Off-grid photovoltaic air conditioner and control method thereof

Abstract

The invention discloses an off-grid photovoltaic air conditioner and a control method thereof, and the off-grid photovoltaic air conditioner comprises a photovoltaic module which is used for photovoltaic power generation to generate photovoltaic voltage; the air conditioning unit comprises a booster circuit module and an air conditioning load, and the booster circuit module is connected with the photovoltaic module and the air conditioning load and used for boosting the photovoltaic voltage and providing the photovoltaic voltage for the air conditioning load; and the controller is arranged on the air conditioning unit and connected with the booster circuit module and the air conditioning load, the controller is provided with a networking module, the networking module is used for networking to obtain weather information, and the controller controls output of the booster circuit module according to the weather information and adjusts the operation power of the air conditioning load. According to the off-grid photovoltaic air conditioner, the weather information is obtained through networking, the air conditioning unit is regulated and controlled according to the weather information, frequent shutdown of the off-grid photovoltaic air conditioner system due to weather changes is avoided, the stability and safety of the system are improved, and the user experience is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic air conditioners, and particularly to an off-grid photovoltaic air conditioner and a control method thereof. BACKGROUND

[0002] As a new energy air conditioner system, the photovoltaic air conditioner system has been increasingly improved and has been more widely and generally applied, especially in remote areas without power grids or some outdoor scenes. The photovoltaic air conditioner system can provide a better comfortable experience for users and has become the best choice for users.

[0003] At present, most users will choose a photovoltaic air conditioner system without a storage battery power supply because of the high cost of the storage battery system. However, the off-grid photovoltaic air conditioner system without a storage battery power supply may cause frequent shutdown of the air conditioner system when the photovoltaic power generation power changes suddenly or fluctuates in cloudy or overcast days. If the air conditioner system does not timely identify the change of the photovoltaic power generation power, the running power of the air conditioner system may not match the photovoltaic power generation power, thereby causing the problem of frequent shutdown of the air conditioner system. Long-term repeated start and stop may affect the service life of related parts and components, thereby affecting the reliability of the whole machine and the user experience. SUMMARY

[0004] Embodiments of the present application provide an off-grid photovoltaic air conditioner and a control method thereof, which solve the problem of frequent shutdown of the off-grid photovoltaic air conditioner without a storage battery caused by weather changes.

[0005] In a first aspect, the embodiments of the present application provide an off-grid photovoltaic air conditioner, which comprises: a photovoltaic assembly for photovoltaic power generation to generate a photovoltaic voltage; an air conditioner unit comprising a boost circuit module and an air conditioner load, the boost circuit module being connected to the photovoltaic assembly and the air conditioner load, and being used for boosting the photovoltaic voltage and providing the air conditioner load with the boosted photovoltaic voltage; and a controller arranged in the air conditioner unit and connected to the boost circuit module and the air conditioner load, the controller being provided with a networking module, the networking module being used for networking to obtain weather information, and the controller being used for controlling the output of the boost circuit module and adjusting the running power of the air conditioner load according to the weather information.

[0006] Further, the boost circuit module comprises a Boost boost circuit and a on-off device, the input end of the Boost boost circuit is connected to the output end of the photovoltaic assembly, the output end of the Boost boost circuit is connected to the input end of the air conditioner load through the on-off device, and the controller is connected to the on-off device and the Boost boost circuit. The Boost boost circuit is used for boosting the photovoltaic voltage, and the on-off device is used for turning on and off the connection between the output end of the Boost boost circuit and the input end of the air conditioner load.

[0007] Further, the Boost voltage boosting circuit comprises a voltage boosting inductor, a switch tube, an output filter capacitor and a first diode, a gate of the switch tube is connected to the controller, a source of the switch tube is connected to a positive output end of the photovoltaic module through the voltage boosting inductor, a drain of the switch tube is connected to a negative output end of the photovoltaic module and a negative pole of the air conditioner load, a positive pole of the air conditioner load is connected to the source of the switch tube through the on-off device and the first diode in sequence, one end of the output filter capacitor is connected between the on-off device and the first diode, and the other end of the output filter capacitor is connected to the drain of the switch tube.

[0008] Further, the networking module is a 5G module.

[0009] In a second aspect, an off-grid photovoltaic air conditioner control method is provided, which is applied to the off-grid photovoltaic air conditioner in the first aspect, and the method comprises the following steps: acquiring a current period weather condition and a next period weather condition; determining a target control instruction according to the current period weather condition and the next period weather condition; and controlling an air conditioner unit to operate by using the target control instruction.

[0010] The off-grid photovoltaic air conditioner comprises a photovoltaic module, an air conditioner unit, and a controller. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0012] Figure 1 A schematic block diagram of the off-grid photovoltaic air conditioner provided by the embodiments of the present application is shown in the figure. Figure 2 A circuit diagram of the voltage boosting circuit module provided by the embodiments of the present application is shown in the figure. Figure 3 Step flow chart of the method provided by the embodiment of the present application; Figure 4 Sub-step flow chart of the method provided by the embodiment of the present application; Figure 5 Sub-step flow chart of the method provided by the embodiment of the present application; Figure 6 Sub-step flow chart of the method provided by the embodiment of the present application; Figure 7 Sub-step flow chart of the method provided by the embodiment of the present application; Figure 8 Sub-step flow chart of the method provided by the embodiment of the present application; Reference signs: 100, off-grid photovoltaic air conditioner; 10, photovoltaic module; 20, air conditioning unit; 21, boost circuit module; 211, Boost boost circuit; 22, air conditioning load; 30, controller; 31, networking module. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0014] The direction terms mentioned in the present application, such as “up”, “down”, “front”, “back”, “left”, “right”, “inner”, “outer”, “side” and the like, are only the directions of the attached drawings. Therefore, the direction terms used are used to illustrate and understand the present application, rather than to limit the present application. In addition, in the drawings, structures similar or identical in structure are denoted by the same reference numerals.

[0015] Referring to Figure 1 The present application provides an off-grid photovoltaic air conditioner 100, Figure 1 is a schematic block diagram of the off-grid photovoltaic air conditioner 100, which will be described below in combination with Figure 1 The structure and working principle of the off-grid photovoltaic air conditioner 100 will be described in detail.

[0016] As Figure 1As shown, the off-grid photovoltaic air conditioner 100 comprises a photovoltaic assembly 10, an air conditioner unit 20 and a controller 30, the photovoltaic assembly 10 is used for photovoltaic power generation to generate a photovoltaic voltage; the air conditioner unit 20 comprises a boost circuit module 21 and an air conditioner load 22, the boost circuit module 21 connects the photovoltaic assembly 10 and the air conditioner load 22, and is used for boosting the photovoltaic voltage and outputting to the air conditioner load 22 for use; the controller 30 is arranged in the air conditioner unit 20 and is connected with the boost circuit module 21 and the air conditioner load 22, the controller 30 is provided with a networking module 31, the networking module 31 is used for networking to obtain weather information, and the controller 30 controls the output of the boost circuit module 21 and adjusts the operating power of the air conditioner load 22 according to the weather information.

[0017] In a specific implementation, the off-grid photovoltaic air conditioner 100 can operate without connecting to the power grid to provide air conditioning functions for users. Specifically, the off-grid photovoltaic air conditioner 100 is mainly composed of a photovoltaic assembly 10, an air conditioner unit 20, and a controller 30. The photovoltaic assembly 10 can be a solar panel or an array thereof, and is used for photovoltaic power generation to generate a photovoltaic voltage, which is the energy source of the entire air conditioning system. The air conditioner unit 20 mainly includes a boost circuit module 21 and an air conditioner load 22. The input side of the boost circuit module 21 is connected to the photovoltaic assembly 10, and the output side is connected to the air conditioner load 22. The boost circuit module 21 is used to step up the photovoltaic voltage and output it to the air conditioner load 22 for use. Specifically, the boost circuit module 21 can convert the photovoltaic voltage output by the photovoltaic assembly 10 into a higher voltage for stable output to the air conditioner load 22, thereby meeting the operating power requirements of the air conditioner load 22. The air conditioner load 22 can include indoor unit load and outdoor unit load. The indoor unit load can include indoor fan, air deflector motor, indoor unit controller, and other electrical components. The outdoor unit load can include compressor, outdoor fan, outdoor unit controller, and other electrical components. The indoor unit controller and the outdoor unit controller can communicate through RS485 connection. The outdoor unit load and the outdoor unit load can cooperate to achieve air conditioning refrigeration or heating. The controller 30 is arranged in the air conditioner unit 20. Specifically, the controller 30 of the present embodiment can be an indoor unit controller. The controller 30 is connected to the boost circuit module 21 and the air conditioner load 22. The controller 30 can control the operation of the boost circuit module 21 and the air conditioner load 22, including adjusting the output voltage of the boost circuit module 21 and controlling the operating power of the air conditioner load 22, etc. A networking module 31 is arranged on the controller 30. The networking module 31 is used to obtain weather information through networking. Specifically, the networking module 31 can be a 5G module, a Wi-Fi module, an NB-IoT module, or other modules that can realize network connection. Through the networking module 31, the air conditioning system realizes network connection, thereby obtaining weather information. The weather information is the weather information of the region where the air conditioning user is located. Specifically, the weather information can include weather conditions, location information, and time information, etc. For example, the user is located in region A, the current time is 10:30, and the weather condition is cloudy. The controller 30 can control the output of the boost circuit module 21 and adjust the operating power of the air conditioner load 22 according to the weather information. For example, when the weather condition is good, such as sunny day, the boost circuit module 21 can be controlled to output a voltage that meets the full load operation of the air conditioner, and the air conditioner load 22 can be controlled to operate at full power. When the weather condition is poor, such as cloudy or overcast day, the boost circuit module 21 can be controlled to output a suitable voltage that meets the basic operation of the air conditioner, and the operating power of the air conditioner load 22 can be limited. Through intelligent control strategy for the air conditioner unit 20, the off-grid photovoltaic air conditioner 100 system can be prevented from frequent shutdown due to weather changes. The control strategy of the air conditioner unit 20 will be described in detail in the method described below, and will not be described here.

[0018] Further, referring to Figure 2 , the boost circuit module 21 comprises a Boost circuit 211 and a switch device K1, the input end of the Boost circuit 211 is connected to the output end of the photovoltaic module 10, the output end of the Boost circuit 211 is connected to the input end of the air conditioning load 22 through the switch device K1, and the controller 30 is connected to the switch device K1 and the Boost circuit 211, wherein the Boost circuit 211 is used for boosting the photovoltaic voltage, and the switch device K1 is used for switching the connection between the output end of the Boost circuit 211 and the input end of the air conditioning load 22. In a specific implementation, the boost circuit module 21 mainly comprises the Boost circuit 211 and the switch device K1, the Boost circuit 211 is a DC-DC converter for converting a DC input voltage into a higher DC output voltage, the input end of the Boost circuit 211 is connected to the output end of the photovoltaic module 10, and the output end of the Boost circuit 211 is connected to the input end of the air conditioning load 22 through the switch device K1. The photovoltaic voltage can be boosted by the Boost circuit 211, and the boosted voltage is provided to the air conditioning load 22 through the switch device K1, wherein the switch device K1 can be a relay or other electrically controlled switching device. The controller 30 is connected to the switch device K1 and the Boost circuit 211, the output voltage of the Boost circuit 211 can be regulated by the controller 30, the switch device K1 serves as a switch between the Boost circuit 211 and the air conditioning load 22, the switch device K1 can switch the connection between the output end of the Boost circuit 211 and the input end of the air conditioning load 22, and the switch device K1 is also controlled by the controller 30. In actual application, only when the controller 30 controls the switch device K1 to be attracted, the voltage output by the Boost circuit 211 can be provided to the air conditioning load 22, and the air conditioning load 22 can normally operate; when the controller 30 controls the switch device K1 to be disconnected, the voltage output by the Boost circuit 211 cannot be provided to the air conditioning load 22, and the air conditioning load 22 cannot operate. The control system can regulate the output voltage of the Boost circuit 211 and the attraction state of the switch device K1 according to weather information, so as to realize intelligent regulation and control of the air conditioning unit 20, thereby avoiding frequent shutdown of the off-grid photovoltaic air conditioner 100 system due to weather changes.

[0019] Further, referring to Figure 2The Boost voltage-boosting circuit 211 comprises a voltage-boosting inductor L1, a switch tube Q1, an output filter capacitor C1 and a first diode VD1. The gate of the switch tube Q1 is connected to the controller 30, the source is connected to the positive output terminal of the photovoltaic module 10 through the voltage-boosting inductor L1, the drain is connected to the negative output terminal of the photovoltaic module 10 and the negative electrode of the air conditioner load 22, the positive electrode of the air conditioner load 22 is connected to the source of the switch tube Q1 in sequence through the on-off device K1 and the first diode VD1, and one end of the output filter capacitor C1 is connected between the on-off device K1 and the first diode VD1, and the other end is connected to the drain of the switch tube Q1. In a specific implementation, the Boost voltage-boosting circuit 211 mainly comprises a voltage-boosting inductor L1, a switch tube Q1, an output filter capacitor C1 and a first diode VD1. The voltage-boosting inductor L1 is connected to the photovoltaic module 10 through a second diode VD2, specifically, the voltage-boosting inductor L1 is connected to the cathode of the second diode VD2, and the anode of the second diode VD2 is connected to the positive electrode of the photovoltaic module 10. Through the second diode VD2, the current can be prevented from flowing back into the photovoltaic module 10, thereby protecting the system safety. The Boost voltage-boosting circuit is realized by cooperation of various devices, and the switch tube Q1 can be an IGBT. In a specific application, the switch tube Q1 is controlled by the PWM output by the controller 30, and is periodically turned on or turned off, thereby controlling the charging and discharging of the voltage-boosting inductor L1. The output filter capacitor C1 plays a role of filtering and voltage stabilizing, so that the output voltage is more stable. When the switch tube Q1 is turned on, the input photovoltaic voltage charges the voltage-boosting inductor L1. When the switch tube Q1 is turned off, the photovoltaic voltage and the voltage-boosting inductor L1 charge the output filter capacitor C1 through the first diode VD1, and at the same time, supply power to the air conditioner load, thereby realizing the voltage-boosting conversion of the photovoltaic voltage. In actual application, as shown in FIG. 6, the Boost voltage-boosting circuit can boost the photovoltaic voltage VPV output by the photovoltaic module 10 to a direct-current bus voltage VDC1, for supplying the air conditioner load 22, wherein the range of the photovoltaic voltage VPV output by the photovoltaic module 10 can be set as 200V-350V, and the voltage range of the direct-current bus voltage VDC1 can be set as 360V-420V. Figure 2

[0020] ​In an embodiment, the networking module 31 is a 5G module. In a specific implementation, the networking module 31 adopts a 5G module, that is, a 5G module is integrated on the controller 30. The 5G module has advantages of high transmission rate, low delay, multi-link, high energy efficiency, etc. The 5G module supports a transmission rate of gigabit (up to 10 Gbit / s), and the end-to-end delay can be as low as milliseconds. Through ultra-dense networking and large-scale antenna array technology, the 5G module can connect more devices at the same time, solving the problem of network congestion. Through the 5G module, the controller 30 can make the air conditioning system networked to obtain weather information, which can improve the information acquisition efficiency, increase the accuracy of information acquisition, and make the system control more accurate and reliable.

[0021] In summary, the off-grid photovoltaic air conditioner of the present application obtains weather information through networking, intelligently controls the air conditioning unit according to the weather information, avoids frequent shutdown of the off-grid photovoltaic air conditioning system due to weather changes, improves the stability and safety of the system, and improves the user experience.

[0022] Please refer to Figure 3 , the present application provides a kind of off-grid photovoltaic air conditioner control method, Figure 3 The step flow chart of the off-grid photovoltaic air conditioner control method. The off-grid photovoltaic air conditioner control method described above is applied to the off-grid photovoltaic air conditioner described in the above embodiment. Since the off-grid photovoltaic air conditioner has been described in detail in the above embodiment, for the sake of brevity of the description, it will not be described here. The off-grid photovoltaic air conditioner control method will be described in detail as follows. As shown in Figure 3 The method comprises steps S110-S130.

[0023] S110, obtain the current period weather condition and the next period weather condition.

[0024] In a specific implementation, after the air conditioning system is started, the system obtains real-time time information, location information, weather conditions, etc. of the region where the user is located through the 5G module networking. The weather conditions can be divided into five categories from good to bad, i.e. "sunny day", "few clouds", "cloudy", "overcast day", and "rain / snow day and other bad weather". The system can accurately obtain the current period weather condition and the next period weather condition. The current period weather condition is the weather condition of the period when the air conditioning system is running. The weather condition obtained through networking usually contains weather conditions of multiple different periods. Usually, every 30 minutes is a period. For example, the weather from 10:00 to 10:30 am is sunny, and the weather from 10:30 to 11:00 am is overcast. If the air conditioning system is running at 10:00 am, the current period weather condition is sunny, and the next period weather condition is overcast.

[0025] S120, determine the target control instruction according to the current period weather condition and the next period weather condition.

[0026] In the embodiment, the air conditioning system determines the target control instruction according to the current period weather condition and the next period weather condition, the target control instruction is an instruction for regulating the operation of the air conditioning unit, specifically, regulating the boost circuit module and the air conditioning load of the air conditioning unit, for example, controlling the output voltage of the boost circuit module or stopping the output voltage, adjusting the operation power of the air conditioning load.

[0027] In an embodiment, as shown in Figure 4 The step S120 includes steps S1201-S1203.

[0028] S1201, determining whether the next period weather condition is sunny.

[0029] In the embodiment, after the system obtains the current period weather condition and the next period weather condition, it first determines whether the next period weather condition is sunny, so as to confirm how the weather condition changes from the current period to the next period.

[0030] S1202, if the next period weather condition is sunny, determining whether the current period weather condition is sunny.

[0031] In the embodiment, if the system determines that the next period weather condition is sunny, it further determines whether the current period weather condition is sunny, so as to confirm how the weather condition changes from the current period to the next period, whether it is getting better or getting worse, for example, if the next period weather condition is sunny and the current period weather condition is cloudy or overcast or cloudy or bad weather (rain and snow, etc.), it can be confirmed that the weather condition is getting better. The system determines the target control instruction according to the change of the weather condition from the current period to the next period, so as to intelligently regulate the air conditioning unit.

[0032] S1203, if the current period weather condition is sunny, the target control instruction is to control the boost circuit module to output and not to limit the current operation power of the air conditioning load, otherwise the target control instruction is to control the boost circuit module to output and not to limit the current operation power of the air conditioning load after delaying a first preset time.

[0033] In the embodiment, if the system determines that the current period weather condition is sunny, it means that there is no change in the weather condition from the current period to the next period, both are sunny, the sunlight is sufficient, and the photovoltaic power generation efficiency of the photovoltaic module is high, therefore, the system sets the target control instruction to control the boost circuit module to output and not to limit the current operation power of the air conditioning load, the target control instruction is executed as follows Figure 2As shown, the target control instruction is to control the on-off device K1 of the boost circuit module to be attracted, so that the boost circuit can output voltage to the air conditioner load, and the controller does not increase the limit on the current running power of the air conditioner load, so that the air conditioner load can run at full load under the current sufficient photovoltaic condition, thereby meeting the use demand of the user and improving the use experience of the user.

[0034] If the system determines that the weather condition of the current period is not sunny, it means that the weather condition of the current period may be worse than sunny, such as cloudy or overcast or cloudy or severe weather, and the weather condition of the next period is sunny, which means that the weather condition will turn better. The system sets the target control instruction to control the boost circuit module to output and delay the first preset time to limit the current running power of the air conditioner load, wherein the first preset time is set to be less than the interval between the current period and the next period, and can be set to 1 / 3 of the interval between the current period and the next period, for example, the interval between the current period and the next period is 30 minutes, and the first preset time can be set to 10 minutes. When the target control instruction is executed, as shown in Figure 2 As shown, the target control instruction is to control the on-off device K1 of the boost circuit module to be attracted, so that the boost circuit can output voltage to the air conditioner load, and the controller does not increase the limit on the current running power of the air conditioner load, so that the air conditioner load can run at full load under the current sufficient photovoltaic condition, thereby meeting the use demand of the user and improving the use experience of the user.

[0035] In an embodiment, as shown in Figure 5 The step S120 includes steps S1204-S1206.

[0036] S1204, determine whether the weather condition of the next period is cloudy.

[0037] In a specific implementation, after the system obtains the weather condition of the current period and the weather condition of the next period, it determines whether the weather condition of the next period is cloudy, so as to confirm how the weather condition changes from the current period to the next period.

[0038] S1205, if the weather condition of the next period is cloudy, determine whether the weather condition of the current period is cloudy or sunny.

[0039] In practice, if the system determines that the weather condition for the next time period will be partly cloudy, it then determines whether the current weather condition is partly cloudy or sunny. In other words, it determines whether the current weather condition is better than partly cloudy to confirm how the weather condition changes from the current time period to the next – whether it worsens or improves. For example, if the next time period's weather condition is partly cloudy while the current weather condition is sunny, it can be confirmed that the weather condition has worsened. Conversely, if the next time period's weather condition is partly cloudy while the current weather condition is cloudy, overcast, or has severe weather (rain, snow, etc.), it can be confirmed that the weather condition has improved. The system determines the target control command based on the changes in weather conditions from the current time period to the next, thereby intelligently regulating the air conditioning unit.

[0040] S1206. If the current weather conditions are sunny or partly cloudy, the target control instruction is to control the output of the boost circuit module and increase the maximum operating power limit of the air conditioner load; otherwise, the target control instruction is to control the output of the boost circuit module and update the maximum power limit of the air conditioner load to the first power threshold after a first preset time delay.

[0041] In practical implementation, if the system determines that the current weather condition is sunny or partly cloudy, it indicates that the weather condition will remain unchanged or worsen from the current time period to the next. Specifically, if the current weather condition is sunny, the weather condition is worsening, and the photovoltaic (PV) power generation efficiency of the PV modules will decrease. Conversely, if the current weather condition is partly cloudy, the weather condition remains unchanged, and the PV power generation efficiency of the PV modules will remain stable. Therefore, the system sets the target control instruction to control the output of the boost circuit module and increase the maximum operating power limit of the air conditioning load. When this target control instruction is executed, such as... Figure 2 As shown, this is manifested in the activation of the on / off device K1 of the control boost circuit module, which allows the Boost boost circuit to output voltage to the air conditioning load. The controller also limits the maximum operating power of the air conditioning load, which is limited to a fixed value. This value can be set according to the actual parameters of the air conditioning unit to prevent the air conditioning unit from running out of power when the weather conditions worsen in the next period, thus avoiding unit shutdown and improving the user experience.

[0042] If the system determines that the current weather condition is not sunny or cloudy, which means the current weather condition is worse than cloudy, such as cloudy or overcast or bad weather, and the next period weather condition is cloudy, which means the weather condition is getting better, the system sets the target control instruction as controlling the boost circuit module to output and updating the maximum power limit of the air conditioning load to the first power threshold after a first preset time. The first preset time is less than the interval between the current period and the next period, and the first preset time can be set to 1 / 3 of the interval between the current period and the next period, for example, if the interval between the current period and the next period is 30 minutes, the first preset time can be set to 10 minutes. The first power threshold can be set according to the operating power demand of the air conditioning load. When the target control instruction is executed, as shown in Figure 2 , it is embodied as controlling the on-off device K1 of the boost circuit module to attract, so that the boost circuit can output voltage to the air conditioning load. The controller updates the maximum power of the air conditioning load to the first power threshold after the first preset time, so that the air conditioning load is limited to operate for a period of time in the period of bad weather condition, and can operate according to the first power threshold when the weather gradually gets better in the next period, improving the user experience.

[0043] In an embodiment, as shown in Figure 6 , the step S120 includes steps S1207-S1209.

[0044] S1207, determine whether the next period weather condition is cloudy.

[0045] In specific implementation, after the system obtains the current period weather condition and the next period weather condition, it determines whether the next period weather condition is cloudy, so as to confirm how the weather condition changes from the current period to the next period.

[0046] S1208, if the next period weather condition is cloudy, determine whether the current period weather condition is cloudy or cloudy or sunny.

[0047] In specific implementation, if the system determines that the next period weather condition is cloudy, it further determines whether the current period weather condition is cloudy or cloudy or sunny, that is, it determines whether the current period weather condition is better than cloudy, so as to confirm how the weather condition changes from the current period to the next period, whether it is getting better or getting worse, for example, if the next period weather condition is cloudy and the current period weather condition is sunny or cloudy, it can be confirmed that the weather condition is getting worse, and if the next period weather condition is cloudy and the current period weather condition is overcast or bad weather (rainy or snowy day, etc.), it can be confirmed that the weather condition is getting better. The system determines the target control instruction according to the change of the weather condition from the current period to the next period, so as to intelligently control the air conditioning unit.

[0048] S1209. If the current weather conditions are cloudy, partly cloudy, or sunny, the target control instruction is to control the output of the boost circuit module and increase the maximum operating power limit of the air conditioner load; otherwise, the target control instruction is to control the output of the boost circuit module and update the maximum power limit of the air conditioner load to the second power threshold after a first preset time delay.

[0049] In practical implementation, if the system determines that the current weather condition is cloudy, partly cloudy, or sunny, it indicates that the weather condition will remain unchanged or worsen from the current time period to the next. Specifically, if the current weather condition is partly cloudy or sunny, the weather condition is worsening, and the photovoltaic power generation efficiency of the photovoltaic modules will decrease. Conversely, if the current weather condition is cloudy, the weather condition remains unchanged, and the photovoltaic power generation efficiency of the photovoltaic modules is also lower in cloudy weather. Therefore, the system sets the target control instruction to control the output of the boost circuit module and increase the maximum operating power limit of the air conditioning load. When this target control instruction is executed, such as... Figure 2 As shown, this is manifested in the activation of the on / off device K1 of the control boost circuit module, which allows the Boost boost circuit to output voltage to the air conditioning load. The controller also limits the maximum operating power of the air conditioning load, which is limited to a fixed value. This value can be set according to the actual parameters of the air conditioning unit to prevent the air conditioning unit from running out of power when the weather conditions worsen in the next period, thus avoiding unit shutdown and improving the user experience.

[0050] If the system determines that the current weather conditions are not cloudy, partly cloudy, or sunny, it means the current weather conditions are worse than cloudy, such as overcast or severe weather. If the next time period's weather conditions are cloudy, indicating an improvement in weather conditions, the system sets the target control command to control the boost circuit module output and, after a first preset time delay, update the air conditioner load's maximum power limit to a second power threshold. The first preset time is less than the interval between the current and next time periods. The first preset time can be set to 1 / 3 of the interval between the current and next time periods; for example, if the interval is 30 minutes, the first preset time can be set to 10 minutes. The second power threshold can be set according to the operating power requirements of the air conditioner load. When this target control command is executed, such as... Figure 2 As shown, this is manifested in the activation of the on / off device K1 of the boost circuit module, which allows the Boost circuit to output voltage to the air conditioning load. The controller updates the maximum power of the air conditioning load to the second power threshold only after the first preset time when the judgment result is obtained. This allows the air conditioning load to be limited in operating power for a period of time during periods of poor weather conditions. After the first preset time, when the weather gradually improves in the next period, it can operate according to the second power threshold, thus improving the user experience.

[0051] In an embodiment, as shown in Figure 7 The step S120 includes steps S1210-S1212.

[0052] S1210, determining whether the next period weather condition is overcast.

[0053] In a specific implementation, after the system obtains the current period weather condition and the next period weather condition, it determines whether the next period weather condition is overcast, so as to confirm how the weather condition changes from the current period to the next period.

[0054] S1211, if the next period weather condition is overcast, determining whether the current period weather condition is overcast or cloudy or partly cloudy or sunny.

[0055] In a specific implementation, if the system determines that the next period weather condition is overcast, it further determines whether the current period weather condition is overcast or cloudy or partly cloudy or sunny, i.e., determines whether the current period weather condition is better than overcast, so as to confirm how the weather condition changes from the current period to the next period, i.e., whether it gets better or worse. For example, if the next period weather condition is overcast and the current period weather condition is sunny or partly cloudy or cloudy, it can be confirmed that the weather condition gets worse, and if the next period weather condition is cloudy and the current period weather condition is bad weather (rainy or snowy weather, etc.), it can be confirmed that the weather condition gets better. The system determines the target control instruction according to the change of the weather condition from the current period to the next period, so as to intelligently control the air conditioning unit.

[0056] S1212, if the current period weather condition is overcast or cloudy or partly cloudy or sunny, the target control instruction is to control the boost circuit module to output and increase the minimum operating power limit, otherwise the target control instruction is to control the boost circuit module to output and increase the minimum operating power limit of the air conditioning load after a delay of a first preset time.

[0057] In a specific implementation, if the system determines that the current period weather condition is overcast or cloudy or partly cloudy or sunny, it means that the weather condition from the current period to the next period remains unchanged or gets worse, wherein if the current period weather condition is partly cloudy or cloudy or sunny, it means that the weather condition gets worse, and the photovoltaic power generation efficiency of the photovoltaic assembly will be significantly reduced. If the current period weather condition is overcast, it means that the weather condition remains unchanged, and the photovoltaic power generation efficiency of the photovoltaic assembly under overcast weather is significantly lower. Therefore, the system sets the target control instruction as controlling the boost circuit module to output and increase the minimum operating power limit. The target control instruction is executed as follows: Figure 2As shown, it is embodied that the controller controls the on-off device K1 of the boost circuit module to be attracted, so that the boost circuit can output voltage to the air conditioning load, and the minimum operating power of the air conditioning load is limited to a fixed value, which can be set according to the actual parameters of the air conditioning unit, so as to avoid the operating power of the air conditioning unit exceeding the photovoltaic power generation power when the weather condition is deteriorated in the next period, and the unit is shut down, thereby improving the user experience.

[0058] If the system determines that the weather condition in the current period is not overcast or cloudy or partly cloudy or sunny, it means that the current weather condition is worse than overcast, usually severe weather, etc., and the weather condition in the next period is overcast, which means that the weather condition is getting better. The system sets the target control instruction to control the boost circuit module to output and increase the minimum operating power limit of the air conditioning load after a first preset time. The first preset time is less than the interval between the current period and the next period, and the first preset time can be set to 1 / 3 of the interval between the current period and the next period, for example, the interval between the current period and the next period is 30 minutes, and the first preset time can be set to 10 minutes. When the target control instruction is executed, as shown in Figure 2 As shown, the controller controls the on-off device K1 of the boost circuit module to be attracted only after the first preset time when the judgment result is obtained, so that the boost circuit can output voltage to the air conditioning load, and the minimum operating power of the air conditioning load is limited, so that the air conditioning load is powered off in the period when the photovoltaic power generation efficiency of the photovoltaic module is significantly reduced in overcast days. When the weather gradually improves in the next period, it can be operated according to the minimum operating power limit, so as to avoid frequent start and stop of the air conditioning unit, and improve the user experience.

[0059] In an embodiment, as shown in Figure 8 The step S120 includes steps S1213-S1214.

[0060] S1213, determine whether the weather condition in the next period is severe weather.

[0061] In a specific implementation, after the system obtains the weather condition in the current period and the weather condition in the next period, it determines whether the weather condition in the next period is severe weather, which can include rainy days, snowy days, hail days, etc. It can be confirmed how the weather condition changes from the current period to the next period.

[0062] S1214, if the weather condition in the next period is severe weather, the target control instruction is to control the air conditioning load to be powered off and then control the boost circuit module to stop outputting.

[0063] In a specific implementation, if the system determines that the weather condition of the next period is bad weather, it means that the photovoltaic power generation efficiency of the photovoltaic module in the next period is very low or even cannot generate electricity, at this time, the system sets the target control instruction as controlling the air conditioning load to stop and then controlling the boost circuit module to stop outputting. As shown in FIG. 13, the target control instruction is embodied as controlling the air conditioning load to stop first, so that the air conditioning load stops working first, and then controlling the on-off device K1 of the boost circuit module to disconnect, so that the output end of the boost circuit is disconnected from the input end of the air conditioning load, thereby protecting the safety of the system. Figure 2

[0064] S130, controlling the air conditioning unit to operate according to the target control instruction.

[0065] In a specific implementation, after the system determines the target control instruction, the air conditioning unit is controlled to operate according to the target control instruction. The target control instruction has been described in detail in the above embodiments, and will not be repeated here. The system controls the boost circuit module and the air conditioning load of the air conditioning unit through the target control instruction, so as to realize intelligent control of the off-grid photovoltaic air conditioner according to the change of the weather condition, effectively avoid the air conditioning unit from frequently stopping, improve the stability and safety of the system, and improve the user experience.

[0066] In summary, the method of the present application acquires the weather condition of the current period and the weather condition of the next period, and then determines the target control instruction according to the weather condition of the current period and the weather condition of the next period, and controls the air conditioning unit to operate according to the target control instruction, which realizes intelligent control of the off-grid photovoltaic air conditioner according to the change of the weather condition, effectively avoids the air conditioning unit from frequently stopping due to the change of the weather condition, improves the stability and safety of the system, and improves the user experience.

[0067] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​

Claims

1. An off-grid photovoltaic air conditioner characterized in that, The application relates to a photovoltaic air conditioner. The photovoltaic air conditioner comprises a photovoltaic module, an air conditioner unit, and a controller. The photovoltaic module is used for photovoltaic power generation to generate a photovoltaic voltage. The air conditioner unit comprises a boost circuit module and an air conditioner load.

2. The off-grid PV air conditioner as claimed in claim 1, wherein, The boost circuit module is connected to the photovoltaic module and the air conditioner load and is used for boosting the photovoltaic voltage and providing the boosted photovoltaic voltage for the air conditioner load.

3. The off-grid PV air conditioner as claimed in claim 2, wherein, The controller is arranged in the air conditioner unit and is connected to the boost circuit module and the air conditioner load.

4. The off-grid PV air conditioner as claimed in any one of claims 1 to 3, wherein, The controller is provided with a networking module.

5. A method for off-grid photovoltaic air conditioner control, the method comprising: The networking module is used for networking to acquire weather information. The controller controls the output of the boost circuit module and adjusts the running power of the air conditioner load according to the weather information. The boost circuit module comprises a Boost circuit and a switch device. The input end of the Boost circuit is connected to the output end of the photovoltaic module.

6. The method of claim 5, wherein, The output end of the Boost circuit is connected to the input end of the air conditioner load through the switch device. The controller is connected to the switch device and the Boost circuit. The Boost circuit is used for boosting the photovoltaic voltage. The switch device is used for switching the connection between the output end of the Boost circuit and the input end of the air conditioner load.

7. The method of claim 5, wherein, The Boost circuit comprises a boost inductor, a switch tube, an output filter capacitor, and a first diode. The gate of the switch tube is connected to the controller. The source of the switch tube is connected to the positive output end of the photovoltaic module through the boost inductor. The drain of the switch tube is connected to the negative output end of the photovoltaic module and the negative electrode of the air conditioner load. The positive electrode of the air conditioner load is connected to the source of the switch tube through the switch device and the first diode in sequence. One end of the output filter capacitor is connected between the switch device and the first diode. The other end of the output filter capacitor is connected to the drain of the switch tube. The networking module is a 5G module. The method is applied to the off-grid photovoltaic air conditioner. The method comprises the following steps: Acquiring the weather condition of a current period and the weather condition of a next period. Determining a target control instruction according to the weather condition of the current period and the weather condition of the next period. Controlling the air conditioner unit to run according to the target control instruction. The method of determining the target control instruction according to the weather condition of the current period and the weather condition of the next period comprises the following steps: Judging whether the weather condition of the next period is sunny. If the weather condition of the next period is sunny, judging whether the weather condition of the current period is sunny. If the weather condition of the current period is sunny, the target control instruction is to control the boost circuit module to output and not to limit the current running power of the air conditioner load. If the weather condition of the current period is not sunny, the target control instruction is to control the boost circuit module to output and not to limit the current running power of the air conditioner load after delaying a first preset time. The method of determining the target control instruction according to the weather condition of the current period and the weather condition of the next period comprises the following steps: Judging whether the weather condition of the next period is partly cloudy. If the weather condition of the next period is partly cloudy, judging whether the weather condition of the current period is partly cloudy or sunny. If the weather condition of the current period is partly cloudy or sunny, the target control instruction is to control the boost circuit module to output and not to limit the current running power of the air conditioner load. If the weather condition of the current period is not partly cloudy or sunny, the target control instruction is to control the boost circuit module to output and not to limit the current running power of the air conditioner load after delaying a second preset time. If the current period weather condition is sunny or little cloudy, the target control instruction is to control the boost circuit module to output and increase the maximum running power limit of the air conditioning load, otherwise the target control instruction is to control the boost circuit module to output and update the maximum power limit of the air conditioning load to the first power threshold after delaying for a first preset time.

8. The method of claim 5, wherein, The target control instruction is determined according to the current period weather condition and the next period weather condition, comprising: judging whether the next period weather condition is cloudy; if the next period weather condition is cloudy, judging whether the current period weather condition is cloudy or little cloudy or sunny; if the current period weather condition is cloudy or little cloudy or sunny, the target control instruction is to control the boost circuit module to output and increase the maximum running power limit of the air conditioning load, otherwise the target control instruction is to control the boost circuit module to output and update the maximum power limit of the air conditioning load to the second power threshold after delaying for a first preset time.

9. The method of claim 5, wherein, The target control instruction is determined according to the current period weather condition and the next period weather condition, comprising: judging whether the next period weather condition is cloudy; if the next period weather condition is cloudy, judging whether the current period weather condition is cloudy or little cloudy or sunny; if the current period weather condition is cloudy or little cloudy or sunny, the target control instruction is to control the boost circuit module to output and increase the maximum running power limit of the air conditioning load, otherwise the target control instruction is to control the boost circuit module to output and update the maximum power limit of the air conditioning load to the second power threshold after delaying for a first preset time.

10. The method of claim 5, wherein, The target control instruction is determined according to the current period weather condition and the next period weather condition, comprising: judging whether the next period weather condition is cloudy; if the next period weather condition is cloudy, judging whether the current period weather condition is cloudy or little cloudy or sunny; if the current period weather condition is cloudy or little cloudy or sunny, the target control instruction is to control the boost circuit module to output and increase the maximum running power limit of the air conditioning load, otherwise the target control instruction is to control the boost circuit module to output and update the maximum power limit of the air conditioning load to the second power threshold after delaying for a first preset time. The target control instruction is determined according to the current period weather condition and the next period weather condition, comprising: judging whether the next period weather condition is cloudy; if the next period weather condition is cloudy, judging whether the current period weather condition is cloudy or little cloudy or sunny; if the current period weather condition is cloudy or little cloudy or sunny, the target control instruction is to control the boost circuit module to output and increase the maximum running power limit of the air conditioning load, otherwise the target control instruction is to control the boost circuit module to output and update the maximum power limit of the air conditioning load to the second power threshold after delaying for a first preset time. The target control instruction is determined according to the current period weather condition and the next period weather condition, comprising: judging whether the next period weather condition is cloudy; if the next period weather condition is cloudy, judging whether the current period weather condition is cloudy or little cloudy or sunny; if the current period weather condition is cloudy or little cloudy or sunny, the target control instruction is to control the boost circuit module to output and increase the maximum running power limit of the air conditioning load, otherwise the target control instruction is to control the boost circuit module to output and update the maximum power limit of the air conditioning load to the second power threshold after delaying for a first preset time.

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