WO2023142261A1

WO2023142261A1 - Photovoltaic air conditioner and control method therefor and photovoltaic air conditioner system

Info

Publication number: WO2023142261A1
Application number: PCT/CN2022/084066
Authority: WO
Inventors: 刘洋; 何成军; 单烁
Original assignee: 青岛海信日立空调系统有限公司
Priority date: 2022-01-27
Filing date: 2022-03-30
Publication date: 2023-08-03
Also published as: CN114256879A; CN118044088A

Abstract

The present invention provides a photovoltaic air conditioner and a control method therefor and a photovoltaic air conditioner system. The photovoltaic air conditioner comprises a first compressor, a first inverter device, a first switch circuit, and a main control board. The main control board is configured to when the photovoltaic power generation is satisfied and the photovoltaic air conditioner is in an air supply or standby state, control the first inverter device to convert direct current from a photovoltaic assembly into alternating current, and control the first switch circuit to connect the first inverter device to a power grid, such that the alternating current obtained by converting is output to the power grid; and when the photovoltaic power generation is satisfied and the photovoltaic air conditioner is in a cooling or heating state, control the first inverter device to convert direct current from the photovoltaic assembly into alternating current, and control the first switch circuit to connect the first inverter device to the first compressor, such that the alternating current obtained by converting is output to the first compressor.

Description

Photovoltaic air conditioner and its control method, photovoltaic air conditioner system

This disclosure claims the priority of the Chinese patent application with application number 202210103307.9 filed on January 27, 2022, the entire contents of which are incorporated in this disclosure by reference.

technical field

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

Background technique

The air conditioner is a kind of heat exchange equipment, including the indoor unit of the air conditioner, which is installed indoors, and the heat or cold generated by the heating or cooling of the internal system of the air conditioner is sent to the room through the fan, so as to achieve the purpose of adjusting the indoor temperature.

However, air conditioners consume a lot of electricity during operation. In order to reduce the dependence on non-renewable energy, photovoltaic air-conditioning systems that convert solar energy into electrical energy through photovoltaic modules and provide electrical energy to air conditioners have emerged. However, when photovoltaic modules generate large amounts of electricity in sunny conditions, the excess electricity can be wasted.

Contents of the invention

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

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

The main control board is coupled to the first switch circuit and the first inverter device. The main control board is configured to control the first inverter device to convert the direct current from the photovoltaic module into alternating current when the photovoltaic power generation is satisfied and the photovoltaic air conditioner is in the air supply state or the standby state, And control the first switch circuit to conduct the first inverter device with the grid, so that the alternating current converted by the first inverter device is output to the grid; when photovoltaic power generation is satisfied, and the photovoltaic When the air conditioner is in cooling state or heating state, control the first inverter device to convert the direct current from the photovoltaic module into alternating current, and control the first switch circuit to connect the first inverter device with the The first compressor is turned on, so that the alternating current converted by the first inverter device is output to the first compressor.

On the other hand, the present disclosure also provides a method for controlling the photovoltaic air conditioner, which is used to control the above photovoltaic air conditioner, including: when the photovoltaic air conditioner satisfies photovoltaic power generation, according to the instruction information, determine the location where the photovoltaic air conditioner is located. working status. The working states at least include a blowing state, a standby state, a cooling state and a heating state. When the photovoltaic air conditioner is in the air supply state or standby state, control the first inverter device to convert the direct current from the photovoltaic module into alternating current, and control the first switch circuit to convert the first inverter device Conducting with the grid, so that the alternating current converted by the first inverter device is output to the grid. When the photovoltaic air conditioner is in cooling state or heating state, control the first inverter device to convert the direct current from the photovoltaic module into alternating current, and control the first switch circuit to convert the first inverter device Conducting with the first compressor, so that the alternating current converted by the first inverter device is output to the first compressor.

In yet another aspect, the present disclosure also provides a photovoltaic air conditioner system, including the above photovoltaic air conditioner and a photovoltaic module. The photovoltaic component is coupled to the photovoltaic air conditioner, and the photovoltaic component is used to convert solar energy into electrical energy and transmit the electrical energy to the photovoltaic air conditioner.

Description of drawings

In order to illustrate the technical solutions in the present disclosure more clearly, the following will briefly introduce the accompanying drawings required in some embodiments of the present disclosure, however, the accompanying drawings in the following description are only drawings of some embodiments of the present disclosure , for those skilled in the art, other drawings can also be obtained according to these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of signals, and the like.

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

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

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

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

Fig. 5 is a structural block diagram of 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 flowchart 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.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, not all of them. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the term "comprise" and other forms such as the third person singular "comprises" and the present participle "comprising" are used Interpreted as the meaning of openness and inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific examples" example)" or "some examples (some examples)" etc. are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or examples are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

In describing the present disclosure, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the present disclosure.

The terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

In the description of the present disclosure, the expressions "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used when describing some embodiments 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 by the context herein.

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

As used herein, the term "if" is optionally interpreted to mean "when" or "at" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that ..." or "if [the stated condition or event] is detected" are optionally construed to mean "when determining ..." or "in response to determining ..." depending on the context Or "upon detection of [stated condition or event]" or "in response to detection of [stated condition or event]".

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

The present disclosure provides a photovoltaic air conditioner 100 . Referring to FIG. 1 , the photovoltaic air conditioner 100 includes a first compressor 10 , a first inverter device 20 , a first switch circuit 30 and a main control board 40 .

Please continue to refer to FIG. 1 , the first inverter device 20 is configured to convert the DC power from the photovoltaic module 200 into AC power. The first switch circuit 30 is coupled to the first inverter device 20 and the first compressor 10 , and the first switch circuit 30 is configured to connect the first inverter device 20 to the grid 300 or the first compressor 10 .

The main control board 40 is coupled to the first switch circuit 30 and the first inverter device 20 . The main control board 40 is configured to control the first inverter device 20 to convert the direct current from the photovoltaic module 200 into alternating current and control the first The switch circuit 30 connects the first inverter device 20 with the grid 300, so that the alternating current converted by the first inverter device 20 is output to the grid 300; Next, control the first inverter device 20 to convert the direct current from the photovoltaic module 200 into alternating current, and control the first switch circuit 30 to conduct the first inverter device 20 with the first compressor 10, so that the first inverter device 20 the converted AC power is output to the first compressor 10 .

It should be noted that the cooling state or heating state here does not only represent the cooling or heating mode of the photovoltaic air conditioner 100 , but also includes other modes that require the compressor to work, such as defrosting mode or dehumidification mode.

It can be seen from the above that the photovoltaic air conditioner 100 of some embodiments of the present disclosure can convert the direct current output by the photovoltaic module 200 into alternating current and input it into the power grid when photovoltaic power generation is satisfied and the photovoltaic air conditioner 100 is in the air supply state or the standby state. 300, in order to improve energy utilization and obtain income; in the case of satisfying photovoltaic power generation and the photovoltaic air conditioner 100 is in the cooling state or heating state, the direct current output by the photovoltaic module 200 can be converted into alternating current and input to the first compressor 10, to drive the first compressor 10, so as to realize cooling or heating, and reduce operating costs. In the photovoltaic air conditioner 100 of some embodiments of the present disclosure, when the photovoltaic module 200 converts solar energy into electrical energy and provides it to the photovoltaic air conditioner 100, it can also convert the solar energy converted by the photovoltaic module 200 when the photovoltaic air conditioner 100 is in standby or blowing air. Electric energy is input into the grid to improve energy utilization and obtain income.

The above-mentioned photovoltaic air conditioner 100 also includes a command input device 60 coupled to the main control board 40, and the command input device 60 is used to receive user operation commands and output command information.

Here, the operation instruction includes at least one of the air supply state, the standby state, the cooling state, the heating state and the set temperature, and the instruction information includes controlling the first compressor 10 and/or the second compressor 11 (see FIG. 3 ) command information of start, stop and running frequency. That is to say, the main control board 40 can judge the required running state of the photovoltaic air conditioner 100 and the running frequency of the compressor according to the command information output by the command input device 60 .

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

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

For ease of description, three-phase electricity is taken as an example in the following embodiments for exemplary description. In three-phase electricity, referring to Fig. 1 and Fig. 2, the first phase is R phase, the second phase is S phase, and the third phase is T phase as an example for illustration. It should be noted that FIG. 2 is a circuit diagram of the photovoltaic air-conditioning system shown in FIG. 1 , and the command input device 60 is not shown in FIG. 2 .

As shown in FIG. 1 and FIG. 2 , the above-mentioned first compressor 10 may be a permanent magnet synchronous motor, and the three stators of the permanent magnet synchronous motor are respectively connected to the R phase, S phase and T phase of the three-phase electricity in one-to-one correspondence.

As shown in FIGS. 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 from 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 bridge arm, a second phase bridge arm and a third phase bridge arm connected in parallel.

Referring to FIG. 2, the first phase bridge arm includes a first upper arm composed of a first power transistor Q1 and a first antiparallel diode D1, and a second upper arm composed of a second power transistor Q2 and an antiparallel first diode D2. upper arm. The control terminal of the first power transistor Q1 and the control terminal of the second power transistor Q2 are coupled to the first driving board 22 .

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

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

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

As shown in FIG. 2 , the above-mentioned first switch circuit 30 may be a relay. Exemplarily, the first switch circuit 30 is a switching relay, and the switching relay is coupled to the main control board 40 (not shown in FIG. 2 ). The conversion relay includes a moving contact 1, a first static contact 2 and a second static contact 3, the moving contact 1 is coupled to the first inverter device 20, the first static contact 2 is coupled to the first compressor 10 connected, the second static contact 3 is coupled to the grid 300 . When the coil is not energized, the movable contact 1 is disconnected from one of the static contacts and the other is closed, for example, the movable contact 1 is disconnected from the first static contact 2, and the second static contact 3 is closed; in the coil When energized, the movable contact, the movable contact 1 and the original static contact are disconnected, and the other static contact is closed, for example, the movable contact 1 and the second static contact 3 are disconnected, and the first static contact is disconnected 2 is closed, so as to achieve the purpose of line switching, that is, to conduct the first inverter device 20 with the power grid 300 or to conduct the first compressor 10 .

In some embodiments, as shown in FIG. 3 and FIG. 4 , the first inverter device 20 is further configured to convert AC power from the grid 300 into DC power.

On this basis, as shown in FIG. 3 , the photovoltaic air conditioner 100 also includes at least one second compressor 11 and at least one second inverter device 21, each second inverter device 21 is connected to a second compressor 11 and the main The control board 40 is coupled. For ease of description, in the following embodiments, the photovoltaic air conditioner 100 includes a second compressor 11 as an example for illustration.

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, the structures of the second driving board 24 and the three-phase bridge circuit 23 can refer to the first The inverter device 20 is not described in detail in this disclosure.

The main control board 40 is also used to control the first switch circuit 30 to connect the first inverter device 20 to the power grid 300 under the conditions that photovoltaic power generation is not satisfied and the photovoltaic air conditioner 100 is in a cooling state or a heating state, and controls the first An inverter device 20 converts AC power from the grid 300 into DC power, controls the second inverter device 21 to convert the DC power converted from the first inverter device 20 into AC power, and transmits the AC power to the second compressor 11 .

That is to say, when the solar energy cannot be converted into electrical energy through the photovoltaic module 200 and provided to the photovoltaic air conditioner 100 for use, for example, at night or on cloudy days, the photovoltaic air conditioner 100 can also be connected to the grid 300, and the grid 300 provides electrical energy. To drive the second compressor 11 to realize cooling or heating, so as to ensure the normal use of the photovoltaic air conditioner 100 .

In addition, when 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 can drive the first compressor 10 and/or the second compressor 11 according to requirements.

Exemplarily, referring to FIG. 3 and FIG. 4 , the main control board 40 is further configured to control the The first inverter device 20 converts the direct current from the photovoltaic module 200 into alternating current, and controls the first switch circuit 30 to conduct the first inverter device 20 with the grid 300, so that the alternating current converted by the first inverter device 20 is output to The grid 300 ; and, controlling the second inverter device 21 to convert the DC power from the photovoltaic module 200 into AC power, and transmit the AC power to the second compressor 11 .

That is to say, when the photovoltaic air conditioner 100 can drive a compressor to meet the demand, and the electric energy converted by the photovoltaic module 200 is greater than the electric energy required to drive a compressor, the photovoltaic air conditioner 100 uses the electric energy of the photovoltaic module 200 to realize cooling or heating. At the same time, the excess electric energy can be input into the grid 300 to obtain income.

It should be noted that, in the case that the photovoltaic air conditioner 100 can drive only one compressor to meet the demand, the main control board 40 can also only drive the first compressor 10 . Exemplarily, the first inverter device 20 is controlled to convert the direct current from the photovoltaic module 200 into alternating current, and the first switch circuit 30 is controlled to conduct the first inverter device 20 with the first compressor 10, so that the first inverter The alternating current converted by the inverter device 20 is output to the first compressor 10;

Exemplarily, referring to FIG. 3 and FIG. 4 , the main control board 40 is also used for when the first compressor 10 and the second compressor 11 When both need to work, control the first inverter device 20 to convert the DC power from the photovoltaic module 200 into AC power, and control the first switch circuit 30 to conduct the first inverter device 20 and the first compressor 10, so that the first The alternating current converted by the inverter device 20 is output to the first compressor 10 ; In this case, the cooling efficiency of the photovoltaic air conditioner 100 is relatively high, and the power grid 300 is not required to provide electric energy, thereby saving costs.

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 above-mentioned main control board 40 also controls the second inverter device 21 to be disconnected, that is, the second inverter device 21 The three-phase bridge circuit 23 is disconnected, so that the photovoltaic assembly 200 is disconnected from the second compressor 11, preventing the second compressor 11 from starting; through, so that the maximum amount of electric energy converted by the photovoltaic module 200 is input into the grid 300 to obtain income.

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 device 20 , the second inverter device 21 and the main control board 40 . For ease of description, in the following embodiments, the photovoltaic air conditioner 100 includes a rectifier 50 as an example for illustration.

Referring to FIGS. 5 and 6 , the first inverter device 20 is further configured to convert the DC power from the rectifier 50 into AC power, and transmit the AC power to the first compressor 10 . The second inverter device 21 is also configured to convert the DC power from the rectifier 50 into AC power, and transmit the AC power to the second compressor 11 . The rectifier 50 is configured to convert the AC power of the grid 300 into a DC power and transmit it to the first inverter device 20 and/or the second inverter device 21 .

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

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

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

Exemplarily, referring to Fig. 5 and Fig. 6, the main control board 40 is further configured to control the The second inverter device 21 converts the DC power converted from the first inverter device 20 and/or the DC power from the rectifier 50 into AC power, and transmits the AC power to the second compressor 11 .

Exemplarily, referring to Fig. 5 and Fig. 6, the main control board 40 is further configured to control the The first switch circuit 30 connects the first inverter device 20 to the first compressor 10, so that the alternating current converted by the first inverter device 20 is output to the first compressor 10; and controls the second inverter device 21 to be turned off. to disconnect the grid 300 from the second compressor 21.

That is to say, in the case that the solar energy cannot be converted into electrical energy by the photovoltaic module 200 and the photovoltaic air conditioner 100 can be used, the photovoltaic air conditioner 100 can also be connected to the grid 300, and the grid 300 provides electrical energy to drive the first compressor 10 or The second compressor 11 realizes cooling or heating to ensure the normal use of the photovoltaic air conditioner 100 .

Exemplarily, referring to FIG. 5 and FIG. 6 , the main control board 100 is also configured to operate when the first compressor 10 and the second compressor 11, when both need to work, control the first switch circuit 30 to conduct the first inverter device 20 and the first compressor 10, control the first inverter device 20 to convert the direct current from the rectifier 50 into alternating current, and transmit the alternating current to The first compressor 10 ; and, controlling the second inverter device 21 to convert the DC power from the rectifier 50 into AC power, and transmit the AC power to the second compressor 11 .

That is to say, in the case that the solar energy cannot be converted into electrical energy through the photovoltaic module 200 and provided to the photovoltaic air conditioner 100, the photovoltaic air conditioner 100 can also be connected to the grid 300, and the grid 300 provides electrical energy to drive the first compressor 10 and the second compressor 11, so as to realize high-efficiency cooling or heating.

On the other hand, an embodiment of the present disclosure further provides a control method of the photovoltaic air conditioner 100 described above. Referring to FIG. 7 , the control method includes S100-S400.

S100: Combining with FIG. 2, judge whether the photovoltaic air conditioner 100 meets photovoltaic power generation requirements.

Here, by comparing the actual power of the photovoltaic module 200 with the maximum power of the photovoltaic air conditioner 100, it is judged whether the photovoltaic air conditioner 100 meets photovoltaic power generation. When the actual power of the photovoltaic module 200 is greater than or equal to the maximum power of the photovoltaic air conditioner 100, it is determined that the photovoltaic air conditioner 100 meets photovoltaic power generation; Air conditioner 100 does not meet photovoltaic power generation.

It should be noted that before judging whether the photovoltaic air conditioner 100 satisfies photovoltaic power generation, the photovoltaic air conditioner 100 needs to perform a self-test, etc., which is not limited in this disclosure.

S200: Determine the working state of the photovoltaic air conditioner 100.

In the above steps, the working state of the photovoltaic air conditioner 100 can be determined according to the instruction information. The instruction information is output by the instruction input device according to the user's operation instruction. The operation instruction includes at least one of the air supply state, standby state, cooling state, heating state and set temperature, and the instruction information includes controlling the start, stop and operation of the first compressor 10 and/or the second compressor 11 Frequency command information.

For example, when the photovoltaic air conditioner 100 meets photovoltaic power generation requirements, the user inputs the air supply state or the standby state, and the main control board 40 receives the instruction information for controlling the stop of the first compressor 10, and executes S300; In the case of 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 executes S400.

S300: Control the first inverter device 20 to convert the DC power from the photovoltaic module 200 into AC power, and control the first switch circuit 30 to conduct the first inverter device 20 with the grid 300 .

At this time, as shown in FIG. 1 and FIG. 2 , the AC power converted by the first inverter device 20 can be output to the grid 300 , that is, the electric energy converted by the photovoltaic module 200 can be input into the grid 300 to improve energy utilization and obtain income.

S400: Control the first inverter device 20 to convert the DC power from the photovoltaic module 200 into AC power, and control the first switch circuit 30 to connect the first inverter device 20 to the first compressor 10 .

At this time, as shown in Figures 1 and 2, the AC power converted by the first inverter device 20 can be output to the first compressor 10, that is, the electric energy converted by the photovoltaic module 200 can drive the first compressor 10, thereby realizing refrigeration or refrigeration. heat, reducing operating costs.

Referring to FIG. 3 and FIG. 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 above control method further includes S500.

When the photovoltaic air conditioner 100 does not satisfy photovoltaic power generation, and the user inputs a cooling state or a heating state, S500 may be executed.

S500: Control the first switch circuit 30 to connect the first inverter device 20 to the power grid 300, control the first inverter device 20 to convert the alternating current from the power grid 300 into direct current, and control the second inverter device 21 to convert the The DC power converted by the transformer 20 is converted into AC power, and the AC power is transmitted to the second compressor 11 .

At this time, referring to Fig. 3 and Fig. 4, when the solar energy cannot be converted into electrical energy through the photovoltaic module 200 and provided to the photovoltaic air conditioner 100, for example, at night or on cloudy days, the photovoltaic air conditioner 100 can also be connected to the grid 300, Electric energy is provided by the grid 300 to drive the second compressor 11 to realize cooling or heating and ensure the normal use of the photovoltaic air conditioner 100 .

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

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

S600: Determine whether the first compressor 10 and the second compressor 11 need to work.

Wherein, when the first compressor 10 does not need to work, S700 is executed. When the first compressor 10 needs to work and the second compressor 11 does not need to work, the above S400 is executed again, 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 work, S800 is executed.

S700: Control the first inverter device 20 to convert the direct current from the photovoltaic module 200 into alternating current, and control the first switch circuit 30 to conduct the first inverter device 20 with the grid 300; The DC power of the assembly 200 is converted into AC power, and the AC power is transmitted to the second compressor 11 .

At this time, while the photovoltaic air conditioner 100 utilizes the electric energy of the photovoltaic module 200 to realize cooling or heating functions, it can also input excess electric energy into the grid 300 to obtain income.

S800: Control the first inverter device 20 to convert the direct current from the photovoltaic module 200 into alternating current, and control the first switch circuit 30 to conduct the first inverter device 20 with the first compressor 10; control the second inverter device 21 The DC power from the photovoltaic module 200 is converted into AC power, and the AC power is transmitted to the second compressor 11 .

At this time, the cooling efficiency of the photovoltaic air conditioner 100 is relatively high, and the power grid 300 is not required to provide electric energy, thereby saving costs.

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

Under the condition that the photovoltaic air conditioner 100 does not satisfy photovoltaic power generation and the photovoltaic air conditioner 100 is in a cooling or heating state, S600 may be executed before S500 is executed. At this time, when both the first compressor 10 and the second compressor 11 need to work, execute S900; when only one compressor needs to be started, the second compressor 11 can be selected to be started, that is, execute S500. During the execution of S500, the second inverter device 21 may convert and transmit the DC power converted by the first inverter device 20 to the second compressor 11, or convert and transmit the DC power from the rectifier 50 to the second compressor 11. Machine 11.

S900: Control the first switch circuit 30 to connect the first inverter device 20 to the first compressor 10, control the first inverter device 20 to convert the DC power from the rectifier 50 into AC power, and transmit the AC power to the first compressor 10; and, control the second inverter device 21 to convert the DC power from the rectifier 50 into AC power, and transmit the AC power to the second compressor 11 .

At this time, when the solar energy cannot be converted into electrical energy through the photovoltaic module 200 and provided to the photovoltaic air conditioner 100, the photovoltaic air conditioner 100 can also be connected to the grid 300, and the grid 300 provides electrical energy to drive the first compressor 10 and The second compressor 11, so as to realize high-efficiency cooling or heating.

In yet another aspect, an embodiment of the present disclosure further provides a photovoltaic air conditioner system 1000. Referring to FIG. 1 , the photovoltaic air conditioner system 1000 includes the photovoltaic air conditioner 100 and the photovoltaic module 200 described in any of the above embodiments. The photovoltaic assembly 200 is coupled with the photovoltaic air conditioner 100 , and the photovoltaic assembly 200 is used to convert solar energy into electrical energy and transmit the electrical energy to the photovoltaic air conditioner 100 .

The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the protection scope described in the claims.

Claims

A photovoltaic air conditioner, comprising:

first compressor;

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

A first switch circuit, coupled to the first inverter device and the first compressor; the first switch circuit is configured to connect the first inverter device to the power grid or the first compressor Pass;

a main control board, coupled to the first switch circuit and the first inverter device; the main control board is configured to,

When the photovoltaic power generation is satisfied and the photovoltaic air conditioner is in the air supply state or the standby state, control the first inverter device to convert the direct current from the photovoltaic module into alternating current, and control the first switch circuit to The first inverter device is connected to the grid, so that the alternating current converted by the first inverter device is output to the grid;

When the photovoltaic power generation is satisfied and the photovoltaic air conditioner is in a cooling state or a heating state, control the first inverter device to convert the direct current from the photovoltaic module into alternating current, and control the first switch circuit to The first inverter device is connected to 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 according to claim 1, the first inverter device is further configured to convert alternating current from the power grid into direct current; the photovoltaic air conditioner further comprises:

at least one second compressor;

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

The main control board is also coupled to the second inverter device; the main control board is also configured to:

Under the condition that photovoltaic power generation is not satisfied and the photovoltaic air conditioner is in a cooling state or a heating state, control the first switch circuit to conduct the first inverter device with the power grid, and control the first inverter The inverter converts the alternating current from the grid into direct current, controls the second inverter to convert the direct current converted from the first inverter into alternating current, and transmits the alternating current to the second compressor.
According to the photovoltaic air conditioner according to claim 2, the main control board is further configured to satisfy photovoltaic power generation and the photovoltaic air conditioner is in a cooling state or a heating state;

When the first compressor does not need to work, control the first inverter device to convert the direct current from the photovoltaic module into alternating current, and control the first switch circuit to connect the first inverter device with the The power grid is turned on, so that the alternating current converted by the first inverter device is output to the grid; and, the second inverter device is controlled to convert the direct current from the photovoltaic module into alternating current, and transmit the alternating current to the second compressor.
According to the photovoltaic air conditioner according to claim 3, the main control board is further configured to satisfy photovoltaic power generation and the photovoltaic air conditioner is in a cooling state or a heating state;

When both the first compressor and the second compressor need to work, control the first inverter device to convert the direct current from the photovoltaic module into alternating current, and control the first switch circuit to convert the The first inverter device is connected to the first compressor, so that the alternating current converted by the first inverter device is output to the first compressor; The direct current of the photovoltaic module is converted into alternating current, and the alternating current is transmitted to the second compressor.
The photovoltaic air conditioner according to 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 configured to convert the AC power of the grid into DC power and transmit it to the the first inverter device and/or the second inverter device;

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

The second inverter device is further configured to convert the DC power from the rectifier into AC power and transmit the AC power to the second compressor;

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

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

When the photovoltaic air conditioner satisfies photovoltaic power generation, determine the working state of the photovoltaic air conditioner according to the instruction information;

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

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

In the case that the photovoltaic air conditioner does not satisfy photovoltaic power generation, determine the working state of the photovoltaic air conditioner according to the instruction information;

When the photovoltaic air conditioner is in cooling state or heating state, control the first switch circuit to conduct the first inverter device with the grid, and control the first inverter device to The alternating current is converted into direct current, and the second inverter device is controlled to convert the direct current converted from the first inverter device into alternating current, and transmit the alternating current to the second compressor.
According to the control method of the photovoltaic air conditioner according to claim 8, in the process of determining the working state of the photovoltaic air conditioner according to the instruction information, it is also determined whether the first compressor and the second compressor need to work; The control method also includes:

When the photovoltaic air conditioner satisfies photovoltaic power generation, and when the photovoltaic air conditioner is in a cooling state or a heating state;

When the first compressor does not need to work, control the first inverter device to convert the direct current from the photovoltaic module into alternating current, and control the first switch circuit to connect the first inverter device with the The power grid is turned on, so that the alternating current converted by the first inverter device is output to the grid; and, the second inverter device is controlled to convert the direct current from the photovoltaic module into alternating current, and transmit the alternating current to the second compressor.
The control method of the photovoltaic air conditioner according to claim 9, further comprising: when the photovoltaic air conditioner satisfies photovoltaic power generation, and when the photovoltaic air conditioner is in a cooling state or a heating state;

When both the first compressor and the second compressor need to work, control the first inverter device to convert the direct current from the photovoltaic module into alternating current, and control the first switch circuit to convert the The first inverter device is connected to the first compressor, so that the alternating current converted by the first inverter device is output to the first compressor; The direct current of the photovoltaic module is converted into alternating current, and the alternating current is transmitted to the second compressor.
According to the control method of the photovoltaic air conditioner according to claim 9, the photovoltaic air conditioner further comprises at least one rectifier, and the control method further comprises:

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

When both the first compressor and the second compressor need to work, control the first switch circuit to conduct the first inverter device with the first compressor, and control the first inverter converting the direct current from the rectifier into alternating current, and transmitting the alternating current to the first compressor; and controlling the second inverter to convert the direct current from the rectifier into alternating current, and The alternating current is transmitted to the second compressor.
A photovoltaic air conditioning system, comprising:

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

The photovoltaic component is coupled with the photovoltaic air conditioner; the photovoltaic component is used to convert solar energy into electrical energy and transmit the electrical energy to the photovoltaic air conditioner.