CN113739251A - Air source heat pump control method and system for overcoming large hysteresis - Google Patents
Air source heat pump control method and system for overcoming large hysteresis Download PDFInfo
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- CN113739251A CN113739251A CN202111050052.6A CN202111050052A CN113739251A CN 113739251 A CN113739251 A CN 113739251A CN 202111050052 A CN202111050052 A CN 202111050052A CN 113739251 A CN113739251 A CN 113739251A
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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
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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
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/04—Sensors
- F24D2220/042—Temperature sensors
Abstract
The invention provides an air source heat pump control method and system for overcoming large hysteresis, which are used for obtaining a return water temperature measured value and a return water temperature required set value of an air source heat pump; obtaining a static deviation index and a dynamic deviation index according to the acquired return water temperature measured value and the acquired return water temperature demand set value; according to the obtained static deviation index and dynamic deviation index and a preset control rule, a start-stop control instruction and start-stop interval time of the air source heat pump are obtained; according to the method, the advanced control of the starting and stopping of the air source heat pump unit is realized according to the change condition of the return water temperature, the large hysteresis characteristic of the original control object is overcome, and the better energy-saving operation is realized.
Description
Technical Field
The disclosure relates to the technical field of air source heat pumps, in particular to a control method and a control system for an air source heat pump capable of overcoming large hysteresis.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The air source heat pump is widely concerned as a low-carbon and environment-friendly central heating technology. A central heating air source heat pump system is usually composed of dozens or dozens of heat pump units, and the basic control mode is that a certain number of heat pump units are started when the temperature of return water is lower than a set value and stopped when the temperature of return water is higher than the set value according to the return water temperature, so that the purpose of meeting the heat supply requirement is achieved.
The inventor finds that because the flow of the whole thermodynamic system control object is long, the thermal inertia is large, and the thermodynamic system control object has the characteristic of large hysteresis, and a longer process is needed when the start-up or stop operation of the heat pump unit reflects the change of the return water temperature, the start-up and stop of the heat pump unit are controlled only by comparing the return water temperature with a set value, the control precision is not high enough, and the condition of resource waste exists in the start-up and stop process of the heat pump unit.
Disclosure of Invention
In order to solve the defects of the prior art, the air source heat pump control method and system for overcoming the large hysteresis are provided, the start and stop of the air source heat pump unit are controlled in advance according to the change condition of the return water temperature, the large hysteresis characteristic of the original control object is overcome, and better energy-saving operation is realized.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a first aspect of the present disclosure provides a method of controlling an air source heat pump to overcome large hysteresis.
An air source heat pump control method for overcoming large hysteresis comprises the following processes:
acquiring a backwater temperature measurement value and a backwater temperature demand set value of the air source heat pump;
obtaining a static deviation index and a dynamic deviation index according to the acquired return water temperature measured value and the acquired return water temperature demand set value;
and obtaining a start-stop control instruction and start-stop interval time of the air source heat pump according to the obtained static deviation index and dynamic deviation index and a preset control rule.
Further, obtaining a control deviation according to the difference value between the obtained return water temperature measurement value and the return water temperature demand set value;
and when the control deviation exceeds a preset control range, accumulating in a deviation accumulator, and taking an accumulation result of the deviation accumulator as a static deviation index.
Furthermore, in the accumulation process, if the deviation returns to the control range, the numerical value in the deviation accumulator is cleared, and accumulation is carried out after the deviation exceeds the control range again.
Further, obtaining a control deviation according to the difference value between the obtained return water temperature measurement value and the return water temperature demand set value;
subtracting the value of the control deviation after the current value of the control deviation and the control deviation pass through a first-order inertia link to obtain a differential value of the control deviation;
the average value of the differential values of the control deviation calculated a plurality of times is used as a dynamic deviation index.
Further, the preset control rule comprises: the first index fixed value, the second index fixed value and a first time fixed value, a second time fixed value and a third time fixed value which are increased in sequence;
when the static deviation index is less than or equal to the negative first index fixed value, and:
when the dynamic deviation index is less than or equal to a negative second index value, a shutdown instruction is sent, and the interval time is a first time fixed value;
when the dynamic deviation index is larger than a negative second index fixed value and smaller than a positive second index fixed value, a stop instruction is sent, and the interval time is a second time fixed value;
and when the dynamic deviation index is greater than or equal to the positive second index value, the control instruction is unchanged.
Further, when the static deviation indicator is greater than the negative first indicator constant and less than the positive first indicator constant, and:
when the dynamic deviation index is less than or equal to a negative second index fixed value, a shutdown instruction is sent, and the interval time is a third time fixed value;
when the dynamic deviation index is larger than a negative second index value and smaller than a positive second index value, the control instruction is unchanged;
and when the dynamic deviation index is greater than or equal to the positive second index fixed value, sending a starting-up instruction, wherein the interval time is a third time fixed value.
Further, when the static deviation indicator is greater than or equal to the positive first indicator constant, and:
when the dynamic deviation index is less than or equal to a negative second index value, the control instruction is unchanged;
when the dynamic deviation index is larger than a negative second index value and smaller than a positive second index value, a starting-up instruction is sent, and the interval time is a second time fixed value;
and when the dynamic deviation index is greater than or equal to the positive second index value, sending a starting-up instruction, wherein the interval time is a first time fixed value.
A second aspect of the present disclosure provides an air source heat pump control system that overcomes large hysteresis.
An air source heat pump control system for overcoming large hysteresis comprising:
a data acquisition module configured to: acquiring a backwater temperature measurement value and a backwater temperature demand set value of the air source heat pump;
a deviation indicator calculation module configured to: obtaining a static deviation index and a dynamic deviation index according to the acquired return water temperature measured value and the acquired return water temperature demand set value;
a start-stop control module configured to: and obtaining a start-stop control instruction and start-stop interval time of the air source heat pump according to the obtained static deviation index and dynamic deviation index and a preset control rule.
A third aspect of the present disclosure provides a computer readable storage medium having stored thereon a program which, when executed by a processor, implements the steps in the air source heat pump control method of overcoming large hysteresis as set forth in the first aspect of the present disclosure.
A fourth aspect of the present disclosure provides an electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, the processor implementing the steps in the air source heat pump control method for overcoming large hysteresis according to the first aspect of the present disclosure when executing the program.
Compared with the prior art, the beneficial effect of this disclosure is:
1. according to the method, the system, the medium or the electronic equipment, the start-stop advanced control of the air source heat pump unit is realized according to the change condition of the return water temperature, the large hysteresis characteristic of an original control object is overcome, and the better energy-saving operation of the air source heat pump is realized.
2. According to the method, the system, the medium or the electronic equipment, not only is the current value of the return water temperature considered, but also the change direction and the change range of the return water temperature are calculated according to the change condition of the return water temperature in the recent period of time, the starting time and the stopping time of the heat pump unit are reasonably controlled, the time interval of the starting and stopping operation of the heat pump unit is dynamically adjusted, and the advance and accurate control of the heat pump unit is realized.
3. The method, the system, the medium or the electronic equipment disclosed by the disclosure not only consider the static deviation of the return water temperature and the set value, but also consider the dynamic deviation of the return water temperature and the set value, reasonably formulate the start-up and stop instructions of the heat pump unit according to different combinations of the static deviation index and the dynamic deviation index, dynamically adjust the time interval of start-up and stop operations of the heat pump unit, and realize the advanced and accurate control of the heat pump unit.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic flow chart of an air source heat pump control method for overcoming large hysteresis provided in embodiment 1 of the present disclosure.
Fig. 2 is a schematic flow chart of a method for calculating a static deviation index according to embodiment 1 of the present disclosure.
Fig. 3 is a schematic flow chart of a method for calculating a dynamic deviation index according to embodiment 1 of the present disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 disclosure 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 example embodiments according to the present disclosure. 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 in the present disclosure may be combined with each other without conflict.
Example 1:
as shown in fig. 1, an embodiment 1 of the present disclosure provides an air source heat pump control method for overcoming large hysteresis, including the following processes:
acquiring a backwater temperature measurement value and a backwater temperature demand set value of the air source heat pump;
obtaining a static deviation index and a dynamic deviation index according to the acquired return water temperature measured value and the acquired return water temperature demand set value;
and obtaining a start-stop control instruction and start-stop interval time of the air source heat pump according to the obtained static deviation index and dynamic deviation index and a preset control rule.
Specifically, the method comprises the following steps:
s1: static deviation index K calculation
As shown in fig. 2, a measured value PV of the return water temperature is collected, a set value SP is set according to the user's demand, a control deviation is obtained by subtracting the set value SP from the set value SP, an allowable range of the control deviation is set, if the allowable range is exceeded, the control deviation is larger, and the control deviation is accumulated in a deviation accumulator.
In the accumulation process, if the deviation returns to the allowable range, the current control effect returns to the ideal range, so that the numerical value in the deviation accumulator is cleared, accumulation is carried out after the deviation exceeds the allowable range again, and the accumulation result obtained by the deviation accumulator is marked as the static deviation index.
S2: dynamic deviation indicator D calculation
As shown in fig. 3, a measured value PV of the return water temperature is collected, a set value SP is set according to the requirement of a user, the two values are subtracted to obtain a control deviation, and a differential value of the control deviation is obtained by subtracting a value of the control deviation after the current value of the control deviation and the control deviation pass through a first-order inertia link, wherein the differential value means a variation trend of the control deviation.
The inertia time constant of the first-order inertia link is set to 60 seconds in consideration of the large hysteresis of the air source heat pump system (the time constant can be adjusted according to specific working conditions by those skilled in the art, and the detailed description is omitted here).
In order to avoid the contingency caused by a single calculation, the differential value of the control deviation is calculated according to the result of the latest 12 times (a person skilled in the art can adjust the calculation times according to specific working conditions, and details are not repeated here), and a moving average value is taken and recorded as a dynamic deviation index.
S3: and (3) control strategy:
and generating final start-stop instructions and start-stop interval time by the expert rule controller according to the calculated static deviation index and dynamic deviation index, and transmitting the final start-stop instructions and start-stop interval time to each heat pump unit by the heat pump instruction distribution system.
The expert rules controller is set as follows:
1) setting a constant value D0Three intervals are used to distinguish the degree of deviation of the dynamic deviation index from the normal value.
2) Setting a constant value K0Three intervals are used to distinguish the degree of deviation of the static deviation index from the normal value.
3) Three fixed values T1 < T2 < T3 (adjustable T1, T2 and T3) are set to represent different start-stop interval time (fast, medium and slow).
4) The distribution of the static deviation index and the dynamic deviation index in different intervals is shown, and the output of the controller is shown in the following table:
example 2:
an embodiment 2 of the present disclosure provides an air source heat pump control system for overcoming large hysteresis, including:
a data acquisition module configured to: acquiring a backwater temperature measurement value and a backwater temperature demand set value of the air source heat pump;
a deviation indicator calculation module configured to: obtaining a static deviation index and a dynamic deviation index according to the acquired return water temperature measured value and the acquired return water temperature demand set value;
a start-stop control module configured to: and obtaining a start-stop control instruction and start-stop interval time of the air source heat pump according to the obtained static deviation index and dynamic deviation index and a preset control rule.
The working method of the system is the same as the control method of the air source heat pump for overcoming the large hysteresis provided by the embodiment 1, and the detailed description is omitted.
Example 3:
the embodiment 3 of the present disclosure provides a computer-readable storage medium, on which a program is stored, which when executed by a processor, implements the steps in the air source heat pump control method for overcoming large hysteresis as described in embodiment 1 of the present disclosure.
Example 4:
the embodiment 4 of the present disclosure provides an electronic device, which includes a memory, a processor, and a program stored in the memory and executable on the processor, and the processor executes the program to implement the steps in the air source heat pump control method for overcoming large hysteresis according to embodiment 1 of the present disclosure.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure 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 disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. 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 disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A control method for an air source heat pump for overcoming large hysteresis is characterized by comprising the following steps:
acquiring a backwater temperature measurement value and a backwater temperature demand set value of the air source heat pump;
obtaining a static deviation index and a dynamic deviation index according to the acquired return water temperature measured value and the acquired return water temperature demand set value;
and obtaining a start-stop control instruction and start-stop interval time of the air source heat pump according to the obtained static deviation index and dynamic deviation index and a preset control rule.
2. The air source heat pump control method for overcoming large hysteresis of claim 1,
obtaining a control deviation according to the difference value between the acquired return water temperature measurement value and the return water temperature demand set value;
and when the control deviation exceeds a preset control range, accumulating in a deviation accumulator, and taking an accumulation result of the deviation accumulator as a static deviation index.
3. The air source heat pump control method for overcoming large hysteresis of claim 2,
in the accumulation process, if the deviation returns to the control range, the numerical value in the deviation accumulator is cleared, and accumulation is carried out after the deviation exceeds the control range again.
4. The air source heat pump control method for overcoming large hysteresis of claim 1,
obtaining a control deviation according to the difference value between the acquired return water temperature measurement value and the return water temperature demand set value;
subtracting the value of the control deviation after the current value of the control deviation and the control deviation pass through a first-order inertia link to obtain a differential value of the control deviation;
the average value of the differential values of the control deviation calculated a plurality of times is used as a dynamic deviation index.
5. The air source heat pump control method for overcoming large hysteresis of claim 1,
presetting a control rule, comprising: the first index fixed value, the second index fixed value and a first time fixed value, a second time fixed value and a third time fixed value which are increased in sequence;
when the static deviation index is less than or equal to the negative first index fixed value, and:
when the dynamic deviation index is less than or equal to a negative second index value, a shutdown instruction is sent, and the interval time is a first time fixed value;
when the dynamic deviation index is larger than a negative second index fixed value and smaller than a positive second index fixed value, a stop instruction is sent, and the interval time is a second time fixed value;
and when the dynamic deviation index is greater than or equal to the positive second index value, the control instruction is unchanged.
6. The air source heat pump control method for overcoming large hysteresis of claim 1,
when the static deviation indicator is greater than the negative first indicator constant and less than the positive first indicator constant, and:
when the dynamic deviation index is less than or equal to a negative second index fixed value, a shutdown instruction is sent, and the interval time is a third time fixed value;
when the dynamic deviation index is larger than a negative second index value and smaller than a positive second index value, the control instruction is unchanged;
and when the dynamic deviation index is greater than or equal to the positive second index fixed value, sending a starting-up instruction, wherein the interval time is a third time fixed value.
7. The air source heat pump control method for overcoming large hysteresis of claim 1,
when the static deviation indicator is greater than or equal to the positive first indicator constant, and:
when the dynamic deviation index is less than or equal to a negative second index value, the control instruction is unchanged;
when the dynamic deviation index is larger than a negative second index value and smaller than a positive second index value, a starting-up instruction is sent, and the interval time is a second time fixed value;
and when the dynamic deviation index is greater than or equal to the positive second index value, sending a starting-up instruction, wherein the interval time is a first time fixed value.
8. An air source heat pump control system for overcoming large hysteresis comprising:
a data acquisition module configured to: acquiring a backwater temperature measurement value and a backwater temperature demand set value of the air source heat pump;
a deviation indicator calculation module configured to: obtaining a static deviation index and a dynamic deviation index according to the acquired return water temperature measured value and the acquired return water temperature demand set value;
a start-stop control module configured to: and obtaining a start-stop control instruction and start-stop interval time of the air source heat pump according to the obtained static deviation index and dynamic deviation index and a preset control rule.
9. A computer-readable storage medium, having a program stored thereon, where the program, when executed by a processor, is adapted to carry out the steps of a method of controlling an air-source heat pump to overcome large hysteresis according to any one of claims 1 to 7.
10. An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps in the method of air-source heat pump control for overcoming large hysteresis of any of claims 1-7.
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