CA3219831A1

CA3219831A1 - Method and apparatus for controlling air conditioning unit, electronic device, and readable storage medium

Info

Publication number: CA3219831A1
Application number: CA3219831A
Authority: CA
Inventors: Zhenshan LI; Zhihua Yang; Bin He; Qianyi ZHAO; Xuyang WANG; Hongxiang Zhang
Original assignee: Midea Group Co Ltd; Chongqing Midea General Refrigeration Equipment Co Ltd
Current assignee: Midea Group Co Ltd; Chongqing Midea General Refrigeration Equipment Co Ltd
Priority date: 2021-12-01
Filing date: 2022-12-01
Publication date: 2023-06-08
Also published as: WO2023098833A1; CN116202189A

Abstract

Provided are a method and apparatus for controlling an air conditioning unit, an electronic device, and a readable storage medium. The method includes: determining a load adjustment target value of the air conditioning unit; obtaining an operation condition parameter of each of the plurality of compressors, and calculating first optimal efficiency and a first workload of each of the plurality of compressors based on the operation condition parameter; obtaining second optimal efficiency and a second workload of the air conditioning unit by performing cross-permutation and combination calculation on the first optimal efficiency and the first workload of each of the plurality of compressors; determining target optimal efficiency and a target workload from the second optimal efficiency and the second workload of a plurality of air conditioning units based on the load adjustment target value; and controlling, based on the target optimal efficiency and the target workload, the air conditioning unit to perform a refrigeration operation or a heating operation.

Description

CA Application CPST Ref: 41665/00002

2 CONDITIONING UNIT, ELECTRONIC DEVICE, AND READABLE

3 STORAGE MEDIUM

4 CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] This application claims priorities to Chinese Patent Application No.
202111453483.7 6 filed on December 01, 2021 and entitled "METHOD AND APPARATUS FOR
CONTROLLING
7 AIR CONDITIONING UNIT, ELECTRONIC DEVICE, AND READABLE STORAGE
8 M EDI UM ," the entire disclosure of which is incorporated herein by reference.

[0002] The present disclosure relates to the technical field of compressors, and more 11 particular, to a method and apparatus for controlling an air conditioning unit, an electronic device, 12 and a readable storage medium.

14 [0003] At present, a multi-compressor water chilling (heat pump) unit in the industry is typically composed of a plurality of air conditioners of a same model or a same specification.
16 This design can allow the unit to control each compressor in a simple manner. A typical method 17 for controlling the air conditioning unit is to approximately consider that for compressors (not all 18 compressors) that are operating, each compressor has a same refrigerating capacity and operation 19 efficiency according to a principle of equal power or current. When loading the unit, each compressor is loaded with a same power ratio or a same current ratio until a power or current of 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 the operating compressor reaches its full capacity, and then the unloaded compressors are started.
2 Similarly, when unloading the unit, each compressor is unloaded (reduced) by an equal power or 3 current until a minimum refrigerating capacity limit of the compressor has been reached, at 4 which point one of the operating compressors is closed.
[0004] However, two obvious defects occur in the above method for controlling the air 6 conditioning unit described above. First, when a plurality of compressors employed by a water 7 chilling (heat pump) unit has different models and specifications, this control method cannot well 8 perform refrigerating capacity distribution of each compressor and determination of an increase 9 or decrease in the number of compressors in operation. Second, although the related control method may allow a refrigerating capacity of the unit to satisfy requirements of a user's water 11 system by adjusting an operation parameter of the compressor, this control method lacks a basis 12 on a principle of optimal compressor efficiency, resulting in poor energy efficiency of the air 13 conditioning unit.

[0005] In view of this, the present disclosure provides a method and apparatus for controlling 16 method an air conditioning unit, an electronic device, and a readable storage medium, to at least 17 adapt to a situation where various compressors in the air conditioning unit have different types 18 and specifications. Moreover, energy efficiency of the air conditioning unit can be improved.
19 [0006] According to some embodiments of the present disclosure, provided is a method for controlling an air conditioning unit. The method is applied in the air conditioning unit. The air 21 conditioning unit may include a plurality of compressors. The method may include: determining 22 a load adjustment target value of the air conditioning unit; obtaining an operation condition 23 parameter of each of the plurality of compressors, and calculating first optimal efficiency and a 24 first workload of each of the plurality of compressors based on the operation condition parameter, in which a maximum of the first workload represents a maximum refrigerating capacity or a 26 maximum heating capacity of the compressor at the first optimal efficiency, and a minimum of 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 the first workload represents a minimum refrigerating capacity or a minimum heating capacity of 2 the compressor at the first optimal efficiency; obtaining second optimal efficiency and a second 3 workload of the air conditioning unit by performing cross-permutation and combination 4 calculation on the first optimal efficiency and the first workload of each of the plurality of compressors, in which a maximum of the second workload represents a maximum refrigerating

6 capacity or a maximum heating capacity of the air conditioning unit at the second optimal

7 efficiency, and a minimum of the second workload represents a minimum refrigerating capacity

8 or a minimum heating capacity of the air conditioning unit at the first optimal efficiency;

9 determining target optimal efficiency and a target workload from the second optimal efficiency and the second workload of the air conditioning unit based on the load adjustment target value;
11 and controlling, based on the target optimal efficiency and the target workload, the air 12 conditioning unit to perform a refrigeration operation or a heating operation.
13 [0007] In some embodiments of the present disclosure, the air conditioning unit may include 14 a controller of the air conditioning unit, the plurality of compressors, a sensor of the plurality of compressors, a controller of the plurality of compressors, and an actuator of the plurality of 16 compressors.
17 [0008] In some embodiments of the present disclosure, said determining the load adjustment 18 target value of the air conditioning unit may include: determining, by the controller of the air 19 conditioning unit, the load adjustment target value of the air conditioning unit based on a target water temperature and a change curve of a current water temperature.
21 [0009] In some embodiments of the present disclosure, said obtaining the operation condition 22 parameter of each of the plurality of compressors may include:
obtaining, by the sensor of the 23 plurality of compressors, the operation condition parameter of the compressor.
24 [0010] In some embodiments of the present disclosure, the controller of the compressor has a performance database pre-stored thereon. The performance database may include a 26 correspondence between the operation condition parameter of the compressor and the first 27 optimal efficiency and the first workload of the compressor. Said calculating the first optimal 28 efficiency and the first workload of each of the plurality of compressors based on the operation 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 condition parameter may include: inputting the operation condition parameter into the 2 performance database and outputting the first optimal efficiency and the first workload of the 3 compressor.
4 [0011] In some embodiments of the present disclosure, said obtaining the second optimal efficiency and the second workload of the air conditioning unit by performing cross-permutation 6 and combination calculation on the first optimal efficiency and the first workload of each of the 7 plurality of compressors may include: performing, by the controller of the air conditioning unit, 8 the cross-permutation and combination calculation on the first optimal efficiency and the first 9 workload of each of the plurality of compressors to obtain the second optimal efficiency and the second workload of the air conditioning unit.
11 [0012] In some embodiments of the present disclosure, said determining the target optimal 12 efficiency and the target workload from the second optimal efficiency and the second workload 13 of the air conditioning unit based on the load adjustment target value may include: determining 14 third optimal efficiency and a third workload from the second optimal efficiency and the second workload of the air conditioning unit, in which a minimum of the third workload is smaller than 16 the load adjustment target value, and the load adjustment target value is smaller than a maximum 17 of the third workload; and determining a maximum of the third optimal efficiency as the target 18 optimal efficiency and a third workload corresponding to the target optimal efficiency as the 19 target workload.
[0013] In some embodiments of the present disclosure, the maximum of the third optimal 21 efficiency corresponds to a plurality of third workloads. Said determining the third workload 22 corresponding to the target optimal efficiency as the target workload may include: determining a 23 compressor operation time corresponding to the plurality of third workloads corresponding to the 24 maximum of the third optimal efficiency; and determining one of the plurality of third workloads corresponding to a minimum of the compressor operation time as the target workload.
26 [0014] In some embodiments of the present disclosure, said determining the target optimal 27 efficiency and the target workload from the second optimal efficiency and the second workload 28 of the air conditioning unit based on the load adjustment target value may include: calculating, 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 when there is no third workload, a difference between the minimum of the second workload and 2 the load adjustment target value; determining a second workload corresponding to a minimum of 3 the difference as the target workload; and determining second optimal efficiency corresponding 4 to the target workload as the target optimal efficiency.
[0015] In some embodiments of the present disclosure, said controlling, based on the target 6 optimal efficiency and the target workload, the air conditioning unit to perform the refrigeration 7 operation or heating operation may include: controlling the actuator of the compressor based on 8 the target optimal efficiency and the target workload, to allow each of the plurality of 9 compressors to perform the refrigeration operation or heating operation.
[0016] In some embodiments of the present disclosure, the air conditioning unit is a water 11 chilling unit or a heat pump unit.
12 [0017] According to other embodiments of the present disclosure, further provided is an 13 apparatus for controlling an air conditioning unit. The apparatus is applied in the air conditioning 14 unit. The air conditioning unit may include a plurality of compressors.
The apparatus may include: a load adjustment target value determination module configured to determine a load 16 adjustment target value of the air conditioning unit; a first optimal efficiency and first workload 17 calculation module configured to obtain an operation condition parameter of each of the plurality 18 of compressors and calculate first optimal efficiency and a first workload of each of the plurality 19 of compressors based on the operation condition parameter, in which a maximum of the first workload represents a maximum refrigerating capacity or a maximum heating capacity of the 21 compressor at the first optimal efficiency, and a minimum of the first workload represents a 22 minimum refrigerating capacity or a minimum heating capacity of the compressor at the first 23 optimal efficiency; a second optimal efficiency and second workload calculation module 24 configured to obtain second optimal efficiency and a second workload of the air conditioning unit by performing cross-permutation and combination calculation on the first optimal efficiency 26 and the first workload of each of the plurality of compressors, in which a maximum of the 27 second workload represents a maximum refrigerating capacity or a maximum heating capacity of 28 the air conditioning unit at the second optimal efficiency, and a minimum of the second workload 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 represents a minimum refrigerating capacity or a minimum heating capacity of the air 2 conditioning unit at the first optimal efficiency; a target optimal efficiency and target workload 3 calculation module configured to determine target optimal efficiency and a target workload from 4 the second optimal efficiency and the second workload of the air conditioning unit based on the load adjustment target value; and an air conditioning unit operation module configured to control, 6 based on the target optimal efficiency and the target workload, the air conditioning unit to 7 perform a refrigeration operation or a heating operation.
8 [0018] In some embodiments of the present disclosure, the air conditioning unit may include 9 a controller of the air conditioning unit, the plurality of compressors, a sensor of the plurality of compressors, a controller of the plurality of compressors, and an actuator of the plurality of 11 compressors.
12 [0019] In some embodiments of the present disclosure, the load adjustment target value 13 determination module may be further configured to determine, by the controller of the air 14 conditioning unit to determine, based on a target water temperature and a change curve of a current water temperature, the load adjustment target value of the air conditioning unit.
16 [0020] In some embodiments of the present disclosure, the first optimal efficiency and first 17 workload calculation module may be configured to obtain, by the sensor of the plurality of 18 compressors, the operation condition parameter of the compressor.
19 [0021] In some embodiments of the present disclosure, the controller of the compressor may have a performance database pre-stored thereon. The performance database may include a 21 correspondence between the operation condition parameter of the compressor and the first 22 optimal efficiency and the first workload of the compressor. The first optimal efficiency and first 23 workload calculation module may be further configured to input the operation condition 24 parameter into the performance database and output the first optimal efficiency and the first workload of the compressor.
26 [0022] In some embodiments of the present disclosure, the second optimal efficiency and 27 second workload calculation module may be further configured to perform, by the controller of 28 the air conditioning unit, the cross-permutation and combination calculation on the first optimal 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 efficiency and the first workload of each of the plurality of compressors to obtain the second 2 optimal efficiency and the second workload of the air conditioning unit.
3 [0023] In some embodiments of the present disclosure, the target optimal efficiency and 4 target workload calculation module may be further configured to:
determine third optimal efficiency and a third workload from the second optimal efficiency and the second workload of 6 the air conditioning unit, in which a minimum of the third workload is smaller than the load 7 adjustment target value, and the load adjustment target value is smaller than a maximum of the 8 third workload; and determine a maximum of the third optimal efficiency as the target optimal 9 efficiency and a third workload corresponding to the target optimal efficiency as the target workload.
11 [0024] According to yet another embodiment of the present disclosure, provided is an 12 electronic device. The electronic device includes a processor and a memory. The memory has 13 computer-executable instructions stored thereon. The computer-executable instruction is 14 executable by the processor. The processor is configured to implement, when executing the computer-executable instruction, the method for controlling the air conditioning unit as described 16 above.
17 [0025] According to still yet another embodiment of the present disclosure, provided is a 18 computer-readable storage medium. The computer-readable storage medium has computer-19 executable instructions thereon. The computer-executable instruction, when invoked and executed by a processor, causes the processor to implement the method for controlling the air 21 conditioning unit as described above.

23 [0026] In order to clearly explain technical solutions according to the specific 24 implementations of the present disclosure or in the related art, drawings used in the description of the specific implementations or the related art are briefly introduced below. Obviously, the 26 drawings described below are merely some implementations of the present disclosure. Based on 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 these drawings, other drawings can be obtained by those skilled in the art without creative effort.
2 [0027] FIG. 1 is a schematic diagram of a dual-compressor water-cooled water chilling (heat 3 pump) unit system according to some embodiments of the present disclosure.
4 [0028] FIG. 2 is a flowchart of a method for controlling an air conditioning unit according to some embodiments of the present disclosure.
6 [0029] FIG. 3 is a flowchart of another method for controlling an air conditioning unit 7 according to some embodiments of the present disclosure.
8 [0030] FIG. 4 is a schematic diagram of a principle of a control system for an air 9 conditioning unit according to some embodiments of the present disclosure.
[0031] FIG. 5 is a logical schematic diagram of a method for controlling an air conditioning 11 unit according to some embodiments of the present disclosure.
12 [0032] FIG. 6 is a schematic diagram of a compressor performance database and an 13 operation principle according to some embodiments of the present disclosure.
14 [0033] FIG. 7 is a schematic structural diagram of an apparatus for controlling an air conditioning unit according to some embodiments of the present disclosure.
16 [0034] FIG. 8 is a schematic structural diagram of an electronic device according to some 17 embodiments of the present disclosure.

19 [0035] In order to make the objects, technical solutions, and advantages of the present disclosure more apparent, technical solutions of the present disclosure will be clearly and 21 completely described below in combination with accompanying drawings.
Obviously, the 22 embodiments described below are only a part of the embodiments of the present disclosure, 23 rather than all of the embodiments. Based on the embodiments of the present disclosure, other 24 embodiments obtained by those of ordinary skill in the art without creative labor shall fall within the scope of the present disclosure.
26 [0036] At present, referring to a schematic diagram of a dual-compressor water-cooled water 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 chilling (heat pump) unit system, a multi-compressor water chilling (heat pump) unit in the 2 industry is generally composed of a plurality of air conditioners of a same model or a same 3 specification, that is, a compressor 1 and a compressor 2 in FIG. 1 have the same model and 4 specification. This design can allow the unit to control each of the plurality of compressors in a simple manner. A typical method for controlling the air conditioning unit in the industry is to 6 approximately consider that for compressors (not all compressors) that are operating, each 7 compressor has a same refrigerating capacity and operation efficiency according to a principle of 8 equal power or current. When loading the unit, each compressor is loaded with a same power 9 ratio or a same current ratio until a power or current of the operating compressor reaches its full capacity, and then the unloaded compressors are started. Similarly, when unloading the unit, each 11 compressor is unloaded (reduced) by an equal power or current until a minimum refrigerating 12 capacity limit of the compressor has been reached, at which point one of the operating 13 compressors is closed.
14 [0037] However, two obvious defects occur in the above method for controlling the air conditioning unit described above. First, when a plurality of compressors employed by a water 16 chilling (heat pump) unit has different models and specifications, this control method cannot well 17 perform refrigerating capacity distribution of each compressor and determination of an increase 18 or decrease in the number of compressors in operation. Second, although the related control 19 method may allow a refrigerating capacity of the unit to satisfy requirements of a user's water system by adjusting an operation parameter of the compressor, this control method lacks a basis 21 on a principle of optimal compressor efficiency, resulting in poor energy efficiency of the air 22 conditioning unit. Based on this, the embodiments of the present disclosure provide a method 23 and apparatus for controlling an air conditioning unit, an electronic device, and a readable 24 storage medium, and specifically relate to an optimal energy efficiency method for controlling the multi-compressor water chilling (heat pump) unit.
26 [0038] In order to facilitate understanding of the embodiments, firstly, a method for 27 controlling an air conditioning unit according to the embodiments of the present disclosure will 28 be described below in detail.

1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 [0039] The method for controlling the air conditioning unit according to the embodiments of 2 the present disclosure will be described in detail below with reference to the accompanying 3 drawings.
4 [0040] An embodiment of the present disclosure provides a method for controlling an air conditioning unit. The method is applied in the air conditioning unit. The air conditioning unit 6 may include a plurality of compressors. FIG. 2 shows a flowchart of a method for controlling an 7 air conditioning unit. As illustrated in FIG. 2, the method for controlling the air conditioning unit 8 may include operations at blocks S202 to S210.
9 [0041] At block S202, a load adjustment target value of the air conditioning unit is determined.
11 [0042] The air conditioning unit according to the embodiments of the present disclosure may 12 include the plurality of compressors. The compressors may have a same model or a same 13 specification, or may have different models and specifications. The compressors may be used for 14 refrigerating or heating. Correspondingly, the above air conditioning unit may be a water chilling unit or a heat pump unit.
16 [0043] In addition, the load adjustment target value of the air conditioning unit may be 17 understood as a user's desired refrigerating capacity or heating capacity of the air conditioning 18 unit during its operation. The user may input a target water temperature. The load adjustment 19 target value of the air conditioning unit may be calculated based on the target water temperature inputted by the user.
21 [0044] At block S204, an operation condition parameter of each of the plurality of 22 compressors is obtained, and first optimal efficiency and a first workload of each of the plurality 23 of compressors are calculated based on the operation condition parameter.
24 [0045] In addition, the operation condition parameter of the compressor may include parameters such as a temperature, humidity, and current of the compressor. A
maximum of the 26 first workload represents a maximum refrigerating capacity or a maximum heating capacity of 27 the compressor at the first optimal efficiency. A minimum of the first workload represents a 28 minimum refrigerating capacity or a minimum heating capacity of the compressor at the first 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 optimal efficiency.
2 [0046] At block S206, second optimal efficiency and a second workload of the air 3 conditioning unit are obtained by performing cross-permutation and combination calculation on 4 the first optimal efficiency and the first workload of each of the plurality of compressors.
[0047] In addition, a maximum of the second workload represents a maximum refrigerating 6 capacity or a maximum heating capacity of the air conditioning unit at the second optimal 7 efficiency. A minimum of the second workload represents a minimum refrigerating capacity or a 8 minimum heating capacity of the air conditioning unit at the first optimal efficiency.
9 [0048] After the first optimal efficiency and the first workload of each of the plurality of compressors are determined, permutation and combination may be performed on the first optimal 11 efficiency and the first workload of each of the plurality of compressors in various manners, to 12 obtain the second optimal efficiency and the second workload of the air conditioning unit.
13 [0049] At block S208, target optimal efficiency and a target workload are determined from 14 the second optimal efficiency and the second workload of the air conditioning unit based on the load adjustment target value.
16 [0050] Based on a predetermined screening rule, one best efficiency and one best workload 17 may be determined from the second optimal efficiency and the second workload of each of the 18 plurality of air conditioning units based on the load adjustment target value, and the best 19 efficiency and the best workload are referred to as the target optimal efficiency and the target workload. The above-mentioned screening rule may be set based on an optimal efficiency 21 principle of the compressor. In this way, a control strategy for multi-compressor refrigerating 22 capacity distribution and compressor number addition and reduction is carried out. Therefore, the 23 compressor can be at the optimal efficiency, and the air conditioning unit can be at optimal 24 energy efficiency.
[0051] At block S210, the air conditioning unit is controlled based on the target optimal 26 efficiency and the target workload to perform a refrigeration operation or a heating operation.
27 [0052] After the target optimal efficiency and the target workload are determined, it is 28 possible to control, based on the target optimal efficiency and the target workload, the 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 compressor in the air conditioning unit to operate or close, to control the air conditioning unit to 2 perform a refrigeration operation or a heating operation.
3 [0053] According to the method and apparatus for controlling the air conditioning unit, the 4 electronic device, and the readable storage medium according to the embodiments of the present disclosure, the first optimal efficiency and the first workload of each compressor are calculated 6 based on the operation condition parameter. The second optimal efficiency and the second 7 workload of the air conditioning unit are determined based on the first optimal efficiency and the 8 first workload of each compressor. The target optimal efficiency and the target workload are 9 determined from the second optimal efficiency and the second workload.
Moreover, the air conditioning unit is controlled, based on the target optimal efficiency and the target workload, to 11 perform a refrigeration operation or a heating operation.
12 [0054] Another method for controlling the air conditioning unit according to the 13 embodiments of the present disclosure will be described in detail below with reference to the 14 accompanying drawings.
[0055] This embodiment provides another method for controlling the air conditioning unit.
16 The method is implemented on the basis of the above embodiments and focuses on descriptions 17 for specific implementation steps of determining the target optimal efficiency and the target 18 workload from the second optimal efficiency and the second workload of each of the plurality of 19 air conditioning units based on the load adjustment target value. A
flowchart of another method for controlling the air conditioning unit is illustrated in FIG. 3. As illustrated in FIG. 3, the 21 method for controlling the air conditioning unit in this embodiment includes operation at block 22 S302.
23 [0056] At block S302, a load adjustment target value of the air conditioning unit is 24 determined.
[0057] In some embodiments, the air conditioning unit may include a controller of the air 26 conditioning unit (also referred to as a unit controller), a plurality of compressors, a sensor of the 27 plurality of compressors, a controller of the plurality of compressors, and an actuator of the 28 plurality of compressors. FIG. 4 illustrates a schematic diagram of a principle of a control system 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 for an air conditioning unit. Referring to FIG. 4, the air conditioning unit in FIG. 4 includes n 2 compressors. Each of the n compressors correspondingly has a controller, an actuator, and a 3 sensor. The controller of the air conditioning unit is in a communication connection with the 4 controller of each of then compressors.
[0058] In addition, a sensor of a first compressor to nth compressor may collect parameters 6 such as a pressure, a temperature, and a current. An actuator of the first compressor to the nth 7 compressor may perform compressor capacity adjustment and compressor rotational speed 8 adjustment. A controller of the first compressor to the nth compressor has stored thereon a 9 database or a mathematical model (function, equation, association, or the like) between a refrigerating (heating) capacity and efficiency and actuator action parameters of the respective 11 compressor in different operation conditions.
12 [0059] In addition, when the compressors have the same model and specification or the 13 number of compressors is small, it is possible to dispense with the compressor controller. Instead, 14 all of correlation relationships among functions, software, and databases of the compressor controller and the sensor and actuator of the compressor are integrated into the unit controller. In 16 addition, all of correlation relationships among functions, software and databases of the unit 17 controller and a sensor and actuator of the unit actuator are integrated into the compressor 18 controller. Therefore, the unit controller can be removed.
19 [0060] In some embodiments, the load adjustment target value of the air conditioning unit may be determined by the controller of the air conditioning unit based on a target water 21 temperature and a change curve of a current water temperature.
22 [0061] FIG. 5 shows a logical schematic diagram of a method for controlling an air 23 conditioning unit. Referring to FIG. 5, the unit controller may calculate a load adjustment target 24 value of unit refrigeration (heating) based on a target water temperature set by the user and a change curve of a current actual water temperature.
26 [0062] At block S304, an operation condition parameter of each of the plurality of 27 compressors is obtained. First optimal efficiency and a first workload of each of the plurality of 28 compressors are calculated based on the operation condition parameter.

1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 [0063] In some embodiments, the sensor of the plurality of compressors may obtain the 2 operation condition parameter of the compressor. The controller of the compressor may input the 3 operation condition parameter into the performance database to output the first optimal 4 efficiency and the first workload of the compressor.
[0064] As illustrated in FIG. 5, the controller of the first compressor to the nth compressor 6 can obtain the operation condition parameter of the compressor by calculating parameters 7 collected by the corresponding sensor and actuator. Since the performance database is pre-stored 8 by the controller of the compressor, based on an actual operation condition parameter of the 9 compressor as an input, the optimal efficiency of the compressor and a maximum refrigerating (heating) capacity and a minimum refrigerating (heating) capacity of the compressor at the 11 optimal efficiency are calculated according to the performance database in the compressor 12 controller, i.e., the first optimal efficiency and the first workload.
13 [0065] In addition, reference may be made to a schematic diagram of a compressor 14 performance database and an operation principle illustrated in FIG. 6.
As illustrated in FIG. 6, the compressor may operate between the maximum of the first workload and the minimum of the 16 first workload at the optimal efficiency.
17 [0066] At block S306, second optimal efficiency and a second workload of the air 18 conditioning unit are obtained by performing cross-permutation and combination calculation on 19 the first optimal efficiency and the first workload of each of the plurality of compressors.
[0067] In some embodiments, the controller of the air conditioning unit may obtain the 21 second optimal efficiency and the second workload of the air conditioning unit by performing 22 cross-permutation and combination calculation on the first optimal efficiency and the first 23 workload of each of the plurality of compressors.
24 [0068] As illustrated in FIG. 5, after the unit controller receives the optimal efficiency and the maximum refrigerating (heating) capacity and minimum refrigerating (heating) capacity 26 uploaded by the controller of each compressor, the cross-permutation and combination 27 calculation is performed on numbers and serial numbers of compressors that are operating, to 28 obtain optimal unit efficiency and a maximum refrigerating (heating) capacity and minimum 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 refrigerating (heating) capacity at the optimal unit efficiency under various operation 2 combination of the compressors.
3 [0069] In addition, the above cross-permutation and combination may be a weighted 4 calculation. For example, first optimal efficiency of the first compressor is 85%, and a first workload of the first compressor is 500-700, so a weight is 83%; first optimal efficiency of a 6 second compressor is 83%, and a first workload of the second compressor is 200-4700, so a 7 weight is 300. Therefore, it is possible to obtain that the second optimal efficiency of the air 8 conditioning unit = (85% x 600 +83% x 300)/900 = 84.33%, the minimum of the second 9 workload = (500 x 600 +200 x 300)/900=400, and the maximum of the second workload= (500 x 700 +200 x 2700)/900=988.89.
11 [0070] At block S308, third optimal efficiency and a third workload are determined from the 12 second optimal efficiency and the second workload of the air conditioning unit. A minimum of 13 the third workload is smaller than the load adjustment target value.
Moreover, the load 14 adjustment target value is smaller than a maximum of the third workload;
and [0071] At block S310, a maximum of the third optimal efficiency is determined as the target 16 optimal efficiency. Moreover, a third workload corresponding to the target optimal efficiency is 17 determined as the target workload.
18 [0072] The embodiments of the present disclosure may provide a manner of multi-level 19 screening of the target workload. In a first-level condition screening, only a compressor operation combination (i.e., the third optimal efficiency and the third workload) is remained in 21 which a minimum refrigerating (heating) capacity at the unit optimal efficiency < the load 22 adjustment target value of the unit < a maximum refrigerating (heating) capacity at the unit 23 optimal efficiency, and then sorting is performed from a high efficiency value to a low optimal 24 efficiency value of the unit. Finally, the highest optimal efficiency is an optimal solution of an optimal method for controlling unit energy efficiency.
26 [0073] When the optimal solution of the first-level condition screening is not unique (i.e., the 27 maximum of the third optimal efficiency corresponds to a plurality of third workloads), a second-28 level condition screening is carried out. In the second-level condition screening, a compressor 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 operation time corresponding to the plurality of third workloads corresponding to the maximum 2 of the third optimal efficiency is determined, and one of the plurality of third workloads 3 corresponding to a minimum of the compressor operation time is determined as the target 4 workload. When there are two or more optimal solutions, a screening condition is an operation combination with a "minimum" operation duration of the compressor, thereby ensuring a 6 balanced service life of each compressor.
7 [0074] When the optimal solution of the first-level condition screening is 0 (i.e., there is no 8 third workload), the second-level condition screening is further performed. In the second-level 9 condition screening, when there is no third workload, a difference between the minimum of the second workload and the load adjustment target value is calculated. A second workload 11 corresponding to a minimum of the difference is determined as the target workload. Second 12 optimal efficiency corresponding to the target workload is determined as the target optimal 13 efficiency.
14 [0075] When the optimal solution is 0, in order to ensure the user's refrigerating (heating) capacity demand, an operation combination is performed in which the load adjustment target 16 value of the unit is smaller than the minimum refrigerating (heating) capacity at the optimal 17 efficiency of the unit and the minimum refrigerating (heating) capacity at the optimal efficiency 18 of the unit minus an overall target value of unit load adjustment is equal to minimum min.
19 [0076] At block S312, the air conditioning unit is controlled based on the target optimal efficiency and the target workload to perform the refrigeration operation or the heating operation.
21 [0077] In some embodiments, the actuator of the compressor may be controlled based on the 22 target optimal efficiency and the target workload, to allow each of the plurality of compressors to 23 perform the refrigeration operation or the heating operation.
24 [0078] Generally, when the compressor operates in its optimal efficiency interval, the compressor operates with good reliability and safety. In this way, stability of the unit is improved, 26 and a risk of compressor failure is lowered. Therefore, the method according to the embodiments 27 of the present disclosure can not only improve operation energy efficiency of the unit and 28 achieve energy conservation and emission reduction, but also improve stability of the unit and 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 reduce the risk of failure of the compressor.
2 [0079] In the method according to the embodiments of the present disclosure, for the multi-3 compressor water chilling (heat pump) unit, regardless of whether the model and specification 4 and the performance characteristics of the plurality of compressors in the air conditioning unit are the same, the refrigerating capacity that should be reached by each compressor may be well 6 calculated and allocated. Moreover, it is possible to perform control on an increase and decrease 7 in the number of compressors in operation.
8 [0080] In the method according to the embodiments of the present disclosure, the 9 permutation and combination calculation of various compressors at the optimal efficiency may be performed, and the optimal solution may be determined on the premise of satisfying the user's 11 requirements of the refrigeration (heating) capacity based on the actual operation condition of 12 each compressor. In this way, the multi-compressor water chilling (heat pump) unit can operate 13 in an optimal energy efficiency state during the load adjustment.
Therefore, power consumption 14 of the unit is saved, and energy conservation and emission reduction of the building is achieved.
[0081] When the compressor operates in its optimal efficiency interval, the compressor 16 operates with good reliability and safety. Therefore, the above method according to the 17 embodiments of the present disclosure improves the stability of the unit and reduces the risk of 18 the failure of the compressor.
19 [0082] An apparatus for controlling an air conditioning unit provided according to the embodiments of the present disclosure will be described in detail below with reference to the 21 accompanying drawings.
22 [0083] Corresponding to the above method embodiments, an embodiment of the present 23 disclosure provides an apparatus for controlling an air conditioning unit. FIG. 7 shows a 24 schematic structural diagram of an apparatus for controlling an air conditioning unit. Referring to FIG. 7, the apparatus is applied in the air conditioning unit. The air conditioning unit may 26 include a plurality of compressors. The apparatus for controlling the air conditioning unit may 27 include a load adjustment target value determination module 71, a first optimal efficiency and 28 first workload calculation module 72, a second optimal efficiency and second workload 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 calculation module 73, a target optimal efficiency and target workload calculation module 74, 2 and an air conditioning unit operation module 75.
3 [0084] The load adjustment target value determination module 71 is configured to determine 4 a load adjustment target value of the air conditioning unit.
[0085] The first optimal efficiency and first workload calculation module 72 is configured to 6 obtain an operation condition parameter of each of the plurality of compressors and calculate 7 first optimal efficiency and a first workload of each compressor based on the operation condition 8 parameter. A maximum of the first workload represents a maximum refrigerating capacity or a 9 maximum heating capacity of the compressor at the first optimal efficiency. A minimum of the first workload represents a minimum refrigerating capacity or a minimum heating capacity of the 11 compressor at the first optimal efficiency.
12 [0086] The second optimal efficiency and second workload calculation module 73 is 13 configured to obtain second optimal efficiency and a second workload of the air conditioning 14 unit by performing cross-permutation and combination calculation on the first optimal efficiency and the first workload of each of the plurality of compressors. A maximum of the second 16 workload represents a maximum refrigerating capacity or a maximum heating capacity of the air 17 conditioning unit at the second optimal efficiency. A minimum of the second workload represents 18 a minimum refrigerating capacity or a minimum heating capacity of the air conditioning unit at 19 the first optimal efficiency.
[0087] The target optimal efficiency and target workload calculation module 74 is configured 21 to determine target optimal efficiency and a target workload from the second optimal efficiency 22 and the second workload of the air conditioning unit based on the load adjustment target value.
23 [0088] The air conditioning unit operation module 75 is configured to control, based on the 24 target optimal efficiency and the target workload, the air conditioning unit to perform a refrigeration operation or a heating operation.
26 [0089] With the apparatus for controlling the air conditioning unit according to the 27 embodiments of the present disclosure, the first optimal efficiency and the first workload of each 28 of the plurality of compressors are calculated based on the operation condition parameter. The 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 second optimal efficiency and the second workload of the air conditioning unit are obtained by 2 performing cross-permutation and combination calculation on the first optimal efficiency and the 3 first workload of each of the plurality of compressors. The target optimal efficiency and a target 4 workload are determined from the second optimal efficiency and the second workload, and the air conditioning unit is controlled based on the target optimal efficiency and the target workload 6 to perform the refrigeration operation or the heating operation.
7 [0090] In the apparatus, regardless of whether the model and specification and the 8 performance characteristics of the plurality of compressors in the air conditioning unit are the 9 same, the refrigerating capacity or heating capacity that should be reached by each compressor may be well calculated and allocated. Moreover, it is possible to perform control on an increase 11 and decrease in the number of compressors in operation. Further, the permutation and 12 combination calculation of various compressors at the optimal efficiency may be performed, and 13 the optimal solution may be determined on the premise of satisfying the user's requirements of 14 the refrigeration (heating) capacity based on the actual operation condition of each compressor.
In this way, the multi-compressor water chilling (heat pump) unit can operate in an optimal 16 energy efficiency state during the load adjustment. Therefore, power consumption of the unit is 17 saved, and energy conservation and emission reduction of the building is achieved.
18 [0091] The air conditioning unit may include a controller of the air conditioning unit, the 19 plurality of compressors, a sensor of the plurality of compressors, a controller of the plurality of compressors, and an actuator of the plurality of compressors.
21 [0092] The load adjustment target value determination module may be further configured to 22 determine, by the controller of the air conditioning unit, based on a target water temperature and 23 a change curve of a current water temperature, the load adjustment target value of the air 24 conditioning unit.
[0093] The first optimal efficiency and first workload calculation module may be configured 26 to obtain, by the sensor of the plurality of compressors, the operation condition parameter of the 27 compressor.
28 [0094] The controller of the compressor may have a performance database pre-stored thereon.

1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 The performance database may include a correspondence between the operation condition 2 parameter of the compressor and the first optimal efficiency and the first workload of the 3 compressor. The first optimal efficiency and first workload calculation module may be further 4 configured to input the operation condition parameter into the performance database and output the first optimal efficiency and the first workload of the compressor.
6 [0095] The second optimal efficiency and second workload calculation module may be 7 further configured to perform, by the controller of the air conditioning unit, the cross-8 permutation and combination calculation on the first optimal efficiency and the first workload of 9 each of the plurality of compressors to obtain the second optimal efficiency and the second workload of the air conditioning unit.
11 [0096] The target optimal efficiency and target workload calculation module may be further 12 configured to determine third optimal efficiency and a third workload from the second optimal 13 efficiency and the second workload of the air conditioning unit. A
minimum of the third 14 workload is smaller than the load adjustment target value. The load adjustment target value is smaller than a maximum of the third workload. The target optimal efficiency and target workload 16 calculation module may be further configured to determine a maximum of the third optimal 17 efficiency as the target optimal efficiency and a third workload corresponding to the target 18 optimal efficiency as the target workload.
19 [0097] The maximum of the third optimal efficiency may correspond to a plurality of third workloads. The target optimal efficiency and target workload calculation module may be further 21 configured to determine a compressor operation time corresponding to the plurality of third 22 workloads corresponding to the maximum of the third optimal efficiency, and determine one of 23 the plurality of third workloads corresponding to a minimum of the compressor operation time as 24 the target workload.
[0098] The target optimal efficiency and target workload calculation module may be further 26 configured to: calculate, when there is no third workload, a difference between the minimum of 27 the second workload and the load adjustment target value; determine a second workload 28 corresponding to a minimum of the difference as the target workload; and determine second 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 optimal efficiency corresponding to the target workload as the target optimal efficiency.
2 [0099] The air conditioning unit operation module may be further configured to control the 3 actuator of the compressor based on the target optimal efficiency and the target workload, to 4 allow each of the plurality of compressors to perform the refrigeration operation or heating operation.
6 [00100] The air conditioning unit is a water chilling unit or a heat pump unit.
7 [00101] Those skilled in the art can clearly understand that, for convenience and conciseness 8 of the description, for a specific operation process of the above apparatus for the air conditioning 9 unite, reference may be made to a corresponding process in the above embodiments of the method for controlling the air conditioning unit, and details thereof will be omitted herein.
11 [00102] An electronic device according to embodiments of the present disclosure will be 12 described in detail below with reference to the accompanying drawings.
13 [00103] The embodiments of the present disclosure further provide an electronic device, 14 which is configured to run the method for controlling the air conditioning unit. Referring to a schematic structural diagram of an electronic device as illustrated in FIG. 8, the electronic device 16 may include a memory 100 and a processor 101. The memory 100 has one or more computer 17 instructions stored thereon. The one or more computer instructions are executed by the processor 18 101 to implement the above method for controlling the air conditioning unit.
19 [00104] In some embodiments of the present disclosure, the electronic device illustrated in FIG. 8 may further be configured to include a bus 102 and a communication interface 103. The 21 processor 101, the communication interface 103, and the memory 100 are connected through the 22 bus 102.
23 [00105] In addition, the memory 100 may include a high-speed Random Access Memory 24 (RAM), and may also include a non-volatile memory, such as at least one disk memory. A
communication connection between a system network element and at least one of other network 26 elements may be implemented through the at least one communication interface 103 (which may 27 be wired or wireless). Moreover, the Internet, a wide area network, a local area network, a 28 metropolitan area network, or the like may be used. The bus 102 may be an Industry Standard 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard 2 Architecture (EISA) bus. The buses may be divided into an address bus, a data bus, a control bus, 3 etc. For the convenience of description, only one bidirectional arrow is used in FIG. 8. However, 4 it does not mean that there is only one bus or one type of bus.
[00106] The processor 101 may be an integrated circuit chip with signal processing capability.
6 In an implementation, the steps of the above methods may be implemented by hardware 7 integrated logic circuits in the processor 101 or instructions in a form of software. The above 8 processor 101 may be a general-purpose processor, including a Central Processing Unit (CPU), a 9 Network Processor (NP), etc.; and may further be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or 11 other programmable logic devices, a discrete gate or a transistor logic device, and a discrete 12 hardware component. The methods, steps, and logical block diagrams disclosed in the 13 embodiments of the present disclosure may be implemented or performed by the processor 101.
14 The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present disclosure may be directly 16 embodied as being performed and completed by a hardware decoding processor, or by a 17 combination of hardware and software modules in the decoding processor.
The software module 18 may be located in a storage medium well-known in the field such as a random access memory, a 19 flash memory, a Read-Only Memory (ROM), a Programmable ROM (PROM), an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 21 100, and the processor 101 can read information from the memory 100, and completes the steps 22 in the above method in combination with hardware thereof.
23 [00107] Embodiments of the present disclosure also provide a computer-readable storage 24 medium. The computer-readable storage medium has computer-executable instructions thereon.
The computer-executable instruction, when invoked and executed by a processor, may cause the 26 processor to implement the method for controlling the air conditioning unit as described above, 27 and thus the specific implementation of the method may refer to that of the method embodiments, 28 and details thereof will be omitted herein.

1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 [00108] In the method and apparatus for controlling the air conditioning unit, and a computer 2 program product of the electronic device according to the embodiments of the present disclosure, 3 the computer program product may include a computer-readable storage medium having 4 program codes stored thereon. Instructions included in the program code can execute the method in the above method, and thus the specific implementation of the method may refer to that of the 6 method embodiments, and details thereof will be omitted herein.
7 [00109] Those skilled in the art can clearly understand that, for the convenience and 8 conciseness of the description, for the specific operation processes of the systems and/or 9 apparatus described above, reference may be made to the corresponding processes in the above method, and details thereof will be omitted here.
11 [00110] In addition, in the description of the embodiments of the present disclosure, unless 12 otherwise clearly specified and limited, terms such as "installed,"
"connected with," "connected 13 to," and the like should be understood in a broad sense. For example, it may be a fixed 14 connection or a detachable connection or connection as one piece; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate; or 16 an internal communication of two components. For those of ordinary skill in the art, the specific 17 meaning of the above-mentioned terms in the present disclosure can be understood according to 18 specific circumstances.
19 [00111] When the function is implemented in the form of a software functional unit and sold or used as a standalone product, it can be stored in a computer-readable storage medium. Based 21 on such understanding, all or part of the technical solutions according to the present disclosure, 22 or the part thereof that contributes to the related art, can be embodied in the form of a software 23 product. The computer software product may be stored in a storage medium and contain 24 instructions to enable a computer device, such as a personal computer, a server, or a network device, etc., to perform all or part of the steps of the method described in each of the 26 embodiments of the present disclosure. The storage medium may include various mediums 27 capable of storing program codes, such as a Universal Serial Bus flash drive, a mobile hard disk, 28 an ROM, an RAM, a magnetic disk, or an optical disc.

1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 [00112] In the description of the embodiments of the present disclosure, the orientation or the 2 position indicated by technical terms such as "center," "over," "below,"
"left," "right," "vertical,"
3 "horizontal," "inner," and "outer," should be construed to refer to the orientation and the position 4 as shown in the drawings, and is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the 6 pointed device or element must have a specific orientation, or be constructed and operated in a 7 specific orientation, and therefore cannot be understood as a limitation of the embodiments of the 8 present disclosure. In addition, the term "first," "second," "third" is only for descriptive purposes, 9 rather than indicating or implying relative importance.
[00113] Finally, it should be noted that the embodiments described above are merely specific 11 implementations of the present disclosure and are used only to illustrate, rather than limit the 12 technical solutions of the present disclosure, and the scope of the present disclosure is not limited 13 thereto. Although the present disclosure has been described in detail with reference to the 14 foregoing embodiments, it is conceivable for those skilled in the art that, within the technical scope disclosed in the present disclosure, modifications can be made or can be easily conceived 16 to the technical solutions described in the foregoing embodiments, or equivalent replacements 17 can be made to some of the technical features in the technical solutions described in the 18 foregoing embodiments. These modifications, changes, or replacements, which do not depart the 19 essence of corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure, shall fall within the scope of the present disclosure.
21 Therefore, the scope of the present disclosure should be defined only by claims.
22 [00114] INDUSTRIAL APPLICABILITY
23 [00115] Embodiments of the present disclosure provide a method and apparatus for 24 controlling an air conditioning unit, an electronic device, and a readable storage medium. The method includes: determining a load adjustment target value of the air conditioning unit;
26 obtaining an operation condition parameter of each of the plurality of compressors, and 27 calculating first optimal efficiency and a first workload of each of the plurality of compressors 28 based on the operation condition parameter; obtaining second optimal efficiency and a second 1403-8051-2008, v. 1 CA Application CPST Ref: 41665/00002 1 workload of the air conditioning unit by performing cross-permutation and combination 2 calculation on the first optimal efficiency and the first workload of each of the plurality of 3 compressors; determining target optimal efficiency and a target workload from the second 4 optimal efficiency and the second workload of the air conditioning unit based on the load adjustment target value; and controlling, based on the target optimal efficiency and the target 6 workload, the air conditioning unit to perform a refrigeration operation or a heating operation. In 7 this way, various compressors of different models and specifications in the air conditioning unit 8 can be adapted. Further, it is possible to enhance the energy efficiency of the air conditioning 9 unit.
[00116] In addition, it should be understood that the method and apparatus for controlling the 11 air conditioning unit, the electronic device, and the readable storage medium of the present 12 disclosure may be reproduced and may be applied to various applications.
For example, the air 13 control method and apparatus for the conditioning unit, the electronic device, and the readable 14 storage medium of the present disclosure may be applied to the technical field of air conditioners.

1403-8051-2008, v. 1

Claims

What is claimed is:

1. A method for controlling an air conditioning unit, the method being applied in the air conditioning unit comprising a plurality of compressors, the method comprising:
determining a load adjustment target value of the air conditioning unit;
obtaining an operation condition parameter of each of the plurality of compressors, and calculating first optimal efficiency and a first workload of each of the plurality of compressors based on the operation condition parameter, wherein a maximum of the first workload represents a maximum refrigerating capacity or a maximum heating capacity of the compressor at the first optimal efficiency, and wherein a minimum of the first workload represents a minimum refrigerating capacity or a minimum heating capacity of the compressor at the first optimal efficiency;
obtaining second optimal efficiency and a second workload of the air conditioning unit by performing cross-permutation and combination calculation on the first optimal efficiency and the first workload of each of the plurality of compressors, wherein a maximum of the second workload represents a maximum refrigerating capacity or a maximum heating capacity of the air conditioning unit at the second optimal efficiency, and wherein a minimum of the second workload represents a minimum refrigerating capacity or a minimum heating capacity of the air conditioning unit at the first optimal efficiency;
determining target optimal efficiency and a target workload from the second optimal efficiency and the second workload of the air conditioning unit based on the load adjustment target value; and controlling, based on the target optimal efficiency and the target workload, the air conditioning unit to perform a refrigeration operation or a heating operation.

2. The method according to claim 1, wherein the air conditioning unit comprises a controller of the air conditioning unit, the plurality of compressors, a sensor of the plurality of compressors, a controller of the plurality of compressors, and an actuator of the plurality of compressors.

3. The method according to claim 2, wherein said determining the load adjustment target value of the air conditioning unit comprises:
determining, by the controller of the air conditioning unit, the load adjustment target value of the air conditioning unit based on a target water temperature and a change curve of a current water temperature.

4. The method according to claim 2 or 3, wherein said obtaining the operation condition parameter of each of the plurality of compressors comprises:
obtaining, by the sensor of the plurality of compressors, the operation condition parameter of the compressor.

5. The method according to any one of claims 2 to 4, wherein:
the controller of the compressor has a performance database pre-stored thereon, the performance database comprising a correspondence between the operation condition parameter of the compressor and the first optimal efficiency and the first workload of the compressor; and said calculating the first optimal efficiency and the first workload of each of the plurality of compressors based on the operation condition parameter comprises:
inputting the operation condition parameter into the performance database and outputting the first optimal efficiency and the first workload of the compressor.

6. The method according to any one of claims 2 to 5, wherein said obtaining the second optimal efficiency and the second workload of the air conditioning unit by performing the cross-permutation and combination calculation on the first optimal efficiency and the first workload of each of the plurality of compressors comprises:
performing, by the controller of the air conditioning unit, the cross-permutation and combination calculation on the first optimal efficiency and the first workload of each of the plurality of compressors to obtain the second optimal efficiency and the second workload of the air conditioning unit.

7. The method according to any one of claims 1 to 6, wherein said determining the target optimal efficiency and the target workload from the second optimal efficiency and the second workload of the air conditioning unit based on the load adjustment target value comprises:
determining third optimal efficiency and a third workload from the second optimal efficiency and the second workload of the air conditioning unit, wherein a minimum of the third workload is smaller than the load adjustment target value, and wherein the load adjustment target value is smaller than a maximum of the third workload; and determining a maximum of the third optimal efficiency as the target optimal efficiency and a third workload corresponding to the target optimal efficiency as the target workload.

8. The method according to claim 7, wherein:
the maximum of the third optimal efficiency corresponds to a plurality of third workloads;
and said determining the third workload corresponding to the target optimal efficiency as the target workload comprises:
determining a compressor operation time corresponding to the plurality of third workloads corresponding to the maximum of the third optimal efficiency; and determining one of the plurality of third workloads corresponding to a minimum of the compressor operation time as the target workload.

9. The method according to claim 7, wherein said determining the target optimal efficiency and the target workload from the second optimal efficiency and the second workload of the air conditioning unit based on the load adjustment target value comprises:
calculating, when there is no third workload, a difference between the minimum of the second workload and the load adjustment target value;
determining a second workload corresponding to a minimum of the difference as the target workload; and determining second optimal efficiency corresponding to the target workload as the target optimal efficiency.

10. The method according to any one of claims 2 to 9, wherein said controlling, based on the target optimal efficiency and the target workload, the air conditioning unit to perform the refrigeration operation or the heating operation comprises:

controlling the actuator of the compressor based on the target optimal efficiency and the target workload, to allow each of the plurality of compressors to perform the refrigeration operation or the heating operation.

11. The method according to any one of claims 1 to 10, wherein the air conditioning unit is a water chilling unit or a heat pump unit.

12. An apparatus for controlling an air conditioning unit, the apparatus being applied in the air conditioning unit comprising a plurality of compressors, the apparatus comprising:
a load adjustment target value determination module configured to determine a load adjustment target value of the air conditioning unit;
a first optimal efficiency and first workload calculation module configured to obtain an operation condition parameter of each of the plurality of compressors and calculate first optimal efficiency and a first workload of each of the plurality of compressors based on the operation condition parameter, wherein a maximum of the first workload represents a maximum refrigerating capacity or a maximum heating capacity of the compressor at the first optimal efficiency, and wherein a minimum of the first workload represents a minimum refrigerating capacity or a minimum heating capacity of the compressor at the first optimal efficiency;
a second optimal efficiency and second workload calculation module configured to obtain second optimal efficiency and a second workload of the air conditioning unit by performing cross-permutation and combination calculation on the first optimal efficiency and the first workload of each of the plurality of compressors, wherein a maximum of the second workload represents a maximum refrigerating capacity or a maximum heating capacity of the air conditioning unit at the second optimal efficiency, and wherein a minimum of the second workload represents a minimum refrigerating capacity or a minimum heating capacity of the air conditioning unit at the first optimal efficiency;
a target optimal efficiency and target workload calculation module configured to determine target optimal efficiency and a target workload from the second optimal efficiency and the second workload of the air conditioning unit based on the load adjustment target value; and an air conditioning unit operation module configured to control, based on the target optimal efficiency and the target workload, the air conditioning unit to perform a refrigeration operation or a heating operation.

13. The apparatus according to claim 12, wherein the air conditioning unit comprises a controller of the air conditioning unit, the plurality of compressors, a sensor of the plurality of compressors, a controller of the plurality of compressors, and an actuator of the plurality of compressors.

14. The apparatus according to claim 13, wherein the load adjustment target value determination module is further configured to determine, by the controller of the air conditioning unit, based on a target water temperature and a change curve of a current water temperature, the load adjustment target value of the air conditioning unit.

15. The apparatus according to claim 13 or 14, wherein the first optimal efficiency and first workload calculation module is further configured to obtain, by the sensor of the plurality of compressors, the operation condition parameter of the compressor.

16. The apparatus according to any one of claims 13 to 15, wherein:
the controller of the compressor has a performance database pre-stored thereon, the performance database comprising a correspondence between the operation condition parameter of the compressor and the first optimal efficiency and the first workload of the compressor; and the first optimal efficiency and first workload calculation module is further configured to input the operation condition parameter into the performance database and output the first optimal efficiency and the first workload of the compressor.

17. The apparatus according to any one of claims 13 to 16, wherein the second optimal efficiency and second workload calculation module is further configured to perform, by the controller of the air conditioning unit, the cross-permutation and combination calculation on the first optimal efficiency and the first workload of each of the plurality of compressors to obtain the second optimal efficiency and the second workload of the air conditioning unit.

18. The apparatus according to any one of claims 13 to 17, wherein the target optimal efficiency and target workload calculation module is further configured to:
determine a third optimal efficiency and a third workload from the second optimal efficiency and the second workload of the air conditioning unit, wherein a minimum of the third workload is smaller than the load adjustment target value, and wherein the load adjustment target value is smaller than a maximum of the third workload; and determine a maximum of the third optimal efficiency as the target optimal efficiency and a third workload corresponding to the target optimal efficiency as the target workload.

19. An electronic device, comprising:
a processor; and a memory having computer-executable instructions stored thereon, the computer-executable instructions being executable by the processor, wherein the processor is configured to implement, when executing the computer-executable instructions, the method according to any one of claims 1 to 11.

20. A computer-readable storage medium, having computer-executable instructions stored thereon, wherein the computer-executable instructions, when invoked and executed by a processor, causes the processor to implement the method according to any one of claims 1 to 11.