Integrated system based on air energy heat pump and photovoltaic power generation

Abstract

The utility model provides an integrated system based on an air energy heat pump and photovoltaic power generation, which comprises an air energy heat pump system, an LLC (logical link control) resonance DCDC (direct current-direct current) isolation transformation system and a power generation device, the output end of the LLC resonance DCDC isolation transformation system is connected with the air energy heat pump system through a direct current bus, and the input end of the LLC resonance DCDC isolation transformation system is connected with the power generation device. The LLC resonance DCDC isolation conversion system is used for isolating the output voltage of the power generation device from the bus voltage of the DC bus, and completing boosting of the output voltage at the DC bus side; and the power generation device is used for providing supplementary electric energy for the air energy heat pump system. Through the system, the energy cycle topological structure is optimized, and the energy utilization rate is improved.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaic power generation technology, and specifically relates to an integrated system based on air energy heat pump and photovoltaic power generation. Background Art

[0002] Solar photovoltaic power generation, as a green and renewable energy source, is gaining more and more attention. In the past, photovoltaic power generation technology inverted the direct current generated by photovoltaic power generation and connected it to the alternating current grid, thus realizing the long-distance transmission of electric energy.

[0003] However, the existing energy cycle topology of photovoltaic grid-connected power generation is unreasonable, and the energy utilization rate of photovoltaic power generation is low. Utility Model Content

[0004] In order to solve the above problems in the prior art, the present application provides an integrated system based on air energy heat pump and photovoltaic power generation.

[0005] In a first aspect, the present application provides an integrated system based on air energy heat pump and photovoltaic power generation, the system comprising: an air energy heat pump system, an LLC resonant DCDC isolation conversion system and a power generation device, wherein:

[0006] The input end of the air energy heat pump system is connected to the single-phase AC access end of the household power grid, the output end of the LLC resonant DCDC isolation conversion system is connected to the air energy heat pump system through a DC bus, and the input end is connected to the power generation device;

[0007] The LLC resonant DCDC isolation conversion system is used to isolate the output voltage of the power generation device from the bus voltage of the DC bus, and at the same time complete the boosting of the output voltage on the DC bus side;

[0008] The power generation device is used to provide supplementary electric energy to the air energy heat pump system.

[0009] In a possible implementation, the LLC resonant DCDC isolation conversion system includes one or more LLC resonant DCDC isolation converters connected in parallel, and the input end of each LLC resonant DCDC isolation converter is connected to a single power generation device, wherein the number of the LLC resonant DCDC isolation converters is the same as the number of the power generation devices.

[0010] In a possible implementation, the power generation device includes one or more power generation components connected in parallel, wherein the power generation component is a photovoltaic power generation component.

[0011] In a possible implementation, the LLC resonant DCDC isolation converter includes: a support module, a switch module, a rectifier module and a resonant module, wherein:

[0012] The support module is used to protect the stable operation of the LLC resonant DCDC isolation converter, the switch module is used to convert the output voltage generated by the power generation device into a square wave voltage, and apply the square wave voltage to the resonance module, the resonance module is used to generate a high-frequency resonant voltage under the square wave voltage, and the rectifier module is used to convert the high-frequency resonant voltage into a high DC output voltage.

[0013] In a possible implementation, the support module includes an input protection unit, wherein:

[0014] The input protection unit comprises a supporting resistor (1) and a film capacitor (2) connected in parallel, the input end of the input protection unit is connected to the power generation device, and the output end of the input protection unit is connected to the rectifier module.

[0015] In a possible implementation, the support module further includes an output protection unit, wherein:

[0016] The output protection unit comprises a supporting resistor (14) and a film capacitor (15) connected in parallel, the input end of the output protection unit is connected to the rectifier module, and the output end of the output protection unit is connected to the air energy heat pump system.

[0017] In a possible implementation, the switch module comprises a silicon carbide MOS tube (3), a silicon carbide MOS tube (4), a silicon carbide MOS tube (5) and a silicon carbide MOS tube (6); the S pole of the silicon carbide MOS tube (3) is connected to the D pole of the silicon carbide MOS tube (4); the S pole of the silicon carbide MOS tube (5) is connected to the D pole of the silicon carbide MOS tube (6); the D pole of the silicon carbide MOS tube (3) and the D pole of the silicon carbide MOS tube (5) are connected via a first intersection; and the S pole of the silicon carbide MOS tube (4) and the S pole of the silicon carbide MOS tube (6) are connected via a second intersection.

[0018] In a possible implementation, the rectifier module comprises a SIC diode (10), a SIC diode (11), a SIC diode (12) and a SIC diode (13), wherein:

[0019] The cathode of the SIC diode (10) and the cathode of the SIC diode (12) are connected via a third intersection, and the anode of the SIC diode (11) and the anode of the SIC diode (13) are connected via a fourth intersection;

[0020] The anode of the SIC diode (10) is connected to the cathode of the SIC diode (11), and the anode of the SIC diode (12) is connected to the cathode of the SIC diode (13).

[0021] In a possible implementation, the resonance module comprises a resonance capacitor (7), a transformer (8) and a resonance inductor (9), wherein:

[0022] The resonant capacitor (7) is connected to pin 1 of the primary winding of the transformer (8), pin 2 of the primary winding of the transformer (8) is connected between the silicon carbide MOS tube (5) and the silicon carbide MOS tube (6), and one end of the resonant capacitor (7) is connected between the silicon carbide MOS tube (3) and the silicon carbide MOS tube (4);

[0023] Pin 4 of the secondary winding of the transformer (8) is connected between the SIC diode (12) and the SIC diode (13) via the resonant inductor (9), and pin 3 of the secondary winding of the transformer (8) is connected between the SIC diode (10) and the SIC diode (11).

[0024] In a possible implementation, the air energy heat pump system includes a unidirectional PFC circuit, a first DSP controller, a heat pump drive circuit, a first embedded controller and a compressor, wherein:

[0025] The input end of the unidirectional PFC circuit is connected to the AC access end, the output end is connected to the input end of the heat pump drive circuit through a DC bus, and the output end of the heat pump drive circuit is connected to the compressor;

[0026] The first DSP controller is electrically connected to the unidirectional PFC circuit and the heat pump drive circuit. At the same time, the first DSP controller, the first embedded controller and the LLC resonant DCDC isolation conversion system are connected through a 485 bus, and the output end of the LLC resonant DCDC isolation conversion system is connected to the DC bus.

[0027] The present application provides an integrated system based on air energy heat pump and photovoltaic power generation. The output voltage provided by the power generation device is increased to the high DC output voltage required by the air energy heat pump system through the LLC resonant DCDC isolation conversion system, so as to provide the air energy heat pump system with heating indoor air. Through the above system, the LLC resonant DCDC isolation conversion system completes energy change on the bus side, optimizes the energy cycle topology, and improves energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1A schematic diagram of the structure of an integrated system based on air-energy heat pump and photovoltaic power generation provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the connection between an LLC resonant DCDC isolation conversion system and a power generation device provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the structure of a power generation device provided in an embodiment of the present application;

[0032] Figure 4 A circuit diagram of an LLC resonant DCDC isolation converter provided in an embodiment of the present application;

[0033] Figure 5 A schematic structural diagram of an air energy heat pump system provided in an embodiment of the present application.

[0034] Explanation of the numbers in the figure: 1-support resistor, 2-film capacitor, 3-silicon carbide MOS tube, 4-silicon carbide MOS tube, 5-silicon carbide MOS tube, 6-silicon carbide MOS tube, 7-resonant capacitor, 8-transformer, 9-resonant inductor, 10-SIC diode, 11-SIC diode, 12-SIC diode, 13-SIC diode, 14-support resistor, 15-film capacitor.

[0035] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here.

[0038] In the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0039] Solar photovoltaic power generation, as a green renewable energy source, is gaining more and more attention. In the past, photovoltaic power generation technology inverted the DC power generated by photovoltaics and connected it to the AC power grid, thus realizing the long-distance transmission of electric energy. However, the energy circulation topology structure of the existing photovoltaic grid-connected power generation is unreasonable, and the energy utilization rate of photovoltaic power generation is low.

[0040] The present application provides an integrated system based on air energy heat pump and photovoltaic power generation. The output voltage provided by the power generation device is increased to the high DC output voltage required by the air energy heat pump system through the LLC resonant DCDC isolation conversion system, so as to provide the air energy heat pump system with heating indoor air. Through the above system, the LLC resonant DCDC isolation conversion system completes energy change on the bus side, optimizes the energy cycle topology, and improves energy utilization.

[0041] Next, the technical solution shown in the present application is described in detail through specific embodiments. It should be noted that the following embodiments can exist independently or in combination with each other, and the same or similar contents will not be described repeatedly in different embodiments.

[0042] Figure 1 This is a schematic diagram of the structure of an integrated system based on air energy heat pump and photovoltaic power generation provided in an embodiment of the present application. Figure 1 As shown, the system includes: an air energy heat pump system, an LLC resonant DCDC isolation conversion system and a power generation device, wherein:

[0043] The input end of the air energy heat pump system is connected to the single-phase AC access end of the household power grid, the output end of the LLC resonant DCDC isolation conversion system is connected to the air energy heat pump system through a DC bus, and the input end is connected to the power generation device;

[0044] The air energy heat pump system is used to convert indoor low-temperature heat energy into high-temperature heat energy through the heat pump cycle principle to increase the indoor temperature;

[0045] The LLC resonant DCDC isolation conversion system is used to isolate the output voltage of the power generation device from the bus voltage of the DC bus, and at the same time complete the boosting of the output voltage on the DC bus side;

[0046] The power generation device is used to provide supplementary electric energy to the air energy heat pump system.

[0047] Since most integrated systems of air-source heat pumps and photovoltaic power generation are suitable for high-voltage environments, when the air-source heat pump system is running during the day, the electric energy generated by the power generation device needs to be directly provided to the air-source heat pump system. When the air-source heat pump system is not running, the electricity needs to be inverted back to the power grid. Considering that some air-source heat pump systems will also be used in low-voltage environments such as household voltage, this embodiment is aimed at low-voltage environments.

[0048] Specifically, the input end of the air energy heat pump system is connected to the single-phase AC access end of the household power grid, and the output voltage generated by the power generation device is isolated and transformed by the LLC resonant DCDC isolation conversion system, and then directly output to the air energy heat pump system. Since this embodiment is used in a low voltage environment, the high DC output voltage obtained by the LLC resonant DCDC isolation conversion system is still in a relatively low range, so when the air energy heat pump system is not running, there is no need to invert the high DC output voltage back to the grid.

[0049] Furthermore, the system optimizes the energy circulation topology of the integrated system of air energy heat pump and photovoltaic power generation, and the energy is directly changed on the DC bus side, thereby improving energy utilization.

[0050] It should be noted that this embodiment is directed to photovoltaic power generation technology, and the power generation device in this embodiment and subsequent power generation devices are all photovoltaic power generation devices composed of photovoltaic modules.

[0051] The present application provides an integrated system based on air energy heat pump and photovoltaic power generation. The output voltage provided by the power generation device is increased to the high DC output voltage required by the air energy heat pump system through the LLC resonant DCDC isolation conversion system, so as to provide the air energy heat pump system with heating indoor air. Through the above system, the LLC resonant DCDC isolation conversion system completes energy change on the bus side, optimizes the energy cycle topology, and improves energy utilization.

[0052] Figure 2 A schematic diagram of the connection between an LLC resonant DCDC isolation conversion system and a power generation device provided in an embodiment of the present application. Figure 2 As shown, the LLC resonant DCDC isolation conversion system comprises:

[0053] One or more LLC resonant DCDC isolation converters are connected in parallel, and the input end of each LLC resonant DCDC isolation converter is connected to a single power generation device, wherein the number of the LLC resonant DCDC isolation converters is the same as the number of the power generation devices.

[0054] Since the system is suitable for low voltage environment, the output voltage of the power generation device for providing supplementary electric energy to the air energy heat pump system must not be too high. Therefore, the present embodiment requires that the power generation device be incorporated into the system in a single form.

[0055] Furthermore, since the electric energy required by the air-to-energy heat pump system is different, in order to ensure that the output voltage provided by the power generation device can ensure the normal operation of the air-to-energy heat pump system after being converted by the LLC resonant DCDC isolation conversion system, the power generation components constituting the power generation device can be connected in parallel and then connected to the system, thereby ensuring that the air-to-energy heat pump system can operate stably and avoiding excessive output voltage provided by the power generation device.

[0056] For example, Figure 3 As shown, the power generation device is specifically: the power generation device includes one or more power generation components connected in parallel, wherein the power generation component is a photovoltaic power generation component.

[0057] In order to enable the power generation device to be incorporated into the system in a single form, the LLC resonant DCDC isolation conversion system of this embodiment adopts an LLC resonant DCDC isolation converter. Similarly, in order to ensure the stable operation of the air energy heat pump system, the LLC resonant DCDC isolation conversion system is designed as a single-module LLC resonant DCDC isolation converter or a multi-module LLC resonant DCDC isolation converter in parallel, and each LLC resonant DCDC isolation converter is linked to a single power generation device. A single power generation device is a single or multiple power generation components connected in parallel.

[0058] Furthermore, if the LLC resonant DCDC isolation conversion system is a multi-module LLC resonant DCDC isolation converter in parallel, the number of LLC resonant DCDC isolation converters is obtained according to the requirements of the air energy heat pump system. At the same time, because each LLC resonant DCDC isolation converter needs to be connected to a power generation device, the number of LLC resonant DCDC isolation converters is the same as the number of power generation devices.

[0059] The present application provides an integrated system based on air energy heat pump and photovoltaic power generation, wherein a single or multiple LLC resonant DCDC isolation converters connected in parallel constitute an LLC resonant DCDC isolation conversion system, and each LLC resonant DCDC isolation converter is connected to a single power generation device. Through the above system, the present system can be applied to a low voltage environment while ensuring the stable operation of the air energy heat pump system, and effectively isolating the output voltage of the power generation device and the DC bus voltage, thereby achieving an anti-islanding effect.

[0060] Figure 4 A circuit diagram of an LLC resonant DCDC isolation converter provided in an embodiment of the present application. Figure 4As shown, the LLC resonant DCDC isolation converter includes a support module, a switch module, a rectifier module and a resonant module, wherein:

[0061] The support module is used to protect the stable operation of the LLC resonant DCDC isolation converter, the switch module is used to convert the output voltage generated by the power generation device into a square wave voltage, and apply the square wave voltage to the resonance module, the resonance module is used to generate a high-frequency resonant voltage under the square wave voltage, and the rectifier module is used to convert the high-frequency resonant voltage into a high DC output voltage.

[0062] Specifically, the support module includes an input protection unit and an output protection unit, wherein:

[0063] The input protection unit comprises a supporting resistor 1 and a film capacitor 2 connected in parallel, the input end of the input protection unit is connected to the power generation device, and the output end of the input protection unit is connected to the rectifier module;

[0064] The output protection unit comprises a supporting resistor 14 and a film capacitor 15 connected in parallel. The input end of the output protection unit is connected to the rectifier module, and the output end of the output protection unit is connected to the air energy heat pump system.

[0065] The switch module comprises a silicon carbide MOS tube 3, a silicon carbide MOS tube 4, a silicon carbide MOS tube 5 and a silicon carbide MOS tube 6, the S pole of the silicon carbide MOS tube 3 is connected to the D pole of the silicon carbide MOS tube 4, the S pole of the silicon carbide MOS tube 5 is connected to the D pole of the silicon carbide MOS tube 6, the D pole of the silicon carbide MOS tube 3 and the D pole of the silicon carbide MOS tube 5 are connected through a first intersection, and the S pole of the silicon carbide MOS tube 4 and the S pole of the silicon carbide MOS tube 6 are connected through a second intersection.

[0066] The rectifier module comprises a SIC diode 10, a SIC diode 11, a SIC diode 12 and a SIC diode 13, wherein:

[0067] The cathode of the SIC diode 10 and the cathode of the SIC diode 12 are connected via a third intersection, and the anode of the SIC diode 11 and the anode of the SIC diode 13 are connected via a fourth intersection;

[0068] The anode of the SIC diode 10 is connected to the cathode of the SIC diode 11 , and the anode of the SIC diode 12 is connected to the cathode of the SIC diode 13 .

[0069] The resonance module comprises a resonance capacitor 7, a transformer 8 and a resonance inductor 9, wherein:

[0070] The resonant capacitor 7 is connected to pin 1 of the primary winding of the transformer 8, pin 2 of the primary winding of the transformer 8 is connected between the silicon carbide MOS tube 5 and the silicon carbide MOS tube 6, and one end of the resonant capacitor 7 is connected between the silicon carbide MOS tube 3 and the silicon carbide MOS tube 4;

[0071] Pin 4 of the secondary winding of the transformer 8 is connected between the SIC diode 12 and the SIC diode 13 through the resonant inductor 9 , and pin 3 of the secondary winding of the transformer 8 is connected between the SIC diode 10 and the SIC diode 1 .

[0072] In this embodiment, the topological circuit composed of four modules of the LLC resonant DCDC isolation converter is a resonant circuit that achieves a constant output voltage by controlling the switching frequency. It should be noted that the MOS tube of a similar topological circuit in the past is a hard switch, that is, the silicon carbide MOS tube in this embodiment will be replaced by a MOS tube in the future. Due to the hard switching of the MOS tube, the voltage and current of the MOS tube will overlap when it is turned on and off, and the overlapping area is the conduction loss and turn-off loss of the MOS tube. In order to reduce the conduction loss and turn-off loss of the MOS tube and improve the efficiency of the power generation device, this embodiment implements MOS tube soft switching through zero voltage switching ZVS.

[0073] Specifically, ZVS means that the voltage of the MOS tube is reduced to zero before being turned on and remains at zero when being turned off.

[0074] Furthermore, when a square wave voltage is generated by the switch module and applied to the resonance module, the resonance module resonates and generates a high-frequency resonance voltage. The resonance module circulates current, so the energy in the resonance module circulates and is transmitted through the transformer 8, that is, after the primary winding of the transformer 8 receives the bipolar square wave voltage, the voltage is transmitted to the secondary winding side of the transformer 8. It should be noted that the turns ratio of the primary winding and the secondary winding of the transformer 8 is determined according to the needs of the air energy heat pump system. At the same time, the output voltage of the power generation device and the DC bus voltage are isolated by the transformer 8.

[0075] Considering the cost reduction, different from the conventional resonant module, the present embodiment sets the resonant inductor 9 in the secondary winding of the transformer 8. Since the secondary winding side is in a high voltage and low current state, the size of the resonant inductor 9 can be reduced.

[0076] The high-frequency resonant voltage generated by the resonant module passes through the rectifier module to convert the high-frequency resonant voltage into a high DC output voltage, which will subsequently act on the air energy heat pump system.

[0077] Furthermore, in order to further ensure that the voltage output to the air energy heat pump system is a DC voltage, after the rectifier module generates a high DC output voltage, a filtering operation is performed through the output protection unit.

[0078] The present application provides an integrated system based on air-energy heat pump and photovoltaic power generation. The switch module converts the input voltage after filtering by the input protection unit into a square wave voltage. The square wave voltage generates a high-frequency resonant voltage through the resonance module, and then converts it into a high DC voltage through the rectifier module. After filtering by the output protection unit, it is output to the air-energy heat pump system. Through the above system, the output voltage generated by the power generation device is increased to the required value, and the output voltage of the power generation device and the DC bus voltage are isolated, which further protects the safety of the system. At the same time, the switch module can realize ZVS in the resonant state, thereby improving the efficiency of the power generation device.

[0079] Figure 5 This is a schematic diagram of the structure of an air energy heat pump system provided in an embodiment of the present application. Figure 5 As shown, the air energy heat pump system includes: a unidirectional PFC circuit, a first DSP controller, a heat pump drive circuit, a first embedded controller and a compressor, wherein:

[0080] The input end of the unidirectional PFC circuit is connected to the AC access end, the output end is connected to the input end of the heat pump drive circuit through a DC bus, and the output end of the heat pump drive circuit is connected to the compressor;

[0081] The first DSP controller is electrically connected to the unidirectional PFC circuit and the heat pump drive circuit. At the same time, the first DSP controller, the first embedded controller and the LLC resonant DCDC isolation conversion system are connected through a 485 bus, and the output end of the LLC resonant DCDC isolation conversion system is connected to the DC bus.

[0082] In this embodiment, the unidirectional PFC (Power Factor Correction) circuit is a power factor correction circuit, which is used to change the voltage and power input at the single-phase AC access end of the household power grid, so that its power factor is close to 1, thereby improving the energy efficiency of the system. This embodiment does not impose any restrictions on the type of unidirectional PFC circuit, which can be selected according to actual conditions. Exemplarily, the unidirectional PFC circuit type can be a full-bridge type, a transformer type, etc.

[0083] In a possible implementation, the first embedded controller is the master control unit of the system, includes a 7-inch LCD touch screen for realizing human-computer interaction, and is connected to the first DSP controller and the LLC resonant DCDC isolation conversion system via a 485 bus.

[0084] In another possible implementation manner, the model of the first DSP controller may be TMS320F280039.

[0085] The present application provides an integrated system based on air energy heat pump and photovoltaic power generation, wherein the input end of the unidirectional PFC circuit is connected to the AC access end, the output end is connected to the heat pump drive circuit through the DC bus and then connected to the compressor, and at the same time, the output end of the LLC resonant DCDC isolation conversion system is connected to the DC bus, and the first DSP controller, the first embedded controller and the LLC resonant DCDC isolation conversion system are connected through a 485 bus. Through the above system, the LLC resonant DCDC isolation conversion system completes energy changes on the bus side, optimizes the energy cycle topology, and improves energy utilization.

[0086] It should be understood that the above-mentioned device embodiments are only illustrative, and the device of the present application can also be implemented in other ways. For example, the division of units / modules in the above-mentioned embodiments is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units, modules or components can be combined, or can be integrated into another system, or some features can be ignored or not executed.

[0087] In addition, unless otherwise specified, each functional unit / module in each embodiment of the present application may be integrated into one unit / module, each unit / module may exist physically separately, or two or more units / modules may be integrated together. The above-mentioned integrated unit / module may be implemented in the form of hardware or in the form of a software program module.

[0088] If the integrated unit / module is implemented in the form of hardware, the hardware may be a digital circuit, an analog circuit, etc. The physical implementation of the hardware structure includes but is not limited to transistors, memristors, etc. If not specifically stated, the processor may be any appropriate hardware processor, such as a CPU, a GPU, an FPGA, a DSP, an ASIC, etc. If not specifically stated, the storage unit may be any appropriate magnetic storage medium or magneto-optical storage medium, such as a resistive random access memory RRAM (Resistive Random Access Memory), a dynamic random access memory DRAM (Dynamic Random Access Memory), a static random access memory SRAM (Static Random-Access Memory), an enhanced dynamic random access memory EDRAM (Enhanced Dynamic Random Access Memory), a high-bandwidth memory HBM (High-Bandwidth Memory), a hybrid memory cube HMC (Hybrid Memory Cube), etc.

[0089] If the integrated unit / module is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned memory includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0090] In the above embodiments, the description of each embodiment has its own emphasis. For the part not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0092] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments, and the above embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An integrated system based on air energy heat pump and photovoltaic power generation, characterized in that: The system comprises: an air energy heat pump system, an LLC resonant DCDC isolation conversion system and a power generation device, wherein: The input end of the air energy heat pump system is connected to the single-phase AC access end of the household power grid, the output end of the LLC resonant DCDC isolation conversion system is connected to the air energy heat pump system through a DC bus, and the input end is connected to the power generation device; The LLC resonant DCDC isolation conversion system is used to isolate the output voltage of the power generation device from the bus voltage of the DC bus, and at the same time complete the boosting of the output voltage on the DC bus side; The power generation device is used to provide supplementary electric energy to the air energy heat pump system.

2. The system according to claim 1, characterized in that The LLC resonant DCDC isolation conversion system includes one or more LLC resonant DCDC isolation converters connected in parallel, and the input end of each LLC resonant DCDC isolation converter is connected to a single power generation device, wherein the number of the LLC resonant DCDC isolation converters is the same as the number of the power generation devices.

3. The system according to claim 2, characterized in that The power generation device comprises one or more power generation components connected in parallel, wherein the power generation component is a photovoltaic power generation component.

4. The system according to claim 3, characterized in that The LLC resonant DCDC isolation converter comprises: a support module, a switch module, a rectifier module and a resonant module, wherein: The support module is used to protect the stable operation of the LLC resonant DCDC isolation converter, the switch module is used to convert the output voltage generated by the power generation device into a square wave voltage, and apply the square wave voltage to the resonance module, the resonance module is used to generate a high-frequency resonant voltage under the square wave voltage, and the rectifier module is used to convert the high-frequency resonant voltage into a high DC output voltage.

5. The system according to claim 4, characterized in that The support module comprises an input protection unit, wherein: The input protection unit comprises a supporting resistor (1) and a film capacitor (2) connected in parallel, the input end of the input protection unit is connected to the power generation device, and the output end of the input protection unit is connected to the rectifier module.

6. The system according to claim 5, characterized in that The support module further comprises an output protection unit, wherein: The output protection unit comprises a supporting resistor (14) and a film capacitor (15) connected in parallel, the input end of the output protection unit is connected to the rectifier module, and the output end of the output protection unit is connected to the air energy heat pump system.

7. The system according to claim 6, characterized in that The switch module comprises a silicon carbide MOS tube (3), a silicon carbide MOS tube (4), a silicon carbide MOS tube (5) and a silicon carbide MOS tube (6); the S pole of the silicon carbide MOS tube (3) is connected to the D pole of the silicon carbide MOS tube (4); the S pole of the silicon carbide MOS tube (5) is connected to the D pole of the silicon carbide MOS tube (6); the D pole of the silicon carbide MOS tube (3) and the D pole of the silicon carbide MOS tube (5) are connected via a first intersection; and the S pole of the silicon carbide MOS tube (4) and the S pole of the silicon carbide MOS tube (6) are connected via a second intersection.

8. The system according to claim 7, characterized in that The rectifier module comprises a SIC diode (10), a SIC diode (11), a SIC diode (12) and a SIC diode (13), wherein: The cathode of the SIC diode (10) and the cathode of the SIC diode (12) are connected via a third intersection, and the anode of the SIC diode (11) and the anode of the SIC diode (13) are connected via a fourth intersection; The anode of the SIC diode (10) is connected to the cathode of the SIC diode (11), and the anode of the SIC diode (12) is connected to the cathode of the SIC diode (13).

9. The system according to claim 8, characterized in that The resonance module comprises a resonance capacitor (7), a transformer (8) and a resonance inductor (9), wherein: The resonant capacitor (7) is connected to pin 1 of the primary winding of the transformer (8), pin 2 of the primary winding of the transformer (8) is connected between the silicon carbide MOS tube (5) and the silicon carbide MOS tube (6), and one end of the resonant capacitor (7) is connected between the silicon carbide MOS tube (3) and the silicon carbide MOS tube (4); Pin 4 of the secondary winding of the transformer (8) is connected between the SIC diode (12) and the SIC diode (13) via the resonant inductor (9), and pin 3 of the secondary winding of the transformer (8) is connected between the SIC diode (10) and the SIC diode (11).

10. The system according to claim 9, characterized in that The air energy heat pump system comprises a unidirectional PFC circuit, a first DSP controller, a heat pump driving circuit, a first embedded controller and a compressor, wherein: The input end of the unidirectional PFC circuit is connected to the AC access end, the output end is connected to the input end of the heat pump drive circuit through a DC bus, and the output end of the heat pump drive circuit is connected to the compressor; The first DSP controller is electrically connected to the unidirectional PFC circuit and the heat pump drive circuit. At the same time, the first DSP controller, the first embedded controller and the LLC resonant DCDC isolation conversion system are connected through a 485 bus, and the output end of the LLC resonant DCDC isolation conversion system is connected to the DC bus.

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