Control method of heat pump system, heat pump system and storage medium

Abstract

The invention discloses a control method of a heat pump system, the heat pump system and a storage medium. The heat pump system comprises a refrigerant circulation loop, the refrigerant circulation loop comprises a compressor and an energy storage device, the energy storage device is used for storing energy flowing through a refrigerant, and the method comprises the steps that the first condensation temperature of the heat pump system and the first temperature of the energy storage device are obtained; frequency control parameters of the compressor are determined according to the first condensation temperature and the first temperature of the energy storage device; and the compressor is controlled to operate according to the frequency control parameters. The invention aims to improve the energy efficiency of the heat pump system provided with the energy storage device.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a control method for a heat pump system, a heat pump system and a storage medium. Background Art

[0002] In addition to regulating the temperature of air, the heat pump system can also be used to regulate the temperature of objects such as water. The energy storage device in the refrigerant flow path of the heat pump system is loaded with water and other media that need to be temperature regulated. The refrigerant flowing through the medium in the energy storage device can absorb the energy of the refrigerant and store it.

[0003] Among them, the operating frequency of the compressor of the heat pump system equipped with an energy storage device is generally regulated according to the temperature of the energy storage device and the ambient temperature. However, the ambient temperature state is generally relatively stable. With this regulation method, the frequency adjustability of the compressor is poor, and the system is prone to poor energy efficiency. Summary of the invention

[0004] The main purpose of the present invention is to provide a control method of a heat pump system, a heat pump system and a storage medium, aiming to improve the energy efficiency of a heat pump system provided with an energy storage device.

[0005] To achieve the above object, the present invention provides a control method for a heat pump system, wherein the heat pump system comprises a refrigerant circulation loop, wherein the refrigerant circulation loop comprises a compressor and an energy storage device, wherein the energy storage device is used to store energy flowing through the refrigerant, and wherein the control method for the heat pump system comprises the following steps:

[0006] Acquiring a first condensing temperature of the heat pump system and a first temperature of the energy storage device;

[0007] determining a frequency control parameter of the compressor according to the first condensing temperature and a first temperature of the energy storage device;

[0008] The operation of the compressor is controlled according to the frequency control parameter.

[0009] Optionally, the step of determining the frequency control parameter of the compressor according to the first condensing temperature and the first temperature of the energy storage device includes:

[0010] determining a first temperature difference between the first condensation temperature and the first temperature;

[0011] The frequency control parameter is determined according to the relationship between the first temperature difference value and a preset temperature difference range.

[0012] Optionally, the refrigerant main circuit further includes an outdoor heat exchanger connected to the compressor, and the step of determining the frequency control parameter according to the relationship between the first temperature difference value and the preset temperature difference range includes:

[0013] When the first temperature difference value is greater than an upper limit value of a preset temperature difference interval, determining the frequency control parameter includes reducing the compressor frequency;

[0014] When the first temperature difference value is less than the lower limit value of the preset temperature difference interval, determining the frequency control parameter includes increasing the compressor frequency;

[0015] When the first temperature difference value is within the preset temperature difference range, the frequency control parameter is determined according to the second temperature of the outdoor heat exchanger and the ambient temperature corresponding to the heat pump system.

[0016] Optionally, the step of determining the frequency control parameter according to the second temperature of the outdoor heat exchanger and the ambient temperature corresponding to the heat pump system includes:

[0017] determining a second temperature difference between the ambient temperature and the second temperature;

[0018] When the second temperature difference value is less than a preset temperature difference, determining the frequency control parameter includes increasing the compressor frequency;

[0019] When the second temperature difference is greater than or equal to a preset temperature difference, determining the frequency control parameter includes maintaining the compressor frequency unchanged.

[0020] Optionally, after the step of obtaining the first condensing temperature of the heat pump system and the first temperature of the energy storage device, the method further includes:

[0021] When the first condensing temperature is greater than or equal to a preset protection temperature, determining the frequency control parameter includes reducing the compressor frequency;

[0022] When the first condensing temperature is lower than the preset protection temperature, the step of determining the frequency control parameter of the compressor according to the first condensing temperature and the first temperature of the energy storage device is performed.

[0023] Optionally, the refrigerant main circuit further includes an outdoor heat exchanger connected to the compressor, and the step of controlling the operation of the compressor according to the frequency control parameter includes:

[0024] When the frequency control parameter includes increasing the compressor frequency or decreasing the compressor frequency, determining a frequency adjustment value according to the first condensing temperature, the first temperature, the second temperature of the outdoor heat exchanger, and the ambient temperature corresponding to the heat pump system;

[0025] The compressor is controlled to adjust the frequency according to the frequency adjustment value and the frequency control parameter.

[0026] Optionally, the control method of the heat pump system further includes:

[0027] Obtaining an operating mode of the heat pump system;

[0028] When the operation mode is the first mode, performing the step of obtaining the first condensing temperature of the heat pump system and the first temperature of the energy storage device;

[0029] When the operation mode is the second mode, obtaining a second condensing temperature of the heat pump system, and controlling the operation frequency of the compressor according to the second condensing temperature and a preset protection temperature;

[0030] The energy efficiency value of the heat pump system corresponding to the first mode is greater than a preset energy efficiency value, and the energy storage rate of the energy storage device corresponding to the second mode is greater than a preset rate.

[0031] Optionally, the step of controlling the operating frequency of the compressor according to the second condensing temperature and the preset protection temperature includes:

[0032] When the second condensing temperature is greater than or equal to a preset protection temperature, controlling the compressor to operate at a reduced frequency;

[0033] When the second condensing temperature is lower than the preset protection temperature, and the temperature difference between the preset protection temperature and the second condensing temperature is greater than a preset value, controlling the compressor to increase the frequency of operation;

[0034] When the second condensing temperature is lower than the preset protection temperature, and the temperature difference between the preset protection temperature and the second condensing temperature is lower than or equal to a preset value, the compressor is controlled to maintain the current frequency operation.

[0035] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a heat pump system, the heat pump system includes a control device and a refrigerant circulation loop, the refrigerant circulation loop includes a compressor and an energy storage device, and the energy storage device is used to store energy flowing through the refrigerant;

[0036] The compressor is connected to the control device, which includes: a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, the steps of the control method for the heat pump system as described in any one of the above items are implemented.

[0037] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of a heat pump system is stored. When the control program of the heat pump system is executed by a processor, the steps of the control method of the heat pump system as described in any of the above items are implemented.

[0038] The present invention proposes a control method for a heat pump system, in which a refrigerant circulation loop of the heat pump system includes an energy storage device that can be used by a compressor to store energy of the refrigerant flowing through it. In this method, the temperature of the energy storage device can accurately reflect the energy storage demand of the energy storage device, and the condensation temperature can accurately reflect the output capacity of the system. The combination of the condensation temperature and the temperature of the energy storage device can reflect the energy efficiency of the heat pump system in the current environment in real time and accurately. Therefore, the operating frequency of the compressor is regulated according to the condensation temperature and the temperature of the energy storage device, which can ensure that the energy efficiency of the heat pump system provided with the energy storage device is effectively improved under the frequency regulation of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of an embodiment of a heat pump system of the present invention;

[0040] Figure 2 It is a structural schematic diagram of another embodiment of the heat pump system of the present invention;

[0041] Figure 3 A schematic diagram of the hardware structure involved in the operation of an embodiment of a heat pump system of the present invention;

[0042] Figure 4 A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0043] Figure 5 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0044] Figure 6 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0045] Figure 7 This is a flow chart of another embodiment of a control method for a heat pump system of the present invention.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0048] An embodiment of the present invention provides a heat pump system.

[0049] In the embodiment of the present invention, refer to Figure 1 and Figure 3 The heat pump system includes a control device 100 and a refrigerant circulation circuit, and the refrigerant circulation circuit includes a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit.

[0050] The refrigerant main circuit includes a first heat exchanger 9, a first control valve 7, a second heat exchanger 4 and a compressor 1. The first heat exchanger 9, the first control valve 7 and the second heat exchanger 4 are connected in sequence. The first heat exchanger 9 and the second heat exchanger 4 are respectively connected to the compressor 1. The refrigerant branch circuit includes an energy storage device 10 and a second control valve 6. The energy storage device 10 is used to store energy flowing through the refrigerant, and the heat dissipation module 5 is used to dissipate heat from heat-generating components (such as a main control board, etc.).

[0051] The first control valve 7 and the second control valve 6 are both connected to the control device 100. In this embodiment, the first control valve 7 and the second control valve 6 are both electronic expansion valves. In other embodiments, the first control valve 7 and / or the second control valve 6 may also be other types of flow-adjustable fluid components.

[0052] The first end of the refrigerant branch is connected to the exhaust port of the compressor 1 on the refrigerant main circuit or the return port of the compressor 1. In the present embodiment, the first end of the refrigerant branch is connected to the exhaust port of the compressor 1 on the refrigerant main circuit, and the pipeline between the first heat exchanger 9 and the second heat exchanger 4 is connected to the second end of the refrigerant branch. In the present embodiment, the pipeline between the first control valve 7 and the second heat exchanger 4 is connected to the second end of the refrigerant branch. Based on this, the heat of the high-temperature refrigerant discharged by the compressor 1 when the second control valve 6 is opened can be stored in the energy storage device 10. In other embodiments, the first end of the refrigerant branch is connected to the return port of the compressor on the refrigerant main circuit, and the coldness of the low-temperature refrigerant that flows back to the compressor 1 when the second control valve 6 is opened can be stored in the energy storage device 10.

[0053] The energy storage device 10 is loaded with energy storage materials. When the refrigerant in the refrigerant branch flows through the energy storage device 10, the energy storage materials absorb the heat or cold of the refrigerant and store it. In this embodiment, the energy storage device 10 is a water tank. In other embodiments, the energy storage device 10 may also be other types of devices made of energy storage materials with energy storage functions, such as a device loaded with molten salt.

[0054] A second fan is provided corresponding to the second heat exchanger 4, and the second fan can drive air to exchange heat with the second heat exchanger 4. A first fan is provided corresponding to the first heat exchanger 9, and the first fan can drive air to exchange heat with the first heat exchanger 9. Both the first fan and the second fan are connected to the control device 100.

[0055] In this embodiment, the number of the first heat exchanger 9 and the corresponding first control valve 7 may be more than one, and the more than one first heat exchanger 9 and the corresponding first control valve 7 are distributed in different indoor spaces. Each first heat exchanger 9 is connected in series with the corresponding first control valve 7, and the more than one first heat exchanger 9 is connected in parallel.

[0056] In this embodiment, the first heat exchanger 9 is arranged indoors, and the second heat exchanger 4 is arranged outdoors. In other embodiments, the first heat exchanger 9 is arranged outdoors, and the second heat exchanger 4 is arranged indoors.

[0057] In this embodiment, the refrigerant main circuit also includes a reversing component connected to the control device 100, and the return air port of the compressor 1, the exhaust port of the compressor 1, the first heat exchanger 9 and the second heat exchanger 4 are all connected to the reversing component.

[0058] In one implementation of the present embodiment, the reversing assembly includes a first four-way valve 2 and a second four-way valve 3, the exhaust port of the compressor 1, the first heat exchanger 9, the return air port of the compressor 1 and the first blocking member are respectively connected to different valve ports of the first four-way valve 2, and the exhaust port of the compressor 1, the return air port of the compressor 1, the second heat exchanger 4 and the second blocking member are respectively connected to different valve ports of the second four-way valve 3.

[0059] The first four-way valve 2 has a first valve position and a second valve position. In the first valve position, the return air port is connected to the first heat exchanger 9 and the exhaust port is connected to the first blocking member. In the second valve position, the exhaust port is connected to the first heat exchanger 9 and the return air port is connected to the first blocking member.

[0060] The second four-way valve 3 has a third valve position and a fourth valve position. In the third valve position, the return air port is connected to the second heat exchanger 4 and the exhaust port is connected to the second blocking member. In the fourth valve position, the exhaust port is connected to the second heat exchanger 4 and the return air port is connected to the second blocking member.

[0061] The heat pump system can switch between a variety of different modes through the cooperation of the first four-way valve 2 and the second four-way valve 3. No matter how the operation mode of the heat pump system is switched, when the second control valve 6 is opened, the refrigerant in the refrigerant main circuit can flow into the refrigerant branch circuit and store energy in the energy storage device 10.

[0062] In other embodiments, the heat pump system may not include a reversing component, and the exhaust port of the compressor 1, the first heat exchanger 9, the first control valve 7, the second heat exchanger 4, and the return air port of the compressor 1 in the main refrigerant circuit are connected in sequence; or, the exhaust port of the compressor 1, the second heat exchanger 4, the first control valve 7, the first heat exchanger 9, and the return air port of the compressor 1 are connected in sequence.

[0063] Further, in another embodiment, referring to Figure 2 and Figure 3 The refrigerant circulation loop includes a compressor 1, a first heat exchanger 101, a throttling device 102, a second heat exchanger 103 and a reversing member 104, and the second heat exchanger 103 is connected to the energy storage device 10 for heat exchange. The first heat exchanger 101, the throttling device 102, and the second heat exchanger 103 are connected in sequence, and the exhaust port of the compressor 1, the return air port of the compressor 1, the first heat exchanger 101, and the second heat exchanger 103 are connected to the reversing member 104 respectively.

[0064] In this embodiment, the first heat exchanger 101 is arranged outdoors, and the second heat exchanger 103 is arranged indoors.

[0065] In this embodiment, the reversing member includes a four-way valve. In other embodiments, the reversing member may also include a combination of other types of multi-way valves and / or one-way valves with reversing functions. Based on the change in the operating state of the reversing member 104, the energy storage device 10 may have two different energy storage states:

[0066] When the reversing element 104 operates in the first operating state, the exhaust port of the compressor 1 is connected to the second heat exchanger 103, and the return port of the compressor 1 is connected to the first heat exchanger 101. The refrigerant discharged from the compressor 1 flows through the second heat exchanger 103, the throttling device 102, and the first heat exchanger 101 in sequence and then flows back to the compressor 1. Among them, the second heat exchanger 103 is in a condensing state, and the heat released by the refrigerant flowing through is stored in the energy storage material loaded by the energy storage device 10, and the energy storage device 10 is in a heating state.

[0067] When the reversing member 104 operates in the second operating state, the exhaust port of the compressor 1 is connected to the first heat exchanger 101, and the return port of the compressor 1 is connected to the second heat exchanger 103. The refrigerant discharged from the compressor 1 flows through the first heat exchanger 101, the throttling device 102, and the second heat exchanger 103 in sequence before flowing back to the compressor 1. Among them, the second heat exchanger 103 is in an evaporating state, and the cold released by the refrigerant flowing through is stored in the energy storage material loaded in the energy storage device 10, and the energy storage device 10 is in a cooling state.

[0068] Further, see Figures 1 to 3 The heat pump system further includes a pressure sensor 01 and a second temperature sensor 02, both of which are connected to the control device 100. The pressure sensor 01 is arranged on the exhaust side of the compressor 1, and is used to detect the condensing pressure of the heat pump system, and calculate the condensing temperature by the detected condensing pressure. The second temperature sensor 02 is arranged in the energy storage device 10 to detect the temperature of the energy storage device 10.

[0069] Further, see Figures 1 to 3 The heat pump system further includes a third temperature sensor 03, which is connected to the control device 100. The third temperature sensor 03 is disposed on a coil of the outdoor heat exchanger of the first heat exchanger 101 and the second heat exchanger 103 to detect the outdoor heat exchanger temperature.

[0070] Further, see Figures 1 to 3The heat pump system further includes a fourth temperature sensor 04, which is connected to the control device 100 and is disposed in the environment where the heat pump system is located to detect the ambient temperature. In this embodiment, the fourth temperature sensor 04 is disposed in the outdoor environment to detect the outdoor ambient temperature.

[0071] In the embodiment of the present invention, refer to Figure 3 The control device 100 of the heat pump system includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0072] Those skilled in the art will understand that Figure 3 The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0073] like Figure 3 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0074] exist Figure 3 In the device shown, the processor 1001 can be used to call the control program of the heat pump system stored in the memory 1002, and execute the relevant step operations of the control method of the heat pump system in the following embodiment.

[0075] An embodiment of the present invention further provides a control method for a heat pump system, which is applied to the above-mentioned heat pump system.

[0076] Reference Figure 4 , an embodiment of a control method of a heat pump system of the present application is proposed. In this embodiment, the control method of the heat pump system includes:

[0077] Step S10, obtaining a first condensing temperature of the heat pump system and a first temperature of the energy storage device;

[0078] The high pressure detected by the pressure sensor is obtained, and the saturation temperature corresponding to the high pressure is determined as the first condensing temperature. In other embodiments, a temperature sensing package may be directly provided on the exhaust side of the compressor, and the first condensing temperature may be determined based on the temperature data detected by the temperature sensing package.

[0079] The temperature data detected by the second temperature sensor is acquired, and the first temperature is determined according to the detected temperature data.

[0080] Step S20, determining a frequency control parameter of the compressor according to the first condensing temperature and a first temperature of the energy storage device;

[0081] The frequency control parameters include frequency adjustment parameters (increasing frequency or decreasing frequency or maintaining frequency unchanged or frequency adjustment value or frequency adjustment rate, etc.) or the target frequency required for the compressor to operate or the maximum frequency allowed for the compressor to operate or the minimum frequency allowed for the compressor to operate, etc.

[0082] Different first condensing temperatures and different first temperatures correspond to different frequency control parameters. Specifically, a correspondence between the condensing temperature of the heat pump system, the temperature of the energy storage device and the frequency control parameter can be established in advance. The correspondence can include a calculation formula, a mapping relationship, etc. Based on the correspondence, the frequency control parameter corresponding to the current first condensing temperature and the first temperature can be determined.

[0083] Specifically, the temperature difference between the first condensing temperature and the first temperature may be determined, and the frequency control parameter may be determined according to the temperature difference. Alternatively, the first temperature difference between the first condensing temperature and the first temperature may be determined, the second temperature difference between the first condensing temperature and the preset protection temperature may be determined, and the frequency control parameter may be determined according to the first temperature difference and the second temperature difference. Alternatively, the first frequency control parameter may be determined according to the first condensing temperature, the second frequency control parameter may be determined according to the first temperature, and the frequency control parameter here may be determined according to the first frequency control parameter and the second frequency control parameter.

[0084] Step S30, controlling the operation of the compressor according to the frequency control parameter.

[0085] When the frequency control parameters include increasing the compressor frequency, the compressor is controlled to increase the operating frequency; when the frequency control parameters include reducing the compressor frequency, the compressor is controlled to reduce the operating frequency; when the frequency control parameters include maintaining the compressor frequency unchanged, the compressor is controlled to maintain the current frequency; when the frequency control parameters include a target frequency, the compressor is controlled to operate at the target frequency; when the frequency control parameters include the maximum frequency at which the compressor is allowed to operate, the compressor is controlled to operate at a frequency less than or equal to the maximum frequency; when the frequency control parameters include the minimum frequency at which the compressor is allowed to operate, the compressor is controlled to operate at a frequency greater than or equal to the minimum frequency.

[0086] A control method for a heat pump system is proposed in an embodiment of the present invention. The refrigerant circulation loop of the heat pump system includes an energy storage device that can be used by a compressor to store energy of the refrigerant flowing through it. In this method, the temperature of the energy storage device can accurately reflect the energy storage demand of the energy storage device, and the condensing temperature can accurately reflect the output capacity of the system. The combination of the condensing temperature and the temperature of the energy storage device can reflect the energy efficiency of the heat pump system in the current environment in real time and accurately. Therefore, the operating frequency of the compressor is regulated according to the condensing temperature and the temperature of the energy storage device, which can ensure that the energy efficiency of the heat pump system provided with the energy storage device is effectively improved under the frequency regulation of the compressor.

[0087] Further, based on the above embodiment, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, referring to Figure 5 , the step S20 comprises:

[0088] Step S21, determining a first temperature difference between the first condensation temperature and the first temperature;

[0089] The first temperature difference value is specifically a calculation result obtained by subtracting the first temperature from the first condensation temperature.

[0090] Step S22, determining the frequency control parameter according to the relationship between the first temperature difference value and a preset temperature difference range.

[0091] The preset temperature difference interval is specifically the target value interval that the temperature difference between the first condensing temperature and the first temperature needs to reach when the heat pump system reaches a better target energy efficiency state. The preset temperature difference interval can be a pre-set fixed interval, or an interval obtained according to the current operating state of the heat pump system. For example, the temperature difference between the first temperature and the target energy storage temperature of the energy storage device can be obtained, and the preset temperature difference interval here can be determined according to the temperature difference value, and / or the outdoor fan speed can be obtained, and the preset temperature difference interval here can be determined according to the outdoor fan speed, and so on.

[0092] In this embodiment, the preset temperature difference interval is [5° C., 10° C.] In other embodiments, the critical value of the preset temperature difference interval can also be set to other values ​​according to actual conditions.

[0093] Specifically, the frequency control parameter here is determined according to the size relationship or quantity relationship between the first temperature difference value and the critical value of the preset temperature difference interval.

[0094] In this embodiment, the frequency control parameter includes the frequency adjustment direction (eg, increasing the frequency, decreasing the frequency, or maintaining the frequency unchanged). In other embodiments, the frequency control parameter may include the frequency adjustment amplitude in addition to the frequency adjustment direction, and so on.

[0095] In this embodiment, the first temperature difference value can accurately reflect the heat exchange efficiency during the energy storage process of the heat pump system. Therefore, the frequency control parameters are determined based on the relationship between the first temperature difference value and the preset temperature difference range, which is beneficial to improving the accuracy of the compressor operating frequency regulation and ensuring that under the regulation of the frequency control parameters, the energy efficiency of the heat pump system can be effectively improved and reach a predetermined optimal energy efficiency state.

[0096] Furthermore, in this embodiment, the refrigerant main circuit also includes an outdoor heat exchanger connected to the compressor. When the first temperature difference value is greater than the upper limit value of the preset temperature difference range, determining the frequency control parameter includes lowering the compressor frequency; when the first temperature difference value is less than the lower limit value of the preset temperature difference range, determining the frequency control parameter includes increasing the compressor frequency; when the first temperature difference value is within the preset temperature difference range, the frequency control parameter is determined according to the second temperature of the outdoor heat exchanger and the ambient temperature corresponding to the heat pump system.

[0097] In this embodiment, the ambient temperature includes the outdoor ambient temperature. In other embodiments, the ambient temperature may also include the indoor ambient temperature.

[0098] In this embodiment, when the first temperature difference value is too high or too low compared to the preset temperature difference interval, it indicates that the current energy efficiency of the heat pump system is not good. When the first temperature difference value is too large, reducing the compressor frequency is beneficial to the condensation temperature, so that the temperature difference between the first condensation temperature and the first temperature is reduced and changes toward the preset temperature difference interval, thereby effectively improving the energy efficiency of the heat pump system; when the first temperature difference value is too small, increasing the compressor frequency is beneficial to the condensation temperature, so that the temperature difference between the first condensation temperature and the first temperature is increased and changes toward the preset temperature difference interval, thereby effectively improving the energy efficiency of the heat pump system. When the first temperature difference value is within the preset temperature difference interval, it indicates that the energy efficiency of the heat pump system is better. At this time, further combining the outdoor heat exchanger temperature and the ambient temperature to determine the frequency control parameters is beneficial to improving the heat exchange efficiency of the outdoor heat exchanger, thereby further improving the energy efficiency of the heat pump system.

[0099] In other embodiments, when the first temperature difference value is within the preset temperature difference range, it may also be determined that maintaining the compressor frequency unchanged is the frequency control parameter.

[0100] Furthermore, in this embodiment, after step S10, it also includes: when the first condensing temperature is greater than or equal to the preset protection temperature, determining the frequency control parameter includes reducing the compressor frequency; when the first condensing temperature is lower than the preset protection temperature, executing the step of determining the frequency control parameter of the compressor according to the first condensing temperature and the first temperature of the energy storage device.

[0101] The preset protection temperature is specifically the maximum condensing temperature allowed for reliable operation of the heat pump system. The preset protection temperature may be a preset fixed temperature or a temperature determined according to the actual operating conditions of the heat pump system, for example, the preset protection temperature here is determined according to the ambient temperature.

[0102] Furthermore, when the first condensing temperature is greater than or equal to the preset protection temperature, the frequency adjustment value of the compressor can also be determined according to the temperature difference between the first condensing temperature and the preset protection temperature, and determining the control parameters includes reducing the compressor frequency and the frequency adjustment value.

[0103] In this embodiment, when the first condensing temperature is greater than or equal to the preset protection temperature, it indicates that the heat pump system is not reliable enough and is prone to damage. At this time, the condensing temperature is reduced by reducing the frequency of the compressor, thereby avoiding damage to the system due to excessively high condensing temperature, so as to effectively improve the reliability of the heat pump system. When the first condensing temperature is less than the preset protection temperature, indicating that the system is in a reliable operating state, the frequency of the compressor is further adjusted in the manner mentioned in the above embodiment, thereby ensuring the reliable operation of the system and effectively improving the energy efficiency of the heat pump system.

[0104] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. Figure 6 The step of determining the frequency control parameter according to the second temperature of the outdoor heat exchanger and the ambient temperature corresponding to the heat pump system comprises:

[0105] Step S221, determining a second temperature difference between the ambient temperature and the second temperature;

[0106] In this embodiment, a calculation result obtained by subtracting the second temperature from the ambient temperature is used as the second temperature difference value.

[0107] Step S222, when the second temperature difference is less than a preset temperature difference, determining the frequency control parameter includes increasing the compressor frequency;

[0108] The preset temperature difference is specifically a critical temperature difference between the ambient temperature and the outdoor heat exchanger temperature for distinguishing whether the energy efficiency of the heat pump system reaches the optimal energy efficiency.

[0109] The preset temperature difference may be a preset fixed value or a value obtained according to the actual operating state of the heat pump system. For example, the preset temperature difference may be determined according to the first temperature difference value and / or the outdoor fan speed and / or the difference between the first temperature difference value and the upper limit value of the preset temperature difference interval and / or the difference between the first temperature difference value and the lower limit value of the preset temperature difference interval.

[0110] Furthermore, the frequency adjustment amplitude may be determined according to the difference between the second temperature difference value and the preset temperature difference, and determining the frequency control parameter includes increasing the compressor frequency and the frequency adjustment amplitude.

[0111] Step S223: when the second temperature difference is greater than or equal to a preset temperature difference, determining the frequency control parameter includes maintaining the compressor frequency unchanged.

[0112] In this embodiment, when the second temperature difference is less than the preset temperature difference, it indicates that the heat exchange efficiency of the outdoor heat exchanger is poor, and the energy efficiency of the heat pump system has not reached the optimal energy efficiency. At this time, by increasing the compressor frequency, it is beneficial to further increase the temperature difference between the ambient temperature and the second temperature, so that the outdoor heat exchanger can absorb more air energy, improve the heat exchange efficiency of the outdoor heat exchanger, and thus improve the energy efficiency of the heat pump system. When the second temperature difference is greater than or equal to the preset temperature difference, it indicates that the heat exchange efficiency of the outdoor heat exchanger is better, and the energy efficiency of the heat pump system has reached the optimal energy efficiency. At this time, the compressor maintains the current frequency, which can keep the heat pump system in the optimal energy efficiency state.

[0113] In other embodiments, the target frequency of the compressor is calculated by substituting the ambient temperature and the second temperature into a preset formula.

[0114] Further, based on any of the above embodiments, the refrigerant main circuit also includes an outdoor heat exchanger connected to the compressor, and step S30 includes: when the frequency control parameter includes increasing the compressor frequency or decreasing the compressor frequency, determining the frequency adjustment value according to the first condensing temperature, the first temperature, the second temperature of the outdoor heat exchanger and the ambient temperature corresponding to the heat pump system; controlling the compressor adjustment frequency according to the frequency adjustment value and the frequency control parameter.

[0115] In one implementation of this embodiment, the frequency adjustment value here can be determined based on a first temperature difference between the first condensing temperature and the first temperature and a second temperature difference between the ambient temperature and the second temperature of the outdoor heat exchanger, and different first temperature difference values ​​and different second temperature difference values ​​correspond to different frequency adjustment values.

[0116] In another implementation of this embodiment, in addition to the first temperature difference value and the second temperature difference value, a third temperature difference value between the first temperature and the ambient temperature can also be determined, and the frequency adjustment value is determined according to the first temperature difference value, the second temperature difference value and the third temperature difference value, and different first temperature difference values, different second temperature difference values ​​and different third temperature difference values ​​correspond to different frequency adjustment values.

[0117] Among them, when the frequency control parameter includes increasing the compressor frequency, the compressor can be controlled to increase the frequency according to the frequency adjustment value; when the frequency control parameter includes reducing the compressor frequency, the compressor can be controlled to reduce the frequency according to the frequency adjustment value.

[0118] In this embodiment, the frequency adjustment value is determined in combination with the first condensing temperature, the first temperature, the second temperature and the ambient temperature, which is beneficial to further improve the accuracy of the compressor frequency regulation, so that the heat pump system can accurately achieve the optimal energy efficiency state after the compressor frequency is adjusted.

[0119] In other embodiments, when the frequency control parameter includes increasing the compressor frequency or decreasing the compressor frequency, the compressor adjustment frequency may also be controlled according to a preset fixed frequency adjustment value and frequency control parameter.

[0120] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, referring to Figure 7 , the control method of the heat pump system further includes:

[0121] Step S01, obtaining the operation mode of the heat pump system;

[0122] In this embodiment, the operation mode can be specifically determined according to the mode setting parameters input by the user. In other embodiments, the operation mode can also be determined according to the actual operation state of the heat pump system, for example, the temperature difference between the temperature of the energy storage device and the target energy storage temperature can be obtained, and when the temperature difference is greater than or equal to the preset value, the second mode is determined to be the operation mode of the heat pump system; when the temperature difference is less than the preset value, the first mode is determined to be the operation mode of the heat pump system.

[0123] Step S02, when the operation mode is the first mode, executing the step of obtaining the first condensing temperature of the heat pump system and the first temperature of the energy storage device;

[0124] Step S03, when the operation mode is the second mode, obtaining a second condensing temperature of the heat pump system, and controlling the operation frequency of the compressor according to the second condensing temperature and a preset protection temperature;

[0125] The energy efficiency value of the heat pump system corresponding to the first mode is greater than a preset energy efficiency value, and the energy storage rate of the energy storage device corresponding to the second mode is greater than a preset rate.

[0126] The energy efficiency value of the heat pump system corresponding to the first mode is greater than the energy efficiency value of the heat pump system corresponding to the second mode; the energy storage rate of the energy storage device corresponding to the first mode is less than the energy storage rate of the energy storage device corresponding to the second mode.

[0127] Among them, the target frequency of the compressor can be determined according to the second condensing temperature and the preset protection temperature, and the compressor operation can be controlled according to the target frequency; or, the frequency adjustment parameters of the compressor can be determined according to the second condensing temperature and the preset protection temperature, and the compressor can be controlled to adjust the current frequency operation according to the frequency adjustment parameters.

[0128] Specifically, the operating frequency of the compressor can be controlled according to the quantitative relationship or magnitude relationship between the second condensing temperature and the preset protection temperature. For example, a fourth temperature difference or ratio between the second condensing temperature and the preset protection temperature can be determined, and the operating frequency of the compressor can be controlled according to the fourth temperature difference or ratio.

[0129] In this embodiment, when the heat pump system operates in the efficient first mode, the compressor frequency is regulated in combination with the condensing temperature and the temperature of the energy storage device to improve energy efficiency; when the heat pump system operates in the fast energy storage second mode, the compressor operating frequency is regulated in combination with the second condensing temperature and the preset protection temperature, which is beneficial to protect the system while reducing unnecessary restrictions on the system frequency, so as to effectively improve the energy storage efficiency of the energy storage device and meet the fast energy storage needs.

[0130] Furthermore, in the present embodiment, the step of controlling the operating frequency of the compressor according to the second condensing temperature and the preset protection temperature includes: when the second condensing temperature is greater than or equal to the preset protection temperature, controlling the compressor to operate at a reduced frequency; when the second condensing temperature is lower than the preset protection temperature, and the temperature difference between the preset protection temperature and the second condensing temperature is greater than a preset value, controlling the compressor to operate at an increased frequency; when the second condensing temperature is lower than the preset protection temperature, and the temperature difference between the preset protection temperature and the second condensing temperature is less than or equal to a preset value, controlling the compressor to maintain operating at the current frequency.

[0131] The preset value is specifically a critical value of the temperature difference between the preset protection temperature and the second condensing temperature for distinguishing whether the heat pump system has a reliability risk.

[0132] When the second condensing temperature is lower than the preset protection temperature, and the temperature difference between the preset protection temperature and the second condensing temperature is higher than the preset value, it indicates that there is no reliability risk in the heat pump system at this time; when the second condensing temperature is lower than the preset protection temperature, and the temperature difference between the preset protection temperature and the second condensing temperature is lower than or equal to the preset value, it indicates that there is a reliability risk in the system at this time; when the second condensing temperature is higher than or equal to the preset protection temperature, it indicates that the system reliability is insufficient at this time.

[0133] In this embodiment, in the second mode of rapid energy storage, when the second condensing temperature is lower than the preset protection temperature and the temperature difference is large enough, to ensure that the heat pump system does not have reliability risks even if the frequency is increased, the compressor is controlled to increase the frequency, which is beneficial to increase the amount of heat provided by the system to the energy storage device, thereby further improving the energy storage efficiency of the energy storage device; when the second condensing temperature is lower than the preset protection temperature and the temperature difference is small, indicating that the heat pump system has reliability risks, the compressor maintains the current frequency operation, which is beneficial to ensure energy storage efficiency while avoiding increased system reliability risks; when the second condensing temperature exceeds the preset protection temperature, indicating that the system reliability is insufficient, the compressor reduces the frequency operation, which is beneficial to effectively improve the system operation reliability and avoid damage to the heat pump system.

[0134] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program of a heat pump system is stored. When the control program of the heat pump system is executed by a processor, the relevant steps of any embodiment of the control method of the heat pump system are implemented.

[0135] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0136] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0137] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, including a number of instructions for a terminal device (which can be a mobile phone, computer, server, heat pump system, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0138] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a heat pump system, characterized in that: The heat pump system includes a refrigerant circulation loop, the refrigerant circulation loop includes a compressor and an energy storage device, the energy storage device is used to store energy flowing through the refrigerant, and the control method of the heat pump system includes the following steps: Acquiring a first condensing temperature of the heat pump system and a first temperature of the energy storage device; determining a frequency control parameter of the compressor according to the first condensing temperature and a first temperature of the energy storage device; The operation of the compressor is controlled according to the frequency control parameter.

2. The control method of the heat pump system according to claim 1, characterized in that: The step of determining the frequency control parameter of the compressor according to the first condensing temperature and the first temperature of the energy storage device comprises: determining a first temperature difference between the first condensation temperature and the first temperature; The frequency control parameter is determined according to the relationship between the first temperature difference value and a preset temperature difference range.

3. The control method of the heat pump system according to claim 2, characterized in that: The refrigerant main circuit further includes an outdoor heat exchanger connected to the compressor, and the step of determining the frequency control parameter according to the relationship between the first temperature difference value and the preset temperature difference range includes: When the first temperature difference value is greater than an upper limit value of a preset temperature difference interval, determining the frequency control parameter includes reducing the compressor frequency; When the first temperature difference value is less than the lower limit value of the preset temperature difference interval, determining the frequency control parameter includes increasing the compressor frequency; When the first temperature difference value is within the preset temperature difference range, the frequency control parameter is determined according to the second temperature of the outdoor heat exchanger and the ambient temperature corresponding to the heat pump system.

4. The control method of the heat pump system according to claim 3, characterized in that: The step of determining the frequency control parameter according to the second temperature of the outdoor heat exchanger and the ambient temperature corresponding to the heat pump system comprises: determining a second temperature difference between the ambient temperature and the second temperature; When the second temperature difference value is less than a preset temperature difference, determining the frequency control parameter includes increasing the compressor frequency; When the second temperature difference is greater than or equal to a preset temperature difference, determining the frequency control parameter includes maintaining the compressor frequency unchanged.

5. The control method of the heat pump system according to claim 2, characterized in that: After the step of obtaining the first condensing temperature of the heat pump system and the first temperature of the energy storage device, the method further includes: When the first condensing temperature is greater than or equal to a preset protection temperature, determining the frequency control parameter includes reducing the compressor frequency; When the first condensing temperature is lower than the preset protection temperature, the step of determining the frequency control parameter of the compressor according to the first condensing temperature and the first temperature of the energy storage device is performed.

6. The control method of the heat pump system according to claim 1, characterized in that: The refrigerant main circuit also includes an outdoor heat exchanger connected to the compressor, and the step of controlling the operation of the compressor according to the frequency control parameter includes: When the frequency control parameter includes increasing the compressor frequency or decreasing the compressor frequency, determining a frequency adjustment value according to the first condensing temperature, the first temperature, the second temperature of the outdoor heat exchanger, and the ambient temperature corresponding to the heat pump system; The compressor is controlled to adjust the frequency according to the frequency adjustment value and the frequency control parameter.

7. The control method of a heat pump system according to any one of claims 1 to 6, characterized in that: The control method of the heat pump system further includes: Obtaining an operating mode of the heat pump system; When the operation mode is the first mode, performing the step of obtaining the first condensing temperature of the heat pump system and the first temperature of the energy storage device; When the operation mode is the second mode, obtaining a second condensing temperature of the heat pump system, and controlling the operation frequency of the compressor according to the second condensing temperature and a preset protection temperature; The energy efficiency value of the heat pump system corresponding to the first mode is greater than a preset energy efficiency value, and the energy storage rate of the energy storage device corresponding to the second mode is greater than a preset rate.

8. The control method of the heat pump system according to claim 7, characterized in that: The step of controlling the operating frequency of the compressor according to the second condensing temperature and the preset protection temperature comprises: When the second condensing temperature is greater than or equal to a preset protection temperature, controlling the compressor to operate at a reduced frequency; When the second condensing temperature is lower than the preset protection temperature, and the temperature difference between the preset protection temperature and the second condensing temperature is greater than a preset value, controlling the compressor to increase the frequency of operation; When the second condensing temperature is lower than the preset protection temperature, and the temperature difference between the preset protection temperature and the second condensing temperature is lower than or equal to a preset value, the compressor is controlled to maintain the current frequency operation.

9. A heat pump system, characterized in that: The heat pump system comprises a control device and a refrigerant circulation loop, wherein the refrigerant circulation loop comprises a compressor and an energy storage device, wherein the energy storage device is used to store energy flowing through the refrigerant; The compressor is connected to the control device, which includes: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor, wherein the control program of the heat pump system, when executed by the processor, implements the steps of the control method of the heat pump system as described in any one of claims 1 to 8.

10. A storage medium, characterized in that: The storage medium stores a control program of the heat pump system, and when the control program of the heat pump system is executed by the processor, the steps of the control method of the heat pump system according to any one of claims 1 to 8 are implemented.

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