CN113834150A

CN113834150A - Multi-online heat pump system, control method thereof and computer readable storage medium

Info

Publication number: CN113834150A
Application number: CN202111137871.4A
Authority: CN
Inventors: 陶骙; 钟文朝; 黎顺全; 张�浩
Original assignee: GD Midea Air Conditioning Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2021-12-24
Anticipated expiration: 2041-09-27
Also published as: CN113834150B; WO2023045287A1; EP4379272A1

Abstract

The invention discloses a control method of a multi-split heat pump system, the multi-split heat pump system comprises 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 air-conditioning indoor unit are both connected with the compressor, the method comprises the following steps: acquiring first energy demand information of at least one air conditioner indoor unit and second energy demand information of at least one hydraulic module; the first energy demand information represents the heating capacity demand condition of at least one air conditioner indoor unit, and the second energy demand information represents the heating capacity demand condition of at least one hydraulic module; and adjusting the running frequency of the compressor according to the target parameters corresponding to the first energy-demand information and the second energy-demand information. The invention also discloses a multi-online heat pump system and a computer readable storage medium. The invention aims to realize the accurate matching of the output capacity of the compressor and the indoor actual heat exchange requirement, so that the indoor environment temperature regulation and the heat supply of the hydraulic module are effectively considered.

Description

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

Technical Field

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

Background

With the development of economic technology, the application of the multi-split heat pump system in daily life is more and more extensive. For example, the air source heat pump is added with a hydraulic module, and can provide heat source for capillary floor radiant heating, radiator heating and the like, and also can provide heat source for a water storage tank of domestic water.

At present, in the indoor multi-split system that is equipped with tuber pipe indoor set and water conservancy module, generally according to the fixed exhaust pressure of presetting setting or the coil pipe middle part temperature of tuber pipe indoor set for the operating frequency that the target carries out outdoor compressor regulates and control, makes compressor output capacity mismatch with indoor actual heat transfer demand easily, leads to indoor ambient temperature to adjust and can't effectively compromise with water conservancy module heat supply.

Disclosure of Invention

The invention mainly aims to provide a control method of a multi-split heat pump system, the multi-split heat pump system and a computer readable storage medium, aiming at realizing accurate matching of the output capacity of a compressor and the indoor actual heat exchange requirement and effectively considering both indoor environment temperature regulation and water power module heat supply.

In order to achieve the above object, the present invention provides a method for controlling a multi-split heat pump system, where the multi-split 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 air-conditioning indoor unit are both connected to the compressor, and the method for controlling the multi-split heat pump system includes the following steps:

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

and adjusting the running frequency of the compressor according to the target parameters corresponding to the first energy-demand information and the second energy-demand information.

Optionally, the step of adjusting the operating frequency of the compressor according to the target parameters corresponding to the first information and the second information includes:

when the first energy-demand information indicates that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, adjusting the operating frequency of the compressor according to the temperature of an indoor heat exchanger of the currently started air-conditioning indoor unit, wherein the target parameter comprises the temperature of the indoor heat exchanger;

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

Optionally, when the first information that the heating capacity required by the at least one air conditioner indoor unit is greater than a first preset value, the step of adjusting the operating frequency of the compressor according to the temperature of the currently started indoor heat exchanger of the air conditioner indoor unit includes:

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

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

controlling the compressor to operate at the first target frequency.

Optionally, the step of determining a first frequency correction value according to the indoor heat exchanger temperature and a preset heat exchanger temperature includes:

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

when the first temperature difference value is larger than or equal to a first preset temperature difference, determining a first target correction value as the first frequency correction value;

when the first temperature difference value is smaller than a second preset temperature difference value, determining a second target correction value as the first frequency correction value;

the second preset temperature difference is smaller than or equal to the first preset temperature difference, the first target frequency corresponding to the first target correction value is larger than the initial frequency, and the first target frequency corresponding to the second target correction value is smaller than the initial frequency.

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

when 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 exhaust pressure of the compressor;

determining the condensation temperature of the currently started indoor unit of the air conditioner according to the exhaust pressure, wherein the temperature of the indoor heat exchanger comprises the condensation temperature;

or when the first information required is that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, acquiring the rated heating capacity of the currently opened air-conditioning indoor unit and the coil temperature of the corresponding indoor heat exchanger;

determining the weight value of each currently started air conditioner indoor unit according to the rated heating capacity;

and determining the temperature of the indoor heat exchanger according to the temperature of the coil pipe and the corresponding weight value of the coil pipe.

Optionally, after the step of acquiring the first information required by the at least one air-conditioning indoor unit and the second information required by the at least one water power module, the method further includes:

when 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, acquiring the installation state information of a pressure sensor on the exhaust side of the compressor;

if the installation state information indicates that the pressure sensor is not installed on the exhaust side of the compressor, executing the step of acquiring the exhaust temperature of the compressor and the step of determining the condensation temperature of the currently started air-conditioning indoor unit according to the exhaust temperature;

and if the installation state information indicates that the pressure sensor is installed on the exhaust side of the compressor, executing the step of acquiring the rated heating capacity of the currently-started air-conditioning indoor unit and the coil temperature of the indoor heat exchanger corresponding to the rated heating capacity, the step of determining the weight value of each currently-started air-conditioning indoor unit according to the rated heating capacity, and the step of determining the temperature of the indoor heat exchanger according to the coil temperature and the weight value corresponding to the coil temperature.

Optionally, when the first information that the amount of heat required by the at least one air-conditioning indoor unit is less than or equal to the first preset value and the second information that the amount of heat 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:

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

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

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

controlling the compressor to operate at the second target frequency.

Optionally, the step of determining a current first condensation temperature of the hydro 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;

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

determining the first condensing temperature based on the reference condensing temperature.

Optionally, the step of determining a temperature correction value according to the outlet water temperature and the set water temperature of the hydraulic module includes:

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

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

adjusting the set water temperature according to the temperature adjustment value to obtain the temperature correction value;

the temperature adjusting value is in an increasing trend along with the increase of the second temperature difference value, and/or the temperature adjusting value is in a decreasing trend along with the decrease of the second temperature difference value.

Optionally, the step of determining the first condensing temperature according to the reference condensing temperature comprises:

if the reference condensing temperature is within a preset temperature interval, determining the reference condensing temperature to be the first condensing temperature;

if the reference condensing temperature is smaller than the minimum critical value of the preset temperature interval, determining the minimum critical value as the first condensing temperature;

and if the reference condensing temperature is larger than the maximum critical value of the preset temperature interval, determining the maximum critical value as the first condensing temperature.

Optionally, before the step of determining the first condensing temperature according to the reference condensing temperature, the method further includes:

acquiring the outdoor ambient temperature and the current operating frequency of the compressor

Determining the maximum critical value according to the outdoor environment temperature and the operation frequency.

Optionally, the step of determining a second frequency correction value based on the first condensing temperature and the target condensing temperature comprises:

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

when the third temperature difference value is greater than or equal to a third preset temperature difference, determining a third target correction value as the second frequency correction value;

when the third temperature difference value is smaller than a fourth preset temperature difference value, determining a 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.

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;

controlling the compressor to operate at the third target frequency.

The first target temperature difference is a temperature difference value between a first actual condensation temperature of the hydraulic module and a set condensation temperature at the current moment, the second target temperature difference is a temperature difference value between a second actual condensation temperature of the hydraulic module and the set condensation temperature when the compressor frequency is adjusted according to the outlet water temperature of the hydraulic module last time, the first actual condensation temperature is a parameter corresponding to the outlet water temperature, and the second actual condensation temperature is a parameter corresponding to the outlet water temperature.

Optionally, the step of 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 water power module includes:

determining a third temperature difference value between the first target temperature difference and the second target temperature difference, and determining a fourth temperature difference value 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;

adjusting the current running frequency of the compressor according to the target frequency adjustment value to obtain a third target frequency;

the third target frequency is increased along with the increase of the third temperature difference value, and the third target frequency is increased along with the increase of the fourth temperature difference value.

Optionally, during or after the step of adjusting the operating frequency of the compressor according to the target parameters corresponding to the first information and the second information, the method further includes:

adjusting the opening degree of a first electronic expansion valve of the indoor unit of the air conditioner to enable the temperature difference between the actual heat exchange temperature of the indoor unit of the air conditioner and a first target heat exchange temperature to be smaller than a first set temperature difference;

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

and determining the first target heat exchange temperature and/or the second target heat exchange temperature according to the first energy-demand information and the second energy-demand information.

Optionally, the step of adjusting the opening degree of a first electronic expansion valve of the indoor unit of the air conditioner includes:

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

determining a first opening degree adjusting value according to a first deviation value of the first heat exchange temperature and the first target heat exchange temperature;

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

the first opening degree adjusting value is in an increasing trend along with the increase of the first deviation value.

Optionally, the step of adjusting the opening degree of the second electronic expansion valve of the hydro module comprises:

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

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

determining a second opening degree adjusting value according to a second deviation value of the second heat exchange temperature and the second target heat exchange temperature;

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

and the second opening degree adjusting value is in an increasing trend along with the increase of the second deviation value.

In addition, in order to achieve the above object, the present application also proposes a multi-split heat pump system, including:

a compressor;

at least one hydro module;

the at least one hydraulic module and the at least one air-conditioning indoor unit are connected with the compressor;

the compressor, the at least one water conservancy module and the at least one air conditioning indoor set all with controlling means connects, controlling means includes: the control method comprises the steps of a memory, a processor and a control program of the multi-online heat pump system stored on the memory and capable of running on the processor, wherein the control program of the multi-online heat pump system realizes the steps of the control method of the multi-online heat pump system when being executed by the processor.

Further, in order to achieve the above object, the present application also proposes a computer readable storage medium having stored thereon a control program of an on-line heat pump system, which when executed by a processor, implements the steps of the method of controlling an on-line heat pump system as described in any one of the above.

The invention provides a control method of a multi-split heat pump system, which is based on the multi-split heat pump system that a compressor is connected with at least one hydraulic module and at least one air-conditioning indoor unit.

Drawings

Fig. 1 is a schematic structural diagram of a multi-split heat pump system according to the present invention;

fig. 2 is a schematic diagram of a hardware structure involved in the operation of an embodiment of the multi-split heat pump system of the present invention;

fig. 3 is a schematic flow chart illustrating a control method of the multi-split heat pump system according to an embodiment of the present invention;

fig. 4 is a schematic flow chart illustrating a control method of the multi-split heat pump system according to another embodiment of the present invention;

fig. 5 is a schematic flow chart illustrating a control method of the multi-split heat pump system according to another embodiment of the present invention;

FIG. 6 is a graph of the relationship between the second temperature difference value and the temperature adjustment value according to the embodiment of FIG. 5;

fig. 7 is a schematic flow chart illustrating a control method of a multi-split heat pump system according to still another embodiment of the present invention;

fig. 8 is a schematic flow chart illustrating a control method of a multi-split heat pump system according to still another embodiment of the invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The main solution of the embodiment of the invention is as follows: a control method is provided based on a multi-split heat pump system, the multi-split heat pump system comprises 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 air-conditioning indoor unit are both connected with the compressor, and the method comprises the following steps: acquiring first energy and demand information of the at least one air-conditioning indoor unit and second energy and demand information of the at least one hydraulic module; the first energy-demand information represents the heating capacity demand condition of the at least one air-conditioning indoor unit, and the second energy-demand information represents the heating capacity demand condition of the at least one hydraulic module; and adjusting the running frequency of the compressor according to the target parameters corresponding to the first energy-demand information and the second energy-demand information.

In the prior art, in a multi-split system with an indoor air pipe indoor unit and a hydraulic module, the operation frequency of an outdoor compressor is generally regulated and controlled according to a preset fixed exhaust pressure or the temperature of the middle part of a coil pipe of the indoor air pipe indoor unit, so that the output capacity of the compressor is not matched with the indoor actual heat exchange requirement, and the compressor is frequently stopped.

The invention provides the solution, and aims to realize accurate matching of the output capacity of the compressor and the actual indoor heat exchange requirement, so that the indoor environment temperature regulation and the heat supply of the hydraulic module are effectively considered.

The embodiment of the invention provides a multi-online heat pump system.

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

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

The at least one hydraulic module 2 and the at least one air-conditioning indoor unit 3 can be arranged in the same space or distributed in different space areas according to actual requirements. The different spatial regions are in particular spatial regions which are separated from one another.

The hydraulic module 2 is provided with a water channel and a refrigerant channel. The refrigerant flow path is provided with a first electronic expansion valve 21 for regulating and controlling the refrigerant flow in the refrigerant flow path. The refrigerant flow path exchanges heat with the water path to supply heat to the water in the water path. The refrigerant flow paths in the compressor 1, the outdoor heat exchanger 4, the throttling device and the hydraulic module 2 are communicated in sequence to form a refrigerant circulation loop. The inlet and outlet of the coolant flow path of the hydraulic module 2 are respectively provided with a first temperature sensor 01 and a second temperature sensor 02 for detecting a first temperature of the coolant inlet and a second temperature of the coolant outlet of the hydraulic module 2. And a third temperature sensor 03 is arranged at the outlet of the water flow path of the hydraulic module 2 to detect the outlet water temperature of the hydraulic module 2.

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

The indoor unit 3 of the air conditioner includes an indoor heat exchanger 31 and a second electronic expansion valve 32 connected to the indoor heat exchanger 31, and the second electronic expansion valve can regulate the flow rate of the refrigerant flowing into the indoor heat exchanger 31. The indoor unit 3 of the air conditioner further comprises a fan arranged corresponding to the indoor heat exchanger 31, and the fan can drive indoor air to exchange heat through the indoor heat exchanger 31 and drive the air after heat exchange to be sent into the room. The indoor heat exchanger 31 is provided with a fourth temperature sensor 04 for detecting the coil temperature of the indoor heat exchanger 31.

The discharge side of the compressor may be provided with a pressure sensor 05 for detecting the discharge pressure of the compressor.

In an embodiment of the present invention, referring to fig. 2, a control apparatus of a multi-split heat pump system includes: a processor 1001 (e.g., a CPU), a memory 1002, a timer 1003, and the like. The memory 1002 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 1002 may alternatively be a storage device separate from the processor 1001.

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

Those skilled in the art will appreciate that the configuration of the device shown in fig. 2 is not intended to be limiting of the device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

As shown in fig. 2, a control program of the multi-on-line heat pump system may be included in the memory 1002 as a computer-readable storage medium. In the apparatus shown in fig. 2, the processor 1001 may be configured to call a control program of the multi-on-line heat pump system stored in the memory 1002, and perform operations of relevant steps of a control method of the multi-on-line heat pump system in the following embodiments.

The embodiment of the invention also provides a control method of the multi-online heat pump system, which is applied to control the multi-online heat pump system.

Referring to fig. 3, an embodiment of a control method of the multi-split heat pump system of the present application is provided. In this embodiment, the control method of the multi-split heat pump system includes:

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

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

Specifically, the first requirement information may be determined based on whether all the indoor air conditioners are turned on and on temperature reaching conditions of the room temperature (e.g., whether the indoor temperature reaches the set temperature, a temperature deviation between the indoor temperature and the set temperature, etc.), and the first requirement information may be determined based on whether all the hydraulic modules are turned on and on temperature reaching conditions of the water temperature (e.g., whether the outlet water temperature reaches the set water temperature, a temperature deviation between the outlet water temperature and the set water temperature, etc.).

The first energy demand information can be represented by a first energy demand value, and the first energy demand value is larger than a first set value (such as larger than 0), which indicates that the heating capacity required by at least one air-conditioning indoor unit is larger than a first preset value (such as larger than 0W), namely that an opened air-conditioning indoor unit exists currently and the room temperature of the opened air-conditioning indoor unit acting space does not reach the set temperature of the indoor unit; the first energy requirement value is less than or equal to a first set value (for example, equal to 0), which indicates that the heating capacity required by at least one air conditioner indoor unit is less than or equal to a first preset value (for example, equal to 0W), that is, there is an opened air conditioner indoor unit currently and the room temperature of the opened air conditioner indoor unit action space reaches the set temperature of the indoor unit. The second energy demand information can be represented by a second energy demand value, and the second energy demand value being greater than a second set value (e.g., greater than 0) indicates that the heating capacity required by at least one hydraulic module is greater than a second preset value (e.g., greater than 0W), that is, the opened hydraulic module exists currently and the water temperature (e.g., water outlet temperature) of the opened hydraulic module does not reach the set water temperature of the hydraulic module; the second energy demand value being less than or equal to a second set value (e.g., equal to 0) indicates that the heating capacity required by at least one hydraulic module is less than or equal to a second preset value (e.g., equal to 0W), that is, there is an open hydraulic module currently and the water temperature of the open hydraulic module has reached the set water temperature of the hydraulic module.

And step S20, adjusting the running 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 is a control criterion for controlling the operating frequency of the compressor.

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

In other embodiments, the target parameter may also include the first and second operating characteristic parameters described above. The different first energy-demand information and the different second energy-demand information may correspond to different first operating characteristic parameters and second operating characteristic parameters. Based on the method, a first operation characteristic parameter and a second operation characteristic parameter and a first weight value and a second weight value corresponding to the first operation characteristic parameter and the second operation characteristic parameter respectively can be determined according to first energy-demand information and second energy-demand information, a first frequency is determined according to the first operation characteristic parameter, a second frequency is determined according to the second operation characteristic parameter, a target frequency of compressor operation is obtained through calculation according to the first frequency and the first weight value corresponding to the first frequency, the second frequency and the second weight value corresponding to the second frequency, and the compressor operation is controlled according to the determined target frequency.

The method for controlling the multi-split heat pump system provided by the embodiment of the invention is based on the multi-split heat pump system with a compressor connected with at least one hydraulic module and at least one air-conditioning indoor unit, and the method determines corresponding target parameters to regulate and control the frequency of the compressor based on first energy demand information and second energy demand information representing the actual demands of the air-conditioning indoor unit and the hydraulic module on the basis of the heating capacity, so that the output capacity of the compressor can simultaneously meet the actual heat exchange capacity demands of the air-conditioning indoor unit and the hydraulic module, the output capacity of the compressor is accurately matched with the actual indoor heat exchange demands, and the indoor environment temperature regulation and the hydraulic module heat supply are effectively considered.

Further, in the above embodiment, the step S20 includes:

when the first energy demand information is that the heating capacity of at least one air-conditioning indoor unit demand is greater than a first preset value, namely when the air-conditioning indoor unit connected with the compressor needs energy or needs energy to be large, no matter whether the second energy demand information is that the heating capacity of at least one hydraulic module demand is greater than a second preset value or is less than or equal to the second preset value, the operation frequency of the compressor is regulated and controlled based on the temperature of the indoor heat exchangers of all the air-conditioning indoor units which are started currently or the temperature of the indoor heat exchangers of the air-conditioning indoor units of which the demand heating capacity is greater than the first preset value, and the heat output by the compressor is favorably ensured to simultaneously meet the temperature regulation demand of the space where the indoor unit with the capacity demand is located and the heat supply demand of the hydraulic module.

The temperature of the indoor heat exchanger can be determined according to temperature data detected by a temperature sensor arranged on the coil of the indoor heat exchanger, and can also be determined according to operation parameters (such as the discharge pressure and/or the discharge temperature of a compressor and the like) related to the temperature of the indoor heat exchanger in the outdoor unit.

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

When the first energy demand information is that the heating quantity required by at least one air conditioner indoor unit is smaller than or equal to a first preset value, and the second energy demand information is that the heating quantity required by at least one hydraulic module is larger than a second preset value, namely, the air conditioner indoor unit connected with the compressor does not need or needs to be smaller, and the hydraulic module connected with the compressor needs or needs to be larger, the running frequency of the compressor is regulated and controlled through the outlet water temperature of the hydraulic module, the requirement for regulating the indoor environment temperature can be met, meanwhile, the excessive heat output by the compressor is avoided, the phenomenon that the outlet water temperature of the hydraulic module frequently reaches the set water temperature to cause the compressor to frequently reach the temperature and stop is avoided, and the running stability of the compressor and the continuity of heat supply of the multi-split heat pump system are ensured.

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

Further, based on the above embodiments, another embodiment of the control method of the multi-online heat pump system of the present application is provided. In this embodiment, referring to fig. 4, when the first information indicates that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, the step of adjusting the operating frequency of the compressor according to the currently turned on temperature of the indoor heat exchanger of the air-conditioning indoor unit includes:

step S21, when the first energy-demand information is that the heating capacity demanded by the at least one air conditioner indoor unit is larger than a first preset value, determining a first frequency correction value according to the temperature of the indoor heat exchanger and the temperature of a preset heat exchanger;

the preset heat exchanger temperature is specifically a preset target value of the temperature required by the indoor heat exchanger of the air conditioner indoor unit in the heating process.

Different indoor heat exchanger temperatures and preset heat exchanger temperatures may correspond to different first frequency correction values. And pre-establishing a first corresponding relation among the indoor heat exchanger temperature, the preset heat exchanger temperature and the first frequency correction value, wherein the first corresponding relation can be a calculation relation, a mapping relation and the like. Based on the first corresponding relation, the current first frequency correction value can be obtained in the ways of table lookup, calculation and the like according to the temperature of the indoor heat exchanger and the temperature of the preset heat exchanger.

Specifically, in this embodiment, a first temperature difference value between the temperature of the indoor heat exchanger and the temperature of the preset heat exchanger is determined; when the first temperature difference value is larger than or equal to a first preset temperature difference, determining a first target correction value as the first frequency correction value; when the first temperature difference value is smaller than a second preset temperature difference value, determining a second target correction value as the first frequency correction value; the second preset temperature difference is smaller than or equal to the first preset temperature difference, the first target frequency corresponding to the first target correction value is larger than the initial frequency, and the first target frequency corresponding to the second target correction value is smaller than the initial frequency. In this embodiment, the first temperature difference value is a difference value (i.e., M-N) between a preset heat exchanger temperature M and an indoor heat exchanger temperature N, the first preset temperature difference value is greater than 0, and the second preset temperature difference value is less than 0. Based on the above, when the first temperature difference value is greater than or equal to the first preset temperature difference, the temperature of the preset heat exchanger is greater than the temperature of the indoor heat exchanger, and the deviation is large, at the moment, the initial frequency is increased through the first target correction value to obtain a first target frequency, so that the actual heat exchange temperature of the indoor unit of the air conditioner can be rapidly increased to the temperature of the preset heat exchanger; when the first temperature difference value is smaller than the second preset temperature difference value, the fact that the temperature of the preset heat exchanger is smaller than the temperature of the indoor heat exchanger and the deviation is large is shown, and at the moment, the initial frequency is reduced through the second target correction value to obtain the first target frequency.

Specifically, if X is defined as the preset heat exchanger temperature — the indoor heat exchanger temperature, the initial frequency of the compressor may be adjusted according to the following table:

first temperature difference value (. degree. C.)

X＜-3

-3≤X＜-2

-2≤X＜-1

-1≤X＜1

1≤X＜2

2≤X＜3

X≥3

Frequency correction value (Hz)

-5

-2

-1

0

+1

+2

+3

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

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

the initial frequency here may be a preset fixed frequency or may be 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 may represent both the frequency correction direction and the frequency correction amplitude, and the sum of the first frequency correction value and the initial frequency may be used as the first target frequency. In other embodiments, the first frequency correction value may only represent the frequency correction amplitude, and then after the frequency adjustment direction is determined according to the temperature of the indoor heat exchanger and the temperature of the preset heat exchanger, when the frequency adjustment direction is to reduce the initial frequency, the difference between the initial frequency and the first frequency correction value may 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 may be set as the first target frequency.

And step S23, controlling the compressor to operate at the first target frequency.

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

In this embodiment, when at least one air-conditioning indoor unit needs energy or needs energy to be large, the frequency of the compressor is regulated and controlled according to the above manner, so that the heat exchange temperature of the air-conditioning indoor unit can be maintained at the preset temperature of the heat exchanger, and the temperature regulation requirement of the indoor environment can be met.

Further, in this embodiment, before the step of adjusting the operating frequency of the compressor according to the temperature of the currently-started indoor heat exchanger of the indoor unit of the air conditioner, the temperature of the currently-started indoor heat exchanger of the indoor unit of the air conditioner may be obtained in one of the following two ways to be used for adjusting and controlling the frequency of the compressor:

the first method is as follows: when 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 exhaust pressure of the compressor; and determining the condensation temperature of the currently started indoor unit of the air conditioner according to the exhaust pressure, wherein the temperature of the indoor heat exchanger comprises the condensation temperature.

Specifically, a quantity relation between the exhaust pressure and the condensing temperature may be preset, and the condensing temperature of the currently opened indoor unit of the air conditioner is determined by calculating the exhaust pressure based on the quantity relation. Or, a mapping table of exhaust pressure and condensing temperature may be preset, and the condensing temperature of the currently-started indoor unit of the air conditioner may be obtained by querying the mapping table of the exhaust pressure.

It should be noted that the condensation temperature here represents a temperature value of a comprehensive condition of saturated temperatures of indoor heat exchangers of all currently turned on air-conditioning indoor units during condensation.

The second method comprises the following steps: when the first energy-demand information indicates that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, acquiring the rated heating capacity of the currently started air-conditioning indoor unit and the coil temperature of the corresponding indoor heat exchanger; determining the weight value of each currently started air conditioner indoor unit according to the rated heating capacity; and determining the temperature of the indoor heat exchanger according to the temperature of the coil pipe and the corresponding weight value of the coil pipe.

For example, n internal machines are currently required, rated heating amounts are n1, n2 and n3 … nx KW respectively, coil temperatures of the internal machines are T21, T22 and T23 … T2x ℃, and then temperatures of the indoor heat exchangers are determined

Further, in this embodiment, after step S10, the method further includes: when 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, acquiring the installation state information of a pressure sensor on the exhaust side of the compressor; if the installation state information indicates that the pressure sensor is not installed on the exhaust side of the compressor, acquiring the temperature of the indoor heat exchanger according to the first mode; if the installation state information indicates that the pressure sensor is installed on the exhaust side of the compressor, the temperature of the indoor heat exchanger can be obtained according to the second mode. The installation state information here may be determined by acquiring an instruction input by the user.

In the method, whether the pressure sensor is installed on the exhaust side of the compressor or not can be ensured, and the temperature of the indoor heat exchanger representing the heat exchange condition of the currently started indoor unit of the air conditioner can be effectively obtained.

Further, based on any one of the above embodiments, another embodiment of the control method of the multi-online heat pump system of the present application is provided. In this embodiment, referring to fig. 5, when the first energy-demand information indicates that the amount of heat required 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 indicates that the amount of heat 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, when the first energy and demand information indicates that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to a first preset value and the second energy and demand information indicates that the heating capacity required by the at least one hydraulic module is greater than a second preset value, determining a current first condensation temperature of the hydraulic module according to the outlet water temperature;

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

The different outlet water temperatures correspond to different first condensation temperatures. The second corresponding relation between the outlet water temperature and the first condensing temperature can be preset and can be a calculation formula, a mapping table and the like. Based on the second corresponding relation, the first condensation temperature can be calculated or obtained by inquiring the mapping table according to the water outlet temperature.

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

the target condensation temperature is specifically a target value of the temperature required by the preset hydraulic module in the heating process.

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

Specifically, in the present embodiment, a third temperature difference value between the target condensation temperature and the second condensation temperature is determined; when the third temperature difference value is greater than or equal to a third preset temperature difference, determining a third target correction value as the second frequency correction value; when the third temperature difference value is smaller than a fourth preset temperature difference value, determining a 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. In this embodiment, the third temperature difference value is a difference value (i.e., P-Q) between the preset heat exchanger temperature P and the indoor heat exchanger temperature Q, the third preset temperature difference value is greater than 0, and the fourth preset temperature difference value is less than 0. Based on the above, when the third temperature difference value is greater than or equal to the third preset temperature difference, the target condensation temperature is greater than the first condensation temperature, the deviation is large, at the moment, the initial frequency is increased through the third target correction value to obtain a second target frequency, and the actual heat exchange temperature of the hydraulic module is favorably and rapidly increased to the target condensation temperature; and when the third temperature difference value is smaller than the fourth preset temperature difference value, the target condensation temperature is smaller than the first condensation temperature, the deviation is large, and at the moment, the initial frequency is reduced through a fourth target correction value to obtain a second target frequency.

Specifically, if Y is defined as the target condensing temperature — the first condensing temperature, the initial frequency of the compressor may be adjusted according to the following table:

third temperature difference value (. degree. C.)

Y＜-3

-3≤Y＜-2

-2≤Y＜-1

-1≤Y＜1

1≤Y＜2

2≤Y＜3

Y≥3

Frequency correction value (Hz)

-5

-2

-1

0

+1

+2

+3

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

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

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 may represent both the frequency correction direction and the frequency correction amplitude, and the sum of the second frequency correction value and the initial frequency may be used as the second target frequency. In other embodiments, the second frequency correction value may only represent the frequency correction amplitude, and then after the frequency adjustment direction is determined according to the temperature of the indoor heat exchanger and the temperature of the preset heat exchanger, when the frequency adjustment direction is to reduce the initial frequency, the difference between the initial frequency and the second frequency correction value may 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 may be set as the second target frequency.

And step S204, controlling the compressor to operate at the second target frequency.

In this embodiment, when at least one air conditioner indoor set does not have can need or can need less and the water conservancy module has can need or can need great, regulate and control the compressor frequency according to above-mentioned mode, when can ensure that the temperature regulation demand of indoor environment satisfies, the compressor output capacity can with the heat phase-match of water conservancy module demand, avoid the temperature of water conservancy module too fast to reach and set for the temperature, prevent effectively that the compressor from frequently reaching the warm machine and shutting down.

Further, in this embodiment, the step of determining the current first condensation temperature of the hydro 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 is specifically a target value which is required to be reached by the preset outlet water temperature of the hydraulic module. The set water temperature may be a temperature set by a user or a temperature determined according to a target temperature to be reached by a target object heated by the water power module set by the user.

Specifically, the temperature correction value can be calculated through the outlet water temperature and the set water temperature. For example, the difference between the leaving water temperature and the set temperature may be used as the temperature correction value. And the temperature correction value can be obtained by inquiring a preset mapping table through the outlet water temperature and the set water temperature.

Specifically, in this embodiment, a second temperature difference value between the set water temperature and the outlet water temperature is determined; determining a temperature adjustment value according to the second temperature difference value; adjusting the set water temperature according to the temperature adjustment value to obtain the temperature correction value; the temperature adjusting value is in an increasing trend along with the increase of the second temperature difference value, and/or the temperature adjusting value is in a decreasing trend along with the decrease of the second temperature difference value. In this embodiment, the second temperature difference is a difference between the set water temperature and the outlet water temperature; in other embodiments, the second temperature difference value may also be an absolute value of a difference between the outlet water temperature and the set water temperature. The second temperature difference value can be directly used as a temperature adjustment value, and the temperature adjustment value can also be obtained through calculation or table lookup of the second temperature difference value based on the corresponding relation between the preset temperature difference and the adjustment value. In this embodiment, the variation trend of the outlet water temperature may be obtained, the corresponding relationship between the temperature difference and the adjustment value may be obtained based on the variation trend of the outlet water temperature, and different variation trends correspond to different corresponding relationships. And when the outlet water temperature is in the increasing trend, the temperature adjustment value corresponding to the second temperature difference value is determined based on the fourth corresponding relation, and when the outlet water temperature is in the decreasing trend, the temperature adjustment value corresponding to the second temperature difference value is determined based on the fifth corresponding relation. As shown in fig. 6, the temperature adjustment value corresponding to the outlet water temperature in the fourth corresponding relationship is greater than the temperature adjustment value corresponding to the outlet water temperature in the fifth corresponding relationship. In the present 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 of the set water temperature and the temperature adjustment value may be used as the temperature correction value.

Step S201b, correcting the preset condensing temperature according to the temperature correction value to obtain a reference condensing temperature;

the preset condensation temperature is specifically a preset temperature value, can be a preset fixed value, and can also be a temperature selected from a plurality of 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 may be used as the reference condensing temperature. In other embodiments, the difference, product or ratio of the preset condensing temperature and the temperature correction value may be used as the reference condensing temperature.

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

The obtained reference condensing temperature can be directly used as the first condensing temperature, a result obtained after correction according to a preset fixed correction value can be used as the first condensing temperature, the reference condensing temperature can be compared with a preset critical value of a preset temperature interval, and if the reference condensing temperature is in the preset temperature interval, the reference condensing temperature can be directly used as the first condensing temperature; if the reference condensing temperature is outside the preset temperature interval, the critical value of the preset temperature interval can be used as the first condensing temperature. The preset temperature interval may be a first temperature interval having a minimum critical value but not having a maximum critical value, a second temperature interval having a maximum critical value but not having a minimum critical value, or a third temperature interval having both a minimum critical value and a maximum critical value.

To better illustrate the determination of the first condensation temperature according to this embodiment, a specific application of this embodiment is provided below:

defining: the first condensation temperature is Tw _ cH, Tw-out is the outlet water temperature, Tw _ cH0 is the preset condensation temperature (default 45 ℃ and recommended value of 40-52 ℃), T1S is the set water temperature, k is the temperature correction value, C is the preset constant (default 45 ℃ and recommended value of 35-50 ℃), Δ TWS is the second temperature difference value, and Δ Trs is the intermediate parameter determined based on Δ TWS. Based on this, the first condensation temperature can be determined in combination with the following formula and fig. 6: formula (1), Tw _ cH ═ Tw _ cH0+ (T1S-C) + k; formula (2), k ═ Δ Trs-1, k ranges: -2. ltoreq. k.ltoreq.10.

Specifically, Δ Trs corresponding to Δ TWS is determined based on fig. 2, k is calculated by Δ Trs and formula (2), and the first condensation temperature is calculated by formula (1).

In this embodiment, the temperature correction value determined by combining the outlet water temperature of the hydraulic module and the set temperature corrects the preset condensing temperature to obtain the first condensing temperature, so that the obtained first condensing temperature can accurately represent the heat load condition of the current hydraulic module, the accuracy of the regulation and control of the frequency of the compressor based on the determined first condensing temperature is ensured, the output capacity of the compressor is matched with the actual heating requirement of the hydraulic module, and the compressor is effectively prevented from being frequently stopped due to temperature.

Further, in this embodiment, the process of determining the first condensing temperature according to the reference condensing temperature specifically includes: if the reference condensing temperature is within a preset temperature interval, determining the reference condensing temperature to be the first condensing temperature; if the reference condensing temperature is smaller than the minimum critical value of the preset temperature interval, determining the minimum critical value as the first condensing temperature; and if the reference condensing temperature is larger than the maximum critical value of the preset temperature interval, determining the maximum critical value as the first condensing temperature. The maximum critical value and the minimum critical value can be preset fixed temperature values or parameter values determined according to the current operation condition of the multi-split heat pump system. In this embodiment, the recommended minimum threshold value of the preset temperature range is 30 ℃ and is in the range of 25-35 ℃. The value of the first condensation temperature is limited through the preset temperature interval, so that the phenomenon that the running frequency of the compressor is too high or too low due to too high or too low of the first condensation temperature can be avoided, and the reliable and stable running of the compressor is ensured.

Further, in this embodiment, before the step of determining the first condensing temperature according to the reference condensing temperature, the method further includes: acquiring the outdoor environment temperature and the current running frequency of the compressor; determining the maximum critical value according to the outdoor environment temperature and the operation frequency. Different outdoor ambient temperatures and different operating frequencies correspond to different maximum thresholds. In this embodiment, the maximum critical value is obtained by querying a mapping table set in advance through the outdoor ambient temperature and the operating frequency. In other embodiments, the maximum threshold value may also be calculated by the outdoor ambient temperature and the operating frequency and a preset formula.

For example, the maximum threshold value may be found by querying the following table for outdoor ambient temperature T4 and compressor frequency F:

here, the maximum critical value of the first condensing temperature is determined by combining the outdoor environment temperature and the current operating frequency of the compressor, so that the first condensing temperature is limited based on the maximum critical value, and the reliability and stability of the operation of the compressor can be further improved when the operating frequency of the compressor is regulated according to the first condensing temperature.

Further, based on any of the above embodiments, a further embodiment of the control method of the multi-online heat pump system of the present application is provided. In this embodiment, referring to fig. 7, when the first energy-demand information indicates that the amount of heat required 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 indicates that the amount of heat 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, when the first energy-demand information is that the heating capacity required by the at least one air-conditioning indoor unit is less than or equal to a 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, determining a third target frequency according to a first target temperature difference, a second target temperature difference, the outlet water temperature and the set water temperature of the hydraulic module;

step S220, controlling the compressor to operate at the third target frequency.

The outlet water temperature here corresponds to the outlet water temperature at the corresponding time. The determination of the first actual condensing temperature and the second actual condensing temperature can be performed by analogy with the determination of the first condensing temperature, and will not be described herein again. The set condensing temperature here is specifically a target value to which the first condensing temperature set in advance is required to reach.

Based on the step S10, the step S210 and the step S220, when the first energy-demand information indicates that the amount of heat required 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 indicates that the amount of heat required by the at least one water power module is greater than the second preset value, the current third target frequency in the circulation process is determined by combining the temperature difference between the first actual condensation temperature and the set condensation temperature of the water power module and the temperature difference between the second actual condensation temperature and the set condensation temperature of the water power module in the last third target frequency.

Specifically, the preset corresponding relationship between the preset first target temperature difference, the preset second target temperature difference, the preset water temperature and the third target frequency can be preset. The preset corresponding relation can be a calculation formula, a mapping table and the like. And calculating and/or looking up a table to obtain the third target frequency based on the preset corresponding relation through the first target temperature difference, the second target temperature difference, the outlet water temperature and the set water temperature.

In this embodiment, a third temperature difference value between the first target temperature difference and the second target temperature difference is determined, and a fourth temperature difference value between the set water temperature and the outlet water temperature is determined; determining a target frequency adjustment value according to the third temperature difference value and the fourth temperature difference value; adjusting the current running frequency of the compressor according to the target frequency adjustment value to obtain a third target frequency; the third target frequency is increased along with the increase of the third temperature difference value, and the third target frequency is increased along with the increase of the fourth temperature difference value. In other words, the third target frequency tends to decrease with a decrease in the third temperature difference value, and the third target frequency tends to decrease with a decrease in the fourth temperature difference value.

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

For example, the results matched in the following table may be queried as the target frequency adjustment value Δ F by the third temperature difference value Δ T1 and the fourth temperature difference value Δ T2:

after Δ F is found through the above table query, the third target frequency is Fr + Δ F, where Fr is the current operating frequency of the compressor.

Further, based on any of the above embodiments, another embodiment of the control method for the multi-online heat pump system of the present application is provided. In this embodiment, referring to fig. 8, step S20, simultaneously with or after the execution, further includes:

step S30, adjusting the opening of a first electronic expansion valve of the indoor unit of the air conditioner to ensure that the temperature difference between the actual heat exchange temperature and the first target heat exchange temperature of the indoor unit of the air conditioner is smaller than a first set temperature difference; and/or adjusting the opening degree of a second electronic expansion valve of the hydraulic module so that the temperature difference between the actual heat exchange temperature of the hydraulic module and a second target heat exchange temperature is smaller than a second set temperature difference; and determining the first target heat exchange temperature and/or the second target heat exchange temperature according to the first energy-demand information and the second energy-demand information.

When the first information that the heating capacity required by the at least one air-conditioning indoor unit is greater than a first preset value, the first target heat exchange temperature is the temperature of the currently opened indoor heat exchanger of the air-conditioning indoor unit mentioned in the above embodiment; when the first energy requirement information indicates that the heating capacity required by the at least one air-conditioning indoor unit is less than or equal to the first preset value, and the second energy requirement information indicates that the heating capacity required by the at least one hydraulic module is greater than a second preset value, the second target heat exchange temperature 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 above embodiments, which are not described herein again.

The actual heat exchange temperature of the indoor unit of the air conditioner 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 a refrigerant flow path of the hydraulic module.

It should be noted that, when the number of the air-conditioning indoor units is more than one, the first electronic expansion valve of each air-conditioning indoor unit is independently regulated and controlled based on the actual heat exchange temperature, and the opening degree of the corresponding first electronic expansion valve is adjusted in different ways when the actual heat exchange temperature is different, 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 the hydraulic modules is more than one, the second electronic expansion valve of each hydraulic module is independently regulated and controlled based on the actual heat exchange temperature, and the opening degree of the corresponding second electronic expansion valve is adjusted in different modes when 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 the hydraulic modules are regulated and controlled according to the above manner, so that the refrigerant balance obtained by each indoor unit and each hydraulic module can be ensured, the indoor environment temperature regulation requirement is ensured, the heating requirement of the hydraulic modules is met at the same time, and the further improvement of the system energy efficiency is facilitated.

Specifically, the first electronic expansion valve can be regulated and controlled according to the following processes: acquiring a current first heat exchange temperature of the indoor unit of the air conditioner; determining a first opening degree adjusting value according to a first deviation value of the first heat exchange temperature and the first target heat exchange temperature; adjusting the opening degree of the first electronic expansion valve according to the first opening degree adjusting value; the first opening degree adjusting value is in an increasing trend along with the increase of the first deviation value. Specifically, the temperature of a coil of an indoor heat exchanger in an indoor unit of an air conditioner can be obtained as the first heat exchange temperature. Specifically, the first opening degree adjustment value may be determined according to a difference or a ratio between the first heat exchange temperature and the first target heat exchange temperature. When the first opening adjustment value is smaller than 0, reducing the opening of the first electronic expansion valve according to the first opening adjustment value; and when the first opening degree adjusting value is larger than 0, increasing the opening degree of the first electronic expansion valve according to the first opening degree adjusting value.

Specifically, the second electronic expansion valve can be regulated and controlled according to the following processes: acquiring a first temperature of a hydraulic module refrigerant inlet and a second temperature of the hydraulic module refrigerant outlet; determining a second heat exchange temperature of the hydro module according to the first temperature and the second temperature; determining a second opening degree adjusting value according to a second deviation value of the second heat exchange temperature and the second target heat exchange temperature; adjusting the opening degree of the second electronic expansion valve according to the second opening degree adjusting value; and the second opening degree adjusting value is in an increasing trend along with the increase of the second deviation value. In this embodiment, the average of the difference between the first temperature and the second temperature is taken as the second heat exchange temperature, and the equivalent coil temperature of the waterway in the hydro module is represented. 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 be directly used as the second heat exchange temperature. Specifically, the second opening degree adjustment value may be determined according to a difference or a ratio between the second heat exchange temperature and the second target heat exchange temperature. When the second opening adjustment value is smaller than 0, reducing the opening of the second electronic expansion valve according to the second opening adjustment value; and when the second opening adjustment value is larger than 0, increasing the opening of the second electronic expansion valve according to the second opening adjustment value.

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 preset period may be set at intervals, and a new first opening adjustment value and/or a new second opening adjustment value may be determined again to adjust the opening value of the corresponding 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 degree adjustment value may be determined according to the following mapping table:

as can be seen from the above table, when the first heat exchange temperature is lower than the first target heat exchange temperature and the temperature deviation of the two temperatures is greater than the threshold value 1, the corresponding first electronic expansion valve increases the opening degree to operate, and the opening degree adjustment amount tends to increase with the increase of the temperature deviation; when the first heat exchange temperature is higher than the first target heat exchange temperature and the temperature deviation amount of the two temperatures is higher than the threshold value 2, the corresponding first electronic expansion valve reduces the opening degree to operate, and the opening degree adjustment amount is in an increasing trend along with the increase of the temperature deviation amount. When the second heat exchange temperature is lower than the second target heat exchange temperature and the temperature deviation amount of the two temperatures is larger than the threshold value 3, the corresponding second electronic expansion valve increases the opening degree to operate, and the opening degree adjustment amount is in an increasing trend along with the increase of the temperature deviation amount; when the second heat exchange temperature is higher than the second target heat exchange temperature and the temperature deviation amount of the two temperatures is higher than the threshold value 4, the corresponding second electronic expansion valve reduces the opening degree to operate, and the opening degree adjustment amount is increased along with the temperature deviation amount.

Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a control program of an on-line heat pump system is stored on the computer-readable storage medium, and when the control program of the on-line heat pump system is executed by a processor, the relevant steps of any embodiment of the above method for controlling an on-line heat pump system are implemented.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, a multi-split heat pump system, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The control method of the multi-split heat pump system is characterized in that the multi-split heat pump system comprises a compressor, at least one hydraulic module and at least one air-conditioning indoor unit, wherein the at least one hydraulic module and the at least one air-conditioning indoor unit are both connected with the compressor, and the control method of the multi-split heat pump system comprises the following steps:

2. The method for controlling a multi-split heat pump system as claimed in 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:

3. The method for controlling a multi-online heat pump system according to claim 2, wherein when the first energy demand information indicates that the amount of heat required by the at least one air conditioning indoor unit is greater than a first preset value, the step of adjusting the operating frequency of the compressor according to the currently turned on temperature of the indoor heat exchanger of the air conditioning indoor unit comprises:

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

controlling the compressor to operate at the first target frequency.

4. The method for controlling a multi-split heat pump system as claimed in claim 3, wherein the step of determining the first frequency correction value based on the indoor heat exchanger temperature and a preset heat exchanger temperature comprises:

5. The method for controlling a multi-split heat pump system as claimed in claim 2, wherein the step of adjusting the operating frequency of the compressor according to the temperature of the currently turned on indoor heat exchanger of the indoor unit of the air conditioner further comprises:

6. The method for controlling a multi-online heat pump system according to claim 5, wherein the step of acquiring the first energy requirement information of the at least one air conditioning indoor unit and the second energy requirement information of the at least one hydraulic module is followed by the step of:

7. The method for controlling a multi-online heat pump system according to claim 2, wherein when the first energy requirement information indicates that the amount of heat required by the at least one air conditioning indoor unit is less than or equal to the first preset value, and the second energy requirement information indicates that the amount of heat 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 comprises:

when the first energy demand information indicates that the heating capacity required by the at least one air conditioner indoor unit is less than or equal to a first preset value, and the second energy demand information indicates that the heating capacity required by the at least one hydraulic module is greater than a second preset value, determining a current first condensation temperature of the hydraulic module according to the outlet water temperature;

controlling the compressor to operate at the second target frequency.

8. The method for controlling a multi-online heat pump system according to claim 7, wherein the step of determining the current first condensation temperature of the hydro modules according to the outlet water temperature comprises:

9. The method for controlling a multi-split heat pump system as claimed in claim 8, wherein the step of determining the temperature correction value according to the outlet water temperature and the set water temperature of the hydro module comprises:

10. The method for controlling a multi-on-line heat pump system as claimed in claim 8, wherein the step of determining the first condensing temperature based on the reference condensing temperature comprises:

11. The method for controlling a multi-split heat pump system as claimed in claim 10, wherein the step of determining the first condensing temperature based on the reference condensing temperature is preceded by the step of:

12. The method for controlling a multi-split heat pump system as claimed in claim 7, wherein the step of determining the second frequency correction value based on the first condensing temperature and the target condensing temperature comprises:

13. The method for controlling a multi-online heat pump system according to claim 2, wherein when the first energy requirement information indicates that the amount of heat required by the at least one air conditioning indoor unit is less than or equal to the first preset value, and the second energy requirement information indicates that the amount of heat 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 comprises:

when the first energy-demand information indicates that the heating capacity required by the at least one air-conditioning indoor unit is less than or equal to a first preset value and the second energy-demand information indicates that the heating capacity required by the at least one hydraulic module is greater than a second preset value, determining a third target frequency according to a first target temperature difference, a 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;

14. The method for controlling a multi-online heat pump system as claimed in claim 13, wherein the step of determining a third target frequency based on the first target temperature difference, the second target temperature difference, the leaving water temperature, and the set water temperature of the hydro module comprises:

15. The method for controlling a multi-split heat pump system as claimed in any one of claims 1 to 14, wherein, simultaneously with 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 is performed, the method further comprises:

16. The method for controlling a multi-split heat pump system as claimed in 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:

17. The method for controlling a multi-online heat pump system as claimed in claim 15, wherein the step of adjusting the opening degree of the second electronic expansion valve of the hydro module comprises:

18. A multi-split heat pump system, comprising:

a compressor;

at least one hydro module;

the at least one hydraulic module and the at least one air-conditioning indoor unit are connected with the compressor; and

the compressor, the at least one water conservancy module and the at least one air conditioning indoor set all with controlling means connects, controlling means includes: a memory, a processor and a control program of an on-line heat pump system stored on the memory and operable on the processor, the control program of the on-line heat pump system, when executed by the processor, implementing the steps of the method of controlling an on-line heat pump system as claimed in any one of claims 1 to 17.

19. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a control program of an on-line heat pump system, which when executed by a processor implements the steps of the method of controlling an on-line heat pump system according to any one of claims 1 to 17.