Control methods, devices, and photovoltaic air conditioners

Abstract

This application relates to a control method, apparatus, and photovoltaic air conditioner. The photovoltaic air conditioner is an energy-saving air conditioner, comprising a photovoltaic device, an energy storage device, an air conditioning unit, a control valve assembly, and a cold storage device. The method includes: when the photovoltaic air conditioner is in an off-grid state, acquiring the power generation of the photovoltaic device and the stored energy of the energy storage device; determining the first time from the current time until the next grid connection of the photovoltaic air conditioner and the light intensity information of the outdoor environment where the photovoltaic air conditioner is located during the first time; determining the working mode of the cold storage device, the power supply mode for supplying power to the air conditioning unit, and the operating load of the air conditioning unit based on the power generation, stored energy, first time, and light intensity information; controlling the control valve assembly based on the working mode, controlling the photovoltaic device and the energy storage device based on the power supply mode, and controlling the air conditioning unit based on the operating load. This application achieves an effective balance between the range and comfort of the photovoltaic air conditioner in an off-grid state.

Description

Technical Field

[0001] This application relates to the field of photovoltaic air conditioning technology, and in particular to a control method, device and photovoltaic air conditioner for photovoltaic air conditioning. Background Technology

[0002] With the popularization of photovoltaic energy, photovoltaic air conditioners, as a type of cooling equipment that can utilize renewable energy, are finding increasingly wider applications. To ensure the stable operation of photovoltaic air conditioners in off-grid mode (i.e., when the photovoltaic air conditioner is not connected to the grid), they are typically integrated with energy storage devices (for storing electrical energy) and cold storage devices (for storing cooling capacity) to address the intermittency and instability of power generation from the photovoltaic devices within the photovoltaic air conditioner.

[0003] Currently, when photovoltaic air conditioners are off-grid, the photovoltaic devices in the photovoltaic air conditioner directly power the air conditioning unit, allowing the air conditioning unit to operate at full load. When the photovoltaic devices' power generation is insufficient, the energy storage device powers the air conditioning unit. When the energy storage device's power is insufficient, the cold storage device releases cold energy to ensure the user's cooling needs.

[0004] However, the above methods can easily lead to a situation where the energy storage device has exhausted its power while the cold storage device still has a large amount of cold energy that has not been released. This can cause the air conditioning unit to be unable to meet the user's cooling needs, thereby affecting the user's comfort and making it impossible to achieve an effective balance between the battery life and comfort of photovoltaic air conditioning in off-grid mode. Summary of the Invention

[0005] This application provides a control method, device, and photovoltaic air conditioner to solve the problem that the prior art cannot achieve an effective balance between the range and comfort of photovoltaic air conditioners in off-grid conditions.

[0006] In a first aspect, this application provides a control method for a photovoltaic air conditioner, the photovoltaic air conditioner including a photovoltaic device, an energy storage device, an air conditioning unit, a control valve assembly, and a cold storage device, wherein the photovoltaic device is connected to the energy storage device, the air conditioning unit is connected to both the photovoltaic device and the energy storage device, and the cold storage device is connected to the air conditioning unit via the control valve assembly, the control valve assembly being used to switch the operating mode of the cold storage device; the method includes:

[0007] When the photovoltaic air conditioner is in an off-grid state, the power generation of the photovoltaic device and the stored power of the energy storage device are obtained;

[0008] Determine the first time from the current time to the next grid connection of the photovoltaic air conditioner and the light intensity information of the outdoor environment where the photovoltaic air conditioner is located during the first time;

[0009] Based on the power generation, the stored power, the first duration, and the light intensity information, the operating mode of the cold storage device, the power supply mode for supplying power to the air conditioning unit, and the operating load of the air conditioning unit are determined.

[0010] The control valve assembly is controlled based on the operating mode, the photovoltaic device and the energy storage device are controlled based on the power supply mode, and the air conditioning unit is controlled based on the operating load.

[0011] Secondly, this application provides a control device for a photovoltaic air conditioner, the photovoltaic air conditioner including a photovoltaic device, an energy storage device, an air conditioning unit, a control valve assembly, and a cold storage device. The photovoltaic device is connected to the energy storage device, the air conditioning unit is connected to both the photovoltaic device and the energy storage device, and the cold storage device is connected to the air conditioning unit via the control valve assembly, the control valve assembly being used to switch the operating mode of the cold storage device; the device includes:

[0012] The acquisition module is used to acquire the power generation of the photovoltaic device and the stored power of the energy storage device when the photovoltaic air conditioner is in an off-grid state.

[0013] The determination module is used to determine the first time from the current time to the next grid connection of the photovoltaic air conditioner and the light intensity information of the outdoor environment where the photovoltaic air conditioner is located during the first time.

[0014] The determining module is used to determine the working mode of the cold storage device, the power supply mode for supplying power to the air conditioning unit, and the operating load of the air conditioning unit based on the power generation, the stored power, the first duration, and the light intensity information.

[0015] The control module is used to control the control valve assembly based on the operating mode, control the photovoltaic device and the energy storage device based on the power supply mode, and control the air conditioning unit based on the operating load.

[0016] Thirdly, this application provides a photovoltaic air conditioner, comprising: a processor, a memory, a photovoltaic device, an energy storage device, an air conditioning unit, a control valve assembly, and a cold storage device. The processor is connected to the memory, the photovoltaic device, the air conditioning unit, and the control valve assembly. The photovoltaic device is connected to the energy storage device. The air conditioning unit is connected to both the photovoltaic device and the energy storage device. The cold storage device is connected to the air conditioning unit via the control valve assembly. The control valve assembly is used to switch the operating mode of the cold storage device. The processor is used to execute the control method of the photovoltaic air conditioner as described above.

[0017] Compared with the prior art, the above-mentioned technical solutions provided in this application have the following advantages. The photovoltaic air conditioner control method provided in this application includes a photovoltaic device, an energy storage device, an air conditioning unit, a control valve assembly, and a cold storage device. The photovoltaic device is connected to the energy storage device, the air conditioning unit is connected to both the photovoltaic device and the energy storage device, and the cold storage device is connected to the air conditioning unit through the control valve assembly. The control valve assembly is used to switch the working mode of the cold storage device. The method includes: when the photovoltaic air conditioner is in an off-grid state, acquiring the power generation of the photovoltaic device and the stored power of the energy storage device; determining the first time from the current time to the next grid connection of the photovoltaic air conditioner and the light intensity information of the outdoor environment where the photovoltaic air conditioner is located during the first time; determining the working mode of the cold storage device, the power supply mode for supplying power to the air conditioning unit, and the operating load of the air conditioning unit based on the power generation, stored power, first time, and light intensity information; controlling the control valve assembly based on the working mode, controlling the photovoltaic device and the energy storage device based on the power supply mode, and controlling the air conditioning unit based on the operating load. Through the above methods, this embodiment incorporates a control valve assembly in the photovoltaic air conditioner for switching the operating mode of the cold storage device. Based on the power generation of the photovoltaic device and the stored power of the energy storage device in the off-grid state, and combined with the determined first time of the next grid connection of the photovoltaic device and the outdoor light intensity information of the photovoltaic air conditioner during the first time, it achieves coordinated decision-making on the operating mode of the cold storage device, the power supply mode for the air conditioning unit, and the operating load of the air conditioning unit. By controlling the control valve assembly, the photovoltaic device, the energy storage device, and the air conditioning unit, the cold storage device is in operating mode, the photovoltaic device and the energy storage device supply power to the air conditioning unit in power supply mode, and the air conditioning unit operates at the operating load. This fundamentally solves the problem of the disconnect between energy storage and cold storage capacity in the prior art. While ensuring the cooling comfort of the photovoltaic air conditioner in the off-grid state, it extends the overall runtime of the photovoltaic air conditioner, thereby achieving an effective balance between the runtime and comfort of the photovoltaic air conditioner in the off-grid state. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 This is a schematic diagram of the structure of a photovoltaic air conditioner provided in an embodiment of this application;

[0022] Figure 2 A schematic flowchart illustrating a photovoltaic air conditioner control method provided in an embodiment of this application;

[0023] Figure 3 A schematic flowchart illustrating another photovoltaic air conditioner control method provided in an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structure of a control device for a photovoltaic air conditioner provided in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of another photovoltaic air conditioner provided in an embodiment of this application;

[0026] In the attached diagrams above:

[0027] 101. Photovoltaic device; 102. Energy storage device; 103. Power grid; 104. Processor; 105. Air conditioning unit; 1051. Outdoor unit; 1052. Indoor unit; 106. Control valve assembly; 1061. First control valve; 1062. Second control valve; 107. First throttle valve; 108. Second throttle valve; 109. Cold storage device; 1091. First temperature sensor; 1092. Second temperature sensor; 1093. Third temperature sensor;

[0028] 401. Acquisition Module; 402. Determination Module; 403. Control Module;

[0029] 501. Processor; 502. Communication interface; 503. Storage medium; 504. Communication bus. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0032] refer to Figure 1 , Figure 1 This is a schematic diagram of a photovoltaic air conditioner provided in an embodiment of this application. The photovoltaic air conditioner provided in this embodiment is an energy-saving air conditioner, comprising: a photovoltaic device 101, an energy storage device 102, an air conditioning unit 105, a control valve assembly 106, and a cold storage device 109. The photovoltaic device 101 is connected to the energy storage device 102, and the air conditioning unit 105 is connected to the photovoltaic device 101, the energy storage device 102, and the power grid 103. The cold storage device 109 is connected to the air conditioning unit 105 via the control valve assembly 106. The photovoltaic device 101 converts solar energy into electrical energy to power the air conditioning unit 105. The energy storage device 102 stores the electrical energy generated by the photovoltaic device 101 and powers the air conditioning unit 105. The air conditioning unit 105 regulates the indoor temperature. The control valve assembly 106 switches the operating mode of the cold storage device 109, which stores cooling capacity and releases it to the air conditioning unit 105. The power grid 103 powers the air conditioning unit 105.

[0033] The photovoltaic air conditioner also includes a processor 104, which is connected to the air conditioning unit 105, the power grid 103, the photovoltaic device 101, the energy storage device 102, the cold storage device 109 and the control valve assembly 106, respectively, and is used to coordinate and control the operating status of the above components.

[0034] In this embodiment, a control valve assembly 106 is provided to control the cold storage device 109 after determining its operating mode, thereby causing the cold storage device 109 to operate in the corresponding operating mode. The control valve assembly 106 includes a first control valve 1061 and a second control valve 1062. The air conditioning unit 105 includes an indoor unit 1052 and an outdoor unit 1051. The outdoor unit 1051, the cold storage device 109, and the first control valve 1061 are sequentially connected to form a cold storage circuit. The outdoor unit 1051, the cold storage device 109, the second control valve 1062, and the indoor unit 1052 are sequentially connected to form a cold release circuit. The first control valve 1061 and the second control valve 1062 can be solenoid valves. The specific forms of the first control valve 1061 and the second control valve 1062 can be selected according to actual needs, and are not limited in this embodiment.

[0035] Specifically, when the working mode of the cold storage device 109 is determined to be the cold storage mode, the first control valve 1061 is opened and the second control valve 1062 is closed, so that the cold storage circuit is connected and the cold release circuit is turned off. At this time, the cold storage device 109 is in the cold storage mode, so that in the cold storage circuit, the high-pressure medium-temperature liquid refrigerant discharged from the outdoor unit 1051 flows into the cold storage equipment for evaporation and heat absorption to store cold energy. The low-pressure gaseous refrigerant flowing out of the cold storage equipment flows into the outdoor unit 1051 after throttling and pressure reduction to complete the cycle. When the working mode of the cold storage device 109 is determined to be the cold release mode, the first control valve 1061 is closed and the second control valve 1062 is opened, so that the cold storage circuit is shut off and the cold release circuit is connected. At this time, the cold storage device 109 is in the cold release mode. Thus, in the cold release circuit, the high-pressure medium-temperature liquid refrigerant discharged from the outdoor unit 1051 flows into the cold storage device 109 after being throttled and depressurized. The liquid refrigerant absorbs cold energy and continues to evaporate in the cold storage device 109 to become low-pressure gaseous refrigerant. Thus, carrying the cold energy, it flows into the indoor unit 1052 through the second control valve 1062, so that the indoor unit 1052 releases cold energy to the indoor environment. After the indoor unit 1052 releases cold energy, the low-pressure gaseous refrigerant flows into the outdoor unit 1051 to complete the cycle. When the cold storage device 109 is in idle mode, both the first control valve 1061 and the second control valve 1062 are closed, thus shutting off both the cold storage circuit and the cold release circuit. At this time, the cold storage device 109 is in idle mode. When the indoor unit 1052 has a cooling demand, it can directly release cooling capacity into the indoor environment through the air conditioning unit 105. This embodiment, by setting the first control valve 1061 and the second control valve 1062, achieves reliable switching between the three modes of the cold storage device 109, ensuring that the cold storage device 109 can perform optimally under various operating conditions.

[0036] In this embodiment, the photovoltaic air conditioner also includes a first throttling valve 107. One end of the first throttling valve 107 is connected to the outdoor unit 1051, and the other end is connected to the cold storage device 109. The first throttling valve 107 can be an electronic expansion valve, and its specific form can be selected according to actual needs. The first throttling valve 107 is used to throttle and reduce the pressure of the high-temperature, medium-pressure liquid refrigerant flowing out of the outdoor unit 1051 and to regulate the refrigerant flow rate into the cold storage device 109. By setting the first throttling valve 107, the cold storage flow rate can be adjusted by adjusting the opening of the first throttling valve 107 when the cold storage device 109 is in cold storage mode, and the cold release flow rate can be adjusted by adjusting the opening of the first throttling valve 107 when the cold storage device 109 is in cold release mode, thereby ensuring cold storage efficiency and user comfort, and thus achieving an optimized balance of photovoltaic air conditioner performance.

[0037] In this embodiment, the photovoltaic air conditioner also includes a second throttle valve 108. One end of the second throttle valve 108 is connected to the outdoor unit 1051, and the other end is connected to the indoor unit 1052. The second throttle valve 108 is used to regulate the flow rate of refrigerant from the outdoor unit 1051 to the indoor unit 1052. The second throttle valve 108 can be an electronic expansion valve, and its specific form can be selected according to actual needs. By setting the second throttle valve 108, the refrigerant flow rate can be regulated by adjusting the opening of the second throttle valve 108 when the refrigerant flows from the outdoor unit 1051 to the indoor unit 1052, thereby improving the accuracy of indoor temperature control and optimizing energy utilization efficiency while ensuring comfort.

[0038] In this embodiment, a first temperature sensor 1091 is installed at the refrigerant inlet pipe of the cold storage device 109, and a second temperature sensor 1092 is installed at the refrigerant outlet pipe of the cold storage device 109. The first temperature sensor 1091 and the second temperature sensor 1092 can be selected according to actual needs, and their types are not limited in this embodiment. When the cold storage device 109 is in cold storage mode, the temperature of the refrigerant at the refrigerant inlet pipe can be obtained through the first temperature sensor 1091, and the temperature of the refrigerant at the refrigerant outlet pipe can be obtained through the second temperature sensor 1092. Based on the temperatures of the refrigerant at the refrigerant inlet pipe and the refrigerant at the refrigerant outlet pipe, the superheat of the cold storage device 109 can be determined, and then the opening of the first throttle valve 107 can be adjusted based on the superheat. The superheat is equal to the difference between the temperature of the first temperature sensor 1091 and the temperature of the second temperature sensor 1092. By setting the first temperature sensor 1091 and the second temperature sensor 1092, the opening of the first throttle valve 107 can be adjusted, thereby adjusting the cooling rate and ensuring cooling efficiency and user comfort.

[0039] In this embodiment, a third temperature sensor 1093 is provided in the cold storage device 109. The third temperature sensor 1093 can be selected according to actual needs, and its type is not limited in this embodiment. The third temperature sensor 1093 is used to obtain the refrigerant temperature in the cold storage device 109. When the refrigerant temperature reaches a preset temperature threshold and the duration is longer than a preset duration, the cold storage device 109 is determined to have completed cold storage. After the cold storage is completed, the first control valve 1061 and the first throttle valve 107 can be closed to avoid refrigerant waste and improve refrigerant utilization. The preset temperature threshold and preset duration can be set according to actual needs. The specific values ​​of the preset temperature threshold and preset duration are not limited in this embodiment.

[0040] refer to Figure 2 , Figure 2 This is a flowchart illustrating a control method for a photovoltaic air conditioner provided in an embodiment of this application. The control method for a photovoltaic air conditioner provided in this application includes the following steps:

[0041] S201: When the photovoltaic air conditioner is in an off-grid state, obtain the power generation of the photovoltaic device and the stored power of the energy storage device.

[0042] In this embodiment, the method is applied to the processor in the photovoltaic air conditioner described above. The photovoltaic air conditioner being in an off-grid state can be understood as the photovoltaic air conditioner not being connected to the power grid, and the air conditioning unit being powered solely by the photovoltaic device, the energy storage device, or both. The methods for obtaining the power generation of the photovoltaic device and the stored energy of the energy storage device can refer to existing technologies, and will not be elaborated upon in this embodiment. Stored energy is also understood as the current energy state of the energy storage device.

[0043] In the case of photovoltaic air conditioners being off-grid, directly controlling the air conditioning unit, photovoltaic device, energy storage device, and cold storage device in the photovoltaic air conditioner by obtaining the power generation of the photovoltaic device and the stored power of the energy storage device will cause an imbalance between range and user comfort. Therefore, in order to avoid the above problems, this embodiment obtains the first duration and light intensity information through the following S202. Based on the obtained power generation and stored power, the control strategy between the air conditioning unit, photovoltaic device, energy storage device, and cold storage device is collaboratively decided by combining the first duration and light intensity information. Control is then carried out according to the control strategy to achieve a balance between range and user comfort.

[0044] S202: Determine the first time from now until the next grid connection of the photovoltaic air conditioner, and the information on the light intensity of the outdoor environment where the photovoltaic air conditioner is located during the first time.

[0045] In this embodiment, the next grid connection can be understood as the photovoltaic air conditioner being connected to the grid after a period of time, even though it is not currently connected. The first duration can be understood as the total duration for which the photovoltaic air conditioner remains off-grid from the current time. This first duration can be set by the user or predicted, and the light intensity information can be predicted. When predicting the first duration, a pre-trained first prediction model, the reason for the photovoltaic air conditioner's current grid disconnection, and the current grid disconnection time can be obtained. The reason for the grid disconnection and the disconnection time are input into the first prediction model, so that the first prediction model outputs the first duration from the current time until the next grid connection of the photovoltaic air conditioner. When predicting the light intensity information, a pre-trained second prediction model can be obtained, along with the location information of the photovoltaic air conditioner and the season of the outdoor environment where the photovoltaic air conditioner is located. Based on the location information and season, historical weather information for various preset time periods of the same location information and season, as well as real-time weather information of the outdoor environment where the air conditioner is located, are obtained. The historical weather information and real-time weather information are input into the second prediction model, so that the second prediction model outputs the light intensity information of the outdoor environment where the photovoltaic air conditioner is located within the first duration. The preset time period is the same time period from the present to the next grid connection in the past.

[0046] S203: Based on the power generation capacity, stored power, first duration and light intensity information, determine the working mode of the cold storage device, the power supply mode for the air conditioning unit, and the operating load of the air conditioning unit.

[0047] In this embodiment, after obtaining information on power generation, stored energy, first duration, and irradiance, multi-parameter fusion decision-making is performed using the power generation, stored energy, first duration, and irradiance information to determine the optimal operating mode of the cold storage device, the optimal power supply mode for supplying power to the air conditioning unit, and the optimal operating load for the air conditioning unit, which balances the off-grid endurance of the photovoltaic air conditioner with user comfort. Thus, when control is performed based on the determined operating mode, power supply mode, and operating load, a balance between the off-grid endurance of the photovoltaic air conditioner and user comfort is achieved.

[0048] The operating modes of the cold storage device include cold storage mode, cold release mode, and idle mode. The power supply modes include Mode 1, Mode 2, Mode 3, and Mode 4. Mode 1 represents the energy storage device supplying power to the air conditioning unit alone; Mode 2 represents the photovoltaic device and energy storage device jointly supplying power to the air conditioning unit; Mode 3 represents the photovoltaic device supplying power to the air conditioning unit alone but not storing energy in the energy storage device; and Mode 4 represents the photovoltaic device supplying power to the air conditioning unit alone and storing energy in the energy storage device.

[0049] In this embodiment, after obtaining the working mode, the control method for a photovoltaic air conditioner provided in this embodiment further includes the following steps:

[0050] When the working mode is cold storage mode, the first temperature of the indoor environment where the indoor unit is located and the first superheat of the cold storage device are obtained.

[0051] The opening degree of the first throttle valve is controlled based on the first superheat.

[0052] During the process of controlling the opening of the first throttle valve based on the first superheat, the second temperature of the indoor environment where the indoor unit is located is obtained;

[0053] When the difference between the first temperature and the second temperature is less than the first temperature threshold, the opening of the first throttle valve is reduced.

[0054] When the working mode is the cooling release mode, the opening degree of the first throttle valve is controlled based on the first preset opening degree;

[0055] When the working mode is idle mode, the opening degree of the first throttle valve is controlled based on the second preset opening degree.

[0056] In this embodiment, the first preset opening degree is the maximum opening degree of the first throttle valve, and the second preset opening degree is the minimum opening degree of the first throttle valve. The maximum opening degree can be understood as fully open, and the minimum opening degree can be understood as fully closed. When the working mode is the cold storage mode, in order to improve user comfort and cold storage efficiency, the first temperature of the indoor environment where the indoor unit is located and the first superheat of the cold storage device (the method for determining the superheat can be referred to above) are obtained. The opening degree of the first throttle valve is controlled by the first superheat to ensure that the cold storage device operates in a high-efficiency heat exchange state and avoids the decrease in cold storage efficiency caused by insufficient or excessive refrigerant flow. The correspondence between superheat and opening degree can be preset, so that after obtaining the first superheat, the corresponding relationship can be queried using the first superheat to obtain the required opening degree of the first throttle valve. Furthermore, during the process of controlling the opening of the first throttle valve based on the first superheat, the second temperature of the indoor environment where the indoor unit is located is obtained, and the absolute difference between the first temperature and the second temperature is determined. When the absolute difference is less than the first temperature threshold, it indicates that the indoor environment is poorly cooled due to the cold storage device. Therefore, in order to improve user comfort, the opening of the first throttle valve can be reduced. In the cooling release mode, the opening of the first throttle valve can be controlled to the maximum opening of the first throttle valve (i.e., the first preset opening) to maximize the cold release rate, quickly reduce the indoor temperature, and improve user comfort. In the idle mode, the opening of the first throttle valve is controlled to the minimum opening of the first throttle valve (i.e., the second preset opening) to minimize ineffective energy consumption, thereby protecting the cold storage device. Through the above methods, this embodiment improves the cold storage efficiency and user comfort in the cold storage mode, shortens the rapid cooling response time in the cooling release mode, and reduces ineffective energy consumption in the idle mode by finely controlling the opening of the first throttle valve in different modes, achieving an optimal balance between cold storage efficiency, cooling release speed, and energy consumption.

[0057] It should be noted that a temperature sensor can be installed at the air outlet of the indoor unit to obtain the temperature of the indoor environment where the indoor unit is located.

[0058] S204: Control valve assembly based on working mode, photovoltaic device and energy storage device based on power supply mode, and air conditioning unit based on operating load.

[0059] In this embodiment, after obtaining the power supply mode, energy can be allocated to the photovoltaic device and the energy storage device based on the power supply mode to ensure battery life. After obtaining the operating mode, the on / off state of the control valve assembly corresponding to the operating mode can be determined based on the operating mode, thereby controlling the control valve assembly based on the on / off state of the control valve assembly so that the energy storage device operates in the determined operating mode (refer to the above method of controlling the control valve assembly based on the operating mode). When the operating load is obtained, the air conditioning unit can be controlled to operate at the operating load, thereby utilizing the operating load and the operating mode to achieve on-demand distribution of cooling capacity with allocated energy to ensure user comfort, thus achieving an effective balance between battery life and user comfort.

[0060] In the above-described step S204, when controlling the control valve assembly, photovoltaic device, energy storage device, and air conditioning unit, the photovoltaic air conditioning control method provided in this embodiment further includes the following steps:

[0061] The opening degree of the second throttle valve is controlled based on the third preset opening degree;

[0062] During the process of controlling the opening of the second throttle valve based on the third preset opening degree, the third temperature of the indoor environment where the indoor unit is located and the target set temperature of the indoor environment where the indoor unit is located are obtained.

[0063] When the difference between the third temperature and the target set temperature is less than the second temperature threshold, the opening of the second throttle valve is reduced.

[0064] In this design, the third preset opening degree is the maximum opening degree of the second throttle valve, which can be understood as fully open. The opening degree of the second throttle valve is set to its maximum opening degree (i.e., the third preset opening degree) by default to enable rapid cooling. During the process of controlling the opening degree of the second throttle valve based on the third preset opening degree, in order to achieve precise control of the indoor ambient temperature and ensure user comfort, the third temperature of the indoor environment where the indoor unit is located and the target set temperature of the indoor environment set by the user are acquired. The absolute difference between the third temperature and the target set temperature is determined. When the absolute difference is less than the second temperature threshold, the opening degree of the second throttle valve is reduced. Through the above methods, this embodiment enables rapid cooling of the indoor temperature and reduces temperature fluctuations.

[0065] This embodiment provides a control method for a photovoltaic air conditioner. The photovoltaic air conditioner includes a control valve assembly for switching the operating mode of a cold storage device. Based on the power generation of the photovoltaic device and the stored energy of the energy storage device in the off-grid state, and combined with the determined first time interval of the next grid connection of the photovoltaic device and the outdoor light intensity information of the photovoltaic air conditioner during that first time interval, the method achieves coordinated decision-making regarding the operating mode of the cold storage device, the power supply mode for the air conditioning unit, and the operating load of the air conditioning unit. By controlling the control valve assembly, the photovoltaic device, the energy storage device, and the air conditioning unit, the method ensures that the cold storage device is in operating mode, the photovoltaic device and energy storage device supply power to the air conditioning unit in power supply mode, and the air conditioning unit operates at its operating load. This fundamentally solves the problem of the disconnect between energy storage and cold storage capacity in existing technologies. While ensuring the cooling comfort of the photovoltaic air conditioner in the off-grid state, it extends the overall runtime of the photovoltaic air conditioner, thus achieving an effective balance between runtime and comfort in the off-grid state.

[0066] refer to Figure 3 , Figure 3 This is a flowchart illustrating another photovoltaic air conditioner control method provided in an embodiment of this application. The photovoltaic air conditioner control method provided in this application includes the following steps:

[0067] S301: When the photovoltaic air conditioner is in an off-grid state, obtain the power generation of the photovoltaic device and the stored power of the energy storage device.

[0068] S302: Determine the first time from now until the next grid connection of the photovoltaic air conditioner, and the information on the light intensity of the outdoor environment where the photovoltaic air conditioner is located during the first time.

[0069] Regarding steps S301 and S302, step S301 is the same as step S201, and step S302 is the same as step S202. For details, please refer to the description of steps S201 and S202. In this embodiment, they will not be repeated here.

[0070] It should be noted that the offline status is determined in the following way:

[0071] Obtain the connection status between the photovoltaic device and the power grid;

[0072] When the connection status is "not connected", it is determined that the photovoltaic air conditioner is in an off-grid state.

[0073] The connection status can be determined by a grid interface sensor (such as a voltage sensor). If no grid voltage is detected, the connection status is not connected, and the photovoltaic air conditioner is determined to be in an off-grid state. If grid voltage is detected, the connection status is connected, and the photovoltaic air conditioner is determined to be in a grid-connected state.

[0074] In this embodiment, after performing the step of obtaining the connection status between the photovoltaic device and the power grid, the photovoltaic air conditioner control method provided in this embodiment further includes the following steps:

[0075] When the connection status is "connected", it is determined that the photovoltaic air conditioner is in grid-connected state;

[0076] When the photovoltaic air conditioner is in grid-connected state, if the indoor unit has a cooling demand, the first operating load of the air conditioning unit is obtained, and the working mode of the cold storage device is determined to be the cold storage mode.

[0077] Based on the cold storage mode, the first control valve is opened and the second control valve is closed so that the cold storage device is in the cold storage mode. Based on the first operating load, the air conditioning unit is controlled. Based on the cold storage mode, the first temperature of the indoor environment where the indoor unit is located and the first superheat of the cold storage device are obtained to control the opening of the first throttle valve. The second throttle valve is controlled based on the third preset opening to control the opening of the second throttle valve.

[0078] The cooling demand of the indoor unit can be understood as the user turning on the air conditioning unit and activating its cooling mode. The first operating load is as described above and will not be repeated in this embodiment. Since the photovoltaic air conditioner has sufficient power when connected to the grid, the air conditioning unit can operate at full load (i.e., the first operating load). Furthermore, to ensure user comfort during off-grid periods, the cold storage device's operating mode is determined to be cold storage mode when the photovoltaic air conditioner is connected to the grid. The control valve assembly is then controlled according to this cold storage mode to keep the cold storage device in cold storage mode. While controlling the air conditioning unit and the control valve assembly, the first throttle valve can be controlled according to the control method described above for the first throttle valve in cold storage mode, and the second throttle valve can be controlled according to the control method described above for the second throttle valve to control the cold storage speed and room temperature adjustment speed. This will not be further elaborated in this embodiment. Through the above methods, this embodiment, when connected to the grid and the indoor unit has a cooling demand, controls the air conditioner to operate at maximum load, synchronously stores cold energy through the cold storage device, and finely adjusts the throttling valve. This not only quickly meets the indoor cooling demand and ensures comfort, but also efficiently stores cold energy to improve energy utilization, achieving synergistic optimization of instant cooling and cold energy storage.

[0079] It should be noted that when photovoltaic air conditioners are connected to the grid, the energy distribution among the grid, photovoltaic devices, and energy storage devices can refer to existing technologies, which will not be elaborated here. Furthermore, after the cold storage device has completed cold storage, the operating load of the air conditioning unit can be controlled to reduce unnecessary energy waste.

[0080] In this embodiment, before performing the first operating load acquisition step of the air conditioning unit, the photovoltaic air conditioning control method provided in this embodiment further includes the following steps:

[0081] Determine if the indoor unit requires cooling.

[0082] After determining whether the indoor unit has a cooling requirement, the photovoltaic air conditioner control method provided in this embodiment further includes the following steps:

[0083] If the indoor unit has a cooling demand, perform the above steps to obtain the first operating load of the air conditioning unit.

[0084] If the indoor unit has no cooling demand, obtain the second superheat of the cold storage device and the second operating load of the outdoor unit, and determine the working mode of the cold storage device as the cold storage mode;

[0085] The system controls the opening of the first control valve and the closing of the second control valve based on the cold storage mode, so that the cold storage device is in the cold storage mode. The outdoor unit is controlled based on the second operating load, the opening degree of the first throttle valve is controlled based on the second superheat, and the opening degree of the second throttle valve is controlled based on the fourth preset opening degree.

[0086] The second operating load is the maximum operating load of the outdoor unit, and the fourth preset opening is the minimum opening of the second throttle valve, which can be understood as fully closed. If the indoor unit has cooling requirements, refer to the above description. No cooling requirement for the indoor unit can be understood as no need to cool the indoor environment, i.e., no need to turn on the indoor unit. If the indoor unit does not have cooling requirements, a stable power supply can be fully utilized to enable the cold storage device to store cold (i.e., the cold storage device operates in cold storage mode). To maximize the cold storage speed of the cold storage device, the outdoor unit can be controlled to operate at its maximum operating load (i.e., the second operating load). Furthermore, when controlling the first and second control valves to put the cold storage device in cold storage mode, the second superheat of the cold storage device can be obtained (refer to the method for obtaining the first superheat). This second superheat is used to control the first throttle valve, ensuring that the cold storage device operates in a highly efficient heat exchange state and avoiding a decrease in cold storage efficiency due to insufficient or excessive refrigerant flow. Simultaneously, the opening degree of the second throttle valve is controlled to the fourth preset opening degree, so that when there is no indoor cooling demand, the refrigerant circulation on the indoor unit side is cut off by the minimum opening degree, avoiding the ineffective consumption of cooling capacity caused by refrigerant entering the indoor unit. Through the above methods, this embodiment achieves improved cold storage efficiency and reduced ineffective energy consumption when connected to the grid and there is no indoor unit cooling demand, through full-force cold storage and precise control of the throttle valve.

[0087] S303: When the power generation is less than or equal to the preset power threshold, determine the first operating power required for the operation of the air conditioning unit, the power supply mode for supplying power to the air conditioning unit as the first mode, and the working mode of the cold storage mode as the cold release mode.

[0088] S304: Based on the photovoltaic intensity information, the first duration, and the stored energy, determine the second operating power that can supply power to the air conditioning unit in the first mode.

[0089] S305: Determine the operating load of the air conditioning unit based on the first operating power and the second operating power.

[0090] Regarding steps S303 to S305 above, the preset power threshold is used to characterize the power threshold at which the photovoltaic device can generate electricity. The preset power threshold is a value close to 0, for example, the preset power threshold can be 0.5KW. The preset power threshold can be set according to actual needs, and the specific value of the preset power threshold is not limited in this embodiment.

[0091] The first operating power can be understood as the operating power required for the air conditioning unit to operate under current environmental conditions to meet the user's set temperature requirements. The determination method for the first operating power can refer to existing technologies, and will not be elaborated upon in this embodiment. When the power generation is less than or equal to a preset power threshold, it indicates that the photovoltaic device has no power generation capacity, meaning that the photovoltaic device cannot supply power to the air conditioning unit. At this time, an energy storage device is needed to supply power to the air conditioning unit, and the power supply mode for supplying power to the air conditioning unit is designated as the first mode. Furthermore, to improve the endurance of the energy storage device, the operating mode of the cold storage device is determined to be the cold release mode. When controlling the air conditioning unit, the cold storage device releases the stored cold energy to the indoor unit of the air conditioning unit to assist the air conditioning unit in cooling and reduce the energy consumption of the photovoltaic air conditioning. In addition, to ensure user comfort with limited energy, a second operating power is determined for the air conditioning unit currently powered by the first mode. When determining the second operating power, the first grid connection time of the photovoltaic air conditioning and the light intensity information of the outdoor environment where the air conditioning unit will be located are considered to obtain a more accurate and reliable second operating power. After obtaining the first and second operating power, the first and second operating power are compared to determine the final operating load of the air conditioning unit. This achieves intelligent optimization of the air conditioning unit's operating load, ensuring both the battery life of the photovoltaic air conditioner and user comfort. In this embodiment, by assessing the power generation capacity of the photovoltaic device, and supplementing cooling capacity through energy storage to reduce energy consumption when the photovoltaic device's power generation capacity is insufficient, as well as intelligently optimizing the operating load available for air conditioning operation, both the battery life of the photovoltaic air conditioner during off-grid periods and user comfort are guaranteed.

[0092] In step S304 above, based on photovoltaic intensity information, the first duration, and stored energy, the second operating power available for the air conditioning unit to operate in the first mode is determined, including:

[0093] Based on the light intensity information, determine the second time required for the photovoltaic device to generate electricity so that the air conditioning unit can operate at the first operating power from the present moment;

[0094] The minimum first target duration is determined from the first duration and the second duration;

[0095] Based on the stored energy and the first target duration, a second operating power is determined that can supply power to the air conditioning unit in the first mode.

[0096] In this embodiment, the second duration can be understood as how long it will take for the air conditioning unit to continue operating under the first mode. After obtaining the second duration, the first duration is compared with the second duration to determine the minimum first target duration from the first and second durations. For example, if the first duration is 30 minutes and the second duration is 40 minutes, the first target duration is 30 minutes. This minimum first target duration is used to characterize the minimum duration that the energy storage device can sustain supplying power to the air conditioning unit alone. After determining the first target duration, the final second operating power available for the air conditioning unit to operate under the first mode can be determined based on the stored energy and the first target duration, as follows:

[0097] W2=(Q 1× 90%) / T1

[0098] In the above, W2 represents the second operating power, Q1 represents the stored energy, and T1 represents the first target duration.

[0099] In this embodiment, when determining the second duration based on the light intensity information, a pre-trained third prediction model can be obtained. The light intensity information is input into the third prediction model, which then outputs the power generation corresponding to each future time point. Starting from the minimum future time point, the first power generation exceeding the first operating power is determined. Subtracting the current time from the future time point corresponding to this power generation yields the second duration. It should be noted that the light intensity information includes the light intensity at each future time point. By determining the second operating power in this way, while ensuring user comfort, the discharge duration of the energy storage device is precisely matched to the actual needs during off-grid operation, avoiding over-discharge and thus ensuring the stable operation of the photovoltaic air conditioner during off-grid periods.

[0100] In step S305 above, determining the operating load of the air conditioning unit based on the first operating power and the second operating power includes:

[0101] When the first operating power is less than or equal to the second operating power, the operating load of the air conditioning unit is determined based on the first operating power;

[0102] When the first operating power is greater than the second operating power, the operating load of the air conditioning unit is determined based on the second operating power.

[0103] In this embodiment, after obtaining the first operating power and the second operating power, the first operating power is compared with the second operating power. When the first operating power is less than or equal to the second operating power, it indicates that the actual demand is less than the actual supply. At this time, the operating load of the air conditioning unit can be determined based on the first operating power, and the air conditioning unit can be controlled to operate at the determined operating load. The method for determining the operating load can refer to the prior art, and will not be elaborated here. When the first operating power is greater than the second operating power, it indicates that the actual demand is greater than the actual supply. In order to ensure the battery life of the photovoltaic air conditioner, while ensuring user comfort as much as possible, the operating load of the air conditioning unit is determined based on the second operating power, and the air conditioning unit can be controlled to operate at the determined operating load. Through the above method, this embodiment achieves dynamic matching between actual demand and actual supply by comparing the first operating power and the second operating power, balancing user comfort and stable battery life of the photovoltaic air conditioner in off-grid scenarios, and avoiding insufficient battery life due to forcibly meeting demand or poor comfort due to excessive load reduction.

[0104] S306: When the power generation is greater than the preset power threshold, obtain the first operating load of the air conditioning unit.

[0105] S307: When the power generation capacity meets the requirements of the air conditioning unit operating at the first operating load, the operating load of the air conditioning unit is determined as the first operating load, and the working mode of the cold storage device and the power supply mode of the air conditioning unit are determined according to the stored power and the first duration.

[0106] S308: When the power generation capacity does not meet the requirements of the air conditioning unit operating at the first operating load, the power supply mode for supplying power to the air conditioning unit is determined to be the second mode and the working mode of the cold storage device is the cold release mode.

[0107] S309: Based on the power generation capacity, light intensity information, first duration and stored energy, determine the fourth operating power that can supply power to the air conditioning unit in the second mode;

[0108] S310: Determine the operating load of the air conditioning unit based on the fourth operating power.

[0109] Regarding steps S206 to S310 above, the first operating load is the maximum operating load of the air conditioning unit. When the power generation exceeds a preset power threshold, it indicates that the photovoltaic device has power generation capability (i.e., the photovoltaic device can supply power to the air conditioning unit). At this time, it is necessary to obtain the first operating load of the air conditioning unit to determine the power generation capability of the photovoltaic device. The first operating load is set before the air conditioning unit leaves the factory and is stored in the air conditioning unit. When the first operating load is needed, it can be obtained from the air conditioning unit. The first operating load represents the maximum cooling capacity of the air conditioning unit and is the benchmark for determining whether the power generation of the photovoltaic device can independently support the full-load operation of the air conditioning unit. After obtaining the first operating load, the power generation is compared with the first operating load. If the power generation is sufficient for the air conditioning unit to operate at the first operating load, then, in order to achieve rapid cooling of the indoor environment, the operating load of the air conditioning unit is determined as the first operating load (i.e., the air conditioning unit is subsequently controlled to operate at the first operating load). At the same time, based on the stored electricity and the first duration, the working mode of the cold storage device and the power supply mode for supplying power to the air conditioning unit are determined.

[0110] If the power generation is less than the first operating load, it indicates that the power generation is insufficient to allow the air conditioning unit to operate at the first operating load. In this case, energy storage devices are needed to provide power, and the power supply mode for the air conditioning unit is determined to be the second mode (i.e., photovoltaic devices and energy storage devices jointly supply power to the air conditioning unit). Simultaneously, the operating mode of the cold storage device is determined to be the cold release mode, releasing energy through the cold storage device to ensure current cooling needs while maintaining operational continuity. When the power generation is greater than or equal to the first operating load, in order to determine the fourth operating power available for the air conditioning unit to operate under the second power supply mode, the first duration of the future photovoltaic air conditioning grid connection and the future outdoor light intensity information of the air conditioning unit are considered to obtain a more accurate and reliable fourth operating power. Based on the fourth operating power, the operating load of the air conditioning unit is determined, and the air conditioning unit is then controlled to operate at the determined operating load. In this embodiment, starting with photovoltaic power, a branch decision is made by determining whether the photovoltaic power can meet the full-load operation of the air conditioning unit. If the photovoltaic power can meet the full-load operation of the air conditioning unit, the cold storage and charging are optimized. If the photovoltaic power cannot meet the full-load operation of the air conditioning unit, the photovoltaic power is maximized through hybrid power supply. This allows for efficient use of photovoltaic power while ensuring user comfort during the off-grid operation of the photovoltaic air conditioning system, and also extends the energy storage range. This solves the problems of energy waste or poor user comfort caused by traditional control methods.

[0111] In step S307 above, the operating mode of the cold storage device and the power supply mode for the air conditioning unit are determined based on the stored energy and the first duration, specifically including:

[0112] When the stored power is greater than or equal to the preset power threshold, or when the stored power is less than the preset power threshold and the first duration is less than the preset duration threshold, the working mode of the cold storage device is determined to be the cold storage mode and the power supply mode for the air conditioning unit is determined to be the third mode.

[0113] When the stored power is less than the preset power threshold and the first duration is greater than or equal to the preset duration threshold, the working mode of the cold storage device is determined to be idle mode and the power supply mode for the air conditioning unit is determined to be the fourth mode.

[0114] In this embodiment, the preset power threshold and preset duration threshold can be set according to actual needs. The specific values ​​of the preset power threshold and preset duration threshold are not limited in this embodiment. For example, the preset power threshold can be 90%, and the preset duration threshold can be 2 hours. When the stored power is greater than or equal to the preset power threshold, it indicates that the energy storage device has sufficient power, and the photovoltaic device has a high power generation capacity. At this time, priority can be given to storing cold energy for the cold storage device (i.e., the working mode of the cold storage device is determined to be the cold storage mode), and only the photovoltaic device can be used to power the air conditioning unit (i.e., the power supply mode for the air conditioning unit is the third mode). When the stored power is less than the preset power threshold and the first duration is less than the preset duration threshold, although the stored power of the energy storage device is slightly lower, the photovoltaic air conditioning will quickly connect to the grid. Therefore, the photovoltaic device does not need to store power for the energy storage device, and the power generation of the photovoltaic device can be fully utilized to enable the cold storage device to store cold energy (i.e., the working mode of the cold storage device is determined to be the cold storage mode) and power the air conditioning unit (i.e., the power supply mode for the air conditioning unit is the third mode), thereby improving user comfort. When the stored energy is less than a preset energy threshold and the first duration is greater than or equal to a preset duration threshold, not only is the stored energy of the energy storage device low, but the photovoltaic air conditioner is also connected to the grid for a long time. Therefore, to avoid unexpected situations that could prevent the air conditioning unit from cooling, the working mode of the cold storage device is determined to be the idle mode (i.e., neither storing nor releasing cold). At the same time, when the photovoltaic device is used to supply power to the air conditioning unit, the remaining power generation capacity of the photovoltaic device is used for energy storage (i.e., the power supply mode for the air conditioning unit is the fourth mode). Through the above methods, in this embodiment, during the off-grid period of the photovoltaic air conditioner, if the photovoltaic device generates sufficient power, by balancing the priority of cold storage, the optimal allocation of cold energy reserve and power supply during the off-grid period is achieved to ensure the reliable operation of the subsequent air conditioning unit.

[0115] Specifically, the aforementioned preset duration threshold can be determined as follows:

[0116] Obtain the initial duration threshold;

[0117] Based on light intensity information, determine the duration of a target under stable lighting conditions;

[0118] The initial duration threshold is adjusted according to the target duration to obtain the preset duration threshold.

[0119] The initial duration threshold can be set according to actual needs, and this embodiment does not impose any limitations on it. When the target duration is long, the initial duration threshold can be increased; when the target duration is short, the initial duration threshold can be decreased. By using light intensity information to determine the final preset duration threshold, it is possible to better balance the priorities of cold storage and avoid subsequent power shortages due to insufficient light.

[0120] In step S309 above, based on the power generation capacity, irradiance information, first duration, and stored energy, the fourth operating power that can supply power to the air conditioning unit in the second mode is determined, specifically including:

[0121] Based on the light intensity information, determine the third time interval from now until the photovoltaic device generates electricity so that the air conditioning unit can operate at power generation capacity;

[0122] The minimum second target duration is determined from the first duration and the third duration;

[0123] Based on the stored energy and the second target duration, determine the fifth operating power that the energy storage device can supply to the air conditioning unit.

[0124] Based on the power generation capacity and the fifth operating capacity, the fourth operating capacity that can be used to power the air conditioning units in the second mode is determined.

[0125] In this embodiment, the method for determining the third duration is similar to that for determining the second duration described above. For details, please refer to the method for determining the second duration described above; further elaboration is not provided here. The third duration can be understood as how long it takes to supply power to the air conditioning unit in the second mode. After obtaining the third duration, the first duration is compared with the third duration to determine the minimum second target duration (refer to an example of the first target duration). This minimum second target duration characterizes the minimum duration that can be sustained when the photovoltaic device and energy storage device jointly supply power to the air conditioning unit. After determining the second target duration, based on the stored electricity and the second target duration, the second operating power that the energy storage device can supply to operate the air conditioning unit can be determined. Adding the generated power to the fifth operating power yields the final fourth operating power that can supply power to the air conditioning unit in the second mode. By determining the fourth operating power in this embodiment, the energy storage device is prevented from over-discharging due to the decrease in the power generation of the photovoltaic device, thus ensuring the basic power supply capacity in the later stages of off-grid operation. At the same time, the power generation of the photovoltaic device is fully utilized to reduce energy waste, and a dynamic balance is achieved between meeting cooling needs and ensuring full-range off-grid operation.

[0126] The fourth operating power can be expressed by the following formula:

[0127] W4 = W1 + (Q) 1× 90%) / T2

[0128] In the above formula, W4 represents the fourth operating power, W1 represents the power generation, Q1 represents the stored electricity, and T2 represents the second target duration.

[0129] The above method of determining the fourth operating power not only avoids excessive discharge of the energy storage device due to a sudden drop in photovoltaic power, thus ensuring the basic power supply capacity in the later stages of off-grid operation, but also fully utilizes the photovoltaic power generation to reduce energy waste. At the same time, it achieves a dynamic balance between meeting current cooling needs and ensuring full-range off-grid operation, effectively improving the operational stability and user comfort of photovoltaic air conditioners in scenarios with insufficient off-grid power generation.

[0130] S311: Control valve assembly based on working mode, photovoltaic device and energy storage device based on power supply mode, and air conditioning unit based on operating load.

[0131] The control method for the control valve assembly based on the working mode and the control of the air conditioning unit based on the operating load in this embodiment can be referred to the above description, and will not be repeated here.

[0132] Control of photovoltaic devices and energy storage devices based on power supply mode includes:

[0133] When the power supply mode is the first mode, the photovoltaic device is controlled to not work and the energy storage device is controlled to work so that the energy storage device can supply power to the air conditioning unit.

[0134] When the power supply mode is the second mode, control the photovoltaic device and the energy storage device to work so that the photovoltaic device and the energy storage device jointly supply power to the air conditioning unit;

[0135] When the power supply mode is the third mode, the energy storage device is controlled to not work and the photovoltaic device is controlled to work so that the photovoltaic device can supply power to the air conditioning unit;

[0136] When the power supply mode is the fourth mode, the photovoltaic device is controlled to supply power to the air conditioning unit and to store energy for the energy storage device.

[0137] This embodiment provides a control method for a photovoltaic air conditioner. The photovoltaic air conditioner includes a control valve assembly for switching the operating mode of the cold storage device. Based on the power generation of the photovoltaic device and the stored energy of the energy storage device in the off-grid state, and combined with the determined first time interval before the photovoltaic air conditioner's next grid connection and the outdoor light intensity information during that first time interval, the method achieves coordinated decision-making regarding the operating mode of the cold storage device, the power supply mode for the air conditioning unit, and the operating load of the air conditioning unit. By controlling the control valve assembly, the photovoltaic device, the energy storage device, and the air conditioning unit, the method ensures that the cold storage device is in operating mode, the photovoltaic device and energy storage device supply power to the air conditioning unit in power supply mode, and the air conditioning unit operates at its operating load. This fundamentally solves the problem of the disconnect between energy storage and cold storage capacity in existing technologies. While ensuring the cooling comfort of the photovoltaic air conditioner in the off-grid state, it extends the overall runtime of the photovoltaic air conditioner, thus achieving an effective balance between runtime and comfort in the off-grid state.

[0138] refer to Figure 4 , Figure 4 This is a schematic diagram of a control device for a photovoltaic air conditioner provided in an embodiment of this application. The photovoltaic air conditioner includes a photovoltaic device, an energy storage device, an air conditioning unit, a control valve assembly, and a cold storage device. The photovoltaic device is connected to the energy storage device, the air conditioning unit is connected to both the photovoltaic device and the energy storage device, and the cold storage device is connected to the air conditioning unit via the control valve assembly, which is used to switch the operating mode of the cold storage device. The device includes an acquisition module 401, a determination module 402, and a control module 403. The acquisition module 401 is used to acquire the power generation of the photovoltaic device and the power of the energy storage device when the photovoltaic air conditioner is in an off-grid state. The system includes: a power storage module 402, which determines the first time from the current time to the next grid connection of the photovoltaic air conditioner and the light intensity information of the outdoor environment where the photovoltaic air conditioner is located during the first time; the determination module 402 is used to determine the working mode of the cold storage device, the power supply mode for supplying power to the air conditioning unit, and the operating load of the air conditioning unit based on the power generation, the stored power, the first time, and the light intensity information; and a control module 403, which controls the control valve assembly based on the working mode, controls the photovoltaic device and the energy storage device based on the power supply mode, and controls the air conditioning unit based on the operating load.

[0139] In this embodiment, the control valve assembly includes a first control valve and a second control valve; the air conditioning unit includes an outdoor unit and an indoor unit; the outdoor unit, the cold storage device, and the first control valve are sequentially connected to form a cold storage circuit; the outdoor unit, the cold storage device, the second control valve, and the indoor unit are sequentially connected to form a cold release circuit; the control module 403 is further configured to:

[0140] When the working mode is the cold storage mode, the first control valve is opened and the second control valve is closed so that the cold storage device works in the cold storage mode.

[0141] When the working mode is the cold release mode, the first control valve is closed and the second control valve is opened so that the cold storage device works in the cold release mode.

[0142] When the operating mode is idle mode, the first control valve and the second control valve are closed so that the cold storage device operates in the idle mode.

[0143] In this embodiment, the photovoltaic air conditioner further includes a first throttle valve, one end of which is connected to the outdoor unit, and the other end of which is connected to the cold storage device; the control module 403 is also used for:

[0144] When the working mode is the cold storage mode, the first temperature of the indoor environment where the indoor unit is located and the first superheat of the cold storage device are obtained.

[0145] The opening degree of the first throttle valve is controlled based on the first superheat.

[0146] During the process of controlling the opening of the first throttle valve based on the first superheat, the second temperature of the indoor environment where the indoor unit is located is obtained;

[0147] When the difference between the first temperature and the second temperature is less than the first temperature threshold, the opening of the first throttle valve is reduced.

[0148] When the working mode is the cooling mode, the opening of the first throttle valve is controlled based on the first preset opening degree, where the first preset opening degree is the maximum opening degree of the first throttle valve.

[0149] When the working mode is the idle mode, the opening degree of the first throttle valve is controlled based on the second preset opening degree, which is the minimum opening degree of the first throttle valve.

[0150] In this embodiment, the photovoltaic air conditioner further includes a second throttle valve, one end of which is connected to the outdoor unit, and the other end of which is connected to the indoor unit; the control module 403 is also used for:

[0151] When controlling the control valve assembly, the photovoltaic device, the energy storage device and the air conditioning unit, the opening degree of the second throttle valve is controlled based on a third preset opening degree, wherein the third preset opening degree is the maximum opening degree of the second throttle valve;

[0152] During the process of controlling the opening of the second throttle valve based on the third preset opening degree, the third temperature of the indoor environment where the indoor unit is located and the target set temperature of the indoor environment where the indoor unit is located are obtained.

[0153] When the difference between the third temperature and the target set temperature is less than the second temperature threshold, the opening of the second throttle valve is reduced.

[0154] In this embodiment, the determining module 402 is further configured to:

[0155] When the power generation is less than or equal to a preset power threshold, the first operating power required for the operation of the air conditioning unit, the power supply mode for supplying power to the air conditioning unit is determined as the first mode, and the operating mode of the cold storage device is the cold release mode. The preset power threshold is used to characterize the power threshold value that enables the photovoltaic device to generate electricity.

[0156] Based on the light intensity information, the first duration, and the stored power, a second operating power that can power the air conditioning unit in the first mode is determined.

[0157] The operating load of the air conditioning unit is determined based on the first operating power and the second operating power.

[0158] In this embodiment, the control module 403 is further configured to:

[0159] When the power supply mode is the first mode, the photovoltaic device is controlled to not work and the energy storage device is controlled to work, so that the energy storage device supplies power to the air conditioning unit.

[0160] In this embodiment, the determining module 402 is further configured to:

[0161] Based on the light intensity information, determine the second time required for the photovoltaic device to generate electricity so that the air conditioning unit can operate at the first operating power from the present moment;

[0162] The minimum first target duration is determined from the first duration and the second duration;

[0163] Based on the stored power and the first target duration, a second operating power is determined that can power the air conditioning unit in the first mode.

[0164] In this embodiment, the determining module 402 is further configured to:

[0165] When the first operating power is less than or equal to the second operating power, the operating load of the air conditioning unit is determined based on the first operating power;

[0166] When the first operating power is greater than the second operating power, the operating load of the air conditioning unit is determined based on the second operating power.

[0167] In this embodiment, the determining module 402 is further configured to:

[0168] When the power generation is greater than a preset power threshold, the first operating load of the air conditioning unit is obtained. The first operating load is the maximum operating load of the air conditioning unit. The preset power threshold is used to characterize the power threshold value that enables the photovoltaic device to generate electricity.

[0169] When the power generation capacity meets the requirements of the air conditioning unit operating at the first operating load, the operating load of the air conditioning unit is determined to be the first operating load, and the operating mode of the cold storage device and the power supply mode for supplying power to the air conditioning unit are determined according to the stored power and the first duration.

[0170] When the power generation capacity does not meet the requirements of the air conditioning unit operating at the first operating load, the power supply mode for supplying power to the air conditioning unit is determined to be the second mode and the operating mode of the cold storage device is the cold release mode.

[0171] Based on the power generation, the light intensity information, the first duration, and the stored energy, a fourth operating power that can power the air conditioning unit in the second mode is determined.

[0172] The operating load of the air conditioning unit is determined based on the fourth operating power.

[0173] In this embodiment, the control module 403 is further configured to:

[0174] When the power supply mode is the second mode, the photovoltaic device and the energy storage device are controlled to work so that the photovoltaic device and the energy storage device jointly supply power to the air conditioning unit.

[0175] In this embodiment, the determining module 402 is further configured to:

[0176] When the stored power is greater than or equal to a preset power threshold, or when the stored power is less than the preset power threshold and the first duration is less than a preset duration threshold, the working mode of the cold storage device is determined to be the cold storage mode and the power supply mode for supplying power to the air conditioning unit is determined to be the third mode.

[0177] When the stored power is less than the preset power threshold and the first duration is greater than or equal to the preset duration threshold, the working mode of the cold storage device is determined to be idle mode and the power supply mode for supplying power to the air conditioning unit is determined to be the fourth mode.

[0178] In this embodiment, the control module 403 is further configured to:

[0179] When the power supply mode is the third mode, the energy storage device is controlled to not work and the photovoltaic device is controlled to work, so that the photovoltaic device supplies power to the air conditioning unit;

[0180] When the power supply mode is the fourth mode, the photovoltaic device is controlled to supply power to the air conditioning unit and to store energy for the energy storage device.

[0181] In this embodiment, the determining module 402 is further configured to:

[0182] Based on the light intensity information, determine the third time required for the photovoltaic device to generate electricity so that the air conditioning unit can operate at the generated power.

[0183] The minimum second target duration is determined from the first duration and the third duration;

[0184] Based on the stored energy and the second target duration, a fifth operating power is determined by the energy storage device to supply power for the operation of the air conditioning unit;

[0185] Based on the power generation capacity and the fifth operating power, a fourth operating power is determined that can supply power for the operation of the air conditioning unit in the second mode.

[0186] In this embodiment, the determining module 402 is further configured to:

[0187] Obtain the connection status between the photovoltaic device and the power grid;

[0188] When the connection status is not connected, it is determined that the photovoltaic air conditioner is in an off-grid state;

[0189] When the connection status is "connected", the photovoltaic air conditioner is determined to be in grid-connected state.

[0190] In this embodiment, the control module 403 is further configured to:

[0191] When the photovoltaic air conditioner is in grid-connected state, if the indoor unit has a cooling demand, the first operating load of the air conditioning unit is obtained, and the working mode of the cold storage device is determined to be the cold storage mode. The first operating load is the maximum operating load of the air conditioning unit.

[0192] Based on the cold storage mode, the first control valve is opened and the second control valve is closed, so that the cold storage device operates in the cold storage mode. Based on the first operating load, the air conditioning unit is controlled. Based on the cold storage mode, the steps of obtaining the first temperature of the indoor environment where the indoor unit is located and the first superheat of the cold storage device are executed to control the opening of the first throttle valve, and the steps of controlling the second throttle valve based on the third preset opening are executed to control the opening of the second throttle valve.

[0193] In this embodiment, the determining module 402 is further configured to:

[0194] Determine whether the indoor unit has a cooling requirement.

[0195] In this embodiment, the control module 403 is further configured to:

[0196] If the indoor unit has no cooling demand, obtain the second superheat of the cold storage device and the second operating load of the outdoor unit, and determine that the working mode of the cold storage device is the cold storage mode, and the second operating load is the maximum operating load of the outdoor unit;

[0197] The first control valve is opened and the second control valve is closed based on the cold storage mode, so that the cold storage device operates in the cold storage mode. The outdoor unit is controlled based on the second operating load, the opening degree of the first throttle valve is controlled based on the second superheat, and the opening degree of the second throttle valve is controlled based on the fourth preset opening degree, which is the minimum opening degree of the second throttle valve.

[0198] This embodiment provides a control device for a photovoltaic air conditioner. The photovoltaic air conditioner includes a control valve assembly for switching the operating mode of the cold storage device. Based on the power generation of the photovoltaic device and the stored energy of the energy storage device in the off-grid state, and combined with the determined first time interval before the photovoltaic air conditioner's next grid connection and the outdoor light intensity information during that time interval, the device achieves coordinated decision-making regarding the operating mode of the cold storage device, the power supply mode for the air conditioning unit, and the operating load of the air conditioning unit. By controlling the control valve assembly, the photovoltaic device, the energy storage device, and the air conditioning unit, the device ensures that the cold storage device is in operating mode, the photovoltaic device and energy storage device supply power to the air conditioning unit in power supply mode, and the air conditioning unit operates at its operating load. This fundamentally solves the problem of the disconnect between energy storage and cold storage capacity in existing technologies. While ensuring the cooling comfort of the photovoltaic air conditioner in off-grid state, it extends the overall runtime of the photovoltaic air conditioner, thus achieving an effective balance between runtime and comfort in off-grid state.

[0199] like Figure 5As shown in the figure, this application embodiment provides a photovoltaic air conditioner, including a processor 501, a communication interface 502, a memory 503, and a communication bus 504. The processor 501, communication interface 502, and memory 503 communicate with each other via the communication bus 504.

[0200] Memory 503 is used to store computer programs;

[0201] In one embodiment of this application, when the processor 501 executes the program stored in the memory 503, it implements the control method of the photovoltaic air conditioner provided in any of the aforementioned method embodiments, and its function is similar, so it will not be described again here.

[0202] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the photovoltaic air conditioner control method provided in any of the foregoing method embodiments.

[0203] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0204] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0205] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0206] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A control method of a photovoltaic air conditioner, characterized by, The photovoltaic air conditioner comprises a photovoltaic device, an energy storage device, an air conditioner unit, a control valve assembly and a cold storage device, the photovoltaic device is connected with the energy storage device, the air conditioner unit is connected with the photovoltaic device and the energy storage device, the cold storage device is connected with the air conditioner unit through the control valve assembly, and the control valve assembly is used for switching the working mode of the cold storage device; the method comprises: When the photovoltaic air conditioner is in an off-grid state, the power generation of the photovoltaic device and the storage power of the energy storage device are acquired; The first duration from the current to the next grid connection of the photovoltaic air conditioner and the light intensity information of the outdoor environment of the photovoltaic air conditioner within the first duration are determined; According to the power generation, the storage power, the first duration and the light intensity information, the working mode of the cold storage device, the power supply mode for supplying power to the air conditioner unit and the operation load of the air conditioner unit are determined; The control valve assembly is controlled based on the working mode, the photovoltaic device and the energy storage device are controlled based on the power supply mode, and the air conditioner unit is controlled based on the operation load; The working mode of the cold storage device, the power supply mode for supplying power to the air conditioner unit and the operation load of the air conditioner unit are determined according to the power generation, the storage power, the first duration and the light intensity information, comprising: When the power generation is less than or equal to a preset power threshold, a first operation power required for the operation of the air conditioner unit is determined, the power supply mode for supplying power to the air conditioner unit is a first mode, and the working mode of the cold storage device is a cold release mode, the preset power threshold is used to represent a power threshold value of whether the photovoltaic device can generate power; According to the light intensity information, the first duration and the storage power, a second operation power that can be used for the operation of the air conditioner unit in the first mode is determined; According to the first operation power and the second operation power, the operation load of the air conditioner unit is determined; The control valve assembly comprises a first control valve and a second control valve, the air conditioner unit comprises an outdoor unit and an indoor unit, the outdoor unit, the cold storage device and the first control valve are sequentially connected to form a cold storage circuit, and the outdoor unit, the cold storage device, the second control valve and the indoor unit are sequentially connected to form a cold release circuit; The control valve assembly is controlled based on the working mode, comprising:

2. The method of claim 1, wherein, When the working mode is a cold storage mode, the first control valve is controlled to be opened and the second control valve is controlled to be closed, so that the cold storage device works in the cold storage mode; When the working mode is a cold release mode, the first control valve is controlled to be closed and the second control valve is controlled to be opened, so that the cold storage device works in the cold release mode; ​ ​ In the idle mode, the first control valve is controlled to be closed and the second control valve is controlled to be closed, so that the cold storage device operates in the idle mode.

3. The method of claim 2, wherein, The photovoltaic air conditioner further comprises a first throttling valve, one end of the first throttling valve being connected with the outdoor unit, and the other end of the first throttling valve being connected with the cold storage device; after the working mode is obtained, the method further comprises: In the cold storage mode, a first temperature of an indoor environment where the indoor unit is located and a first superheat degree of the cold storage device are obtained; The opening degree of the first throttling valve is controlled based on the first superheat degree; In the process of controlling the opening degree of the first throttling valve based on the first superheat degree, a second temperature of the indoor environment where the indoor unit is located is obtained; When a difference between the first temperature and the second temperature is less than a first temperature threshold, the opening degree of the first throttling valve is controlled to be reduced; In the cold release mode, the opening degree of the first throttling valve is controlled based on a first preset opening degree, the first preset opening degree being a maximum opening degree of the first throttling valve; In the idle mode, the opening degree of the first throttling valve is controlled based on a second preset opening degree, the second preset opening degree being a minimum opening degree of the first throttling valve.

4. The method of claim 3, wherein, The photovoltaic air conditioner further comprises a second throttling valve, one end of the second throttling valve being connected with the outdoor unit, and the other end of the second throttling valve being connected with the indoor unit; the method further comprises: In the process of controlling the control valve assembly, the photovoltaic device, the energy storage device and the air conditioning unit, the opening degree of the second throttling valve is controlled based on a third preset opening degree, the third preset opening degree being a maximum opening degree of the second throttling valve; In the process of controlling the opening degree of the second throttling valve based on the third preset opening degree, a third temperature of the indoor environment where the indoor unit is located and a target set temperature of the indoor environment where the indoor unit is located are obtained; When a difference between the third temperature and the target set temperature is less than a second temperature threshold, the opening degree of the second throttling valve is controlled to be reduced.

5. The method of claim 1, wherein, The second running power of the air conditioning unit that can be supplied by the first mode of power supply is determined according to the light intensity information, the first time length and the stored electric quantity, comprising: The second time length required for the photovoltaic device to generate electricity from the current to make the air conditioning unit run at the first running power is determined according to the light intensity information; The minimum first target time length is determined from the first time length and the second time length; The second running power of the air conditioning unit that can be supplied by the first mode of power supply is determined according to the stored electric quantity and the first target time length; The running load of the air conditioning unit is determined according to the first running power and the second running power, comprising: When the first running power is less than or equal to the second running power, the running load of the air conditioning unit is determined according to the first running power; When the first running power is greater than the second running power, the running load of the air conditioning unit is determined according to the second running power.

6. The method of claim 1, wherein, The working mode of the cold storage device, the power supply mode for supplying power to the air conditioning unit, and the operation load of the air conditioning unit are determined according to the power generation, the stored power, the first time length, and the light intensity information, and the method comprises the following steps: When the power generation is greater than a preset power threshold, a first operation load of the air conditioning unit is obtained, the first operation load being a maximum operation load of the air conditioning unit, and the preset power threshold being a power threshold value for indicating whether the photovoltaic device can generate power; When the power generation meets the operation of the air conditioning unit at the first operation load, the operation load of the air conditioning unit is determined as the first operation load, and the working mode of the cold storage device and the power supply mode for supplying power to the air conditioning unit are determined according to the stored power and the first time length; When the power generation does not meet the operation of the air conditioning unit at the first operation load, the power supply mode for supplying power to the air conditioning unit is determined as a second mode, and the working mode of the cold storage device is determined as a cold release mode; The fourth operation power of the air conditioning unit that can be operated by the power supply in the second mode is determined according to the power generation, the light intensity information, the first time length, and the stored power; The operation load of the air conditioning unit is determined according to the fourth operation power; The photovoltaic device and the energy storage device are controlled based on the power supply mode, and the method comprises the following steps: When the power supply mode is the second mode, the photovoltaic device and the energy storage device are controlled to work so that the photovoltaic device and the energy storage device jointly supply power to the air conditioning unit.

7. The method of claim 6, wherein, The working mode of the cold storage device and the power supply mode for supplying power to the air conditioning unit are determined according to the stored power and the first time length, and the method comprises the following steps: When the stored power is greater than or equal to a preset power threshold, or when the stored power is less than the preset power threshold and the first time length is less than a preset time length threshold, the working mode of the cold storage device is determined as a cold storage mode, and the power supply mode for supplying power to the air conditioning unit is determined as a third mode; When the stored power is less than the preset power threshold and the first time length is greater than or equal to a preset time length threshold, the working mode of the cold storage device is determined as an idle mode, and the power supply mode for supplying power to the air conditioning unit is determined as a fourth mode; The photovoltaic device and the energy storage device are controlled based on the power supply mode, and the method comprises the following steps: When the power supply mode is the third mode, the energy storage device is controlled not to work and the photovoltaic device is controlled to work so that the photovoltaic device supplies power to the air conditioning unit; When the power supply mode is the fourth mode, the photovoltaic device is controlled to supply power to the air conditioning unit and the photovoltaic device is controlled to store energy for the energy storage device.

8. The method of claim 6, wherein, The fourth operation power of the air conditioning unit that can be operated by the power supply in the second mode is determined according to the power generation, the light intensity information, the first time length, and the stored power, and the method comprises the following steps: The third time length required for the photovoltaic device to generate power from the current to make the air conditioning unit operate at the power generation is determined according to the light intensity information; determining a second target time length from the first time length and the third time length; determining a fifth running power of the air conditioning unit according to the storage power and the second target time length; determining a fourth running power of the air conditioning unit according to the power generation and the fifth running power.

9. The method of claim 4, wherein, The air conditioning unit is also connected to a power grid, and the off-grid state is determined by the following method: acquiring a connection state between the photovoltaic device and the power grid; when the connection state is not connected, determining that the photovoltaic air conditioner is in an off-grid state; after the step of acquiring the connection state between the photovoltaic device and the power grid, the method further comprises: when the connection state is connected, determining that the photovoltaic air conditioner is in a grid-connected state; when the photovoltaic air conditioner is in the grid-connected state, if the indoor unit has a refrigeration demand, acquiring a first running load of the air conditioning unit, and determining that the working mode of the cold storage device is a cold storage mode, the first running load being a maximum running load of the air conditioning unit; controlling the first control valve to open and the second control valve to close based on the cold storage mode, so that the cold storage device is in the cold storage mode, controlling the air conditioning unit based on the first running load, performing the steps of acquiring the first temperature of the indoor environment where the indoor unit is located and the first superheat degree of the cold storage device based on the cold storage mode, to control the opening degree of the first throttling valve, and performing the step of controlling the opening degree of the second throttling valve based on the third preset opening degree, to control the opening degree of the second throttling valve.

10. The method of claim 9, wherein, before the step of acquiring the first running load of the air conditioning unit, the method further comprises: determining whether the indoor unit has a refrigeration demand; after the step of determining whether the indoor unit has a refrigeration demand, the method further comprises: if the indoor unit does not have a refrigeration demand, acquiring a second superheat degree of the cold storage device and a second running load of the outdoor unit, and determining that the working mode of the cold storage device is a cold storage mode, the second running load being a maximum running load of the outdoor unit; controlling the first control valve to open and the second control valve to close based on the cold storage mode, so that the cold storage device is in the cold storage mode, controlling the outdoor unit based on the second running load, controlling the opening degree of the first throttling valve based on the second superheat degree, and controlling the opening degree of the second throttling valve based on a fourth preset opening degree, the fourth preset opening degree being a minimum opening degree of the second throttling valve.

11. A control device of a photovoltaic air conditioner, characterized by, The photovoltaic air conditioner comprises a photovoltaic device, an energy storage device, an air conditioning unit, a control valve assembly and a cold storage device, the photovoltaic device is connected to the energy storage device, the air conditioning unit is connected to the photovoltaic device and the energy storage device, the cold storage device is connected to the air conditioning unit through the control valve assembly, and the control valve assembly is used to switch the working mode of the cold storage device; the device comprises: an acquisition module, configured to acquire a power generation of the photovoltaic device and a storage power of the energy storage device when the photovoltaic air conditioner is in an off-grid state; determining module configured to determine a first duration from a current time to a next time of grid connection of the photovoltaic air conditioner and illumination intensity information of an outdoor environment in which the photovoltaic air conditioner is located within the first duration; the determining module is configured to determine, according to the power generation, the stored power, the first duration and the illumination intensity information, an operation mode of the cold storage device, a power supply mode for supplying power to the air conditioning unit and an operation load of the air conditioning unit; a control module configured to control the control valve assembly based on the operation mode, control the photovoltaic device and the energy storage device based on the power supply mode, and control the air conditioning unit based on the operation load; the determining module is further configured to, when the power generation is less than or equal to a preset power threshold, determine a first operation power required for the air conditioning unit to operate, a first mode of the power supply mode for supplying power to the air conditioning unit, and a cold release mode of the operation mode of the cold storage device, the preset power threshold being a power threshold value representing whether the photovoltaic device can generate power; determine, according to the illumination intensity information, the first duration and the stored power, a second operation power that can be supplied to the air conditioning unit to operate in the first mode of the power supply mode; determine, according to the first operation power and the second operation power, the operation load of the air conditioning unit; the control module is further configured to, when the power supply mode is the first mode, control the photovoltaic device to be inoperative and control the energy storage device to be operative, so as to supply power to the air conditioning unit by the energy storage device.

12. A photovoltaic air conditioner characterized by, comprising: a processor, a memory, a photovoltaic device, an energy storage device, an air conditioning unit, a control valve assembly and a cold storage device, the processor being connected with the memory, the photovoltaic device, the air conditioning unit and the control valve assembly respectively, the photovoltaic device being connected with the energy storage device, the air conditioning unit being connected with the photovoltaic device and the energy storage device, the cold storage device being connected with the air conditioning unit through the control valve assembly, the control valve assembly being configured to switch an operation mode of the cold storage device, and the processor being configured to execute the control method of the photovoltaic air conditioner according to any one of claims 1-10.

13. The photovoltaic air conditioner of claim 12, wherein, the control valve assembly comprises a first control valve and a second control valve, the air conditioning unit comprises an outdoor unit and an indoor unit, the outdoor unit, the cold storage device and the first control valve are connected in sequence to form a cold storage circuit, and the outdoor unit, the cold storage device, the second control valve and the indoor unit are connected in sequence to form a cold release circuit.

14. The photovoltaic air conditioner of claim 13, wherein, The photovoltaic air conditioner further comprises a first throttling valve, one end of the first throttling valve being connected with the outdoor unit, and the other end of the first throttling valve being connected with the cold storage device.

15. The photovoltaic air conditioner of claim 14, wherein, The photovoltaic air conditioner further comprises a second throttling valve, one end of the second throttling valve being connected with the outdoor unit, and the other end of the second throttling valve being connected with the indoor unit.

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