Control method and control device of photovoltaic air conditioning system and photovoltaic air conditioning system

Abstract

The invention discloses a control method and device of a photovoltaic air conditioning system and the photovoltaic air conditioning system. The technical problem that an existing photovoltaic air conditioning system is unstable in operation is solved. The control method comprises the following steps: when the photovoltaic air-conditioning system is in an off-grid state and the real-time output power of the photovoltaic module is smaller than the real-time required power of the air-conditioning load, executing the following control process: acquiring the difference between the real-time required power of the air-conditioning load and the real-time output power of the photovoltaic module as a power deviation; processing the power deviation to obtain a rotating speed for compensation; obtaining a difference between a given rotating speed and the compensation rotating speed as a target rotating speed; the rotating speed for compensation is processed, and the rotating speed adjusting step length is obtained; acquiring the real-time rotating speed of the air conditioner compressor, and comparing the real-time rotating speed with the target rotating speed; according to the comparison result, the real-time rotating speed, the rotating speed adjusting step length and the target rotating speed are combined to control the air conditioner compressor to operate.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy-saving air treatment, and in particular, relates to a control method and a control device of a photovoltaic air conditioning system and a photovoltaic air conditioning system. Background Art

[0002] As an energy-saving air-conditioning system, photovoltaic air-conditioning system has been widely used in many fields such as production and life with the increasingly urgent demand for energy conservation and emission reduction and the continuous maturity of photovoltaic technology.

[0003] In order to meet the user's demand for air conditioning and make full use of solar energy, when the power grid is normally powered, the photovoltaic air conditioning system usually operates in a hybrid power mode, with the power grid and photovoltaic modules simultaneously powering the air conditioning system. After the power grid is cut off, the photovoltaic air conditioning system is off-grid, and the photovoltaic modules provide power for the air conditioning system. When the power provided by the photovoltaic modules cannot meet the power required by the air conditioning system, the air conditioning system often loses step or shuts down, causing the air conditioning system to operate unstably and affecting the use of the air conditioning system. Summary of the invention

[0004] The object of the present invention is to provide a control method and a control device for a photovoltaic air-conditioning system, so as to improve the operation stability of the photovoltaic air-conditioning system.

[0005] In order to achieve the above-mentioned purpose of the invention, the control method of the photovoltaic air conditioning system provided by the present invention is implemented by adopting the following technical scheme: A control method for a photovoltaic air conditioning system, comprising: Obtain the real-time output power of the photovoltaic components in the photovoltaic air-conditioning system and the real-time required power of the air-conditioning load; When the photovoltaic air conditioning system is in an off-grid state and the real-time output power of the photovoltaic module is less than the real-time required power of the air conditioning load, the following control process is performed: Obtaining a difference between the real-time required power of the air-conditioning load and the real-time output power of the photovoltaic module as a power deviation; Processing the power deviation to obtain a rotation speed for compensation; The difference between the given speed and the compensation speed is obtained as the target speed; the compensation speed is processed to obtain the speed adjustment step length; Obtaining the real-time speed of the air-conditioning compressor and comparing it with the target speed; When the real-time speed is less than or equal to the target speed, taking the real-time speed as the base speed, increasing the real-time speed by using the speed adjustment step to obtain a first actual speed, and controlling the operation of the air-conditioning compressor by using the first actual speed until the first actual speed increases to the target speed; When the real-time speed is greater than the target speed, the real-time speed is taken as the base speed and the speed adjustment step is used to reduce the real-time speed to obtain a second actual speed, and the air-conditioning compressor is controlled to operate at the second actual speed until the second actual speed is reduced to the target speed.

[0006] In some embodiments of the present application, the power deviation is processed to obtain a compensation rotation speed, specifically including: Proportional integration processing is performed on the power deviation to obtain the compensation rotation speed.

[0007] In some embodiments of the present application, the compensation speed is processed to obtain the speed adjustment step, which specifically includes: Performing a proportional operation or a proportional integral operation on the compensation speed to obtain an operation result; The calculation result is limited to obtain the rotation speed adjustment step.

[0008] In some embodiments of the present application, the speed setting is determined by the following process: Obtain the real-time temperature and humidity of the indoor environment where the photovoltaic air-conditioning system is located and the real-time fan speed of the indoor unit in the photovoltaic air-conditioning system; Determine a real-time effective temperature index according to the real-time temperature, the real-time humidity and the real-time fan speed; Obtaining a difference between a given effective temperature index and the real-time effective temperature index as an effective temperature index deviation; The effective temperature deviation is processed to obtain the rotational speed setting.

[0009] In some embodiments of the present application, the effective temperature deviation is processed to obtain the speed setting, specifically including: The effective temperature deviation is processed by proportional integration to obtain the speed setting.

[0010] In order to achieve the above-mentioned purpose of the invention, the control device of the photovoltaic air conditioning system provided by the present invention adopts the following technical solutions: A control device for a photovoltaic air conditioning system, comprising: A real-time output power acquisition unit of a photovoltaic module, used to acquire the real-time output power of a photovoltaic module in a photovoltaic air-conditioning system; The real-time power demand acquisition unit of the air-conditioning load is used to acquire the real-time power demand of the air-conditioning load in the photovoltaic air-conditioning system; The control unit is configured to execute the following control process when the photovoltaic air conditioning system is in an off-grid state and the real-time output power of the photovoltaic assembly is less than the real-time required power of the air conditioning load: Obtaining a difference between the real-time required power of the air-conditioning load and the real-time output power of the photovoltaic module as a power deviation; Processing the power deviation to obtain a rotation speed for compensation; The difference between the given speed and the compensation speed is obtained as the target speed; the compensation speed is processed to obtain the speed adjustment step length; Obtaining the real-time speed of the air-conditioning compressor and comparing it with the target speed; When the real-time speed is less than or equal to the target speed, taking the real-time speed as the base speed, increasing the real-time speed by using the speed adjustment step to obtain a first actual speed, and controlling the operation of the air-conditioning compressor by using the first actual speed until the first actual speed increases to the target speed; When the real-time speed is greater than the target speed, the real-time speed is taken as the base speed and the speed adjustment step is used to reduce the real-time speed to obtain a second actual speed, and the air-conditioning compressor is controlled to operate at the second actual speed until the second actual speed is reduced to the target speed.

[0011] Another object of the present invention is to provide a photovoltaic air-conditioning system, comprising a photovoltaic component and an air-conditioner, wherein the photovoltaic air-conditioning system also comprises the control device of the photovoltaic air-conditioning system mentioned above.

[0012] Another object of the present invention is to provide a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the control method of the photovoltaic air-conditioning system described above is implemented.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are: The photovoltaic air-conditioning system and its control method and control device provided by the present invention are as follows: when the photovoltaic air-conditioning system is in an off-grid state where the power grid is off, the photovoltaic air-conditioning system is powered by a photovoltaic module; when the real-time output power of the photovoltaic module is less than the real-time required power of the air-conditioning load, a compensation speed is determined according to the power deviation between the real-time output power and the real-time required power, a target speed is determined according to the compensation speed and a given speed, a speed adjustment step is obtained according to the compensation speed, and finally the compressor is controlled according to the speed adjustment step and the target speed; the target speed is determined according to the power supply and demand, and the compressor is controlled at the target speed, so that the operation of the air-conditioning follows the change of the power supply and demand, and the air-conditioning operation is prevented from being out of step or shutting down due to the mismatch between supply and demand, thereby improving the operation stability of the air-conditioning; and, since the obtained speed adjustment step is a non-fixed value, the speed of the air-conditioning compressor is adjusted dynamically and step by step based on the non-fixed first speed adjustment step, so that the speed of the air-conditioning compressor can adapt to the changes of different working conditions of the photovoltaic air-conditioning system, effectively solving the problem of unstable operation of the air-conditioning due to the sudden change of the required power of the air-conditioning load and / or the output power of the photovoltaic module, and further improving the operation stability of the air-conditioning.

[0014] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief introduction will be given below to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a flow chart of a first embodiment of a control method for a photovoltaic air conditioning system of the present invention; Figure 2 It is a flow chart of a second embodiment of the control method of the photovoltaic air conditioning system of the present invention; Figure 3 It is a structural schematic diagram of an embodiment of a control device for a photovoltaic air conditioning system of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] It should be noted that the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] Figure 1 The flowchart of the first embodiment of the control method of the photovoltaic air conditioning system of the present invention is shown. In this embodiment, the photovoltaic air conditioning system includes a photovoltaic module and an air conditioner, and the air conditioner can be powered by a power grid and / or a photovoltaic module. The control method of this embodiment includes: S11: Determine that the photovoltaic air-conditioning system is in an off-grid state and the real-time output power of the photovoltaic components is less than the real-time required power of the air-conditioning load.

[0020] In this embodiment, it is necessary to obtain the real-time output power of the photovoltaic components in the photovoltaic air-conditioning system and the real-time required power of the air-conditioning load.

[0021] The real-time output power of the photovoltaic module is the output power of the photovoltaic module obtained in real time according to the set sampling period, and the real-time demand power of the air-conditioning load is the demand power of the air-conditioning load obtained in real time according to the set sampling period. The method for obtaining the real-time output power of the photovoltaic module can be implemented by using relevant technologies, and this embodiment does not limit the specific acquisition method. In some embodiments, the real-time output power of the photovoltaic module is obtained according to the real-time output voltage and real-time output current of the photovoltaic module. In some other embodiments, the real-time output power of the photovoltaic module is obtained according to the prediction of the photovoltaic module power generation prediction model. The method for obtaining the real-time demand power of the air-conditioning load can be implemented by using relevant technologies, and this embodiment does not limit the specific acquisition method. In some embodiments, the real-time demand power of the air-conditioning load is obtained according to the prediction of the air-conditioning load prediction model. In some other embodiments, the real-time demand power of the air-conditioning load is calculated based on the real-time temperature and set temperature of the indoor environment where the air-conditioning is located.

[0022] In this embodiment, the grid state is also detected in real time. When the grid is powered off, it is determined that the photovoltaic air conditioning system is in an off-grid state. In the off-grid state, the photovoltaic air conditioning system is powered solely by the photovoltaic module. In addition, in the off-grid state, the obtained real-time output power of the photovoltaic module is compared with the real-time required power of the air conditioning load to determine whether the real-time output power of the photovoltaic module is less than the real-time required power of the air conditioning load.

[0023] If the real-time output power of the photovoltaic module is less than the real-time required power of the air conditioning load, it means that the power provided by the photovoltaic module cannot meet the power required by the air conditioning system. To ensure the use of the air conditioning, it is necessary to control the air conditioning to reduce the actual operating power. In addition, to ensure the stability of the air conditioning when it is running at reduced power, this embodiment uses the following control process from step S12 to step S16 to control the air conditioning.

[0024] S12: Obtain the difference between the real-time required power of the air conditioning load and the real-time output power of the photovoltaic module as the power deviation.

[0025] S13: Process the power deviation to obtain a rotation speed for compensation.

[0026] The compensation speed is determined according to the power deviation and changes with the power deviation. This embodiment does not limit the specific method for determining the compensation speed.

[0027] In some embodiments, a proportional-integral process is performed on the power deviation to obtain a rotation speed for compensation.

[0028] S14: Obtain the difference between the given speed and the compensation speed as the target speed; process the compensation speed to obtain the speed adjustment step.

[0029] The speed setting is known and obtainable. In some embodiments, the speed setting is a set value, which is a fixed value. In some other embodiments, the speed setting may also be a variable value. This embodiment does not limit the specific determination method of the speed setting. Then, the difference between the speed setting and the compensation speed is calculated, and the difference is determined as the target speed.

[0030] The speed adjustment step size varies with the change of the compensation speed, and this embodiment does not limit the specific determination method.

[0031] In some embodiments, a proportional operation or a proportional integral operation is performed on the compensation speed to obtain an operation result; then, the operation result is subjected to a limiting process to obtain the compensation speed. The limiting process of the operation result includes a maximum value limiting process and a minimum value limiting process. By performing a limiting process on the operation result to obtain the compensation speed, it is avoided that the compensation speed is too large or too small to affect the operation stability during the subsequent air conditioning control.

[0032] S15: Obtain the real-time speed of the air-conditioning compressor and compare it with the target speed.

[0033] The real-time speed of the air-conditioning compressor is the speed of the air-conditioning compressor obtained in real time according to a set sampling period.

[0034] S16: According to the comparison result, the air conditioning compressor is controlled to operate in combination with the real-time speed, the speed adjustment step and the target speed.

[0035] Specifically, when the real-time speed is less than or equal to the target speed, the compressor is controlled to increase the speed. Furthermore, when increasing the speed, the real-time speed is used as the base speed, and the speed adjustment step is used to increase the real-time speed to obtain the first actual speed. The air-conditioning compressor is controlled to operate at the first actual speed until the first actual speed increases to the target speed, and the speed adjustment is stopped. It should be understood that the first actual speed obtained by increasing the speed adjustment step at the current real-time speed will be used as the real-time speed for the next speed adjustment, and the speed adjustment step will be increased on this basis to obtain the next first actual speed. For example, the first real-time speed is recorded as N up , the speed adjustment step is recorded as N a , the first actual speed is recorded as N n1 , then: N n1 = N up +k×N a , k is a natural number, indicating the number of adjustments.

[0036] If the real-time speed is greater than the target speed, the compressor is controlled to reduce the speed. When reducing the speed, the real-time speed is used as the base speed, and the speed adjustment step is used to reduce the real-time speed to obtain the second actual speed, and the air-conditioning compressor is controlled to operate at the second actual speed until the second actual speed is reduced to the target speed. Similarly, the second actual speed obtained by reducing the speed adjustment step from the current real-time speed will be used as the real-time speed for the next speed adjustment, and the speed adjustment step will be reduced on this basis to obtain the next second actual speed. For example, the first real-time speed is recorded as N down , the speed adjustment step is still recorded as N a , the second actual speed is recorded as N n2 , then: N n2 = N down -m×N a , m is a natural number, indicating the number of adjustments.

[0037] In the above embodiment, when the photovoltaic air conditioning system is in an off-grid state with power outage, the photovoltaic air conditioning system is powered by the photovoltaic module. When the real-time output power of the photovoltaic module is less than the real-time power demand of the air conditioning load, the compensation speed is determined according to the power deviation between the real-time output power and the real-time power demand, the target speed is determined according to the compensation speed and the speed setting, and the speed adjustment step is obtained according to the compensation speed. Finally, the compressor is controlled according to the speed adjustment step and the target speed. On the one hand, the target speed is determined according to the power supply and demand, and the compressor is controlled with the target speed, so that the operation of the air conditioner can follow the change of the power supply and demand, avoiding the loss of step or shutdown of the air conditioner operation due to the mismatch between supply and demand, and improving the operation stability of the air conditioner. On the other hand, the speed adjustment step is dynamically determined according to the compensation speed, and the compensation speed is dynamically determined according to the power deviation, and the power deviation is dynamically determined according to the real-time power demand of the air conditioning load and the real-time output power of the photovoltaic module. Since the real-time power demand of the air conditioning load and the real-time output power of the photovoltaic module are usually non-fixed values, the speed adjustment step finally determined is also a non-fixed value. Based on the non-fixed speed adjustment step, the speed of the air-conditioning compressor is adjusted dynamically and step by step, so that the speed of the air-conditioning compressor can adapt to the changes in different working conditions of the photovoltaic air-conditioning system, effectively solving the problem of unstable air-conditioning operation caused by sudden changes in the demand power of the air-conditioning load and / or the output power of the photovoltaic module.

[0038] Figure 2 The flowchart of the second embodiment of the control method of the photovoltaic air conditioning system of the present invention is shown. In this embodiment, the photovoltaic air conditioning system includes a photovoltaic module and an air conditioner, and the air conditioner can be powered by the power grid and / or the photovoltaic module. When the photovoltaic air conditioning system is off-grid and the real-time output power of the photovoltaic module is less than the real-time required power of the air conditioning load, the air conditioner is controlled by the control method of the above embodiment. Moreover, during the control process, the speed used to determine the target speed is given as a variable value, and is a dynamically variable value that follows the temperature, humidity and the speed of the fan of the air conditioner indoor unit.

[0039] Specifically, the speed setting is determined by the following process.

[0040] S21: Acquire the real-time temperature and real-time humidity of the indoor environment where the photovoltaic air-conditioning system is located and the real-time fan speed of the indoor unit in the photovoltaic air-conditioning system.

[0041] S22: Determine the real-time effective temperature index according to the real-time temperature, the real-time humidity and the real-time fan speed. The specific determination method is not limited and can be implemented by using relevant technologies.

[0042] S23: Obtain the difference between the given effective temperature index and the real-time effective temperature index as the effective temperature index deviation, wherein the given effective temperature index is known.

[0043] S24: Process the effective temperature deviation to obtain the speed setting.

[0044] The speed setting changes with the change of the effective temperature deviation, and this embodiment does not limit the specific determination method.

[0045] In some embodiments, a proportional-integral process is performed on the effective temperature deviation to obtain a given speed.

[0046] By determining the real-time effective temperature index according to the real-time temperature, real-time humidity and real-time fan speed, and determining the speed setting based on the real-time effective temperature index, so that the speed setting matches the real-time condition of the indoor environment, and then determining the target speed of the compressor according to the speed setting, and controlling the compressor to operate at the target speed, it can adapt to the real-time indoor environment and improve the comfort of the air conditioner in regulating the indoor environment.

[0047] Figure 3 The schematic diagram of the structure of an embodiment of the control device of the photovoltaic air conditioning system of the present invention is shown. In this embodiment, the photovoltaic air conditioning system includes a photovoltaic module and an air conditioner, and the air conditioner can be powered by a power grid and / or a photovoltaic module. The control device of this embodiment includes structural units, functions of the structural units, and relationships between them, as follows: The control device includes: The real-time output power acquisition unit 31 of the photovoltaic module is used to acquire the real-time output power of the photovoltaic module in the photovoltaic air-conditioning system.

[0048] The real-time required power acquisition unit 32 of the air-conditioning load is used to acquire the real-time required power of the air-conditioning load in the photovoltaic air-conditioning system.

[0049] The control unit 33 is configured to execute the following control process when the photovoltaic air conditioning system is in an off-grid state and the real-time output power of the photovoltaic assembly obtained by the real-time output power acquisition unit 31 of the photovoltaic assembly is less than the real-time required power of the air conditioning load obtained by the real-time required power acquisition unit 32 of the air conditioning load: The difference between the real-time required power of the air conditioning load and the real-time output power of the photovoltaic module is obtained as the power deviation; Process the power deviation to obtain the speed for compensation; The difference between the given speed and the compensation speed is obtained as the target speed; the compensation speed is processed to obtain the speed adjustment step; Get the real-time speed of the air-conditioning compressor and compare it with the target speed; When the real-time speed is less than or equal to the target speed, the real-time speed is used as the base speed, the speed adjustment step is used to increase the real-time speed to obtain a first actual speed, and the air-conditioning compressor is controlled to operate at the first actual speed until the first actual speed increases to the target speed; When the real-time speed is greater than the target speed, the real-time speed is used as the base speed, and the speed adjustment step is used to reduce the real-time speed to obtain a second actual speed. The air-conditioning compressor is controlled to operate at the second actual speed until the second actual speed is reduced to the target speed.

[0050] The control device of the above structure runs the corresponding software program and performs the corresponding functions according to Figure 1 The photovoltaic air conditioning system is controlled by the control method embodiment and the process of other embodiments to achieve the same Figure 1 The corresponding technical effects of the embodiment and other embodiments.

[0051] The control device of the above-mentioned embodiment is applied to a photovoltaic air-conditioning system, which can improve the continuous operation stability of the photovoltaic air-conditioning system and ensure the use of the air-conditioning system.

[0052] Another embodiment of the present invention further provides a computer storage medium, on which a computer program is stored, and when the computer program is executed by a processor, Figure 1 Example Figure 2 The control method of the photovoltaic air-conditioning system of the embodiment or other embodiments can achieve the technical effects of the corresponding embodiments.

[0053] The above-mentioned computer storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. Computer storage media can be any available storage media that can be accessed by general or special-purpose computers.

[0054] In some embodiments, a computer storage medium is coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the storage medium can also exist in the device as discrete components.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A control method for a photovoltaic air conditioning system, characterized in that: The control method comprises: Obtain the real-time output power of the photovoltaic components in the photovoltaic air-conditioning system and the real-time required power of the air-conditioning load; When the photovoltaic air conditioning system is in an off-grid state and the real-time output power of the photovoltaic module is less than the real-time required power of the air conditioning load, the following control process is performed: Obtaining a difference between the real-time required power of the air-conditioning load and the real-time output power of the photovoltaic module as a power deviation; Processing the power deviation to obtain a rotation speed for compensation; The difference between the given speed and the compensation speed is obtained as the target speed; the compensation speed is processed to obtain the speed adjustment step length; Obtaining the real-time speed of the air-conditioning compressor and comparing it with the target speed; When the real-time speed is less than or equal to the target speed, taking the real-time speed as the base speed, increasing the real-time speed by using the speed adjustment step to obtain a first actual speed, and controlling the operation of the air-conditioning compressor by using the first actual speed until the first actual speed increases to the target speed; When the real-time speed is greater than the target speed, the real-time speed is taken as the base speed and the speed adjustment step is used to reduce the real-time speed to obtain a second actual speed, and the air-conditioning compressor is controlled to operate at the second actual speed until the second actual speed is reduced to the target speed.

2. The control method of the photovoltaic air conditioning system according to claim 1, characterized in that: Processing the power deviation to obtain a compensation speed specifically includes: Proportional integration processing is performed on the power deviation to obtain the compensation rotation speed.

3. The control method of the photovoltaic air conditioning system according to claim 1, characterized in that: The compensation speed is processed to obtain a speed adjustment step, specifically including: Performing a proportional operation or a proportional integral operation on the compensation speed to obtain an operation result; The calculation result is limited to obtain the rotation speed adjustment step.

4. The control method of the photovoltaic air conditioning system according to any one of claims 1 to 3, characterized in that: The speed setting is determined by the following process: Obtain the real-time temperature and humidity of the indoor environment where the photovoltaic air-conditioning system is located and the real-time fan speed of the indoor unit in the photovoltaic air-conditioning system; Determine a real-time effective temperature index according to the real-time temperature, the real-time humidity and the real-time fan speed; Obtaining a difference between a given effective temperature index and the real-time effective temperature index as an effective temperature index deviation; The effective temperature deviation is processed to obtain the rotational speed setting.

5. The control method of the photovoltaic air conditioning system according to claim 4, characterized in that: Processing the effective temperature deviation to obtain the speed setting specifically includes: The effective temperature deviation is processed by proportional integration to obtain the speed setting.

6. A control device for a photovoltaic air conditioning system, characterized in that: The control device comprises: A real-time output power acquisition unit of a photovoltaic module, used to acquire the real-time output power of a photovoltaic module in a photovoltaic air-conditioning system; The real-time power demand acquisition unit of the air-conditioning load is used to acquire the real-time power demand of the air-conditioning load in the photovoltaic air-conditioning system; The control unit is configured to execute the following control process when the photovoltaic air conditioning system is in an off-grid state and the real-time output power of the photovoltaic assembly is less than the real-time required power of the air conditioning load: Obtaining a difference between the real-time required power of the air-conditioning load and the real-time output power of the photovoltaic module as a power deviation; Processing the power deviation to obtain a rotation speed for compensation; The difference between the given speed and the compensation speed is obtained as the target speed; the compensation speed is processed to obtain the speed adjustment step length; Obtaining the real-time speed of the air-conditioning compressor and comparing it with the target speed; When the real-time speed is less than or equal to the target speed, taking the real-time speed as the base speed, increasing the real-time speed by using the speed adjustment step to obtain a first actual speed, and controlling the operation of the air-conditioning compressor by using the first actual speed until the first actual speed increases to the target speed; When the real-time speed is greater than the target speed, the real-time speed is taken as the base speed and the speed adjustment step is used to reduce the real-time speed to obtain a second actual speed, and the air-conditioning compressor is controlled to operate at the second actual speed until the second actual speed is reduced to the target speed.

7. The control device of the photovoltaic air conditioning system according to claim 6, characterized in that: The control unit processes the compensation speed to obtain the speed adjustment step, specifically including: Performing a proportional operation or a proportional integral operation on the compensation speed to obtain an operation result; The calculation result is limited to obtain the rotation speed adjustment step.

8. The control device of the photovoltaic air conditioning system according to claim 6 or 7, characterized in that: The speed setting is determined by the following process: Obtain the real-time temperature and humidity of the indoor environment where the photovoltaic air-conditioning system is located and the real-time fan speed of the indoor unit in the photovoltaic air-conditioning system; Determine a real-time effective temperature index according to the real-time temperature, the real-time humidity and the real-time fan speed; Obtaining a difference between a given effective temperature index and the real-time effective temperature index as an effective temperature index deviation; The effective temperature deviation is processed to obtain the rotational speed setting.

9. A photovoltaic air conditioning system, comprising a photovoltaic module and an air conditioner, characterized in that: The photovoltaic air-conditioning system further comprises a control device for the photovoltaic air-conditioning system according to any one of claims 6 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the photovoltaic air-conditioning system according to any one of claims 1 to 5 is implemented.

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