit can no longer be selected as automatic control mode, but manual control mode can only be selected to prevent Both valves are in the automatic adjustment mode, which leads to the instability of valve opening adjustment. As shown in Table 1, in the 1st and 2nd working conditions, when the second valve has been set to the automatic control mode, the first valve can be set to the manual control mode; in the 3rd working condition, when When the first valve has been set to automatic control mode, the second valve can be set to manual mode.

For the specific limitations of the parallel valve group control device, please refer to the above-mentioned definition of the parallel valve group control method, which will not be repeated here. Each unit in the above-mentioned parallel valve group control device can be fully or partially realized by software, hardware and a combination thereof. Each of the above units may be embedded in or independent of the processor in the computer device in the form of hardware, and may also be stored in the memory of the computer device in the form of software, so that the processor can invoke and execute the corresponding operations of the above units.

In one embodiment, a controller is provided, which may be a server, and its internal structure may be as shown in FIG. 8 . The controller includes a processor, memory and network interface connected by a system bus. Among them, the processor of the controller is used to provide calculation and control capabilities. The memory of the controller includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs and databases. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database of the controller is used to store data such as initial setting table, target correspondence relation and so on. The network interface of the controller is used to communicate with external terminals through network connection. When the computer program is executed by the processor, a parallel valve group control method is realized.

Those skilled in the art can understand that the structure shown in Figure 8 is only a block diagram of a part of the structure related to the solution of this application, and does not constitute a limitation on the controller to which the solution of this application is applied. The specific controller can be More or fewer components than shown in the figures may be included, or some components may be combined, or have a different arrangement of components.

In one embodiment, a controller is also provided, including a memory and a processor, where a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps in the foregoing method embodiments are implemented.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the computer programs can be stored in a non-volatile computer-readable memory In the medium, when the computer program is executed, it may include the processes of the embodiments of the above-mentioned methods. Wherein, any references to memory, storage, database or other media used in the various embodiments provided in the present application may include at least one of non-volatile memory and volatile memory. Non-volatile memory may include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above-mentioned embodiments only represent several implementation modes of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the scope of the patent for the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims

A method for controlling a parallel valve group, characterized in that the method comprises:

Obtain the real-time working condition index value;

According to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value, the target first valve control mode, the target second valve control mode and the target second valve control mode corresponding to the real-time working condition index value are determined. Target opening value;

adjusting the control mode of the first valve to the target first valve control mode, and adjusting the control mode of the second valve to the target second valve control mode;

If the target first valve control mode is the manual control mode, adjusting the opening value of the first valve to the target opening value; if the target second valve control mode is the manual control mode, Then adjust the opening value of the second valve to the target opening value.
The method according to claim 1, wherein the target corresponding relationship is the corresponding relationship between the value interval of the working condition index value, the first valve control mode, the second valve control mode and the opening value;

According to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value, the target first valve control mode, the target second valve control mode and the target second valve control mode corresponding to the real-time working condition index value are determined. The steps for the target opening value include:

Confirming the value interval of the working condition index value in which the real-time working condition index value falls into is the target interval;

In the target corresponding relationship, the first valve control mode, the second valve control mode and the opening value corresponding to the target interval are respectively confirmed as the target first valve control mode and the target second valve control mode and the target opening value.
The method according to claim 2, characterized in that the method is applied in the pipeline from high-pressure feed water to high-pressure steam drum;

In the target corresponding relationship, the first valve control mode, the second valve control mode and the opening value corresponding to the target interval are respectively confirmed as the target first valve control mode and the target second valve control mode and the steps of the target opening value, comprising:

When the TCA water supply pressure of the pipeline is greater than the preset pressure threshold, and the water level of the high-pressure steam drum meets the preset water level requirements, in the target correspondence relationship, the first valve corresponding to the target interval is controlled The mode, the second valve control mode and the opening value are confirmed as the target first valve control mode, the target second valve control mode and the target opening value respectively.
The method according to claim 1, further comprising:

Obtain the initial change trend of the index and the preset initial setting table; the initial setting table includes the value interval of the working condition index value, the first initial correspondence between the first valve control mode, the second valve control mode and the opening value, and Including the upper and lower interval limits of the working condition index value range and the second initial corresponding relationship between the return dead zone;

Determine the target corresponding relationship under the initial change trend of the indicator according to the first initial corresponding relationship, and determine the corresponding relationship with the target according to the initial change trend of the indicator, the first initial corresponding relationship and the second initial corresponding relationship The target correspondence relationship under the change trend opposite to the initial change trend of the index;

According to the target corresponding relationship between the working condition index value, the first valve control mode, the second valve control mode and the opening value, the target first valve control mode, the target second valve control mode and the target second valve control mode corresponding to the real-time working condition index value are determined. The steps for the target opening value include:

The target first valve control mode, the target second valve control mode and the target opening value are determined from the corresponding target correspondence according to the change trend of the real-time working condition index value.
The method according to claim 4, characterized in that, according to the initial trend of change of the index, the first initial corresponding relationship and the second initial corresponding relationship, it is determined that the initial change trend of the index is opposite to the initial change trend of the index. The steps of the target correspondence, including:

In the case that the initial change trend of the index is an upward trend, the updated working condition index value range is obtained according to the difference between the upper and lower interval limit values of each of the working condition index value intervals and the corresponding return dead zone ;

In the case that the initial change trend of the index is a downward trend, the updated working condition index value range is obtained according to the sum of the upper and lower interval limit values of each of the working condition index value intervals and the corresponding return dead zone ;

Based on the value range of the working condition index value after the update, and the first valve control mode, the second valve control mode and the opening value corresponding to the value range of the working condition index value before updating in the first initial relationship, Obtain the target corresponding relationship under the change trend opposite to the initial change trend of the index.
The method according to claim 4, wherein the first initial corresponding relationship is the corresponding relationship between the working condition series, the working condition index value range, the first valve control mode, the second valve control mode and the opening value ;

The step of determining the target corresponding relationship under the initial trend of the index change according to the first initial corresponding relationship includes:

Acquiring the target working condition series, and according to the target working condition series, confirming part or all of the first initial corresponding relationship as the target corresponding relationship under the initial change trend of the index.
The method according to any one of claims 1 to 6, wherein one of the target first valve control mode and the target second valve control mode is an automatic control mode, and the other is a manual control mode .
A parallel valve group control device, characterized in that the device comprises:

The real-time working condition index value acquisition module is used to obtain the real-time working condition index value;

The control mode determination module is used to determine the target first valve control mode corresponding to the real-time working condition index value, Target second valve control mode and target opening value;

A control mode adjustment module, configured to adjust the control mode of the first valve to the target first valve control mode, and adjust the control mode of the second valve to the target second valve control mode;

An opening value adjustment module, configured to adjust the opening value of the first valve to the target opening value when the target first valve control mode is a manual control mode; When the valve control mode is the manual control mode, the opening value of the second valve is adjusted to a target opening value.
A controller, comprising a memory and a processor, the memory stores a computer program, wherein the processor implements the steps of the method according to any one of claims 1 to 7 when executing the computer program.
A computer-readable storage medium, on which a computer program is stored, wherein, when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are realized.