Heat pump system control method, heat pump system, and storage medium

Abstract

A heat pump system control method, a heat pump system, and a storage medium. The heat pump system comprises a refrigerant main path and a refrigerant branch connected to the refrigerant main path; the refrigerant main path comprises an indoor heat exchanger (21) and a compressor (1); and the refrigerant branch comprises an energy storage device (7). The method comprises: when the heat pump system is started in a preset mode, acquiring an energy demand parameter of the energy storage device (7); controlling the operating frequency of the compressor (1) according to the energy demand parameter; and when the operation of the heat pump system satisfies a preset condition, acquiring the system pressure of the heat pump system; and controlling the operating frequency of the compressor (1) according to the system pressure, wherein in the preset mode, the indoor heat exchanger (21) is not in a heat exchange state, and the energy storage device (7) is in an energy storage state.

Description

Heat pump system control method, heat pump system and storage medium

[0001] This application claims priority to Chinese patent application No. 202310801139.5 filed on June 30, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of heat pump technology, and in particular to a control method for a heat pump system, a heat pump system, and a storage medium. Background Art

[0003] In addition to using energy to regulate the indoor environment, heat pump systems also incorporate energy storage devices, such as water tanks, to provide energy for other needs. Heat pump systems typically have a dedicated energy storage mode, during which they stop regulating the indoor air and instead store energy in the energy storage device.

[0004] In standalone energy storage mode, the heat pump system generally adjusts the operating frequency of the compressor according to the outdoor ambient temperature and the temperature of the energy storage device to achieve rapid energy storage. However, temperature regulation has a lag, which can easily lead to untimely adjustment of the compressor frequency, affecting the energy storage effect of the energy storage device. Technical issues

[0005] The main purpose of this application is to provide a control method for a heat pump system, a heat pump system and a storage medium, aiming to achieve rapid energy storage while improving the timeliness of compressor frequency adjustment to improve the energy storage effect. Technical Solutions

[0006] To achieve the above objectives, the present application provides a control method for a heat pump system, the heat pump system comprising a main refrigerant circuit and a refrigerant branch circuit connected to the main refrigerant circuit, the main refrigerant circuit comprising an indoor heat exchanger and a compressor, the refrigerant branch circuit comprising an energy storage device, and the control method for the heat pump system comprising the following steps:

[0007] When the heat pump system starts a preset mode, obtaining energy demand parameters of the energy storage device;

[0008] controlling the operating frequency of the compressor according to the energy demand parameter;

[0009] When the operation of the heat pump system reaches a preset condition, obtaining the system pressure of the heat pump system;

[0010] controlling the operating frequency of the compressor according to the system pressure;

[0011] Wherein, in the preset mode, the indoor heat exchanger is not in a heat exchange state, and the energy storage device is in an energy storage state.

[0012] In one embodiment, the step of controlling the operating frequency of the compressor according to the energy demand parameter comprises:

[0013] Correcting the energy demand parameter according to the target correction value to obtain the initial frequency of the compressor;

[0014] controlling the compressor to operate at the initial frequency;

[0015] The target correction value is determined according to the exhaust parameters of the compressor.

[0016] In one embodiment, the step of obtaining the energy requirement parameter of the energy storage device includes:

[0017] Obtaining an actual energy demand value of the energy storage device under current operating conditions and a rated energy demand value of the energy storage device;

[0018] The energy demand parameter is determined according to the actual energy demand value and the rated energy demand value.

[0019] In one embodiment, the step of obtaining the actual energy requirement value of the energy storage device under the current working condition includes:

[0020] Acquiring the energy storage temperature of the energy storage device and the outdoor ambient temperature corresponding to the heat pump system;

[0021] The actual energy requirement value is determined according to the energy storage temperature and the outdoor ambient temperature.

[0022] In one embodiment, the step of obtaining the rated energy demand value includes:

[0023] Obtaining the volume of the energy storage device for storing energy storage material;

[0024] The rated energy demand is determined according to the volume.

[0025] In one embodiment, the step of controlling the operating frequency of the compressor according to the system pressure includes:

[0026] controlling the operating frequency of the compressor according to the system pressure and the target pressure of the heat pump system;

[0027] Wherein, the target pressure is determined according to the energy storage temperature of the energy storage device.

[0028] In one embodiment, the target pressure is defined as Tm and the energy storage temperature is defined as Tw, and the target pressure and the energy storage temperature satisfy the following quantitative relationship:

[0029] T m =a*T w 2 +b*T w+c, where a, b, and c are constants.

[0030] In one embodiment, the step of controlling the operating frequency of the compressor according to the system pressure and the target pressure of the heat pump system includes:

[0031] determining a pressure difference between the target pressure and the system pressure;

[0032] When the pressure difference is greater than a first threshold, controlling the compressor to increase the operating frequency;

[0033] When the pressure difference is less than or equal to a second threshold, controlling the compressor to reduce the operating frequency;

[0034] The second threshold is less than or equal to the first threshold.

[0035] In one embodiment, after the step of controlling the operating frequency of the compressor according to the system pressure, the method further comprises:

[0036] determining a target duration according to a deviation between a target pressure of the heat pump system and the system pressure, wherein the target duration is negatively correlated with the deviation;

[0037] After the target time period, the process returns to the step of obtaining the system pressure of the heat pump system.

[0038] In addition, to achieve the above-mentioned purpose, the present application also proposes a heat pump system, the heat pump system including a control device, a refrigerant main circuit and a refrigerant branch circuit, the refrigerant main circuit including an indoor heat exchanger and a compressor, and the refrigerant branch circuit including an energy storage device;

[0039] 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 runnable 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.

[0040] 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. Beneficial effects

[0041] The present application proposes a control method for a heat pump system, which is based on a heat pump system including a refrigerant main circuit and a refrigerant branch circuit, and an energy storage device is provided in the refrigerant branch circuit. After the heat pump system starts a preset mode, the method no longer fixedly regulates the operating frequency of the compressor according to the outdoor ambient temperature and the temperature of the energy storage device. First, in the initial stage, the operating frequency of the compressor is controlled based on the energy demand of the energy storage device. At this time, the energy demand of the energy storage device is large, and regulating the frequency according to the energy demand is conducive to achieving rapid energy storage. After the operation of the heat pump system reaches the preset conditions, the operating frequency of the compressor is adjusted according to the system pressure. Since the current energy storage effect of the system can be accurately characterized by the system pressure, the operating frequency of the compressor is controlled according to the system pressure, which can achieve rapid energy storage while improving the timeliness of the compressor frequency adjustment to improve the energy storage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 is a schematic diagram of the refrigerant flow path structure in an embodiment of the heat pump system of the present application;

[0043] FIG2 is a schematic diagram of the hardware structure involved in the operation of an embodiment of the heat pump system of the present application;

[0044] FIG3 is a flow chart of an embodiment of a control method for a heat pump system of the present application;

[0045] FIG4 is a flow chart of another embodiment of a control method for a heat pump system according to the present application;

[0046] FIG5 is a flow chart of another embodiment of a control method for a heat pump system according to the present application;

[0047] FIG6 is a flow chart of another embodiment of a control method for a heat pump system of the present application.

[0048] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0049] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0050] An embodiment of the present application provides a heat pump system.

[0051] In the embodiment of the present application, referring to Figures 1 and 2 , the heat pump system includes a control device 100, a main refrigerant circuit, and a refrigerant branch circuit connected to the main refrigerant circuit. The main refrigerant circuit includes a compressor 1, an indoor unit, an outdoor heat exchanger 3, a throttling device 4, and a reversing assembly 5. The refrigerant branch circuit includes an energy storage device 7 and a first control valve 8. The indoor unit, the reversing assembly 5, the compressor 1, the throttling device 4, and the first control valve 8 are all connected to the control device 100. The throttling device 4 and the first control valve 8 can both be electronic expansion valves.

[0052] In one embodiment, energy storage device 7 comprises a water tank (e.g., a water heater), and external water-using equipment can be connected to the water tank to utilize the energy-stored water in energy storage device 7. In other embodiments, energy storage device 7 may also include other types of devices with energy storage functions. When the refrigerant in the refrigerant branch flows through energy storage device 7, it can exchange heat with the energy storage material therein, which absorbs and stores the energy of the refrigerant.

[0053] In one embodiment, one end of the refrigerant branch is connected to the exhaust port of the compressor 1, and the pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the other end of the refrigerant branch.

[0054] In one embodiment, the heat pump system may further be provided with a flow direction regulating member, wherein the pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the second end of the refrigerant branch, and the return air port of the compressor 1, the exhaust port of the compressor 1, and the first end of the refrigerant branch are all connected to the flow direction regulating member, and the refrigerant branch is switched between being connected to the return air port of the compressor 1 and being connected to the exhaust port of the compressor 1 by the flow direction regulating member. The refrigerant branch is connected to the exhaust port of the compressor 1 through one end of the refrigerant branch.

[0055] In one embodiment, the number of indoor units is more than one, and the more than one indoor units can be connected in parallel. In other embodiments, the number of indoor units can also be one.

[0056] The indoor unit includes an indoor heat exchanger 21 and a second control valve 22 connected in series with the indoor heat exchanger 21. The second control valve 22 is connected to the control device 100, which can be used to control the refrigerant flow through the indoor heat exchanger 21. The second control valve 22 can be an electronic expansion valve.

[0057] The indoor unit, throttling device 4, and outdoor heat exchanger 3 are connected in sequence. The pipe between the throttling device 4 and the indoor unit is connected to one end of the refrigerant branch. The indoor unit, outdoor heat exchanger 3, the exhaust port of compressor 1, and the return air port of compressor 1 are all connected to the reversing assembly 5. The reversing assembly 5 can be used to switch the connection between the indoor unit and outdoor heat exchanger 3 and the exhaust port and return air port of compressor 1.

[0058] In one embodiment, the reversing assembly 5 includes a first reversing valve 51 and a second reversing valve 52. The exhaust port of the compressor 1, the return air port of the compressor 1, and the indoor unit are respectively connected to different valve ports of the first reversing valve 51, while the exhaust port of the compressor 1, the return air port of the compressor 1, and the outdoor heat exchanger 3 are respectively connected to different valve ports of the second reversing valve 52. In one implementation of this embodiment, the first reversing valve 51 is a first four-way valve, and the second reversing valve 52 is a second four-way valve. In another embodiment, the first reversing valve 51 is a first three-way valve, and the second reversing valve 52 is a second three-way valve.

[0059] The first reversing valve 51 has a first valve position and a second valve position state. When the first reversing valve 51 is in the first valve position state, the return air port of the compressor 1 is connected to the indoor heat exchanger 21, and the exhaust port of the compressor 1 is blocked from the indoor heat exchanger 21. When the first reversing valve 51 is in the second valve position, the return air port of the compressor 1 is blocked from the indoor heat exchanger 21, and the exhaust port of the compressor 1 is connected to the indoor heat exchanger 21.

[0060] The second reversing valve 52 has a third valve position and a fourth valve position state. When the second reversing valve 52 is in the third valve position state, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 3, and the return air port of the compressor 1 is blocked from the outdoor heat exchanger 3; when the second reversing valve 52 is in the fourth valve position, the exhaust port of the compressor 1 is blocked from the outdoor heat exchanger 3, and the return air port of the compressor 1 is connected to the outdoor heat exchanger 3.

[0061] In some embodiments, the reversing assembly 5 may further include a switching valve (not shown). The reversing assembly 5 (switching valve) may be used to switch the connection between the energy storage device 7 and the exhaust port of the compressor 1 and the return port of the compressor 1. The switching valve may be a three-way valve or a four-way valve, and the switching valve includes a first switching state and a second switching state. When the switching valve is in the first switching state, the return port of the compressor 1 is connected to the energy storage device 7; when the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7.

[0062] Through the regulation of the first reversing valve 51, the second reversing valve 52, the first control valve 8 and the second control valve 22, the operation modes of the heat pump system include but are not limited to the following modes:

[0063] In the first mode, referring to Figure 1 , the first reversing valve 51 operates in the first position, the second reversing valve 52 operates in the fourth position, the second control valve 22 is closed, and the first control valve 8 is open. The refrigerant branch is connected to the exhaust port of compressor 1 (when the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state). All refrigerant discharged from compressor 1 flows into the refrigerant branch. Heat from the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 as it passes through the energy storage device 7. The refrigerant flowing out of the refrigerant branch flows through the throttling device 4 and the outdoor heat exchanger 3 before returning to the compressor 1. In the first mode, the indoor heat exchanger 21 stops exchanging heat, the outdoor heat exchanger 3 is in the evaporating state, and the energy storage device 7 is in the condensing state. All heat is used to store heat in the energy storage device 7. In the first mode, heat can be stored in the energy storage device 7 alone.

[0064] In the second mode, the first reversing valve 51 operates in the first position, the second reversing valve 52 operates in the third position, the first control valve 8 is open, and the second control valve 22 is open. The refrigerant branch circuit is connected to the exhaust port of compressor 1 (when the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state). A portion of the refrigerant discharged from compressor 1 flows sequentially through the outdoor heat exchanger 3 and the throttling device 4. The remaining portion of the refrigerant discharged from compressor 1 flows into the refrigerant branch circuit. The refrigerant flowing into the refrigerant branch circuit stores heat in the energy storage device 7 as it flows through the energy storage device 7. The refrigerant flowing out of the refrigerant branch circuit merges with the refrigerant flowing out of the throttling device 4, flows into the indoor unit for evaporation, and then flows back to compressor 1. In the second mode, the indoor heat exchanger 21 is in the evaporating state, and the outdoor heat exchanger 3 is in the condensing state. In the second mode, when the indoor space conditioned by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21. In the second mode, when the indoor space conditioned by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the second mode, the heat absorbed by the outdoor heat exchanger 3 from its environment can be stored in the energy storage device 7. In the second mode, the indoor environment can be cooled while the energy storage device 7 stores heat, or the compressor 1 oil in the refrigerant branch can be returned to the compressor 1 while the energy storage device 7 stores heat.

[0065] In the third mode, first reversing valve 51 operates in the first valve position, second reversing valve 52 operates in the fourth valve position, first control valve 8 is open, and second control valve 22 operates in a throttling state. The refrigerant branch is connected to the exhaust port of compressor 1 (when reversing assembly 5 includes a switching valve, the switching valve is in the second switching state). All refrigerant discharged from compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 as it flows through the energy storage device 7. A portion of the refrigerant flowing out of the refrigerant branch flows through the throttling device 4 and the outdoor heat exchanger 3 in sequence before returning to compressor 1. The remaining portion of the refrigerant flowing out of the refrigerant branch flows through the second control valve 22 and the indoor heat exchanger 21 in sequence before returning to compressor 1. In the third mode, both the indoor heat exchanger 21 and the outdoor heat exchanger 3 are in an evaporating state. In the third mode, when the indoor space conditioned by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21. In the third mode, when the indoor space conditioned by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the third mode, the heat absorbed from the surroundings by the indoor heat exchanger 21 and the outdoor heat exchanger 3 can be stored in the energy storage device 7. In the third mode, the indoor environment can be cooled while the energy storage device 7 stores heat.

[0066] In the fourth mode, the first reversing valve 51 operates in the first position, the second reversing valve 52 operates in the third position, the first control valve 8 is closed, and the second control valve 22 is open. The refrigerant discharged from the compressor 1 flows sequentially through the outdoor heat exchanger 3, the throttling device 4, the second control valve 22, and the indoor heat exchanger 21 before returning to the compressor 1. In the fourth mode, the indoor heat exchanger 21 is in an evaporating state, and the outdoor heat exchanger 3 is in a condensing state. In the fourth mode, when the indoor space conditioned by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21. In the fourth mode, when the indoor space conditioned by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the fourth mode, the indoor environment can be cooled while the energy storage device 7 stops storing heat.

[0067] In other embodiments, the reversing assembly 5 may also include a third four-way valve, and the exhaust port of the compressor 1, the return air port of the compressor 1, the indoor heat exchanger 21 and the outdoor heat exchanger 3 are respectively connected to different valve ports of the third four-way valve.

[0068] 1 and 2 , the heat pump system further includes a pressure sensor 01 , which can be provided on the exhaust side of the compressor 1 to detect the condensing pressure of the heat pump system. The pressure sensor 01 is connected to the control device 100 .

[0069] 2 , the heat pump system further includes a temperature detection module 02 , which is connected to the control device 100 . The temperature detection module 02 may be disposed inside the energy storage device 7 to detect the energy storage temperature of the energy storage device 7 .

[0070] 2 , the heat pump system further includes an environment detection module 03, which is connected to the control device 100. The environment detection module 03 can be set in an outdoor environment to detect the outdoor environment temperature.

[0071] In the embodiment of the present application, referring to FIG2 , the control device for a heat pump system includes a processor 1001, such as a CPU, a memory 1002, and a timer 1003. These components communicate with each other via a communication bus. Memory 1002 can be high-speed RAM or non-volatile memory, such as a disk drive. Memory 1002 can also be a storage device independent of processor 1001.

[0072] Those skilled in the art will understand that the device structure shown in FIG2 does not constitute a limitation on the device, and may include more or fewer components than shown, or a combination of certain components, or a different arrangement of components.

[0073] As shown in FIG. 2 , the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0074] In the device shown in FIG. 2 , the processor 1001 may be configured to call a control program of the heat pump system stored in the memory 1002 and execute relevant steps of the control method of the heat pump system in the following embodiments.

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

[0076] 3 , an embodiment of a control method for a heat pump system of the present application is proposed. In one embodiment, the control method for a heat pump system includes:

[0077] Step S10, when the heat pump system starts a preset mode, obtaining energy demand parameters of the energy storage device; wherein, in the preset mode, the indoor heat exchanger is not in a heat exchange state, and the energy storage device is in an energy storage state;

[0078] In one embodiment, the exhaust port of the compressor is connected to one end of the refrigerant branch, and the preset mode is the first mode described above, that is, the heat storage mode. In other embodiments, the return air port of the compressor is connected to one end of the refrigerant branch, and the preset mode is also the cold storage mode.

[0079] The energy demand parameter is specifically a state parameter that characterizes the demand of the energy storage device for the output capacity of the compressor in a preset mode.

[0080] The energy demand parameters may be determined based on detection data inside the energy storage device and / or detection data of the environment in which the heat pump system is located.

[0081] After the heat pump system starts the preset mode, when the heat pump system does not meet the preset conditions, the energy demand parameters can be obtained at intervals of a first time, and the operating frequency of the compressor can be controlled according to the energy demand parameters until the heat pump system operates to meet the preset conditions.

[0082] Step S20, controlling the operating frequency of the compressor according to the energy demand parameter;

[0083] In an implementation of this embodiment, a target frequency at which the compressor needs to operate is determined according to energy demand parameters, and the compressor is controlled to operate at the target frequency.

[0084] In one embodiment, a frequency adjustment value of the compressor is determined according to the energy demand parameter, and the compressor is controlled to adjust the current frequency according to the frequency adjustment value.

[0085] In one embodiment, a frequency limit value of the compressor is determined according to an energy demand parameter, and the compressor is controlled to operate at a frequency within a frequency range limited by the frequency limit value.

[0086] Step S30, when the operation of the heat pump system reaches a preset condition, obtaining the system pressure of the heat pump system;

[0087] The preset conditions may represent the operating parameters of the heat pump system itself and / or the environmental state parameters of the environment in which the heat pump system is located when the preset mode reaches a stable operating state after being started.

[0088] In one embodiment, the preset condition includes that the running time after the preset mode is activated is greater than or equal to the preset time. In other embodiments, the preset condition may also include that the temperature change value of the energy storage device is greater than or equal to the preset change value.

[0089] In one embodiment, one end of the refrigerant branch is connected to the exhaust port of the compressor, and the system pressure is a high pressure, which is specifically detected by the above-mentioned pressure sensor. In other embodiments, the system pressure can also be a low pressure.

[0090] Step S40: controlling the operating frequency of the compressor according to the system pressure.

[0091] In one embodiment, a target frequency at which the compressor needs to operate is determined according to the system pressure, and the compressor is controlled to operate at the target frequency.

[0092] In one embodiment, a frequency adjustment value of the compressor is determined according to the system pressure, and the compressor is controlled to adjust the current frequency according to the frequency adjustment value.

[0093] In one embodiment, a frequency limit value of the compressor is determined according to the system pressure, and the compressor is controlled to operate at a frequency within a frequency range limited by the frequency limit value.

[0094] Here, after the preset mode is started, when the operation of the heat pump system does not meet the preset conditions, the heat pump system is in the initial stage of the preset mode. At this time, the heat pump system has not reached a stable operating state, and the energy demand of the energy storage device is large. At this time, the frequency of the compressor is adjusted according to the energy demand, which is beneficial to rapid energy storage while improving the operational stability of the heat pump system; when the operation of the heat pump system meets the preset conditions, the heat pump system is in the normal operating stage of the preset mode. At this time, the operation of the heat pump system reaches a stable state, and the energy demand of the energy demand device decreases. At this time, the frequency of the compressor is adjusted according to the system pressure, which is beneficial to improving the timeliness and accuracy of the adjustment of the compressor operating frequency, thereby ensuring that the energy storage device can accurately and quickly reach the required storage capacity and improve the energy storage effect.

[0095] A control method for a heat pump system proposed in an embodiment of the present application, after the heat pump system starts a preset mode, the operating frequency of the compressor is no longer fixedly regulated according to the outdoor ambient temperature and the temperature of the energy storage device. First, in the initial stage, the operating frequency of the compressor is controlled based on the energy demand of the energy storage device. At this time, the energy demand of the energy storage device is large, and regulating the frequency according to the energy demand is conducive to achieving rapid energy storage. After the heat pump system reaches the preset conditions, the operating frequency of the compressor is adjusted according to the system pressure. Since the current energy storage effect of the system can be accurately represented by the system pressure, controlling the operating frequency of the compressor according to the system pressure can achieve rapid energy storage while improving the timeliness of the compressor frequency adjustment, thereby improving the energy storage effect.

[0096] Furthermore, based on the above embodiment, another embodiment of the control method of the heat pump system of the present application is proposed. In one embodiment, referring to FIG4 , the step S20 includes:

[0097] Step S21, correcting the energy demand parameter according to a target correction value to obtain an initial frequency of the compressor; wherein the target correction value is determined according to an exhaust parameter of the compressor;

[0098] The exhaust parameters include exhaust pressure and / or exhaust temperature, etc. The exhaust parameters can be detected by a detection module provided on the exhaust side of the compressor or calculated based on the detection data of the detection module, etc.

[0099] The exhaust parameter may be the current exhaust parameter of the compressor, or may be a parameter determined based on a plurality of exhaust characteristic parameters of the compressor detected after starting in a preset mode.

[0100] Different exhaust parameters correspond to different target correction values.

[0101] In one embodiment, the target correction value is a correction coefficient, and the product of the energy requirement parameter and the correction coefficient is used as the initial frequency.

[0102] In other embodiments, the target correction value may also be a correction amplitude, and the sum of the required energy parameter and the correction amplitude is used as the initial frequency.

[0103] Step S22: controlling the compressor to operate at the initial frequency.

[0104] In one embodiment, during the initial operation phase of the preset mode, the energy requirement parameter is corrected according to the target correction value determined by the exhaust parameter of the compressor to obtain the operating frequency of the compressor during this phase, which is beneficial for rapid energy storage while improving the operating reliability of the compressor.

[0105] Furthermore, 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 one embodiment, referring to FIG5 , the step of obtaining the energy demand parameter of the energy storage device includes:

[0106] Step S11, obtaining the actual energy demand value of the energy storage device under the current working condition and the rated energy demand value of the energy storage device;

[0107] The actual energy demand value is related to the actual operating conditions of the energy storage device and may change with the actual operating conditions.

[0108] The rated energy demand is an energy demand value that is related to the inherent properties of the energy storage device and does not change with actual operating conditions.

[0109] Step S12: determining the energy requirement parameter according to the actual energy requirement value and the rated energy requirement value.

[0110] In one embodiment, the sum of the actual energy demand value and the rated energy demand value is determined as the energy demand parameter. In other embodiments, the rated energy demand value can also be used to determine a correction coefficient, and the actual energy demand value is corrected according to the correction coefficient to obtain the energy demand parameter.

[0111] In one embodiment, the energy demand parameters of the energy storage device are determined in combination with the actual energy demand value and the rated energy demand value, which is conducive to ensuring that the determined energy demand parameters can accurately reflect the capacity requirements of the energy storage device in the initial stage, thereby facilitating further improving the accuracy of the compressor operating frequency adjustment, thereby further improving the energy storage efficiency in the initial stage of the preset mode.

[0112] In other embodiments, one of the actual energy demand value and the rated energy demand value may be used as the energy demand parameter.

[0113] Furthermore, in one embodiment, the process of obtaining the actual energy requirement value is as follows: obtaining the energy storage temperature of the energy storage device and the outdoor ambient temperature corresponding to the heat pump system; and determining the actual energy requirement value based on the energy storage temperature and the outdoor ambient temperature.

[0114] The energy storage temperature is detected by the above-mentioned temperature sensor. The outdoor ambient temperature is detected by the above-mentioned environment detection module.

[0115] Different energy storage temperatures and different outdoor ambient temperatures correspond to different actual energy demand values. The actual energy demand value is negatively correlated with the outdoor ambient temperature, and the actual energy demand value is negatively correlated with the energy storage temperature.

[0116] Specifically, a correspondence between the energy storage temperature, the outdoor ambient temperature and the actual energy demand value can be established in advance. The correspondence may include a calculation formula, a mapping relationship, etc. Based on the correspondence, the actual energy demand value corresponding to the current energy storage temperature and the outdoor ambient temperature can be determined.

[0117] Furthermore, more than one correspondence relationship between the energy storage temperature, the outdoor ambient temperature and the actual energy demand value can be pre-set, and the target correspondence relationship can be determined in more than one correspondence relationship based on the operating speed of the outdoor fan corresponding to the outdoor heat exchanger and the temperature difference between the energy storage temperature and the target temperature, and the actual energy demand value corresponding to the current energy storage temperature and the outdoor ambient temperature can be determined based on the target correspondence relationship.

[0118] For example, the corresponding relationship between the outdoor ambient temperature T4, the energy storage temperature Tw and the actual energy demand value Aw is shown in Table 1 below:

[0119]

[0120] Table 1

[0121] Based on this, by determining the range of the outdoor ambient temperature in the above table and the range of the energy storage temperature in the above table, the energy demand value obtained by matching the two ranges is used as the actual energy demand value.

[0122] In one embodiment, the operating conditions of the preset mode can be accurately reflected by combining the outdoor ambient temperature and the energy storage temperature. Therefore, the actual energy demand value is determined according to the outdoor ambient temperature and the energy storage temperature, which helps to ensure that the actual energy demand value can accurately reflect the actual energy demand of the energy storage device under the current operating conditions, thereby helping to further improve the accuracy of the compressor frequency operation control and improve the energy storage efficiency of the energy storage device.

[0123] In other embodiments, the actual energy requirement value may be determined based on one of the outdoor ambient temperature and the energy storage temperature, or may be determined based on other parameters other than the outdoor ambient temperature and the energy storage temperature. The other parameters here may be, for example, the temperature difference between the energy storage temperature and the set temperature of the energy storage device and / or the temperature change rate of the outdoor heat exchanger and / or the temperature difference between the inner surface temperature and the outer surface temperature of the energy storage device and / or the temperature difference change rate between the inner surface temperature and the outer surface temperature of the energy storage device, and / or the temperature difference between the inner surface temperature and the outer surface temperature of the energy storage device, and / or the temperature difference between the inner surface temperature and the outer surface temperature of the energy storage device, and so on.

[0124] Furthermore, in one embodiment, the volume of the energy storage device for storing the energy storage material is obtained, and the rated energy demand is determined based on the volume. The volume and the rated energy demand are positively correlated.

[0125] For example, the volume and rated energy demand values ​​can be shown in Table 2 below:

[0126] Volume / L Rated energy demand Hw / kW 1502.8 2003.6

[0127] Table 2

[0128] In one embodiment, the rated energy requirement is determined based on the volume of the energy storage device, which helps to accurately reflect the energy requirement required by the energy storage device's own properties during the energy storage process, thereby helping to further improve the accuracy of the compressor frequency operation control and improve the energy storage efficiency of the energy storage device.

[0129] In other embodiments, the rated energy requirement value here may also be determined based on the shell thickness and material type of the energy storage device.

[0130] Furthermore, 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 one embodiment, referring to FIG6 , step S40 includes:

[0131] Step S41 : controlling the operating frequency of the compressor according to the system pressure and the target pressure of the heat pump system; wherein the target pressure is determined according to the energy storage temperature of the energy storage device.

[0132] Determine the magnitude or quantitative relationship (such as a ratio or difference) between the system pressure and the target pressure, determine the frequency adjustment value of the compressor based on the magnitude or quantitative relationship, adjust the operating frequency of the compressor according to the frequency adjustment value to obtain the target frequency of the compressor, and control the compressor to operate at the target frequency.

[0133] Different energy storage temperatures correspond to different target pressures. In one embodiment, the energy storage temperature and target pressure are positively correlated. A correspondence between the energy storage temperature and the target pressure is pre-established. The correspondence may include a quantitative relationship, a mapping relationship, etc. Based on this correspondence, the target pressure corresponding to the current energy storage temperature can be determined.

[0134] In one embodiment, the target pressure is defined as Tm and the energy storage temperature is defined as Tw, and the target pressure and the energy storage temperature satisfy the following quantitative relationship: T m =a*T w 2 +b*T w +c, where a, b, and c are constants. The value range of a is [0.001, 0.003], the value range of b is [0.5, 0.8], and the value range of c is [18, 22]. Based on this, the target pressure can be calculated by substituting the energy storage temperature into the above quantitative relationship.

[0135] In other embodiments, a mapping table between target pressure and energy storage temperature may be pre-established, and the target pressure may be obtained by querying the mapping table based on the energy storage temperature.

[0136] In one embodiment, regulating the compressor operating frequency based on the target pressure and system pressure determined based on the energy storage temperature further improves the accuracy of the target pressure. This ensures that when the compressor operating frequency is regulated based on the target pressure and system pressure, the timeliness and accuracy of the compressor operating frequency regulation are effectively improved, ensuring that the compressor output capacity is precisely matched to the energy storage requirements of the energy storage device, thereby further improving the energy storage effect. Specifically, when the target pressure and the energy storage temperature satisfy the aforementioned quantitative relationship, the accuracy of the target pressure is further improved, thereby improving the energy storage effect. Furthermore, when a, b, and c are set according to the above parameter ranges, as the energy storage temperature increases, the increase in the target pressure corresponding to the preset amplitude of the energy storage temperature change tends to decrease. That is, when the energy storage temperature is low, the increase in the target pressure is large when the energy storage temperature increases by the preset amplitude; when the energy storage temperature is high, the increase in the target pressure is small when the energy storage temperature increases by the preset amplitude. Based on this, it is beneficial to ensure that the system high pressure can be quickly increased in the initial stage of startup in the initial stage of the preset mode to effectively ensure that there is sufficient heat for heat storage in the energy storage device. After the temperature of the energy storage device has increased to a certain extent, the system high pressure can be smoothly increased, which is beneficial to rapid heat storage efficiency while further improving the operational stability of the heat pump system.

[0137] Furthermore, in one embodiment, the step of controlling the operating frequency of the compressor according to the system pressure and the target pressure of the heat pump system includes: determining the pressure difference between the target pressure and the system pressure; when the pressure difference is greater than a first threshold, controlling the compressor to increase the operating frequency; when the pressure difference is less than or equal to a second threshold, controlling the compressor to reduce the operating frequency; wherein the second threshold is less than or equal to the first threshold.

[0138] In one embodiment, the second threshold is smaller than the first threshold, the first threshold is greater than 0, and the second threshold is less than 0.

[0139] The pressure difference is the result of subtracting the system pressure from the target pressure. When the target pressure is greater than the system pressure, the pressure difference is greater than 0; when the target pressure is less than the system pressure, the pressure difference is less than 0.

[0140] When the compressor increases or decreases its operating frequency, the frequency adjustment value of the compressor can be a pre-set fixed value, or a value determined according to the actual operating status of the heat pump system. For example, the frequency adjustment value here can be determined based on the opening of the above-mentioned first control valve and / or the temperature of the refrigerant heat dissipation module set between the first control valve and the throttling device and / or the temperature difference between the outdoor heat exchanger temperature and the outdoor ambient temperature, etc., wherein the refrigerant heat dissipation module is used to dissipate heat from the heat-generating components. The frequency adjustment value determined based on this is conducive to further improving the accuracy of the compressor operating frequency adjustment, thereby improving the energy storage effect while preventing condensation on the cooling module.

[0141] In one embodiment, the operating frequency of the compressor is increased or decreased according to the pressure difference between the target pressure and the system pressure, which helps to ensure that the system pressure can accurately reach the target pressure after the operating frequency of the compressor is adjusted, thereby further improving the energy storage effect.

[0142] Furthermore, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed, which, after step S40, further includes:

[0143] Step S50, determining a target duration according to a deviation between a target pressure of the heat pump system and the system pressure, wherein the target duration is negatively correlated with the deviation;

[0144] The target pressure here is the same as the target pressure mentioned above. The deviation here is the absolute value of the pressure difference mentioned above. For example, the relationship between the target duration and the pressure difference X is shown in Table 3 below:

[0145] Pressure difference (Pa) X<-3 -3≤X<-2 -2≤X<-1 -1≤X<11≤X<22≤X<3X≥3 Target duration (seconds) 30601201801209060

[0146] Table 3

[0147] As can be seen from Table 3, the positive and negative values ​​of the pressure difference can represent the size relationship between the target pressure and the system pressure. When the target pressure is greater than the system pressure or the target pressure is less than the preset pressure, the larger the deviation, the shorter the target time, and the smaller the deviation, the longer the target time.

[0148] Step S60: After the target time period, return to the step of obtaining the system pressure of the heat pump system.

[0149] In one embodiment, the interval adjustment period of the compressor operating frequency is determined based on the deviation between the target pressure and the system pressure, which is beneficial for ensuring that the system pressure accurately reaches the target pressure while reducing unnecessary adjustments to the compressor frequency, thereby improving the energy storage effect of the heat pump system and improving the operating stability of the compressor.

[0150] In addition, an embodiment of the present application 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.

[0151] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0152] The above different embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0153] 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 the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the existing technology, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling 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 application.

[0154] The above are merely optional embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for a heat pump system, wherein: The heat pump system comprises a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprises an indoor heat exchanger and a compressor, the refrigerant branch circuit comprises an energy storage device, and the control method of the heat pump system comprises the following steps: When the heat pump system starts a preset mode, obtaining energy demand parameters of the energy storage device; controlling the operating frequency of the compressor according to the energy demand parameter; When the operation of the heat pump system reaches a preset condition, obtaining the system pressure of the heat pump system; controlling the operating frequency of the compressor according to the system pressure; Wherein, in the preset mode, the indoor heat exchanger is not in a heat exchange state, and the energy storage device is in an energy storage state.

2. The control method of the heat pump system according to claim 1, wherein: The step of controlling the operating frequency of the compressor according to the energy demand parameter comprises: Correcting the energy demand parameter according to the target correction value to obtain the initial frequency of the compressor; controlling the compressor to operate at the initial frequency; Wherein, the target correction value is determined according to the exhaust parameter of the compressor.

3. The control method of the heat pump system according to claim 1, wherein: The step of obtaining the energy requirement parameter of the energy storage device comprises: Obtaining an actual energy requirement value of the energy storage device under current working conditions and a rated energy requirement value of the energy storage device; The energy demand parameter is determined according to the actual energy demand value and the rated energy demand value.

4. The control method of the heat pump system according to claim 3, wherein: The step of obtaining the actual energy demand value of the energy storage device under the current working condition comprises: Acquire the energy storage temperature of the energy storage device and the outdoor ambient temperature corresponding to the heat pump system; The actual energy requirement value is determined according to the energy storage temperature and the outdoor ambient temperature.

5. The control method of the heat pump system according to claim 3, wherein: The steps of obtaining the rated energy demand value include: Obtaining the volume of the energy storage device for storing energy storage material; The rated energy demand is determined based on the volume.

6. The control method of the heat pump system according to any one of claims 1 to 5, wherein: The step of controlling the operating frequency of the compressor according to the system pressure comprises: controlling the operating frequency of the compressor according to the system pressure and the target pressure of the heat pump system; Wherein, the target pressure is determined according to the energy storage temperature of the energy storage device.

7. The control method of the heat pump system according to claim 6, wherein: Define the target pressure as Tm and the energy storage temperature as Tw, then the target pressure and the energy storage temperature satisfy the following quantitative relationship: T m =a*T w 2 +b*T w +c, where a, b, and c are constants.

8. The control method of the heat pump system according to claim 6, wherein: The step of controlling the operating frequency of the compressor according to the system pressure and the target pressure of the heat pump system comprises: determining a pressure difference between the target pressure and the system pressure; When the pressure difference is greater than a first threshold, controlling the compressor to increase the operating frequency; When the pressure difference is less than or equal to a second threshold, controlling the compressor to reduce the operating frequency; The second threshold is less than or equal to the first threshold.

9. The control method of the heat pump system according to claim 6, wherein: After the step of controlling the operating frequency of the compressor according to the system pressure, the method further includes: Determining a target duration according to a deviation between a target pressure of the heat pump system and the system pressure, wherein the target duration is negatively correlated with the deviation; After the target time period, return to the step of obtaining the system pressure of the heat pump system.

10. A heat pump system, wherein: The heat pump system comprises a control device, a refrigerant main circuit and a refrigerant branch circuit, the refrigerant main circuit comprises an indoor heat exchanger and a compressor, and the refrigerant branch circuit comprises an energy storage device; 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, wherein the control program for the heat pump system, when executed by the processor, implements the steps of the control method for the heat pump system as described in any one of claims 1 to 9.

11. A storage medium, wherein: 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 9 are implemented.

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