Compressor system, control method thereof, controller, storage medium and program product

Abstract

The invention relates to a compressor system and a control method thereof, a controller, a storage medium and a program product, and relates to the technical field of refrigeration. The system comprises at least one subsystem, wherein the subsystem comprises a condenser set, a compressor set and an evaporator set; the condenser set comprises at least two condensers, the compressor set comprises at least two frequency conversion compressors, and the evaporator set comprises at least two evaporators. One end of each variable-frequency compressor is communicated with each condenser, the other end of each variable-frequency compressor is communicated with each evaporator, and each condenser is communicated with each evaporator. The utilization rate of the condenser and the evaporator can be increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a compressor system and a control method, a controller, a storage medium and a program product thereof. BACKGROUND

[0002] In a refrigeration system, a compressor can suck in low-temperature and low-pressure refrigerant gas, compress the refrigerant gas through a mechanical device, and then discharge high-temperature and high-pressure refrigerant gas to provide power for a refrigeration cycle.

[0003] In order to improve the refrigeration efficiency, the refrigeration system in the related art usually includes multiple independent subsystems, each of which includes a compressor, a condenser, an evaporator, etc. According to different refrigeration requirements, the refrigeration system can control the start and stop of the compressor in each subsystem.

[0004] However, after the compressor stops running, the condenser and the evaporator in the subsystem where the compressor is located stop running in succession, causing waste of resources of the condenser and the evaporator. SUMMARY

[0005] The present application provides a compressor system and a control method, a controller, a storage medium and a program product thereof, which can improve the utilization rate of the condenser and the evaporator. The technical solution content is as follows:

[0006] According to an aspect of the present application, a compressor system is provided, which includes:

[0007] at least one subsystem, which includes a condenser group, a compressor group and an evaporator group;

[0008] The condenser group includes at least two condensers, the compressor group includes at least two variable frequency compressors, and the evaporator group includes at least two evaporators.

[0009] One end of each variable frequency compressor is in communication with each condenser, the other end of each variable frequency compressor is in communication with each evaporator, and each condenser is in communication with each evaporator.

[0010] According to an aspect of the present application, a control method of a compressor system is provided, the compressor system includes the system as described above, the method is executed by the controller, and the method includes:

[0011] Obtaining an environmental parameter, which is obtained by the environmental sensor and sent to the controller;

[0012] Controlling at least one variable frequency compressor in the compressor system based on the environmental parameter.

[0013] According to one aspect of the present application, a controller for a compressor system is provided, the controller comprising:

[0014] An acquisition module, configured to acquire environmental parameters, wherein the environmental parameters are acquired by the environmental sensor and sent to the controller;

[0015] A control module is configured to control at least one of the variable frequency compressors in the compressor system based on the environmental parameters.

[0016] In some embodiments, the environmental sensor includes a temperature sensor, and the environmental parameter includes a temperature detection value;

[0017] The control module is configured to obtain CFC information of a cooling demand based on a difference between the temperature detection value and the temperature setting value;

[0018] The control module is configured to control at least one variable frequency compressor in the compressor system to turn on or off according to the CFC information in response to the CFC information satisfying a specified condition.

[0019] In some embodiments, the specified condition includes a compressor on condition;

[0020] The control module is configured to, in response to the CFC information satisfying the compressor start-up condition, start a first variable-frequency compressor in a first subsystem of the compressor system; the first subsystem being the subsystem in the compressor system having the least number of started variable-frequency compressors, and the first variable-frequency compressor being the variable-frequency compressor having the shortest cumulative operating time among the non-started variable-frequency compressors of the first subsystem.

[0021] In some embodiments, the specified condition includes a compressor off condition;

[0022] The control module is configured to shut down a second variable-frequency compressor in a second subsystem of the compressor system in response to the CFC information satisfying the compressor shut-down condition; the second subsystem is the subsystem in the compressor system having the largest number of activated variable-frequency compressors, and the second variable-frequency compressor is the variable-frequency compressor in the second subsystem having the longest cumulative operating time among the activated variable-frequency compressors.

[0023] In some embodiments, the environmental sensor includes a humidity sensor, and the environmental parameter includes a humidity detection value;

[0024] The control module is configured to obtain dehumidification demand information based on the difference between the humidity detection value and the humidity setting value;

[0025] The control module is configured to, in response to the dehumidification demand information satisfying a specified condition, control at least one of the variable frequency compressors in the compressor system to be turned on or turned off according to the dehumidification demand information.

[0026] According to another aspect of the present application, there is provided a computer readable storage medium having stored therein at least one computer instruction, which is loaded and executed by a processor to implement the compressor system control method according to the above aspect.

[0027] According to another aspect of the present application, there is provided a computer program product comprising computer instructions stored in a computer readable storage medium, which is read and executed by a processor to implement the compressor system control method according to the above aspect.

[0028] The technical scheme provided by the embodiments of the present application can have the following beneficial effects:

[0029] Each of the subsystems in the compressor system comprises a plurality of parallel variable frequency compressors, and each of the plurality of variable frequency compressors is connected to a plurality of condensers and a plurality of evaporators in the subsystem, that is, each of the variable frequency evaporators in the subsystem can utilize the plurality of condensers and the plurality of evaporators in the subsystem when working, and the condensers and the evaporators in the subsystem can maintain the refrigeration cycle together with the compressors in the subsystem that are running during the partial stop of the compressors in the single subsystem, thereby improving the utilization rate of the condensers and the evaporators. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0031] Figure 1 is a structural schematic diagram of a compressor system provided by an exemplary embodiment of the present application;

[0032] Figure 2 is a structural schematic diagram of a compressor system provided by an exemplary embodiment of the present application;

[0033] Figure 3 is a compressor speed regulation curve diagram provided by an exemplary embodiment of the present application;

[0034] Figure 4is a schematic diagram of a compressor loading process according to an example embodiment of the present application;

[0035] Figure 5 is a plot of compressor speed and refrigeration capacity versus time during a loading process according to an example embodiment of the present application;

[0036] Figure 6 is a schematic diagram of a compressor unloading process according to an example embodiment of the present application;

[0037] Figure 7 is a plot of compressor speed and refrigeration capacity versus time during an unloading process according to an example embodiment of the present application;

[0038] Figure 8 is a schematic diagram of a compressor loading process according to an example embodiment of the present application;

[0039] Figure 9 is a schematic diagram of a compressor unloading process according to an example embodiment of the present application;

[0040] Figure 10 is a flowchart of a method of controlling a compressor system according to an example embodiment of the present application;

[0041] Figure 11 is a block diagram of a controller of a compressor system according to an example embodiment of the present application.

[0042] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the present application. DETAILED DESCRIPTION

[0043] So that the purposes, technical solutions and advantages of the present application are more apparent, the following will make further detailed description to the embodiments of the present application in combination with the drawings.

[0044] The example embodiments will be described in detail herein with reference to the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following example embodiments are not meant to represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0045] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0046] In the embodiments of the present application, the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant laws, regulations and standards of countries and regions. For example, the attack operation and other object behaviors involved in the present application are obtained under sufficient authorization.

[0047] It should be understood that although the terms first, second, etc. can be used in this disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, a first parameter can also be referred to as a second parameter, and similarly, a second parameter can also be referred to as a first parameter, without departing from the scope of the present disclosure. Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining".

[0048] Some terms involved in the present application are introduced as follows:

[0049] 1) Refrigeration system: a system that uses a compressor to work to move heat from a low-temperature area (cooling area) to a high-temperature area (heat dissipation area). The refrigeration system includes a compressor, a condenser, an evaporator and a throttling device. The compressor, condenser, evaporator and throttling device are connected by pipes to form a closed circulation system, and the pipes contain refrigerant. Through the repeated circulation of compression, condensation, throttling and evaporation, the refrigerant continuously absorbs heat from the low-temperature area and releases heat to the high-temperature area, thereby achieving the purpose of refrigeration.

[0050] In the evaporation stage, the liquid refrigerant absorbs the heat of the environment in the cooling area in the evaporator and becomes gaseous refrigerant. The heat absorption process in the evaporation stage can lower the temperature of the environment in the cooling area, thereby achieving the refrigeration effect.

[0051] In the compression stage, the gaseous refrigerant in the evaporator is sucked into the compressor, and the compressor compresses the gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant by consuming electric energy, which is accompanied by an increase in the entropy of the refrigerant and an increase in the temperature.

[0052] In the condensation stage, the high-temperature and high-pressure gaseous refrigerant enters the condenser and exchanges heat with the heat dissipation area, releasing the heat absorbed in the evaporation stage. The high-temperature and high-pressure gaseous refrigerant is converted into high-temperature and high-pressure liquid refrigerant.

[0053] In the expansion stage, when the high-temperature and high-pressure liquid refrigerant passes through the throttling device (such as an expansion valve, a capillary tube), the pressure of the liquid refrigerant drops sharply, part of the refrigerant flashes and absorbs heat due to the pressure drop, and the temperature of the liquid refrigerant also drops, and the high-temperature and high-pressure liquid refrigerant is converted into low-temperature and low-pressure liquid refrigerant.

[0054] 2) Compressor: A driven fluid machine that raises low-pressure gas to high-pressure gas. Fixed-frequency compressor and variable-frequency compressor are two common types of compressors in refrigeration systems.

[0055] The motor operating frequency of fixed-frequency compressor is fixed, usually the same as the power frequency, and its refrigeration capacity is fixed. The compressor can only adjust the output by full-on or full-off, that is, "on-off" control, and it will stop working when the set temperature is reached, and restart when the temperature rises. Because the fixed-frequency compressor can only be turned on or off, the temperature control is not accurate, the indoor temperature will fluctuate greatly, the comfort is relatively low, and frequent start-stop will cause mechanical wear to the compressor. Under partial load, the fixed-frequency compressor is prone to problems such as excessive energy consumption and low efficiency, because it still operates at full power under low load, and the energy utilization rate is not high.

[0056] The motor operating frequency of variable-frequency compressor can be continuously adjusted according to demand, usually through a frequency converter to change the power frequency and speed of the motor, thereby changing the refrigeration capacity of the compressor. Variable-frequency compressor can realize stepless adjustment of refrigeration capacity, and when the indoor temperature approaches the set temperature, the compressor will not stop completely, but will reduce the speed to maintain a constant temperature. By continuously adjusting the refrigeration capacity, the variable-frequency compressor can achieve more accurate temperature control, the indoor temperature changes smoothly, and the comfort is higher. At the same time, the stepless speed regulation of the variable-frequency compressor reduces the frequent start-stop, reduces mechanical wear, and prolongs the service life of the compressor. Under partial load, the variable-frequency compressor can reduce the speed and power output, thereby reducing energy consumption and improving operating efficiency. Especially under partial load conditions, the coefficient of performance (COP) of the variable-frequency compressor is significantly higher than that of the fixed-frequency compressor.

[0057] Please refer to Figure 1 , which shows a structural schematic diagram of a compressor system provided by an example embodiment of the present application. As Figure 1 shown, the compressor system includes at least one subsystem 110, the subsystem 110 including a condenser group 101, a compressor group 102, and an evaporator group 103; the condenser group 101 including at least two condensers, the compressor group 102 including at least two variable-frequency compressors, and the evaporator group 103 including at least two evaporators; one end of each variable-frequency compressor is in communication with each condenser, the other end of each variable-frequency compressor is in communication with each evaporator, and each condenser is in communication with each evaporator.

[0058] In the embodiment of the present application, the condenser, the compressor and the evaporator in each subsystem 110 are connected by pipes to form a closed circulation system, and the pipes circulate refrigerant.

[0059] In the embodiment of the present application, the condenser, the compressor and the evaporator in each subsystem 110 are connected by pipes to form a closed circulation system, and the pipes circulate refrigerant.

[0060] For example, the compressor system further comprises a throttling device, and the throttling device is arranged between the evaporator and the condenser and close to the pipe of the evaporator. For example, the throttling device can be an electronic expansion valve.

[0061] In the embodiment of the present application, the condenser, the compressor and the evaporator in each subsystem 110 are connected by pipes to form a closed circulation system, and the pipes circulate refrigerant.

[0062] For example, the compressor system further comprises a throttling device, and the throttling device is arranged between the evaporator and the condenser and close to the pipe of the evaporator. For example, the throttling device can be an electronic expansion valve.

[0063] In the embodiment of the present application, the condenser, the compressor and the evaporator in each subsystem 110 are connected by pipes to form a closed circulation system, and the pipes circulate refrigerant.

[0064] Based on the above Figure 1 In a possible implementation of the scheme shown in the embodiment of the present application, the above Figure 1The compressor system also includes a controller 120; the controller 120 is electrically connected with each variable frequency compressor in at least one subsystem; the controller 120 is used to control the working state of the variable frequency compressor.

[0065] In the embodiments of the present application, the above-mentioned controller 120 is electrically connected with each variable frequency compressor in each subsystem 110, which means that the controller 120 can send control instructions to each variable frequency compressor; for example, the controller 120 can control the opening and closing of each variable frequency compressor; for another example, the controller 120 can adjust the rotating speed of the opened variable frequency compressor.

[0066] Optionally, each variable frequency compressor can also send data information to the controller 120; for example, each variable frequency compressor can send its working state (including the opening state and the closing state), rotating speed and other information to the controller 120.

[0067] That is to say, the controller 120 can control each variable frequency compressor in each subsystem 110 to perform opening, closing, rotating speed adjustment and other operations according to the actual application requirements and the working state and rotating speed of each variable frequency compressor, so as to meet the specified refrigeration requirements in the actual application; since the controller 120 is electrically connected with multiple variable frequency compressors at the same time, the controller 120 can flexibly control the working state and rotating speed of multiple variable frequency compressors, thereby improving the working efficiency of the compressor; for example, the controller 120 can flexibly increase / decrease the working variable frequency compressors and increase / decrease the rotating speed of the variable frequency compressor according to the refrigeration requirements, so as to reduce the number of variable frequency compressors working at the same time as much as possible and balance the working time of each variable frequency compressor while meeting the refrigeration requirements.

[0068] Based on the above-mentioned schemes in each embodiment of the present application, in one possible implementation, the above-mentioned Figure 1 The compressor system includes at least two subsystems 110, and the evaporators of the at least two subsystems 110 correspond to the same air supply outlet.

[0069] In the embodiments of the present application, the evaporators of the at least two subsystems 110 correspond to the same air supply outlet, which means that the evaporator groups of each subsystem 110 correspond to the same air supply fan, so that each subsystem 110 can use the same air supply fan to provide refrigeration circulation for the same environment or area, without the need to set an air supply fan for the evaporator of each subsystem, thereby improving the use efficiency of the air supply fan; for example, when the variable frequency compressors in part of the multiple subsystems are all closed, the remaining part of the subsystems can also use the above-mentioned air supply fan to provide refrigeration circulation for the environment or area.

[0070] For example, the above-mentioned Figure 1The compressor system shown includes two subsystems 110, for example, refer to Figure 2 Fig. 1 shows a structural schematic diagram of a compressor system provided by an example embodiment of the present application.

[0071] As shown in Figure 2 The compressor system is a full variable frequency compressor parallel dual refrigeration system, including two subsystems, each of which includes an exhaust fan 1, a condenser group 2, a compressor group 3, an evaporator group 4, and an electronic expansion valve 5; the condenser group 2 includes two condensers connected in parallel by pipes, and the compressor group 3 includes two variable frequency compressors connected in parallel by pipes; wherein one compressor group 3 includes variable frequency compressor 31 and variable frequency compressor 32, and the other compressor group 3 includes variable frequency compressor 33 and variable frequency compressor 34, and the evaporator group 4 includes two evaporators connected in parallel by pipes.

[0072] Among them, the above Figure 2 The compressor system shown also includes a supply fan 6, and the four evaporators in the two subsystems correspond to the air supply port of the supply fan 6.

[0073] The above Figure 2 The condenser, compressor, evaporator and electronic expansion valve in the single subsystem shown are connected by pipes to form a closed circulation system, and the pipes circulate refrigerant. For example, the outlets of the two evaporators are connected by pipes to the inlets of the two compressors, respectively, the outlets of the two variable frequency compressors are connected by pipes to the inlets of the two condensers, respectively, and the outlets of the two condensers are connected by pipes to the inlets of the two evaporators, respectively; there are two electronic expansion valves, which are respectively arranged between the evaporator and the condenser, close to the pipe of the evaporator.

[0074] On the one hand, in the above Figure 2 For example, in the subsystem where the variable frequency compressor 31 and the variable frequency compressor 32 are located, when the controller starts the variable frequency compressor 31 and the variable frequency compressor 32 and works for a period of time, the controller only closes one of the variable frequency compressors (such as the variable frequency compressor 31), and the other variable frequency compressor (such as the variable frequency compressor 32) can use all the compressors, condensers and other devices in the subsystem to improve the utilization rate of the compressors and condensers.

[0075] Conversely, if at least two variable frequency compressors in the same subsystem are connected to the corresponding compressors and condensers of themselves, but not to the corresponding compressors and condensers of other variable frequency compressors, when one variable frequency compressor is closed, the evaporator and condenser corresponding to the variable frequency compressor will also stop working, that is, for the closed variable frequency compressor, the corresponding evaporator and condenser will not be effectively utilized, resulting in low utilization rate of the evaporators and condensers in the system.

[0076] On the other hand, in the compressor system shown in the above Figure 2 In the compressor system shown in the above

[0077] On the contrary, if the two evaporator groups in the two subsystems correspond to different air supply outlets (i.e., different air supply fans), when the two variable frequency compressors in one of the subsystems are turned off, only the other subsystem provides the refrigeration cycle, the air supply outlet / fan corresponding to the turned-off subsystem cannot be utilized, resulting in a low utilization rate of the air supply outlets / fans of the entire compressor system.

[0078] In addition, in the compressor system shown in the above Figure 2 The controller (not shown in the above Figure 2 That is, the working states of the four variable frequency compressors in the two subsystems can be controlled by the same controller. For example, the controller can control the four variable frequency compressors to perform operations such as turning on, turning off, and adjusting the speed in real time according to the refrigeration demand of the compressor system, so as to realize flexible scheduling of the four variable frequency compressors under the premise of meeting the refrigeration demand. For example, the controller can set different compressor speeds according to the number of variable frequency compressors that have been turned on, so as to avoid the instability of the refrigeration effect caused by the rapid frequency rise and fall of the compressor during the process of loading and unloading.

[0079] Based on the schemes shown in the above embodiments of the present application, in one possible implementation, the compressor system shown in the above Figure 1 The compressor system shown in the above

[0080] The temperature sensor is used to detect the ambient temperature and convert the ambient temperature information into an electrical signal. The temperature sensor outputs an electrical signal, and the controller receives the electrical signal accordingly. The temperature sensor can be a thermistor, a thermocouple, a resistance temperature detector, or the like.

[0081] The humidity sensor is used to measure the relative humidity or absolute humidity in the environment and convert the environmental humidity information into an electrical signal. The humidity sensor outputs an electrical signal; accordingly, the controller receives the electrical signal. The humidity sensor can be a capacitive humidity sensor, a resistive humidity sensor, a dew point humidity sensor, etc.

[0082] In the embodiments of the present application, the environmental parameters obtained by the environmental sensor can include at least one of a temperature detection value and a humidity detection value. The environmental sensor is electrically connected to the controller, which means that the environmental sensor can send the collected environmental parameters to the controller; for example, the environmental sensor can send the obtained environmental parameters (including environmental temperature, environmental humidity, etc.) to the controller; so that the controller can obtain the temperature and humidity information in the environment according to the environmental parameters, and then the controller can obtain the cooling, dehumidifying, etc. requirements of the current environment according to the temperature and humidity information, and then the controller can flexibly control each variable frequency compressor in the compressor system, and balance the running time and running speed of each variable frequency compressor in the compressor system under the condition of meeting the cooling, dehumidifying, etc. requirements of the current environment.

[0083] Optionally, the controller can also send a control instruction to the environmental sensor, for example, the control instruction can indicate which environmental sensor to obtain the environmental parameters.

[0084] For example, the controller can select a corresponding environmental sensor to obtain a corresponding environmental parameter according to the temperature and humidity control mode in the actual application. The temperature and humidity control mode includes a return air temperature control mode, a supply air temperature control mode, or a humidity control mode, etc.

[0085] In the case where the temperature and humidity control mode is the return air temperature control mode, the environmental sensor is a temperature sensor, which can be arranged in the return air duct of the compressor system, so as to facilitate the controller to monitor the return air temperature (such as the air returned from the indoor to the compressor system) in real time and compare it with the set temperature; the controller can adjust the output of at least one variable frequency compressor according to the deviation between the return air temperature and the set temperature, so as to maintain the indoor temperature within the set range.

[0086] In the case where the temperature and humidity control mode is the supply air temperature control mode, the environmental sensor is a temperature sensor, which can be arranged in the supply air duct of the compressor system, so as to facilitate the controller to monitor the air temperature (i.e. the supply air temperature) to be sent into the indoor in real time; the controller can maintain the indoor temperature within the set range by adjusting the output of at least one variable frequency compressor.

[0087] In the case that the temperature and humidity control mode is the humidity control mode, the environment sensor is a humidity sensor, which can be arranged indoors to facilitate the controller to monitor the air humidity in the room in real time; the controller maintains the indoor humidity in the set range by adjusting the rotating speed of the at least one variable frequency compressor and the superheat of the evaporator.

[0088] Based on the above-mentioned schemes of the various embodiments of the present application, in one possible implementation, the environment sensor includes a temperature sensor, and the environment parameter includes a temperature detection value; the controller is configured to:

[0089] obtain the cooling demand (CFC) information through the difference between the temperature detection value and the temperature set value;

[0090] in response to the CFC information satisfying a specified condition, control at least one variable frequency compressor in the compressor system to be turned on or turned off according to the CFC information.

[0091] In the case that the environment sensor includes the temperature sensor, the temperature detection value obtained by the temperature sensor can include at least one of a supply air temperature detection value and a return air temperature detection value. The temperature set value can be a temperature reference value set in the controller by the control personnel in advance; accordingly, the temperature set value can include at least one of a supply air temperature set value and a return air temperature set value corresponding to the temperature detection value. For example, when the temperature detection value includes the supply air temperature detection value, the temperature set value can include the supply air temperature set value; when the temperature detection value includes the return air temperature detection value, the temperature set value can include the return air temperature set value.

[0092] In the embodiments of the present application, when the temperature detection value is the supply air temperature detection value, the controller can obtain the difference between the supply air temperature detection value and the supply air temperature set value; then, the controller can obtain the cooling demand (CFC) information according to the difference.

[0093] The CFC information can be used to schedule and manage the operation of the compressor system; the specified condition can be one or more reference values of the CFC information set in the controller by the control personnel in advance.

[0094] The above-mentioned control of at least one variable frequency compressor in the compressor system to be turned on or turned off according to the CFC information means that the controller can control the loading and unloading of the variable frequency compressor according to the CFC information.

[0095] The embodiment of the present application shows how the controller controls the feasibility scheme of at least one variable frequency compressor in the compressor system according to the temperature detection value, which can specifically include that the controller obtains the difference between the temperature detection value and the temperature set value, and obtains the refrigeration demand CFC information according to the difference, and then the controller can control the working state of the variable frequency compressor according to whether the refrigeration demand CFC information meets the specified condition set in advance. The scheme can directly reflect the current refrigeration demand of the environment according to the temperature detection value to obtain the refrigeration demand CFC information, and facilitate the flexible control of the working state of each variable frequency compressor to meet the current refrigeration demand of the environment.

[0096] In a possible implementation, the controller is configured to:

[0097] obtain a temperature detection value at a first sampling time and a temperature detection value at a second sampling time; the first sampling time is a current sampling time, and the second sampling time is earlier than the first sampling time;

[0098] obtain the CFC information by the difference between the temperature detection value at the first sampling time and the temperature set value, and the difference between the temperature detection value at the second sampling time and the temperature set value.

[0099] That is, the embodiment of the present application shows how to obtain the refrigeration demand CFC information. For example, in a CFC information calculation period, k sampling times can be included, and k is a positive integer greater than 2. The scheme can not only obtain the temperature information at the current time, but also obtain the temperature information before the current time according to the temperature detection values at two different times in a period of time, so as to facilitate the controller to obtain the temperature change in the environment and better realize the scheduling control of each variable frequency compressor.

[0100] For example, when the controller obtains the CFC information at the kth sampling time, the controller can obtain the temperature detection value at the kth sampling time and the temperature detection value at the k-1th sampling time; then, the difference between the temperature detection value at the kth sampling time and the temperature set value, and the difference between the temperature detection value at the k-1th sampling time and the temperature set value are obtained; then, the CFC information at the kth sampling time is calculated according to the following formula:

[0101]

[0102] CFC(k) represents the refrigeration demand at the kth sampling time, and the calculated value of CFC(k) ranges from 0 to 100%; PID(k) represents the PID calculated value at the kth sampling time; e(k) represents the difference between the supply air temperature / return air temperature detection value and the temperature set value at the kth sampling time; e(k-1) represents the difference between the supply air temperature / return air temperature detection value and the temperature set value at the (k-1)th sampling time; Kp represents the refrigeration demand proportional coefficient; T i represents the refrigeration demand integral coefficient; T d represents the refrigeration demand differential coefficient; T represents the refrigeration demand calculation period, with the unit of s.

[0103] For example, the calculation of the refrigeration demand CFC information also includes dead zone processing, such as the temperature control dead zone range of 0-10℃, with the accuracy of 0.1:

[0104] When e(k)>+temperature control dead zone, e(k)=(detection value-set value)-temperature control dead zone;

[0105] When e(k)<-temperature control dead zone, e(k)=(detection value-set value)+temperature control dead zone;

[0106] When-temperature control dead zone≤e(k)≤+temperature control dead zone, PID(k)=PID(k-1).

[0107] For example, taking the compressor system shown in the above Figure 2 as an example, please refer to Figure 3 , which shows the compressor speed regulation curve provided by an example embodiment of the present application. As shown in Figure 3 , the compressor system corresponds to different speed regulation mapping curves when the number of running compressors is 1, 2, 3, and 4, respectively. Among them, point A1 represents the lower limit of the demand of 1 compressor, point A2 represents the upper limit of the demand of 1 compressor, and line segment A1, A2 represents the speed of 1 compressor; point B1 represents the lower limit of the demand of 2 compressors, point B2 represents the upper limit of the demand of 2 compressors, and line segment B1, B2 represents the speed of 2 compressors; point C1 represents the lower limit of the demand of 3 compressors, point C2 represents the upper limit of the demand of 3 compressors, and line segment C1, C2 represents the speed of 3 compressors; point D1 represents the lower limit of the demand of 4 compressors, point D2 represents the upper limit of the demand of 4 compressors, and line segment D1, D2 represents the speed of 4 compressors.

[0108] Among them, the specific control strategy of the compressor speed is as follows:

[0109] When the number of running compressors is n, according to the n compressor speed regulation curve, the compressor mapping speed u(k) is calculated as follows:

[0110] u(k) = A*CFC(k) + B

[0111] wherein u(k) represents compressor mapping speed; CFC(k) represents the above-mentioned CFC information; A represents a first coefficient, A = (compressor rated speed - compressor minimum speed) / (n compressor mapping demand upper limit - n compressor mapping demand lower limit); B represents a constant, B = compressor minimum speed - n compressor mapping demand lower limit * A.

[0112] In a possible implementation, the specified condition comprises a compressor starting condition, and the controller is configured to start a first variable frequency compressor in a first subsystem of the compressor system in response to the CFC information satisfying the compressor starting condition; the first subsystem is a subsystem in the compressor system in which the number of started variable frequency compressors is the least, and the first variable frequency compressor is a variable frequency compressor with the least cumulative running time among the non-started variable frequency compressors in the first subsystem.

[0113] The above-mentioned compressor starting condition can be a condition indicating that the current refrigerating capacity of the compressor system is small (or the refrigerating demand is high), and the number of running variable frequency compressors needs to be increased.

[0114] For example, in order to reduce the starting current and mechanical impact of the variable frequency compressor, the controller can control the variable frequency compressor to perform soft starting, that is, to control the starting mode of the compressor motor through the frequency converter, so as to realize a more smooth and gradual starting process. For example, the controller can control the variable frequency compressor to start at an asynchronous speed for 3 s, and then adjust to an oil return speed and maintain for 90 s. The time of soft starting is included in the cumulative running time.

[0115] In the embodiments of the present application, when the above-mentioned CFC information satisfies the compressor starting condition, the controller obtains the number of started variable frequency compressors in each subsystem and the cumulative running time of each variable frequency compressor; then, the variable frequency compressor with the least cumulative running time in the subsystem with the least number of started variable frequency compressors (i.e., the above-mentioned first variable frequency compressor) is started preferentially. Since the evaporators of each subsystem correspond to the same air outlet, when any variable frequency compressor is started, it can maintain the cycle of providing refrigeration to the corresponding environment or area. When the above-mentioned CFC information satisfies the compressor starting condition, the controller can start the idle variable frequency compressor in the idle subsystem preferentially. This scheme can prevent one or more variable frequency compressors from running for too long, ensure the performance of the variable frequency compressor, prolong the service life of the variable frequency compressor, and thus improve the refrigeration efficiency of the compressor system.

[0116] For example, taking the compressor system shown in the above-mentioned Figure 2 The loading process of the compressor system is as follows:

[0117] Start 1 compressor: When the CFC obtained by the controller meets the first compressor start condition (for example, CFC > 10%), the compressor system enters the refrigeration mode, and the controller starts the variable-frequency compressor with the shortest cumulative running time among the four variable-frequency compressors (for example, variable-frequency compressor 31);

[0118] Start 2 compressors: When the CFC obtained by the controller meets the second compressor start condition (for example, CFC > 30%), the controller starts the compressor with the shorter cumulative running time in another subsystem (for example, variable-frequency compressor 33);

[0119] Start 3 compressors: When the CFC obtained by the controller meets the third compressor start condition (for example, CFC > 50%), the controller starts the one with the shorter cumulative running time among the remaining two compressors (for example, variable-frequency compressor 32);

[0120] Start 4 compressors: When the CFC obtained by the controller meets the fourth compressor start condition (for example, CFC > 70%), the controller starts the last compressor (for example, variable-frequency compressor 34).

[0121] Please refer to Figure 4 , which shows a schematic diagram of the compressor loading process provided by an exemplary embodiment of the present application. As Figure 4 shown, when the CFC obtained by the controller is 10%, start variable-frequency compressor 31; when 10% < CFC < 23%, variable-frequency compressor 31 performs a soft start; when 23% < CFC < 40%, variable-frequency compressor 31 operates according to the Figure 3 mapping curve of the speed of 1 compressor in the above Figure 3 (i.e., the line segment A1A2 in

[0122] When CFC is 30%, start variable-frequency compressor 33; when 30% < CFC < 43%, variable-frequency compressor 33 performs a soft start; when 40% < CFC < 43%, variable-frequency compressor 31 reduces its frequency to the target mapped speed; when 43% < CFC < 60%, variable-frequency compressor 31 and variable-frequency compressor 33 operate according to the Figure 3 mapping curve of the speeds of 2 compressors in the above Figure 3 (i.e., the line segment B1B2 in

[0123] When CFC is 50%, start variable-frequency compressor 32; when 50% < CFC < 63%, variable-frequency compressor 32 performs a soft start; when 60% < CFC < 63%, variable-frequency compressor 31 and variable-frequency compressor 33 reduce their frequencies to the target mapped speeds; when 63% < CFC < 80%, variable-frequency compressor 31, variable-frequency compressor 33, and variable-frequency compressor 32 operate according to the Figure 3 mapping curve of the speeds of 3 compressors in the aboveFigure 3 It runs along the line segment C1C2) in []. Taking the loading process of starting the third compressor (i.e., the variable-frequency compressor 32) as an example, the curve graph of the compressor speed and refrigerating capacity changing with time during the loading process is as Figure 5 shown.

[0124] When the CFC is 70%, the variable-frequency compressor 34 is started; when 70% < CFC < 83%, the variable-frequency compressor 34 performs a soft start; when 80% < CFC < 83%, the variable-frequency compressors 31, 32, and 33 are frequency-reduced to the target mapped speed; when 83% < CFC < 100%, the variable-frequency compressors 31, 32, 33, and 34 operate according to the mapping curve of the speeds of the 4 compressors in the above Figure 3 (i.e., the line segment D1D2) in []. Figure 3

[0125] In a possible implementation, the specified condition includes a compressor shutdown condition. The controller is used to respond to the CFC information satisfying the compressor shutdown condition and shut down the second variable-frequency compressor in the second subsystem of the compressor system; the second subsystem is the subsystem in the compressor system with the largest number of started variable-frequency compressors, and the second variable-frequency compressor is the variable-frequency compressor with the longest cumulative operation time among the started variable-frequency compressors in the second subsystem.

[0126] Among them, the above compressor shutdown condition can be a condition indicating that the current refrigerating capacity of the compressor system is relatively large (or the refrigeration demand is relatively low) and the number of running variable-frequency compressors needs to be shut down.

[0127] In the embodiment of the present application, when the above CFC information satisfies the compressor shutdown condition, the controller obtains the number of started variable-frequency compressors in each subsystem and the cumulative operation time of each variable-frequency compressor; then, it preferentially starts the variable-frequency compressor with the longest cumulative operation time (i.e., the above second variable-frequency compressor) in the subsystem with the largest number of started variable-frequency compressors. This solution can preferentially shut down the variable-frequency compressor with the longest operation time, balance the operation time of each variable-frequency compressor, prevent one or more variable-frequency compressors from running for too long, ensure the performance of the variable-frequency compressor, extend the service life of the variable-frequency compressor, and thus improve the refrigeration efficiency of the compressor system.

[0128] Exemplarily, taking the compressor system shown in the above Figure 2 as an example, the unloading process of this compressor system is as follows:

[0129] Shut down 1 compressor: When the CFC obtained by the controller satisfies the first compressor shutdown condition (such as CFC < 60%), the controller shuts down the variable-frequency compressor with the longest cumulative operation time among the four variable-frequency compressors (such as the variable-frequency compressor 31);

[0130] Turning off 2 compressors: when the CFC obtained by the controller satisfies the second compressor turning-off condition (such as CFC < 40%), the controller turns off the compressor (such as the variable frequency compressor 33) in the other subsystem which has a longer cumulative running time;

[0131] Turning off 3 compressors: when the CFC obtained by the controller satisfies the third compressor turning-off condition (such as CFC < 20%), the controller turns off the compressor (such as the variable frequency compressor 32) in the remaining two compressors which has a longer cumulative running time;

[0132] Turning off 4 compressors: when the compressor system exits the refrigeration mode, the controller turns off the last compressor (such as the variable frequency compressor 34).

[0133] Please refer to Figure 6 , which shows a schematic diagram of the compressor load shedding process provided by an exemplary embodiment of the present application. As shown in Figure 6 , when 60% < CFC < 100%, the variable frequency compressors 31, 32, 33 and 34 operate according to the mapping curve of the rotational speed of the four compressors in Figure 3 (i.e. the line segment D1D2 in Figure 3 ); when 57% < CFC < 60%, the variable frequency compressor 31 performs the turning-off logic, and the variable frequency compressors 32, 33 and 34 are frequency-boosted to the target mapping rotational speed.

[0134] When 40% < CFC < 57%, the variable frequency compressors 32, 33 and 34 operate according to the mapping curve of the rotational speed of the three compressors in Figure 3 (i.e. the line segment C1C2 in Figure 3 ); when 37% < CFC < 40%, the variable frequency compressor 33 performs the turning-off logic, and the variable frequency compressors 32 and 34 are frequency-boosted to the target mapping rotational speed. Taking the load shedding process of turning off the second compressor (i.e. the variable frequency compressor 33) as an example, the curve diagram of the compressor rotational speed and the refrigeration capacity changing over time in the load shedding process is shown in Figure 7 .

[0135] When 20% < CFC < 37%, the variable frequency compressors 32 and 34 operate according to the mapping curve of the rotational speed of the two compressors in Figure 3 (i.e. the line segment B1B2 in Figure 3 ); when 17% < CFC < 20%, the variable frequency compressor 32 performs the turning-off logic, and the variable frequency compressor 34 is frequency-boosted to the target mapping rotational speed.

[0136] When CFC < 17%, the variable frequency compressor 34 performs the turning-off logic.

[0137] Based on the scheme shown in the above various embodiments of the present application, in a possible implementation, the environment sensor includes a humidity sensor, and the environment parameter includes a humidity detection value; the controller is configured to:

[0138] obtain the dehumidification demand information through a difference between the humidity detection value and a humidity set value;

[0139] in response to the dehumidification demand information satisfying a specified condition, control at least one variable frequency compressor in the compressor system to be turned on or turned off according to the dehumidification demand information.

[0140] The dehumidification demand information is used to indicate the intensity of the dehumidification demand, and the specified condition can be one or more reference values of the dehumidification demand information pre-set in the controller by a control personnel. For example, when the dehumidification demand information satisfies one reference value, the controller turns on one or more variable frequency compressors in the compressor system; for another example, when the dehumidification demand information satisfies another reference value, the controller turns off one or more variable frequency compressors in the compressor system.

[0141] For example, the controller can also be electrically connected to each evaporator in each subsystem. Accordingly, the controller can also control the supercooling degree of the evaporator (for example, reduce the surface temperature of the evaporator) to enhance the dehumidification effect of the compressor system.

[0142] The embodiments of the present application show a feasible scheme of how the controller controls at least one variable frequency compressor in the compressor system according to the humidity detection value, which can specifically include that the controller obtains a difference between the humidity detection value and a humidity set value, and obtains dehumidification demand information according to the difference, and then the controller can control the working state of the variable frequency compressor according to whether the dehumidification demand information satisfies a specified condition pre-set. The present scheme can directly reflect the humidity demand of the current environment according to the humidity detection value to obtain the dehumidification demand information, and facilitate flexible control of the working state of each variable frequency compressor to meet the humidity demand of the current environment.

[0143] In a possible implementation, the controller is configured to:

[0144] obtain a humidity detection value at a third sampling time and a humidity detection value at a fourth sampling time; the third sampling time is a current sampling time, and the fourth sampling time is earlier than the third sampling time;

[0145] obtain the dehumidification demand information through a difference between the humidity detection value at the third sampling time and a humidity set value, and a difference between the humidity detection value at the fourth sampling time and the humidity set value.

[0146] For example, a calculation cycle for dehumidification demand information may include k sampling moments, where k is a positive integer greater than 2. When the controller obtains the dehumidification demand information at the kth sampling moment, the controller may obtain the humidity detection value at the kth sampling moment and the humidity detection value at the k-1th sampling moment; then, obtain the difference between the humidity detection value at the kth sampling moment and the humidity setting value, and the difference between the humidity detection value at the k-1th sampling moment and the humidity setting value; then, calculate the dehumidification demand information at the kth sampling moment according to a specified formula.

[0147] In other words, the embodiment of the present application illustrates a feasible solution for obtaining dehumidification demand information. Based on humidity detection values ​​at two different times within a period of time, this solution can not only obtain dehumidification demand information at the current time, but also obtain dehumidification demand information prior to the current time. This facilitates the controller to detect humidity changes in the environment and better implement the scheduling control of each variable-frequency compressor.

[0148] In one possible implementation, the specified conditions include compressor start-up conditions, and the controller is used to start the first variable-frequency compressor in the first subsystem of the compressor system in response to the dehumidification demand information satisfying the compressor start-up conditions; the first subsystem is the subsystem in the compressor system with the least number of turned-on variable-frequency compressors, and the first variable-frequency compressor is the variable-frequency compressor with the shortest cumulative running time among the non-turned-on variable-frequency compressors of the first subsystem.

[0149] The above compressor start-up condition may indicate that the current dehumidification effect of the compressor system is poor (or the dehumidification demand is high), and the number of running variable frequency compressors needs to be increased.

[0150] In an embodiment of the present application, when the above-mentioned dehumidification demand information meets the compressor start-up conditions, the controller obtains the number of variable-frequency compressors that are turned on in each subsystem, as well as the cumulative running time of each variable-frequency compressor; then, the variable-frequency compressor with the shortest cumulative running time (i.e., the above-mentioned first variable-frequency compressor) is preferentially turned on in the subsystem with the least number of turned-on variable-frequency compressors.

[0151] In other words, the controller can give priority to turning on the idle variable-frequency compressors in the idle subsystem. This solution can prevent one or more variable-frequency compressors from running for too long, ensure the performance of the variable-frequency compressors, extend the service life of the variable-frequency compressors, and thus improve the cooling efficiency of the compressor system.

[0152] For example, the above Figure 2 Taking the compressor system shown in the figure as an example, the loading process of the compressor system is as follows:

[0153] Turning on 1 compressor: when the dehumidification demand information obtained by the controller meets the first compressor turning-on condition, the compressor system enters the dehumidification mode, and the controller turns on the variable frequency compressor (for example, variable frequency compressor 31) with the shortest cumulative running time among the four variable frequency compressors;

[0154] Turning on 2 compressors: when the dehumidification demand information obtained by the controller meets the second compressor turning-on condition, the controller turns on the variable frequency compressor (for example, variable frequency compressor 33) with the shorter cumulative running time in the other subsystem;

[0155] Turning on 3 compressors: when the dehumidification demand information obtained by the controller meets the third compressor turning-on condition, the controller turns on the variable frequency compressor (for example, variable frequency compressor 32) with the shorter cumulative running time among the remaining two compressors;

[0156] Turning on 4 compressors: when the dehumidification demand information obtained by the controller meets the fourth compressor turning-on condition, the controller turns on the last variable frequency compressor (for example, variable frequency compressor 34).

[0157] Please refer to Figure 8 , which shows a schematic diagram of the compressor loading process provided by an exemplary embodiment of the present application. As shown in Figure 8 , when the dehumidification demand information obtained by the controller is 90%, the variable frequency compressor 31 is turned on; when 85% < dehumidification demand information < 90%, the variable frequency compressor 31 performs soft start; when 60% < dehumidification demand information < 85%, the variable frequency compressor 31 operates according to the mapping curve of the rotational speed of 1 compressor in Figure 3 , that is, the line segment A1A2 in Figure 3 .

[0158] When the dehumidification demand information is 70%, the variable frequency compressor 33 is turned on; when 57% < dehumidification demand information < 70%, the variable frequency compressor 33 performs soft start; when 55% < dehumidification demand information < 60%, the variable frequency compressor 31 is reduced to the target mapping rotational speed; when 40% < dehumidification demand information < 55%, the variable frequency compressors 31 and 33 operate according to the mapping curve of the rotational speed of 2 compressors in Figure 3 , that is, the line segment B1B2 in Figure 3 .

[0159] When the dehumidification demand information is 50%, the variable frequency compressor 32 is turned on; when 37% < dehumidification demand information < 50%, the variable frequency compressor 32 performs soft start; when 35% < dehumidification demand information < 40%, the variable frequency compressor 33 is reduced to the target mapping rotational speed; when 20% < dehumidification demand information < 35%, the variable frequency compressors 31, 33, and 32 operate according to the mapping curve of the rotational speed of 3 compressors in Figure 3 , that is, the line segment C1C2 in Figure 3The line segment C1C2) in the diagram runs.

[0160] When the dehumidification demand information is 30%, the variable frequency compressor 34 is turned on; when 17% < dehumidification demand information < 30%, the variable frequency compressor 34 performs soft start; when 15% < dehumidification demand information < 20%, the variable frequency compressor 32 is reduced to the target mapping speed; when 0 < dehumidification demand information < 15%, the variable frequency compressor 31, the variable frequency compressor 32, the variable frequency compressor 33 and the variable frequency compressor 34 are turned on according to the above Figure 3 The mapping curve of the speed of the four compressors in Figure 3 The line segment D1D2) in runs.

[0161] In one possible implementation, the specified conditions include a compressor shutdown condition, and the controller is used to shut down the second variable-frequency compressor in the second subsystem of the compressor system in response to the dehumidification demand information satisfying the compressor shutdown condition; the second subsystem is the subsystem in the compressor system with the largest number of turned-on variable-frequency compressors, and the second variable-frequency compressor is the variable-frequency compressor with the longest cumulative running time among the turned-on variable-frequency compressors of the second subsystem.

[0162] The above-mentioned compressor shut-off condition may indicate that the current dehumidification effect of the compressor system is excessive (or the dehumidification demand is low), and the number of running variable frequency compressors needs to be shut down.

[0163] In an embodiment of the present application, when the dehumidification demand information satisfies the compressor shutdown condition, the controller obtains the number of activated variable-frequency compressors in each subsystem and the cumulative operating time of each variable-frequency compressor; thereafter, the variable-frequency compressor with the longest cumulative operating time (i.e., the second variable-frequency compressor) in the subsystem with the largest number of activated variable-frequency compressors is preferentially activated. This solution can preferentially shut down the variable-frequency compressor with the longest operating time, balance the operating time of each variable-frequency compressor, prevent one or more variable-frequency compressors from running for too long, ensure the performance of the variable-frequency compressor, extend the service life of the variable-frequency compressor, and thereby improve the refrigeration efficiency of the compressor system.

[0164] For example, the above Figure 2 Taking the compressor system shown in the figure as an example, the load reduction process of the compressor system is as follows:

[0165] Turn off one compressor: When the dehumidification demand information obtained by the controller meets the first compressor shutdown condition, the controller turns off the variable frequency compressor with the longest cumulative running time among the four variable frequency compressors (such as variable frequency compressor 31);

[0166] Turning off 2 compressors: when the dehumidification demand information obtained by the controller satisfies the second compressor turning-off condition, the controller turns off the compressor (such as the variable frequency compressor 33) in the other subsystem which has a longer cumulative running time;

[0167] Turning off 3 compressors: when the dehumidification demand information obtained by the controller satisfies the third compressor turning-off condition, the controller turns off the compressor (such as the variable frequency compressor 32) in the remaining two compressors which has a longer cumulative running time;

[0168] Turning off 4 compressors: when the compressor system exits the refrigeration mode, the controller turns off the last compressor (such as the variable frequency compressor 34).

[0169] Please refer to Figure 9 , which shows a schematic diagram of the compressor load shedding process provided by an exemplary embodiment of the present application. As shown in Figure 9 , when 0 < dehumidification demand information < 40%, the variable frequency compressors 31, 32, 33 and 34 operate according to the mapping curve of the rotational speed of the 4 compressors in Figure 3 (i.e. the line segment D1D2 in Figure 3 ); when 40% < dehumidification demand information < 43%, the variable frequency compressor 31 performs the turning-off logic, and the variable frequency compressors 32, 33 and 34 are frequency-boosted to the target mapping rotational speed.

[0170] When 43% < dehumidification demand information < 60%, the variable frequency compressors 32, 33 and 34 operate according to the mapping curve of the rotational speed of the 3 compressors in Figure 3 (i.e. the line segment C1C2 in Figure 3 ); when 60% < dehumidification demand information < 63%, the variable frequency compressor 33 performs the turning-off logic, and the variable frequency compressors 32 and 34 are frequency-boosted to the target mapping rotational speed.

[0171] When 63% < dehumidification demand information < 80%, the variable frequency compressors 32 and 34 operate according to the mapping curve of the rotational speed of the 2 compressors in Figure 3 (i.e. the line segment B1B2 in Figure 3 ); when 80% < dehumidification demand information < 83%, the variable frequency compressor 32 performs the turning-off logic, and the variable frequency compressor 34 is frequency-boosted to the target mapping rotational speed.

[0172] When the dehumidification demand information > 100%, the variable frequency compressor 34 performs the turning-off logic.

[0173] Please refer to Figure 10 , which shows a flowchart of the compressor system control method provided by an exemplary embodiment of the present application. The method is performed by the controller, as shown in Figure 10As shown, the method can include the following step 1010 and step 1020.

[0174] Step 1010: Obtain an environment parameter, which is obtained by an environment sensor and sent to a controller.

[0175] Step 1020: Control at least one variable frequency compressor in the compressor system based on the environment parameter.

[0176] Based on the scheme shown in each of the above embodiments of the present application, in a possible implementation scheme, the above-mentioned environment sensor includes a temperature sensor, and the above-mentioned environment parameter includes a temperature detection value; the above-mentioned step 1020 can be implemented as:

[0177] Step 1020a: Obtain a refrigeration demand CFC information based on the difference between the temperature detection value and a temperature setting value;

[0178] Step 1020b: In response to the CFC information satisfying a specified condition, control at least one variable frequency compressor in the compressor system to start or stop according to the CFC information.

[0179] Based on the scheme shown in each of the above embodiments of the present application, in a possible implementation scheme, the above-mentioned specified condition includes a compressor start condition; the step 1020b can be implemented as:

[0180] In response to the CFC information satisfying the compressor start condition, start a first variable frequency compressor in a first subsystem of the compressor system; the first subsystem is a subsystem in the compressor system in which the number of started variable frequency compressors is the least, and the first variable frequency compressor is a variable frequency compressor with the shortest cumulative running time among the variable frequency compressors that have not been started in the first subsystem.

[0181] Based on the scheme shown in each of the above embodiments of the present application, in a possible implementation scheme, the above-mentioned specified condition includes a compressor stop condition; the step 1020b can be implemented as:

[0182] In response to the CFC information satisfying the compressor stop condition, stop a second variable frequency compressor in a second subsystem of the compressor system; the second subsystem is a subsystem in the compressor system in which the number of started variable frequency compressors is the most, and the second variable frequency compressor is a variable frequency compressor with the longest cumulative running time among the variable frequency compressors that have been started in the second subsystem.

[0183] Based on the scheme shown in each of the above embodiments of the present application, in a possible implementation scheme, the above-mentioned environment sensor includes a humidity sensor, and the environment parameter includes a humidity detection value; the above-mentioned step 1020 can be implemented as:

[0184] Obtain dehumidification demand information through the difference between the humidity detection value and a humidity setting value;

[0185] In response to the dehumidification demand information satisfying the specified condition, at least one variable frequency compressor in the compressor system is controlled to be turned on or turned off according to the dehumidification demand information.

[0186] As to the method in the above embodiment, the specific manner in which each step performs the operation has been described in detail in the embodiment related to the compressor system; the technical effects achieved by the operation of each step are the same as those in the embodiment related to the compressor system, and will not be described in detail here.

[0187] The above Figure 2 The embodiment shown in the above The embodiment shown in the above

[0188] At partial load, the variable frequency compressors in different refrigeration systems are preferentially turned on to solve the problem of low utilization rate of the condenser and the evaporator; when the number of turned-on compressors is 1, 2, 3, or 4, different compressor control mapping curves are used to solve the unstable problem of compressor adjustment according to the proportional-integral-derivative (PID) control; when the load is added or reduced, the turned-on compressors can respond to the impact of the air supply and return air temperature due to the turning-on or turning-off of the compressors, and the change in demand, to solve the problem of uncontrollable and unstable air supply temperature caused by the addition or reduction of the compressor load.

[0189] When there is a turned-on or turned-off compressor in the system, the air supply temperature will change abruptly, which in turn causes the change of the refrigeration demand CFC; at this time, the turned-on compressor adjusts its speed according to the CFC, thereby stabilizing the air supply temperature; for example, when there is a turned-off compressor in the system, the refrigeration demand CFC will inevitably rise, and the turned-on compressor will increase its speed, thereby reducing the air supply temperature and maintaining the air supply temperature fluctuation within an acceptable range.

[0190] Please refer to Figure 11 , which shows a block diagram of a controller of a compressor system according to an exemplary embodiment of the present application, which can be used to perform the method as shown in Figure 8 , the controller comprises:

[0191] The acquisition module 1101 is configured to acquire an environmental parameter, which is acquired by an environmental sensor and sent to the controller.

[0192] The control module 1102 is configured to control at least one variable frequency compressor in the compressor system based on the environmental parameter.

[0193] In some embodiments, the environmental sensor comprises a temperature sensor, and the environmental parameter comprises a temperature detection value;

[0194] The control module 1102 is configured to obtain refrigeration demand CFC information based on a difference between the temperature detection value and a temperature setting value.

[0195] The control module 1102 is configured to control at least one variable frequency compressor in the compressor system to be turned on or turned off according to the CFC information in response to the CFC information satisfying a specified condition.

[0196] In some embodiments, the specified condition comprises a compressor turning-on condition.

[0197] The control module 1102 is configured to turn on a first variable frequency compressor in a first subsystem of the compressor system in response to the CFC information satisfying the compressor turning-on condition; the first subsystem is a subsystem in the compressor system in which the number of turned-on variable frequency compressors is the least, and the first variable frequency compressor is a variable frequency compressor with the shortest cumulative running time among the turned-off variable frequency compressors in the first subsystem.

[0198] In some embodiments, the specified condition comprises a compressor turning-off condition.

[0199] The control module 1102 is configured to turn off a second variable frequency compressor in a second subsystem of the compressor system in response to the CFC information satisfying the compressor turning-off condition; the second subsystem is a subsystem in the compressor system in which the number of turned-on variable frequency compressors is the most, and the second variable frequency compressor is a variable frequency compressor with the longest cumulative running time among the turned-on variable frequency compressors in the second subsystem.

[0200] In some embodiments, the environmental sensor comprises a humidity sensor, and the environmental parameter comprises a humidity detection value.

[0201] The control module 1102 is configured to obtain dehumidification demand information through a difference between the humidity detection value and a humidity setting value.

[0202] The control module is configured to control at least one variable frequency compressor in the compressor system to be turned on or turned off according to the dehumidification demand information in response to the dehumidification demand information satisfying a specified condition.

[0203] It should be noted that the apparatus provided by the above embodiments is only used as an example to illustrate the division of the above functional modules in achieving its functions, and in actual application, the above functions can be completed by different functional modules according to actual needs, that is, the content structure of the device is divided into different functional modules to complete all or part of the above described functions.

[0204] As to the apparatus in the above-mentioned embodiments, the specific manners in which the respective modules perform operations have been described in detail in the embodiments related to the method; the technical effects achieved by the respective modules performing operations are the same as the technical effects in the embodiments related to the method, and will not be described in detail here.

[0205] In an example embodiment, a computer program product is also provided, which includes computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor reads and executes the computer instructions from the computer readable storage medium to implement the compressor system control method provided by the above-mentioned method embodiments.

[0206] In an example embodiment, a computer readable storage medium is also provided, which stores computer instructions, and the computer instructions are loaded and executed by a processor to implement the compressor system control method provided by the above-mentioned method embodiments.

[0207] Those skilled in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by hardware, or by program instructing relevant hardware, and the program can be stored in a computer readable storage medium, and the storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0208] Those skilled in the art should realize that, in one or more examples described above, the functions described in the embodiments of the present application can be implemented by hardware, software, firmware or any combination thereof. When implemented by software, these functions can be stored in a computer readable medium or transmitted as one or more instructions or codes on a computer readable medium. The computer readable medium includes computer storage medium and communication medium, wherein the communication medium includes any medium that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0209] The above-mentioned is only optional embodiments of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A compressor system characterized by, The system comprises at least one subsystem, the subsystem comprising a condenser group, a compressor group and an evaporator group; The condenser group comprises at least two condensers, the compressor group comprises at least two variable frequency compressors, and the evaporator group comprises at least two evaporators; One end of each variable frequency compressor is in communication with each condenser, the other end of each variable frequency compressor is in communication with each evaporator, and each condenser is in communication with each evaporator.

2. The system of claim 1, wherein, The system further comprises a controller; The controller is electrically connected to each variable frequency compressor in at least one subsystem; The controller is configured to control the working state of the variable frequency compressor.

3. The system of claim 2, wherein, The system comprises at least two subsystems, and the evaporators of the at least two subsystems correspond to the same air supply outlet.

4. The system of claim 1 or 2, wherein, The system further comprises an environmental sensor comprising at least one of a temperature sensor and a humidity sensor, and the environmental sensor is electrically connected to the controller; The environmental sensor is configured to acquire an environmental parameter and send the environmental parameter to the controller; The controller is configured to control at least one variable frequency compressor in the compressor system based on the environmental parameter.

5. The system of claim 4, wherein, The environmental sensor comprises a temperature sensor, and the environmental parameter comprises a temperature detection value; The controller is configured to acquire a cooling demand CFC information through a difference between the temperature detection value and a temperature set value, and to control at least one variable frequency compressor in the compressor system to be turned on or turned off according to the CFC information in response to the CFC information satisfying a specified condition.

6. The system of claim 5, wherein, The specified condition comprises a compressor turning-on condition, and the controller is configured to turn on a first variable frequency compressor in a first subsystem of the compressor system in response to the CFC information satisfying the compressor turning-on condition; The first subsystem is the subsystem in the compressor system in which the number of turned-on variable frequency compressors is the least, and the first variable frequency compressor is the variable frequency compressor with the shortest cumulative running time among the turned-off variable frequency compressors in the first subsystem.

7. The system of claim 5, wherein, The specified condition comprises a compressor turning-off condition, and the controller is configured to turn off a second variable frequency compressor in a second subsystem of the compressor system in response to the CFC information satisfying the compressor turning-off condition; the second subsystem is the subsystem in the compressor system in which the number of turned-on variable frequency compressors is the most, and the second variable frequency compressor is the variable frequency compressor with the longest cumulative running time among the turned-on variable frequency compressors in the second subsystem.

8. The system of claim 5, wherein, The controller is configured to, acquire the temperature detection value at a first sampling time and the temperature detection value at a second sampling time; the first sampling time is a current sampling time, and the second sampling time is earlier than the first sampling time; acquire the CFC information through a difference between the temperature detection value at the first sampling time and the temperature set value, and a difference between the temperature detection value at the second sampling time and the temperature set value.

9. The system of claim 4, wherein, The environmental sensor comprises a humidity sensor, and the environmental parameter comprises a humidity detection value; The controller is configured to obtain dehumidification demand information based on a difference between the humidity detection value and a humidity set value, and to control at least one of the variable frequency compressors in the compressor system to be turned on or turned off according to the dehumidification demand information in response to the dehumidification demand information satisfying a specified condition.

10. A compressor system control method characterized by, The compressor system comprises the system according to any one of claims 4 to 9, and the method is executed by the controller and comprises: obtaining an environmental parameter, which is obtained by the environmental sensor and sent to the controller; controlling at least one of the variable frequency compressors in the compressor system based on the environmental parameter.

11. The method of claim 10, wherein, The environmental sensor comprises a temperature sensor, and the environmental parameter comprises a temperature detection value; The step of controlling at least one of the variable frequency compressors in the compressor system based on the environmental parameter comprises: obtaining cooling demand CFC information based on a difference between the temperature detection value and a temperature set value; controlling at least one of the variable frequency compressors in the compressor system to be turned on or turned off according to the CFC information in response to the CFC information satisfying a specified condition.

12. The method of claim 11, wherein, The specified condition comprises a compressor turning-on condition. The step of controlling at least one of the variable frequency compressors in the compressor system to be turned on or turned off according to the CFC information in response to the CFC information satisfying a specified condition comprises: turning on a first variable frequency compressor in a first subsystem of the compressor system in response to the CFC information satisfying the compressor turning-on condition, wherein the first subsystem is the subsystem in which the number of turned-on variable frequency compressors is the least in the compressor system, and the first variable frequency compressor is the variable frequency compressor with the least cumulative running time among the turned-off variable frequency compressors in the first subsystem. The specified condition comprises a compressor turning-off condition.

13. The method of claim 11, wherein, The step of controlling at least one of the variable frequency compressors in the compressor system to be turned on or turned off according to the CFC information in response to the CFC information satisfying a specified condition comprises: turning off a second variable frequency compressor in a second subsystem of the compressor system in response to the CFC information satisfying the compressor turning-off condition, wherein the second subsystem is the subsystem in which the number of turned-on variable frequency compressors is the most in the compressor system, and the second variable frequency compressor is the variable frequency compressor with the most cumulative running time among the turned-on variable frequency compressors in the second subsystem. The environmental sensor comprises a humidity sensor, and the environmental parameter comprises a humidity detection value; 14. The method of claim 10, wherein, The step of controlling at least one of the variable frequency compressors in the compressor system based on the environmental parameter comprises: obtaining dehumidification demand information based on a difference between the humidity detection value and a humidity set value; controlling at least one of the variable frequency compressors in the compressor system to be turned on or turned off according to the dehumidification demand information in response to the dehumidification demand information satisfying a specified condition. The compressor system comprises the system according to any one of claims 4 to 9, and the controller comprises:

15. A controller for a compressor system, characterized by ​ An acquisition module is configured to acquire an environmental parameter, which is acquired by the environmental sensor and sent to the controller. A control module is configured to control at least one variable frequency compressor in the compressor system based on the environmental parameter.

16. A computer readable storage medium characterized by: The computer readable storage medium stores at least one computer instruction, which is loaded and executed by the processor to implement the control method of the compressor system according to any one of claims 10 to 14.

17. A computer program product, characterised in that, The computer program product comprises computer instructions stored in a computer readable storage medium, which are read and executed by the processor of the computer device to implement the control method of the compressor system according to any one of claims 10 to 14.

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