WO2023045287A1

WO2023045287A1 - Multi-split heat pump system and control method therefor, and computer-readable storage medium

Info

Publication number: WO2023045287A1
Application number: PCT/CN2022/082329
Authority: WO
Inventors: 陶骙; 钟文朝; 黎顺全; 张�浩
Original assignee: 广东美的制冷设备有限公司
Priority date: 2021-09-27
Filing date: 2022-03-22
Publication date: 2023-03-30
Also published as: CN113834150B; CN113834150A

Abstract

Disclosed in the present application is a control method for a multi-split heat pump system, the multi-split heat pump system comprising a compressor, at least one hydraulic module and at least one air-conditioner indoor unit, wherein the at least one hydraulic module and the at least one air-conditioner indoor unit are both connected to the compressor. The method comprises: acquiring first energy demand information of at least one air-conditioner indoor unit and second energy demand information of at least one hydraulic module, wherein the first energy demand information represents a heating capacity requirement condition of the at least one air-conditioner indoor unit, and the second energy demand information represents a heating capacity requirement condition of the at least one hydraulic module; and adjusting an operation frequency of a compressor according to target parameters that correspond to the first energy demand information and the second energy demand information. Further disclosed in the present application are a multi-split heat pump system and a computer-readable storage medium.

Description

Multi-connected heat pump system, control method thereof, and computer-readable storage medium

related application

This application claims priority to a Chinese patent application with application number 202111137871.4 filed on September 27, 2021, the entire contents of which are hereby incorporated by reference.

technical field

The present application relates to the technical field of multi-connected heat pump systems, and in particular to a control method of a multi-connected heat pump system, a multi-connected heat pump system and a computer-readable storage medium.

Background technique

With the development of economy and technology, multi-connected heat pump systems are more and more widely used in daily life. For example, the air source heat pump adds a hydraulic module to provide capillary floor radiant heating, radiator heating, etc., and can also provide a heat source for the domestic water storage tank.

At present, in a multi-connected system with an indoor air duct unit and a hydraulic module, the operating frequency of the outdoor compressor is generally adjusted according to the preset fixed exhaust pressure or the temperature in the middle of the coil of the air duct inner unit, which is easy. The output capacity of the compressor does not match the actual heat exchange demand in the room, resulting in the inability to effectively balance the indoor environment temperature regulation and the heat supply of the hydraulic module.

application content

The main purpose of this application is to provide a control method for a multi-connected heat pump system, a multi-connected heat pump system, and a computer-readable storage medium, aiming at accurately matching the output capacity of the compressor with the actual heat exchange demand in the room, so that the indoor environment temperature can be adjusted Effectively balance with the heat supply of the hydraulic module.

To achieve the above purpose, the present application provides a control method for a multi-connected heat pump system, the multi-connected heat pump system includes a compressor, at least one hydraulic module and at least one air-conditioning indoor unit, the at least one hydraulic module and the at least one The indoor units of the air conditioner are all connected to the compressor, and the control method of the multi-connected heat pump system includes the following steps:

Acquire the first energy demand information of the at least one air-conditioning indoor unit and the second energy demand information of the at least one hydraulic module; the first energy demand information represents the heating capacity demand of the at least one air-conditioning indoor unit, so The second energy demand information characterizes the heating capacity demand of the at least one hydraulic module;

The operating frequency of the compressor is adjusted according to the target parameters corresponding to the first energy demand information and the second energy demand information.

In one embodiment, the step of adjusting the operating frequency of the compressor according to the target parameters corresponding to the first energy demand information and the second energy demand information includes:

In response to the fact that the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, the operation of the compressor is adjusted according to the temperature of the indoor heat exchanger of the currently turned on air-conditioning indoor unit frequency, the target parameters include the indoor heat exchanger temperature;

In response to the first energy demand information being that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information being the heating capacity required by the at least one hydraulic module When the heat is greater than the second preset value, the operating frequency of the compressor is adjusted according to the outlet water temperature of the hydraulic module, and the target parameter includes the outlet water temperature.

In one embodiment, in response to the fact that the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, according to the indoor heat exchanger of the currently turned on air-conditioning indoor unit The step of temperature adjusting the operating frequency of the compressor comprises:

determining a first frequency correction value according to the temperature of the indoor heat exchanger and the preset temperature of the heat exchanger;

obtaining a first target frequency after adjusting the initial frequency of the compressor according to the first frequency correction value;

The compressor is controlled to operate at the first target frequency.

In one embodiment, the step of determining the first frequency correction value according to the temperature of the indoor heat exchanger and the preset temperature of the heat exchanger includes:

determining a first temperature difference value between the preset heat exchanger temperature and the indoor heat exchanger temperature;

In response to the fact that the first temperature difference is greater than or equal to a first preset temperature difference, a first target correction value is the first frequency correction value;

In response to the situation when the first temperature difference is smaller than a second preset temperature difference, the second target correction value is the first frequency correction value;

The second preset temperature difference is less than or equal to the first preset temperature difference, the first target frequency corresponding to the first target correction value is greater than the initial frequency, and the second target correction value corresponds to the The first target frequency is less than the initial frequency.

In one embodiment, before the step of adjusting the operating frequency of the compressor according to the temperature of the indoor heat exchanger of the currently turned-on air conditioner indoor unit, the step further includes:

In response to the fact that the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, the discharge pressure of the compressor is acquired;

determining the condensing temperature of the currently opened air conditioner indoor unit according to the exhaust pressure, and the temperature of the indoor heat exchanger includes the condensing temperature;

Or, in response to the fact that the first energy demand information is that the heating capacity demanded by the at least one air-conditioning indoor unit is greater than a first preset value, obtain the rated heating capacity of the currently turned on air-conditioning indoor unit and its corresponding indoor heat exchanger coil temperature;

Determine the weight value of each air-conditioning indoor unit that is currently turned on according to the rated heat output;

The indoor heat exchanger temperature is determined according to the coil temperature and its corresponding weight value.

In one embodiment, after the step of acquiring the first energy demand information of the at least one air conditioner indoor unit and the second energy demand information of the at least one hydraulic module, it further includes:

In response to the fact that the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, acquiring installation status information of the pressure sensor on the discharge side of the compressor;

In response to the fact that the installation status information is that the pressure sensor is not installed on the discharge side of the compressor, the step of obtaining the discharge temperature of the compressor and the step of determining the current open pressure sensor according to the discharge temperature are performed. Steps for the condensing temperature of the indoor unit of the air conditioner;

In response to the fact that the installation status information is that the pressure sensor has been installed on the discharge side of the compressor, the step of obtaining the rated heat output of the currently turned on air conditioner indoor unit and the coil temperature of the corresponding indoor heat exchanger is performed. steps, the step of determining the weight value of each currently turned on air-conditioning indoor unit according to the rated heat output, and the step of determining the temperature of the indoor heat exchanger according to the coil temperature and its corresponding weight value.

In one embodiment, when the first energy demand information is that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information is the When the heating capacity required by at least one hydraulic module is greater than a second preset value, the step of adjusting the operating frequency of the compressor according to the outlet water temperature of the hydraulic module includes:

determining the current first condensation temperature of the hydraulic module according to the outlet water temperature;

determining a second frequency correction value according to the first condensing temperature and a target condensing temperature;

obtaining a second target frequency after adjusting the initial frequency of the compressor according to the second frequency correction value;

The compressor is controlled to operate at the second target frequency.

In one embodiment, the step of determining the current first condensation temperature of the hydraulic module according to the outlet water temperature includes:

determining a temperature correction value according to the outlet water temperature and the set water temperature of the hydraulic module;

Obtaining a reference condensing temperature after correcting the preset condensing temperature according to the temperature correction value;

The first condensation temperature is determined according to the reference condensation temperature.

In one embodiment, the step of determining the temperature correction value according to the outlet water temperature and the set water temperature of the hydraulic module includes:

determining a second temperature difference between the set water temperature and the outlet water temperature;

determining a temperature adjustment value according to the second temperature difference value;

obtaining the temperature correction value after adjusting the set water temperature according to the temperature adjustment value;

Wherein, the temperature adjustment value shows an increasing trend with the increase of the second temperature difference value, and/or, the temperature adjustment value shows a decreasing trend with the decrease of the second temperature difference value.

In one embodiment, the step of determining the first condensation temperature according to the reference condensation temperature includes:

In response to the fact that the reference condensing temperature is within a preset temperature range, the reference condensing temperature is the first condensing temperature;

In response to the fact that the reference condensing temperature is less than a minimum critical value of the preset temperature range, the minimum critical value is the first condensing temperature;

In response to the fact that the reference condensing temperature is greater than a maximum critical value of the preset temperature range, the maximum critical value is the first condensing temperature.

In one embodiment, before the step of determining the first condensing temperature according to the reference condensing temperature, it further includes:

Obtaining the outdoor ambient temperature and the current operating frequency of the compressor;

The maximum critical value is determined according to the outdoor ambient temperature and the operating frequency.

In one embodiment, the step of determining a second frequency correction value according to the first condensing temperature and the target condensing temperature includes:

determining a third temperature difference value between the target condensation temperature and the second condensation temperature;

In response to the situation that the third temperature difference is greater than or equal to a third preset temperature difference, a third target correction value is the second frequency correction value;

In response to the fact that the third temperature difference is smaller than a fourth preset temperature difference, a fourth target correction value is the second frequency correction value;

The fourth preset temperature difference is less than or equal to the third preset temperature difference, the second target frequency corresponding to the third target correction value is greater than the initial frequency, and the fourth target correction value corresponds to the The second target frequency is less than the initial frequency.

In one embodiment, the response to the first energy demand information is that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information is the In the case where the heating capacity required by at least one hydraulic module is greater than the second preset value, the step of adjusting the operating frequency of the compressor according to the outlet water temperature of the hydraulic module includes:

determining a third target frequency according to the first target temperature difference, the second target temperature difference, the outlet water temperature, and the set water temperature of the hydraulic module;

The compressor is controlled to operate at the third target frequency.

Wherein, the first target temperature difference is the temperature difference between the first actual condensing temperature and the set condensing temperature of the hydraulic module at the current moment, and the second target temperature difference is the last adjustment based on the outlet water temperature of the hydraulic module. The temperature difference between the second actual condensing temperature of the hydraulic module and the set condensing temperature at the frequency of the compressor, the first actual condensing temperature is the parameter corresponding to the outlet water temperature, and the second actual condensing temperature is the set Describe the parameters corresponding to the outlet water temperature.

In one embodiment, the step of determining the third target frequency according to the first target temperature difference, the second target temperature difference, the outlet water temperature and the set water temperature of the hydraulic module includes:

determining a third temperature difference between the first target temperature difference and the second target temperature difference, and determining a fourth temperature difference between the set water temperature and the outlet water temperature;

determining a target frequency adjustment value according to the third temperature difference value and the fourth temperature difference value;

obtaining the third target frequency after adjusting the current operating frequency of the compressor according to the target frequency adjustment value;

Wherein, the third target frequency shows an increasing trend with the increase of the third temperature difference value, and the third target frequency shows an increasing trend with the increase of the fourth temperature difference value.

In one embodiment, while or after the step of adjusting the operating frequency of the compressor according to the target parameters corresponding to the first energy demand information and the second energy demand information, it further includes:

Adjusting the opening degree of the first electronic expansion valve of the air-conditioning indoor unit, so that the temperature difference between the actual heat exchange temperature of the air-conditioning indoor unit and the first target heat exchange temperature is smaller than the first set temperature difference;

And/or, adjust the opening degree of the second electronic expansion valve of the hydraulic module, so that the temperature difference between the actual heat exchange temperature of the hydraulic module and the second target heat exchange temperature is smaller than the second set temperature difference;

Wherein, the first target heat exchange temperature and/or the second target heat exchange temperature are determined according to the first energy demand information and the second energy demand information.

In one embodiment, the step of adjusting the opening degree of the first electronic expansion valve of the air conditioner indoor unit includes:

Acquiring the current first heat exchange temperature of the air conditioner indoor unit;

determining a first opening adjustment value according to a first deviation value between the first heat exchange temperature and the first target heat exchange temperature;

adjusting the opening of the first electronic expansion valve according to the first opening adjustment value;

Wherein, the first opening degree adjustment value tends to increase with the increase of the first deviation value.

In one embodiment, the step of adjusting the opening degree of the second electronic expansion valve of the hydraulic module includes:

Obtaining the first temperature of the refrigerant inlet of the hydraulic module and the second temperature of the refrigerant outlet of the hydraulic module;

determining a second heat exchange temperature of the hydraulic module according to the first temperature and the second temperature;

determining a second opening adjustment value according to a second deviation value between the second heat exchange temperature and the second target heat exchange temperature;

adjusting the opening of the second electronic expansion valve according to the second opening adjustment value;

Wherein, the second opening degree adjustment value tends to increase with the increase of the second deviation value.

In addition, in order to achieve the above purpose, the present application also proposes a multi-connection heat pump system, the multi-connection heat pump system includes:

compressor;

at least one hydraulic module;

At least one air-conditioning indoor unit, the at least one hydraulic module and the at least one air-conditioning indoor unit are both connected to the compressor;

The control device, the compressor, the at least one hydraulic module, and the at least one air-conditioning indoor unit are all connected to the control device, and the control device includes: a memory, a processor, and stored in the memory and can be The control program of the multi-connection heat pump system running on the processor, when the control program of the multi-connection heat pump system is executed by the processor, the steps of the control method of the multi-connection heat pump system as described in any one of the above are realized.

In addition, in order to achieve the above object, the present application also proposes a computer-readable storage medium, the computer-readable storage medium stores a control program of a multi-connection heat pump system, and the control program of the multi-connection heat pump system is executed by a processor When implementing the steps of the control method for a multi-connected heat pump system as described in any one of the above.

A control method for a multi-connected heat pump system proposed in this application is based on a multi-connected heat pump system in which a compressor is connected to at least one hydraulic module and at least one air-conditioning indoor unit. The first energy demand information and the second energy demand information determine the corresponding target parameters to regulate the frequency of the compressor, so as to ensure that the output capacity of the compressor can meet the actual heat exchange demand of the indoor unit of the air conditioner and the hydraulic module at the same time, and realize the compressor. The output capacity is accurately matched with the actual indoor heat exchange demand, so that the indoor environment temperature adjustment and the heat supply of the hydraulic module can be effectively balanced.

Description of drawings

Fig. 1 is the schematic structural diagram of the multi-line heat pump system of the present application;

FIG. 2 is a schematic diagram of the hardware structure involved in the operation of an embodiment of the multi-connected heat pump system of the present application;

FIG. 3 is a schematic flowchart of an embodiment of a control method for a multi-connected heat pump system of the present application;

FIG. 4 is a schematic flowchart of another embodiment of the control method of the multi-connected heat pump system of the present application;

Fig. 5 is a schematic flowchart of another embodiment of the control method of the multi-connected heat pump system of the present application;

Fig. 6 is a numerical relationship diagram between the second temperature difference value and the temperature adjustment value involved in the embodiment in Fig. 5;

Fig. 7 is a schematic flowchart of another embodiment of the control method of the multi-connected heat pump system of the present application;

Fig. 8 is a schematic flowchart of another embodiment of the control method of the multi-connected heat pump system of the present application.

The realization, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

The main solution of the embodiment of the present application is to propose a control method based on a multi-connected heat pump system, the multi-connected heat pump system includes a compressor, at least one hydraulic module and at least one air-conditioning indoor unit, the at least one hydraulic module and the The at least one air-conditioning indoor unit is connected to the compressor, and the method includes: acquiring first energy demand information of the at least one air-conditioning indoor unit and second energy demand information of the at least one hydraulic module; the first The energy demand information represents the heating capacity demand of the at least one air conditioner indoor unit, and the second energy demand information represents the heating capacity demand of the at least one hydraulic module; according to the first energy demand information and the second The target parameter corresponding to the information can be used to adjust the operating frequency of the compressor.

In the prior art, in a multi-connected system with an indoor air ducted unit and a hydraulic module, the operating frequency of the outdoor compressor is generally set according to the preset fixed exhaust pressure or the temperature in the middle of the coil of the air ducted internal unit. It is easy to make the output capacity of the compressor mismatch with the actual heat exchange demand in the room, resulting in frequent shutdown of the compressor.

This application provides the above-mentioned solution, aiming to realize the precise matching between the output capacity of the compressor and the actual heat exchange demand in the room, so that the indoor environment temperature adjustment and the heat supply of the hydraulic module can be effectively balanced.

The embodiment of the present application proposes a multi-connection heat pump system.

In the embodiment of the present application, referring to Fig. 1 and Fig. 2, the multi-connected heat pump system includes a compressor 1, at least one hydraulic module 2, at least one air conditioner indoor unit 3 and a control device. The compressor 1, at least one hydraulic module 2, and at least one air conditioner indoor unit 3 are all connected to the control device.

In this embodiment, the number of air-conditioning indoor units 3 and hydraulic modules 2 is more than one. In other embodiments, the number of air-conditioning indoor units 3 and hydraulic modules 2 can also be set according to actual needs.

At least one hydraulic module 2 and at least one air conditioner indoor unit 3 can be arranged in the same space or distributed in different space areas according to actual needs. The different spatial regions here specifically refer to mutually separated spatial regions.

The hydraulic module 2 is provided with a water channel and a refrigerant flow channel. A first electronic expansion valve 21 is arranged on the refrigerant flow path to regulate the refrigerant flow in the refrigerant flow path. The refrigerant flow path exchanges heat with the water path to provide heat for the water in the water path. The compressor 1 , the outdoor heat exchanger 4 , the throttling device and the refrigerant flow path in the hydraulic module 2 are sequentially connected to form a refrigerant circulation loop. Wherein, the inlet and outlet of the refrigerant flow path of the hydraulic module 2 are provided with a first temperature sensor 01 and a second temperature sensor 02 respectively, which are set to detect the first temperature of the refrigerant inlet and the second temperature of the refrigerant outlet of the hydraulic module 2 . The outlet of the water flow path of the hydraulic module 2 is provided with a third temperature sensor 03 to detect the outlet water temperature of the hydraulic module 2 .

In this embodiment, the hydraulic module 2 can be connected with at least one floor heating module and/or at least one hot water module to provide heat for the floor heating module (such as a capillary floor or a radiator, etc.) and/or the hot water module. Specifically, the water outlet of the hydraulic module 2 is connected to the water inlet of the floor heating module, the water outlet of the floor heating module is connected to the water inlet of the hydraulic module 2, and the water circuit in the hydraulic module 2 is connected to the floor heating module to form a water circulation loop; the hydraulic module 2 The water outlet of the hot water module is connected to the water inlet of the hot water module, the water outlet of the hot water module is connected to the water inlet of the hydraulic module 2, and the water circuit in the hydraulic module 2 is connected with the hot water module to form a water circulation loop.

The air conditioner indoor unit 3 includes an indoor heat exchanger 31 and a second electronic expansion valve 32 connected to the indoor heat exchanger 31 , the second electronic expansion valve can regulate the flow of refrigerant flowing into the indoor heat exchanger 31 . The air-conditioning indoor unit 3 also includes a fan arranged corresponding to the indoor heat exchanger 31, which can drive the indoor air to pass through the indoor heat exchanger 31 for heat exchange and drive the heat-exchanged air into the room. The indoor heat exchanger 31 is provided with a fourth temperature sensor 04 configured to detect the coil temperature of the indoor heat exchanger 31 .

The discharge side of the compressor may be provided with a pressure sensor 05, which is configured to detect the discharge pressure of the compressor.

In the embodiment of the present application, referring to FIG. 2 , the control device of the multi-connected heat pump system includes: a processor 1001 (such as a CPU), a memory 1002, a timer 1003 and the like. The memory 1002 can be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1002 may also be a storage device independent of the foregoing processor 1001 .

The above-mentioned compressor 1, hydraulic module 2, air conditioner indoor unit 3, first temperature sensor 01, second temperature sensor 02, third temperature sensor 03, fourth temperature sensor 04 and pressure sensor 05 can all be connected to the control device here .

Those skilled in the art can understand that the structure of the device shown in FIG. 2 does not constitute a limitation to the device, and may include more or less components than shown in the figure, or combine some components, or arrange different components.

As shown in Fig. 2, the memory 1002, which is a kind of computer-readable storage medium, may include the control program of the multi-line heat pump system. In the device shown in FIG. 2 , the processor 1001 can be configured to call the control program of the multi-connected heat pump system stored in the memory 1002, and execute related steps of the control method of the multi-connected heat pump system in the following embodiments.

The embodiment of the present application also provides a control method for a multi-connection heat pump system, which is applied to control the above-mentioned multi-connection heat pump system.

Referring to FIG. 3 , an embodiment of a control method for a multi-connected heat pump system of the present application is proposed. In this embodiment, the control method of the multi-connected heat pump system includes:

Step S10, acquiring the first energy demand information of the at least one air-conditioning indoor unit and the second energy demand information of the at least one hydraulic module; the first energy demand information represents the heating capacity demand of the at least one air-conditioning indoor unit situation, the second energy demand information characterizes the heating capacity demand of the at least one hydraulic module;

It should be noted that the first energy demand information represents the heating capacity demand of all air conditioner indoor units connected to the compressor, and the second energy demand information represents the heating capacity demand of all hydraulic modules connected to the compressor.

Specifically, the first energy demand here can be determined based on whether all air-conditioning indoor units are turned on and the temperature attainment of the room temperature when turned on (such as whether the indoor temperature reaches the set temperature, the temperature deviation between the indoor temperature and the set temperature, etc.) The information can be based on whether all hydraulic modules are turned on and the temperature of the water temperature when turned on (such as whether the outlet water temperature reaches the set water temperature, the temperature deviation between the outlet water temperature and the set water temperature, etc.).

Wherein, the first energy demand information here can be characterized by the first energy demand value, and the first energy demand value is greater than the first set value (for example, greater than 0), indicating that the heating capacity required by at least one air-conditioning indoor unit is greater than the first preset value (such as greater than 0W), that is, there is currently an open air-conditioning indoor unit and the room temperature of the operating space of the open air-conditioning indoor unit has not reached the set temperature of the indoor unit; the first energy demand value is less than or equal to the first set value (eg equal to 0) indicates that the heating capacity required by at least one air-conditioning indoor unit is less than or equal to the first preset value (eg equal to 0W), that is, there are currently activated air-conditioning indoor units and the room temperature of the active space of the activated air-conditioning indoor units has reached The set temperature of the indoor unit is reached. The second energy demand information here can be characterized by a second energy demand value, and the second energy demand value is greater than the second set value (for example, greater than 0) indicating that the heating capacity required by at least one hydraulic module is greater than the second preset value (for example, greater than 0W), that is, there is currently an open hydraulic module and the water temperature (such as the outlet water temperature) of the open hydraulic module does not reach the set water temperature of the hydraulic module; the second energy demand value is less than or equal to the second set value (such as equal to 0) indicates that the heating capacity required by at least one hydraulic module is less than or equal to the second preset value (for example, equal to 0W), that is, there is currently an activated hydraulic module and the water temperature of the activated hydraulic module has reached the set water temperature of the hydraulic module.

Step S20, adjusting the operating frequency of the compressor according to the target parameters corresponding to the first energy demand information and the second energy demand information.

The target parameter here is specifically an adjustment basis for adjusting the operating frequency of the compressor.

Different first energy demand information and different second energy demand information correspond to different target parameters. The target parameter can be the first operating characteristic parameter of the indoor unit of the air conditioner (indoor heat exchanger temperature, the room temperature of the space where the indoor unit is located and/or the speed of the fan in the indoor unit, etc.) and the second operating characteristic parameter of the hydraulic module (such as water temperature, hydraulic power, etc.) One of the electronic expansion valve opening of the module and/or the room temperature of the space where the hydraulic module is located, etc.). Specifically, one of the first operating characteristic parameter and the second operating characteristic parameter may be determined as the target parameter according to the first energy demand information and the second energy demand information, and the operating frequency of the compressor may be regulated according to the determined target parameter . Specifically, the target frequency of the compressor operation can be determined according to the target parameters, and the compressor can be controlled to run at the target frequency; the adjustment direction of the compressor frequency can also be determined according to the target parameters (such as increasing, maintaining the same or decreasing), according to the set The determined adjustment direction adjusts the operating frequency of the compressor.

In other embodiments, the target parameter may also include the first operating characteristic parameter and the second operating characteristic parameter mentioned above. Different first energy demand information and different second energy demand information may correspond to different first operating characteristic parameters and second operating characteristic parameters. Based on this, the first operating characteristic parameter and the second operating characteristic parameter and their corresponding first weight value and second weight value can be determined according to the first energy demand information and the second energy demand information, and the first operating characteristic parameter can be determined according to The first frequency, the second frequency is determined according to the second operating characteristic parameter, and the target frequency for compressor operation is calculated according to the first frequency and its corresponding first weight value, the second frequency and its corresponding second weight value, according to the The determined target frequency controls compressor operation.

A control method for a multi-connected heat pump system proposed in the embodiment of the present application is based on a multi-connected heat pump system in which a compressor is connected to at least one hydraulic module and at least one air-conditioning indoor unit. The method is based on characterizing the actual needs of the air-conditioning indoor unit and the hydraulic module The first energy demand information and the second energy demand information of the heating capacity determine the corresponding target parameters to regulate the frequency of the compressor, so as to ensure that the output capacity of the compressor can meet the actual heat exchange demand of the indoor unit of the air conditioner and the hydraulic module at the same time, and realize the compression The output capacity of the machine is accurately matched with the actual indoor heat exchange demand, so that the indoor environment temperature adjustment and the heat supply of the hydraulic module can be effectively balanced.

Further, in the above embodiment, step S20 includes:

The first energy demand information is when the heating capacity required by at least one air-conditioning indoor unit is greater than the first preset value, that is, when the air-conditioning indoor unit connected to the compressor has energy demand or has a large energy demand, regardless of whether the second energy demand information is Whether the heating capacity required by at least one hydraulic module is greater than the second preset value or is less than or equal to the second preset value, at this time, based on the temperature of the indoor heat exchangers of all air-conditioning indoor units currently turned on or the required heating capacity is greater than the first preset value The temperature of the indoor heat exchanger of the air conditioner indoor unit regulates the operating frequency of the compressor, which is conducive to ensuring that the heat output by the compressor can meet the temperature adjustment requirements of the space where the indoor unit is located and the heating demand of the hydraulic module.

The temperature of the indoor heat exchanger can be determined according to the temperature data detected by the temperature sensor installed on the coil of the indoor heat exchanger, or it can be determined according to the operating parameters related to the temperature of the indoor heat exchanger in the outdoor unit (such as the discharge pressure of the compressor and/or Exhaust temperature, etc.)

Specifically, the temperature of the outlet water can be detected by a temperature sensor arranged at the water outlet of the hydraulic module.

In response to the fact that the first energy demand information is that the heating capacity required by at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information is that the heating capacity required by at least one hydraulic module is greater than the second preset value , that is, the indoor unit of the air conditioner connected to the compressor has no energy demand or the energy demand is small, while the hydraulic module connected to the compressor has energy demand or is relatively large. The frequency is adjusted to ensure that the indoor environment temperature adjustment requirements are met while avoiding excessive heat output by the compressor, avoiding frequent shutdowns of the compressor caused by the outlet water temperature of the hydraulic module reaching the set water temperature, and ensuring the operation stability of the compressor and The continuity of the heat supply of the multi-connected heat pump system.

In other embodiments, the first energy demand information is a first energy demand value determined based on the heating capacity required by all air-conditioning indoor units, and the second energy demand information is a second energy demand value determined based on the heating capacity required by all hydraulic modules , when the first energy demand value is greater than the second energy demand value, the above-mentioned indoor heat exchanger temperature target parameter can be determined, and the operating frequency of the compressor can be adjusted according to the indoor heat exchanger temperature; when the first energy demand value is less than or equal to For the second energy demand value, the outlet water temperature of the hydraulic module can be determined as the target parameter, and the operating frequency of the compressor can be regulated according to the outlet water temperature of the hydraulic module.

Further, another embodiment of the control method for the multi-connected heat pump system of the present application is proposed based on the above embodiments. In this embodiment, referring to FIG. 4 , in response to the fact that the first energy demand information is that the heating capacity demanded by the at least one air-conditioning indoor unit is greater than a first preset value, according to the currently turned on air-conditioning indoor unit The step of adjusting the operating frequency of the compressor by the temperature of the indoor heat exchanger comprises:

Step S21, in response to the fact that the first energy demand information is that the heating capacity demanded by the at least one air conditioner indoor unit is greater than a first preset value, determine a second heat exchanger temperature according to the indoor heat exchanger temperature and the preset heat exchanger temperature. a frequency correction value;

Here, the preset heat exchanger temperature specifically refers to a preset target value of the temperature that needs to be reached by the indoor heat exchanger of the air conditioner indoor unit during the heating process.

Different indoor heat exchanger temperatures and preset heat exchanger temperatures may correspond to different first frequency correction values. A first correspondence between the temperature of the indoor heat exchanger, the preset temperature of the heat exchanger, and the first frequency correction value is established in advance, and the first correspondence can be a calculation relationship, a mapping relationship, and the like. Based on the first corresponding relationship, the current first frequency correction value can be obtained by looking up a table or calculating according to the temperature of the indoor heat exchanger and the preset temperature of the heat exchanger.

Specifically, in this embodiment, a first temperature difference value between the indoor heat exchanger temperature and the preset heat exchanger temperature is determined; in response to the first temperature difference value being greater than or equal to the first preset temperature difference In the case of , the first target correction value is the first frequency correction value; in response to the situation that the first temperature difference value is less than the second preset temperature difference, the second target correction value is the first frequency correction value; the The second preset temperature difference is less than or equal to the first preset temperature difference, the first target frequency corresponding to the first target correction value is greater than the initial frequency, and the first target frequency corresponding to the second target correction value The target frequency is less than the initial frequency. In this embodiment, the first temperature difference is the difference between the preset heat exchanger temperature M and the indoor heat exchanger temperature N (ie M-N), the first preset temperature difference is greater than 0, and the second preset temperature difference is less than 0 . Based on this, when the first temperature difference value is greater than or equal to the first preset temperature difference, it indicates that the preset heat exchanger temperature is higher than the indoor heat exchanger temperature, and the deviation is large. At this time, the first target correction value is used to increase the initial frequency to obtain the first A target frequency is conducive to quickly increasing the actual heat exchange temperature of the indoor unit of the air conditioner to the preset heat exchanger temperature; when the first temperature difference is smaller than the second preset temperature difference, it indicates that the preset heat exchanger temperature is lower than the indoor heat exchanger temperature , and the deviation is large, at this time, the first target frequency is obtained by reducing the initial frequency by the second target correction value.

Specifically, define X = preset heat exchanger temperature - indoor heat exchanger temperature, then the corresponding frequency correction value can be determined according to the following table to adjust the initial frequency of the compressor:

第一温差值(℃(The first temperature difference (℃(	X＜-3X<-3	-3≤X＜-2-3≤X<-2	-2≤X＜-1-2≤X<-1	-1≤X＜1-1≤X<1	1≤X＜21≤X<2	2≤X＜32≤X<3	X≥3X≥3
频率修正值(Hz(Frequency correction value (Hz(	-5-5	-2-2	-1-1	00	+1+1	+2+2	+3+3

Wherein, 1 in the above table is the above-mentioned first preset temperature, and -1 in the above table is the above-mentioned second preset temperature.

Step S22, obtaining a first target frequency after adjusting the initial frequency of the compressor according to the first frequency correction value;

The initial frequency here can be a preset fixed frequency, or the current operating frequency of the compressor.

Specifically, the initial frequency may be increased, decreased or maintained according to the first frequency correction value to obtain the first target frequency. In this embodiment, the first frequency correction value can represent both the frequency correction direction and the frequency correction magnitude, and the sum of the first frequency correction value and the initial frequency can be used as the first target frequency. In other embodiments, the first frequency correction value may only represent the frequency correction range, then after determining the frequency adjustment direction according to the indoor heat exchanger temperature and the preset heat exchanger temperature, when the frequency adjustment direction is to reduce the initial frequency, The difference between the initial frequency and the first frequency correction value can be used as the first target frequency; when the frequency adjustment direction is to increase the initial frequency, the sum of the initial frequency and the first frequency correction value can be used as the first target frequency.

Step S23, controlling the compressor to run at the first target frequency.

When the compressor runs at the first target frequency, the actual heat exchange temperature of the air conditioner indoor unit can maintain the preset heat exchanger temperature.

In this embodiment, when at least one air-conditioning indoor unit has energy demand or has a large energy demand, the frequency of the compressor is regulated in the above-mentioned manner to ensure that the heat exchange temperature of the air-conditioning indoor unit can be maintained at the preset heat exchanger temperature , to meet the temperature regulation needs of the indoor environment.

Further, in this embodiment, before the step of adjusting the operating frequency of the compressor according to the temperature of the indoor heat exchanger of the currently opened air conditioner indoor unit, the currently opened air conditioner may be obtained in one of the following two ways: The temperature of the indoor heat exchanger of the indoor unit of the air conditioner is used to regulate the frequency of the compressor:

Way 1: In response to the fact that the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, obtain the discharge pressure of the compressor; determine according to the discharge pressure The condensing temperature of the currently turned on air conditioner indoor unit, the temperature of the indoor heat exchanger includes the condensing temperature.

Specifically, a quantitative relationship between the exhaust pressure and the condensing temperature may be preset, and based on the quantitative relationship, the condensing temperature of the currently turned on air-conditioning indoor unit is determined through calculation of the exhaust pressure. Alternatively, a mapping table of exhaust pressure and condensing temperature may be preset, and the condensing temperature of the currently turned on air-conditioning indoor unit may be obtained by querying the mapping table through the exhaust pressure.

It should be noted that the condensing temperature here represents the temperature value of the comprehensive situation of the saturation temperatures of the indoor heat exchangers of all the indoor air conditioners that are currently turned on during the condensation process.

Way 2: In response to the fact that the first energy demand information is that the heating capacity demanded by the at least one air-conditioning indoor unit is greater than a first preset value, obtain the rated heating capacity of the currently turned-on air-conditioning indoor unit and its corresponding indoor heat exchange The coil temperature of the air conditioner; the weight value of each currently turned on air conditioner indoor unit is determined according to the rated heat output; the indoor heat exchanger temperature is determined according to the coil temperature and its corresponding weight value.

For example, there are currently n sets of indoor units that can be required, and the rated heat output is n1, n2, n3...nx KW respectively, and the coil temperature of each indoor unit corresponds to T21, T22, T23...T2x°C, then the temperature of the indoor heat exchanger

Further, in this embodiment, after step S10, further comprising: in response to the fact that the first energy demand information indicates that the heating capacity demanded by the at least one air-conditioning indoor unit is greater than a first preset value, acquiring the compression The installation status information of the pressure sensor on the exhaust side of the compressor; in response to the fact that the installation status information is that the pressure sensor is not installed on the exhaust side of the compressor, the temperature of the indoor heat exchanger is obtained according to the above method 1; in response to the The above installation status information refers to the situation that the pressure sensor has been installed on the exhaust side of the compressor, and the temperature of the indoor heat exchanger can be obtained according to the second method above. The installation state information here can be determined by obtaining the instruction input by the user.

Here, through the above method, it can be ensured whether a pressure sensor is installed on the discharge side of the compressor, and the temperature of the indoor heat exchanger representing the heat exchange condition of the currently opened air conditioner indoor unit can also be effectively obtained.

Furthermore, based on any of the above embodiments, another embodiment of the control method of the multi-connected heat pump system of the present application is proposed. In this embodiment, referring to FIG. 5 , the response to the first energy demand information is that the heating capacity demanded by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand When the required information is that the heating capacity required by the at least one hydraulic module is greater than a second preset value, the step of adjusting the operating frequency of the compressor according to the outlet water temperature of the hydraulic module includes:

Step S201, in response to the first energy demand information being that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information is that the at least one hydraulic module When the required heating capacity is greater than the second preset value, determine the current first condensation temperature of the hydraulic module according to the outlet water temperature;

The first condensation temperature here is specifically the saturation temperature of the water output by the hydraulic module during the heat exchange process (such as the saturation temperature of the capillary floor or the radiator during the heat exchange process).

Different outlet water temperatures correspond to different first condensation temperatures. The second corresponding relationship between the outlet water temperature and the first condensation temperature can be preset, and can be a calculation formula, a mapping table, and the like. Based on the second corresponding relationship, the outlet water temperature can be calculated or the mapping table can be queried to obtain the first condensation temperature here.

Step S202, determining a second frequency correction value according to the first condensing temperature and the target condensing temperature;

The target condensation temperature here is specifically the target value of the preset temperature that the hydraulic module needs to reach during the heating process.

Different first condensing temperatures and target condensing temperatures may correspond to different second frequency correction values. A third corresponding relationship among the first condensing temperature, the target condensing temperature, and the second frequency correction value is established in advance, and the third corresponding relationship may be a calculation relationship, a mapping relationship, and the like. Based on the third corresponding relationship, the current second frequency correction value can be obtained by looking up a table or calculating according to the first condensing temperature and the target condensing temperature.

Specifically, in this embodiment, a third temperature difference between the target condensation temperature and the second condensation temperature is determined; when the third temperature difference is greater than or equal to a third preset temperature difference, the third temperature difference is determined. The target correction value is the second frequency correction value; when the third temperature difference is less than the fourth preset temperature difference, determine the fourth target correction value as the second frequency correction value; the fourth preset temperature difference is less than or equal to the third preset temperature difference, the second target frequency corresponding to the third target correction value is greater than the initial frequency, and the second target frequency corresponding to the fourth target correction value is less than the initial frequency frequency. In this embodiment, the third temperature difference is the difference between the preset heat exchanger temperature P and the indoor heat exchanger temperature Q (ie P-Q), the third preset temperature difference is greater than 0, and the fourth preset temperature difference is less than 0 . Based on this, when the third temperature difference value is greater than or equal to the third preset temperature difference, it indicates that the target condensation temperature is greater than the first condensation temperature, and the deviation is relatively large. At this time, the second target frequency is obtained by increasing the initial frequency by the third target correction value, It is conducive to the rapid increase of the actual heat exchange temperature of the hydraulic module to the target condensation temperature; when the third temperature difference is less than the fourth preset temperature difference, it indicates that the target condensation temperature is lower than the first condensation temperature, and the deviation is large. At this time, the fourth target is corrected The value reduces the initial frequency to get the second target frequency.

Specifically, define Y=target condensing temperature-first condensing temperature, then the corresponding frequency correction value can be determined according to the following table to adjust the initial frequency of the compressor:

第三温差值(℃(The third temperature difference (℃(	Y＜-3Y<-3	-3≤Y＜-2-3≤Y<-2	-2≤Y＜-1-2≤Y<-1	-1≤Y＜1-1≤Y<1	1≤Y＜21≤Y<2	2≤Y＜32≤Y<3	Y≥3Y≥3
频率修正值(Hz(Frequency correction value (Hz(	-5-5	-2-2	-1-1	00	+1+1	+2+2	+3+3

Wherein, 1 in the above table is the above-mentioned third preset temperature, and -1 in the above table is the above-mentioned fourth preset temperature.

Step S203, obtaining a second target frequency after adjusting the initial frequency of the compressor according to the second frequency correction value;

The initial frequency here can be a preset fixed frequency, or the current running frequency of the compressor.

Specifically, the initial frequency may be increased, decreased or maintained according to the second frequency correction value to obtain the second target frequency. In this embodiment, the second frequency correction value can represent both the frequency correction direction and the frequency correction magnitude, and the sum of the second frequency correction value and the initial frequency can be used as the second target frequency. In other embodiments, the second frequency correction value may only represent the frequency correction range, then after the frequency adjustment direction is determined according to the indoor heat exchanger temperature and the preset heat exchanger temperature, when the frequency adjustment direction is to reduce the initial frequency, The difference between the initial frequency and the second frequency correction value can be used as the second target frequency; when the frequency adjustment direction is to increase the initial frequency, the sum of the initial frequency and the second frequency correction value can be used as the second target frequency.

Step S204, controlling the compressor to run at the second target frequency.

In this embodiment, when at least one air-conditioning indoor unit has no energy demand or the energy demand is relatively small and the hydraulic module has energy demand or is relatively large, the frequency of the compressor is regulated according to the above-mentioned method, which can ensure the temperature regulation of the indoor environment While the demand is met, the output capacity of the compressor can match the heat demanded by the hydraulic module, so as to prevent the water temperature of the hydraulic module from reaching the set water temperature too quickly, and effectively prevent the compressor from frequently reaching the temperature and shutting down.

Further, in this embodiment, the step of determining the current first condensation temperature of the hydraulic module according to the outlet water temperature includes:

Step S201a, determining a temperature correction value according to the outlet water temperature and the set water temperature of the hydraulic module;

The set water temperature here is specifically the target value to be achieved by the outlet water temperature of the preset hydraulic module. The set water temperature may be the temperature set by the user, or may be the temperature determined according to the target temperature set by the user for the target object heated by the hydraulic module.

Specifically, the temperature correction value can be obtained by calculating the outlet water temperature and the set water temperature. For example, the difference between the outlet water temperature and the set temperature can be used as the temperature correction value. The temperature correction value can also be obtained by querying the preset mapping table through the outlet water temperature and the set water temperature.

Specifically, in this embodiment, a second temperature difference between the set water temperature and the outlet water temperature is determined; a temperature adjustment value is determined according to the second temperature difference; and the setting is adjusted according to the temperature adjustment value. The temperature correction value is obtained after the water temperature is fixed; wherein, the temperature adjustment value shows an increasing trend with the increase of the second temperature difference value, and/or, the temperature adjustment value increases with the decrease of the second temperature difference value A small decreasing trend. In this embodiment, the second temperature difference is specifically the difference between the set water temperature and the outlet water temperature; in other embodiments, the second temperature difference may also be the absolute value of the difference between the outlet water temperature and the set water temperature. The second temperature difference value can be directly used as the temperature adjustment value, or the temperature adjustment value can be obtained by calculating the second temperature difference value or looking up a table based on the preset correspondence between the temperature difference and the adjustment value. In this embodiment, the variation trend of the outlet water temperature can be obtained, and the corresponding relationship between the temperature difference and the adjustment value can be obtained based on the variation trend of the outlet water temperature. Different variation trends correspond to different corresponding relationships. When the outlet water temperature is increasing, the temperature adjustment value corresponding to the second temperature difference is determined based on the fourth correspondence, and when the outlet water temperature is decreasing, the temperature adjustment value corresponding to the second temperature difference is determined based on the fifth correspondence. As shown in FIG. 6 , the temperature adjustment value corresponding to the outlet water temperature in the fourth correspondence relationship is greater than the temperature adjustment value corresponding to the outlet water temperature in the fifth correspondence relationship. In this embodiment, the sum of the set water temperature and the temperature adjustment value is used as the temperature correction value. In other embodiments, the difference, product or ratio between the set water temperature and the temperature adjustment value can also be used as the temperature correction value.

Step S201b, obtaining a reference condensation temperature after correcting the preset condensation temperature according to the temperature correction value;

The preset condensation temperature is specifically a preset temperature value, which may be a preset fixed value, or may be a temperature selected from multiple preset temperature values according to the current set water temperature of the hydraulic module.

In this embodiment, the sum of the temperature correction value and the preset condensing temperature can be used as the reference condensing temperature. In other implementations, the difference, product or ratio between the preset condensing temperature and the temperature correction value may also be used as the reference condensing temperature.

Step S201c, determining the first condensation temperature according to the reference condensation temperature.

The reference condensing temperature obtained above can be directly used as the first condensing temperature, or the result after being corrected according to the preset fixed correction value can be used as the first condensing temperature, and the reference condensing temperature and the preset temperature interval can also be used Compared with the critical value, if the reference condensing temperature is within the preset temperature range, the reference condensing temperature can be directly used as the first condensing temperature; if the reference condensing temperature is outside the preset temperature range, the critical value of the preset temperature range can be used as the second - condensation temperature. The preset temperature range can be a first temperature range, a second temperature range or a third temperature range, the first temperature range is a temperature range with a minimum critical value but not a maximum critical value, and the second temperature range is a temperature range with a maximum critical value but not a maximum critical value. The temperature interval does not have a minimum critical value, and the third temperature interval is a temperature interval with both a minimum critical value and a maximum critical value.

In order to better illustrate the determination process of the first condensation temperature involved in this embodiment, a specific application of the scheme of this embodiment is provided below:

Definition: The first condensing temperature is Tw_cH, Tw-out is the outlet water temperature, Tw_cH0 is the preset condensing temperature (default 45°C, recommended value 40452°C), T1S is the set water temperature, k is the temperature correction value, C is the preset constant (default 45°C, recommended value 35450°C), △TWS is the second temperature difference value, △Trs is an intermediate parameter determined based on △TWS. Based on this, the first condensation temperature can be determined in conjunction with the following formula and Fig. 6: formula (1), Tw_cH=Tw_cH0+(T1S-C(+k; formula (2), k=ΔTrs-1, k value range:- 2≤k≤10.

Specifically, ΔTrs corresponding to ΔTWS is determined based on FIG. 2 , then k is calculated by ΔTrs and formula (2), and the first condensation temperature is further calculated by formula (1).

In this embodiment, the first condensing temperature is obtained after correcting the preset condensing temperature with the temperature correction value determined by combining the outlet water temperature of the hydraulic module and the set temperature, which can ensure that the obtained first condensing temperature can accurately represent the current hydraulic module To ensure the accuracy of compressor frequency regulation based on the determined first condensing temperature, to ensure that the output capacity of the compressor matches the actual heating demand of the hydraulic module, and to effectively avoid frequent shutdowns of the compressor .

Further, in this embodiment, the above-mentioned process of determining the first condensing temperature according to the reference condensing temperature is specifically as follows: in response to the reference condensing temperature being within a preset temperature range, the reference condensing temperature is the A first condensation temperature; in response to the reference condensation temperature being less than a minimum critical value of the preset temperature range, the minimum critical value being the first condensation temperature; in response to the reference condensation temperature being greater than the preset temperature A maximum critical value of the interval, where the maximum critical value is the first condensation temperature. The maximum critical value and the minimum critical value may be preset fixed temperature values, or may be parameter values determined according to the current operating conditions of the multi-connected heat pump system. In this embodiment, the recommended minimum critical value of the preset temperature range is 30°C, and the range is 25435°C. Here, the value of the first condensing temperature is limited by the preset temperature range, which can prevent the operating frequency of the compressor from being too high or too low due to the first condensing temperature being too high or too low, so as to ensure reliable and stable operation of the compressor.

Further, in this embodiment, before the step of determining the first condensing temperature according to the reference condensing temperature, it also includes: acquiring the outdoor ambient temperature and the current operating frequency of the compressor; The operating frequency determines the maximum threshold. Different outdoor ambient temperatures and different operating frequencies correspond to different maximum critical values. In this embodiment, the maximum critical value is obtained by querying a preset mapping table through the outdoor ambient temperature and operating frequency. In other embodiments, the maximum critical value here can also be obtained by calculating the outdoor ambient temperature, operating frequency and a preset formula.

For example, the maximum critical value can be obtained by querying the following table through the outdoor ambient temperature T4 and compressor frequency F:

Here, the maximum critical value of the first condensing temperature is determined in combination with the outdoor ambient temperature and the current operating frequency of the compressor, so that the first condensing temperature is limited based on the maximum critical value, ensuring that the operating frequency of the compressor can be adjusted according to the first condensing temperature. Further improve the reliability and stability of compressor operation.

Further, based on any of the above embodiments, another embodiment of the control method of the multi-connected heat pump system of the present application is proposed. In this embodiment, referring to FIG. 7 , the response to the first energy demand information is that the heating capacity demanded by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand When the required information is that the heating capacity required by the at least one hydraulic module is greater than a second preset value, the step of adjusting the operating frequency of the compressor according to the outlet water temperature of the hydraulic module includes:

Step S210, in response to the first energy demand information being that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information being that the at least one hydraulic module When the required heating capacity is greater than the second preset value, the third target frequency is determined according to the first target temperature difference, the second target temperature difference, the outlet water temperature, and the set water temperature of the hydraulic module;

Step S220, controlling the compressor to run at the third target frequency.

The outlet water temperature here is equivalent to the outlet water temperature at the corresponding moment. The process of determining the first actual condensing temperature and the second actual condensing temperature here may refer to the above-mentioned determining process of the first condensing temperature by analogy, which will not be repeated here. The set condensation temperature here is specifically the target value to be achieved by the preset first condensation temperature.

Wherein, step S10, step S210 and step S220 can be executed cyclically, based on which, in response to the first energy demand information, the heating capacity demanded by the at least one air-conditioning indoor unit is less than or equal to the first preset value, and The second energy demand information is the situation that the heating capacity required by the at least one hydraulic module is greater than the second preset value, and the current third target frequency is combined with the first actual condensing temperature of the hydraulic module and the set value during the cycle The temperature difference between the condensing temperatures and the temperature difference between the second actual condensing temperature of the hydraulic module and the set condensing temperature during the last third target frequency are determined.

Specifically, the preset corresponding relationship between the first target temperature difference, the second target temperature difference, the outlet water temperature and the set water temperature and the third target frequency can be preset. The preset corresponding relationship may be a calculation formula, a mapping table, and the like. Based on the preset corresponding relationship, the third target frequency here can be obtained by calculating and/or looking up a table through the first target temperature difference, the second target temperature difference, the outlet water temperature and the set water temperature.

In this embodiment, the third temperature difference between the first target temperature difference and the second target temperature difference is determined, and the fourth temperature difference between the set water temperature and the outlet water temperature is determined; according to the The third temperature difference value and the fourth temperature difference value determine a target frequency adjustment value; the third target frequency is obtained after adjusting the current operating frequency of the compressor according to the target frequency adjustment value; wherein, the third target frequency varies with The increase of the third temperature difference shows an increasing trend, and the third target frequency shows an increasing trend with the increase of the fourth temperature difference. In other words, the third target frequency has a decreasing trend with the decrease of the third temperature difference value, and the third target frequency has a decreasing trend with the decrease of the fourth temperature difference value.

In this embodiment, the third temperature difference is the difference between the first target temperature difference and the second target temperature difference, and the fourth temperature difference is the difference between the set water temperature and the outlet water temperature. In other embodiments, the third temperature difference may be the absolute value of the difference between the first target temperature difference and the second target temperature difference, and the fourth temperature difference may be the absolute value of the difference between the set water temperature and the outlet water temperature.

For example, you can use the third temperature difference value ΔT1 and the fourth temperature difference value ΔT2 to query the matching results in the following table as the target frequency adjustment value ΔF:

After ΔF is obtained through the query in the above table, the third target frequency=Fr+ΔF, where Fr is the current operating frequency of the compressor.

Further, based on any of the above embodiments, another embodiment of the control method of the multi-connected heat pump system of the present application is proposed. In this embodiment, referring to FIG. 8, while or after step S20 is executed, it also includes:

Step S30, adjusting the opening degree of the first electronic expansion valve of the air-conditioning indoor unit, so that the temperature difference between the actual heat exchange temperature of the air-conditioning indoor unit and the first target heat exchange temperature is smaller than the first set temperature difference; and/or , adjust the opening degree of the second electronic expansion valve of the hydraulic module, so that the temperature difference between the actual heat exchange temperature of the hydraulic module and the second target heat exchange temperature is smaller than the second set temperature difference; wherein, according to the first The energy demand information and the second energy demand information determine the first target heat exchange temperature and/or the second target heat exchange temperature.

When the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than the first preset value, the first target heat exchange temperature here is the temperature of the currently turned-on air-conditioning indoor unit mentioned in the above embodiment. Indoor heat exchanger temperature; when the first energy demand information is that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information is the at least one When the heating capacity required by the hydraulic module is greater than the second preset value, the second target heat exchange temperature here is the first condensation temperature mentioned in the above embodiment. For the specific determination process of the first target heat exchange temperature and the second target heat exchange temperature, reference may be made to the foregoing embodiments, and details are not repeated here.

The actual heat exchange temperature of the air conditioner indoor unit specifically refers to the coil temperature of the indoor heat exchanger; the actual heat exchange temperature of the hydraulic module is determined according to the temperature of the refrigerant flow path of the hydraulic module.

It should be noted that, when the number of air-conditioning indoor units is more than one, the first electronic expansion valve of each air-conditioning indoor unit is individually regulated based on its actual heat exchange temperature. The opening is adjusted in different ways, so that the actual heat exchange temperature of each air-conditioning indoor unit can reach the first target heat exchange temperature; when the number of hydraulic modules is more than one, the second electronic expansion valve of each hydraulic module is based on The actual heat exchange temperature is adjusted separately, and the opening of the corresponding second electronic expansion valve is adjusted in different ways if the actual heat exchange temperature is different, so that the actual heat exchange temperature of each hydraulic module can reach the second target heat exchange temperature.

In this embodiment, the electronic expansion valves of the air-conditioning indoor units and hydraulic modules are regulated according to the above-mentioned method, which can ensure the refrigerant balance obtained by each indoor unit and hydraulic module, and ensure that the indoor environment temperature adjustment requirements meet the heating requirements of the hydraulic modules at the same time. It is also beneficial to further improve the energy efficiency of the system.

Specifically, the first electronic expansion valve can be regulated according to the following process: obtain the current first heat exchange temperature of the air conditioner indoor unit; Determine the first opening adjustment value; adjust the opening of the first electronic expansion valve according to the first opening adjustment value; wherein, the first opening adjustment value increases with the increase of the first deviation value showing an increasing trend. Specifically, the coil temperature of the indoor heat exchanger in the indoor unit of the air conditioner may be acquired as the first heat exchange temperature here. Specifically, the first opening adjustment value here may be determined according to the difference or ratio between the first heat exchange temperature and the first target heat exchange temperature. When the first opening adjustment value is less than 0, reduce the opening of the first electronic expansion valve according to the first opening adjustment value; when the first opening adjustment value is greater than 0, increase the first electronic expansion valve opening according to the first opening adjustment value valve opening.

Specifically, the second electronic expansion valve can be regulated according to the following process: obtain the first temperature of the refrigerant inlet of the hydraulic module and the second temperature of the refrigerant outlet of the hydraulic module; Determine the second heat exchange temperature of the hydraulic module; determine a second opening adjustment value according to a second deviation value between the second heat exchange temperature and the second target heat exchange temperature; adjust the second opening degree according to the second opening degree The opening degree of the second electronic expansion valve is adjusted by a value; wherein, the second opening degree adjustment value tends to increase with the increase of the second deviation value. In this embodiment, the average value of the difference between the first temperature and the second temperature is used as the second heat exchange temperature to represent the equivalent coil temperature of the water circuit in the hydraulic module. In other embodiments, the minimum value of the first temperature and the second temperature or the difference between the first temperature and the second temperature may also be used as the second heat exchange temperature. Specifically, the second opening adjustment value here may be determined according to the difference or ratio between the second heat exchange temperature and the second target heat exchange temperature. When the second opening adjustment value is less than 0, reduce the second electronic expansion valve opening according to the second opening adjustment value; when the second opening adjustment value is greater than 0, increase the second electronic expansion valve opening according to the second opening adjustment value valve opening.

Wherein, after the opening value of the corresponding electronic expansion valve is adjusted according to the first opening adjustment value and/or the second opening adjustment value, a new first opening adjustment value and/or The new second opening adjustment value adjusts the corresponding opening value of the electronic expansion valve.

Specifically, if the difference between the first heat exchange temperature and the first target heat exchange temperature or the difference between the second heat exchange temperature and the second target heat exchange temperature is defined as Z, the corresponding opening adjustment can be determined according to the following mapping table value:

It can be seen from the above table that when the first heat exchange temperature is lower than the first target heat exchange temperature and the temperature deviation between the two temperatures is greater than the threshold value 1, the corresponding first electronic expansion valve operates with an increased opening and the opening adjustment varies with The increase of the temperature deviation shows an increasing trend; when the first heat exchange temperature is greater than the first target heat exchange temperature and the temperature deviation of the two temperatures is greater than the threshold value 2, the corresponding first electronic expansion valve operates with a reduced opening and The adjustment of the opening degree tends to increase with the increase of the temperature deviation. When the second heat exchange temperature is lower than the second target heat exchange temperature and the temperature deviation between the two temperatures is greater than the threshold 3, the corresponding second electronic expansion valve operates with an increased opening and the opening adjustment increases with the temperature deviation It shows an increasing trend; when the second heat exchange temperature is greater than the second target heat exchange temperature and the temperature deviation between the two temperatures is greater than the threshold 4, the corresponding second electronic expansion valve operates with a reduced opening and the opening adjustment varies with The temperature deviation increases with increasing trend.

In addition, the embodiment of the present application also proposes a computer-readable storage medium, the computer-readable storage medium stores a control program of a multi-connection heat pump system, and when the control program of the multi-connection heat pump system is executed by a processor, the above Relevant steps of any embodiment of the control method for a multi-connected heat pump system.

It should be noted that, as used herein, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or system comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or system. Without further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article or system comprising that element.

The serial numbers of the above embodiments of the present application are for description only, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product in essence or the part that contributes to the prior art, and the computer software product is stored in a storage medium as described above (such as ROM/RAM , magnetic disk, optical disk (include several instructions to make a terminal device (which can be a mobile phone, a computer, a server, a multi-connected heat pump system, or a network device, etc.) execute the methods described in the various embodiments of this application.

The above are only optional embodiments of the application, and are not intended to limit the patent scope of the application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the application, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of this application in the same way.

Claims

A method for controlling a multi-connected heat pump system, wherein the multi-connected heat pump system includes a compressor, at least one hydraulic module, and at least one air-conditioning indoor unit, and the at least one hydraulic module and the at least one air-conditioning indoor unit are connected to the The compressor is connected, and the control method of the multi-connected heat pump system includes the following steps:

Acquire the first energy demand information of the at least one air-conditioning indoor unit and the second energy demand information of the at least one hydraulic module; the first energy demand information represents the heating capacity demand of the at least one air-conditioning indoor unit, so The second energy demand information characterizes the heating capacity demand of the at least one hydraulic module;

The operating frequency of the compressor is adjusted according to the target parameters corresponding to the first energy demand information and the second energy demand information.
The control method of a multi-connected heat pump system according to claim 1, wherein the step of adjusting the operating frequency of the compressor according to the target parameters corresponding to the first energy demand information and the second energy demand information comprises:

In response to the fact that the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, the operation of the compressor is adjusted according to the temperature of the indoor heat exchanger of the currently turned on air-conditioning indoor unit frequency, the target parameters include the indoor heat exchanger temperature;

In response to the first energy demand information being that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information being the heating capacity required by the at least one hydraulic module When the heat is greater than the second preset value, the operating frequency of the compressor is adjusted according to the outlet water temperature of the hydraulic module, and the target parameter includes the outlet water temperature.
The control method for a multi-connected heat pump system according to claim 2, wherein, in response to the fact that the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, according to The step of adjusting the operating frequency of the compressor by the temperature of the indoor heat exchanger of the currently opened air-conditioning indoor unit includes:

In response to the fact that the first energy demand information is that the heating capacity required by the at least one air conditioner indoor unit is greater than a first preset value, determine a first frequency correction according to the indoor heat exchanger temperature and the preset heat exchanger temperature value;

obtaining a first target frequency after adjusting the initial frequency of the compressor according to the first frequency correction value;

The compressor is controlled to operate at the first target frequency.
The control method of a multi-connected heat pump system according to claim 3, wherein the step of determining the first frequency correction value according to the indoor heat exchanger temperature and the preset heat exchanger temperature comprises:

determining a first temperature difference value between the preset heat exchanger temperature and the indoor heat exchanger temperature;

In response to the fact that the first temperature difference is greater than or equal to a first preset temperature difference, a first target correction value is the first frequency correction value;

In response to the fact that the first temperature difference is smaller than a second preset temperature difference, a second target correction value is the first frequency correction value;

The second preset temperature difference is less than or equal to the first preset temperature difference, the first target frequency corresponding to the first target correction value is greater than the initial frequency, and the second target correction value corresponds to the The first target frequency is less than the initial frequency.
The control method for a multi-connected heat pump system according to claim 2, wherein before the step of adjusting the operating frequency of the compressor according to the temperature of the indoor heat exchanger of the currently turned on air conditioner indoor unit, further comprising:

In response to the fact that the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, the discharge pressure of the compressor is acquired;

determining the condensation temperature of the currently opened air conditioner indoor unit according to the exhaust pressure, and the temperature of the indoor heat exchanger includes the condensation temperature;

Or, in response to the fact that the first energy demand information is that the heating capacity demanded by the at least one air-conditioning indoor unit is greater than a first preset value, obtain the rated heating capacity of the currently turned on air-conditioning indoor unit and its corresponding indoor heat exchanger coil temperature;

Determine the weight value of each air-conditioning indoor unit that is currently turned on according to the rated heat output;

The indoor heat exchanger temperature is determined according to the coil temperature and its corresponding weight value.
The control method for a multi-connected heat pump system according to claim 5, wherein after the step of acquiring the first energy demand information of the at least one air-conditioning indoor unit and the second energy demand information of the at least one hydraulic module, Also includes:

In response to the fact that the first energy demand information is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, acquiring installation status information of the pressure sensor on the discharge side of the compressor;

In response to the fact that the installation status information is that the pressure sensor is not installed on the discharge side of the compressor, the step of obtaining the discharge temperature of the compressor and the step of determining the current open pressure sensor according to the discharge temperature are performed. Steps for the condensing temperature of the air conditioner indoor unit;

In response to the fact that the installation status information is that the pressure sensor has been installed on the discharge side of the compressor, the step of obtaining the rated heat output of the currently turned on air conditioner indoor unit and the coil temperature of the corresponding indoor heat exchanger is executed. steps, the step of determining the weight value of each currently turned on air-conditioning indoor unit according to the rated heat output, and the step of determining the temperature of the indoor heat exchanger according to the coil temperature and its corresponding weight value.
The control method of a multi-connected heat pump system according to claim 2, wherein said determining said first energy demand information is that the heating capacity required by said at least one air conditioner indoor unit is less than or equal to said first preset value, And the second energy demand information is that the heating capacity required by the at least one hydraulic module is greater than a second preset value, and the step of adjusting the operating frequency of the compressor according to the outlet water temperature of the hydraulic module includes:

In response to the first energy demand information being that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information being the heating capacity required by the at least one hydraulic module When the heat is greater than the second preset value, determine the current first condensation temperature of the hydraulic module according to the outlet water temperature;

determining a second frequency correction value according to the first condensing temperature and a target condensing temperature;

obtaining a second target frequency after adjusting the initial frequency of the compressor according to the second frequency correction value;

The compressor is controlled to operate at the second target frequency.
The control method of a multi-connected heat pump system according to claim 7, wherein the step of determining the current first condensation temperature of the hydraulic module according to the outlet water temperature comprises:

determining a temperature correction value according to the outlet water temperature and the set water temperature of the hydraulic module;

Obtaining a reference condensing temperature after correcting the preset condensing temperature according to the temperature correction value;

The first condensation temperature is determined according to the reference condensation temperature.
The control method of a multi-connected heat pump system according to claim 8, wherein the step of determining a temperature correction value according to the outlet water temperature and the set water temperature of the hydraulic module comprises:

determining a second temperature difference between the set water temperature and the outlet water temperature;

determining a temperature adjustment value according to the second temperature difference value;

obtaining the temperature correction value after adjusting the set water temperature according to the temperature adjustment value;

Wherein, the temperature adjustment value shows an increasing trend with the increase of the second temperature difference value, and/or, the temperature adjustment value shows a decreasing trend with the decrease of the second temperature difference value.
The control method of a multi-connected heat pump system according to claim 8, wherein said step of determining said first condensing temperature according to said reference condensing temperature comprises:

In response to the fact that the reference condensing temperature is within a preset temperature range, the reference condensing temperature is the first condensing temperature;

In response to a situation where the reference condensing temperature is less than a minimum critical value of the preset temperature range, the minimum critical value is the first condensing temperature;

In response to the fact that the reference condensing temperature is greater than a maximum critical value of the preset temperature range, the maximum critical value is the first condensing temperature.
The control method of a multi-connected heat pump system according to claim 10, wherein, before the step of determining the first condensing temperature according to the reference condensing temperature, further comprising:

Obtaining the outdoor ambient temperature and the current operating frequency of the compressor;

The maximum critical value is determined according to the outdoor ambient temperature and the operating frequency.
The control method for a multi-connected heat pump system according to claim 7, wherein the step of determining a second frequency correction value according to the first condensing temperature and the target condensing temperature comprises:

determining a third temperature difference value between the target condensation temperature and the second condensation temperature;

In response to the situation that the third temperature difference is greater than or equal to a third preset temperature difference, a third target correction value is the second frequency correction value;

In response to the fact that the third temperature difference is smaller than a fourth preset temperature difference, a fourth target correction value is the second frequency correction value;

The fourth preset temperature difference is less than or equal to the third preset temperature difference, the second target frequency corresponding to the third target correction value is greater than the initial frequency, and the fourth target correction value corresponds to the The second target frequency is less than the initial frequency.
The control method of a multi-connected heat pump system according to claim 2, wherein said determining said first energy demand information is that the heating capacity required by said at least one air conditioner indoor unit is less than or equal to said first preset value, And the second energy demand information is that the heating capacity required by the at least one hydraulic module is greater than a second preset value, and the step of adjusting the operating frequency of the compressor according to the outlet water temperature of the hydraulic module includes:

In response to the first energy demand information being that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to the first preset value, and the second energy demand information being the heating capacity required by the at least one hydraulic module When the heat is greater than the second preset value, the third target frequency is determined according to the first target temperature difference, the second target temperature difference, the outlet water temperature, and the set water temperature of the hydraulic module;

controlling the compressor to operate at the third target frequency;

Wherein, the first target temperature difference is the temperature difference between the first actual condensing temperature and the set condensing temperature of the hydraulic module at the current moment, and the second target temperature difference is the last adjustment based on the outlet water temperature of the hydraulic module. The temperature difference between the second actual condensing temperature of the hydraulic module and the set condensing temperature at the frequency of the compressor, the first actual condensing temperature is the parameter corresponding to the outlet water temperature, and the second actual condensing temperature is the set Describe the parameters corresponding to the outlet water temperature.
The control method of a multi-connected heat pump system according to claim 13, wherein said step of determining the third target frequency according to the first target temperature difference, the second target temperature difference, the outlet water temperature and the set water temperature of the hydraulic module include:

determining a third temperature difference between the first target temperature difference and the second target temperature difference, and determining a fourth temperature difference between the set water temperature and the outlet water temperature;

determining a target frequency adjustment value according to the third temperature difference value and the fourth temperature difference value;

obtaining the third target frequency after adjusting the current operating frequency of the compressor according to the target frequency adjustment value;

Wherein, the third target frequency shows an increasing trend with the increase of the third temperature difference value, and the third target frequency shows an increasing trend with the increase of the fourth temperature difference value.
The control method for a multi-connected heat pump system according to any one of claims 1 to 14, wherein the compressor operating frequency is adjusted according to the target parameters corresponding to the first energy demand information and the second energy demand information Simultaneously or after the steps are performed, also include:

Adjusting the opening degree of the first electronic expansion valve of the air-conditioning indoor unit, so that the temperature difference between the actual heat exchange temperature of the air-conditioning indoor unit and the first target heat exchange temperature is smaller than the first set temperature difference;

And/or, adjust the opening degree of the second electronic expansion valve of the hydraulic module, so that the temperature difference between the actual heat exchange temperature of the hydraulic module and the second target heat exchange temperature is smaller than the second set temperature difference;

Wherein, the first target heat exchange temperature and/or the second target heat exchange temperature are determined according to the first energy demand information and the second energy demand information.
The control method of a multi-connected heat pump system according to claim 15, wherein the step of adjusting the opening degree of the first electronic expansion valve of the indoor unit of the air conditioner comprises:

Acquiring the current first heat exchange temperature of the air conditioner indoor unit;

determining a first opening adjustment value according to a first deviation value between the first heat exchange temperature and the first target heat exchange temperature;

adjusting the opening of the first electronic expansion valve according to the first opening adjustment value;

Wherein, the first opening degree adjustment value tends to increase with the increase of the first deviation value.
The control method of a multi-connected heat pump system according to claim 15, wherein the step of adjusting the opening degree of the second electronic expansion valve of the hydraulic module comprises:

Obtaining the first temperature of the refrigerant inlet of the hydraulic module and the second temperature of the refrigerant outlet of the hydraulic module;

determining a second heat exchange temperature of the hydraulic module according to the first temperature and the second temperature;

determining a second opening adjustment value according to a second deviation value between the second heat exchange temperature and the second target heat exchange temperature;

adjusting the opening of the second electronic expansion valve according to the second opening adjustment value;

Wherein, the second opening degree adjustment value tends to increase with the increase of the second deviation value.
A multi-connection heat pump system, wherein the multi-connection heat pump system includes:

compressor;

at least one hydraulic module;

At least one air-conditioning indoor unit, the at least one hydraulic module and the at least one air-conditioning indoor unit are both connected to the compressor; and

The control device, the compressor, the at least one hydraulic module, and the at least one air-conditioning indoor unit are all connected to the control device, and the control device includes: a memory, a processor, and stored in the memory and can be The control program of the multi-connected heat pump system running on the processor, when the control program of the multi-connected heat pump system is executed by the processor, the multi-connected heat pump system according to any one of claims 1 to 17 is realized. The steps of the control method.
A computer-readable storage medium, wherein, the computer-readable storage medium stores a control program of a multi-connection heat pump system, and when the control program of the multi-connection heat pump system is executed by a processor, it implements claims 1 to 17 The steps of any one of the control methods of the multi-connected heat pump system.