Photovoltaic air conditioner with substrate protection function

Abstract

The invention relates to the field of photovoltaic air conditioner control, in particular to a photovoltaic air conditioner with a substrate protection function, comprising: a heat dissipation unit for dissipating heat generated by operation of an air conditioner host to outdoor air, the heat dissipation unit comprising a heat dissipation motor and a first temperature sensor; the photovoltaic power generation unit comprises a photovoltaic substrate and a second temperature sensor; the energy storage unit is used for storing the electric energy; the power grid interaction unit is used for determining the energy storage electric quantity proportion of the energy storage unit according to the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate; and the compensation control unit is used for judging whether to start a power grid to compensate the voltage of the air conditioner or not according to the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage, and determining whether to adjust the rotating speed of the heat dissipation motor or not according to the temperature of the air around the photovoltaic substrate and the heat dissipation temperature of the heat dissipation motor. According to the invention, reasonable distribution of electric energy is realized, and the operation stability of the photovoltaic air conditioner is improved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic air conditioners, and in particular to a photovoltaic air conditioner with a substrate protection function. Background Art

[0002] In the context of global response to climate change and energy transformation, the use of renewable energy has received widespread attention. As a clean and renewable energy source, solar energy has developed rapidly in photovoltaic power generation technology. Photovoltaic air conditioners have emerged as the times require. They combine solar photovoltaic power generation with air conditioning systems, convert solar energy into electrical energy through photovoltaic panels, and provide power for the operation of air conditioners, thereby reducing dependence on traditional power grid electricity and reducing carbon emissions. Photovoltaic substrates are the core components of photovoltaic systems in photovoltaic air conditioners, and their performance directly affects the power generation efficiency. However, photovoltaic substrates face challenges from a variety of environmental factors during actual use; in addition, photovoltaic substrates also face the risk of mechanical damage. During installation and use, they may be impacted by natural disasters such as hail and sandstorms, as well as the risk of mechanical damage. In summary, in order to improve the performance and service life of photovoltaic substrates in photovoltaic air conditioners and ensure the stable operation of photovoltaic air conditioners, it is very necessary to develop a photovoltaic air conditioner with a perfect substrate protection function. This protection function should not only be able to cope with the influence of various environmental factors, but also have an intelligent monitoring and protection mechanism, so as to give full play to the advantages of photovoltaic air conditioners and promote the effective application of renewable energy in the field of air conditioning.

[0003] Chinese patent publication number CN103486682B discloses a photovoltaic air conditioning system, including a photovoltaic cell array, an air conditioning unit, a converter unit, and a DC bus. A converter unit is provided between the public power grid and the inverter unit. The capacity of the converter unit is configured according to the needs of the photovoltaic cell array or the public power grid. The air conditioning unit is provided with an inverter unit as a standard component of the unit. The DC power emitted by the photovoltaic cell array and the DC power emitted after rectification by the converter unit are supplied to the inverter unit to power the unit. It can be seen that the photovoltaic air conditioning system has the problem of inaccurate monitoring of the influence of the ambient temperature or the heat dissipation temperature of the air conditioner outdoor unit on the operation of the photovoltaic air conditioner and the interference of the heat dissipation water droplets discharged from the air conditioner of other users above the air conditioner on the heat dissipation of the air conditioner downstairs, which leads to the problem of reduced operation stability of the photovoltaic air conditioner. Summary of the invention

[0004] To this end, the present invention provides a photovoltaic air conditioner with a substrate protection function, which is used to overcome the problems in the prior art of inaccurate monitoring of the impact of ambient temperature or the heat dissipation temperature of the air conditioner outdoor unit on the operation of the photovoltaic air conditioner and interference of heat dissipation of the air conditioner downstairs due to heat droplets discharged from the air conditioners of other users above the air conditioner, thereby reducing the operating stability of the photovoltaic air conditioner.

[0005] To achieve the above object, the present invention provides a photovoltaic air conditioner with a substrate protection function, comprising an air conditioner host, and further comprising:

[0006] A heat dissipation unit connected to the air conditioner main unit for dissipating heat generated by the operation of the air conditioner main unit into outdoor air, comprising a heat dissipation motor for providing heat dissipation power and a first temperature sensor connected to the heat dissipation motor for detecting the heat dissipation temperature of the heat dissipation motor;

[0007] A photovoltaic power generation unit, which is arranged above the heat dissipation unit, comprises a photovoltaic substrate arranged above the heat dissipation motor for converting solar energy into electrical energy and a second temperature sensor connected to the photovoltaic substrate for detecting the air temperature around the photovoltaic substrate;

[0008] An energy storage unit, connected to the photovoltaic power generation unit, for storing the electrical energy;

[0009] A power grid interaction unit, which is connected to the photovoltaic power generation unit and the energy storage unit respectively, and is used to determine the energy storage power ratio of the energy storage unit according to the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate;

[0010] A compensation control unit is respectively connected to the air conditioner host, the heat dissipation unit, the photovoltaic power generation unit, the energy storage unit and the grid interaction unit, and determines whether to start the grid voltage compensation for the air conditioner according to the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage, and determines whether to adjust the speed of the heat dissipation motor according to the air temperature around the photovoltaic substrate and the heat dissipation temperature of the heat dissipation motor.

[0011] Furthermore, the photovoltaic power generation unit further comprises:

[0012] A photovoltaic controller, which is connected to the photovoltaic substrate and is used to control the electric energy generated by the photovoltaic substrate 7;

[0013] The photovoltaic substrate support is connected to the photovoltaic substrate and is used to fix the position of the photovoltaic substrate.

[0014] Furthermore, the energy storage unit comprises:

[0015] A lithium battery pack connected to the photovoltaic substrate and used to store the electrical energy generated by the photovoltaic substrate;

[0016] The inverter is connected to the lithium battery pack and is used to convert the direct current of the lithium battery pack into alternating current for the air conditioner host.

[0017] Furthermore, the power grid interaction unit includes:

[0018] A switch, which is respectively connected to the inverter and the power supply line of the air conditioner host, and is used to control the power supply mode of the air conditioner host;

[0019] A circuit breaker connected to the power supply lines of the power grid and the air conditioner host, respectively, for cutting off the power supply of the power grid to the photovoltaic air conditioner when a fault or current overload occurs in the photovoltaic air conditioner;

[0020] The power supply modes include power supply from the power grid to the air conditioner host alone and power supply from the power grid and the photovoltaic power generation unit to the air conditioner host in coordination.

[0021] Furthermore, the power generation efficiency of the photovoltaic substrate is the ratio of the output electric power of the photovoltaic substrate to the surface solar radiation power of the photovoltaic substrate.

[0022] Further, the grid interaction unit is connected to the second temperature sensor, the photovoltaic substrate and the energy storage unit respectively, so as to obtain the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate, and calculate the linear fit between the power generation efficiency of the photovoltaic substrate and the air temperature around the photovoltaic substrate at several sampling moments;

[0023] If the linear fit is greater than a preset linear fit, the compensation control unit determines that the influence of the ambient temperature on the power generation efficiency of the photovoltaic substrate does not meet the requirements, and adjusts the energy storage power ratio of the energy storage unit.

[0024] Furthermore, the energy storage capacity ratio of the energy storage unit is the ratio of the current storage capacity of the lithium battery pack to the maximum storage capacity of the lithium battery pack.

[0025] Furthermore, the fluctuation amplitude of the photovoltaic power generation voltage is the difference between the maximum power generation voltage and the minimum power generation voltage of the photovoltaic substrate within a number of sampling periods.

[0026] Furthermore, the compensation control unit is respectively connected to the photovoltaic substrate, the energy storage unit and the grid interaction unit, and is also used to obtain the fluctuation amplitude of the photovoltaic power generation voltage and the power generation efficiency of the photovoltaic substrate;

[0027] Under the condition that the air temperature around the photovoltaic substrate is within the preset ambient temperature range and the power generation efficiency of the photovoltaic substrate is less than the preset power generation efficiency, if the fluctuation amplitude of the photovoltaic power generation voltage is greater than the preset fluctuation amplitude, the compensation control unit determines that the stability of the power grid does not meet the requirements, and starts the power grid to compensate the voltage of the air conditioner;

[0028] The compensated voltage of the air conditioner is determined by the difference between the fluctuation amplitude of the photovoltaic power generation voltage and a preset fluctuation amplitude.

[0029] Furthermore, the compensation control unit is connected to the photovoltaic substrate, the first temperature sensor and the heat dissipation unit respectively, and is also used to obtain the heat dissipation temperature of the heat dissipation motor, and calculate the difference between the decrease in the heat dissipation temperature of the heat dissipation motor and the increase in the air temperature around the photovoltaic substrate.

[0030] If the difference is less than a preset difference, the compensation control unit determines that the influence of the heat dissipated by the heat dissipation motor on the air temperature around the photovoltaic substrate exceeds an allowable range, and increases the rotation speed of the heat dissipation motor.

[0031] Compared with the prior art, the beneficial effects of the present invention lie in that the photovoltaic air conditioner of the present invention comprehensively determines the energy storage power ratio of the energy storage unit according to the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate by setting a heat dissipation unit, a photovoltaic power generation unit, an energy storage unit, a power grid interaction unit and a compensation control unit, thereby overcoming the problem of unstable power generation of the photovoltaic substrate under different weather and light conditions and improving the efficiency of energy utilization; judging whether to start the power grid voltage compensation for the air conditioner according to the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage, thereby overcoming the problem of abnormal air conditioning voltage caused by changes in photovoltaic power generation efficiency and unstable power grid voltage itself and improving the safety of photovoltaic air conditioner use; determining whether to adjust the speed of the heat dissipation motor according to the air temperature around the photovoltaic substrate and the heat dissipation temperature of the heat dissipation motor, thereby overcoming the problem of equipment failure caused by poor heat dissipation of the air conditioner outdoor unit and improving the overall operation efficiency and stability of the photovoltaic air conditioner.

[0032] Furthermore, the photovoltaic air conditioner described in the present invention converts the direct current generated by the photovoltaic substrate into alternating current by setting a photovoltaic power generation unit, thereby overcoming the problem that the electric energy generated by the photovoltaic substrate cannot be adapted to electrical equipment or cannot interact with the power grid, and improving the versatility of the power generated by the photovoltaic air conditioner.

[0033] Furthermore, the photovoltaic air conditioner described in the present invention can achieve fast charging and discharging performance by setting up an energy storage unit and applying lithium batteries, and sets a photovoltaic inverter to adapt to the lithium battery pack, thereby overcoming the problem of battery damage caused by excessive charging voltage or excessive current, and reducing the risk of energy supply interruption.

[0034] Furthermore, the photovoltaic air conditioner of the present invention overcomes the problem of unstable grid operation due to unbalanced load of power allocation by setting up a grid interaction unit and accurately measuring the power transmitted from the photovoltaic substrate to the grid, thereby improving the stability of the operation of the photovoltaic air conditioner.

[0035] Furthermore, the photovoltaic air conditioner described in the present invention sets a preset linear fit, obtains the ambient temperature and power generation efficiency of the photovoltaic substrate, and determines the energy storage power ratio of the energy storage unit by combining these two key factors, thereby overcoming the problem of excessive or insufficient storage of electricity due to ambient temperature or weather conditions. Excessive storage may cause self-discharge losses in the energy storage device, while insufficient storage may not be able to meet electricity demand during subsequent peak power consumption or poor light periods, thereby improving the efficiency of the coordinated operation of the entire photovoltaic power generation unit and the energy storage unit.

[0036] Furthermore, the photovoltaic air conditioner described in the present invention sets a preset fluctuation amplitude, and the compensation control unit obtains the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage to determine whether to start the grid voltage compensation for the air conditioner, thereby overcoming the problem of unstable voltage received by the photovoltaic air conditioner due to power peaks and power equipment failures, reducing the problems of frequent starting and stopping of the photovoltaic air conditioner and poor cooling or heating effects due to voltage abnormalities, and improving the safety and stability of the operation of the photovoltaic air conditioner.

[0037] Furthermore, the photovoltaic air conditioner described in the present invention sets a preset difference, and the compensation control unit determines whether to adjust the rotation speed of the heat dissipation motor by obtaining the air temperature around the photovoltaic substrate and the heat dissipation temperature of the heat dissipation motor, thereby overcoming the problem that the heat dissipation temperature of the external unit increases due to long-term operation of the air conditioner, thereby causing the air temperature around the photovoltaic substrate to increase, and then causing the power generation efficiency of the photovoltaic substrate to decrease, and reducing the risk of system failure caused by mutual influence between equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the overall structure of a photovoltaic air conditioner with a substrate protection function according to an embodiment of the present invention;

[0039] Figure 2 This is a structural block diagram of a photovoltaic air conditioner with a substrate protection function according to an embodiment of the present invention;

[0040] Figure 3 This is a structural block diagram of a photovoltaic power generation unit of a photovoltaic air conditioner with a substrate protection function according to an embodiment of the present invention;

[0041] Figure 4 This is a logic flow chart of a photovoltaic air conditioner with a substrate protection function according to an embodiment of the present invention;

[0042] The figure numbers are as follows: 1-air conditioner indoor unit, 2-first temperature sensor, 3-air conditioner outdoor unit, 4-cooling fan, 5-photovoltaic substrate bracket, 6-second temperature sensor, 7-photovoltaic substrate. DETAILED DESCRIPTION

[0043] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0045] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in this specification refers to the presence of features, integers, steps, operations, elements / components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements / components. It should be understood that when we refer to a unit as being "connected" or "coupled" to another unit, it may be directly connected or coupled to the other unit, or there may be intermediate units. In addition, "connected" or "coupled" used herein may include wireless connection or wireless coupling.

[0046] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively the overall structural schematic diagram of the photovoltaic air conditioner with substrate protection function according to the embodiment of the present invention, the structural block diagram, the structural block diagram of the photovoltaic power generation unit and the logic flow chart. A photovoltaic air conditioner with substrate protection function according to the embodiment of the present invention includes an air conditioner host, and also includes:

[0047] A heat dissipation unit, which is connected to the air conditioner main unit and is used to dissipate the heat generated by the operation of the air conditioner main unit into the outdoor air, and includes a heat dissipation motor for providing heat dissipation power and a first temperature sensor 2 connected to the heat dissipation motor for detecting the heat dissipation temperature of the heat dissipation motor;

[0048] A photovoltaic power generation unit, which is arranged above the heat dissipation unit, comprises a photovoltaic substrate 7 arranged above the heat dissipation motor for converting solar energy into electrical energy and a second temperature sensor 6 connected to the photovoltaic substrate 7 for detecting the air temperature around the photovoltaic substrate 7;

[0049] An energy storage unit, connected to the photovoltaic power generation unit, for storing the electrical energy;

[0050] A grid interaction unit, which is connected to the photovoltaic power generation unit and the energy storage unit respectively, and is used to determine the energy storage power ratio of the energy storage unit according to the air temperature around the photovoltaic substrate 7 and the power generation efficiency of the photovoltaic substrate 7;

[0051] A compensation control unit is respectively connected to the air conditioner host, the heat dissipation unit, the photovoltaic power generation unit, the energy storage unit and the grid interaction unit, and determines whether to start the grid voltage compensation for the air conditioner according to the power generation efficiency of the photovoltaic substrate 7 and the fluctuation amplitude of the photovoltaic power generation voltage, and determines whether to adjust the speed of the heat dissipation motor according to the air temperature around the photovoltaic substrate 7 and the heat dissipation temperature of the heat dissipation motor.

[0052] Specifically, the first temperature sensor 2 may be an infrared temperature sensor or a gas temperature sensor. A preferred embodiment of the first temperature sensor is a gas temperature sensor.

[0053] Specifically, the second temperature sensor 6 can be an infrared temperature sensor or a gas temperature sensor, and a preferred embodiment is a gas temperature sensor.

[0054] Specifically, the heat dissipation temperature of the heat dissipation motor is the temperature of the high-temperature gas output by the heat dissipation motor.

[0055] In practice, the photovoltaic air conditioner of the present invention is provided with a heat dissipation unit, a photovoltaic power generation unit, an energy storage unit, a grid interaction unit and a compensation control unit, and comprehensively determines the energy storage power ratio of the energy storage unit according to the air temperature around the photovoltaic substrate 7 and the power generation efficiency of the photovoltaic substrate 7, thereby overcoming the problem of unstable power generation of the photovoltaic substrate 7 due to different weather and light conditions, and improving the efficiency of energy utilization; judging whether to start the grid voltage compensation for the air conditioner according to the power generation efficiency of the photovoltaic substrate 7 and the fluctuation amplitude of the photovoltaic power generation voltage, thereby overcoming the problem of abnormal air conditioning voltage caused by changes in photovoltaic power generation efficiency and unstable grid voltage itself, and improving the safety of photovoltaic air conditioning; determining whether to adjust the speed of the heat dissipation motor according to the air temperature around the photovoltaic substrate 7 and the heat dissipation temperature of the heat dissipation motor, thereby overcoming the problem of equipment failure caused by poor heat dissipation of the air conditioner outdoor unit, and improving the overall operation efficiency and stability of the photovoltaic air conditioner.

[0056] Specifically, the air conditioner host includes:

[0057] A compressor (not shown) for compressing gaseous refrigerant;

[0058] A condenser (not shown), which is connected to the compressor and is used to cool the gaseous refrigerant discharged from the compressor;

[0059] an evaporator (not shown), connected to the condenser, for vaporizing the gaseous refrigerant discharged from the condenser;

[0060] The heat dissipation fan 4 is connected to the condenser and the evaporator respectively, and is used for exchanging heat between the outdoor air and the gaseous refrigerant in the evaporator.

[0061] Specifically, the photovoltaic power generation unit also includes:

[0062] A photovoltaic controller (not shown), which is connected to the photovoltaic substrate 7 and is used to control the electric energy generated by the photovoltaic substrate 7;

[0063] The photovoltaic substrate support 5 is connected to the photovoltaic substrate 7 and is used to fix the position of the photovoltaic substrate 7 .

[0064] In practice, the photovoltaic air conditioner of the present invention converts the direct current generated by the photovoltaic substrate 7 into alternating current by setting up a photovoltaic power generation unit, thereby overcoming the problem that the electric energy generated by the photovoltaic substrate 7 cannot be adapted to electrical equipment or cannot interact with the power grid, thereby improving the versatility of the power generated by the photovoltaic air conditioner.

[0065] Specifically, the energy storage unit includes:

[0066] A lithium battery pack (not shown), which is connected to the photovoltaic substrate and is used to store the electrical energy generated by the photovoltaic substrate 7;

[0067] The inverter is connected to the lithium battery pack and is used to convert the direct current of the lithium battery pack into alternating current for the air conditioner host.

[0068] In practice, the photovoltaic air conditioner described in the present invention can achieve fast charging and discharging performance by setting up an energy storage unit and applying lithium batteries, and sets a photovoltaic inverter to adapt to the lithium battery pack, thereby overcoming the problem of battery damage caused by excessive charging voltage or excessive current, and reducing the risk of energy supply interruption.

[0069] Specifically, the power grid interaction unit includes:

[0070] A switch (not shown), which is connected to the inverter and the power supply circuit of the air conditioner host, respectively, to control the power supply mode of the air conditioner host;

[0071] A circuit breaker (not shown), which is connected to the power supply lines of the power grid and the air conditioner host, respectively, and is used to cut off the power supply of the power grid to the photovoltaic air conditioner when the photovoltaic air conditioner fails or the current is overloaded;

[0072] The power supply modes include power supply from the power grid to the air conditioner host alone and power supply from the power grid and the photovoltaic power generation unit to the air conditioner host in coordination.

[0073] Those skilled in the art can understand that there is no limitation on the type of switch, as long as the power supply mode of the air conditioner host can be controlled, and those skilled in the art can make adaptive adjustments to the type of switch in actual applications.

[0074] In practice, the photovoltaic air conditioner of the present invention overcomes the problem of unstable grid operation caused by unbalanced load of power allocation by setting up a grid interaction unit and accurately measuring the power transmitted from the photovoltaic substrate 7 to the grid, thereby improving the stability of the operation of the photovoltaic air conditioner.

[0075] Specifically, the power generation efficiency of the photovoltaic substrate is the ratio of the output electric power of the photovoltaic substrate to the surface solar radiation power of the photovoltaic substrate.

[0076] In implementation, the surface solar radiation power of the photovoltaic substrate 7 is the product of the solar radiation power density measured by a solar radiometer and the area of ​​the photovoltaic substrate 7 .

[0077] Specifically, the solar radiation power density is the actual radiation power density measured by a solar radiometer, with the unit of watts per square meter.

[0078] Specifically, the grid interaction unit is connected to the second temperature sensor 6, the photovoltaic substrate 7 and the energy storage unit respectively, so as to obtain the air temperature around the photovoltaic substrate 7 and the power generation efficiency of the photovoltaic substrate 7, and calculate the linear fit between the power generation efficiency of the photovoltaic substrate 7 and the air temperature around the photovoltaic substrate 7 at several sampling moments;

[0079] If the linear fit is greater than a preset linear fit, the compensation control unit determines that the influence of the ambient temperature on the power generation efficiency of the photovoltaic substrate 7 does not meet the requirements, and adjusts the energy storage power ratio of the energy storage unit.

[0080] In implementation, a number of sampling moments are selected at equal time intervals and the linear fit between the power generation efficiency of the photovoltaic substrate 7 and the air temperature around the photovoltaic substrate 7 at the number of sampling moments is calculated.

[0081] Specifically, the linear fit is a conventional technical means well known to those skilled in the art, so the calculation process of the linear fit is not described here in detail.

[0082] Optionally, the preset linear fit value range may be [1.3, 1.6];

[0083] Preferably, the preferred embodiment of the preset linear fit degree is 1.5.

[0084] In a specific embodiment, the linear fit is 1.7, which is greater than the preset linear fit. The compensation control unit determines that the influence of the ambient temperature on the power generation efficiency of the photovoltaic substrate 7 does not meet the requirements. For every 0.1 increase in the linear fit over the preset linear fit, the energy storage power ratio of the energy storage unit increases by 2% compared with the current energy storage power ratio. The current energy storage power ratio is 60%, and the increased energy storage power ratio is 60+(1.7-1.5) / 0.1×2=64%.

[0085] Specifically, the linear fit between the power generation efficiency of the photovoltaic substrate 7 and the air temperature around the photovoltaic substrate 7 is the degree of influence of the air temperature around the photovoltaic substrate 7 on the power generation efficiency of the photovoltaic substrate 7 per unit time. The calculation method of the linear fit between the power generation efficiency of the photovoltaic substrate 7 and the air temperature around the photovoltaic substrate 7 is an existing technology well known to those skilled in the art, so the calculation method of the linear fit will not be elaborated here.

[0086] In practice, the photovoltaic air conditioner of the present invention sets a preset linear fit, obtains the ambient temperature and power generation efficiency of the photovoltaic substrate 7, and combines these two key factors to determine the energy storage power ratio of the energy storage unit, thereby overcoming the problem of excessive or insufficient storage of electricity due to ambient temperature or weather conditions. Excessive storage may cause self-discharge losses in the energy storage device, while insufficient storage may not be able to meet electricity demand during subsequent peak electricity consumption or poor light periods, thereby improving the efficiency of the coordinated operation of the entire photovoltaic power generation unit and the energy storage unit.

[0087] Specifically, the energy storage capacity ratio of the energy storage unit is the ratio of the current storage capacity of the lithium battery pack to the maximum storage capacity of the lithium battery pack.

[0088] Specifically, the fluctuation amplitude of the photovoltaic power generation voltage is the difference between the maximum power generation voltage and the minimum power generation voltage of the photovoltaic substrate within a number of sampling periods.

[0089] Specifically, the compensation control unit is respectively connected to the photovoltaic substrate 7, the energy storage unit and the grid interaction unit, and is also used to obtain the fluctuation amplitude of the photovoltaic power generation voltage and the power generation efficiency of the photovoltaic substrate 7;

[0090] Under the condition that the air temperature around the photovoltaic substrate 7 is within the preset ambient temperature range and the power generation efficiency of the photovoltaic substrate 7 is less than the preset power generation efficiency, if the fluctuation amplitude of the photovoltaic power generation voltage is greater than the preset fluctuation amplitude, the compensation control unit determines that the stability of the power grid does not meet the requirements, and starts the power grid to compensate the voltage of the air conditioner;

[0091] The compensated voltage of the air conditioner is determined by the difference between the fluctuation amplitude of the photovoltaic power generation voltage and a preset fluctuation amplitude.

[0092] Optionally, the preset ambient temperature range may be in the range of [20° C., 27° C.], the preset power generation efficiency may be in the range of [17%, 25%], and the preset fluctuation amplitude may be in the range of [1V, 4V].

[0093] Preferably, the preferred embodiment of the preset ambient temperature range is [23° C., 25° C.], the preferred embodiment of the preset power generation efficiency is 20%, and the preferred embodiment of the preset fluctuation amplitude is 2V.

[0094] In a specific embodiment, the air temperature around the photovoltaic substrate 7 is 24°C, the power generation efficiency of the photovoltaic substrate 7 is 20%, and the fluctuation amplitude of the photovoltaic power generation voltage is 3V, which is greater than the preset fluctuation amplitude. The grid starts to compensate the air conditioner for the voltage. For every 1V that the fluctuation amplitude of the photovoltaic power generation voltage is greater than the preset fluctuation amplitude, the grid increases the voltage compensation for the air conditioner by 0.6V compared with the current voltage compensation. The current voltage compensation is 2V, and the increased voltage compensation is 2+(3-2)×0.6=2.6V.

[0095] In practice, the photovoltaic air conditioner of the present invention sets a preset fluctuation amplitude, and the compensation control unit obtains the power generation efficiency of the photovoltaic substrate 7 and the fluctuation amplitude of the photovoltaic power generation voltage to determine whether to start the grid voltage compensation for the air conditioner, thereby overcoming the problem of unstable voltage received by the photovoltaic air conditioner due to power peaks and power equipment failures, reducing the problems of frequent starting and stopping of the photovoltaic air conditioner and poor cooling or heating effects due to voltage abnormalities, and improving the safety and stability of the operation of the photovoltaic air conditioner.

[0096] Specifically, the compensation control unit is connected to the photovoltaic substrate 7, the first temperature sensor 2 and the heat dissipation unit respectively, and is also used to obtain the heat dissipation temperature of the heat dissipation motor, and calculate the difference between the decrease in the heat dissipation temperature of the heat dissipation motor and the increase in the air temperature around the photovoltaic substrate 7.

[0097] If the difference is less than a preset difference, the compensation control unit determines that the influence of the heat dissipated by the heat dissipation motor on the air temperature around the photovoltaic substrate 7 exceeds an allowable range, and increases the rotation speed of the heat dissipation motor.

[0098] Optionally, the preset difference value may be in the range of [5°C, 8°C];

[0099] Preferably, the preset difference is 6°C.

[0100] In a specific embodiment, the difference between the decrease in the heat dissipation temperature of the air conditioner outdoor unit and the increase in the air temperature around the photovoltaic substrate 7 is 5°C, which is less than the preset difference. For every 1°C that the difference between the decrease in the heat dissipation temperature of the air conditioner outdoor unit and the increase in the air temperature around the photovoltaic substrate 7 is less than the preset difference, the speed of the heat dissipation motor of the air conditioner outdoor unit increases by 10% compared with the current speed of the heat dissipation motor of the air conditioner outdoor unit. The current speed of the heat dissipation motor of the air conditioner outdoor unit is 2000r / min, and the increased speed of the heat dissipation motor of the air conditioner outdoor unit is 2000r / min.

[0101] In implementation, the photovoltaic air conditioner of the present invention sets a preset difference, and the compensation control unit determines whether to adjust the rotation speed of the heat dissipation motor by obtaining the air temperature around the photovoltaic substrate 7 and the heat dissipation temperature of the heat dissipation motor, thereby overcoming the problem that the heat dissipation temperature of the external unit increases due to long-term operation of the air conditioner, thereby causing the air temperature around the photovoltaic substrate 7 to increase, and then causing the power generation efficiency of the photovoltaic substrate 7 to decrease, and reducing the risk of system failure caused by mutual influence between equipment.

[0102] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A photovoltaic air conditioner with substrate protection function, comprising an air conditioner host, characterized in that: Also includes: A heat dissipation unit connected to the air conditioner main unit for dissipating heat generated by the operation of the air conditioner main unit into outdoor air, comprising a heat dissipation motor for providing heat dissipation power and a first temperature sensor connected to the heat dissipation motor for detecting the heat dissipation temperature of the heat dissipation motor; A photovoltaic power generation unit, which is arranged above the heat dissipation unit, comprises a photovoltaic substrate arranged above the heat dissipation motor for converting solar energy into electrical energy and a second temperature sensor connected to the photovoltaic substrate for detecting the air temperature around the photovoltaic substrate; An energy storage unit, connected to the photovoltaic power generation unit, for storing the electrical energy; A power grid interaction unit, which is connected to the photovoltaic power generation unit and the energy storage unit respectively, and is used to determine the energy storage power ratio of the energy storage unit according to the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate; A compensation control unit is respectively connected to the air conditioner host, the heat dissipation unit, the photovoltaic power generation unit, the energy storage unit and the grid interaction unit, and determines whether to start the grid voltage compensation for the air conditioner according to the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage, and determines whether to adjust the speed of the heat dissipation motor according to the air temperature around the photovoltaic substrate and the heat dissipation temperature of the heat dissipation motor.

2. The photovoltaic air conditioner with substrate protection function according to claim 1, characterized in that: The photovoltaic power generation unit also includes: A photovoltaic controller, which is connected to the photovoltaic substrate and is used to control the electric energy generated by the photovoltaic substrate 7; The photovoltaic substrate support is connected to the photovoltaic substrate and is used to fix the position of the photovoltaic substrate.

3. The photovoltaic air conditioner with substrate protection function according to claim 2 is characterized in that: The energy storage unit comprises: A lithium battery pack connected to the photovoltaic substrate and used to store the electrical energy generated by the photovoltaic substrate; The inverter is connected to the lithium battery pack and is used to convert the direct current of the lithium battery pack into alternating current for the air conditioner host.

4. The photovoltaic air conditioner with substrate protection function according to claim 3 is characterized in that: The power grid interaction unit comprises: A switch, which is respectively connected to the inverter and the power supply line of the air conditioner host, and is used to control the power supply mode of the air conditioner host; A circuit breaker connected to the power supply lines of the power grid and the air conditioner host, respectively, for cutting off the power supply of the power grid to the photovoltaic air conditioner when a fault or current overload occurs in the photovoltaic air conditioner; The power supply modes include power supply from the power grid to the air conditioner host alone and power supply from the power grid and the photovoltaic power generation unit to the air conditioner host in coordination.

5. The photovoltaic air conditioner with substrate protection function according to claim 4 is characterized in that: The power generation efficiency of the photovoltaic substrate is the ratio of the output power of the photovoltaic substrate to the surface solar radiation power of the photovoltaic substrate.

6. The photovoltaic air conditioner with substrate protection function according to claim 5, characterized in that: The grid interaction unit is respectively connected to the second temperature sensor, the photovoltaic substrate and the energy storage unit to obtain the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate, and calculate the linear fit between the power generation efficiency of the photovoltaic substrate and the air temperature around the photovoltaic substrate at several sampling moments; If the linear fit is greater than a preset linear fit, the compensation control unit determines that the influence of the ambient temperature on the power generation efficiency of the photovoltaic substrate does not meet the requirements, and adjusts the energy storage power ratio of the energy storage unit.

7. The photovoltaic air conditioner with substrate protection function according to claim 6, characterized in that: The energy storage capacity ratio of the energy storage unit is the ratio of the current storage capacity of the lithium battery pack to the maximum storage capacity of the lithium battery pack.

8. The photovoltaic air conditioner with substrate protection function according to claim 7, characterized in that: The fluctuation amplitude of the photovoltaic power generation voltage is the difference between the maximum power generation voltage and the minimum power generation voltage of the photovoltaic substrate within a number of sampling periods.

9. The photovoltaic air conditioner with substrate protection function according to claim 8, characterized in that: The compensation control unit is respectively connected to the photovoltaic substrate, the energy storage unit and the grid interaction unit, and is also used to obtain the fluctuation amplitude of the photovoltaic power generation voltage and the power generation efficiency of the photovoltaic substrate; Under the condition that the air temperature around the photovoltaic substrate is within the preset ambient temperature range and the power generation efficiency of the photovoltaic substrate is less than the preset power generation efficiency, if the fluctuation amplitude of the photovoltaic power generation voltage is greater than the preset fluctuation amplitude, the compensation control unit determines that the stability of the power grid does not meet the requirements, and starts the power grid to compensate the voltage of the air conditioner; The compensated voltage of the air conditioner is determined by the difference between the fluctuation amplitude of the photovoltaic power generation voltage and a preset fluctuation amplitude.

10. The photovoltaic air conditioner with substrate protection function according to claim 9, characterized in that: The compensation control unit is connected to the photovoltaic substrate, the first temperature sensor and the heat dissipation unit respectively, and is also used to obtain the heat dissipation temperature of the heat dissipation motor, and calculate the difference between the decrease in the heat dissipation temperature of the heat dissipation motor and the increase in the air temperature around the photovoltaic substrate. If the difference is less than a preset difference, the compensation control unit determines that the influence of the heat dissipated by the heat dissipation motor on the air temperature around the photovoltaic substrate exceeds an allowable range, and increases the rotation speed of the heat dissipation motor.

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