CN116557991A

CN116557991A - Photovoltaic air conditioner, control method thereof and photovoltaic air conditioning system

Info

Publication number: CN116557991A
Application number: CN202210099803.1A
Authority: CN
Inventors: 刘洋; 徐鹏洋; 李希志
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: 2022-01-27
Publication date: 2023-08-08

Abstract

The invention discloses a photovoltaic air conditioner, which comprises: a first compressor; the first inverter is used for converting direct current from the photovoltaic module into alternating current; a first switching circuit coupled with the first inverter and the first compressor; the main control board is coupled with the first switch circuit and the first inverter; the main control board is used for controlling the first inverter to convert direct current from the photovoltaic module into alternating current under the condition that photovoltaic power generation is met and the photovoltaic air conditioner is in an air supply state or a standby state, and controlling the first switch circuit to conduct the first inverter with the power grid so that the alternating current converted by the first inverter is output to the power grid.

Description

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

Technical Field

The invention relates to the technical field of air conditioners, 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.

In order to reduce the dependence on non-renewable energy sources, photovoltaic air conditioning systems which convert solar energy into electric energy through a photovoltaic module and provide the electric energy to the air conditioner are developed. 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

The embodiment of the invention provides a photovoltaic air conditioner, a control method thereof and a photovoltaic air conditioning system, which can feed redundant electric energy generated by a photovoltaic module back to a power grid, improve the energy utilization rate and acquire benefits.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:

a photovoltaic air conditioner comprising:

a first compressor;

the first inverter is used for converting direct current from the photovoltaic module into alternating current;

a first switching circuit coupled with the first inverter and the first compressor;

the main control board is coupled with the first switch circuit and the first inverter; the main control board is 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, 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.

In some embodiments of the present application, the main control board is further 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 with the first compressor, so that the alternating current converted by the first inverter device is output to the first compressor when photovoltaic power generation is satisfied and the photovoltaic air conditioner is in a cooling state or a heating state.

In some embodiments of the present application, the first inverter device is further configured to convert alternating current from the power grid into direct current.

In some embodiments of the present application, the first switching circuit is configured to conduct the first inverter device to a power grid.

In some embodiments of the present application, the first inverter device is in communication with the first compressor.

In some embodiments of the present application, further comprising: the instruction input device is coupled with the main control board; the instruction input device is used for receiving a user operation instruction and outputting 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 start, stop, and operation frequency of the first compressor.

In some embodiments of the present application, there is further provided a control method of a photovoltaic air conditioner, for controlling the photovoltaic air conditioner, including:

judging whether the photovoltaic air conditioner meets photovoltaic power generation or not;

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.

In some embodiments of the present application, there is also provided a photovoltaic air conditioning system comprising:

the photovoltaic air conditioner according to any one of the above embodiments;

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.

The photovoltaic air conditioner provided by the embodiment of the invention can convert direct current output by the photovoltaic module into alternating current and input the alternating current into a 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 energy utilization rate is improved and benefits are obtained; under the condition that photovoltaic power generation is met and the photovoltaic air conditioner is in a refrigerating state or a heating state, direct current output by the photovoltaic module can be converted into alternating current and input into the first compressor so as to drive the first compressor, so that refrigeration or heating is realized, and the running cost is reduced. Compared with the prior art, the photovoltaic air conditioner provided by the embodiment of the invention can convert solar energy into electric energy through the photovoltaic module and provide the electric energy for the photovoltaic air conditioner for use, and can also input the electric energy converted by the photovoltaic module into a power grid when the photovoltaic air conditioner stands by or sends air, so that the energy utilization rate is improved, and benefits are obtained.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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.

Reference numerals:

1-a movable contact; 2-a first stationary contact; 3-a second stationary contact; 10-a first compressor; 11-a second compressor; 20-a first inversion device; 21-a second inverter device; 22-a first drive plate; 23-a three-phase bridge circuit; 24-a second drive plate; 30-a first switching circuit; 40, a main control board; a 50-rectifier; 60-instruction input means; 100-photovoltaic air conditioner; 1000-photovoltaic air conditioning system.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, 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 describing the present invention 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 invention.

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 invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, 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 co-operate 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," both include 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 detected [ stated condition or event ]" is optionally interpreted to mean "upon determining … …" or "in response to determining … …" or "upon detecting [ stated condition or event ]" or "in response to detecting [ 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 invention provides a photovoltaic air conditioner 100, referring to fig. 1, comprising a first compressor 10, a first inverter 20, a first switch 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 to the first inverter device 20 and the first compressor 10, and the first switching circuit 30 is used to conduct the first inverter device 20 to the power grid 300 or conduct the first compressor 10.

The main control board 40 is coupled to the first switch circuit 30 and the first inverter 20. The main control board 40 is used for controlling the first inverter device 20 to convert direct current from the photovoltaic module 200 into alternating current and controlling the first switch circuit 30 to conduct the first inverter device 20 and the power grid 300 so as to output the alternating current converted by the first inverter device 20 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 the embodiment of the present invention, 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 benefits; 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. Compared with the prior art, in the photovoltaic air conditioner 100 of the embodiment of the invention, when the photovoltaic module 200 converts solar energy into electric energy and provides the electric energy 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 stands by or sends air, so that the energy utilization rate is improved and the benefit is obtained.

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. It should be noted that fig. 2 is a circuit diagram of the photovoltaic air conditioning system shown in fig. 1, where the instruction input device 60 is not illustrated 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 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 bridge arm includes a first upper arm formed by a first power transistor Q1 and an antiparallel first diode D1, and a second upper arm formed by a second power transistor Q2 and an antiparallel second diode D2. The control terminals of the first and second power transistors Q1 and 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 terminals of the third and fourth power transistors Q3 and Q4 are coupled to the first driving plate 22.

Referring to fig. 2, the third phase bridge arm includes a third upper arm formed by a fifth power transistor Q5 and an antiparallel fifth diode D5, and a third lower arm formed by a sixth power transistor Q6 and an antiparallel sixth diode D6. The control terminals of the fifth and sixth power transistors Q5 and Q6 are coupled to the first driving plate 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. Wherein when the coil is not energized, the movable contact 1 and one of the stationary contacts are opened and the other is closed, e.g. 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 also used 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 second driving board 24 and the three-phase bridge circuit 23 may refer to the first inverter device 20 specifically, which is not described herein.

The main control board 40 is further configured to control the first switch circuit 30 to conduct the first inverter device 20 with the power grid 300, control the first inverter device 20 to convert the ac power from the power grid 300 into dc power, control the second inverter device 21 to convert the dc power converted from the first inverter device 20 into ac power, and transmit the ac power 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 is provided for the photovoltaic air conditioner 100 to 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.

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.

As an 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 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; 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 demand, and the electric energy converted by the photovoltaic module 200 is greater than the electric energy required by 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, can 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 the first switching circuit 30 is controlled 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 used 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 used for converting the alternating current of the power grid 300 into direct current and transmitting the direct current to the first inverter device 20 and/or the second inverter device 21.

In some embodiments, as shown in fig. 6, rectifier 50 may include three rectifying circuits in parallel, each rectifying circuit including two diodes in series. On this basis, the first, second and third phases of the three-phase power may correspond to one rectifying circuit and be 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.

As an example, referring to fig. 5 and 6, the main control board 100 is further configured to control the first switch 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 the first compressor 10 and the second compressor 11 are both 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; 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 invention further provides a control method of the photovoltaic air conditioner 100, and 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, the actual power of the photovoltaic module 200 may be compared with the maximum power of the photovoltaic air conditioner 100. Wherein, when the actual power of the photovoltaic module 200 is greater than or equal to the maximum power of the photovoltaic air conditioner 100, the photovoltaic air conditioner 100 is determined to meet the 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 specifically limited herein.

S200: referring to fig. 2, 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: referring to fig. 2, the first inverter 20 is controlled to convert dc power from the photovoltaic module 200 into ac power, and the first switching circuit 30 is controlled to turn on the first inverter 20 and 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: referring to fig. 4, the first switching circuit 30 is controlled to turn on the first inverter device 20 and the power grid 300, the first inverter device 20 is controlled to convert the ac power from the power grid 300 into dc power, the second inverter device 21 is controlled to convert the dc power converted from the first inverter device 20 into ac power, and the ac power is transmitted 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 is 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, in the process of determining the working state of the photovoltaic air conditioner 100 according to the instruction information, it is also required to determine whether the first compressor 10 and the second compressor 11 need to work; 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: in connection with fig. 4, 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-described S400 is performed, 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: referring to fig. 4, 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 power grid 300, and the second inverter 21 is controlled to convert direct current from the photovoltaic module 200 into alternating current, and to 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: referring to fig. 4, 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, and the second inverter 21 is controlled to convert direct current from the photovoltaic module 200 into alternating current, and to 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 the process of S500, the second inverter 21 may convert and transmit the dc power converted from the first inverter 20 to the second compressor 11, or may convert and transmit the dc power from the rectifier 50 to the second compressor 11.

S900: referring to fig. 6, 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 the alternating current and to 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, an embodiment of the present invention further provides a photovoltaic air conditioning system 1000, referring to fig. 1, where the photovoltaic air conditioning system 1000 includes the photovoltaic air conditioner 100 and the photovoltaic module 200 described in any of the foregoing 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 present invention is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A photovoltaic air conditioner, comprising:

a first compressor;

2. The photovoltaic air conditioner of claim 1, wherein the main control board is further configured to control the first inverter to convert direct current from the photovoltaic module into alternating current and control the first switch circuit to conduct the first inverter with the first compressor so that the alternating current converted by the first inverter is output to the first compressor when photovoltaic power generation is satisfied and the photovoltaic air conditioner is in a cooling state or a heating state.

3. The photovoltaic air conditioner of claim 1, wherein the first inverter is further configured to convert alternating current from the power grid to direct current.

4. The photovoltaic air conditioner of claim 1, wherein the first switching circuit is configured to conduct the first inverter device to a power grid.

5. The photovoltaic air conditioner of claim 1, wherein the first inverter is in communication with the first compressor.

6. The photovoltaic air conditioner of any one of claims 1-5, further comprising: the instruction input device is coupled with the main control board; the instruction input device is used for receiving a user operation instruction and outputting instruction information;

7. A control method of a photovoltaic air conditioner according to any one of claims 1 to 6, comprising:

8. A photovoltaic air conditioning system, comprising:

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