CN114256879A

CN114256879A - Photovoltaic air conditioner, control method thereof and photovoltaic air conditioning system

Info

Publication number: CN114256879A
Application number: CN202210103307.9A
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: 2022-01-27
Publication date: 2022-03-29
Also published as: WO2023142261A1

Abstract

The invention discloses a photovoltaic air conditioner, a control method thereof and a photovoltaic air conditioning system, relates to the technical field of air conditioners, and can feed surplus electric energy generated by a photovoltaic module back to a power grid to obtain income. The photovoltaic air conditioner comprises a first compressor, a first inverter, a first switch circuit and a main control board, wherein the main control board is used for controlling the first inverter to convert direct current from a photovoltaic module into alternating current and controlling the first switch circuit to conduct the first inverter with a power grid when photovoltaic power generation is met and the photovoltaic air conditioner is in an air supply or standby state, so that the converted alternating current is output to the power grid; when the photovoltaic power generation is met and the photovoltaic air conditioner is in a refrigerating state or a heating state, the first inverter 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 and the first compressor, so that the converted alternating current is output to the first compressor. The invention is used for adjusting air parameters.

Description

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

Technical Field

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

Background

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

The air conditioner consumes a large amount of electric energy in the operation process, and in order to reduce the dependence on non-renewable energy, a photovoltaic air conditioning system which converts solar energy into electric energy through a photovoltaic module and provides the electric energy for the air conditioner is provided. 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 obtain income.

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

in one aspect, the invention provides a photovoltaic air conditioner, which comprises a first compressor, a first inverter, a first switch circuit and a main control board. The first inverter is used for converting 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 switch circuit is used for conducting the first inverter device with a power grid or conducting 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 device to convert direct current from the photovoltaic module into alternating current and controlling the first switch circuit to conduct the first inverter device with 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.

According to the photovoltaic air conditioner provided by the embodiment of the invention, under the condition that photovoltaic power generation is met and the photovoltaic air conditioner is in an air supply state or a standby state, direct current output by a photovoltaic module can be converted into alternating current and input into a power grid, so that the energy utilization rate is improved and the income is obtained; satisfy photovoltaic power generation, and the photovoltaic air conditioner is in the condition of refrigeration state or heating state, can convert the direct current that photovoltaic module exported into the alternating current and input first compressor to drive first compressor, thereby realize refrigeration or heat, reduce running cost. 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 supply the electric energy to 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 is in standby or supplies air, so that the energy utilization rate is improved, and the income is obtained.

On the other hand, the invention 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 judging whether the photovoltaic air conditioner meets photovoltaic power generation. And 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 another aspect, the invention further provides a photovoltaic air conditioning system, which comprises the photovoltaic air conditioner and the photovoltaic module. The photovoltaic module is coupled with the photovoltaic air conditioner and used for converting solar energy into electric energy and transmitting the electric energy to the photovoltaic air conditioner.

Compared with the prior art, the beneficial effects of the control method of the photovoltaic air conditioner and the photovoltaic air conditioning system provided by the invention are the same as those of the photovoltaic air conditioner provided by the technical scheme, and are not repeated herein.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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 a further 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 control method of a photovoltaic air conditioner according to some embodiments;

fig. 8 is a flowchart of another control method of a photovoltaic air conditioner according to some embodiments.

Reference numerals:

1-moving contact; 2-a first stationary contact; 3-a second stationary contact; 10-a first compressor; 11-a second compressor; 20-a first inverter 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; 50-a rectifier; 60-a command input device; 100-photovoltaic air conditioning; 1000-photovoltaic air conditioning system.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to 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 those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, expressions of "coupled" and "connected," and derivatives thereof, 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, some embodiments may be described using the term "coupled" to indicate that two or more elements are in direct physical or electrical contact. However, the terms "coupled" or "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 contents herein.

"at least one of A, B and C" has the same meaning as "A, B or at least one of C," each including the following combination of A, B and C: a alone, B alone, C alone, a and B in combination, a and C in combination, B and C in combination, and A, B and C in combination.

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

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

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

The present invention provides a photovoltaic air conditioner 100, referring to fig. 1, including 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 used to convert the 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 connect the first inverter device 20 to 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 device 20. The main control board 40 is configured to, when the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in an air supply state or a standby state, control the first inverter device 20 to convert direct current from the photovoltaic module 200 into alternating current, and control the first switch circuit 30 to connect 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; under the condition of meeting the photovoltaic power generation requirement and the photovoltaic air conditioner 100 being in the cooling state or the heating state, the first inverter device 20 is controlled to convert the direct current from the photovoltaic module 200 into the alternating current, and the first switch circuit 30 is controlled to connect the first inverter device 20 and the first compressor 10, so that the alternating current converted by the first inverter device 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 also includes other modes requiring the operation of the compressor, such as a defrosting mode or a dehumidifying mode.

As can be seen from the above, the photovoltaic air conditioner 100 according to the embodiment of the present invention can convert the direct current output by the photovoltaic module 200 into the alternating current and input the alternating current into the power grid 300 under the condition that the photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in the air supply state or the standby state, so as to improve the energy utilization rate and obtain the benefit; under the condition 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 output by the photovoltaic module 200 can be converted into alternating current and input into the first compressor 10 to drive the first compressor 10, so that cooling or heating is realized, and the operation cost is reduced. Compared with the prior art, the photovoltaic air conditioner 100 of the embodiment of the invention can convert solar energy into electric energy through the photovoltaic module 200 and supply the electric energy to the photovoltaic air conditioner 100 for use, and can also input the electric energy converted by the photovoltaic module 200 into a power grid when the photovoltaic air conditioner 100 is in standby or supplies air, so as to improve the energy utilization rate and obtain income.

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

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

It should be appreciated that the power grid 300 may be any of single phase, two phase, 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 grid 300.

For convenience of explanation, the following embodiments are exemplified by taking three-phase power as an example. Referring to fig. 1 and 2, the three-phase power will be described by taking a first phase as an R phase, a second phase as an S phase, and a third phase as a T phase as an example. It should be noted that fig. 2 is a circuit diagram of the photovoltaic air conditioning system shown in fig. 1, wherein 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 to the R phase, the S phase, and the 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 driving 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 the three-phase bridge circuit 23 to be turned on or off according to the instruction information. The three-phase bridge circuit 23 includes a first phase arm, a second phase arm, and a third phase arm connected in parallel.

Referring to fig. 2, the first phase arm includes a first upper arm formed by a first power transistor Q1 and a first diode D1 connected in anti-parallel, and a second upper arm formed by a second power transistor Q2 and a second diode D2 connected in anti-parallel. Control terminals of first power transistor Q1 and second power transistor Q2 are coupled to first drive board 22.

Referring to fig. 2, the second phase leg includes a second upper arm formed by a third power transistor Q3 and an anti-parallel connected third diode D3, and a second lower arm formed by a fourth power transistor Q4 and an anti-parallel connected fourth diode D4. Control terminals of third power transistor Q3 and fourth power transistor Q4 are coupled to first drive board 22.

Referring to fig. 2, the third phase leg includes a third upper arm formed by a fifth power transistor Q5 and an anti-parallel connected fifth diode D5, and a third lower arm formed by a sixth power transistor Q6 and an anti-parallel connected sixth diode D6. Control terminals of fifth power transistor Q5 and sixth power transistor Q6 are coupled to first drive board 22.

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

As shown in fig. 2, the first switching circuit 30 may be a relay. Illustratively, the first switching circuit 30 is a toggle-type relay coupled to the main control board 40 (not shown in fig. 2). The conversion type relay includes a movable contact 1, a first stationary contact 2, and a second stationary contact 3, the movable contact 1 being coupled with a first inverter device 20, the first stationary contact 2 being coupled with a first compressor 10, and the second stationary contact 3 being coupled with a power grid 300. Wherein, when the coil is not electrified, the movable contact 1 and one of the fixed contacts are opened and the other is closed, for example, the movable contact 1 and the first fixed contact 2 are opened, and the second fixed contact 3 is closed; when the coil is energized, the moving contact 1 and the original stationary contact are opened, and the other stationary contact is closed, for example, the moving contact 1 and the second stationary contact 3 are opened, and the first stationary contact 2 is closed, so as to achieve the purpose of line switching, i.e., to connect the first inverter 20 to the power grid 300 or to connect the first compressor 10.

In some embodiments, as shown in fig. 3 and 4, the first inverter device 20 is also used for converting ac power from the grid 300 into dc power.

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 includes one second compressor 11 in the following embodiments.

Referring to fig. 4, the second inverter device 21 is used to convert the dc power from the photovoltaic module 200 or the first inverter device 20 into ac power and transmit the ac power 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 first inverter device 20 may be specifically referred to for the second driving board 24 and the three-phase bridge circuit 23, which is not described herein again in this disclosure.

The main control board 40 is further configured to, under the condition that photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in the cooling state or the heating state, control the first switch circuit 30 to connect the first inverter device 20 with the power grid 300, control the first inverter device 20 to convert ac power from the power grid 300 into dc power, and control the second inverter device 21 to convert dc power converted from the first inverter device 20 into ac power and transmit the ac power to the second compressor 11.

That is to say, under the condition that the solar energy cannot be converted into the electric energy through the photovoltaic module 200 and provided to the photovoltaic air conditioner 100 for use, for example, at night or on a cloudy day, the photovoltaic air conditioner 100 may further be connected to the power grid 300, and the electric energy is provided by the power grid 300 to drive the second compressor 11, so that cooling or heating is realized, and normal use of the photovoltaic air conditioner 100 is ensured.

In addition, in the case that 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 a requirement.

Illustratively, referring to fig. 3 and 4, the main control board 40 is further configured to, when the first compressor 10 does not need to operate under the condition of satisfying photovoltaic power generation and the photovoltaic air conditioner 100 is in a cooling state or a heating state, control the first inverter device 20 to convert direct current from the photovoltaic module 200 into alternating current, and control the first switch circuit 30 to connect 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; and controlling the second inverter device 21 to convert the direct current from the photovoltaic module 200 into alternating current and transmit the alternating current to the second compressor 11.

That is to say, 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 to drive one compressor, the photovoltaic air conditioner 100 can input the redundant electric energy into the power grid 300 to obtain the profit while realizing the cooling or heating function by using the electric energy of the photovoltaic module 200.

It should be noted that, in the case that the photovoltaic air conditioner 100 can meet the requirement by driving one compressor, the main control board 40 may also 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 switch circuit 30 is controlled to connect the first inverter device 20 and 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 disconnected so as to disconnect the photovoltaic module 200 from the second compressor 11.

Illustratively, 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 direct current from the photovoltaic module 200 into alternating current and control the first switch circuit 30 to connect the first inverter device 20 and 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 transmit the alternating current to the second compressor 11. In this case, the photovoltaic air conditioner 100 has high cooling efficiency, and the power grid 300 is not required to provide electric energy, 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 further controls the second inverter device 21 to be disconnected, that is, the three-phase bridge circuit 23 in the second inverter device 21 is disconnected, so that the photovoltaic module 200 is disconnected from the second compressor 11, and the second compressor 11 is prevented from being started; and the first switch circuit 30 is controlled to connect the first inverter 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 income is obtained.

In some embodiments, as shown in fig. 5, the above-mentioned photovoltaic air conditioner 100 further includes at least one rectifier 50, and the rectifier 50 is coupled with the first inverter device 20, the second inverter device 21 and the main control panel 40. For convenience of explanation, the following embodiments exemplarily illustrate that the photovoltaic air conditioner 100 includes one rectifier 50.

Referring to fig. 5 and 6, the first inverter device 20 is also used 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 also serves 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 ac power of the power grid 300 into dc power and transmitting the dc power to the first inverter device 20 and/or the second inverter device 21.

In some embodiments, as shown in fig. 6, the rectifier 50 may include three parallel rectifying circuits, each of which includes two diodes connected in series. On the basis, the first phase, the second phase and the third phase of the three-phase power can correspond to a rectifying circuit 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, under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in the cooling state or the heating state, the main control board 40 may drive the first compressor 10 and/or the second compressor 11 according to the demand.

Illustratively, 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 alternating current and transmit the alternating current to the second compressor 11 when the first compressor 10 does not need to be operated under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in the 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 connect the first inverter device 20 and the first compressor 10 when the second compressor 11 does not need to operate under the condition that the photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in the cooling or heating state, so that the ac power 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 as to disconnect the grid 300 from the second compressor 21.

That is to say, under the condition that solar energy can not be converted into electric energy through photovoltaic module 200 and photovoltaic air conditioner 100 is satisfied with the use, photovoltaic air conditioner 100 can also insert electric wire netting 300, is provided with the electric energy by electric wire netting 300 to drive first compressor 10 or second compressor 11, thereby realizes refrigerating or heating, guarantees photovoltaic air conditioner 100's normal use.

Illustratively, referring to fig. 5 and 6, the main control board 100 is further configured to, under the condition that photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in a cooling or heating state, 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 direct current from the rectifier 50 into 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; and, the second inverter device 21 is controlled to convert the direct current from the rectifier 50 into alternating current and transmit the alternating current to the second compressor 11.

That is, in the case that the solar energy cannot be converted into the electric energy by the photovoltaic module 200 and provided to the photovoltaic air conditioner 100 for use, the photovoltaic air conditioner 100 may further access the power grid 300, and the electric energy is provided by the power grid 300 to drive the first compressor 10 and the second compressor 11, so as to implement efficient cooling or heating.

On the other hand, an embodiment of the present invention further provides a control method of the photovoltaic air conditioner 100, and with reference 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 the 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. Under the condition that 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 judged to meet the photovoltaic power generation; and under the condition that the actual power of the photovoltaic module 200 is smaller than the maximum power of the photovoltaic air conditioner 100, judging that the photovoltaic air conditioner 100 does not meet the photovoltaic power generation.

It should be noted that before determining whether the photovoltaic air conditioner 100 satisfies the photovoltaic power generation, the photovoltaic air conditioner 100 further needs to perform self-checking, and the like, and the disclosure is not limited in this respect.

S200: with reference to fig. 2, the operating state of the photovoltaic air conditioner 100 is determined.

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

For example, in the case that 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 executes S300; for another example, when the photovoltaic air conditioner 100 satisfies the photovoltaic power generation, the user inputs a cooling state or a heating state, and 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 device 20 is controlled to convert the dc power from the photovoltaic module 200 into ac power, and the first switch circuit 30 is controlled to connect the first inverter device 20 to the power grid 300.

At this time, as shown in fig. 1 and fig. 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 the benefit.

S400: the first inverter device 20 is controlled to convert the dc power from the photovoltaic module 200 into ac power, and the first switching circuit 30 is controlled to connect the first inverter device 20 and the first compressor 10.

At this time, as shown in fig. 1 and fig. 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, so as to implement cooling or heating, and reduce the operation cost.

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

In the case where 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 connect the first inverter device 20 to the power grid 300, the first inverter device 20 is controlled to convert ac power from the power grid 300 into dc power, and the second inverter device 21 is controlled to convert dc power converted from the first inverter device 20 into ac power and transmit the ac power to the second compressor 11.

At this time, referring to fig. 3 and 4, in a case that the photovoltaic module 200 cannot convert the solar energy into the electric energy and provide the electric energy to the photovoltaic air conditioner 100 for use, for example, at night or on a cloudy day, the photovoltaic air conditioner 100 may further access the power grid 300, and the power grid 300 provides the electric energy to drive the second compressor 11, so that cooling or heating is realized, and normal use of the photovoltaic air conditioner 100 is ensured.

On the basis, in the process of determining the working state of the photovoltaic air conditioner 100 according to the instruction information, whether the first compressor 10 and the second compressor 11 need to work or not needs to be determined; in this case, 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: referring to fig. 4, it is determined whether the first compressor 10 and the second compressor 11 need to be operated.

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

S700: referring to fig. 4, the first inverter device 20 is controlled to convert the direct current from the photovoltaic module 200 into the alternating current, the first switching circuit 30 is controlled to connect the first inverter device 20 to the power grid 300, and the second inverter device 21 is controlled to convert the direct current from the photovoltaic module 200 into the 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 while realizing the cooling or heating function by using the electric energy of the photovoltaic module 200, thereby obtaining the profit.

S800: referring to fig. 4, the first inverter device 20 is controlled to convert the direct current from the photovoltaic module 200 into the alternating current, the first switching circuit 30 is controlled to connect the first inverter device 20 and the first compressor 10, and the second inverter device 21 is controlled to convert the direct current from the photovoltaic module 200 into the alternating current and transmit the alternating current to the second compressor 11.

At this time, the photovoltaic air conditioner 100 has high 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 that the photovoltaic air conditioner 100 further includes at least one rectifier 50, referring to fig. 8, the control method may further include S900.

Under 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 is required to be started, the second compressor 11 can be selected to be started, i.e., S500 is performed. In the process of performing S500, the second inverter device 21 may convert and transmit the dc power converted from the first inverter device 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 connect the first inverter device 20 to the first compressor 10, and the first inverter device 20 is controlled to convert the direct current from the rectifier 50 into the alternating current and transmit the alternating current to the first compressor 10; and, the second inverter device 21 is controlled to convert the direct current from the rectifier 50 into alternating current and transmit the alternating current to the second compressor 11.

At this time, in the case that the solar energy cannot be converted into electric energy by the photovoltaic module 200 and provided to the photovoltaic air conditioner 100 for use, the photovoltaic air conditioner 100 may further access the power grid 300, and the electric energy is provided by the power grid 300 to drive the first compressor 10 and the second compressor 11, so as to implement efficient cooling or heating.

In another aspect, an embodiment of the present invention further provides a photovoltaic air conditioning system 1000, and referring to fig. 1, the photovoltaic air conditioning system 1000 includes the photovoltaic air conditioner 100 and the photovoltaic module 200 according to any one 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 description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are 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;

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

a first switching circuit coupled to the first inverter device and the first compressor; the first switching circuit is used for connecting the first inverter with a power grid or the first compressor;

the main control board is coupled with the first switch circuit and the first inverter device; the main control board is used for controlling the main control board,

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 with 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.

2. The photovoltaic air conditioner of claim 1, wherein the first inverter device is further configured to convert ac power from the grid into dc power; the photovoltaic air conditioner further comprises:

at least one second compressor;

at least one second inverter device, each second inverter device coupled to a second compressor; the second inverter device is used for converting the direct current from the photovoltaic module or the first inverter device into alternating current and transmitting the alternating current to the second compressor;

the main control board is also coupled with the second inverter; the main control board is also used for controlling the main control board,

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 switch circuit is controlled to conduct the first inverter device and 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.

3. The photovoltaic air conditioner according to claim 2, wherein the main control panel is further configured to, when 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 with 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 device to convert the direct current from the photovoltaic module into alternating current and transmit the alternating current to the second compressor.

4. The photovoltaic air conditioner according to claim 3, wherein the main control panel is further configured to, when 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 both 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 first compressor, so that the alternating current converted by the first inverter device is output to the first compressor; and controlling the second inverter device to convert the direct current from the photovoltaic module into alternating current and transmit the alternating current to the second compressor.

5. The photovoltaic air conditioner of claim 3, further comprising:

at least one rectifier coupled to the first inverter device, the second inverter device, and the main control board; the rectifier is used for converting the alternating current of the power grid into direct current and transmitting the direct current to the first inverter device and/or the second inverter device;

the first inverter device is also used for converting the direct current from the rectifier into alternating current and transmitting the alternating current to the first compressor;

the second inverter device is also used for converting the direct current from the rectifier into alternating current and transmitting the alternating current to the second compressor;

the main control board is also used for controlling the photovoltaic air conditioner to be in a refrigerating state or a heating state under the condition that the photovoltaic power generation is not met; when the first compressor and the second compressor both need 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 device to convert the direct current from the rectifier into alternating current and transmit the alternating current to the second compressor.

6. 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 used for receiving a user operation instruction and outputting instruction information;

the operation instruction comprises at least one of an air supply state, a standby state, a refrigeration state, a heating state and a set temperature, and the instruction information comprises instruction information for controlling the starting, stopping and operating frequency of the first compressor and/or the second compressor.

7. A control method of a photovoltaic air conditioner, which is used for controlling the photovoltaic air conditioner as claimed in any one of claims 1 to 6, and comprises the following steps:

judging whether the photovoltaic air conditioner meets photovoltaic power generation;

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, 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;

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.

8. The control method of the photovoltaic air conditioner according to claim 7, wherein the photovoltaic air conditioner further comprises at least one second compressor and at least one second inverter device, and the control method further comprises:

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 cooling state or a heating state, the first switch circuit is controlled to conduct the first inverter device and 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 from the first inverter device into alternating current, and the alternating current is transmitted to the second compressor.

9. The control method of the photovoltaic air conditioner according to claim 8, wherein in the process of determining the operating state of the photovoltaic air conditioner according to the instruction information, it is further determined whether the first compressor and the second compressor need to operate; the control method further comprises the following steps:

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;

10. The control method of the photovoltaic air conditioner as claimed in 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;

11. The control method of the photovoltaic air conditioner according to claim 9, wherein the photovoltaic air conditioner further comprises at least one rectifier, and the control method further comprises:

under the conditions that photovoltaic power generation is not met and the photovoltaic air conditioner is in a refrigerating or heating state;

when the first compressor and the second compressor both need 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 device to convert the direct current from the rectifier into alternating current and transmit the alternating current to the second compressor.

12. A photovoltaic air conditioning system, comprising:

the photovoltaic air conditioner is the photovoltaic air conditioner as claimed in any one of claims 1 to 6;

the photovoltaic component 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.