CN113606638A - Accurately-adjusted air source heat pump group control method and system - Google Patents
Accurately-adjusted air source heat pump group control method and system Download PDFInfo
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- CN113606638A CN113606638A CN202111183515.6A CN202111183515A CN113606638A CN 113606638 A CN113606638 A CN 113606638A CN 202111183515 A CN202111183515 A CN 202111183515A CN 113606638 A CN113606638 A CN 113606638A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
Abstract
The invention provides a method and a system for controlling an air source heat pump group with accurate adjustment, belonging to the technical field of air source heat pumps, wherein the method comprises the following steps: acquiring a return water temperature measurement value of the air source heat pump group; calculating the deviation between the return water temperature measurement value and the corresponding temperature threshold value, and performing control step switching control by combining the start-stop relation of the control step and the heat pump unit according to the integral quantity of the deviation and the variation trend of the return water temperature measurement value; according to the invention, step switching is carried out according to the deviation between the measured value of the return water temperature and the expected value, so that the start and stop of a certain heat pump unit or a plurality of heat pump units are accurately adjusted, and the accurate matching of the running number of the heat pump units and the heat supply requirement is realized; the integrator is arranged, step switching is carried out when control deviation is accumulated to a certain threshold value, frequent start and stop of the air source heat pump unit caused by frequent step switching in a critical area are avoided, and accurate control of the air source heat pump is achieved on the premise that unit safety is guaranteed.
Description
Technical Field
The invention relates to the technical field of air source heat pumps, in particular to a method and a system for controlling an air source heat pump group with accurate adjustment.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
An air source heat pump is an energy-saving device which utilizes high-level energy to enable heat to flow from a low-level heat source to a high-level heat source. The air is used as a low-level heat source of the heat pump, is inexhaustible, is available everywhere and can be acquired without compensation, and the air source heat pump is convenient to install and use.
The inventor finds that a central heating air source heat pump system is often composed of dozens or dozens of heat pump units, the control mode generally adopts batch control, usually, one or more heat pump units are started when the temperature is lower than a set value and stopped when the temperature is higher than the set value according to the return water temperature, the start-stop process of the heat pump units is simple and easy to operate, but the control on each heat pump unit is not accurate enough, the number of the opened heat pump units is often not matched with the heat supply requirement, resource waste is caused, the problems of low control precision and low automation degree exist.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a control method and a control system for an air source heat pump group with accurate adjustment, which avoid frequent start and stop of the air source heat pump group caused by frequent step switching in a critical area and realize accurate control of the air source heat pump on the premise of ensuring the safety of the unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a control method of an air source heat pump group with accurate adjustment.
A control method of an air source heat pump group with precise adjustment comprises the following steps:
acquiring a return water temperature measurement value of the air source heat pump group;
calculating the deviation between the return water temperature measurement value and the corresponding temperature threshold value, and performing control step switching control by combining the start-stop relation of the control step and the heat pump unit according to the integral quantity of the deviation and the variation trend of the return water temperature measurement value;
wherein, switching to a higher step level comprises:
the product of the first coefficient and the expected temperature is a first threshold value, the first coefficient is smaller than 1, the deviation between the acquired return water temperature measurement value and the first threshold value is input into an integrator, and when the integral quantity reaches the upper integral limit and the variation trend of the measurement value is continuously reduced, a switching condition is triggered to switch to a higher step;
and when the obtained return water temperature measurement value is smaller than the second threshold value, triggering a switching condition and directly switching to a high step.
Further, switching to a lower step level includes:
and when the integral quantity reaches the upper integral limit and the variation trend of the measured value is continuously increased, triggering a switching condition to switch to a lower step.
Further, switching to the lower step further includes:
and when the obtained return water temperature measurement value is greater than the fourth threshold value, triggering a switching condition and directly switching to a low step level.
The invention provides a control system of an air source heat pump group with precise regulation in a second aspect.
A precision-tuned air source heat pump cluster control system, comprising:
a data acquisition module configured to: acquiring a return water temperature measurement value of the air source heat pump group;
a step switching control module configured to: calculating the deviation between the return water temperature measurement value and the corresponding temperature threshold value, and performing control step switching control by combining the start-stop relation of the control step and the heat pump unit according to the integral quantity of the deviation and the variation trend of the return water temperature measurement value;
wherein, switching to a higher step level comprises:
the product of the first coefficient and the expected temperature is a first threshold value, the first coefficient is smaller than 1, the deviation between the acquired return water temperature measurement value and the first threshold value is input into an integrator, and when the integral quantity reaches the upper integral limit and the variation trend of the measurement value is continuously reduced, a switching condition is triggered to switch to a higher step;
and when the obtained return water temperature measurement value is smaller than the second threshold value, triggering a switching condition and directly switching to a high step.
Further, switching to a lower step level includes:
and when the integral quantity reaches the upper integral limit and the variation trend of the measured value is continuously increased, triggering a switching condition to switch to a lower step.
Further, switching to the lower step further includes:
and when the obtained return water temperature measurement value is greater than the fourth threshold value, triggering a switching condition and directly switching to a low step level.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the method and the system, the switching control of the control steps is carried out according to the integral quantity of the deviation between the measured value of the return water temperature and the corresponding temperature threshold value and the variation trend of the measured value of the return water temperature and by combining the control steps and the starting and stopping relations of the heat pump units, so that the starting and stopping of one or more heat pump units are accurately adjusted, and the accurate matching of the running quantity of the heat pump units and the heat supply requirement is realized.
2. According to the method and the system, the integrator is arranged, step switching is carried out only when the control deviation is accumulated to a certain threshold value, frequent starting and stopping of the air source heat pump unit caused by frequent step switching in a critical area are avoided, and accurate control of the air source heat pump is realized on the premise of ensuring unit safety.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic flow chart of a control method of an air source heat pump group with precise regulation according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of step-level upcut logic provided in embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of step-level undercut logic provided in embodiment 1 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1:
as shown in fig. 1, embodiment 1 of the present invention provides a method for controlling an air source heat pump group with precise regulation, including the following steps:
acquiring a return water temperature measurement value of the air source heat pump group;
and calculating the deviation between the return water temperature measurement value and the corresponding temperature threshold value, and performing control step switching control by combining the start-stop relation of the control step and the heat pump unit according to the integral quantity of the deviation and the variation trend of the return water temperature measurement value.
Each control step corresponds to different air source heat pump unit start-stop relations, and the higher the control step is, the more the number of the air source heat pump units is started.
Specifically, in order to realize accurate adjustment of each heat pump unit, a series of control steps are designed, and each step corresponds to the start-stop relation of different heat pump units. The group control strategy is to switch the steps according to the deviation between the measured value of the return water temperature and the expected value, so that the start and stop of one or more heat pump units are accurately adjusted, and the accurate matching between the running quantity of the heat pump units and the heat supply requirement is realized. Meanwhile, in consideration of inertia of a thermodynamic system, the control strategy is not to directly switch the step, but to set an integrator, and the step switching is carried out when the control deviation is accumulated to a certain threshold value, so that frequent start and stop of the unit caused by frequent step switching in some critical areas are avoided.
S1: step design
According to the running states of multiple heat pump units, dividing into S1-SNAnd (4) carrying out step by step. For example, a heating system with 16 heat pump units can be divided into eight steps from S1 to S8, with 2 heat pumps as a group, according to the start/stop state of the unit, and the corresponding relationship between each step and each heat pump is shown in table 1.
Table 1: corresponding relation between step and each heat pump
S2: control logic design
Firstly, an actual value P of the backwater temperature is obtained through measurement, and then a temperature set value P is obtained according to expectation0，0.95P0To 1.05P0If the actual value P exceeds the range, the corresponding control deviation is accumulatedAnd setting a pure integral controller to integrate the deviation value, and determining whether to switch the step according to the output of the integral controller.
S3: step-wise upcut logic
Step up, i.e. switching to the next step representing the current step, means that a group of heat pumps will be activated according to step S1. As shown in fig. 2, there are two conditions that will trigger the stride cut logic:
triggering the up-cut condition 1: temperature set point is P0Set a lower value PL=0.95P0Calculating the deviation between the measured value P and a lower value, sending the deviation to an integral controller, and triggering a switching condition to switch to a higher step when the integral quantity reaches the upper limit of the integral and the variation trend of the measured value is in a direction of continuously decreasing;
wherein, PLThe first threshold value is 0.95, the first coefficient is 0.95, and the differentiator is used for differentiating the temperature measured value P with time, the change trend of the measured value is continuously larger when the differentiated amount is larger than zero, and the change trend of the measured value is continuously smaller when the differentiated amount is smaller than zero.
Triggering the up-cut condition 2: setting a low binary value PLL=0.85P0When the measured value is lower than the low value, the current control deviation is larger, and the control is required to be immediately switched to a high step level;
wherein, PLLIs the second threshold, 0.85 is the second coefficient.
S4: step down cut logic
As shown in fig. 3, the logic to trigger the switch is as follows (switching one step lower then represents stopping a group of heat pumps):
trigger down-cut condition 1: temperature set point is P0Set a higher value PH=1.05P0Calculating the deviation between the measured value P and a higher value, sending the deviation to an integral controller, and triggering a switching condition to switch to a lower step when the integral quantity reaches the upper limit of the integral and the variation trend of the measured value is in a continuously increasing direction;
wherein, PHA third threshold value, 1.05 is a third coefficient, the differentiator is used for differentiating the temperature measured value P with time, and the change of the measured value is represented by the differential quantity being larger than zeroThe trend becomes larger, and the variation trend of the differential amount smaller than zero represents that the measurement value becomes smaller.
Triggering an undercut condition 2: setting a high binary value PHH=1.15P0When the measured value is higher than the high value, the current control deviation is larger, and the current control deviation needs to be immediately switched to a low step level;
wherein, PHHIs a fourth threshold value, and 1.15 is a fourth coefficient.
S5: switching interval setting
In order to avoid frequent step switching and frequent start and stop of the heat pump equipment, 1 minute of cooling time is needed to wait for each step switching process.
Example 2:
the embodiment 2 of the present invention provides a precisely adjusted air source heat pump group control system, including:
a data acquisition module configured to: acquiring a return water temperature measurement value of the air source heat pump group;
a step switching control module configured to: calculating the deviation between the return water temperature measurement value and the corresponding temperature threshold value, and performing control step switching control by combining the start-stop relation of the control step and the heat pump unit according to the integral quantity of the deviation and the variation trend of the return water temperature measurement value;
wherein, switching to a higher step level comprises:
the product of the first coefficient and the expected temperature is a first threshold value, the first coefficient is smaller than 1, the deviation between the acquired return water temperature measurement value and the first threshold value is input into an integrator, and when the integral quantity reaches the upper integral limit and the variation trend of the measurement value is continuously reduced, a switching condition is triggered to switch to a higher step;
and when the obtained return water temperature measurement value is smaller than the second threshold value, triggering a switching condition and directly switching to a high step.
Switching to a lower step level, comprising:
and when the integral quantity reaches the upper integral limit and the variation trend of the measured value is continuously increased, triggering a switching condition to switch to a lower step.
Switching to a lower step level, further comprising:
and when the obtained return water temperature measurement value is greater than the fourth threshold value, triggering a switching condition and directly switching to a low step level.
The working method of the system is the same as the control method of the quasi-regulated air source heat pump group provided in embodiment 1, and details are not repeated here.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A control method of an air source heat pump group with accurate adjustment is characterized by comprising the following processes:
acquiring a return water temperature measurement value of the air source heat pump group;
calculating the deviation between the return water temperature measurement value and the corresponding temperature threshold value, and performing control step switching control by combining the start-stop relation of the control step and the heat pump unit according to the integral quantity of the deviation and the variation trend of the return water temperature measurement value;
wherein, switching to a higher step level comprises:
the product of the first coefficient and the expected temperature is a first threshold value, the first coefficient is smaller than 1, the deviation between the acquired return water temperature measurement value and the first threshold value is input into an integrator, and when the integral quantity reaches the upper integral limit and the variation trend of the measurement value is continuously reduced, a switching condition is triggered to switch to a higher step;
and when the obtained return water temperature measurement value is smaller than the second threshold value, triggering a switching condition and directly switching to a high step.
2. The method of claim 1, wherein the control system is further configured to control the air source heat pump group,
each control step corresponds to different air source heat pump unit start-stop relations, and the higher the control step is, the more the number of the air source heat pump units is started.
3. The method of claim 1, wherein the control system is further configured to control the air source heat pump group,
the first coefficient is 0.95 and the second coefficient is 0.85.
4. The method of claim 1, wherein the control system is further configured to control the air source heat pump group,
switching to a lower step level, comprising:
and when the integral quantity reaches the upper integral limit and the variation trend of the measured value is continuously increased, triggering a switching condition to switch to a lower step.
5. The method of claim 4, wherein the control system is further configured to control the air source heat pump group,
switching to a lower step level, further comprising:
and when the obtained return water temperature measurement value is greater than the fourth threshold value, triggering a switching condition and directly switching to a low step level.
6. The method of claim 5, wherein the control system is further configured to control the air source heat pump group,
the third coefficient is 1.05 and the fourth coefficient is 1.15.
7. The method of claim 1, wherein the control system is further configured to control the air source heat pump group,
and setting preset cooling time in each step switching process.
8. A precision-tuned air source heat pump group control system, comprising:
a data acquisition module configured to: acquiring a return water temperature measurement value of the air source heat pump group;
a step switching control module configured to: calculating the deviation between the return water temperature measurement value and the corresponding temperature threshold value, and performing control step switching control by combining the start-stop relation of the control step and the heat pump unit according to the integral quantity of the deviation and the variation trend of the return water temperature measurement value;
wherein, switching to a higher step level comprises:
the product of the first coefficient and the expected temperature is a first threshold value, the first coefficient is smaller than 1, the deviation between the acquired return water temperature measurement value and the first threshold value is input into an integrator, and when the integral quantity reaches the upper integral limit and the variation trend of the measurement value is continuously reduced, a switching condition is triggered to switch to a higher step;
and when the obtained return water temperature measurement value is smaller than the second threshold value, triggering a switching condition and directly switching to a high step.
9. The precision regulated air source heat pump cluster control system of claim 8,
and when the integral quantity reaches the upper integral limit and the variation trend of the measured value is continuously increased, triggering a switching condition to switch to a lower step.
10. The precision regulated air source heat pump cluster control system of claim 8,
and when the obtained return water temperature measurement value is greater than the fourth threshold value, triggering a switching condition and directly switching to a low step level.
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