Photovoltaic air conditioner and control method thereof

Abstract

The application provides a photovoltaic air conditioner and a control method thereof. The photovoltaic air conditioner is configured to: 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 a maximum allowed input voltage, a maximum power point voltage and a photovoltaic output voltage are obtained; when the maximum power point voltage exceeds a minimum allowed input voltage, or the maximum power point voltage does not exceed the minimum allowed input voltage and the open circuit voltage exceeds the minimum allowed input voltage, the compressor is controlled to increase the operating frequency according to a first preset frequency, and when the maximum operating frequency is not reached, 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 consumption power. The application prevents the photovoltaic air conditioner from losing control of the operating point and failing to work normally, and enables the photovoltaic air conditioner to operate stably within a certain power range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to a photovoltaic air conditioner and a control method thereof. BACKGROUND

[0002] The photovoltaic system generates electricity, which is generally connected to the power grid through an inverter for power generation or stored in a battery. In the above application scenarios, a maximum power point tracking method is used to maintain the photovoltaic system at the maximum output power, so as to provide output power for the photovoltaic air conditioner. Alternatively, 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 continuously works at the maximum output power, the photovoltaic air conditioner is prone to damage due to the lack of energy storage function. When the photovoltaic system works in a direct power supply environment, the photovoltaic air conditioner is prone to work point out of control and unable to work normally due to the particularity of the photovoltaic output voltage-ampere characteristic, which leads to the photovoltaic air conditioner being unable to run stably. SUMMARY

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

[0005] To this end, one object of the present application is to provide a photovoltaic air conditioner which prevents the photovoltaic air conditioner from being out of control and unable to work normally, so as to enable the photovoltaic air conditioner to run stably within a certain power range.

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

[0007] To achieve the above object, the embodiment of the first aspect of the present application proposes a photovoltaic air conditioner, comprising: a compressor for performing the work of compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging to a condenser; and a controller configured to: when a photovoltaic assembly supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, acquire an open-circuit voltage output by a photovoltaic array; when the open-circuit voltage does not exceed a maximum allowable input voltage of the photovoltaic air conditioner, acquire a maximum power point voltage of the photovoltaic array and a photovoltaic output voltage; when the maximum power point voltage exceeds a 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, 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 a maximum operating frequency, control the compressor 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 consumption power of the photovoltaic air conditioner, wherein the second preset frequency is less than the first preset frequency.

[0008] The photovoltaic air conditioner according to the embodiment of the present application, by acquiring the maximum power point voltage of the photovoltaic array and the photovoltaic output voltage when the open-circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, starting the work of the photovoltaic air conditioner 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, controlling the compressor to increase the operating frequency according to the first preset frequency, and simultaneously detecting the operating frequency of the compressor in real time, adjusting the working state of the photovoltaic air conditioner according to the photovoltaic output voltage when the operating frequency of the compressor does not reach the maximum operating frequency, i.e., increasing the frequency according to the second preset frequency which is relatively slow, preventing the risk of out-of-control working point of the photovoltaic air conditioner and the risk of the photovoltaic air conditioner failing to work normally, and enabling the photovoltaic air conditioner to stably operate within a certain power range.

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

[0010] In some embodiments, when the controller controls the compressor to increase the operating frequency according to the photovoltaic output voltage and the maximum power point voltage, the controller is configured to: if the operating frequency of the compressor does not reach the maximum operating frequency and the photovoltaic output voltage is not equal to the maximum power point voltage, control 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.

[0011] In some embodiments, when the controller controls the compressor to increase the operating 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 consumption power of the photovoltaic air conditioner, the controller is configured to: when the photovoltaic output voltage does not exceed the minimum allowed input voltage, control the step-up circuit of the photovoltaic air conditioner to be turned on to control the compressor to increase the 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 the operating frequency according to the sum of the photovoltaic output voltage and 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 consumption power of the photovoltaic air conditioner.

[0012] In some embodiments, when the controller controls the compressor to increase the operating frequency according to the sum of the photovoltaic output voltage and 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 consumption power of the photovoltaic air conditioner, the controller is configured to: if the photovoltaic output voltage does not exceed 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 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 the operating frequency according to the sum of the photovoltaic output voltage and the maximum power voltage and the voltage offset until the maximum power point power of the photovoltaic air conditioner is equal to the maximum consumption power 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 consumption power 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 perform 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 a 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 perform 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 a number of times that the open circuit voltage exceeds the maximum allowable input voltage of the photovoltaic air conditioner, and when the number of times is greater than a preset number threshold, output prompt information 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, output prompt information that the voltage of the photovoltaic air conditioner is too low.

[0017] To achieve the above-mentioned purpose, embodiments of the second aspect of the present application propose a control method of a photovoltaic air conditioner, the control method comprising: when a photovoltaic assembly supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, obtaining an open circuit voltage output by a photovoltaic array; when the open circuit voltage does not exceed a maximum allowable input voltage of the photovoltaic air conditioner, obtaining a maximum power point voltage of the photovoltaic array and a photovoltaic output voltage; when the maximum power point voltage exceeds a 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, 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 a 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 consumption power 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 present invention, when the open-circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner, the maximum power point voltage and photovoltaic output voltage of the photovoltaic array are obtained. 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 but 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 a first preset frequency, and simultaneously 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 relatively slow second preset frequency, to prevent the photovoltaic air conditioner from having the risk of operating point loss control and the photovoltaic air conditioner failing to work normally, so that the photovoltaic air conditioner can operate stably within a certain power range.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

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

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

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

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

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

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

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

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

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

[0029] Figure label: Photovoltaic air conditioner 1;

[0030] Compressor 11; Controller 12. Detailed Implementation

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

[0032] In related technologies, photovoltaic systems employ maximum power point tracking (MPPT) control. This means that the photovoltaic system continuously operates at its maximum output power, P... PV_max It is greater than the power consumption P of the photovoltaic air conditioner. KT_max At times, because photovoltaic air conditioners do not have energy storage functions, this can cause damage to the photovoltaic air conditioning components.

[0033] Or such as Figure 1 The diagram shown illustrates the PFC control method of the relevant technology. The photovoltaic system adopts the general active PFC (Power Factor Correction) control method, which can operate stably and reliably under normal power supply conditions, ensuring the normal operation of photovoltaic air conditioners or other electrical appliances.

[0034] However, when a photovoltaic (PV) system employs maximum power point tracking (MPPT) control, it is crucial to maintain the real-time output power of the PV system consistent with the power demand of the PV air conditioner or other electrical appliances; otherwise, there is a risk of damage to the PV air conditioner or other electrical appliances. Alternatively, when the PV system uses a general active power point tracking (PFC) control method, if the PV system is directly used to power a PV air conditioner or other electrical appliances, due to the unique characteristics of the PV output voltage-current characteristics, within a specific region of the PV performance curve, for example... Figure 2 When the unstable range shown is reached, it can cause the photovoltaic operating point to go out of control, resulting in photovoltaic air conditioners or other electrical appliances failing to work properly.

[0035] Therefore, the photovoltaic air conditioner of this embodiment of the 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 appliance according to the photovoltaic output characteristics such as the 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 maximum power output, and reduce the phenomenon of photovoltaic operating point loss of control in a specific area of ​​the photovoltaic performance curve, which would cause the photovoltaic air conditioner to fail to work properly.

[0036] The following is for reference. Figures 2-7 The photovoltaic air conditioner 1 of this invention will be illustrated by example.

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

[0038] The compressor 11 is used to compress low-temperature, low-pressure refrigerant gas into high-temperature, high-pressure refrigerant gas and discharge it to the condenser. The controller 12 is configured to: when the photovoltaic module supplies power to the photovoltaic air conditioner 1 and the photovoltaic air conditioner 1 is operating in a stable environment, acquire 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, acquire the maximum power point voltage and 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 but the open-circuit voltage exceeds the minimum allowable input voltage, control the compressor 11 to increase its operating frequency according to a 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 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 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, such as Figure 4 The diagram shown illustrates 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 air conditioner 1 starts operating for the first time, the controller 12 reads the current region and month, retrieves the photovoltaic data for the current region and month, and sets the independent variable m = 0. Then, the photovoltaic air conditioner 1 determines whether the weather changes in the current month are stable based on the retrieved photovoltaic data. If the weather changes are unstable, an adaptive power point tracking control method is used to ensure stable operation of the photovoltaic air conditioner 1. If the weather changes are stable, the photovoltaic air conditioner 1 is considered to be operating in a stable environment, and the open-circuit voltage output by the photovoltaic array is obtained, for example, denoted as Uoc.

[0040] After obtaining the open-circuit voltage Uoc output by the photovoltaic array, determine the relationship between the open-circuit voltage Uoc and the maximum allowable input voltage U of the photovoltaic air conditioner 1. in_max The magnitude relationship is such that 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 If the voltage provided by the photovoltaic module is considered to be within the maximum safe input voltage range of the photovoltaic air conditioner 1, enabling the photovoltaic air conditioner 1 to operate normally, then the maximum power point voltage of the photovoltaic array is calculated based on the open-circuit voltage Uoc, for example denoted as Um, i.e., Um = a%Uoc, where a = 80. It should be noted that the calculated maximum power point voltage Um of the photovoltaic array is greater than the actual maximum power point voltage Uc on the photovoltaic curve. m_idealSo that the photovoltaic air conditioner 1 operates in the right stable working area of the photovoltaic volt-ampere characteristic curve, avoiding the operation in the unstable area, the photovoltaic operating point out of control, resulting in the photovoltaic air conditioner 1 or other electrical appliances cannot work normally, and the photovoltaic output voltage is obtained in real time, for example, denoted as Upv.

[0041] As shown in Figure 5 , it is a schematic diagram of the photovoltaic array characteristic curve of an embodiment of the present application. When the maximum power point voltage Um exceeds the minimum allowable input voltage U in_min , that is, Um≥U in_min , the photovoltaic air conditioner 1 starts to work from point A, controls the compressor 11 to increase the operating frequency according to the first preset frequency, and simultaneously detects the operating frequency of the compressor 11 in real time, judges the size relationship between the operating frequency of the compressor 11 and the maximum operating frequency, for example, denoted as f max , when the operating frequency of the compressor 11 does not reach the maximum operating frequency f max , controls the compressor 11 to increase the operating frequency according to the 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 PV_max of the photovoltaic air conditioner 1 is greater than or equal to the maximum consumption power P KT_max of the photovoltaic air conditioner 1, that is, P PV_max >P KT_max .

[0042] Or as shown in Figure 6 , it is a schematic diagram of the photovoltaic array characteristic curve of an embodiment of the present application. 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 exceeds the minimum allowable input voltage U in_min , that is, Um<U in_min and U oc ≥U in_min , the photovoltaic air conditioner 1 starts to work from point D, controls the compressor 11 to increase the operating frequency according to the first preset frequency, and simultaneously detects the operating frequency of the compressor 11 in real time, judges the size relationship between the operating frequency of the compressor 11 and the maximum operating frequency, for example, denoted as f max , when the operating frequency of the compressor 11 does not reach the maximum operating frequency f max , controls the compressor 11 to increase the operating frequency according to the 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 PV_max of the photovoltaic air conditioner 1 is greater than or equal to the maximum consumption power P KT_max of the photovoltaic air conditioner 1, that is, P PV_max >P KT_maxThe photovoltaic air conditioner 1 is controlled to stably operate within a certain power range by controlling the operating frequency of the compressor 11 according to the photovoltaic output voltage, thereby preventing the photovoltaic air conditioner 1 from losing control of the operating point and failing to operate normally.

[0043] The photovoltaic air conditioner 1 according to the embodiment of the present application is controlled to stably operate within a certain power range by obtaining the maximum power point voltage of the photovoltaic array and the photovoltaic output voltage when the open circuit voltage does not exceed the maximum allowable input voltage of the photovoltaic air conditioner 1, starting the operation 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, controlling the compressor 11 to increase the operating frequency according to the first preset frequency, and simultaneously detecting the operating frequency of the compressor 11 in real time, adjusting the operating state of the photovoltaic air conditioner 1 according to the photovoltaic output voltage, i.e., increasing the frequency at a relatively slow second preset frequency, when the operating frequency of the compressor 11 does not reach the maximum operating frequency, thereby preventing the photovoltaic air conditioner 1 from losing control of the operating point and failing to operate normally.

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

[0045] In the embodiment, when the maximum power point voltage Um exceeds the minimum allowable input voltage U in_min , i.e., Um≥U in_min , the controller 12 controls the compressor 11 to increase the operating frequency according to the second preset frequency 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, i.e., Upv≥Um+ΔU, and controls the compressor 11 to increase the operating frequency according to the relationship between the photovoltaic output voltage Upv and the maximum power point voltage Um until the maximum power point power P PV_max of the photovoltaic air conditioner 1 is greater than or equal to the maximum consumption power P KT_max of the photovoltaic air conditioner 1, i.e., P PV_max >P KT_max .

[0046] In some embodiments, when the controller controls the compressor 11 to increase the operating frequency according to the photovoltaic output voltage and the maximum power point voltage, the controller is configured to: when the operating frequency of the compressor 11 does not reach the maximum operating frequency and the photovoltaic output voltage is not equal to the maximum power point voltage during the process of the compressor 11 increasing the operating frequency at the second preset frequency, control the compressor 11 to increase the operating frequency at 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 an embodiment, when 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, i.e., Upv≠Um, it is considered that the operating power of the photovoltaic air conditioner 1 will soon reach the maximum power of the photovoltaic output. If the frequency of the photovoltaic air conditioner 1 is increased too fast, the maximum power consumption P KT_max of the photovoltaic air conditioner 1 exceeds the maximum power point power P PV_max , i.e., P KT_max >P PV_max , causing the photovoltaic air conditioner 1 to be unable to operate normally. Therefore, in the interval B→C, the controller controls the compressor 11 to increase the operating frequency at the second preset frequency, i.e., at a relatively slow speed, 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, i.e., Upv=Um.

[0048] In some embodiments, when the controller controls the compressor 11 to increase the operating frequency at the second preset frequency 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 according to the photovoltaic output voltage, the controller 12 is configured to: when the photovoltaic output voltage does not exceed the minimum allowed input voltage, control the boost circuit of the photovoltaic air conditioner 1 to be turned on to control the compressor 11 to increase the operating frequency at 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, control the compressor 11 to increase the operating frequency according to the sum of the photovoltaic output voltage and 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 an embodiment, when the photovoltaic output voltage Upv does not exceed the minimum allowed input voltage U in_min , i.e., U pv <U in_minWhen the running frequency of the compressor 11 after the increase is less than the maximum running frequency, the controller 12 controls the compressor 11 to increase the running 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 until the maximum power point power P max of the photovoltaic air conditioner 1 is greater than or equal to the maximum consumption power P PV_max of the photovoltaic air conditioner 1, and detects the running frequency of the compressor 11 after the increase. KT_max That is, P PV_max >P KT_max .

[0050] In some embodiments, when the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum consumption power P of the photovoltaic air conditioner 1 according to the relationship between the photovoltaic output voltage and the sum of the maximum power voltage and the voltage offset, the controller 12 is configured to: if the photovoltaic output voltage does not exceed the sum of the maximum power voltage and the voltage offset, control the compressor 11 to increase the running frequency according to the second preset frequency, and detect the running frequency of the compressor 11 after the increase; when the running frequency of the compressor 11 after the increase does not reach the maximum running frequency, control the compressor 11 to increase the running frequency according to the relationship between the photovoltaic output voltage and the sum of 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 consumption power of the photovoltaic air conditioner 1.

[0051] In the embodiments, when the running frequency of the compressor 11 after the increase is less than the maximum running frequency f max , and the photovoltaic output voltage Upv does not exceed the sum of the maximum power voltage Um and the voltage offset ΔU, that is, Upv KT_max P PV_max , that is, P KT_max >P PV_max , and detects the running frequency of the compressor 11 after the increase, when the running frequency of the compressor 11 after the increase does not reach the maximum running frequency f max , and the photovoltaic output voltage Upv is not equal to the maximum power point voltage Um, that is, Upv max, or the photovoltaic output voltage is equal to the maximum power point voltage Um, i.e. Upv = Um, the maximum power point power P PV_max of the photovoltaic air conditioner 1 is greater than or equal to the maximum consumption power P KT_max of the photovoltaic air conditioner 1, i.e. 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 consumption power of the photovoltaic air conditioner 1, the controller 12 is further configured to: obtain a current operating frequency of the photovoltaic air conditioner 1, and control the photovoltaic air conditioner 1 to perform an action of increasing or decreasing the operating frequency of the compressor 11 according to the current operating frequency.

[0053] In embodiments, after the maximum power point power of the photovoltaic air conditioner 1 is greater than or equal to the maximum consumption power of the photovoltaic air conditioner 1, the current operating frequency of the photovoltaic air conditioner 1 is obtained, for example, denoted as f c , and the photovoltaic air conditioner 1 is controlled to perform an action of increasing or decreasing the operating frequency of the compressor 11 without exceeding the current operating frequency f c .

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

[0055] In embodiments, when the operating frequency of the compressor 11 reaches the maximum operating frequency f max , the controller 12 controls the photovoltaic air conditioner 1 to maintain operation at the maximum operating frequency f max , and the photovoltaic air conditioner 1 can perform an action of increasing or decreasing the operating frequency of the compressor 11 without exceeding the maximum operating frequency f max , as shown in FIG. 8A, at this time the photovoltaic air conditioner 1 works on the curve A→C. Figure 5

[0056] or when the operating frequency of the compressor 11 reaches the maximum operating frequency f max , the controller 12 controls the photovoltaic air conditioner 1 to maintain operation at the maximum operating frequency f max , and the photovoltaic air conditioner 1 can perform an action of increasing or decreasing the operating frequency of the compressor 11 without exceeding the maximum operating frequency f max , as shown in FIG. 8B, at this time the photovoltaic air conditioner 1 works on the curve D→F. Figure 6

[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: acquire the number of times the open-circuit voltage exceeds the maximum allowable input voltage of the photovoltaic air conditioner 1; when the number exceeds a preset threshold, output a prompt message that the photovoltaic air conditioner 1 has too high a voltage, and control the photovoltaic air conditioner 1 to stop working.

[0058] In this embodiment, the open-circuit voltage Uoc is compared with the maximum allowable input voltage U of the photovoltaic air conditioner 1. in_max The magnitude relationship is such that when the open-circuit voltage Uoc exceeds the maximum allowable input voltage U of photovoltaic air conditioner 1. in_max If the open-circuit voltage Uoc is considered too high and photovoltaic air conditioner 1 cannot be turned on, then the open-circuit voltage Uoc is obtained as exceeding the maximum allowable input voltage U of photovoltaic air conditioner 1. in_max The number of times is denoted as m. When the number of times m is greater than the preset number threshold, such as 3, i.e. m>3, it is considered that the voltage provided by the photovoltaic module exceeds the maximum safe voltage range allowed for input of the photovoltaic air conditioner 1, and the photovoltaic air conditioner 1 cannot work normally. In this case, a prompt message of excessive voltage of photovoltaic air conditioner 1 is output, and the photovoltaic air conditioner 1 is controlled to stop working. If the number of times m is less than or equal to the preset number threshold 3, i.e. m≤3, the open circuit voltage Uoc output by the photovoltaic array is obtained again after waiting for half an hour.

[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 low voltage warning message is output for the photovoltaic air conditioner 1.

[0060] In the embodiment, the maximum power point Um does not exceed the minimum allowable input voltage U. in_min And the open-circuit voltage U oc The minimum allowable input voltage U has not been exceeded. in_min That is, Um < U in_min And U oc <U in_min When the voltage of photovoltaic air conditioner 1 is too low, a prompt message will be output so that the user can understand the cause of the malfunction of photovoltaic air conditioner 1.

[0061] The following is combined with Figure 7 The control method of the photovoltaic air conditioner according to an embodiment of the present invention will be illustrated by example.

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

[0063] Step S11: When the photovoltaic module supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner is operating in a stable environment.

[0064] Step S12: Obtain the open-circuit voltage output by the photovoltaic array.

[0065] Step S13, determine whether the open circuit voltage exceeds the maximum allowed input voltage, if yes, execute step S14; otherwise, execute step S15.

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

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

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

[0069] Step S17, output a prompt information that the voltage of the photovoltaic air conditioner is too high, and control the photovoltaic air conditioner to stop working.

[0070] Step S18, determine whether the maximum power point voltage exceeds the minimum allowed input voltage, if yes, execute step S21; otherwise, execute step S19.

[0071] Step S19, determine whether the maximum power point voltage does not exceed the minimum allowed input voltage and the open circuit voltage exceeds the minimum allowed input voltage, if yes, execute step S21; otherwise, execute step S20.

[0072] Step S20, output a prompt information that the voltage of the photovoltaic air conditioner is too low.

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

[0074] Step S22, determine whether the operating frequency of the compressor does not reach the maximum operating frequency, if yes, execute step S24 and step S29; otherwise, execute step S23.

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

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

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

[0078] Step S26, determine whether the operating frequency of the compressor does not reach the maximum operating frequency and the photovoltaic output voltage is not equal to the maximum power point voltage, if yes, execute step S27; otherwise, execute step S24.

[0079] Step S27, control 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 consumption power of the photovoltaic air conditioner.

[0081] Step S29, determine whether the photovoltaic output voltage exceeds the minimum allowed input voltage, if yes, execute step S30; otherwise, execute step S21.

[0082] Step S30, control the boost circuit of the photovoltaic air conditioner to be turned on to control the compressor to increase the operating frequency according to the second preset frequency, and detect the operating frequency of the compressor after the operating frequency is increased.

[0083] Step S31, determine whether the operating frequency of the compressor after the operating frequency is increased reaches the maximum operating frequency, if yes, execute step S32; otherwise, execute step S23.

[0084] Step S32, determine whether the photovoltaic output voltage exceeds the sum of the maximum power voltage and the voltage offset, if yes, execute step S33; otherwise, execute step S30.

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

[0086] Step S34, determine whether the operating frequency of the compressor after the operating frequency is increased reaches the maximum operating frequency, if yes, execute step S35; otherwise, execute step S23.

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

[0088] Step S36, obtain the current operating frequency of the air conditioner, and control the photovoltaic air conditioner to perform the action of increasing or decreasing the operating frequency of the compressor according to the current operating frequency.

[0089] The photovoltaic air conditioner 1 according to the embodiment of the present application, by acquiring 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, starting the operation 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, controlling the compressor 11 to increase the operating frequency according to the first preset frequency, and simultaneously detecting the operating frequency of the compressor 11 in real time, adjusting the working state of the photovoltaic air conditioner 1 according to the photovoltaic output voltage when the operating frequency of the compressor does not reach the maximum operating frequency, i.e., increasing the frequency according to the second preset frequency which is relatively slow, preventing the photovoltaic air conditioner 1 from losing control of the working point and failing to work normally, and enabling the photovoltaic air conditioner 1 to operate stably within a certain power range.

[0090] The photovoltaic air conditioner 1 according to the embodiment of the present application, by acquiring 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, starting the operation 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, controlling the compressor 11 to increase the operating frequency according to the first preset frequency, and simultaneously detecting the operating frequency of the compressor 11 in real time, adjusting the working state of the photovoltaic air conditioner 1 according to the photovoltaic output voltage when the operating frequency of the compressor does not reach the maximum operating frequency, i.e., increasing the frequency according to the second preset frequency which is relatively slow, preventing the photovoltaic air conditioner 1 from losing control of the working point and failing to work normally, and enabling the photovoltaic air conditioner 1 to operate stably within a certain power range. Figure 8 The photovoltaic air conditioner 1 according to the embodiment of the present application, by acquiring 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, starting the operation 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, controlling the compressor 11 to increase the operating frequency according to the first preset frequency, and simultaneously detecting the operating frequency of the compressor 11 in real time, adjusting the working state of the photovoltaic air conditioner 1 according to the photovoltaic output voltage when the operating frequency of the compressor does not reach the maximum operating frequency, i.e., increasing the frequency according to the second preset frequency which is relatively slow, preventing the photovoltaic air conditioner 1 from losing control of the working point and failing to work normally, and enabling the photovoltaic air conditioner 1 to operate stably within a certain power range.

[0091] As shown in the control method of the photovoltaic air conditioner according to the embodiment of the present application, the control method comprises at least steps S1-S3. Figure 8

[0092] Step S1: When the photovoltaic module supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, the open circuit voltage output by the photovoltaic array is acquired.

[0093] In the embodiment, when the photovoltaic module supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates for the first time, the controller reads the current region and month, simultaneously acquires 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 change in the current month is stable according to the acquired current photovoltaic data, and if the weather change in the current month is unstable, the photovoltaic air conditioner is controlled to operate stably by using the adaptive maximum power point tracking control method; if the weather change in the current month is stable, it is considered that the photovoltaic air conditioner operates in a stable environment, and the open circuit voltage output by the photovoltaic array is acquired, for example, denoted as Uoc.

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

[0095] In the embodiment, after the open circuit voltage Uoc output by the photovoltaic array is acquired, the relationship between the open circuit voltage Uoc and the maximum allowable input voltage U in_max of the photovoltaic air conditioner is determined, and when the open circuit voltage Uoc does not exceed the maximum allowable input voltage U in_max of the photovoltaic air conditioner, i.e., U oc ≤ U in_max ​When it is considered that the voltage provided by the photovoltaic module is within the maximum safe voltage range allowed for input of 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, the maximum power point voltage of the photovoltaic array is recorded as Um, that is, Um=a%Uoc, for example, a=80, and it is noted that the calculated maximum power point voltage Um of the photovoltaic array is greater than the maximum power point voltage U m_ideal , of the actual photovoltaic curve, so that the photovoltaic air conditioner operates in the right stable working area of the photovoltaic volt-ampere characteristic curve, avoids the loss of control of the photovoltaic working point when operating in the unstable area, and causes the photovoltaic air conditioner or other electrical appliances to work abnormally, and the photovoltaic output voltage is obtained in real time, for example, recorded as Upv.

[0096] In step S3, when the maximum power point voltage exceeds the minimum allowed input voltage, or the maximum power point voltage does not exceed the minimum allowed input voltage and the open circuit voltage exceeds the minimum allowed input voltage, the operating frequency of the compressor is increased according to the first preset frequency, and when the operating frequency of the compressor does not reach the maximum operating frequency, the operating frequency of the compressor is increased 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 consumption power of the photovoltaic air conditioner, and the second preset frequency is less than the first preset frequency.

[0097] In the embodiment, when the maximum power point voltage Um exceeds the minimum allowed input voltage U in_min , that is, Um>U in_min , the photovoltaic air conditioner starts to work from point A, the operating frequency of the compressor is increased according to the first preset frequency, and the operating frequency of the compressor is detected in real time to determine the size relationship between the operating frequency of the compressor and the maximum operating frequency f max , for example, recorded as f max , when the operating frequency of the compressor does not reach the maximum operating frequency f PV_max , the operating frequency of the compressor is increased according to the second preset frequency, that is, at a relatively slow speed, to adjust the working state of the photovoltaic air conditioner, until the maximum power point power P KT_max of the photovoltaic air conditioner is greater than or equal to the maximum consumption power P PV_max of the photovoltaic air conditioner, that is, P KT_max >P PV_max .

[0098] Or when the maximum power point voltage Um does not exceed the minimum allowed input voltage U in_min and the open circuit voltage U oc exceeds the minimum allowed input voltage U in_min , that is, Um in_min and U oc ≥U in_minWhen the open circuit voltage is less than the maximum allowable input voltage of the photovoltaic air conditioner, the photovoltaic air conditioner starts to work from the point D, and the compressor is controlled to increase the operating frequency according to the first preset frequency. At the same time, the operating frequency of the compressor is detected in real time, and the size relationship between the operating frequency of the compressor and the maximum operating frequency, for example, f max , is judged. When the operating frequency of the compressor does not reach the maximum operating frequency f max , the operating frequency of the compressor is increased according to the second preset frequency, that is, at a relatively slow speed, according to the photovoltaic output voltage, so as to adjust the working state of the photovoltaic air conditioner, until the maximum power point power P PV_max of the photovoltaic air conditioner is greater than or equal to the maximum consumption power P KT_max of the photovoltaic air conditioner, 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 is stably operated within a certain power range, and the risk of out-of-control working point and the photovoltaic air conditioner unable to work normally is prevented.

[0099] According to the control method of the photovoltaic air conditioner, when the open circuit voltage is less than the maximum allowable input voltage of the photovoltaic air conditioner, the maximum power point voltage of the photovoltaic array and the photovoltaic output voltage are obtained. 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 photovoltaic air conditioner starts to work, the operating frequency of the compressor is controlled to increase according to the first preset frequency, and the operating frequency of the compressor is detected 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 relatively slow second preset frequency, so as to prevent the risk of out-of-control working point and the photovoltaic air conditioner unable to work normally, and to stably operate the photovoltaic air conditioner within a certain power range.

[0100] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example.

[0101] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A photovoltaic air conditioner, characterized by, Compressor for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging it to a condenser; The controller is configured to: when the photovoltaic module supplies power to the photovoltaic air conditioner and the photovoltaic air conditioner operates in a stable environment, acquire 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, acquire a maximum power point voltage and a photovoltaic output voltage of the photovoltaic array; 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, 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 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 consumption power of the photovoltaic air conditioner, wherein the second preset frequency is less than the first preset frequency. When the photovoltaic output voltage controls the compressor to increase the operating frequency according to the second preset frequency until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum consumption power of the photovoltaic air conditioner, the controller is configured to:

2. The photovoltaic air conditioner of claim 1, wherein, When the photovoltaic output voltage exceeds the sum of the maximum power point voltage and a 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 based on 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 consumption power of the photovoltaic air conditioner. When the photovoltaic output voltage and the maximum power point voltage control the compressor to increase the operating frequency, the controller is configured to:

3. The photovoltaic air conditioner of claim 2, wherein, During the process in which the compressor increases the operating frequency according to the second preset frequency, if the operating frequency of the compressor does not reach the maximum operating frequency and the photovoltaic output voltage is not equal to the maximum power point voltage, control 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. When the photovoltaic output voltage controls the compressor to increase the operating frequency according to the second preset frequency until the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum consumption power of the photovoltaic air conditioner, the controller is configured to:

4. The photovoltaic air conditioner of claim 1, wherein, When the photovoltaic output voltage does not exceed the minimum allowable input voltage, control the boost circuit of the photovoltaic air conditioner to be turned on, to control the compressor to increase the 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 raised does not reach the maximum operating frequency, the operating frequency of the compressor is raised 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 consumption power of the photovoltaic air conditioner.

5. The photovoltaic air conditioner of claim 4, wherein, when the operating frequency of the compressor after the operating frequency is raised does not reach the maximum operating frequency, the operating frequency of the compressor is raised 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 consumption power of the photovoltaic air conditioner. when the operating frequency of the compressor after the operating frequency is raised does not reach the maximum operating frequency, the operating frequency of the compressor is raised 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 consumption power of the photovoltaic air conditioner. when the operating frequency of the compressor after the operating frequency is raised does not reach the maximum operating frequency, the operating frequency of the compressor is raised 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 consumption power of the photovoltaic air conditioner.

6. The photovoltaic air conditioner of claim 1, wherein, after the maximum power point power of the photovoltaic air conditioner is greater than or equal to the maximum consumption power 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 perform the action of raising or lowering the operating frequency of the compressor according to the current operating frequency.

7. The photovoltaic air conditioner of claim 1, wherein, 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 perform the action of raising or lowering the operating frequency of the compressor according to the maximum operating frequency.

8. The photovoltaic air conditioner of claim 1, wherein, 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 that 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, output prompt information that the voltage of the photovoltaic air conditioner is too high, and control the photovoltaic air conditioner to stop working.

9. The photovoltaic air conditioner of claim 1, wherein, when the maximum power point voltage does not exceed the minimum allowable input voltage and the open circuit voltage does not exceed the minimum allowable input voltage, output prompt information that the voltage of the photovoltaic air conditioner is too low.

10. A control method of a photovoltaic air conditioner, characterized by, comprising: when the photovoltaic assembly 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 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, the compressor is controlled to increase the operating frequency at 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 at 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 consumption power of the photovoltaic air conditioner, wherein the second preset frequency is less than the first preset frequency.

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