CN118044088A

CN118044088A - Photovoltaic air conditioner, control method thereof and photovoltaic air conditioning system

Info

Publication number: CN118044088A
Application number: CN202280063781.1A
Authority: CN
Inventors: 刘洋; 何成军; 单烁
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2022-01-27
Filing date: 2022-03-30
Publication date: 2024-05-14
Also published as: CN114256879A; WO2023142261A1

Abstract

The disclosure provides a photovoltaic air conditioner, a control method thereof and a photovoltaic air conditioning system. The photovoltaic air conditioner comprises a first compressor, a first inverter, a first switch circuit and a main control board. The main control board is configured to control the first inverter device to convert direct current from the photovoltaic module into alternating current when the photovoltaic power generation is met and the photovoltaic air conditioner is in an air supply or standby state, and control the first switch circuit to conduct the first inverter device with the power grid so as to output the converted alternating current to the power grid; and when the photovoltaic power generation is satisfied and the photovoltaic air conditioner is in a refrigerating state or a heating state, controlling the first inverter device to convert direct current from the photovoltaic module into alternating current, and controlling the first switch circuit to conduct the first inverter device and the first compressor so as to output the converted alternating current to the first compressor.

Description

Photovoltaic air conditioner, control method thereof and photovoltaic air conditioning system

The present disclosure claims priority from chinese patent application number 202210103307.9 filed on 27, 2022, 01, which is incorporated herein by reference in its entirety.

Technical Field

The disclosure relates to the technical field of air conditioning, in particular to a photovoltaic air conditioner, a control method thereof and a photovoltaic air conditioning system.

Background

The air conditioner is a heat exchange device and comprises an air conditioner indoor unit, wherein the air conditioner indoor unit is arranged indoors, and heat or cold generated by heating or refrigerating of an air conditioner internal system is sent into the room through a fan, so that the aim of adjusting the indoor temperature is fulfilled.

However, the air conditioner consumes a large amount of electric power during operation. In order to reduce the reliance on non-renewable energy sources, photovoltaic air conditioning systems have emerged that convert solar energy into electrical energy through photovoltaic modules and provide the electrical energy to an air conditioner. However, when the photovoltaic module generates a large amount of electric power under a sunny condition, the surplus electric power may be wasted.

Disclosure of Invention

Some embodiments of the present disclosure employ the following technical solutions:

In one aspect, the disclosure provides a photovoltaic air conditioner, including a first compressor, a first inverter, a first switch circuit and a main control board. The first inverter device is configured to convert direct current from the photovoltaic module into alternating current. The first switching circuit is coupled with the first inverter device and the first compressor; the first switching circuit is configured to conduct the first inverter device with a power grid or with the first compressor.

The main control board is coupled with the first switch circuit and the first inverter. The main control board is configured to control the first inverter device to convert direct current from the photovoltaic module into alternating current and control the first switch circuit to conduct the first inverter device and the power grid under the condition that photovoltaic power generation is met and the photovoltaic air conditioner is in an air supply state or a standby state, so that the alternating current converted by the first inverter device is output to the power grid; under the condition that photovoltaic power generation is met and the photovoltaic air conditioner is in a refrigerating state or a heating state, the first inverter device is controlled to convert direct current from the photovoltaic module into alternating current, and the first switch circuit is controlled to conduct the first inverter device and the first compressor so that the alternating current converted by the first inverter device is output to the first compressor.

On the other hand, the disclosure also provides a control method of the photovoltaic air conditioner, which is used for controlling the photovoltaic air conditioner and comprises the following steps: and under the condition that the photovoltaic air conditioner meets photovoltaic power generation, determining the working state of the photovoltaic air conditioner according to the instruction information. The working state at least comprises an air supply state, a standby state, a refrigerating state and a heating state. When the photovoltaic air conditioner is in an air supply state or a standby state, the first inverter device is controlled to convert direct current from the photovoltaic module into alternating current, and the first switch circuit is controlled to conduct the first inverter device with the power grid so that the alternating current converted by the first inverter device is output to the power grid. When the photovoltaic air conditioner is in a refrigerating state or a heating state, the first inverter device is controlled to convert direct current from the photovoltaic module into alternating current, and the first switch circuit is controlled to conduct the first inverter device and the first compressor so that the alternating current converted by the first inverter device is output to the first compressor.

In yet another aspect, the disclosure further provides a photovoltaic air conditioning system, including the above photovoltaic air conditioner and photovoltaic module. The photovoltaic module is coupled with the photovoltaic air conditioner, and is used for converting solar energy into electric energy and transmitting the electric energy to the photovoltaic air conditioner.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings that are required to be used in some embodiments of the present disclosure will be briefly described below, however, the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained according to these drawings for those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the products, the actual flow of the methods, the actual timing of the signals, etc. according to the embodiments of the present disclosure.

FIG. 1 is a block diagram of a photovoltaic air conditioning system according to some embodiments;

FIG. 2 is a circuit diagram of the photovoltaic air conditioning system shown in FIG. 1;

FIG. 3 is a block diagram of another photovoltaic air conditioning system according to some embodiments;

FIG. 4 is a circuit diagram of the photovoltaic air conditioning system shown in FIG. 3;

FIG. 5 is a block diagram of yet another photovoltaic air conditioning system according to some embodiments;

FIG. 6 is a circuit diagram of the photovoltaic air conditioning system shown in FIG. 5;

FIG. 7 is a flow chart of a method of controlling a photovoltaic air conditioner according to some embodiments;

Fig. 8 is a flow chart of another method of controlling a photovoltaic air conditioner according to some embodiments.

Detailed Description

The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments (some embodiments)", "exemplary embodiment (exemplary embodiments)", "example (example)", "specific example (some examples)", etc. are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present disclosure, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present disclosure.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present disclosure, the expressions "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled (communicatively coupled)" may also mean that two or more elements are not in direct contact with each other, but yet still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the disclosure herein.

At least one of "A, B and C" has the same meaning as at least one of "A, B or C" and includes the following combinations of A, B and C: a alone, B alone, C alone, a combination of a and B, a combination of a and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

As used herein, the term "if" is optionally interpreted to mean "when … …" or "at … …" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if determined … …" or "if a [ stated condition or event ] is detected" is optionally interpreted to mean "upon determination … …" or "in response to determination … …" or "upon detection of a [ stated condition or event ]" or "in response to detection of a [ stated condition or event ], depending on the context.

The use of "for" or "configured to" herein is meant to be open and inclusive language that does not exclude apparatuses for or configured to perform additional tasks or steps.

The present disclosure provides a photovoltaic air conditioner 100, referring to fig. 1, the photovoltaic air conditioner 100 includes a first compressor 10, a first inverter 20, a first switching circuit 30, and a main control board 40.

With continued reference to fig. 1, the first inverter device 20 is configured to convert dc power from the photovoltaic module 200 into ac power. The first switching circuit 30 is coupled with the first inverter device 20 and the first compressor 10, and the first switching circuit 30 is configured to conduct the first inverter device 20 with the power grid 300 or the first compressor 10.

The main control board 40 is coupled to the first switching circuit 30 and the first inverter 20. The main control board 40 is configured to control the first inverter device 20 to convert direct current from the photovoltaic module 200 into alternating current and control the first switching circuit 30 to conduct the first inverter device 20 with the power grid 300 so that the alternating current converted by the first inverter device 20 is output to the power grid 300 when the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in an air supply state or a standby state; when the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in a cooling state or a heating state, the first inverter 20 is controlled to convert the direct current from the photovoltaic module 200 into the alternating current, and the first switching circuit 30 is controlled to turn on the first inverter 20 and the first compressor 10 so that the alternating current converted by the first inverter 20 is output to the first compressor 10.

It should be noted that the cooling state or the heating state herein does not merely represent a cooling or heating mode of the photovoltaic air conditioner 100, but includes other modes requiring the compressor to operate, such as a defrosting mode or a dehumidifying mode.

As can be seen from the above, in the photovoltaic air conditioner 100 according to some embodiments of the present disclosure, when the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in the air supply state or the standby state, the direct current output by the photovoltaic module 200 can be converted into the alternating current and input into the power grid 300, so as to improve the energy utilization rate and obtain the benefit; in the case that the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in a cooling state or a heating state, the direct current outputted by the photovoltaic module 200 can be converted into alternating current and inputted into the first compressor 10 to drive the first compressor 10, thereby realizing cooling or heating and reducing the operation cost. In the photovoltaic air conditioner 100 of some embodiments of the present disclosure, when solar energy is converted into electric energy by the photovoltaic module 200 and provided for the photovoltaic air conditioner 100, the electric energy converted by the photovoltaic module 200 can be input into a power grid when the photovoltaic air conditioner 100 is in standby or sending air, so as to improve the energy utilization rate and obtain benefits.

The photovoltaic air conditioner 100 further includes an instruction input device 60, where the instruction input device 60 is coupled to the main control board 40, and the instruction input device 60 is configured to receive a user operation instruction and output instruction information.

Here, the operation instruction includes at least one of a blowing state, a standby state, a cooling state, a heating state, and a set temperature, and the instruction information includes instruction information for controlling the start, stop, and running frequency of the first compressor 10 and/or the second compressor 11 (see fig. 3). That is, the main control board 40 can determine the state of the operation required for the photovoltaic air conditioner 100 and the operation frequency of the compressor according to the instruction information outputted from the instruction input device 60.

It should be noted that the instruction input device 60 may be one or more of touch-sensitive input, sound input, vibration input, and text code graphic input.

It should be appreciated that the power grid 300 may be any of single-phase power, two-phase power, or three-phase power in different application scenarios. Here, the inverter and the compressor may be adaptively adjusted according to the actual situation of the power grid 300.

For convenience of explanation, the following embodiments will be exemplarily explained by taking three-phase power as an example. In the three-phase power, referring to fig. 1 and 2, a first phase is an R phase, a second phase is an S phase, and a third phase is a T phase. Fig. 2 is a circuit diagram of the photovoltaic air conditioning system shown in fig. 1, and the command input device 60 is not shown in fig. 2.

As shown in fig. 1 and 2, the first compressor 10 may be a permanent magnet synchronous motor, and three stators of the permanent magnet synchronous motor are respectively connected with an R phase, an S phase and a T phase in the three-phase power in a one-to-one correspondence manner.

As shown in fig. 1 and 2, the first inverter device 20 includes a first drive board 22 and a three-phase bridge circuit 23. The first driving board 22 is configured to receive instruction information of the main control board 40, and to control on or off of the three-phase bridge circuit 23 according to the instruction information. The three-phase bridge circuit 23 includes a first phase leg, a second phase leg, and a third phase leg connected in parallel.

Referring to fig. 2, the first phase leg includes a first upper leg formed by a first power transistor Q1 and an antiparallel first diode D1, and a second upper leg formed by a second power transistor Q2 and an antiparallel second diode D2. The control terminal of the first power transistor Q1 and the control terminal of the second power transistor Q2 are coupled to the first driving board 22.

Referring to fig. 2, the second phase leg includes a second upper leg formed by a third power transistor Q3 and an antiparallel third diode D3, and a second lower leg formed by a fourth power transistor Q4 and an antiparallel fourth diode D4. The control terminal of the third power transistor Q3 and the control terminal of the fourth power transistor Q4 are coupled to the first driving board 22.

Referring to fig. 2, the third phase leg includes a third upper leg formed by a fifth power transistor Q5 and an antiparallel fifth diode D5, and a third lower leg formed by a sixth power transistor Q6 and an antiparallel sixth diode D6. The control terminal of the fifth power transistor Q5 and the control terminal of the sixth power transistor Q6 are coupled to the first driving board 22.

On the basis, the R phase of the three-phase power supply can be connected to the connection part U of the first upper arm and the first lower arm, the S phase of the three-phase power supply can be connected to the connection part V of the second upper arm and the second lower arm, and the T phase of the three-phase power supply can be connected to the connection part W of the third upper arm and the third lower arm.

As shown in fig. 2, the first switch circuit 30 may be a relay. The first switching circuit 30 is illustratively a switching type relay coupled to the main control board 40 (not shown in fig. 2). The conversion relay comprises a movable contact 1, a first fixed contact 2 and a second fixed contact 3, wherein the movable contact 1 is coupled with the first inverter device 20, the first fixed contact 2 is coupled with the first compressor 10, and the second fixed contact 3 is coupled with the power grid 300. When the coil is not energized, the movable contact 1 and one of the stationary contacts are opened and the other is closed, for example, the movable contact 1 and the first stationary contact 2 are opened and the second stationary contact 3 is closed; when the coil is energized, the movable contact 1 is opened from the original stationary contact, and the other stationary contact is closed, for example, the movable contact 1 is opened from the second stationary contact 3 and the first stationary contact 2 is closed, so that the purpose of line switching is achieved, i.e., the first inverter 20 is conducted with the power grid 300 or the first compressor 10 is conducted.

In some embodiments, as shown in fig. 3 and 4, the first inverter device 20 is further configured to convert alternating current from the power grid 300 to direct current.

On this basis, as shown in fig. 3, the photovoltaic air conditioner 100 further includes at least one second compressor 11 and at least one second inverter device 21, and each second inverter device 21 is coupled to one second compressor 11 and the main control board 40. For convenience of explanation, the photovoltaic air conditioner 100 including one second compressor 11 is exemplified in the following embodiments.

Referring to fig. 4, the second inverter 21 converts direct current from the photovoltaic module 200 or the first inverter 20 into alternating current and transmits the alternating current to the second compressor 11. Here, the second inverter device 21 includes a second driving board 24 and a three-phase bridge circuit 23 coupled to the second driving board 24, and the structures of the second driving board 24 and the three-phase bridge circuit 23 may refer to the first inverter device 20, which is not described herein.

The main control board 40 is further used for controlling the first switch circuit 30 to conduct the first inverter device 20 with the power grid 300, controlling the first inverter device 20 to convert the alternating current from the power grid 300 into direct current, controlling the second inverter device 21 to convert the direct current converted from the first inverter device 20 into alternating current, and transmitting the alternating current to the second compressor 11 under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in a cooling state or a heating state.

That is, in the case that solar energy cannot be converted into electric energy through the photovoltaic module 200 and provided to the photovoltaic air conditioner 100 for use, for example, at night or in cloudy days, the photovoltaic air conditioner 100 may also be connected to the power grid 300, and the power grid 300 provides electric energy to drive the second compressor 11, thereby realizing cooling or heating to ensure normal use of the photovoltaic air conditioner 100.

In addition, in case that the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in a cooling state or a heating state, the main control board 40 may drive the first compressor 10 and/or the second compressor 11 according to the need.

For example, referring to fig. 3 and 4, the main control board 40 is further configured to control the first inverter device 20 to convert the direct current from the photovoltaic module 200 into the alternating current and control the first switching circuit 30 to conduct the first inverter device 20 with the power grid 300 so that the alternating current converted by the first inverter device 20 is output to the power grid 300 when the first compressor 10 does not need to operate in a case that the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in a cooling state or a heating state; and controlling the second inverter device 21 to convert the direct current from the photovoltaic module 200 into alternating current and to transmit the alternating current to the second compressor 11.

That is, when the photovoltaic air conditioner 100 drives one compressor to meet the requirement and the electric energy converted by the photovoltaic module 200 is greater than the electric energy required for driving one compressor, the photovoltaic air conditioner 100 can utilize the electric energy of the photovoltaic module 200 to realize the cooling or heating function and simultaneously input the redundant electric energy into the power grid 300 to obtain the benefits.

It should be noted that, in the case where the photovoltaic air conditioner 100 can drive one compressor to meet the requirement, the main control board 40 may drive only the first compressor 10. Illustratively, the first inverter device 20 is controlled to convert direct current from the photovoltaic module 200 into alternating current, and the first switching circuit 30 is controlled to conduct the first inverter device 20 with the first compressor 10 so that the alternating current converted by the first inverter device 20 is output to the first compressor 10; and, controlling the second inverter device 21 to be turned off to disconnect the photovoltaic module 200 from the second compressor 11.

For example, referring to fig. 3 and 4, the main control board 40 is further configured to, when the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in a cooling state or a heating state, control the first inverter device 20 to convert the direct current from the photovoltaic module 200 into the alternating current and control the first switch circuit 30 to conduct the first inverter device 20 with the first compressor 10 so that the alternating current converted by the first inverter device 20 is output to the first compressor 10 when both the first compressor 10 and the second compressor 11 need to operate; and controlling the second inverter device 21 to convert the direct current from the photovoltaic module 200 into alternating current and to transmit the alternating current to the second compressor 11. In this case, the photovoltaic air conditioner 100 has high cooling efficiency, and does not require the power grid 300 to supply power, thereby saving cost.

It should be noted that, when the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in the air supply state or the standby state, the main control board 40 also controls the second inverter 21 to be turned off, that is, the three-phase bridge circuit 23 in the second inverter 21 is turned off, so that the photovoltaic module 200 is turned off from the second compressor 11, and the second compressor 11 is prevented from being started; and controlling the first switching circuit 30 to conduct the first inverter device 20 with the power grid 300, so that the maximum amount of electric energy converted by the photovoltaic module 200 is input into the power grid 300, and the benefit is obtained.

In some embodiments, as shown in fig. 5, the photovoltaic air conditioner 100 further includes at least one rectifier 50, and the rectifier 50 is coupled to the first inverter 20, the second inverter 21, and the main control board 40. For convenience of explanation, the following embodiments will be exemplified by taking the photovoltaic air conditioner 100 including one rectifier 50 as an example.

Referring to fig. 5 and 6, the first inverter device 20 is further configured to convert the direct current from the rectifier 50 into alternating current and transmit the alternating current to the first compressor 10. The second inverter device 21 is also configured to convert the direct current from the rectifier 50 into alternating current and transmit the alternating current to the second compressor 11. The rectifier 50 is configured to convert the alternating current of the power grid 300 into direct current and transmit to the first inverter device 20 and/or the second inverter device 21.

In some embodiments, as shown in fig. 6, rectifier 50 includes three rectifying circuits in parallel, each rectifying circuit including two diodes in series. On the basis, the first phase, the second phase and the third phase of the three-phase power correspond to one rectifying circuit respectively and are connected between two diodes of the rectifying circuit.

It should be noted that the rectifier 50 may further include a capacitor to ensure that the output voltage is substantially constant.

In this case, the main control board 40 may drive the first compressor 10 and/or the second compressor 11 according to the need under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in a cooling state or a heating state.

For example, referring to fig. 5 and 6, the main control board 40 is further configured to control the second inverter device 21 to convert the direct current converted from the first inverter device 20 and/or the direct current from the rectifier 50 into the alternating current and transmit the alternating current to the second compressor 11 when the first compressor 10 does not need to operate under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in a cooling or heating state.

For example, referring to fig. 5 and 6, the main control board 40 is further configured to control the first switch circuit 30 to conduct the first inverter device 20 with the first compressor 10 when the second compressor 11 is not required to operate under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in a cooling or heating state, so that the alternating current converted by the first inverter device 20 is output to the first compressor 10; and controlling the second inverter device 21 to be disconnected so that the power grid 300 is disconnected from the second compressor 21.

That is, in the case that solar energy cannot be converted into electric energy through the photovoltaic module 200 and the photovoltaic air conditioner 100 is used, the photovoltaic air conditioner 100 can be connected to the power grid 300, and the power grid 300 provides electric energy to drive the first compressor 10 or the second compressor 11, so that refrigeration or heating is realized, and normal use of the photovoltaic air conditioner 100 is ensured.

For example, referring to fig. 5 and 6, the main control board 100 is further configured to control the first switching circuit 30 to conduct the first inverter device 20 with the first compressor 10, control the first inverter device 20 to convert the direct current from the rectifier 50 into the alternating current and transmit the alternating current to the first compressor 10 when both the first compressor 10 and the second compressor 11 need to operate under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in a cooling or heating state; and controlling the second inverter device 21 to convert the direct current from the rectifier 50 into alternating current and to transmit the alternating current to the second compressor 11.

That is, in the case that solar energy cannot be converted into electric energy through the photovoltaic module 200 and is provided to the photovoltaic air conditioner 100 for use, the photovoltaic air conditioner 100 may also be connected to the power grid 300, and the power grid 300 provides electric energy to drive the first compressor 10 and the second compressor 11, thereby achieving efficient cooling or heating.

On the other hand, the embodiment of the disclosure further provides a control method of the photovoltaic air conditioner 100, referring to fig. 7, the control method includes S100 to S400.

S100: referring to fig. 2, it is determined whether the photovoltaic air conditioner 100 satisfies photovoltaic power generation.

Here, whether the photovoltaic air conditioner 100 satisfies the photovoltaic power generation is determined by comparing the actual power of the photovoltaic module 200 with the maximum power of the photovoltaic air conditioner 100. In the case that the actual power of the photovoltaic module 200 is greater than or equal to the maximum power of the photovoltaic air conditioner 100, it is determined that the photovoltaic air conditioner 100 satisfies photovoltaic power generation; in the case where the actual power of the photovoltaic module 200 is smaller than the maximum power of the photovoltaic air conditioner 100, it is determined that the photovoltaic air conditioner 100 does not satisfy the photovoltaic power generation.

Before determining whether the photovoltaic air conditioner 100 satisfies the photovoltaic power generation, the photovoltaic air conditioner 100 needs to perform self-inspection or the like, which is not limited in this disclosure.

S200: the operating state of the photovoltaic air conditioner 100 is determined.

In the above steps, the working state of the photovoltaic air conditioner 100 may be determined according to the instruction information. The instruction information is outputted by the instruction input device according to the user operation instruction. The operation instruction includes at least one of a blowing state, a standby state, a cooling state, a heating state, and a set temperature, and the instruction information includes instruction information for controlling the start, stop, and operation frequency of the first compressor 10 and/or the second compressor 11.

For example, in case the photovoltaic air conditioner 100 satisfies the photovoltaic power generation, the user inputs an air supply state or a standby state, the main control board 40 receives instruction information for controlling the first compressor 10 to stop, and performs S300; for another example, in case that the photovoltaic air conditioner 100 satisfies the photovoltaic power generation, the user inputs a cooling state or a heating state, the main control board 40 receives instruction information for controlling the start of the first compressor 10, and performs S400.

S300: the first inverter 20 is controlled to convert direct current from the photovoltaic module 200 into alternating current, and the first switching circuit 30 is controlled to conduct the first inverter 20 with the power grid 300.

At this time, as shown in fig. 1 and 2, the alternating current converted by the first inverter device 20 may be output to the power grid 300, that is, the electric energy converted by the photovoltaic module 200 may be input to the power grid 300, so as to improve the energy utilization rate and obtain benefits.

S400: the first inverter 20 is controlled to convert direct current from the photovoltaic module 200 into alternating current, and the first switching circuit 30 is controlled to turn on the first inverter 20 and the first compressor 10.

At this time, as shown in fig. 1 and 2, the alternating current converted by the first inverter device 20 may be output to the first compressor 10, that is, the electric energy converted by the photovoltaic module 200 may drive the first compressor 10, thereby achieving cooling or heating and reducing the operation cost.

Referring to fig. 3 and 4, in the case where the photovoltaic air conditioner 100 further includes at least one second compressor 11 and at least one second inverter 21, referring to fig. 7, the above-mentioned control method further includes S500.

In case that the photovoltaic air conditioner 100 does not satisfy the photovoltaic power generation and the user inputs the cooling state or the heating state, S500 may be performed.

S500: the first switching circuit 30 is controlled to turn on the first inverter device 20 and the power grid 300, to control the first inverter device 20 to convert the alternating current from the power grid 300 into direct current, to control the second inverter device 21 to convert the direct current converted from the first inverter device 20 into alternating current, and to transmit the alternating current to the second compressor 11.

At this time, referring to fig. 3 and 4, in the case that solar energy cannot be converted into electric energy by the photovoltaic module 200 and provided to the photovoltaic air conditioner 100 for use, for example, at night or in cloudy days, the photovoltaic air conditioner 100 may also be connected to the power grid 300, and the power grid 300 provides electric energy to drive the second compressor 11, so as to realize refrigeration or heating, and ensure normal use of the photovoltaic air conditioner 100.

On the basis of this, in determining the operating state of the photovoltaic air conditioner 100 according to the instruction information, it is also necessary to determine whether the first compressor 10 and the second compressor 11 need to operate. At this time, as shown in fig. 8, the control method may further include S600 to S800.

In the case where the photovoltaic air conditioner 100 satisfies the photovoltaic power generation, and when the photovoltaic air conditioner 100 is in the cooling state or the heating state, S600 may be performed before S400 is performed.

S600: it is determined whether the first compressor 10 and the second compressor 11 need to operate.

Wherein S700 is performed when the first compressor 10 does not need to operate. When the first compressor 10 needs to be operated and the second compressor 11 does not need to be operated, the above-mentioned S400 is performed again, and the second inverter device 21 is controlled to be turned off, so that the photovoltaic module 200 is turned off from the second compressor 11. When both the first compressor 10 and the second compressor 11 need to operate, S800 is performed.

S700: the first inverter device 20 is controlled to convert direct current from the photovoltaic module 200 into alternating current, and the first switch circuit 30 is controlled to conduct the first inverter device 20 with the power grid 300; the second inverter device 21 is controlled to convert the direct current from the photovoltaic module 200 into alternating current and transmit the alternating current to the second compressor 11.

At this time, the photovoltaic air conditioner 100 may input the surplus electric energy into the power grid 300 to obtain the benefit while realizing the cooling or heating function by using the electric energy of the photovoltaic module 200.

S800: the first inverter 20 is controlled to convert direct current from the photovoltaic module 200 into alternating current, and the first switching circuit 30 is controlled to conduct the first inverter 20 with the first compressor 10; the second inverter device 21 is controlled to convert the direct current from the photovoltaic module 200 into alternating current and transmit the alternating current to the second compressor 11.

At this time, the photovoltaic air conditioner 100 has higher refrigeration efficiency, and does not need the power grid 300 to provide electric energy, thereby saving cost.

As shown in fig. 5 and 6, in the case where the photovoltaic air conditioner 100 further includes at least one rectifier 50, referring to fig. 8, the above-described control method may further include S900.

In the condition that the photovoltaic air conditioner 100 does not satisfy the photovoltaic power generation and the photovoltaic air conditioner 100 is in the cooling or heating state, S600 may be performed before S500 is performed. At this time, when both the first compressor 10 and the second compressor 11 need to operate, S900 is performed; when only one compressor start is required, the second compressor 11 may be selectively started, i.e., S500 is performed. In performing S500, the second inverter 21 may convert and transmit the direct current converted from the first inverter 20 to the second compressor 11, or may convert and transmit the direct current from the rectifier 50 to the second compressor 11.

S900: the first switching circuit 30 is controlled to turn on the first inverter 20 and the first compressor 10, and the first inverter 20 is controlled to convert the direct current from the rectifier 50 into alternating current and transmit the alternating current to the first compressor 10; and controlling the second inverter device 21 to convert the direct current from the rectifier 50 into alternating current and to transmit the alternating current to the second compressor 11.

At this time, in the case that solar energy cannot be converted into electric energy through the photovoltaic module 200 and is provided for the photovoltaic air conditioner 100, the photovoltaic air conditioner 100 may also be connected to the power grid 300, and the power grid 300 provides electric energy to drive the first compressor 10 and the second compressor 11, thereby realizing efficient cooling or heating.

In yet another aspect, the disclosed embodiment further provides a photovoltaic air conditioning system 1000, referring to fig. 1, the photovoltaic air conditioning system 1000 includes the photovoltaic air conditioner 100 and the photovoltaic module 200 according to any of the above embodiments. The photovoltaic module 200 is coupled to the photovoltaic air conditioner 100, and the photovoltaic module 200 is used for converting solar energy into electric energy and transmitting the electric energy to the photovoltaic air conditioner 100.

The above is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the disclosure are intended to be covered in the protection scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

A photovoltaic air conditioner comprising:

a first compressor;

a first inverter configured to convert direct current from the photovoltaic module into alternating current;

A first switching circuit coupled with the first inverter and the first compressor; the first switching circuit is configured to conduct the first inverter device with a power grid or the first compressor;

The main control board is coupled with the first switch circuit and the first inverter; the main control board is configured to be used for controlling the operation of the device,

Under the condition that photovoltaic power generation is met, and the photovoltaic air conditioner is in an air supply state or a standby state, controlling the first inverter device to convert direct current from the photovoltaic module into alternating current, and controlling the first switch circuit to conduct the first inverter device and the power grid so as to enable the alternating current converted by the first inverter device to be output to the power grid;

Under the condition that photovoltaic power generation is met and the photovoltaic air conditioner is in a refrigerating state or a heating state, the first inverter device is controlled to convert direct current from the photovoltaic module into alternating current, and the first switch circuit is controlled to conduct the first inverter device and the first compressor so that the alternating current converted by the first inverter device is output to the first compressor.
The photovoltaic air conditioner of claim 1, the first inverter further configured to convert alternating current from the power grid to direct current; the photovoltaic air conditioner further comprises:

At least one second compressor;

At least one second inverter device, each second inverter device coupled to one second compressor; the second inverter device is configured to convert direct current from the photovoltaic module or the first inverter device into alternating current and transmit the alternating current to the second compressor;

the main control board is also coupled with the second inversion device; the main control board is further configured to,

Under the condition that photovoltaic power generation is not met and the photovoltaic air conditioner is in a refrigerating state or a heating state, the first switching circuit is controlled to conduct the first inverter device with the power grid, the first inverter device is controlled to convert alternating current from the power grid into direct current, the second inverter device is controlled to convert the direct current converted from the first inverter device into alternating current, and the alternating current is transmitted to the second compressor.
The photovoltaic air conditioner of claim 2, the main control panel further configured to, if photovoltaic power generation is satisfied and the photovoltaic air conditioner is in a cooling state or a heating state;

When the first compressor does not need to work, the first inverter device is controlled to convert direct current from the photovoltaic module into alternating current, and the first switch circuit is controlled to conduct the first inverter device and the power grid so that the alternating current converted by the first inverter device is output to the power grid; and controlling the second inverter to convert the direct current from the photovoltaic module into alternating current and transmitting the alternating current to the second compressor.
The photovoltaic air conditioner of claim 3, the main control panel further configured to, if photovoltaic power generation is satisfied and the photovoltaic air conditioner is in a cooling state or a heating state;

When the first compressor and the second compressor are required to work, the first inverter device is controlled to convert direct current from the photovoltaic assembly into alternating current, and the first switch circuit is controlled to conduct the first inverter device and the first compressor so that the alternating current converted by the first inverter device is output to the first compressor; and controlling the second inverter to convert the direct current from the photovoltaic module into alternating current and transmitting the alternating current to the second compressor.
The photovoltaic air conditioner of claim 3, further comprising:

at least one rectifier coupled with the first inverter, the second inverter and the main control board; the rectifier is configured to convert alternating current of the power grid into direct current and transmit the direct current to the first inverter device and/or the second inverter device;

The first inverter device is further configured to convert the direct current from the rectifier into alternating current and transmit the alternating current to the first compressor;

the second inverter is further configured to convert the direct current from the rectifier into alternating current and transmit the alternating current to the second compressor;

The main control board is also configured to be in a refrigerating state or a heating state under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner is in the refrigerating state or the heating state; when the first compressor and the second compressor are required to work, the first switching circuit is controlled to conduct the first inverter device and the first compressor, the first inverter device is controlled to convert direct current from the rectifier into alternating current, and the alternating current is transmitted to the first compressor; and controlling the second inverter to convert the direct current from the rectifier into alternating current and transmit the alternating current to the second compressor.
The photovoltaic air conditioner according to any one of claims 1 to 5, further comprising: the instruction input device is coupled with the main control board; the instruction input device is configured to receive a user operation instruction and output instruction information;

Wherein the operation instruction includes at least one of an air supply state, a standby state, a cooling state, a heating state, and a set temperature, and the instruction information includes instruction information for controlling the start, stop, and operation frequency of the first compressor and/or the second compressor.
A control method of a photovoltaic air conditioner for controlling the photovoltaic air conditioner according to any one of claims 1 to 6, comprising:

under the condition that the photovoltaic air conditioner meets photovoltaic power generation, determining the working state of the photovoltaic air conditioner according to instruction information;

When the photovoltaic air conditioner is in an air supply state or a standby state, the first inverter device is controlled to convert direct current from the photovoltaic module into alternating current, and the first switch circuit is controlled to conduct the first inverter device and the power grid so that the alternating current converted by the first inverter device is output to the power grid;

When the photovoltaic air conditioner is in a refrigerating state or a heating state, the first inverter device is controlled to convert direct current from the photovoltaic module into alternating current, and the first switch circuit is controlled to conduct the first inverter device and the first compressor so that the alternating current converted by the first inverter device is output to the first compressor.
The control method of a photovoltaic air conditioner according to claim 7, further comprising at least one second compressor and at least one second inverter, the control method further comprising:

Under the condition that the photovoltaic air conditioner does not meet photovoltaic power generation, determining the working state of the photovoltaic air conditioner according to instruction information;

when the photovoltaic air conditioner is in a refrigerating state or a heating state, the first switching circuit is controlled to conduct the first inverter device with the power grid, the first inverter device is controlled to convert alternating current from the power grid into direct current, the second inverter device is controlled to convert the direct current converted from the first inverter device into alternating current, and the alternating current is transmitted to the second compressor.
The control method of a photovoltaic air conditioner according to claim 8, further determining whether the first compressor and the second compressor need to operate in determining an operating state of the photovoltaic air conditioner according to instruction information; the control method further includes:

under the condition that the photovoltaic air conditioner meets photovoltaic power generation, and when the photovoltaic air conditioner is in a refrigerating state or a heating state;

When the first compressor does not need to work, the first inverter device is controlled to convert direct current from the photovoltaic module into alternating current, and the first switch circuit is controlled to conduct the first inverter device and the power grid so that the alternating current converted by the first inverter device is output to the power grid; and controlling the second inverter to convert the direct current from the photovoltaic module into alternating current and transmitting the alternating current to the second compressor.
The control method of a photovoltaic air conditioner according to claim 9, further comprising: under the condition that the photovoltaic air conditioner meets photovoltaic power generation, and when the photovoltaic air conditioner is in a refrigerating state or a heating state;

When the first compressor and the second compressor are required to work, the first inverter device is controlled to convert direct current from the photovoltaic assembly into alternating current, and the first switch circuit is controlled to conduct the first inverter device and the first compressor so that the alternating current converted by the first inverter device is output to the first compressor; and controlling the second inverter to convert the direct current from the photovoltaic module into alternating current and transmitting the alternating current to the second compressor.
The control method of a photovoltaic air conditioner according to claim 9, further comprising at least one rectifier, the control method further comprising:

Under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner is in a refrigerating or heating state;

When the first compressor and the second compressor are required to work, the first switching circuit is controlled to conduct the first inverter device and the first compressor, the first inverter device is controlled to convert direct current from the rectifier into alternating current, and the alternating current is transmitted to the first compressor; and controlling the second inverter to convert the direct current from the rectifier into alternating current and transmit the alternating current to the second compressor.
A photovoltaic air conditioning system comprising:

A photovoltaic air conditioner according to any one of claims 1 to 6;

The photovoltaic module is coupled with the photovoltaic air conditioner; the photovoltaic module is used for converting solar energy into electric energy and transmitting the electric energy to the photovoltaic air conditioner.