CN114484935B - Heat pump unit and control method and control device thereof - Google Patents
Heat pump unit and control method and control device thereof Download PDFInfo
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- CN114484935B CN114484935B CN202111663740.XA CN202111663740A CN114484935B CN 114484935 B CN114484935 B CN 114484935B CN 202111663740 A CN202111663740 A CN 202111663740A CN 114484935 B CN114484935 B CN 114484935B
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- 238000000034 method Methods 0.000 title claims abstract description 116
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 103
- 230000008569 process Effects 0.000 claims abstract description 67
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 40
- 230000008859 change Effects 0.000 claims abstract description 16
- 238000012163 sequencing technique Methods 0.000 claims description 11
- 238000010977 unit operation Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 5
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a heat pump unit, a control method and a control device thereof, wherein the method comprises the following steps: after the unit is started, acquiring a time difference t1 from the starting of the first compressor to the beginning of the change of the return water temperature; determining a unit loading temperature deviation threshold delta T1 and a unit unloading temperature deviation threshold delta T2 according to the time difference T1; during operation of the unit, the following loading and/or unloading are performed: when the backwater temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold delta T1, controlling the unit to execute a loading starting process; and when the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, controlling the unit to execute the load shedding shutdown process. By adopting the invention, the technical problem of low water temperature control precision of the traditional heat pump unit can be solved.
Description
Technical Field
The invention belongs to the technical field of heat pump systems, and particularly relates to a heat pump unit and a control method and a control device thereof.
Background
The heat pump unit is widely used as a unit device at present, and a refrigerant circulation system is formed by a compressor, a condenser, an electronic expansion valve, an evaporator and the like. The water supply pipeline exchanges heat with the condenser, and the heat released by the condenser is utilized to provide hot water for the tail end of the water supply pipeline.
In order to meet the temperature requirement of the terminal water supply, a multi-connected heat pump unit is generally adopted, and the heat is provided by utilizing the multi-unit. For the multi-connected heat pump unit, the loading and unloading of the unit are required to be adjusted according to the heat supply demand during operation. In the prior art, the relation between the temperature deviation between the return water temperature of the unit and the set temperature and the deviation threshold value is mostly adopted, so that the starting or stopping of the unit is controlled, and the loading or unloading is realized.
The temperature deviation threshold is generally a preset value, and is determined and built in the heat pump unit when the heat pump unit leaves the factory. However, when the heat pump unit is actually installed and used, the distances between the tail end of the water supply pipeline and the heat pump unit are different, and the heat pump unit is provided with water supply pipelines with different lengths. Water supply pipelines with different distances have larger influence on water temperature control precision, and the larger the distance is, the larger the inertness of water temperature change at the tail end is, and the water return temperature of the unit is lagged. If a fixed temperature deviation threshold is adopted, the actual condition of a unit system cannot be well adapted, and the unit water temperature control precision is low.
Disclosure of Invention
The invention aims to provide a control method and a control device for a heat pump unit, which solve the technical problem of low water temperature control precision of the existing heat pump unit.
In order to achieve the aim of the invention, the control method of the heat pump unit provided by the invention is realized by adopting the following technical scheme:
a heat pump unit control method, the said heat pump unit includes a plurality of unit systems, each unit system includes at least one compressor; the method comprises the following steps:
after the unit is started, acquiring a time difference t1 from the starting of the first compressor to the beginning of the change of the return water temperature;
determining a unit loading temperature deviation threshold delta T1 and a unit unloading temperature deviation threshold delta T2 according to the time difference T1: Δt1= -a1×t1+b1, Δt2= -a2×t1+b2; parameters a1, b1, a2, b2 are all known positive numbers, and Δt1 > 0 ℃, Δt2 > 0 ℃;
during operation of the unit, the following loading and/or unloading are performed:
when the backwater temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold delta T1, controlling the unit to execute a loading starting process;
and when the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, controlling the unit to execute the load shedding shutdown process.
In one preferred embodiment, the method further comprises:
in the running process of the unit, the number n of the current running unit systems is obtained in real time;
determining a current unit start time interval deltat 1 :Δt 1 =k1*t q /n；t q For a preset total start-up time, k1 is a known adjustment coefficient, and k1 is greater than 0;
when the control unit executes the loading starting process, the control unit starts the time interval delta t according to the current unit 1 Loading and starting.
In one preferred embodiment, the method further comprises:
determining a current unit shutdown time interval Δt 2 :Δt 2 =k2*t t /n；t t For a preset total downtime, k2 is a known adjustment factor, and k2 > 0;
when the control unit executes the load shedding shutdown process, the control unit controls the load shedding shutdown process according to the timeTime interval delta t of shutdown of front unit 2 And (5) load shedding and stopping.
In one preferred embodiment, the method further comprises:
and after receiving a unit shutdown instruction, controlling all the unit systems in an operating state to shutdown according to the current unit shutdown time interval determined last time.
In one preferred embodiment, the control unit executes a loading start-up process, specifically including:
determining the current accumulated running time of each unit system in a shutdown state, sequencing the current accumulated running times of all the unit systems in the shutdown state, and controlling the unit systems in the shutdown state to start up sequentially according to the sequence from the small current accumulated running time to the large current accumulated running time.
In one of the preferred embodiments, the control unit performs a load shedding shutdown process, specifically comprising:
determining the current accumulated running time of each unit system in the running state, sequencing the current accumulated running times of all the unit systems in the running state, and controlling the unit systems in the running state to stop sequentially according to the sequence from the big to the small of the current accumulated running time.
In order to achieve the above object, the heat pump unit control device provided by the invention is realized by adopting the following technical scheme:
the heat pump unit control device comprises a plurality of unit systems, wherein each unit system comprises at least one compressor; the device comprises:
the time difference acquisition unit is used for acquiring a time difference t1 from the start of the first compressor to the change of the return water temperature after the unit is started;
the temperature deviation threshold determining unit is used for determining a unit loading temperature deviation threshold delta T1 and a unit unloading temperature deviation threshold delta T2 according to the time difference T1: Δt1= -a1×t1+b1, Δt2= -a2×t1+b2; parameters a1, b1, a2, b2 are all known positive numbers, and Δt1 > 0 ℃, Δt2 > 0 ℃;
the backwater temperature acquisition unit is used for acquiring backwater temperature Tin of the unit;
the control unit is at least used for executing the following loading and/or unloading during the running process of the unit: when the backwater temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold delta T1, controlling the unit to execute a loading starting process; and when the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, controlling the unit to execute the load shedding shutdown process.
In one preferred embodiment, the apparatus further comprises:
the current operable unit system quantity acquisition unit is used for acquiring the current operable unit system quantity n in real time in the unit operation process;
a current unit start time interval determining unit for determining a current unit start time interval Δt 1 :Δt 1 =k1*t q /n；t q For a preset total start-up time, k1 is a known adjustment coefficient, and k1 is greater than 0;
when the control unit controls the unit to execute the loading starting process, the control unit controls the unit to start the time interval delta t according to the current unit 1 Loading and starting;
a current unit shutdown time interval determining unit for determining a current unit shutdown time interval Δt 2 :Δt 2 =k2*t t /n；t t For a preset total downtime, k2 is a known adjustment factor, and k2 > 0;
when the control unit controls the unit to execute the load shedding shutdown process, the control unit controls the unit to stop according to the current unit shutdown time interval delta t 2 And (5) load shedding and stopping.
In one preferred embodiment, the apparatus further comprises:
the first current accumulated running time determining unit is used for determining the first current accumulated running time of each unit system in a shutdown state in the unit running process;
the second current accumulated running time determining unit is used for determining the second current accumulated running time of each unit system in the running state in the unit running process;
the control unit is further used for sequencing the first current accumulated running time of all the unit systems in the shutdown state when the control unit executes the loading startup process, and controlling the unit systems in the shutdown state to be started sequentially according to the sequence from the small first current accumulated running time to the large first accumulated running time;
and the control unit is also used for sequencing the second current accumulated running time of all the unit systems in the running state when the control unit executes the load shedding shutdown process, and controlling the unit systems in the running state to shutdown sequentially according to the sequence of the second current accumulated running time from big to small.
Another object of the present invention is to provide a heat pump unit, which includes the heat pump unit control device described above.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the heat pump unit control method and the control device, the time difference from the starting of the first compressor to the beginning of the change of the return water temperature is used as the parameter for measuring the length of the pipeline between the heat pump unit and the water supply end, the loading temperature deviation threshold value and the unloading temperature deviation threshold value of the unit are determined based on the time difference, the loading and unloading temperature deviation values are further determined based on the two temperature deviation threshold values, the loading start-up or unloading stop control is executed, the influence of low water temperature control precision caused by matching pipelines with different lengths of the unit is eliminated, and the water temperature control precision of the heat pump unit is improved.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a first embodiment of a heat pump unit control method according to the present invention;
FIG. 2 is a schematic flow chart of a second embodiment of a heat pump unit control method according to the present invention;
FIG. 3 is a schematic flow chart of a third embodiment of a heat pump unit control method according to the present invention;
FIG. 4 is a schematic view of a first embodiment of a heat pump unit control device according to the present invention;
FIG. 5 is a schematic view of a second embodiment of a heat pump unit control device according to the present invention;
fig. 6 is a schematic structural view of a third embodiment of a heat pump unit control device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.
It should be noted that, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the technical solutions are not combined, and are not within the scope of protection claimed by the present invention.
The multi-connected heat pump unit mostly adopts the relation between the temperature deviation between the return water temperature of the unit and the set temperature and the deviation threshold value to control the starting or stopping of the unit, so as to realize loading or unloading. In the prior art, the temperature deviation threshold is generally a preset value, and when the heat pump unit leaves the factory, the temperature deviation threshold is already determined and built in the unit. When the heat pump unit is actually installed and used, the distances between the tail end of the water supply pipeline and the heat pump unit are different, the water supply pipelines with different lengths are provided, the water temperature control precision is greatly influenced by the water supply pipelines with different lengths, and if a fixed temperature deviation threshold value is adopted, the water temperature control precision of the unit is low because the water temperature deviation threshold value is not suitable for the actual condition of the unit system. In order to solve the technical problem in the prior art, the invention creatively proposes that the time difference from the start of the first compressor to the beginning of the change of the return water temperature is taken as a parameter for measuring the length of a pipeline between the heat pump unit and the water supply end, and the temperature deviation value for loading and unloading is determined based on the time difference, so that the temperature deviation value can be well adapted to the actual condition of the unit, and the water temperature control precision of the unit is improved.
Fig. 1 is a schematic flow chart of a first embodiment of a control method of a heat pump unit according to the present invention. In this embodiment, the heat pump unit includes a plurality of unit systems, which form a multi-split unit, and each unit system includes at least one compressor.
As shown in fig. 1, this embodiment employs the following procedure to achieve control of the unit.
Step 101: after the unit is started, the time difference from the starting of the first compressor to the beginning of the change of the return water temperature is obtained.
After the machine set is started, the machine set systems are sequentially started. The specific process of starting the unit system after starting up can be realized by adopting the prior art.
After the start-up, the starting time of the first compressor is obtained, the time when the change of the backwater temperature is detected is also obtained, and then the time difference between the two times is calculated and recorded as t1. The size of the time difference corresponds to the distance between the unit and the water supply end, namely the length of the water supply pipeline, and the longer the length of the water supply pipeline is, the smaller the time difference is. Therefore, the water supply line length can be reflected based on the time difference.
Step 102: and determining a unit loading temperature deviation threshold value and a unit unloading temperature deviation threshold value according to the time difference t1.
Specifically, the determining mode of the unit loading temperature deviation threshold delta T1 is as follows: Δt1= -a1×t1+b1; the method for determining the unit load shedding temperature deviation threshold delta T2 is as follows: Δt2= -a2×t1+b2. The parameters a1, b1, a2 and b2 are all known positive numbers, are obtained by research personnel through comprehensive consideration of theoretical analysis, experimental test, simulation and the like, and are built in the unit. Moreover, Δt1 > 0 ℃, Δt2 > 0 ℃.
The unit loading temperature deviation threshold value delta T1 and the unit unloading temperature deviation threshold value delta T2 determined by adopting the mode are inversely proportional to the time difference T1, namely, the longer the water supply pipeline is, the larger the time difference T1 is, the smaller the unit loading temperature deviation threshold value delta T1 and the unit unloading temperature deviation threshold value delta T2 are, so that the longer the water supply pipeline is, the unit loading and unloading control of the unit is performed in advance, and the problem of large unit temperature control deviation caused by water temperature inertia due to the length of the waterway pipeline is solved.
Step 103: and controlling the unit to execute loading and/or unloading based on the unit loading temperature deviation threshold and the unit unloading temperature deviation threshold.
After determining the unit loading temperature deviation threshold Δt1 and the unit unloading temperature deviation threshold Δt2 in step 102, during operation of the unit, loading and/or unloading of the unit will be performed by:
and when the backwater temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold delta T1, namely, tin is smaller than Ts-delta T1, the unit is controlled to execute the loading starting process until the backwater temperature Tin reaches or is close to the set water temperature Ts. The unit loading start-up is controlled, namely the number of started unit systems is increased, and the specific control process can be realized by adopting the prior art.
When the backwater temperature Tin of the unit is larger than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, namely, tin is larger than Ts+delta T2, the unit is controlled to execute the load shedding shutdown process until the backwater temperature Tin reaches or approaches to the set water temperature Ts. The unit load shedding and shutdown are controlled, namely the number of started unit systems is reduced, and the specific control process can be realized by adopting the prior art.
By adopting the control method of the embodiment, the time difference from the starting of the first compressor to the beginning of the change of the return water temperature is used as a parameter for measuring the length of the pipeline between the heat pump unit and the water supply end, the loading temperature deviation threshold value and the unloading temperature deviation threshold value of the unit are determined based on the time difference, the loading and unloading temperature deviation values are further determined based on the two temperature deviation threshold values, the control of loading startup or unloading shutdown is executed, the influence of low water temperature control precision caused by the matching of the unit with pipelines of different lengths is eliminated, and the accuracy of water temperature control of the heat pump unit is improved.
Fig. 2 is a schematic flow chart of a second embodiment of the control method of the heat pump unit according to the present invention. In this embodiment, the heat pump unit includes a plurality of unit systems, which form a multi-split unit, and each unit system includes at least one compressor.
As shown in fig. 2, this embodiment employs the following procedure to achieve control of the unit.
Step 201: after the unit is started, the time difference from the starting of the first compressor to the beginning of the change of the return water temperature is obtained.
Step 202: and determining a unit loading temperature deviation threshold value and a unit unloading temperature deviation threshold value according to the time difference t1.
The specific implementation means, principles and effects of step 201 and step 202 are described with reference to the corresponding steps in fig. 1.
Step 203: and (3) operating the unit, and obtaining the number of the current operable unit systems.
And in the running process of the unit, acquiring the number n of the current running unit systems in real time. Typically, the number of currently operable crew systems is the number of crew systems other than the failed crew system.
Step 204: and determining a current unit starting time interval and a current unit stopping time interval.
Current unit start time interval Δt 1 The determination mode of (a) is as follows: Δt (delta t) 1 =k1* t q /n；t q For a preset total start-up time, k1 is a known adjustment factor, and k1 > 0. In some preferred embodiments, 50 < k1 < 70.
Current unit shutdown time interval Δt 2 The determination mode of (a) is as follows: Δt (delta t) 2 =k2*t t /n；t t For a preset total downtime, k2 is a known adjustment factor, and k2 > 0. In some preferred embodiments, 50 < k1 < 70.
According to the method, the unit starting time structure and the unit stopping time interval are determined according to the number of the current operable unit systems, and when the number of the operable unit systems is larger, the starting time interval and the stopping time interval are smaller, so that each unit system can be started or stopped rapidly, the starting speed of the unit system is improved, and the water temperature control precision is improved; the smaller the number of the operable unit systems, the larger the start time interval and the stop time interval are, so that the speed of starting or stopping each unit system is slowed down, and the stability of the water temperature in the water supply pipeline is ensured.
Step 205: judging whether Tin is less than Ts-delta T1. If yes, go to step 206; otherwise, step 207 is performed.
That is, whether the return water temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold deltat 1 is judged, and different controls are executed according to the judgment result.
Step 206: and controlling the unit to execute a loading starting process, and controlling the unit to load and start according to the current unit starting time interval. Then, step 203 is continued.
When the return water temperature Tin of the unit is less than the difference between the set water temperature Ts and the loading temperature deviation threshold Δt1, the loading start-up process is executed by the unit, that is, the number of opened unit systems needs to be increased, in step 205. And controlling the loading start of the unit system according to the current unit start time interval determined in the step 204.
Then, the step 203 is continuously executed, the loaded running machine set system is controlled to continuously run, and circulation is continuously carried out according to the process of the step 203 and the following steps.
Step 207: judging whether Tin is more than Ts+DeltaT2 or not. If yes, go to step 208; otherwise, step 209 is performed.
If step 205 determines that the return water temperature Tin of the unit is not less than the difference between the set water temperature Ts and the loading temperature deviation threshold deltat 1, then the loading start-up process is not required to be executed; and further judging whether the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, and executing different controls according to the judging result.
Step 208: and controlling the unit to execute the load shedding and stopping process, and controlling the unit to carry out load shedding and stopping according to the current unit stopping time interval. Then, step 203 is continued.
If step 207 determines that the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load-shedding temperature deviation threshold Δt2, the unit is controlled to execute the load-shedding shutdown process, i.e. the number of opened unit systems needs to be reduced. Moreover, the crew system load shedding shutdown is controlled according to the current crew shutdown time interval determined in step 204.
Then, the step 203 is continuously executed, the operation unit system after load shedding is controlled to continuously operate, and circulation is continuously carried out according to the process of the step 203 and the following steps.
Step 209: the current state of the unit is kept unchanged. Then, step 203 is continued.
If the backwater temperature Tin of the unit is not smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold value delta T1 and is not larger than the sum of the set water temperature Ts and the unloading temperature deviation threshold value delta T2, the current state of the unit is kept unchanged, and the loading or unloading control is executed.
Then, the step 203 is continuously executed, the operation unit system after load shedding is controlled to continuously operate, and circulation is continuously carried out according to the process of the step 203 and the following steps.
Fig. 3 shows a schematic flow chart of a third embodiment of the control method of the heat pump unit of the present invention. In this embodiment, the heat pump unit includes a plurality of unit systems, which form a multi-split unit, and each unit system includes at least one compressor.
As shown in fig. 3, this embodiment employs the following procedure to achieve control of the unit.
Step 301: after the unit is started, the time difference from the starting of the first compressor to the beginning of the change of the return water temperature is obtained.
Step 302: and determining a unit loading temperature deviation threshold value and a unit unloading temperature deviation threshold value according to the time difference t1.
Step 303: and (3) operating the unit, and obtaining the number of the current operable unit systems.
Step 304: and determining a current unit starting time interval and a current unit stopping time interval.
Step 305: judging whether Tin is less than Ts-delta T1. If yes, go to step 306; otherwise, step 307 is performed.
The specific implementation means, principles and effects of steps 301 to 305 are described with reference to the corresponding steps in fig. 2.
Step 306: and determining the current accumulated running time of each unit system in the shutdown state, and controlling the unit to load and start according to the current unit starting time interval and the current accumulated running time execution sequence. Then, go to step 310.
When it is determined in step 305 that the return water temperature Tin of the unit is less than the difference between the set water temperature Ts and the loading temperature deviation threshold Δt1, the loading start-up process is performed by the unit, that is, the number of unit systems to be started is increased. And controlling the loading start of the unit system according to the current unit start time interval determined in the step 304. And, the machine set system is loaded and started in sequence according to the following method:
determining the current accumulated running time of each machine set system in the shutdown state, sequencing the current accumulated running times of all the machine set systems in the shutdown state, and controlling the machine set systems in the shutdown state to start up sequentially according to the sequence from the small to the large of the current accumulated running time. The machine set system with less accumulated running time is started and loaded firstly, and the machine set system with more accumulated running time is started and loaded later, so that the working time of the machine set system is balanced, and the safety and the reliability and the service life of the whole machine set are ensured.
Step 307: judging whether Tin is more than Ts+DeltaT2 or not. If yes, go to step 308; otherwise, step 309 is performed.
Step 308: and determining the current accumulated running time of each unit system in the running state, and controlling the unit to perform sequence load shedding and stopping according to the current unit stopping time interval and the current accumulated running time. Then, go to step 310.
If step 307 determines that the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load-shedding temperature deviation threshold Δt2, the unit is controlled to execute the load-shedding shutdown process, that is, the number of opened unit systems needs to be reduced. Further, the crew system de-load shutdown is controlled according to the current crew shutdown time interval determined in step 304. And, the following method is also used for executing sequential load shedding shutdown on the unit system:
determining the current accumulated running time of each running unit system, sequencing the current accumulated running times of all running unit systems, and controlling the running unit systems to stop sequentially according to the sequence from big to small of the current accumulated running time. The machine set system with more accumulated running time is firstly stopped for load shedding, and the machine set system with less accumulated running time is stopped for load shedding, so that the working time of the machine set system is balanced, and the safety and the reliability and the service life of the whole machine set are ensured.
Step 309: the current state of the unit is kept unchanged. Then, go to step 310.
If the backwater temperature Tin of the unit is not smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold value delta T1 and is not larger than the sum of the set water temperature Ts and the unloading temperature deviation threshold value delta T2, the current state of the unit is kept unchanged, and the loading or unloading control is executed.
310: and judging whether a shutdown instruction is received. If yes, go to step 311; otherwise, go to step 303.
If no shutdown instruction is received, when loading or unloading is completed or the state is unchanged, the process goes to step 303, the unit system is controlled to continue to operate, and circulation is continued according to the process of step 303 and the subsequent steps.
Step 311: and controlling all the unit systems in the running state to stop according to the last determined current unit stop time interval.
If a shutdown command is received, all the unit systems in the running state are controlled to shutdown, and the unit systems are controlled to shutdown according to the current unit shutdown time interval determined last time.
In other preferred embodiments, the running crew systems are also controlled to be sequentially shut down in order of from large to small in terms of the current accumulated running time of the running crew systems.
Fig. 4 is a schematic structural view of a first embodiment of the heat pump unit control device according to the present invention. In this embodiment, the heat pump unit includes a plurality of unit systems, which form a multi-split unit, and each unit system includes at least one compressor. The control device of this embodiment includes the structural units, the functions of the structural units, and the connection relationships therebetween, as described in detail below.
As shown in fig. 4, the control device includes:
the time difference obtaining unit 41 is configured to obtain, after the unit is started, a time difference t1 from when the first compressor is started to when the return water temperature starts to change.
The temperature deviation threshold determining unit 42 is configured to determine a unit loading temperature deviation threshold Δt1 and a unit unloading temperature deviation threshold Δt2 according to the time difference T1.
And the backwater temperature obtaining unit 43 is used for obtaining the backwater temperature Tin of the unit.
The control unit 44 is at least configured to perform the following loading and/or unloading during operation of the unit: when the return water temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold delta T1, controlling the unit to execute a loading start-up process; when the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, the unit is controlled to execute the load shedding shutdown process.
The control device with the structure runs corresponding software programs to execute corresponding functions, and performs heat pump unit control according to the process of the embodiment of the heat pump unit control method and the preferred embodiment of the heat pump unit control method in fig. 1, so as to achieve the corresponding technical effects with the embodiment of the heat pump unit control method in fig. 1 and the preferred embodiment of the heat pump unit control method.
Fig. 5 is a schematic structural view of a second embodiment of the heat pump unit control device according to the present invention. In this embodiment, the heat pump unit includes a plurality of unit systems, which form a multi-split unit, and each unit system includes at least one compressor. The control device of this embodiment includes the structural units, the functions of the structural units, and the connection relationships therebetween, as described in detail below.
As shown in fig. 5, the control device includes:
the time difference obtaining unit 51 is configured to obtain, after the unit is started, a time difference t1 from when the first compressor is started to when the return water temperature starts to change.
The temperature deviation threshold determining unit 52 is configured to determine a unit loading temperature deviation threshold Δt1 and a unit unloading temperature deviation threshold Δt2 according to the time difference T1.
And the backwater temperature acquisition unit 53 is used for acquiring the backwater temperature Tin of the unit.
The current operable unit system number obtaining unit 55 is configured to obtain, in real time, the current operable unit system number n during the unit operation.
A current unit start time interval determining unit 56 for determining a current unit start time interval Δt 1 。
A current unit downtime interval determination unit 57 for determining a current unit downtime interval Δt 2 。
The control unit 54 is at least configured to perform the following loading and/or unloading during operation of the unit: when the return water temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold delta T1, controlling the unit to execute a loading start-up process; when the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, controlling the unit to execute the load shedding shutdown process; and is also used for controlling the unit to start time interval delta t according to the current unit when the unit is controlled to execute the loading start process 1 Loading and starting; and is also used for controlling the unit to stop according to the current unit stop time interval delta t when the control unit executes the load shedding stop process 2 And (5) load shedding and stopping.
The control device with the structure runs corresponding software programs to execute corresponding functions, and performs heat pump unit control according to the process of the embodiment of the heat pump unit control method and the preferred embodiment of the heat pump unit control method in fig. 2, so as to achieve the corresponding technical effects with the embodiment of the heat pump unit control method in fig. 2 and the preferred embodiment of the heat pump unit control method.
Fig. 6 is a schematic structural view of a third embodiment of the heat pump unit control device according to the present invention. In this embodiment, the heat pump unit includes a plurality of unit systems, which form a multi-split unit, and each unit system includes at least one compressor. The control device of this embodiment includes the structural units, the functions of the structural units, and the connection relationships therebetween, as described in detail below.
As shown in fig. 6, the control device includes:
the time difference obtaining unit 61 is configured to obtain, after the unit is started, a time difference t1 from when the first compressor is started to when the return water temperature starts to change.
The temperature deviation threshold determining unit 62 is configured to determine a unit loading temperature deviation threshold Δt1 and a unit unloading temperature deviation threshold Δt2 according to the time difference T1.
And the backwater temperature acquisition unit 63 is used for acquiring the backwater temperature Tin of the unit.
The current operable unit system number obtaining unit 65 is configured to obtain, in real time, the current operable unit system number n during the unit operation.
A current unit start time interval determining unit 66 for determining a current unit start time interval Δt 1 。
A current unit shutdown time interval determining unit 67 for determining a current unit shutdown time interval Δt 2 。
A first current accumulated operating time determining unit 68 is configured to determine a first current accumulated operating time of each of the crew systems in the shutdown state during the crew operation.
A second current accumulated operating time determining unit 69 for determining a second current accumulated operating time of each of the unit systems in an operating state during the unit operation.
The control unit 64 is configured to perform the following loading and/or unloading during the operation of the unit: when the return water temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold delta T1, controlling the unit to execute a loading start-up process; when the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, controlling the unit to execute the load shedding shutdown process; and is also used for controlling the unit to start time interval delta t according to the current unit when the unit is controlled to execute the loading start process 1 Loading and starting; and is also used for controlling the unit to stop according to the current unit stop time interval delta t when the control unit executes the load shedding stop process 2 Load shedding and stopping; and is also used for controlling the unit to execute the loading starting processSequencing the first current accumulated running time of the machine set systems in the shutdown state, and controlling the machine set systems in the shutdown state to start up sequentially according to the sequence from the small to the large of the first current accumulated running time; and the control unit is also used for sequencing the second current accumulated running time of all the running unit systems when the control unit executes the load shedding shutdown process, and controlling the running unit systems to sequentially shutdown according to the sequence of the second current accumulated running time from big to small.
The control device with the structure runs corresponding software programs to execute corresponding functions, and performs heat pump unit control according to the process of the embodiment of the heat pump unit control method and the preferred embodiment of the heat pump unit control method in fig. 3, so as to achieve the corresponding technical effects with the embodiment of the heat pump unit control method in fig. 3 and the preferred embodiment of the heat pump unit control method.
The heat pump unit control device of each embodiment is applied to the heat pump unit, and can improve the accuracy of water temperature control of the heat pump unit.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. The heat pump unit control method is characterized in that the heat pump unit comprises a plurality of unit systems, and each unit system comprises at least one compressor; the method comprises the following steps:
after the unit is started, acquiring a time difference t1 from the starting of the first compressor to the beginning of the change of the return water temperature;
determining a unit loading temperature deviation threshold delta T1 and a unit unloading temperature deviation threshold delta T2 according to the time difference T1: Δt1= -a1×t1+b1, Δt2= -a2×t1+b2; parameters a1, b1, a2, b2 are all known positive numbers, and Δt1 > 0 ℃, Δt2 > 0 ℃;
during operation of the unit, the following loading and/or unloading are performed:
when the backwater temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold delta T1, controlling the unit to execute a loading starting process;
and when the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, controlling the unit to execute the load shedding shutdown process.
2. The heat pump unit control method according to claim 1, characterized in that the method further comprises:
in the running process of the unit, the number n of the current running unit systems is obtained in real time;
determining a current unit start time interval deltat 1 :Δt 1 =k1*t q /n；t q For a preset total start-up time, k1 is a known adjustment coefficient, and k1 is greater than 0;
when the control unit executes the loading starting process, the control unit starts the time interval delta t according to the current unit 1 Loading and starting.
3. The heat pump unit control method according to claim 2, characterized in that the method further comprises:
determining a current unit shutdown time interval Δt 2 :Δt 2 =k2*t t /n；t t For a preset total downtime, k2 is a known adjustment factor, and k2 > 0;
when the control unit executes the load shedding shutdown process, the control unit controls the unit to stop according to the current unit shutdown time interval delta t 2 And (5) load shedding and stopping.
4. A heat pump unit control method according to claim 3, characterized in that the method further comprises:
and after receiving a unit shutdown instruction, controlling all the unit systems in an operating state to shutdown according to the current unit shutdown time interval determined last time.
5. A heat pump unit control method according to any one of claims 1 to 3, wherein,
the control unit executes a loading starting process, and specifically comprises the following steps:
determining the current accumulated running time of each unit system in a shutdown state, sequencing the current accumulated running times of all the unit systems in the shutdown state, and controlling the unit systems in the shutdown state to start up sequentially according to the sequence from the small current accumulated running time to the large current accumulated running time.
6. A heat pump unit control method according to any one of claims 1 to 3, wherein,
the control unit executes the load shedding shutdown process and specifically comprises the following steps:
determining the current accumulated running time of each unit system in the running state, sequencing the current accumulated running times of all the unit systems in the running state, and controlling the unit systems in the running state to stop sequentially according to the sequence from the big to the small of the current accumulated running time.
7. The heat pump unit control device is characterized by comprising a plurality of unit systems, wherein each unit system comprises at least one compressor; the device comprises:
the time difference acquisition unit is used for acquiring a time difference t1 from the start of the first compressor to the change of the return water temperature after the unit is started;
the temperature deviation threshold determining unit is used for determining a unit loading temperature deviation threshold delta T1 and a unit unloading temperature deviation threshold delta T2 according to the time difference T1: Δt1= -a1×t1+b1, Δt2= -a2×t1+b2; parameters a1, b1, a2, b2 are all known positive numbers, and Δt1 > 0 ℃, Δt2 > 0 ℃;
the backwater temperature acquisition unit is used for acquiring backwater temperature Tin of the unit;
the control unit is at least used for executing the following loading and/or unloading during the running process of the unit: when the backwater temperature Tin of the unit is smaller than the difference between the set water temperature Ts and the loading temperature deviation threshold delta T1, controlling the unit to execute a loading starting process; and when the return water temperature Tin of the unit is greater than the sum of the set water temperature Ts and the load shedding temperature deviation threshold delta T2, controlling the unit to execute the load shedding shutdown process.
8. The heat pump assembly control device of claim 7, further comprising:
the current operable unit system quantity acquisition unit is used for acquiring the current operable unit system quantity n in real time in the unit operation process;
a current unit start time interval determining unit for determining a current unit start time interval Δt 1 :Δt 1 =k1*t q /n；t q For a preset total start-up time, k1 is a known adjustment coefficient, and k1 is greater than 0;
when the control unit controls the unit to execute the loading starting process, the control unit controls the unit to start the time interval delta t according to the current unit 1 Loading and starting;
a current unit shutdown time interval determining unit for determining a current unit shutdown time interval Δt 2 :Δt 2 =k2*t t /n；t t For a preset total downtime, k2 is a known adjustment factor, and k2 > 0;
when the control unit controls the unit to execute the load shedding shutdown process, the control unit controls the unit to stop according to the current unit shutdown time interval delta t 2 And (5) load shedding and stopping.
9. The heat pump unit control device according to claim 7 or 8, characterized in that the device further comprises:
the first current accumulated running time determining unit is used for determining the first current accumulated running time of each unit system in a shutdown state in the unit running process;
the second current accumulated running time determining unit is used for determining the second current accumulated running time of each unit system in the running state in the unit running process;
the control unit is further used for sequencing the first current accumulated running time of all the unit systems in the shutdown state when the control unit executes the loading startup process, and controlling the unit systems in the shutdown state to be started sequentially according to the sequence from the small first current accumulated running time to the large first accumulated running time;
and the control unit is also used for sequencing the second current accumulated running time of all the unit systems in the running state when the control unit executes the load shedding shutdown process, and controlling the unit systems in the running state to shutdown sequentially according to the sequence of the second current accumulated running time from big to small.
10. A heat pump unit, characterized in that it comprises a heat pump unit control device according to any one of the preceding claims 7 to 9.
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