Photovoltaic air conditioning system and control method and device thereof, storage medium and program product

Abstract

The invention discloses a photovoltaic air conditioning system and a control method and device thereof, a storage medium and a computer program product, the photovoltaic air conditioning system comprises a photovoltaic module and an air conditioning system, the air conditioning system is provided with a controller component and a load component, and an on-off device is arranged between the controller component and the load component; the method comprises the steps that after the photovoltaic module generates power, the controller part is powered on, and under the condition that the controller part receives a startup instruction, the solar irradiance of the photovoltaic module is acquired; and according to the solar irradiance of the photovoltaic module, the on-off of the on-off device is controlled, and the operation power of the load component is controlled. According to the scheme, whether the air conditioning system is powered on or not and the running power under the powered-on condition are controlled according to the solar irradiance on the photovoltaic module, the situation that the air conditioning system is frequently started and stopped due to the change of the photovoltaic power generation power of the photovoltaic module is avoided, and the running reliability and user experience of the air conditioning system are improved.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning system technology, specifically relating to a control method, device, photovoltaic air conditioning system, storage medium, and computer program product for a photovoltaic air conditioning system, and particularly to a control method, device, photovoltaic air conditioning system, storage medium, and computer program product for an off-grid photovoltaic air conditioning system without battery power supply. Background Technology

[0002] Photovoltaic air conditioning systems, as a new energy source, have become increasingly sophisticated and widely used. In remote areas without power grids or on isolated islands, photovoltaic air conditioning systems offer users a superior comfort experience, making them a popular choice. Additionally, due to the high cost of battery systems, some users opt for battery-free photovoltaic air conditioning systems. However, in practical applications, the intensity of photovoltaic power varies significantly in the morning and evening. Off-grid photovoltaic air conditioning systems without battery power may experience a mismatch between photovoltaic power generation and the power demand of the air conditioning system, leading to frequent start-ups and shutdowns. Repeated start-ups and shutdowns over a long period can affect the lifespan of related components and parts of the air conditioning system, thus impacting overall reliability and user experience.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a control method, device, system, storage medium, and computer program product for a photovoltaic air conditioning system. This addresses the problem of mismatch between photovoltaic power generation and the power demand of the air conditioning system (such as off-grid systems without battery power) due to fluctuating photovoltaic intensity, leading to frequent start-stop cycles. Repeated start-stop cycles can negatively impact the lifespan of related components and parts, affecting overall system reliability and user experience. The invention aims to control the power supply and operating power of the air conditioning system based on the solar irradiance of the photovoltaic modules, thereby preventing frequent start-stop cycles caused by fluctuations in photovoltaic power generation and improving the system's reliability and user experience.

[0005] This invention provides a control method for a photovoltaic air conditioning system. The photovoltaic air conditioning system includes a photovoltaic module and an air conditioning system. The air conditioning system has a controller component and a load component, and a switching device is provided between the controller component and the load component. The control method for the photovoltaic air conditioning system includes: when the controller component is energized after the photovoltaic module generates electricity and the controller component receives a start-up command, acquiring the solar irradiance of the photovoltaic module; controlling the opening and closing of the switching device according to the solar irradiance of the photovoltaic module, and controlling the operating power of the load component.

[0006] In some embodiments, controlling the opening and closing of the switching device and controlling the operating power of the load component based on the solar irradiance of the photovoltaic module includes: determining whether the switching device is closed or open; if it is determined that the switching device is open, controlling the opening and closing of the switching device based on the solar irradiance of the photovoltaic module; if it is determined that the switching device is closed, determining the photovoltaic power generation of the photovoltaic module based on the solar irradiance of the photovoltaic module; and controlling the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module.

[0007] In some embodiments, controlling the opening and closing of the switching device based on the solar irradiance of the photovoltaic module includes: determining whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of a preset solar irradiance range; if the solar irradiance of the photovoltaic module is determined to be greater than or equal to the minimum value of the preset solar irradiance range, then controlling the switching device to close, and then returning to re-determine whether the switching device is closed; if the solar irradiance of the photovoltaic module is determined to be less than the minimum value of the preset solar irradiance range, then keeping the switching device open, and then returning to re-determine whether the switching device is closed; and / or, determining the photovoltaic power generation of the photovoltaic module based on the solar irradiance of the photovoltaic module includes: determining the photovoltaic power generation of the photovoltaic module as the product of the solar irradiance of the photovoltaic module, a predetermined total area of ​​the photovoltaic panels of the photovoltaic module, and a predetermined efficiency of the photovoltaic module.

[0008] In some implementations, controlling the operating power of the load component based on the solar irradiance and photovoltaic power generation of the photovoltaic module includes: determining whether the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of a preset solar irradiance range, and determining whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current demand power of the load component, i.e., the first demand power of the load component, which is calculated based on the current and voltage of the load component; if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of the preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the first demand power of the load component, then the switching device is kept closed, the load component is controlled to operate at the first demand power of the load component, and the maximum operating power of the load component when operating at the first demand power of the load component is not additionally limited, and then the process is repeated to re-determine whether the switching device is closed.

[0009] In some embodiments, controlling the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module further includes: when it is determined that the solar irradiance of the photovoltaic module is less than the maximum value of a preset solar irradiance range, and / or it is determined that the photovoltaic power generation of the photovoltaic module is less than the first required power of the load component, determining whether the solar irradiance of the photovoltaic module is greater than or equal to a preset first solar irradiance within the preset solar irradiance range, and determining whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the second required power of the load component, wherein the second required power of the load component is calculated based on the currently acquired current and voltage of the load component; the preset first solar irradiance within the preset solar irradiance range If the solar irradiance of the photovoltaic module is greater than or equal to the preset first solar irradiance within the preset solar irradiance range and less than the maximum value of the preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the second demand power of the load component and less than the first demand power of the load component, then the switching device remains closed, the load component is controlled to operate at the second demand power of the load component, and the maximum operating power of the load component when operating at the second demand power of the load component is further limited to less than a preset first power threshold, and the preset first power threshold is less than a preset maximum operating power threshold of the load component, and then the process returns to re-determine whether the switching device is closed.

[0010] In some embodiments, controlling the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module further includes: when it is determined that the solar irradiance of the photovoltaic module is less than a preset first solar irradiance within a preset solar irradiance range, and / or it is determined that the photovoltaic power generation of the photovoltaic module is less than a second required power of the load component, determining whether the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range, and determining whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the third required power of the load component, wherein the third required power of the load component is calculated based on the currently acquired current and voltage of the load component; the preset second solar irradiance within the preset solar irradiance range is less than the preset first solar irradiance within the preset solar irradiance range; the preset first solar irradiance within the preset solar irradiance range... The irradiance is less than the maximum value of a preset solar irradiance range; the third required power of the load component is less than the second required power of the load component; the second required power of the load component is less than the first required power of the load component; if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range and less than a preset first solar irradiance within a preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the third required power of the load component and less than the second required power of the load component, then the switching device remains closed, the load component is controlled to operate at the third required power of the load component, and the maximum operating power of the load component when operating at the third required power of the load component is further limited to less than a preset second power threshold, and the preset second power threshold is less than a preset first power threshold, then the process returns to re-determine whether the switching device is closed; the preset first power threshold is less than a preset maximum operating power threshold.

[0011] In some embodiments, controlling the operating power of the load component based on the solar irradiance and photovoltaic power generation of the photovoltaic module further includes: when it is determined that the solar irradiance of the photovoltaic module is less than a preset second solar irradiance within a preset solar irradiance range, and / or it is determined that the photovoltaic power generation of the photovoltaic module is less than a third required power of the load component, determining whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of a preset solar irradiance range, and determining whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the fourth required power of the load component, wherein the fourth required power of the load component is calculated based on the currently acquired current and voltage of the load component; a preset first solar irradiance within a preset solar irradiance range is less than the maximum value of a preset solar irradiance range; a preset second solar irradiance within a preset solar irradiance range is less than the preset first solar irradiance within a preset solar irradiance range; a preset second solar irradiance within a preset solar irradiance range is greater than the minimum value of a preset solar irradiance range; and the second required power of the load component is less than... The load component has a first required power; a third required power, which is less than the second required power; and a third required power, which is greater than the fourth required power. If the solar irradiance of the photovoltaic module is determined to be greater than or equal to the minimum value of a preset solar irradiance range and less than a preset second solar irradiance within the preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is determined to be greater than or equal to the fourth required power of the load component and less than the third required power, then the switching device remains closed, and the load component is controlled to operate at a preset minimum power threshold. Afterward, the process returns to re-determine whether the switching device is closed. The preset minimum power threshold is less than a preset second power threshold, the preset second power threshold is less than a preset first power threshold, and the preset first power threshold is less than a preset maximum operating power threshold. If the solar irradiance of the photovoltaic module is determined to be less than the minimum value of a preset solar irradiance range, and / or the photovoltaic power generation of the photovoltaic module is determined to be less than the fourth required power of the load component, then the load component is controlled to shut down, and the switching device is controlled to open. Afterward, the process returns to re-determine whether the switching device is closed.

[0012] In conjunction with the above method, another aspect of the present invention provides a control device for a photovoltaic air conditioning system. The photovoltaic air conditioning system includes a photovoltaic module and an air conditioning system. The air conditioning system has a controller component and a load component, and a switching device is provided between the controller component and the load component. The control device for the photovoltaic air conditioning system includes: an acquisition unit configured to acquire the solar irradiance of the photovoltaic module when the controller component is energized after the photovoltaic module generates electricity and the controller component receives a start-up command; and a control unit configured to control the opening and closing of the switching device and control the operating power of the load component according to the solar irradiance of the photovoltaic module.

[0013] In some embodiments, the control unit controls the opening and closing of the switching device and the operating power of the load component based on the solar irradiance of the photovoltaic module, including: determining whether the switching device is closed or open; if the switching device is determined to be open, controlling the opening and closing of the switching device based on the solar irradiance of the photovoltaic module; if the switching device is determined to be closed, determining the photovoltaic power generation of the photovoltaic module based on the solar irradiance of the photovoltaic module; and controlling the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module.

[0014] In some embodiments, the control unit controls the opening and closing of the switching device based on the solar irradiance of the photovoltaic module, including: determining whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of a preset solar irradiance range; if the solar irradiance of the photovoltaic module is determined to be greater than or equal to the minimum value of the preset solar irradiance range, then controlling the switching device to close, and then returning to re-determine whether the switching device is closed; if the solar irradiance of the photovoltaic module is determined to be less than the minimum value of the preset solar irradiance range, then keeping the switching device open, and then returning to re-determine whether the switching device is closed; and / or, the control unit determines the photovoltaic power generation of the photovoltaic module based on the solar irradiance of the photovoltaic module, including: determining the photovoltaic power generation of the photovoltaic module as the product of the solar irradiance of the photovoltaic module, a predetermined total area of ​​the photovoltaic panels of the photovoltaic module, and a predetermined efficiency of the photovoltaic module.

[0015] In some embodiments, the control unit controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module, including: determining whether the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of a preset solar irradiance range, and determining whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current demand power of the load component, i.e., the first demand power of the load component, wherein the first demand power of the load component is calculated based on the current and voltage of the load component currently obtained; if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of the preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the first demand power of the load component, then the switching device is kept closed, the load component is controlled to operate at the first demand power of the load component, and the maximum operating power of the load component when operating at the first demand power of the load component is not additionally limited, and then the process returns to re-determine whether the switching device is closed.

[0016] In some embodiments, the control unit, which controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module, further includes: when it is determined that the solar irradiance of the photovoltaic module is less than the maximum value of a preset solar irradiance range, and / or when it is determined that the photovoltaic power generation of the photovoltaic module is less than the first required power of the load component, determining whether the solar irradiance of the photovoltaic module is greater than or equal to a preset first solar irradiance within the preset solar irradiance range, and determining whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the second required power of the load component, wherein the second required power of the load component is calculated based on the currently acquired current and voltage of the load component; the preset first solar irradiance within the preset solar irradiance range If the solar irradiance of the photovoltaic module is greater than or equal to the preset first solar irradiance within the preset solar irradiance range and less than the maximum value of the preset solar irradiance range, and if the photovoltaic power generation of the photovoltaic module is greater than or equal to the second required power of the load component and less than the first required power of the load component, then the switching device remains closed, the load component is controlled to operate at the second required power of the load component, and the maximum operating power of the load component when operating at the second required power of the load component is further limited to less than a preset first power threshold, and the preset first power threshold is less than a preset maximum operating power threshold of the load component, and then the process returns to re-determine whether the switching device is closed.

[0017] In some embodiments, the control unit, which controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module, further includes: when it is determined that the solar irradiance of the photovoltaic module is less than a preset first solar irradiance within a preset solar irradiance range, and / or it is determined that the photovoltaic power generation of the photovoltaic module is less than a second required power of the load component, determining whether the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range, and determining whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the third required power of the load component, wherein the third required power of the load component is calculated based on the currently acquired current and voltage of the load component; the preset second solar irradiance within the preset solar irradiance range is less than the preset first solar irradiance within the preset solar irradiance range; the preset first solar irradiance within the preset solar irradiance range... The solar irradiance is less than the maximum value of a preset solar irradiance range; the third required power of the load component is less than the second required power of the load component; the second required power of the load component is less than the first required power of the load component; if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range and less than a preset first solar irradiance within a preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the third required power of the load component and less than the second required power of the load component, then the switching device remains closed, the load component is controlled to operate at the third required power of the load component, and the maximum operating power of the load component when operating at the third required power of the load component is further limited to less than a preset second power threshold, and the preset second power threshold is less than a preset first power threshold, then the process returns to re-determine whether the switching device is closed; the preset first power threshold is less than a preset maximum operating power threshold.

[0018] In some embodiments, the control unit, which controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module, further includes: determining whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range, and determining whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the third required power of the load component, when it is determined that the solar irradiance of the photovoltaic module is less than a preset second solar irradiance range, and / or when it is determined that the photovoltaic power generation of the photovoltaic module is less than a third required power of the load component. The current power requirement of the load component is the fourth power requirement of the load component, which is calculated based on the current and voltage of the load component. The preset first solar irradiance within the preset solar irradiance range is less than the maximum value of the preset solar irradiance range; the preset second solar irradiance within the preset solar irradiance range is less than the preset first solar irradiance within the preset solar irradiance range; the preset second solar irradiance within the preset solar irradiance range is greater than the minimum value of the preset solar irradiance range; the second power requirement of the load component. The solar irradiance of the photovoltaic module is less than the first required power of the load component; the third required power of the load component is less than the second required power of the load component; the third required power of the load component is greater than the fourth required power of the load component; if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range and less than the preset second solar irradiance within the preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the fourth required power of the load component and less than the third required power of the load component, then the switching device is kept closed, the load component is controlled to operate at a preset minimum power threshold, and then the process is repeated to re-determine whether the switching device is closed; the preset minimum power threshold is less than the preset second power threshold, the preset second power threshold is less than the preset first power threshold, and the preset first power threshold is less than the preset maximum operating power threshold; if it is determined that the solar irradiance of the photovoltaic module is less than the minimum value of the preset solar irradiance range, and / or it is determined that the photovoltaic power generation of the photovoltaic module is less than the fourth required power of the load component, then the load component is controlled to stop, and the switching device is controlled to open, and then the process is repeated to re-determine whether the switching device is closed.

[0019] In conjunction with the above-mentioned device, the present invention further provides a photovoltaic air conditioning system, including: the control device for the photovoltaic air conditioning system described above.

[0020] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the steps of the control method for the photovoltaic air conditioning system described above.

[0021] In conjunction with the above method, the present invention further provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method for the photovoltaic air conditioning system described above.

[0022] Therefore, the solution of this invention, for off-grid photovoltaic air conditioning systems without battery power, involves installing an irradiance detection device (such as an irradiance sensor) on the photovoltaic modules and an on / off device (such as a relay switch K1) between the photovoltaic air conditioning controller and the photovoltaic air conditioning load. After the photovoltaic modules generate electricity to power the photovoltaic air conditioning controller, the photovoltaic air conditioning controller controls the opening or closing of the on / off device based on the solar irradiance (such as solar irradiance G) detected by the irradiance detection device on the photovoltaic modules, and controls the maximum operating power of the photovoltaic air conditioning load. Thus, by controlling whether the air conditioning system is powered and its operating power when powered based on the solar irradiance on the photovoltaic modules, the frequent start-stop of the air conditioning system due to fluctuations in the photovoltaic power generation of the photovoltaic modules is avoided, improving the operational reliability of the air conditioning system and the user experience.

[0023] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0024] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0025] Figure 1 This is a flowchart illustrating an embodiment of the control method for the photovoltaic air conditioning system of the present invention; Figure 2 This is a schematic flowchart of an embodiment of the method of the present invention for controlling the opening and closing of the switching device and the operating power of the load component; Figure 3 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the opening and closing of the switching device; Figure 4 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the operation of the load component without limiting the maximum operating power; Figure 5 This is a flowchart illustrating an embodiment of the method of the present invention for controlling the operation of the load component and limiting the maximum operating power to less than a preset first power threshold; Figure 6 This is a flowchart illustrating an embodiment of the method of the present invention, which controls the operation of the load component and limits the maximum operating power to a preset second power threshold and the preset second power threshold to a preset first power threshold. Figure 7 This is a schematic flowchart of an embodiment of the method of the present invention, which controls the load component to operate at a preset minimum power threshold and then returns to re-determine whether the on / off device is closed. Figure 8 This is a schematic diagram of the structure of a control device for a photovoltaic air conditioning system according to an embodiment of the present invention; Figure 9 A structural block diagram of an off-grid photovoltaic air conditioning system without battery power supply; Figure 10 A schematic diagram of the circuit topology of an off-grid photovoltaic air conditioning system without battery power supply; Figure 11 A flowchart illustrating a control method for an off-grid photovoltaic air conditioning system without battery power.

[0026] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows: 102 - Acquisition unit; 104 - Control unit. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] Considering that the intensity of solar photovoltaic (PV) power varies, solar air conditioning systems (such as off-grid systems without battery power) may experience a mismatch between PV power generation and the system's power requirements, leading to frequent start-ups and shutdowns. Repeated start-ups and shutdowns over a long period can affect the lifespan of related components and parts, thus impacting overall reliability and user experience. Specifically, for off-grid solar air conditioning systems without battery power, during periods when solar power gradually increases in intensity (from zero to strong in the morning) or weakens in the evening, the system cannot determine whether the current PV power output meets the minimum power requirements for operation. If the system starts during these periods, the insufficient PV power may cause load components to shut down. Furthermore, during cloudy or rainy weather, PV power generation can change abruptly or fluctuate. If the system fails to detect these changes in PV power in a timely manner, a mismatch between the system's operating power and the PV power output may occur, leading to load component shutdowns.

[0029] Therefore, the present invention proposes a control method for a photovoltaic air conditioning system, specifically a control method for an off-grid photovoltaic air conditioning system without battery power. In the off-grid photovoltaic air conditioning system without battery power, an irradiance sensor is added to estimate the photovoltaic power generation of the photovoltaic modules in real time. The control logic of the air conditioning system is adjusted according to the photovoltaic power generation of the photovoltaic modules to solve the problem of frequent shutdowns of the off-grid photovoltaic air conditioning system without battery power caused by sudden changes in photovoltaic power generation, which at least greatly improves the user experience.

[0030] According to embodiments of the present invention, a control method for a photovoltaic air conditioning system is provided, such as... Figure 1 The diagram shows a flowchart of an embodiment of the method of the present invention. The photovoltaic air conditioning system can be applied to off-grid scenarios without battery power supply; the photovoltaic air conditioning system includes photovoltaic modules and an air conditioning system, the air conditioning system having a controller component and a load component, and an on / off device is provided between the controller component and the load component. The controller component of the air conditioning system is as follows: Figure 9 and Figure 10 The photovoltaic air conditioner controller shown, the load components of the photovoltaic air conditioner are as follows: Figure 9 and Figure 10 The photovoltaic air conditioning load shown, the on / off device is as follows Figure 10 The relay switch K1 shown; in the solution of the present invention, as Figure 1 As shown, the control method of the photovoltaic air conditioning system includes steps S110 to S120.

[0031] In step S110, when the controller component is energized after the photovoltaic module generates electricity and the controller component receives a power-on command, the solar irradiance of the photovoltaic module is acquired; specifically, when the controller component is energized after the photovoltaic module generates electricity and the controller component receives a power-on command for turning on the load component, the solar irradiance of the photovoltaic module is acquired; wherein, the solar irradiance of the photovoltaic module is, for example, the solar irradiance G detected by the irradiance sensor installed on the photovoltaic module.

[0032] In step S120, the opening and closing of the switching device is controlled according to the solar irradiance of the photovoltaic module, and the operating power of the load component is controlled.

[0033] Figure 9 This is a structural block diagram of an off-grid photovoltaic air conditioning system that is not powered by batteries. (Example:) Figure 9The diagram illustrates an off-grid, battery-free photovoltaic (PV) air conditioning system, primarily comprising PV modules, an irradiance sensor, a PV air conditioning controller, and PV air conditioning loads. The output of the PV modules is connected to the first input of the PV air conditioning controller, the output of the irradiance sensor is connected to the second input of the PV air conditioning controller, and the output of the PV air conditioning controller is connected to the input of the PV air conditioning loads. In this off-grid, battery-free PV air conditioning system, the PV modules provide power to the entire system. The PV air conditioning controller simultaneously controls the boosting of the PV voltage of the PV modules to the corresponding bus voltage range and controls the operation of other loads within the air conditioning system (such as the PV air conditioning loads). The PV air conditioning loads mainly include indoor fans, outdoor fans, compressors, temperature sensors, and irradiance sensors.

[0034] Figure 10 This is a schematic diagram of the circuit topology of an off-grid photovoltaic air conditioning system without battery power. (Example:) Figure 10 The circuit topology of an off-grid photovoltaic air conditioning system without battery power supply shown mainly includes photovoltaic modules, a boost circuit main topology for the photovoltaic air conditioning controller, and photovoltaic air conditioning loads. Figure 10 In the example shown, an irradiance sensor is added to sample the solar radiation energy of the photovoltaic system to obtain the solar radiation power, estimate the photovoltaic power generation of the photovoltaic module, and then control it according to the corresponding control logic.

[0035] The installation location of the irradiance sensor: The irradiance sensor is usually installed as an accessory or on a bracket of the photovoltaic module; preferably, the irradiance sensor should be installed at the same tilt angle and azimuth angle as the photovoltaic module. For example, if the azimuth angle of the photovoltaic module is facing south and the tilt angle of the photovoltaic module is 30 degrees, then the irradiance sensor should also be installed at an azimuth angle of facing south and a tilt angle of 30 degrees. At the same time, it should be ensured that the installation location of the irradiance sensor is free from shadows throughout the day.

[0036] Installation of the irradiance sensor: When installing the irradiance sensor, choose a stable location on the end bracket of the photovoltaic module. Use tools to fix the irradiance sensor to the crossbeam of the end bracket of the photovoltaic module, with the sensing surface of the irradiance sensor facing upwards. It should be firmly fixed to the end bracket of the photovoltaic module to prevent loosening. Then, use an inclinometer to adjust the tilt angle of the irradiance sensor to match the tilt angle of the photovoltaic module (e.g., the tilt angle of the photovoltaic module is 30 degrees); and use a level to ensure that the azimuth angle of the irradiance sensor is facing south. Furthermore, the cable of the irradiance sensor needs to be connected to a waterproof junction box to avoid exposure to rain. Run the cable of the irradiance sensor along the end bracket of the photovoltaic module and secure it with wire ties. The irradiance sensor is mainly used to collect parameters related to solar radiation energy, such as solar radiation intensity. The main parameter collected by the irradiance sensor is the solar power received per unit area of ​​the sensor, and the unit of solar power is W (watts) per square meter.

[0037] exist Figure 10 In the example shown, the main topology of the boost circuit of the photovoltaic air conditioner controller includes inductor L1, power device IGBT1, diodes VD1 and VD2, capacitor C1, and relay switch K1. Relay switch K1 is initially in the open state. When IGBT1 is a MOSFET, the first connection terminal of the photovoltaic module's output is connected to the anode of diode VD2. The cathode of diode VD2 is connected to the drain of IGBT1 and the anode of diode VD1 via inductor L1. The cathode of diode VD1 is connected to the positive terminal of capacitor C1, which is also connected to the first connection terminal of the relay switch K1's contacts. The second connection terminal of the relay switch K1's contacts is connected to the power consumption terminal of the photovoltaic air conditioner load, and the ground terminal of the photovoltaic air conditioner load is grounded. The second connection terminal of the photovoltaic module's output is connected to the source of IGBT1 and the negative terminal of capacitor C1; the negative terminal of capacitor C1 is grounded.

[0038] The system comprises an inductor L1, a power device IGBT1, and a diode VD1 forming a boost circuit. The unidirectional conductivity of diode VD2 ensures that the photovoltaic module can only output current. Capacitor C1 stores electrical energy. Relay switch K1 controls the connection and disconnection of the load. The photovoltaic module provides power to the entire air conditioning system; the boost circuit, consisting of inductor L1, IGBT1, and diode VD1, boosts the output voltage VPV of the photovoltaic module to the DC bus voltage VDC1, supplying power to the photovoltaic air conditioning load and ensuring the normal operation of the air conditioning system. The DC bus voltage VDC1 ranges from 360V to 420V, and the output voltage VPV of the photovoltaic module ranges from 200V to 350V.

[0039] The present invention addresses the mismatch between photovoltaic power generation and air conditioning system power demand in the morning or evening by adding an irradiance sensor to estimate the photovoltaic power generation of photovoltaic modules in real time in off-grid photovoltaic air conditioning systems without battery power. Combined with corresponding control logic, such as adjusting the control logic of the air conditioning system according to the photovoltaic power generation of photovoltaic modules, the solution improves the overall reliability and enhances the user experience.

[0040] In some embodiments, the specific process of controlling the opening and closing of the switching device and controlling the operating power of the load component according to the solar irradiance of the photovoltaic module in step S120 is described in the following exemplary description.

[0041] The following is combined with Figure 2 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention for controlling the opening and closing of the switching device and the operating power of the load component. It further illustrates the specific process of controlling the opening and closing of the switching device and the operating power of the load component in step S120, including steps S210 to S230.

[0042] Step S210: Determine whether the switching device is closed, i.e., determine whether the switching device is closed or open; when the switching device is closed, the power supply path between the controller component and the load component is connected; when the switching device is open, the power supply path between the controller component and the load is disconnected.

[0043] Step S220: If it is determined that the switching device is disconnected, the opening and closing of the switching device is controlled according to the solar irradiance of the photovoltaic module.

[0044] In step S230, if it is determined that the switching device is closed, the photovoltaic power generation of the photovoltaic module is determined according to the solar irradiance of the photovoltaic module; and the operating power of the load component is controlled according to the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module.

[0045] The present invention addresses the application scenario of off-grid photovoltaic air conditioning systems without battery power supply by proposing a corresponding control scheme that adds an irradiance sensor detection circuit. This scheme uses the irradiance sensor to detect solar radiation power in real time, estimating the photovoltaic power generation capacity and providing reasonable and effective photovoltaic power generation parameters for startup control before and stable operation control after startup. This effectively solves the problem of frequent shutdowns of off-grid photovoltaic air conditioning systems without battery power supply caused by sudden changes in photovoltaic power generation, greatly improving the user experience, resulting in good performance and high overall reliability.

[0046] For example, before adding an irradiance sensor, it was impossible to determine in the morning or evening whether the power generation of the photovoltaic panels in the solar modules met the minimum operating power of the air conditioning system (i.e., the minimum power required for the air conditioning system to operate). If the power generation of the photovoltaic panels did not meet the minimum operating power of the air conditioning system, directly starting the air conditioning system after receiving the start-up command would cause the load components to shut down, leading to frequent start-stop cycles. After adding the irradiance sensor, it is possible to determine whether the power generation of the photovoltaic panels meets the minimum operating power of the air conditioning system. Upon receiving the start-up command, if it is determined that the power generation of the photovoltaic panels meets the minimum operating power of the air conditioning system, the air conditioning system is allowed to start. If it is determined that the power generation of the photovoltaic panels does not meet the minimum operating power of the air conditioning system, the air conditioning system is not allowed to start. This avoids the frequent start-stop cycles of the air conditioning system, which would lead to a poor user experience. Therefore, the control method and control logic after adding the irradiance sensor solves the problem of frequent air conditioning system starts and improves the user experience.

[0047] In some embodiments, in step S220, when it is determined that the switching device is disconnected, the specific process of controlling the opening and closing of the switching device according to the solar irradiance of the photovoltaic module is described in the following exemplary description.

[0048] The following is combined with Figure 3 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention for controlling the opening and closing of the switching device. It further illustrates the specific process of controlling the opening and closing of the switching device in step S220, including steps S310 to S330.

[0049] Step S310: If the on / off device is determined to be off, determine whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range; wherein, the minimum value of the preset solar irradiance range is such as the solar irradiance threshold Gth1.

[0050] Step S320: If it is determined that the switching device is open, and if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range, then control the switching device to close, and then return to re-determine whether the switching device is closed.

[0051] Step S330: If it is determined that the switching device is open, and if it is determined that the solar irradiance of the photovoltaic module is less than the minimum value of the preset solar irradiance range, then the switching device remains open, and then the process is repeated to re-determine whether the switching device is closed.

[0052] Figure 11 This is a flowchart illustrating a control method for an off-grid photovoltaic air conditioning system without battery power. Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply includes: Step 1: As the morning sunlight gradually intensifies, the photovoltaic modules begin to generate electricity. Once the photovoltaic air conditioning controller in the air conditioning system is powered on, proceed to Step 2.

[0053] Of course, in step 1, the relay switch K1 between the photovoltaic air conditioning controller and the photovoltaic air conditioning load in the photovoltaic air conditioning system can be opened by default. In the morning, as the sunlight gradually increases, the photovoltaic modules start to generate electricity. When the photovoltaic air conditioning controller in the air conditioning system is powered on, the photovoltaic air conditioning controller keeps the relay switch K1 open to keep the relay switch K1 between the photovoltaic air conditioning controller and the photovoltaic air conditioning load in the photovoltaic air conditioning system open, and then proceed to step 2.

[0054] Step 2: After the photovoltaic air conditioner controller is powered on, it reads the solar irradiance G in real time through the irradiance sensor. At the same time, the photovoltaic air conditioner controller determines whether the command used to control the air conditioning system is a power-on command. If so, it executes step 3; otherwise, it returns to step 2 to continue waiting in step 2.

[0055] Solar irradiance is the solar radiation power received per unit area, and its unit is W / m². Solar radiation power is the total solar radiation energy received by the entire photovoltaic module, and its unit is W. Solar radiation energy is the total solar radiation energy received per unit area over a period of time, and its unit is kWh (kilowatt-hours) / m².

[0056] Step 3: When the received command for controlling the air conditioning system is a power-on command, determine whether relay switch K1 is engaged. If not, proceed to step 4; otherwise, proceed to step 5. The engagement or disengagement of relay K1 is controlled by a command issued by the program. The program internally determines whether relay switch K1 is engaged by judging this command.

[0057] Step 4: Determine whether the solar irradiance G ≥ solar irradiance threshold 1 (e.g., solar irradiance threshold Gth1): If the solar irradiance G ≥ solar irradiance threshold Gth1 is not satisfied, disconnect relay switch K1, and then return to step 3 to re-loop the judgment; if the solar irradiance G ≥ solar irradiance threshold Gth1 is satisfied, close relay switch K1, and then return to step 3 to re-loop the judgment.

[0058] In the solution of this invention, during the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance in real time through the irradiance sensor and compares it with the solar irradiance threshold. Based on the comparison results, the operating logic of the air conditioning system is adjusted. By reading the solar irradiance in real time, the power generation can be estimated and the changes in power generation can be quickly identified. Based on the changes in power generation, it is decided whether to limit the operating power of the air conditioning system, thereby avoiding frequent shutdowns, improving the overall reliability of the machine, and enhancing the user experience.

[0059] In some embodiments, step S230, determining the photovoltaic power generation of the photovoltaic module based on the solar irradiance of the photovoltaic module, includes: determining the photovoltaic power generation of the photovoltaic module as the product of the solar irradiance of the photovoltaic module, the predetermined total area of ​​the photovoltaic panels of the photovoltaic module, and the predetermined efficiency of the photovoltaic module.

[0060] During the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance in real time through an irradiance sensor. The photovoltaic power generation of the photovoltaic modules is estimated based on the solar irradiance readings from the sensor, using the formula: Photovoltaic power generation = Solar irradiance * Total area of ​​photovoltaic panels * Photovoltaic power generation efficiency. In cloudy or rainy weather, the photovoltaic power generation of the photovoltaic modules may experience sudden changes or fluctuations, leading to a mismatch between the air conditioning system's operating power and the photovoltaic power generation. By reading the solar irradiance in real time, the power generation can be estimated, allowing for rapid identification of power generation changes. Based on these changes, it can be determined whether to limit the operating power of the air conditioning system, thereby avoiding frequent shutdowns.

[0061] In some embodiments, step S230, when it is determined that the switching device is closed, controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module, including: controlling the operation of the load component without limiting the maximum operating power.

[0062] The following is combined with Figure 4 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention for controlling the operation of the load component without limiting the maximum operating power. It further illustrates the specific process of controlling the operation of the load component without limiting the maximum operating power in step S230, including steps S410 to S420.

[0063] Step S410: When it is determined that the switching device is closed, determine whether the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of the preset solar irradiance range, and determine whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current demand power of the load component, i.e., the first demand power of the load component. The first demand power of the load component is the demand power of the load component calculated based on the current and voltage of the load component currently obtained; wherein, the maximum value of the preset solar irradiance range is, for example, the solar irradiance threshold Gth4.

[0064] Step S420: If, when it is determined that the switching device is closed, the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the first required power of the load component, then the switching device remains closed, and the load component is controlled to operate at the first required power of the load component without additionally limiting the maximum operating power of the load component when operating at the first required power of the load component. Then, the process returns to re-determine whether the switching device is closed. Specifically, if, when it is determined that the switching device is closed, the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the first required power of the load component, then the switching device remains closed, and the load component is controlled to operate at the first required power of the load component without additionally limiting the maximum operating power of the load component when operating at the first required power of the load component. Then, the process returns to re-determine whether the switching device is closed. If the irradiance is greater than or equal to the maximum value of a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is determined to be greater than or equal to the first required power of the load component, then the switching device remains closed. The load component is controlled to operate according to the set operating mode received by the controller component, and the load component is controlled to operate according to its current required power. That is, the operating power of the load component is controlled to be the same as the current required power of the load component as determined by the controller component, without additionally limiting the preset maximum operating power threshold when the load component operates at its current required power. Then, the process returns to re-determine whether the switching device is closed. The power-on command can be a user-sent command, and the set operating mode can be a user-sent target operating mode.

[0065] like Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply further includes: Step 5: When relay switch K1 is energized, the off-grid photovoltaic air conditioning system without battery power starts and runs according to the control logic of the air conditioning system. During the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance G in real time through the irradiance sensor, and then executes step 6.

[0066] During the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance G in real time through the irradiance sensor. The photovoltaic power generation of the photovoltaic module is estimated based on the solar irradiance G collected by the irradiance sensor. The estimation formula for the photovoltaic power generation of the photovoltaic module based on the solar irradiance G is: Photovoltaic power generation = Solar irradiance G * Area of ​​all photovoltaic panels in the photovoltaic module * Efficiency of the photovoltaic module.

[0067] For example, if the power requirement for an air conditioning system to operate freely under mains power conditions is 1500W during a certain period, and the estimated photovoltaic (PV) power generation is 1100W-1200W, which is less than 1500W, then the PV module's power generation does not match the air conditioning system's power requirement. The PV module's power generation cannot support the 1500W power requirement for the air conditioning system to operate. To prevent the load components from shutting down, a power limit of Pmax2 = 1000W needs to be added. When the air conditioning system's operating power is determined to be greater than or equal to Pmax2, the air conditioning system operates at a reduced frequency, such as 4Hz / 10s, until the actual operating power of the entire air conditioning system is less than 1000W. This ensures that the PV module's power generation is greater than or equal to the air conditioning system's operating power, ensuring that the air conditioning system does not shut down. The air conditioning system's operating power can be calculated in real time using relevant voltage, current, and other parameters. In the present invention, the sampled value of solar irradiance G is used to determine the photovoltaic power generation power of 1100W~1200W in the above example, which is also estimated by solar irradiance G. Of course, the photovoltaic power generation power of 1100W~1200W is just an example value.

[0068] Step 6: Determine whether the solar irradiance G ≥ solar irradiance threshold Gth4 and the current photovoltaic power generation power ≥ the current air conditioning load power as the first required power of the load component: if yes, proceed to step 61; otherwise, proceed to step 7.

[0069] Step 61: When the solar irradiance G ≥ solar irradiance threshold Gth4 and the current photovoltaic power generation power ≥ the current air conditioning load power as the first required power of the load component, keep the relay switch K1 closed, control the air conditioning system to operate according to the air conditioning system's operating logic, and do not additionally limit the maximum operating power of the air conditioning system, then return to step 3 to re-loop and judge.

[0070] When the solar irradiance G ≥ solar irradiance threshold Gth4 and the current photovoltaic power generation power ≥ the current air conditioning load power as the first required power of the load component, it indicates that the photovoltaic power generation power of the photovoltaic module is sufficient and the air conditioning system can operate freely according to demand; if the user needs, the air conditioning system can also operate at the maximum operating power of the air conditioning system.

[0071] In some embodiments, step S230, when it is determined that the switching device is closed, controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module, further includes: controlling the operation of the load component and limiting the maximum operating power to be less than a preset first power threshold.

[0072] The following is combined with Figure 5 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention, which controls the operation of the load component and limits the maximum operating power to less than a preset first power threshold. It further illustrates the specific process of controlling the operation of the load component and limiting the maximum operating power to less than the preset first power threshold in step S230, including steps S510 to S520.

[0073] Step S510: When it is determined that the switching device is closed, and when it is determined that the solar irradiance of the photovoltaic module is less than the maximum value of the preset solar irradiance range, and / or when it is determined that the photovoltaic power generation of the photovoltaic module is less than the first required power of the load component, it is determined whether the solar irradiance of the photovoltaic module is greater than or equal to the preset first solar irradiance within the preset solar irradiance range, and whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the second required power of the load component. The second required power of the load component is calculated based on the current and voltage of the load component. The preset first solar irradiance within the preset solar irradiance range is less than the maximum value of the preset solar irradiance range; the second required power of the load component is less than the first required power of the load component. Wherein, the maximum value of the preset solar irradiance range is such as the solar irradiance threshold Gth4, and the preset first solar irradiance is such as the solar irradiance threshold Gth3.

[0074] Step S520: If, when it is determined that the switching device is closed, the photovoltaic module's solar irradiance is greater than or equal to a preset first solar irradiance within a preset solar irradiance range and less than the maximum value within a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the second required power of the load component and less than the first required power of the load component, then the switching device remains closed, the load component is controlled to operate at the second required power of the load component, and the maximum operating power of the load component operating at the second required power is further limited to less than a preset first power threshold, and the preset first power threshold is less than the preset maximum operating power threshold of the load component. Then, the process returns to re-determine whether the switching device is closed. Specifically, when it is determined that the switching device is closed, if the photovoltaic module's solar irradiance is greater than or equal to a preset first solar irradiance within a preset solar irradiance range and less than the maximum value within a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the second required power of the load component and less than the first required power of the load component, then the process returns to re-determine whether the switching device is closed. If the solar irradiance is greater than or equal to a preset first solar irradiance within a preset solar irradiance range, and less than the maximum value within the preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is determined to be greater than or equal to the second required power of the load component, and less than the first required power of the load component, then the switching device remains closed. The load component is controlled to operate according to the set operating mode received by the controller component, and the load component is controlled to operate according to its current required power. That is, the operating power of the load component is controlled to be the same as the current required power of the load component as determined by the controller component. Additionally, the maximum operating power of the load component operating at its second required power is limited to be less than a preset first power threshold, and the preset first power threshold is less than a preset maximum operating power threshold of the load component. Then, the process returns to re-determine whether the switching device is closed. The preset first power threshold is, for example, the maximum operating power limit threshold Pmax2 of an air conditioning system.

[0075] like Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply further includes: Step 7: Determine whether the following conditions are met: solar irradiance threshold Gth3 ≤ solar irradiance G < solar irradiance threshold Gth4, and the first required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power as the second required power of the load component. If yes, proceed to step 71; otherwise, proceed to step 8.

[0076] Step 71: When the solar irradiance threshold Gth3 ≤ solar irradiance G < solar irradiance threshold Gth4, and the first required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power as the second required power of the load component, keep the relay switch K1 closed, control the air conditioning system to operate according to the air conditioning system's operating logic, increase the maximum operating power limit threshold Pmax2 of the air conditioning system, and denote the operating power of the air conditioning system as P. Then, the operating power of the air conditioning system P < the maximum operating power limit threshold Pmax2 of the air conditioning system, and then return to step 3 to re-loop and judge.

[0077] For example, when the operating power of the air conditioning system is determined to be greater than or equal to Pmax2, the air conditioning system operates at a reduced frequency, such as 4Hz / 10s; this continues until the actual operating power of the entire air conditioning system is less than 1000W, ensuring that the photovoltaic power generation of the photovoltaic modules is greater than or equal to the operating power of the air conditioning system, thus ensuring that the air conditioning system does not shut down. The operating power of the air conditioning system can include the operating power of the compressor, outdoor fan, indoor fan, and various sensors in the photovoltaic air conditioning load.

[0078] When photovoltaic (PV) power generation is sufficient, there is no need to limit the operating power of the air conditioning system; therefore, there is no maximum operating power limit for the air conditioning system. When PV power generation is insufficient, the maximum operating power of the air conditioning system needs to be limited, and thus, an increased power limit is imposed. The description "increased" is relative to the situation where there is no limit when PV power generation is sufficient. The maximum operating power limit threshold Pmax2 for the air conditioning system is the maximum operating power limit value for the air conditioning system, representing the upper limit of power under this condition. By increasing the maximum operating power limit value for the air conditioning system, such as the maximum operating power limit threshold Pmax2, it is ensured that the PV power generation is sufficient to supply the actual operating power of the air conditioning system, avoiding frequent shutdowns of the air conditioning system caused by a mismatch between the PV power generation of the PV modules and the power consumption of the air conditioning system.

[0079] In some embodiments, step S230, when it is determined that the switching device is closed, controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module, further includes: controlling the operation of the load component and limiting the maximum operating power to be less than a preset second power threshold and the preset second power threshold to be less than a preset first power threshold.

[0080] The following is combined with Figure 6The schematic diagram shows an embodiment of the method of the present invention, which controls the operation of the load component and limits the maximum operating power to a preset second power threshold and the preset second power threshold to a preset first power threshold. It further illustrates the specific process of controlling the operation of the load component and limiting the maximum operating power to a preset second power threshold and the preset second power threshold to a preset first power threshold in step S230, including steps S610 to S620.

[0081] Step S610: If the on / off device is determined to be closed, and if the solar irradiance of the photovoltaic module is determined to be less than a preset first solar irradiance within a preset solar irradiance range, and / or if the photovoltaic power generation of the photovoltaic module is determined to be less than the second required power of the load component, then determine whether the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range, and determine whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the third required power of the load component. The third required power of the load component is based on the currently obtained... The required power of the load component is calculated from the current and voltage of the load component; a preset second solar irradiance within a preset solar irradiance range is less than a preset first solar irradiance within the preset solar irradiance range; the preset first solar irradiance within a preset solar irradiance range is less than the maximum value of the preset solar irradiance range; the third required power of the load component is less than the second required power of the load component; the second required power of the load component is less than the first required power of the load component; wherein, the preset second solar irradiance is like a solar irradiance threshold Gth2, and the preset first solar irradiance is like a solar irradiance threshold Gth3.

[0082] Step S620: If, when it is determined that the switching device is closed, the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range and less than a preset first solar irradiance within a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the third required power of the load component and less than the second required power of the load component, then the switching device remains closed, the load component is controlled to operate at the third required power of the load component, and the maximum operating power of the load component when operating at the third required power is further limited to less than a preset second power threshold and the preset second power threshold is less than a preset first power threshold. Then, the process returns to re-determine whether the switching device is closed. Specifically, when it is determined that the switching device is closed, if the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range and less than a preset first solar irradiance within a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the third required power of the load component and less than the second required power of the load component, then the process returns to re-determine whether the switching device is closed. If the solar irradiance is greater than or equal to a preset second solar irradiance within a preset solar irradiance range, and less than a preset first solar irradiance within a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is determined to be greater than or equal to the third required power of the load component, and less than the second required power of the load component, then the switching device remains closed. The load component is controlled to operate according to the set operating mode received by the controller component, and the load component is controlled to operate according to its current required power, i.e., the operating power of the load component is controlled to be the same as the current required power of the load component as determined by the controller component. Furthermore, the maximum operating power of the load component operating at its third required power is limited to a preset second power threshold, and the preset second power threshold is less than a preset first power threshold. Then, the process returns to re-determine whether the switching device is closed. The preset first power threshold is less than a preset maximum operating power threshold; the preset second power threshold is, for example, the maximum operating power limit threshold Pmax1 of an air conditioning system.

[0083] like Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply further includes: Step 8: Determine whether the following conditions are met: solar irradiance threshold Gth2 ≤ solar irradiance G < solar irradiance threshold Gth3, and the second required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power as well as the third required power of the load component. If yes, proceed to step 81; otherwise, proceed to step 9.

[0084] Step 81: When the solar irradiance threshold Gth2 ≤ solar irradiance G < solar irradiance threshold Gth3, and the second required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power (e.g., the third required power of the load component), keep the relay switch K1 closed, control the air conditioning system to operate according to the air conditioning system's operating logic, increase the maximum operating power limit of the air conditioning system (e.g., the maximum operating power limit threshold Pmax1), and denote the operating power of the air conditioning system as P. Then, P < the maximum operating power limit threshold Pmax1. After that, return to step 3 for a new loop judgment. The maximum operating power limit thresholds Pmax1 and Pmax2 of the air conditioning system are both maximum operating power thresholds of the air conditioning system, and the maximum operating power limit threshold Pmax2 > the maximum operating power limit threshold Pmax1.

[0085] Increase the maximum operating power limit of the air conditioning system, such as the maximum operating power limit threshold Pmax1, to ensure that the photovoltaic power generation of the photovoltaic modules is sufficient to supply the actual operating power of the air conditioning system, and avoid the frequent shutdown of the air conditioning system caused by the mismatch between the photovoltaic power generation of the photovoltaic modules and the power consumption of the air conditioning system.

[0086] In some implementations, step S230, when it is determined that the switching device is closed, controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module, and further includes: controlling the load component to operate at a preset minimum power threshold, and then returning to re-determine whether the switching device is closed.

[0087] The following is combined with Figure 7 The schematic diagram of an embodiment of the method of the present invention, which controls the load component to operate at a preset minimum power threshold and then returns to re-determine whether the switching device is closed, further illustrates the specific process of controlling the load component to operate at a preset minimum power threshold and then returning to re-determine whether the switching device is closed in step S230, including steps S710 to S730.

[0088] Step S710: If the switching device is closed, and if the solar irradiance of the photovoltaic module is less than a preset second solar irradiance within a preset solar irradiance range, and / or the photovoltaic power generation of the photovoltaic module is less than the third required power of the load component, determine whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range, and determine whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the fourth required power of the load component. The fourth required power of the load component is calculated based on the currently acquired current and voltage of the load component; within the preset solar irradiance range... A first solar irradiance is preset, which is less than the maximum value of a preset solar irradiance range; a second solar irradiance within the preset solar irradiance range is less than the first solar irradiance within the preset solar irradiance range; a second solar irradiance within the preset solar irradiance range is greater than the minimum value of the preset solar irradiance range; a second required power of the load component is less than the first required power of the load component; a third required power of the load component is less than the second required power of the load component; a third required power of the load component is greater than the fourth required power of the load component; wherein, the minimum value of the preset solar irradiance range is such as a solar irradiance threshold Gth1, and the second solar irradiance is such as a solar irradiance threshold Gth2.

[0089] Step S720: If, when it is determined that the switching device is closed, the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range and less than the preset second solar irradiance within the preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the fourth required power of the load component and less than the third required power of the load component, then the switching device remains closed, and the load component is controlled to operate at a preset minimum power threshold. Then, the process returns to re-determine whether the switching device is closed. The preset minimum power threshold is less than the preset second power threshold, the preset second power threshold is less than the preset first power threshold, and the preset first power threshold is less than the preset maximum operating power threshold.

[0090] Step S730: If, when it is determined that the switching device is closed, the solar irradiance of the photovoltaic module is less than the minimum value of the preset solar irradiance range, and / or the photovoltaic power generation of the photovoltaic module is less than the fourth required power of the load component, then the load component is controlled to stop, and the switching device is controlled to open. Then the process returns to re-determine whether the switching device is closed.

[0091] like Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply further includes: Step 9: Determine whether the following conditions are met: solar irradiance threshold Gth1 ≤ solar irradiance G < solar irradiance threshold Gth2, and the third required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power as the fourth required power of the load component. If yes, proceed to step 91; otherwise, proceed to step 10.

[0092] Step 91: When the solar irradiance threshold Gth1 ≤ solar irradiance G < solar irradiance threshold Gth2, and the third required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power (e.g., the fourth required power of the load component), keep the relay switch K1 closed, and control the air conditioning system to operate at the minimum operating power of the air conditioning system (e.g., the minimum operating power limit threshold Pmin). Then return to step 3 for a new loop judgment. The minimum operating power limit threshold Pmin of the air conditioning system is 300W~350W, the maximum operating power limit threshold Pmax1 is 800W~850W, and the maximum operating power limit threshold Pmax2 is 1200W~1250W.

[0093] Increase the maximum operating power limit of the air conditioning system, such as the minimum operating power limit threshold Pmin, to ensure that the photovoltaic power generation is sufficient to supply the actual operating power of the air conditioning system, and avoid the frequent shutdown of the air conditioning system caused by the mismatch between the photovoltaic power generation of the photovoltaic modules and the power consumption of the air conditioning system.

[0094] Step 10: When the solar irradiance G < solar irradiance threshold Gth1, the load component shuts down and relay switch K1 opens. When the photovoltaic power generation of the photovoltaic module does not meet the power requirement for the minimum power operation of the air conditioning system, the load component shuts down and disconnects the load, then the relay switch K1 is re-evaluated to determine whether it is engaged, and this cycle repeats.

[0095] Wherein, solar irradiance G is the solar irradiance read in real time by the irradiance sensor; solar irradiance threshold Gth1 is solar irradiance threshold 1; solar irradiance threshold Gth2 is solar irradiance threshold 2; solar irradiance threshold Gth3 is solar irradiance threshold 3; and solar irradiance threshold Gth4 is solar irradiance threshold 4, and Gth4 ≥ Gth3 ≥ Gth2 ≥ Gth1. When G = Gth4, it indicates that the photovoltaic power generation is sufficient to meet the maximum operating power requirement of the air conditioning system; when G = Gth3, it indicates that the photovoltaic power generation is relatively large, but does not meet the maximum operating power requirement of the air conditioning system; when G = Gth2, it indicates that the photovoltaic power generation is relatively small, which can meet the small load operation of the air conditioning system; and when G = Gth1, it indicates that the photovoltaic power generation is very small, which can only meet the minimum power operation of the air conditioning system. Taking four photovoltaic panels, each with an area of ​​2.5 square meters, an irradiance of 1000W / square meter per panel, and a photovoltaic module efficiency of 20% as an example, Gth1 = 150 W / square meter ~ 200 W / square meter; Gth2 = 400 W / square meter ~ 450 W / square meter; Gth3 = 600 W / square meter ~ 650 W / square meter; Gth4 = 800 W / square meter ~ 850 W / square meter.

[0096] In the solution of this invention, during the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance in real time through an irradiance sensor and compares it with the solar irradiance threshold. Based on the comparison results, the operating logic of the air conditioning system is adjusted. During cloudy or rainy weather, the photovoltaic power generation of the photovoltaic modules may suddenly change or fluctuate, leading to a mismatch between the operating power of the air conditioning system and the photovoltaic power generation. By reading the solar irradiance in real time, the power generation can be estimated and changes in power generation can be quickly identified. Based on the changes in power generation, it is decided whether to limit the operating power of the air conditioning system, thereby avoiding frequent shutdowns, improving the overall reliability of the system, enhancing the user experience, and achieving good results.

[0097] The technical solution of this embodiment addresses off-grid photovoltaic air conditioning systems without battery power by installing an irradiance detection device (such as an irradiance sensor) on the photovoltaic modules and setting up a switching device (such as a relay switch K1) between the photovoltaic air conditioning controller and the photovoltaic air conditioning load. After the photovoltaic modules generate electricity to power the photovoltaic air conditioning controller, the controller controls the opening or closing of the switching device based on the solar irradiance (such as solar irradiance G) detected by the irradiance detection device on the photovoltaic modules, and controls the maximum operating power of the photovoltaic air conditioning load. Thus, by controlling whether the air conditioning system is powered and its operating power when powered based on the solar irradiance on the photovoltaic modules, the frequent start-stop of the air conditioning system due to fluctuations in the photovoltaic power generation of the photovoltaic modules is avoided, improving the operational reliability of the air conditioning system and the user experience.

[0098] According to embodiments of the present invention, a control device for a photovoltaic air conditioning system corresponding to a control method for a photovoltaic air conditioning system is also provided. See also Figure 8 The diagram shows a structural schematic of an embodiment of the device of the present invention. The photovoltaic air conditioning system can be applied to off-grid scenarios without battery power supply; the photovoltaic air conditioning system includes photovoltaic modules and an air conditioning system, the air conditioning system having a controller component and a load component, and an on / off device is provided between the controller component and the load component. The controller component of the air conditioning system is as follows: Figure 9 and Figure 10 The photovoltaic air conditioner controller shown, the load components of the photovoltaic air conditioner are as follows: Figure 9 and Figure 10 The photovoltaic air conditioning load shown, the on / off device is as follows Figure 10 The relay switch K1 shown; in the solution of the present invention, as Figure 8 As shown, the control device of the photovoltaic air conditioning system includes: an acquisition unit 102 and a control unit 104.

[0099] The acquisition unit 102 is configured to acquire the solar irradiance of the photovoltaic module when the controller component is energized after the photovoltaic module generates power and the controller component receives a power-on command; specifically, it acquires the solar irradiance of the photovoltaic module when the controller component is energized after the photovoltaic module generates power and the controller component receives a power-on command to start the load component; wherein the solar irradiance of the photovoltaic module is, for example, the solar irradiance G detected by an irradiance sensor installed on the photovoltaic module. The specific functions and processing of the acquisition unit 102 are described in step S110.

[0100] The control unit 104 is configured to control the opening and closing of the switching device and the operating power of the load component according to the solar irradiance of the photovoltaic module. The specific functions and processing of the control unit 104 are described in step S120.

[0101] Figure 9 This is a structural block diagram of an off-grid photovoltaic air conditioning system that is not powered by batteries. (Example:) Figure 9The diagram illustrates an off-grid, battery-free photovoltaic (PV) air conditioning system, primarily comprising PV modules, an irradiance sensor, a PV air conditioning controller, and PV air conditioning loads. The output of the PV modules is connected to the first input of the PV air conditioning controller, the output of the irradiance sensor is connected to the second input of the PV air conditioning controller, and the output of the PV air conditioning controller is connected to the input of the PV air conditioning loads. In this off-grid, battery-free PV air conditioning system, the PV modules provide power to the entire system. The PV air conditioning controller simultaneously controls the boosting of the PV voltage of the PV modules to the corresponding bus voltage range and controls the operation of other loads within the air conditioning system (such as the PV air conditioning loads). The PV air conditioning loads mainly include indoor fans, outdoor fans, compressors, temperature sensors, and irradiance sensors.

[0102] Figure 10 This is a schematic diagram of the circuit topology of an off-grid photovoltaic air conditioning system without battery power. (Example:) Figure 10 The circuit topology of an off-grid photovoltaic air conditioning system without battery power supply shown mainly includes photovoltaic modules, a boost circuit main topology for the photovoltaic air conditioning controller, and photovoltaic air conditioning loads. Figure 10 In the example shown, an irradiance sensor is added to sample the solar radiation energy of the photovoltaic system to obtain the solar radiation power, estimate the photovoltaic power generation of the photovoltaic module, and then control it according to the corresponding control logic.

[0103] exist Figure 10 In the example shown, the main topology of the boost circuit of the photovoltaic air conditioner controller includes inductor L1, power device IGBT1, diodes VD1 and VD2, capacitor C1, and relay switch K1. Relay switch K1 is initially in the open state. When IGBT1 is a MOSFET, the first connection terminal of the photovoltaic module's output is connected to the anode of diode VD2. The cathode of diode VD2 is connected to the drain of IGBT1 and the anode of diode VD1 via inductor L1. The cathode of diode VD1 is connected to the positive terminal of capacitor C1, which is also connected to the first connection terminal of the relay switch K1's contacts. The second connection terminal of the relay switch K1's contacts is connected to the power consumption terminal of the photovoltaic air conditioner load, and the ground terminal of the photovoltaic air conditioner load is grounded. The second connection terminal of the photovoltaic module's output is connected to the source of IGBT1 and the negative terminal of capacitor C1; the negative terminal of capacitor C1 is grounded.

[0104] The system comprises an inductor L1, a power device IGBT1, and a diode VD1 forming a boost circuit. The unidirectional conductivity of diode VD2 ensures that the photovoltaic module can only output current. Capacitor C1 stores electrical energy. Relay switch K1 controls the connection and disconnection of the load. The photovoltaic module provides power to the entire air conditioning system; the boost circuit, consisting of inductor L1, IGBT1, and diode VD1, boosts the output voltage VPV of the photovoltaic module to the DC bus voltage VDC1, supplying power to the photovoltaic air conditioning load and ensuring the normal operation of the air conditioning system. The DC bus voltage VDC1 ranges from 360V to 420V, and the output voltage VPV of the photovoltaic module ranges from 200V to 350V.

[0105] The present invention addresses the mismatch between photovoltaic power generation and air conditioning system power demand in the morning or evening by adding an irradiance sensor to estimate the photovoltaic power generation of photovoltaic modules in real time in off-grid photovoltaic air conditioning systems without battery power. Combined with corresponding control logic, such as adjusting the control logic of the air conditioning system according to the photovoltaic power generation of photovoltaic modules, the solution improves the overall reliability and enhances the user experience.

[0106] In some embodiments, the control unit 104 controls the opening and closing of the switching device and the operating power of the load component based on the solar irradiance of the photovoltaic module, including: The control unit 104 is further configured to determine whether the on / off device is closed, i.e., whether the on / off device is closed or open; when the on / off device is closed, the power supply path between the controller component and the load component is connected; when the on / off device is open, the power supply path between the controller component and the load is disconnected. The specific functions and processing of the control unit 104 are further described in step S210.

[0107] The control unit 104 is further configured to control the opening and closing of the switching device based on the solar irradiance of the photovoltaic module if it is determined that the switching device is open. The specific functions and processing of the control unit 104 are further described in step S220.

[0108] The control unit 104 is further configured to, if it is determined that the on / off device is closed, determine the photovoltaic power generation of the photovoltaic module based on the solar irradiance of the photovoltaic module; and control the operating power of the load component based on the solar irradiance and the photovoltaic power generation of the photovoltaic module. The specific functions and processing of this control unit 104 are further described in step S230.

[0109] The present invention addresses the application scenario of off-grid photovoltaic air conditioning systems without battery power supply by proposing a corresponding control scheme that adds an irradiance sensor detection circuit. This scheme uses the irradiance sensor to detect solar radiation power in real time, estimating the photovoltaic power generation capacity and providing reasonable and effective photovoltaic power generation parameters for startup control before and stable operation control after startup. This effectively solves the problem of frequent shutdowns of off-grid photovoltaic air conditioning systems without battery power supply caused by sudden changes in photovoltaic power generation, greatly improving the user experience, resulting in good performance and high overall reliability.

[0110] In some embodiments, the control unit 104, upon determining that the switching device is off, controls the opening and closing of the switching device based on the solar irradiance of the photovoltaic module, including: The control unit 104 is further configured to, when the on / off device is determined to be off, determine whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of a preset solar irradiance range; wherein the minimum value of the preset solar irradiance range is, for example, the solar irradiance threshold Gth1. The specific functions and processing of the control unit 104 are further described in step S310.

[0111] The control unit 104 is further configured to, when it is determined that the switching device is open, if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of a preset solar irradiance range, control the switching device to close, and then return to re-determine whether the switching device is closed. The specific functions and processing of this control unit 104 are also described in step S320.

[0112] The control unit 104 is further configured to, when it is determined that the switching device is open, if it is determined that the solar irradiance of the photovoltaic module is less than the minimum value of a preset solar irradiance range, then keep the switching device open and return to re-determine whether the switching device is closed; and / or, determine the photovoltaic power generation of the photovoltaic module based on the solar irradiance of the photovoltaic module, including: determining the photovoltaic power generation of the photovoltaic module as the product of the solar irradiance of the photovoltaic module, a predetermined total area of ​​the photovoltaic panels of the photovoltaic module, and a predetermined efficiency of the photovoltaic module. The specific functions and processing of this control unit 104 are also described in step S330.

[0113] Figure 11 This is a flowchart illustrating a control method for an off-grid photovoltaic air conditioning system without battery power. Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply includes: Step 1: As the morning sunlight gradually intensifies, the photovoltaic modules begin to generate electricity. Once the photovoltaic air conditioning controller in the air conditioning system is powered on, proceed to Step 2.

[0114] Of course, in step 1, the relay switch K1 between the photovoltaic air conditioning controller and the photovoltaic air conditioning load in the photovoltaic air conditioning system can be opened by default. In the morning, as the sunlight gradually increases, the photovoltaic modules start to generate electricity. When the photovoltaic air conditioning controller in the air conditioning system is powered on, the photovoltaic air conditioning controller keeps the relay switch K1 open to keep the relay switch K1 between the photovoltaic air conditioning controller and the photovoltaic air conditioning load in the photovoltaic air conditioning system open, and then proceed to step 2.

[0115] Step 2: After the photovoltaic air conditioner controller is powered on, it reads the solar irradiance G in real time through the irradiance sensor. At the same time, the photovoltaic air conditioner controller determines whether the command used to control the air conditioning system is a power-on command. If so, it executes step 3; otherwise, it returns to step 2 to continue waiting in step 2.

[0116] Step 3: When the received command for controlling the air conditioning system is a power-on command, determine whether the relay switch K1 is engaged: if not, proceed to step 4; if yes, proceed to step 5.

[0117] Step 4: Determine whether the solar irradiance G ≥ solar irradiance threshold 1 (e.g., solar irradiance threshold Gth1): If the solar irradiance G ≥ solar irradiance threshold Gth1 is not satisfied, disconnect relay switch K1, and then return to step 3 to re-loop the judgment; if the solar irradiance G ≥ solar irradiance threshold Gth1 is satisfied, close relay switch K1, and then return to step 3 to re-loop the judgment.

[0118] In the solution of this invention, during the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance in real time through the irradiance sensor and compares it with the solar irradiance threshold. Based on the comparison results, the operating logic of the air conditioning system is adjusted. By reading the solar irradiance in real time, the power generation can be estimated and the changes in power generation can be quickly identified. Based on the changes in power generation, it is decided whether to limit the operating power of the air conditioning system, thereby avoiding frequent shutdowns, improving the overall reliability of the machine, and enhancing the user experience.

[0119] In some embodiments, the control unit 104 determines the photovoltaic power generation of the photovoltaic module based on the solar irradiance of the photovoltaic module, including: the control unit 104 is further configured to determine the photovoltaic power generation of the photovoltaic module as the product of the solar irradiance of the photovoltaic module, a predetermined total area of ​​the photovoltaic panels of the photovoltaic module, and a predetermined efficiency of the photovoltaic module.

[0120] During the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance in real time through an irradiance sensor. The photovoltaic power generation of the photovoltaic modules is estimated based on the solar irradiance readings from the sensor, using the formula: Photovoltaic power generation = Solar irradiance * Total area of ​​photovoltaic panels * Photovoltaic power generation efficiency. In cloudy or rainy weather, the photovoltaic power generation of the photovoltaic modules may experience sudden changes or fluctuations, leading to a mismatch between the air conditioning system's operating power and the photovoltaic power generation. By reading the solar irradiance in real time, the power generation can be estimated, allowing for rapid identification of power generation changes. Based on these changes, it can be determined whether to limit the operating power of the air conditioning system, thereby avoiding frequent shutdowns.

[0121] In some embodiments, the control unit 104, upon determining that the on / off device is closed, controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module. This includes controlling the operation of the load component without limiting its maximum operating power, as detailed below: The control unit 104 is further configured to, when the on / off device is determined to be closed, determine whether the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of a preset solar irradiance range, and determine whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current demand power of the load component, i.e., the first demand power of the load component. The first demand power of the load component is calculated based on the current and voltage of the load component currently obtained; wherein, the maximum value of the preset solar irradiance range is, for example, the solar irradiance threshold Gth4. The specific functions and processing of this control unit 104 are further described in step S410.

[0122] The control unit 104 is further configured to, when the on / off device is determined to be closed, if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the first required power of the load component, then keep the on / off device closed, control the load component to operate at the first required power of the load component, and do not additionally limit the maximum operating power of the load component when operating at the first required power of the load component, and then return to re-determine whether the on / off device is closed; specifically, when the on / off device is determined to be closed, if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is greater than or equal to the first required power of the load component, then keep the on / off device closed, control the load component to operate at the first required power of the load component, and do not additionally limit the maximum operating power of the load component when operating at the first required power of the load component, ... If the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is determined to be greater than or equal to the first required power of the load component, then the switching device remains closed, and the load component is controlled to operate according to the set operating mode received by the controller component. The load component is controlled to operate according to its current required power, that is, the operating power of the load component is controlled to be the same as the current required power of the load component as determined by the controller component, without additionally limiting the maximum operating power of the load component when operating at its first required power. Then, the process returns to re-determine whether the switching device is closed. The specific functions and processing of this control unit 104 are also described in step S420.

[0123] like Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply further includes: Step 5: When relay switch K1 is energized, the off-grid photovoltaic air conditioning system without battery power starts and runs according to the control logic of the air conditioning system. During the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance G in real time through the irradiance sensor, and then executes step 6.

[0124] During the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance G in real time through the irradiance sensor. The photovoltaic power generation of the photovoltaic module is estimated based on the solar irradiance G collected by the irradiance sensor. The estimation formula for the photovoltaic power generation of the photovoltaic module based on the solar irradiance G is: Photovoltaic power generation = Solar irradiance G * Area of ​​all photovoltaic panels in the photovoltaic module * Efficiency of the photovoltaic module.

[0125] Step 6: Determine whether the solar irradiance G ≥ solar irradiance threshold Gth4 and the current photovoltaic power generation power ≥ the current air conditioning load power as the first required power of the load component: if yes, proceed to step 61; otherwise, proceed to step 7.

[0126] Step 61: When the solar irradiance G ≥ solar irradiance threshold Gth4 and the current photovoltaic power generation power ≥ the current air conditioning load power as the first required power of the load component, keep the relay switch K1 closed, control the air conditioning system to operate according to the air conditioning system's operating logic, and do not additionally limit the maximum operating power of the air conditioning system, then return to step 3 to re-loop and judge.

[0127] When the solar irradiance G ≥ solar irradiance threshold Gth4 and the current photovoltaic power generation power ≥ the current air conditioning load power as the first required power of the load component, it indicates that the photovoltaic power generation power of the photovoltaic module is sufficient and the air conditioning system can operate freely according to demand; if the user needs, the air conditioning system can also operate at the maximum operating power of the air conditioning system.

[0128] In some embodiments, the control unit 104, upon determining that the on / off device is closed, controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module. The control unit further includes a process of controlling the operation of the load component and limiting the maximum operating power to less than a preset first power threshold, as detailed below: The control unit 104 is further configured to, when the on / off device is closed, and when the solar irradiance of the photovoltaic module is less than the maximum value of a preset solar irradiance range, and / or when the photovoltaic power generation of the photovoltaic module is less than the first required power of the load component, determine whether the solar irradiance of the photovoltaic module is greater than or equal to a preset first solar irradiance within a preset solar irradiance range, and determine whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the second required power of the load component. The second required power of the load component is calculated based on the currently acquired current and voltage of the load component. The preset first solar irradiance within the preset solar irradiance range is less than the maximum value of the preset solar irradiance range; the second required power of the load component is less than the first required power of the load component. Wherein, the maximum value of the preset solar irradiance range is, for example, a solar irradiance threshold Gth4, and the preset first solar irradiance is, for example, a solar irradiance threshold Gth3. The specific functions and processing of this control unit 104 are further described in step S510.

[0129] The control unit 104 is further configured to, when the on / off device is determined to be closed, if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to a preset first solar irradiance within a preset solar irradiance range and less than the maximum value of the preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the second required power of the load component and less than the first required power of the load component, then keep the on / off device closed, control the load component to operate at the second required power of the load component, and additionally limit the maximum operating power of the load component to be less than a preset first power threshold, and the preset first power threshold is less than a preset maximum operating power threshold of the load component, and then return to re-determine whether the on / off device is closed; specifically, when the on / off device is determined to be closed, if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to a preset first solar irradiance within a preset solar irradiance range and less than the maximum value of the preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the second required power of the load component and less than the first required power of the load component, ... If the solar irradiance of the photovoltaic module is greater than or equal to a preset first solar irradiance within a preset solar irradiance range, and less than the maximum value within the preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is determined to be greater than or equal to the second required power of the load component, and less than the first required power of the load component, then the switching device remains closed. The load component is controlled to operate according to the set operating mode received by the controller component, and the load component is controlled to operate according to its current required power. That is, the operating power of the load component is controlled to be the same as the current required power of the load component as determined by the controller component. Additionally, the maximum operating power of the load component operating at its second required power is limited to less than a preset first power threshold, and the preset first power threshold is less than a preset maximum operating power threshold of the load component. Then, the process returns to re-determine whether the switching device is closed. The preset first power threshold is, for example, the maximum operating power limit threshold Pmax2 of an air conditioning system. The specific functions and processing of this control unit 104 are also described in step S520.

[0130] like Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply further includes: Step 7: Determine whether the following conditions are met: solar irradiance threshold Gth3 ≤ solar irradiance G < solar irradiance threshold Gth4, and the first required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power as the second required power of the load component. If yes, proceed to step 71; otherwise, proceed to step 8.

[0131] Step 71: When the solar irradiance threshold Gth3 ≤ solar irradiance G < solar irradiance threshold Gth4, and the first required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power as the second required power of the load component, keep the relay switch K1 closed, control the air conditioning system to operate according to the air conditioning system's operating logic, increase the maximum operating power limit threshold Pmax2 of the air conditioning system, and denote the operating power of the air conditioning system as P. Then, the operating power of the air conditioning system P < the maximum operating power limit threshold Pmax2 of the air conditioning system, and then return to step 3 to re-loop and judge.

[0132] When photovoltaic (PV) power generation is sufficient, there is no need to limit the operating power of the air conditioning system; therefore, there is no maximum operating power limit for the air conditioning system. When PV power generation is insufficient, the maximum operating power of the air conditioning system needs to be limited, and thus, an increased power limit is imposed. The description "increased" is relative to the situation where there is no limit when PV power generation is sufficient. The maximum operating power limit threshold Pmax2 for the air conditioning system is the maximum operating power limit value for the air conditioning system, representing the upper limit of power under this condition. By increasing the maximum operating power limit value for the air conditioning system, such as the maximum operating power limit threshold Pmax2, it is ensured that the PV power generation is sufficient to supply the actual operating power of the air conditioning system, avoiding frequent shutdowns of the air conditioning system caused by a mismatch between the PV power generation of the PV modules and the power consumption of the air conditioning system.

[0133] In some embodiments, the control unit 104, upon determining that the on / off device is closed, controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module. The control unit further includes a process of controlling the operation of the load component and limiting the maximum operating power to be less than a preset second power threshold, and the preset second power threshold being less than a preset first power threshold. Specifically, the process is as follows: The control unit 104 is further configured to, when the on / off device is closed, and when the solar irradiance of the photovoltaic module is less than a preset first solar irradiance within a preset solar irradiance range, and / or when the photovoltaic power generation of the photovoltaic module is less than the second required power of the load component, determine whether the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range, and determine whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the third required power of the load component, wherein the third required power of the load component is based on the current... The required power of the load component is calculated from the current and voltage of the load component; a preset second solar irradiance within a preset solar irradiance range is less than a preset first solar irradiance within the preset solar irradiance range; the preset first solar irradiance within the preset solar irradiance range is less than the maximum value of the preset solar irradiance range; the third required power of the load component is less than the second required power of the load component; the second required power of the load component is less than the first required power of the load component; wherein, the preset second solar irradiance is like a solar irradiance threshold Gth2, and the preset first solar irradiance is like a solar irradiance threshold Gth3. The specific functions and processing of this control unit 104 are further described in step S610.

[0134] The control unit 104 is further configured to, when the on / off device is determined to be closed, if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range and less than a preset first solar irradiance within a preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the third required power of the load component and less than the second required power of the load component, then keep the on / off device closed, control the load component to operate at the third required power of the load component, and additionally limit the maximum operating power of the load component when operating at the third required power of the load component to be less than a preset second power threshold and the preset second power threshold is less than a preset first power threshold, and then return to re-determine whether the on / off device is closed; specifically, when the on / off device is determined to be closed, if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range and less than a preset first solar irradiance within a preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the third required power of the load component and less than the second required power of the load component, ...... If the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range, and less than a preset first solar irradiance within a preset solar irradiance range, and the photovoltaic power generation of the photovoltaic module is determined to be greater than or equal to a third required power of the load component, and less than a second required power of the load component, then the switching device remains closed. The load component is controlled to operate according to the set operating mode received by the controller component, and the load component is controlled to operate according to its current required power, i.e., the operating power of the load component is controlled to be the same as the current required power of the load component as determined by the controller component. Furthermore, the maximum operating power of the load component operating at its third required power is limited to a preset second power threshold, and the preset second power threshold is less than a preset first power threshold. Then, the process returns to re-determine whether the switching device is closed. The preset first power threshold is less than a preset maximum operating power threshold; the preset second power threshold is, for example, the maximum operating power limit threshold Pmax1 of an air conditioning system. The specific functions and processing of this control unit 104 are also described in step S620.

[0135] like Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply further includes: Step 8: Determine whether the following conditions are met: solar irradiance threshold Gth2 ≤ solar irradiance G < solar irradiance threshold Gth3, and the second required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power as well as the third required power of the load component. If yes, proceed to step 81; otherwise, proceed to step 9.

[0136] Step 81: When the solar irradiance threshold Gth2 ≤ solar irradiance G < solar irradiance threshold Gth3, and the second required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power (e.g., the third required power of the load component), keep the relay switch K1 closed, control the air conditioning system to operate according to the air conditioning system's operating logic, increase the maximum operating power limit of the air conditioning system (e.g., the maximum operating power limit threshold Pmax1), and denote the operating power of the air conditioning system as P. Then, P < the maximum operating power limit threshold Pmax1. After that, return to step 3 for a new loop judgment. The maximum operating power limit thresholds Pmax1 and Pmax2 of the air conditioning system are both maximum operating power thresholds of the air conditioning system, and the maximum operating power limit threshold Pmax2 > the maximum operating power limit threshold Pmax1.

[0137] Increase the maximum operating power limit of the air conditioning system, such as the maximum operating power limit threshold Pmax1, to ensure that the photovoltaic power generation of the photovoltaic modules is sufficient to supply the actual operating power of the air conditioning system, and avoid the frequent shutdown of the air conditioning system caused by the mismatch between the photovoltaic power generation of the photovoltaic modules and the power consumption of the air conditioning system.

[0138] In some embodiments, the control unit 104, upon determining that the switching device is closed, controls the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module. The control unit further includes: controlling the load component to operate at a preset minimum power threshold, and then returning to re-determine whether the switching device is closed. The specific steps are as follows: The control unit 104 is further configured to, when the on / off device is closed, and when the solar irradiance of the photovoltaic module is less than a preset second solar irradiance within a preset solar irradiance range, and / or when the photovoltaic power generation of the photovoltaic module is less than the third required power of the load component, determine whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range, and determine whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the fourth required power of the load component, wherein the fourth required power of the load component is calculated based on the currently acquired current and voltage of the load component; preset solar irradiance... The preset first solar irradiance within the preset solar irradiance range is less than the maximum value of the preset solar irradiance range; the preset second solar irradiance within the preset solar irradiance range is less than the preset first solar irradiance within the preset solar irradiance range; the preset second solar irradiance within the preset solar irradiance range is greater than the minimum value of the preset solar irradiance range; the second required power of the load component is less than the first required power of the load component; the third required power of the load component is less than the second required power of the load component; the third required power of the load component is greater than the fourth required power of the load component; wherein, the minimum value of the preset solar irradiance range is such as the solar irradiance threshold Gth1, and the preset second solar irradiance is such as the solar irradiance threshold Gth2. The specific functions and processing of this control unit 104 are further described in step S710.

[0139] The control unit 104 is further configured to, when the on / off device is determined to be closed, if it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of a preset solar irradiance range and less than a preset second solar irradiance within the preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the fourth required power of the load component and less than the third required power of the load component, then keep the on / off device closed, control the load component to operate at a preset minimum power threshold, and then return to re-determine whether the on / off device is closed; the preset minimum power threshold is less than a preset second power threshold, the preset second power threshold is less than a preset first power threshold, and the preset first power threshold is less than a preset maximum operating power threshold. The specific functions and processing of this control unit 104 are also described in step S720.

[0140] The control unit 104 is further configured to, when the on / off device is determined to be closed, if it is determined that the solar irradiance of the photovoltaic module is less than the minimum value of a preset solar irradiance range, and / or that the photovoltaic power generation of the photovoltaic module is less than the fourth required power of the load component, then control the load component to shut down and control the on / off device to open, and then return to re-determine whether the on / off device is closed. The specific functions and processing of this control unit 104 are also described in step S730.

[0141] like Figure 11 As shown, a control method for an off-grid photovoltaic air conditioning system without battery power supply further includes: Step 9: Determine whether the following conditions are met: solar irradiance threshold Gth1 ≤ solar irradiance G < solar irradiance threshold Gth2, and the third required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power as the fourth required power of the load component. If yes, proceed to step 91; otherwise, proceed to step 10.

[0142] Step 91: When the solar irradiance threshold Gth1 ≤ solar irradiance G < solar irradiance threshold Gth2, and the third required power of the load component > the current photovoltaic power generation power ≥ the current air conditioning load power (e.g., the fourth required power of the load component), keep the relay switch K1 closed, and control the air conditioning system to operate at the minimum operating power of the air conditioning system (e.g., the minimum operating power limit threshold Pmin). Then return to step 3 for a new loop judgment. The minimum operating power limit threshold Pmin of the air conditioning system is 300W~350W, the maximum operating power limit threshold Pmax1 is 800W~850W, and the maximum operating power limit threshold Pmax2 is 1200W~1250W.

[0143] Increase the maximum operating power limit of the air conditioning system, such as the minimum operating power limit threshold Pmin, to ensure that the photovoltaic power generation is sufficient to supply the actual operating power of the air conditioning system, and avoid the frequent shutdown of the air conditioning system caused by the mismatch between the photovoltaic power generation of the photovoltaic modules and the power consumption of the air conditioning system.

[0144] Step 10: When the solar irradiance G < solar irradiance threshold Gth1, the load component shuts down and relay switch K1 opens. When the photovoltaic power generation of the photovoltaic module does not meet the power requirement for the minimum power operation of the air conditioning system, the load component shuts down and disconnects the load, then the relay switch K1 is re-evaluated to determine whether it is engaged, and this cycle repeats.

[0145] When the solar irradiance G < solar irradiance threshold Gth1, the load components stop operating. This means that high-power loads such as compressors and outdoor fans in the air conditioning system stop running, but low-power components such as temperature sensors, displays, and controllers in the air conditioning system can still operate because their power consumption is very small.

[0146] Specifically, for an air conditioning system, load components include high-power loads such as compressors and fans, as well as low-power loads such as temperature sensors and displays. Here, when the solar irradiance G < solar irradiance threshold Gth1, that is, when the photovoltaic power generation is insufficient to support the minimum operating power of the air conditioning system, the entire air conditioning system is shut down, i.e., the load components are shut down. This means that high-power loads such as compressors and outdoor fans in the air conditioning system stop operating, excluding low-power loads such as temperature sensors and displays, as well as controller components. At this time, low-power components such as temperature sensors, displays, and controller components continue to operate until the current photovoltaic power generation is insufficient to meet the operating power of the low-power components, at which point the low-power components stop working.

[0147] Taking a 35-unit air conditioning system as an example, the minimum operating power of the air conditioning system is approximately 150W. When the photovoltaic power generation is less than 150W, the air conditioning system will shut down directly. However, even when the air conditioning system shuts down, the controller components still need power, and the program continues to execute in a loop. When the photovoltaic power generation is less than 150W (e.g., 80W), the photovoltaic modules are not completely without power; it's just that the power output of the photovoltaic modules (e.g., 80W) is insufficient to support the operation of the air conditioning system. The operating power of a single controller is approximately 5W~10W, far less than 150W. When the photovoltaic module's power supply is weak, after the high-power loads in the air conditioning system's load components shut down, the photovoltaic module's power supply can support the controller's operation. If it's dark at night and there is no sunlight, the photovoltaic power generation is 0, the entire air conditioning system has no power, the controller components also do not receive power, and the program logic does not execute; in other words, the air conditioning system is in a state of complete power failure.

[0148] Wherein, solar irradiance G is the solar irradiance read in real time by the irradiance sensor; solar irradiance threshold Gth1 is solar irradiance threshold 1; solar irradiance threshold Gth2 is solar irradiance threshold 2; solar irradiance threshold Gth3 is solar irradiance threshold 3; and solar irradiance threshold Gth4 is solar irradiance threshold 4, and Gth4 ≥ Gth3 ≥ Gth2 ≥ Gth1. When G = Gth4, it indicates that the photovoltaic power generation is sufficient to meet the maximum operating power requirement of the air conditioning system; when G = Gth3, it indicates that the photovoltaic power generation is relatively large, but does not meet the maximum operating power requirement of the air conditioning system; when G = Gth2, it indicates that the photovoltaic power generation is relatively small, which can meet the small load operation of the air conditioning system; and when G = Gth1, it indicates that the photovoltaic power generation is very small, which can only meet the minimum power operation of the air conditioning system. Taking four photovoltaic panels, each with an area of ​​2.5 square meters, an irradiance of 1000W / square meter per panel, and a photovoltaic module efficiency of 20% as an example, Gth1 = 150 W / square meter ~ 200 W / square meter; Gth2 = 400 W / square meter ~ 450 W / square meter; Gth3 = 600 W / square meter ~ 650 W / square meter; Gth4 = 800 W / square meter ~ 850 W / square meter.

[0149] In the solution of this invention, during the operation of the air conditioning system, the photovoltaic air conditioning controller reads the solar irradiance in real time through an irradiance sensor and compares it with the solar irradiance threshold. Based on the comparison results, the operating logic of the air conditioning system is adjusted. During cloudy or rainy weather, the photovoltaic power generation of the photovoltaic modules may suddenly change or fluctuate, leading to a mismatch between the operating power of the air conditioning system and the photovoltaic power generation. By reading the solar irradiance in real time, the power generation can be estimated and changes in power generation can be quickly identified. Based on the changes in power generation, it is decided whether to limit the operating power of the air conditioning system, thereby avoiding frequent shutdowns, improving the overall reliability of the system, enhancing the user experience, and achieving good results.

[0150] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0151] According to an embodiment of the present invention, a photovoltaic air conditioning system corresponding to a control device for a photovoltaic air conditioning system is also provided. This photovoltaic air conditioning system may include: the control device for the photovoltaic air conditioning system described above.

[0152] Since the processing and functions implemented by the photovoltaic air conditioning system in this embodiment are basically the same as those of the aforementioned device embodiments, principles and examples, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0153] According to an embodiment of the present invention, a computer program product corresponding to the control method of a photovoltaic air conditioning system is also provided, including a computer program that, when executed by a processor, implements the steps of the control method of the photovoltaic air conditioning system described above.

[0154] Since the processing and functions implemented by the product in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0155] According to an embodiment of the present invention, a storage medium corresponding to a control method for a photovoltaic air conditioning system is also provided. The storage medium includes a stored program, wherein, when the program is executed, the device where the storage medium is located executes the steps of the control method for the photovoltaic air conditioning system described above.

[0156] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0157] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0158] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control method for a photovoltaic air conditioning system, characterized in that, The photovoltaic air conditioning system includes photovoltaic modules and an air conditioning system. The air conditioning system has a controller component and a load component, and an on / off device is provided between the controller component and the load component. The control method of the photovoltaic air conditioning system includes: When the controller is powered on after the photovoltaic module generates electricity and the controller receives a power-on command, the solar irradiance of the photovoltaic module is obtained. The switching device is controlled to open and close based on the solar irradiance of the photovoltaic module, and the operating power of the load component is also controlled.

2. The control method for a photovoltaic air conditioning system according to claim 1, characterized in that, Based on the solar irradiance of the photovoltaic module, the opening and closing of the switching device and the operating power of the load components are controlled, including: Determine whether the on / off device is closed or open; If it is determined that the switching device is disconnected, the opening and closing of the switching device is controlled according to the solar irradiance of the photovoltaic module; If the on / off device is determined to be closed, the photovoltaic power generation of the photovoltaic module is determined based on the solar irradiance of the photovoltaic module; and the operating power of the load component is controlled based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module.

3. The control method for the photovoltaic air conditioning system according to claim 2, characterized in that, in, Controlling the opening and closing of the switching device based on the solar irradiance of the photovoltaic module includes: Determine whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range; If it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range, then the on / off device is controlled to close, and then the process is repeated to re-determine whether the on / off device is closed. If it is determined that the solar irradiance of the photovoltaic module is less than the minimum value of the preset solar irradiance range, the on / off device remains open, and then returns to re-determine whether the on / off device is closed. And / or, Determining the photovoltaic power generation capacity of the photovoltaic module based on its solar irradiance includes: The photovoltaic power generation of the photovoltaic module is determined by multiplying the solar irradiance of the photovoltaic module, the predetermined total area of ​​the photovoltaic panels of the photovoltaic module, and the predetermined efficiency of the photovoltaic module.

4. The control method for the photovoltaic air conditioning system according to claim 2 or 3, characterized in that, Controlling the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module includes: Determine whether the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of the preset solar irradiance range, and determine whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current demand power of the load component, i.e., the first demand power of the load component. The first demand power of the load component is the demand power of the load component calculated based on the current and voltage of the load component currently obtained. If it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the maximum value of the preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the first required power of the load component, then the switching device is kept closed, the load component is controlled to operate according to the first required power of the load component, and the maximum operating power of the load component when operating according to the first required power of the load component is not additionally limited, and then the process is returned to re-determine whether the switching device is closed.

5. The control method for the photovoltaic air conditioning system according to claim 2 or 3, characterized in that, Controlling the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module further includes: If it is determined that the solar irradiance of the photovoltaic module is less than the maximum value of a preset solar irradiance range, and / or that the photovoltaic power generation of the photovoltaic module is less than the first required power of the load component, then it is determined whether the solar irradiance of the photovoltaic module is greater than or equal to a preset first solar irradiance within the preset solar irradiance range, and whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the second required power of the load component. The second required power of the load component is calculated based on the current and voltage of the load component currently obtained. The preset first solar irradiance within the preset solar irradiance range is less than the maximum value of the preset solar irradiance range; the second required power of the load component is less than the first required power of the load component. If it is determined that the solar irradiance of the photovoltaic module is greater than or equal to a preset first solar irradiance within a preset solar irradiance range and less than the maximum value within the preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the second required power of the load component and less than the first required power of the load component, then the switching device remains closed, the load component is controlled to operate at the second required power of the load component, and the maximum operating power of the load component when operating at the second required power of the load component is further limited to less than a preset first power threshold, and the preset first power threshold is less than the preset maximum operating power threshold of the load component, and then the process returns to re-determine whether the switching device is closed.

6. The control method for the photovoltaic air conditioning system according to claim 2 or 3, characterized in that, Controlling the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module further includes: If it is determined that the solar irradiance of the photovoltaic module is less than a preset first solar irradiance within a preset solar irradiance range, and / or it is determined that the photovoltaic power generation of the photovoltaic module is less than the second required power of the load component, then it is determined whether the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range, and whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the third required power of the load component. The third required power of the load component is calculated based on the current and voltage of the load component. The preset second solar irradiance within the preset solar irradiance range is less than the preset first solar irradiance within the preset solar irradiance range; the preset first solar irradiance within the preset solar irradiance range is less than the maximum value of the preset solar irradiance range; the third required power of the load component is less than the second required power of the load component; and the second required power of the load component is less than the first required power of the load component. If it is determined that the solar irradiance of the photovoltaic module is greater than or equal to a preset second solar irradiance within a preset solar irradiance range and less than a preset first solar irradiance within a preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the third required power of the load component and less than the second required power of the load component, then the switching device remains closed, the load component is controlled to operate at the third required power of the load component, and the maximum operating power of the load component when operating at the third required power is further limited to less than a preset second power threshold, and the preset second power threshold is less than a preset first power threshold. Then, the process returns to re-determine whether the switching device is closed; the preset first power threshold is less than a preset maximum operating power threshold.

7. The control method for a photovoltaic air conditioning system according to claim 2 or 3, characterized in that, Controlling the operating power of the load component based on the solar irradiance of the photovoltaic module and the photovoltaic power generation of the photovoltaic module further includes: If it is determined that the solar irradiance of the photovoltaic module is less than a preset second solar irradiance within a preset solar irradiance range, and / or if it is determined that the photovoltaic power generation of the photovoltaic module is less than the third required power of the load component, then it is determined whether the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range, and whether the photovoltaic power generation of the photovoltaic module is greater than or equal to the current required power of the load component, i.e., the fourth required power of the load component. The fourth required power of the load component is calculated based on the currently obtained current and voltage of the load component. Power; a preset first solar irradiance within a preset solar irradiance range is less than the maximum value of the preset solar irradiance range; a preset second solar irradiance within a preset solar irradiance range is less than the preset first solar irradiance within the preset solar irradiance range; a preset second solar irradiance within a preset solar irradiance range is greater than the minimum value of the preset solar irradiance range; the second required power of the load component is less than the first required power of the load component; the third required power of the load component is less than the second required power of the load component; the third required power of the load component is greater than the fourth required power of the load component; If it is determined that the solar irradiance of the photovoltaic module is greater than or equal to the minimum value of the preset solar irradiance range and less than the preset second solar irradiance within the preset solar irradiance range, and it is determined that the photovoltaic power generation of the photovoltaic module is greater than or equal to the fourth required power of the load component and less than the third required power of the load component, then the switching device remains closed, and the load component is controlled to operate at a preset minimum power threshold. After that, the process is repeated to re-determine whether the switching device is closed. The preset minimum power threshold is less than the preset second power threshold, the preset second power threshold is less than the preset first power threshold, and the preset first power threshold is less than the preset maximum operating power threshold. If it is determined that the solar irradiance of the photovoltaic module is less than the minimum value of the preset solar irradiance range, and / or it is determined that the photovoltaic power generation of the photovoltaic module is less than the fourth required power of the load component, then the load component is controlled to shut down, and the switching device is controlled to open, and then the process is repeated to re-determine whether the switching device is closed.

8. A control device for a photovoltaic air conditioning system, characterized in that, The photovoltaic air conditioning system includes photovoltaic modules and an air conditioning system. The air conditioning system has a controller component and a load component, and an on / off device is provided between the controller component and the load component. The control device of the photovoltaic air conditioning system includes: The acquisition unit is configured to acquire the solar irradiance of the photovoltaic module when the controller component is energized after the photovoltaic module generates electricity and the controller component receives a power-on command; The control unit is configured to control the opening and closing of the switching device and the operating power of the load components based on the solar irradiance of the photovoltaic module.

9. A photovoltaic air conditioning system, characterized in that, include: The control device for the photovoltaic air conditioning system as described in claim 8.

10. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the control method of the photovoltaic air conditioning system according to any one of claims 1 to 7.

11. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the photovoltaic air conditioning system according to any one of claims 1 to 7.

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