Photovoltaic air conditioner and control method thereof

Abstract

The invention provides a photovoltaic air conditioner and a control method thereof, and the photovoltaic air conditioner is configured as follows: when a photovoltaic module supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, an open-circuit voltage is obtained; when the open-circuit voltage does not exceed the maximum allowable input voltage, obtaining the maximum power point voltage and the photovoltaic output voltage; when the maximum power point voltage exceeds the minimum allowable input voltage, or the maximum power point voltage does not exceed the minimum allowable input voltage and the open-circuit voltage exceeds the minimum allowable input voltage, the compressor is controlled to increase the operation frequency according to the first preset frequency, and when the maximum operation frequency is not reached, the compressor is controlled to increase the operation frequency according to the first preset frequency; according to the photovoltaic output voltage, the compressor is controlled to increase the operation frequency according to the second preset frequency until the power of the maximum power point of the photovoltaic air conditioner is larger than or equal to the maximum consumption power, and the risks that the working point of the photovoltaic air conditioner is out of control and the photovoltaic air conditioner cannot work normally are prevented; and the photovoltaic air conditioner can stably operate within a certain power range.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a photovoltaic air conditioner and a control method thereof. Background Art

[0002] Photovoltaic systems generate electricity, generally by connecting to the grid through an inverter or storing energy through batteries. In the above application scenarios, the maximum power point tracking method needs to be used to maintain the photovoltaic system at the maximum output power to provide output power for the photovoltaic air conditioner, or an active PFC (Power Factor Correction) control method is used to provide output power for the photovoltaic air conditioner.

[0003] However, when the photovoltaic system continues to operate at maximum output power, the photovoltaic air conditioner is easily damaged because it has no energy storage function; when working in an environment where the photovoltaic system is directly powered, due to the particularity of the photovoltaic output volt-ampere characteristics, the photovoltaic air conditioner may lose control of the operating point and fail to work normally, resulting in the photovoltaic air conditioner being unable to operate stably. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, an object of the present invention is to provide a photovoltaic air conditioner, which prevents the risk of the photovoltaic air conditioner's operating point being out of control and the photovoltaic air conditioner being unable to operate normally, and allows the photovoltaic air conditioner to operate stably within a certain power range.

[0006] To this end, a second object of the present invention is to provide a control method for a photovoltaic air conditioner.

[0007] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a photovoltaic air conditioner, which includes: a compressor, which is used to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to a condenser; a controller, which is configured to: when the photovoltaic component supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, obtain the open circuit voltage output by the photovoltaic array; when the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, obtain the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array; when the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, control the compressor to increase the operating frequency according to a first preset frequency, and when the operating frequency of the compressor does not reach the maximum operating frequency, control the compressor to increase the operating frequency according to a second preset frequency according to the photovoltaic output voltage until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, wherein the second preset frequency is less than the first preset frequency.

[0008] According to the photovoltaic air conditioner of the embodiment of the present invention, by obtaining the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array when the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, when the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, the photovoltaic air conditioner starts to work, controls the compressor to increase the operating frequency according to the first preset frequency, and detects the operating frequency of the compressor in real time. When the operating frequency of the compressor does not reach the maximum operating frequency, the working state of the photovoltaic air conditioner is adjusted according to the photovoltaic output voltage, that is, the frequency is increased at a slower second preset frequency, to prevent the photovoltaic air conditioner from having the risk of losing control of the working point and the photovoltaic air conditioner not being able to work normally, so that the photovoltaic air conditioner can operate stably within a certain power range.

[0009] In some embodiments, the compressor is controlled to increase the operating frequency according to a second preset frequency based on the photovoltaic output voltage until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner. The controller is configured to: when the photovoltaic output voltage exceeds the sum of the maximum power voltage and the voltage offset, control the compressor to increase the operating frequency according to the second preset frequency, and control the compressor to increase the operating frequency according to the photovoltaic output voltage and the maximum power point voltage until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner.

[0010] In some embodiments, when controlling the compressor to increase its operating frequency according to the photovoltaic output voltage and the maximum power point voltage, the controller is configured as follows: during the process of the compressor increasing its operating frequency according to the second preset frequency, if the operating frequency of the compressor has not reached the maximum operating frequency and the photovoltaic output voltage is not equal to the maximum power point voltage, the compressor is controlled to increase its operating frequency according to the second preset frequency until the operating frequency of the compressor reaches the maximum operating frequency, or the photovoltaic output voltage is equal to the maximum power point voltage.

[0011] In some embodiments, the compressor is controlled to increase its operating frequency according to a second preset frequency based on the photovoltaic output voltage until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner. The controller is configured to: when the photovoltaic output voltage does not exceed the minimum allowable input voltage, control the boost circuit of the photovoltaic air conditioner to turn on, so as to control the compressor to increase its operating frequency according to the second preset frequency, and detect the operating frequency of the compressor after the operating frequency is increased; when the operating frequency of the compressor after the operating frequency is increased does not reach the maximum operating frequency, control the compressor to increase its operating frequency according to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset, until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner.

[0012] In some embodiments, the compressor is controlled to increase its operating frequency according to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner. The controller is configured as follows: if the photovoltaic output voltage does not exceed the sum of the maximum power voltage and the voltage offset, the compressor is controlled to increase its operating frequency according to the second preset frequency, and the operating frequency of the compressor after the operating frequency is increased is detected; when the operating frequency of the compressor after the operating frequency is increased does not reach the maximum operating frequency, the compressor is controlled to increase its operating frequency according to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset until the maximum power point power of the photovoltaic air conditioner is equal to the maximum power consumption of the photovoltaic air conditioner.

[0013] In some embodiments, after the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, the controller is further configured to: obtain the current operating frequency of the photovoltaic air conditioner, and control the photovoltaic air conditioner to execute the action of increasing or decreasing the operating frequency of the compressor according to the current operating frequency.

[0014] In some embodiments, when the operating frequency of the compressor reaches the maximum operating frequency, the controller is further configured to: control the photovoltaic air conditioner to operate at the maximum operating frequency, and control the photovoltaic air conditioner to execute the action of increasing or decreasing the operating frequency of the compressor according to the maximum operating frequency.

[0015] In some embodiments, when the open circuit voltage exceeds the maximum allowable input voltage of the photovoltaic air conditioner, the controller is further configured to: obtain the number of times the open circuit voltage exceeds the maximum allowable input voltage of the photovoltaic air conditioner; when the number is greater than a preset number threshold, output a prompt message that the voltage of the photovoltaic air conditioner is too high, and control the photovoltaic air conditioner to stop working.

[0016] In some embodiments, when the maximum power point does not exceed the minimum allowable input voltage and the open circuit voltage does not exceed the minimum allowable input voltage, a prompt message indicating that the photovoltaic air conditioner voltage is too low is output.

[0017] In order to achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes a control method for a photovoltaic air conditioner, the control method comprising: when the photovoltaic component supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, obtaining the open circuit voltage output by the photovoltaic array; when the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, obtaining the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array; when the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, controlling the compressor to increase the operating frequency according to a first preset frequency, and when the operating frequency of the compressor does not reach the maximum operating frequency, controlling the compressor to increase the operating frequency according to a second preset frequency according to the photovoltaic output voltage until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, wherein the second preset frequency is less than the first preset frequency.

[0018] According to the control method of the photovoltaic air conditioner of the embodiment of the present invention, by obtaining the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array when the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, when the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, the photovoltaic air conditioner starts to work, controls the compressor to increase the operating frequency according to the first preset frequency, and detects the operating frequency of the compressor in real time. When the operating frequency of the compressor does not reach the maximum operating frequency, the working state of the photovoltaic air conditioner is adjusted according to the photovoltaic output voltage, that is, the frequency is increased at a slower second preset frequency, so as to prevent the risk of the working point of the photovoltaic air conditioner being out of control and the photovoltaic air conditioner not being able to work normally, so as to make the photovoltaic air conditioner operate stably within a certain power range.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic diagram of a PFC control method of the related art;

[0022] Figure 2 It is a schematic diagram of the photovoltaic array safety characteristic curve;

[0023] Figure 3 is a structural block diagram of a photovoltaic air conditioner according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of the working principle of a photovoltaic air conditioner according to an embodiment of the present invention;

[0025] Figure 5 is a schematic diagram of a photovoltaic array safety characteristic curve according to an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of a photovoltaic array safety characteristic curve according to another embodiment of the present invention;

[0027] Figure 7 is a flow chart of a control method of a photovoltaic air conditioner according to an embodiment of the present invention;

[0028] Figure 8 is a flow chart of a control method for a photovoltaic air conditioner according to an embodiment of the present invention.

[0029] Reference numerals: photovoltaic air conditioner 1;

[0030] Compressor 11; Controller 12. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0032] In the related technology, the photovoltaic system adopts the maximum power point tracking control method. When the photovoltaic system continues to work at the maximum output power, that is, P PV_max , greater than the power consumption P of the photovoltaic air conditioner KT_max At this time, since the photovoltaic air conditioner has no energy storage function, it will cause damage to the photovoltaic air conditioner components.

[0033] Or Figure 1 The figure shows a schematic diagram of a PFC control method of the related art. The photovoltaic system adopts a universal active PFC (Power Factor Correction) control method, which can work stably and reliably under a conventional power supply environment to ensure the normal operation of photovoltaic air conditioners or other electrical appliances.

[0034] However, when the photovoltaic system adopts the maximum power point tracking control method, it is necessary to keep the real-time output power of the photovoltaic system consistent with the required power of the photovoltaic air conditioner or other electrical appliances, otherwise there is a risk of damage to the photovoltaic air conditioner or other electrical appliances; or when the photovoltaic system adopts the general active PFC control method, when the photovoltaic system is directly used to power the photovoltaic air conditioner or other electrical appliances, due to the particularity of the photovoltaic output volt-ampere characteristics, in a specific area of ​​the photovoltaic performance curve, such as Figure 2 When the photovoltaic operating point is out of control in the unstable range shown, the photovoltaic air conditioner or other electrical appliances cannot work properly.

[0035] Therefore, the photovoltaic air conditioner of the embodiment of the present invention, under the condition of direct power supply from a photovoltaic system such as a photovoltaic module, adaptively controls the working state of the photovoltaic air conditioner or electrical appliances according to photovoltaic output characteristics such as photovoltaic output voltage, so as to control the photovoltaic air conditioner to operate stably within a certain power range, prevent the photovoltaic air conditioner from being easily damaged when the photovoltaic system maintains the maximum power output state, and reduce the phenomenon of the photovoltaic operating point getting out of control in a specific area of ​​the photovoltaic performance curve, resulting in the photovoltaic air conditioner being unable to work normally.

[0036] Reference below Figure 2-Figure 7 The photovoltaic air conditioner 1 according to the embodiment of the present invention is described by way of example.

[0037] like Figure 3 , which is a structural block diagram of a photovoltaic air conditioner according to an embodiment of the present invention. The photovoltaic air conditioner 1 comprises: a compressor 11 and a controller 12, wherein:

[0038] The compressor 11 is used to compress the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharge it to the condenser; the controller 12 is configured to: when the photovoltaic component supplies power to the photovoltaic air conditioner 1 and the photovoltaic air conditioner 1 operates in a stable environment, obtain the open-circuit voltage output by the photovoltaic array; when the open-circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner 1, obtain the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array; when the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open-circuit voltage exceeds the minimum allowable input voltage, control the compressor 11 to increase the operating frequency according to the first preset frequency, and when the operating frequency of the compressor 11 does not reach the maximum operating frequency, control the compressor 11 to increase the operating frequency according to the second preset frequency according to the photovoltaic output voltage, until the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, wherein the second preset frequency is less than the first preset frequency.

[0039] In an embodiment, Figure 4 The figure shows a schematic diagram of the working principle of a photovoltaic air conditioner according to an embodiment of the present invention. When the photovoltaic module supplies power to the photovoltaic air conditioner 1 and the photovoltaic air conditioner 1 is operated for the first time, the controller 12 reads the current region and month, retrieves the photovoltaic data of the current region and month, and sets the independent variable m=0; then, the photovoltaic air conditioner 1 determines whether the weather change in the current month is stable according to the retrieved current photovoltaic data. If the weather change in the current month is unstable, the control method of adaptive power point tracking is adopted to make the photovoltaic air conditioner 1 work stably; if the weather change in the current month is stable, it is considered that the photovoltaic air conditioner 1 is operating in a stable environment, and the open circuit voltage output by the photovoltaic array is obtained, for example, recorded as Uoc.

[0040] After obtaining the open circuit voltage Uoc output by the photovoltaic array, determine the difference between the open circuit voltage Uoc and the maximum allowable input voltage U in_max The size relationship is that when the open circuit voltage Uoc does not exceed the maximum allowable input voltage U of the photovoltaic air conditioner 1 in_max , that is U oc ≤U in_max When the voltage provided by the photovoltaic module is considered to be within the maximum safe voltage range allowed by the photovoltaic air conditioner 1, the photovoltaic air conditioner 1 can work normally. The maximum power point voltage of the photovoltaic array is calculated according to the open circuit voltage Uoc, for example, recorded as Um, that is, Um = a% Uoc, for example, a = 80. It should be noted that the calculated maximum power point voltage Um of the photovoltaic array is greater than the maximum power point voltage U of the actual photovoltaic curve. m_ideal, so that the photovoltaic air conditioner 1 operates in the stable working area on the right side of the photovoltaic volt-ampere characteristic curve, avoiding the photovoltaic working point from getting out of control when operating in an unstable interval, causing the photovoltaic air conditioner 1 or other electrical appliances to fail to work normally, and obtaining the photovoltaic output voltage in real time, for example, recorded as Upv.

[0041] like Figure 5 The figure is a schematic diagram of the photovoltaic array safety characteristic curve of an embodiment of the present invention. When the maximum power point voltage Um exceeds the minimum allowable input voltage U in_min , that is, Um≥U in_min When the photovoltaic air conditioner 1 starts working from point A, the compressor 11 is controlled to increase the operating frequency according to the first preset frequency, and the operating frequency of the compressor 11 is detected in real time to determine whether the operating frequency of the compressor 11 is equal to the maximum operating frequency, for example, denoted as f max The magnitude relationship is that when the operating frequency of the compressor 11 does not reach the maximum operating frequency f max When the photovoltaic output voltage Upv is used, the compressor 11 is controlled to increase the operating frequency at a second preset frequency, that is, at a relatively slow speed, to adjust the working state of the photovoltaic air conditioner 1 until the maximum power point power P of the photovoltaic air conditioner 1 is reached. PV_max Greater than or equal to the maximum power consumption P of the photovoltaic air conditioner 1 KT_max , that is, P PV_max >P KT_max .

[0042] Or Figure 6 The figure is a schematic diagram of the photovoltaic array safety characteristic curve of an embodiment of the present invention. When the maximum power point voltage Um does not exceed the minimum allowable input voltage U in_min And the open circuit voltage U oc Exceeding the minimum allowable input voltage U in_min , that is, Um<U in_min AndU oc ≥U in_min When the photovoltaic air conditioner 1 starts to work from point D, the compressor 11 is controlled to increase the operating frequency according to the first preset frequency, and the operating frequency of the compressor 11 is detected in real time to determine whether the operating frequency of the compressor 11 is equal to the maximum operating frequency, for example, denoted as f max The magnitude relationship is that when the operating frequency of the compressor 11 does not reach the maximum operating frequency f max When the photovoltaic output voltage Upv is used, the compressor 11 is controlled to increase the operating frequency at a second preset frequency, that is, at a relatively slow speed, to adjust the working state of the photovoltaic air conditioner 1 until the maximum power point power P of the photovoltaic air conditioner 1 is reached. PV_max Greater than or equal to the maximum power consumption P of the photovoltaic air conditioner 1 KT_max , that is, P PV_max >P KT_maxBy controlling the operating frequency of the compressor 11 according to the photovoltaic output voltage, the photovoltaic air conditioner 1 can be stably operated within a certain power range, thereby preventing the photovoltaic air conditioner 1 from having the risk of losing control of the operating point and failing to work normally.

[0043] According to the photovoltaic air conditioner 1 of the embodiment of the present invention, by obtaining the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array when the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner 1, when the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, the photovoltaic air conditioner 1 starts to work, controls the compressor 11 to increase the operating frequency according to the first preset frequency, and detects the operating frequency of the compressor 11 in real time. When the operating frequency of the compressor 11 does not reach the maximum operating frequency, the working state of the photovoltaic air conditioner 1 is adjusted according to the photovoltaic output voltage, that is, the frequency is increased at a slower second preset frequency, so as to prevent the photovoltaic air conditioner 1 from having the risk of losing control of the working point and failing to work normally, so that the photovoltaic air conditioner 1 can operate stably within a certain power range.

[0044] In some embodiments, the compressor 11 is controlled to increase the operating frequency according to a second preset frequency based on the photovoltaic output voltage until the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum power consumption of the photovoltaic air conditioner 1. The controller is configured as follows: when the photovoltaic output voltage exceeds the sum of the maximum power voltage and the voltage offset, the compressor 11 is controlled to increase the operating frequency according to the second preset frequency, and the compressor 11 is controlled to increase the operating frequency according to the photovoltaic output voltage and the maximum power point voltage until the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum power consumption of the photovoltaic air conditioner 1.

[0045] In an embodiment, when the maximum power point voltage Um exceeds the minimum allowable input voltage U in_min , that is, Um≥U in_min When the operating frequency of the compressor 11 does not reach the maximum operating frequency f max , and the photovoltaic output voltage Upv exceeds the sum of the maximum power voltage Um and the voltage offset ΔU, that is, Upv≥Um+ΔU, the compressor 11 is controlled to increase the operating frequency according to the second preset frequency, and according to the relationship between the photovoltaic output voltage Upv and the maximum power point voltage Um, the compressor 11 is controlled to increase the operating frequency until the maximum power point power P of the photovoltaic air conditioner 1 PV_max Greater than or equal to the maximum power consumption P of the photovoltaic air conditioner 1 KT_max , that is, P PV_max >P KT_max .

[0046] In some embodiments, when the compressor 11 is controlled to increase its operating frequency according to the photovoltaic output voltage and the maximum power point voltage, the controller is configured as follows: during the process of the compressor 11 increasing its operating frequency according to the second preset frequency, if the operating frequency of the compressor 11 has not reached the maximum operating frequency and the photovoltaic output voltage is not equal to the maximum power point voltage, the compressor 11 is controlled to increase its operating frequency according to the second preset frequency until the operating frequency of the compressor 11 reaches the maximum operating frequency, or the photovoltaic output voltage is equal to the maximum power point voltage.

[0047] In the embodiment, during the process in which the controller 12 controls the compressor 11 to increase the operating frequency according to the second preset frequency, if the operating frequency of the compressor 11 does not reach the maximum operating frequency f max , and the photovoltaic output voltage Upv is not equal to the maximum power point voltage Um, that is, Upv≠Um. It is believed that the operating power of the photovoltaic air conditioner 1 is about to reach the maximum power of the photovoltaic output. If the photovoltaic air conditioner 1 frequency increases too fast, the maximum power consumption P of the photovoltaic air conditioner 1 will be KT_max Exceeding the maximum power point power P PV_max , that is, P KT_max >P PV_max , causing the photovoltaic air conditioner 1 to be unable to operate normally, so in the interval B→C, the compressor 11 is controlled to increase the operating frequency at a slower speed according to the second preset frequency until the operating frequency of the compressor 11 reaches the maximum operating frequency f max , or, the photovoltaic output voltage Upv is equal to the maximum power point voltage Um, that is, Upv = Um.

[0048] In some embodiments, the compressor 11 is controlled to increase the operating frequency according to a second preset frequency according to the photovoltaic output voltage until the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum power consumption of the photovoltaic air conditioner 1. The controller 12 is configured as follows: when the photovoltaic output voltage does not exceed the minimum allowable input voltage, the boost circuit of the photovoltaic air conditioner 1 is controlled to start, so as to control the compressor 11 to increase the operating frequency according to the second preset frequency, and detect the operating frequency of the compressor 11 after the operating frequency is increased; when the operating frequency of the compressor 11 after the operating frequency is increased does not reach the maximum operating frequency, the compressor 11 is controlled to increase the operating frequency according to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset, until the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum power consumption of the photovoltaic air conditioner 1.

[0049] In the embodiment, when the photovoltaic output voltage Upv does not exceed the minimum allowable input voltage U in_min , that is U pv <U in_min, the controller 12 controls the boost circuit of the photovoltaic air conditioner 1 to start, so as to control the compressor 11 to increase the operating frequency according to the second preset frequency, and detect the operating frequency of the compressor 11 after the operating frequency is increased; when the operating frequency of the compressor 11 after the operating frequency is increased does not reach the maximum operating frequency f max When the maximum power point power P of the photovoltaic air conditioner 1 is reached, the compressor 11 is controlled to increase the operating frequency according to the relationship between the photovoltaic output voltage Upv and the sum of the maximum power voltage Um and the voltage offset ΔU. PV_max Greater than or equal to the maximum power consumption P of the photovoltaic air conditioner 1 KT_max , that is, P PV_max >P KT_max .

[0050] In some embodiments, the compressor 11 is controlled to increase the operating frequency according to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset until the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum power consumption of the photovoltaic air conditioner 1. The controller 12 is configured as follows: if the photovoltaic output voltage does not exceed the sum of the maximum power voltage and the voltage offset, the compressor 11 is controlled to increase the operating frequency according to the second preset frequency, and the operating frequency of the compressor 11 after the operating frequency is increased is detected; when the operating frequency of the compressor 11 after the operating frequency is increased does not reach the maximum operating frequency, the compressor 11 is controlled to increase the operating frequency according to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset until the maximum power point power of the photovoltaic air conditioner 1 is equal to the maximum power consumption of the photovoltaic air conditioner 1.

[0051] In the embodiment, the operating frequency of the compressor 11 after the operating frequency is increased does not reach the maximum operating frequency f max When the photovoltaic output voltage Upv does not exceed the sum of the maximum power voltage Um and the voltage offset ΔU, that is, Upv<Um+ΔU, the compressor 11 is controlled to increase the operating frequency according to the second preset frequency to prevent the compressor 11 from generating frequency too fast, which will cause the maximum power consumption P of the photovoltaic air conditioner 1 to KT_max Exceeding the maximum power point power P PV_max , that is, P KT_max >P PV_max , and detect the operating frequency of the compressor 11 after the operating frequency is increased. The operating frequency of the compressor 11 after the operating frequency is increased does not reach the maximum operating frequency f max When the photovoltaic output voltage Upv is not equal to the maximum power point voltage Um, that is, Upv≠Um, the compressor 11 is controlled to increase the operating frequency according to the relationship between the photovoltaic output voltage Upv, the maximum power point voltage Um and the voltage offset ΔU; after the compressor 11 increases the operating frequency, the operating frequency reaches the maximum operating frequency f max, or when the photovoltaic output voltage is equal to Upv and the maximum power point voltage Um, that is, Upv=Um, it is considered that the maximum power point power P of the photovoltaic air conditioner 1 PV_max Greater than or equal to the maximum power consumption P of the photovoltaic air conditioner 1 KT_max , that is, P PV_max >P KT_max .

[0052] In some embodiments, after the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum power consumption of the photovoltaic air conditioner 1, the controller 12 is also configured to: obtain the current operating frequency of the photovoltaic air conditioner 1, and control the photovoltaic air conditioner 1 to execute the action of increasing or decreasing the operating frequency of the compressor 11 according to the current operating frequency.

[0053] In the embodiment, after the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum power consumption of the photovoltaic air conditioner 1, the current operating frequency of the photovoltaic air conditioner 1 is obtained, for example, recorded as f c , and control the photovoltaic air conditioner 1 to operate at a frequency not exceeding the current operating frequency f c In this case, the compressor 11 increases or decreases its operating frequency.

[0054] In some embodiments, when the operating frequency of the compressor 11 reaches the maximum operating frequency, the controller 12 is also configured to: control the photovoltaic air conditioner 1 to operate at the maximum operating frequency, and control the photovoltaic air conditioner 1 to execute the action of increasing or decreasing the operating frequency of the compressor 11 according to the maximum operating frequency.

[0055] In the embodiment, when the operating frequency of the compressor 11 reaches the maximum operating frequency f max When the controller 12 controls the photovoltaic air conditioner 1 to operate at the maximum frequency f max Maintain operation, control the photovoltaic air conditioner 1 to not exceed the maximum operating frequency f max In the case of, the compressor 11 increases or decreases the operating frequency, such as Figure 5 As shown, at this time, the photovoltaic air conditioner 1 works on the curve A→C.

[0056] Or when the operating frequency of the compressor 11 reaches the maximum operating frequency f max When the controller 12 controls the photovoltaic air conditioner 1 to operate at the maximum frequency f max Maintain operation, control the photovoltaic air conditioner 1 to not exceed the maximum operating frequency f max In the case of, the compressor 11 increases or decreases the operating frequency, such as Figure 6 As shown, at this time, the photovoltaic air conditioner 1 works on the curve D→F.

[0057] In some embodiments, when the open circuit voltage exceeds the maximum allowable input voltage of the photovoltaic air conditioner 1, the controller 12 is further configured to: obtain the number of times the open circuit voltage exceeds the maximum allowable input voltage of the photovoltaic air conditioner 1; when the number is greater than a preset threshold, output a prompt message that the voltage of the photovoltaic air conditioner 1 is too high, and control the photovoltaic air conditioner 1 to stop working.

[0058] In the embodiment, the open circuit voltage Uoc is determined to be equal to the maximum allowable input voltage U in_max When the open circuit voltage Uoc exceeds the maximum allowable input voltage U in_max When the open circuit voltage Uoc is too high, the photovoltaic air conditioner 1 cannot be turned on. Then the open circuit voltage Uoc exceeds the maximum allowable input voltage U in_max The number of times is, for example, recorded as m. When the number m is greater than the preset number threshold, for example 3, that is, m>3, it is considered that the voltage provided by the photovoltaic component exceeds the maximum safe voltage range allowed by the photovoltaic air conditioner 1, and the photovoltaic air conditioner 1 cannot work normally, then a prompt message that the voltage of the photovoltaic air conditioner 1 is too high is output, and the photovoltaic air conditioner 1 is controlled to stop working; if the number m is less than or equal to the preset number threshold 3, that is, m≤3, then wait for half an hour before obtaining the open-circuit voltage Uoc output by the photovoltaic array again.

[0059] In some embodiments, when the maximum power point does not exceed the minimum allowable input voltage and the open circuit voltage does not exceed the minimum allowable input voltage, a prompt message indicating that the voltage of the photovoltaic air conditioner 1 is too low is output.

[0060] In the embodiment, the minimum allowable input voltage U is not exceeded at the maximum power point Um. in_min And the open circuit voltage U oc Does not exceed the minimum allowable input voltage U in_min , that is, Um<U in_min AndU oc <U in_min When the photovoltaic air conditioner 1 fails, a prompt message indicating that the voltage of the photovoltaic air conditioner 1 is too low is output, so that the user can understand the cause of the failure of the photovoltaic air conditioner 1.

[0061] Combine the following Figure 7 The control method of the photovoltaic air conditioner according to the embodiment of the present invention is illustrated by way of example.

[0062] like Figure 7 As shown, the control method of the photovoltaic air conditioner according to the embodiment of the present invention at least includes steps S11 to S36.

[0063] Step S11, the photovoltaic assembly supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment.

[0064] Step S12, obtaining the open circuit voltage output by the photovoltaic array.

[0065] Step S13, determining whether the open circuit voltage does not exceed the maximum allowable input voltage, if so, executing step S14; otherwise, executing step S15.

[0066] Step S14, obtaining the maximum power point voltage and photovoltaic output voltage of the photovoltaic array.

[0067] Step S15, obtaining the number of times the open circuit voltage exceeds the maximum allowable input voltage of the photovoltaic air conditioner.

[0068] Step S16, determine whether the number of times is greater than a preset number threshold, if so, execute step S17; otherwise, execute step S15.

[0069] Step S17, outputting a prompt message indicating that the photovoltaic air conditioner voltage is too high, and controlling the photovoltaic air conditioner to stop working.

[0070] Step S18, determining whether the maximum power point voltage exceeds the minimum allowable input voltage, if so, executing step S21; otherwise, executing step S19.

[0071] Step S19, determining whether the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, if so, executing step S21; otherwise, executing step S20.

[0072] Step S20, outputting a prompt message indicating that the photovoltaic air conditioner voltage is too low.

[0073] Step S21, controlling the compressor to increase the operating frequency according to a first preset frequency.

[0074] Step S22, determining whether the operating frequency of the compressor has not reached the maximum operating frequency, if so, executing steps S24 and S29; otherwise, executing step S23.

[0075] Step S23, controlling the photovoltaic air conditioner to operate at a maximum operating frequency, and controlling the photovoltaic air conditioner to execute an action of increasing or decreasing the operating frequency of the compressor according to the maximum operating frequency.

[0076] Step S24, determining whether the photovoltaic output voltage exceeds the sum of the maximum power voltage and the voltage offset, if so, executing step S25; otherwise, executing step S26.

[0077] Step S25, controlling the compressor to increase the operating frequency according to the second preset frequency.

[0078] Step S26, determining whether the operating frequency of the compressor has not reached the maximum operating frequency and the photovoltaic output voltage is not equal to the maximum power point voltage. If so, executing step S27; otherwise, executing step S24.

[0079] Step S27, controlling the compressor to increase the operating frequency according to the second preset frequency until the operating frequency of the compressor reaches the maximum operating frequency, or the photovoltaic output voltage is equal to the maximum power point voltage.

[0080] Step S28, until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner.

[0081] Step S29, determining whether the photovoltaic output voltage does not exceed the minimum allowable input voltage, if so, executing step S30; otherwise, executing step S21.

[0082] Step S30, controlling the boost circuit of the photovoltaic air conditioner to start, so as to control the compressor to increase the operating frequency according to the second preset frequency, and detecting the operating frequency of the compressor after the operating frequency is increased.

[0083] Step S31, determining whether the operating frequency of the compressor after the operating frequency is increased has not reached the maximum operating frequency, if so, executing step S32; otherwise, executing step S23.

[0084] Step S32, determining whether the photovoltaic output voltage does not exceed the sum of the maximum power voltage and the voltage offset, if so, executing step S33; otherwise, executing step S30.

[0085] Step S33, controlling the compressor to increase the operating frequency according to the second preset frequency, and detecting the operating frequency of the compressor after the operating frequency is increased.

[0086] Step S34, determining whether the operating frequency of the compressor after the operating frequency is increased has not reached the maximum operating frequency, if so, executing step S35; otherwise, executing step S23.

[0087] Step S35, controlling the compressor to increase the operating frequency according to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset, until the maximum power point power of the photovoltaic air conditioner is equal to the maximum power consumption of the photovoltaic air conditioner.

[0088] Step S36, obtaining the current operating frequency of the air conditioner, and controlling the photovoltaic air conditioner to execute the action of increasing or decreasing the operating frequency of the compressor according to the current operating frequency.

[0089] According to the photovoltaic air conditioner 1 of the embodiment of the present invention, by obtaining the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array when the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner 1, when the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, the photovoltaic air conditioner 1 starts to work, controls the compressor 11 to increase the operating frequency according to the first preset frequency, and detects the operating frequency of the compressor 11 in real time. When the operating frequency of the compressor does not reach the maximum operating frequency, the working state of the photovoltaic air conditioner 1 is adjusted according to the photovoltaic output voltage, that is, the frequency is increased at a slower second preset frequency, so as to prevent the photovoltaic air conditioner 1 from having the risk of losing control of the working point and failing to work normally, so that the photovoltaic air conditioner 1 can operate stably within a certain power range.

[0090] Combine the following Figure 8 The control method of the photovoltaic air conditioner according to the embodiment of the present invention is illustrated by way of example.

[0091] like Figure 8 As shown, the control method of the photovoltaic air conditioner according to the embodiment of the present invention at least includes steps S1 to S3.

[0092] Step S1, when the photovoltaic component supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, an open circuit voltage output by the photovoltaic array is obtained.

[0093] In an embodiment, when the photovoltaic component supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner is operated for the first time, the controller reads the current region and month, and retrieves the photovoltaic data of the current region and month, and sets the independent variable m=0; then, the photovoltaic air conditioner determines whether the weather changes in the region in the current month are stable based on the retrieved current photovoltaic data. If the weather changes in the current month are unstable, an adaptive power point tracking control method is used to make the photovoltaic air conditioner work stably; if the weather changes in the current month are stable, it is considered that the photovoltaic air conditioner is operating in a stable environment, and the open circuit voltage of the photovoltaic array output is obtained, for example, recorded as Uoc.

[0094] Step S2, when the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, obtaining the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array.

[0095] In the embodiment, after obtaining the open circuit voltage Uoc output by the photovoltaic array, it is determined whether the open circuit voltage Uoc is equal to the maximum allowable input voltage U in_max The size relationship is that when the open circuit voltage Uoc does not exceed the maximum allowable input voltage U in_max , that is U oc ≤U in_maxWhen the voltage provided by the photovoltaic module is considered to be within the maximum safe voltage range allowed by the photovoltaic air conditioner, the photovoltaic air conditioner can work normally. The maximum power point voltage of the photovoltaic array is calculated according to the open circuit voltage Uoc, for example, recorded as Um, that is, Um = a% Uoc, for example a = 80. It should be noted that the calculated maximum power point voltage Um of the photovoltaic array is greater than the maximum power point voltage U of the actual photovoltaic curve. m_ideal , so that the photovoltaic air conditioner operates in the stable working area on the right side of the photovoltaic volt-ampere characteristic curve, avoiding the photovoltaic working point from getting out of control when operating in an unstable interval, causing the photovoltaic air conditioner or other electrical appliances to fail to work normally, and obtaining the photovoltaic output voltage in real time, for example, recorded as Upv.

[0096] Step S3, when the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, control the compressor to increase the operating frequency according to the first preset frequency, and when the operating frequency of the compressor does not reach the maximum operating frequency, control the compressor to increase the operating frequency according to the second preset frequency according to the photovoltaic output voltage, until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, wherein the second preset frequency is less than the first preset frequency.

[0097] In an embodiment, when the maximum power point voltage Um exceeds the minimum allowable input voltage U in_min , that is, Um≥U in_min When the photovoltaic air conditioner starts working from point A, the compressor is controlled to increase the operating frequency according to the first preset frequency, and the operating frequency of the compressor is detected in real time to determine whether the operating frequency of the compressor is equal to the maximum operating frequency, for example, denoted as f max The size relationship is that when the operating frequency of the compressor does not reach the maximum operating frequency f max When the PV output voltage Upv is used, the compressor is controlled to increase the operating frequency at a second preset frequency, that is, at a relatively slow speed, to adjust the working state of the PV air conditioner until the maximum power point power P of the PV air conditioner is reached. PV_max Greater than or equal to the maximum power consumption P of the photovoltaic air conditioner KT_max , that is, P PV_max >P KT_max .

[0098] Or the voltage Um at the maximum power point does not exceed the minimum allowable input voltage U in_min And the open circuit voltage U oc Exceeding the minimum allowable input voltage U in_min , that is, Um<U in_min AndU oc ≥U in_minWhen the photovoltaic air conditioner starts working from point D, the compressor is controlled to increase the operating frequency according to the first preset frequency, and the operating frequency of the compressor is detected in real time to determine whether the operating frequency of the compressor is equal to the maximum operating frequency, for example, denoted as f max The size relationship is that when the operating frequency of the compressor does not reach the maximum operating frequency f max When the PV output voltage Upv is used, the compressor is controlled to increase the operating frequency at a second preset frequency, that is, at a relatively slow speed, to adjust the working state of the PV air conditioner until the maximum power point power P of the PV air conditioner is reached. PV_max Greater than or equal to the maximum power consumption P of the photovoltaic air conditioner KT_max , that is, P PV_max >P KT_max By controlling the operating frequency of the compressor according to the photovoltaic output voltage, the photovoltaic air conditioner can operate stably within a certain power range, preventing the risk of the photovoltaic air conditioner's operating point being out of control and the photovoltaic air conditioner not being able to work normally.

[0099] According to the control method of the photovoltaic air conditioner of the embodiment of the present invention, by obtaining the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array when the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, when the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, the photovoltaic air conditioner starts to work, controls the compressor to increase the operating frequency according to the first preset frequency, and detects the operating frequency of the compressor in real time. When the operating frequency of the compressor does not reach the maximum operating frequency, the working state of the photovoltaic air conditioner is adjusted according to the photovoltaic output voltage, that is, the frequency is increased at a slower second preset frequency, so as to prevent the risk of the working point of the photovoltaic air conditioner being out of control and the photovoltaic air conditioner not being able to work normally, so as to make the photovoltaic air conditioner operate stably within a certain power range.

[0100] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0101] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A photovoltaic air conditioner, characterized in that: include: The compressor is used to compress the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to the condenser; The controller is configured to: when the photovoltaic component supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, obtain an open circuit voltage output by the photovoltaic array; When the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, obtaining the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array; When the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, the compressor is controlled to increase the operating frequency according to a first preset frequency, and when the operating frequency of the compressor does not reach the maximum operating frequency, the compressor is controlled to increase the operating frequency according to a second preset frequency according to the photovoltaic output voltage until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, wherein the second preset frequency is less than the first preset frequency.

2. The photovoltaic air conditioner according to claim 1, characterized in that: According to the photovoltaic output voltage, the compressor is controlled to increase the operating frequency according to a second preset frequency until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, and the controller is configured as follows: When the photovoltaic output voltage exceeds the sum of the maximum power voltage and the voltage offset, the compressor is controlled to increase the operating frequency according to the second preset frequency, and the compressor is controlled to increase the operating frequency according to the photovoltaic output voltage and the maximum power point voltage until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner.

3. The photovoltaic air conditioner according to claim 2, characterized in that: When controlling the compressor to increase the operating frequency according to the photovoltaic output voltage and the maximum power point voltage, the controller is configured as follows: During the process of increasing the operating frequency of the compressor according to the second preset frequency, if the operating frequency of the compressor has not reached the maximum operating frequency and the photovoltaic output voltage is not equal to the maximum power point voltage, the compressor is controlled to increase the operating frequency according to the second preset frequency until the operating frequency of the compressor reaches the maximum operating frequency, or the photovoltaic output voltage is equal to the maximum power point voltage.

4. The photovoltaic air conditioner according to claim 1, characterized in that: According to the photovoltaic output voltage, the compressor is controlled to increase the operating frequency according to a second preset frequency until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, and the controller is configured as follows: When the photovoltaic output voltage does not exceed the minimum allowable input voltage, controlling the boost circuit of the photovoltaic air conditioner to start, so as to control the compressor to increase the operating frequency according to the second preset frequency, and detecting the operating frequency of the compressor after the operating frequency is increased; When the operating frequency of the compressor does not reach the maximum operating frequency after the operating frequency is increased, the compressor is controlled to increase the operating frequency according to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner.

5. The photovoltaic air conditioner according to claim 4, characterized in that: According to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset, the compressor is controlled to increase the operating frequency until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, and the controller is configured as follows: If the photovoltaic output voltage does not exceed the sum of the maximum power voltage and the voltage offset, controlling the compressor to increase the operating frequency according to the second preset frequency, and detecting the operating frequency of the compressor after the operating frequency is increased; When the operating frequency of the compressor does not reach the maximum operating frequency after the operating frequency is increased, the compressor is controlled to increase the operating frequency according to the sum of the photovoltaic output voltage, the maximum power voltage and the voltage offset until the maximum power point power of the photovoltaic air conditioner is equal to the maximum power consumption of the photovoltaic air conditioner.

6. The photovoltaic air conditioner according to claim 1, characterized in that: After the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, the controller is further configured to: The current operating frequency of the photovoltaic air conditioner is acquired, and the photovoltaic air conditioner is controlled to execute an action of increasing or decreasing the operating frequency of the compressor according to the current operating frequency.

7. The photovoltaic air conditioner according to claim 1, characterized in that: When the operating frequency of the compressor reaches the maximum operating frequency, the controller is further configured to: The photovoltaic air conditioner is controlled to operate at the maximum operating frequency, and the photovoltaic air conditioner is controlled to execute an action of increasing or decreasing the operating frequency of the compressor according to the maximum operating frequency.

8. The photovoltaic air conditioner according to claim 1, characterized in that: When the open circuit voltage exceeds the maximum allowable input voltage of the photovoltaic air conditioner, the controller is further configured to: Obtaining the number of times the open circuit voltage exceeds the maximum allowable input voltage of the photovoltaic air conditioner; When the number of times is greater than a preset number threshold, a prompt message indicating that the photovoltaic air conditioner voltage is too high is output, and the photovoltaic air conditioner is controlled to stop working.

9. The photovoltaic air conditioner according to claim 1, characterized in that: When the maximum power point does not exceed the minimum allowable input voltage and the open circuit voltage does not exceed the minimum allowable input voltage, a prompt message indicating that the photovoltaic air conditioner voltage is too low is output.

10. A control method for a photovoltaic air conditioner, characterized in that: include: When the photovoltaic component supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, obtaining an open circuit voltage output by the photovoltaic array; When the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, obtaining the maximum power point voltage and the photovoltaic output voltage of the photovoltaic array; When the maximum power point voltage exceeds the minimum allowable input voltage, or when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage exceeds the minimum allowable input voltage, the compressor is controlled to increase the operating frequency according to a first preset frequency, and when the operating frequency of the compressor does not reach the maximum operating frequency, the compressor is controlled to increase the operating frequency according to a second preset frequency according to the photovoltaic output voltage until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum power consumption of the photovoltaic air conditioner, wherein the second preset frequency is less than the first preset frequency.

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