Photovoltaic energy storage air conditioning system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
- Filing Date
- 2025-01-07
- Publication Date
- 2026-07-14
Smart Images
Figure CN122394014A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of air conditioning, specifically to the design of a photovoltaic energy storage air conditioning system. Background Technology
[0002] Air conditioners consume a lot of electricity during operation. In order to reduce reliance on non-renewable energy, photovoltaic air conditioning systems have emerged, which can convert solar energy into electricity using photovoltaic modules and supply the electricity to the air conditioner.
[0003] Existing photovoltaic air conditioning systems include photovoltaic modules, photovoltaic energy storage inverters, and photovoltaic air conditioners. The electrical energy generated by the photovoltaic modules can be stored in batteries through the photovoltaic energy storage inverter for use by the load, or it can be directly connected to the grid. However, because photovoltaic air conditioners use DC motors, they also need to go through an AC-DC module to convert AC power to DC power, which will cause energy loss during the conversion process.
[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention
[0005] In response to the problems pointed out in the background art, some embodiments of this application provide a photovoltaic energy storage air conditioning system, which, by adding an energy coupling device, omits the energy conversion of the AC-DC module and directly supplies DC power to the photovoltaic air conditioner.
[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In some embodiments of this application, a photovoltaic energy storage air conditioning system is provided, including: Photovoltaic modules; A photovoltaic energy storage inverter is connected to the photovoltaic module; An energy storage device is connected to the photovoltaic energy storage inverter; An energy coupling device is connected to the photovoltaic energy storage inverter, the energy storage device, and the photovoltaic air conditioner; The energy coupling device is configured to control the input power of the photovoltaic energy storage inverter grid port according to the remaining power of the energy storage device. The energy coupling device is also configured to control the emergency power function of the photovoltaic energy storage inverter.
[0007] This technical solution has the following beneficial effects or advantages: By adding the energy coupling device and connecting it to the bidirectional DC port of the photovoltaic energy storage inverter, the energy coupling device can also be connected to the voltage output port of the energy storage device. At the same time, the photovoltaic air conditioner is connected to the DC output port of the energy coupling device for power supply. Thus, the photovoltaic energy storage inverter can directly supply DC power to the photovoltaic air conditioner through the bidirectional DC-DC converter, effectively reducing the energy loss caused by power conversion, and can also charge the energy storage device.
[0008] To ensure the operating power of the photovoltaic air conditioner, the energy coupling device controls the power of the photovoltaic energy storage inverter for the emergency power function.
[0009] In some embodiments of this application, the remaining power of the energy storage device includes a first range, a second range, and a third range, wherein the remaining power in the first range is not less than the remaining power in the second range, and the remaining power in the second range is not less than the remaining power in the third range; when the remaining power of the energy storage device is in the first range, the energy coupling device is configured to: control the input power of the grid port of the photovoltaic energy storage inverter; and the grid port of the photovoltaic energy storage inverter is in a discharge state.
[0010] This technical solution has the following beneficial effects or advantages: When the remaining power of the energy storage device is within a first range, that is, when the remaining power of the energy storage device is relatively large and within the upper limit range, the energy coupling device not only limits the input power of the grid port of the photovoltaic energy storage inverter, but also ensures that the grid port of the photovoltaic energy storage inverter is in a discharging state. This allows for the reasonable configuration of the power of the photovoltaic energy storage inverter and guarantees the normal operation of the photovoltaic air conditioner.
[0011] In some embodiments of this application, when the remaining power of the energy storage device is within a second range, the energy coupling device is configured to control the input power of the grid port of the photovoltaic energy storage inverter.
[0012] This technical solution has the following beneficial effects or advantages: when the remaining power of the energy storage device is within the second range, that is, when the remaining power of the energy storage device is within the normal range, the energy coupling device only limits the power of the grid input port of the photovoltaic energy storage inverter, which can reasonably configure the power of the photovoltaic energy storage inverter and ensure the normal operation of the photovoltaic air conditioner.
[0013] In some embodiments of this application, when the remaining power of the energy storage device is in a third range, the energy coupling device is configured to control the photovoltaic energy storage inverter to charge the energy storage device.
[0014] This technical solution has the following beneficial effects or advantages: When the remaining power of the energy storage device is in the third range, that is, when the remaining power of the energy storage device is low and within the lower limit range, the energy coupling device no longer limits the power of the grid input port of the photovoltaic energy storage inverter, thereby ensuring the power supply of the photovoltaic module and the grid to the photovoltaic air conditioner; and enabling the photovoltaic module to charge the energy storage device, increasing the remaining power of the energy storage device to 40% of the battery capacity.
[0015] In some embodiments of this application, when the energy storage device is in a peak shaving and valley filling mode charging period and when the remaining power of the energy storage device is in a second range, the energy coupling device is configured to control the photovoltaic energy storage inverter to charge the energy storage device.
[0016] This technical solution has the following beneficial effects or advantages: During the charging period in peak shaving and valley filling mode, the photovoltaic energy storage inverter converts the AC power in the grid into DC power to charge the energy storage device. Therefore, when the remaining power of the energy storage device is within the second range, that is, when the remaining power of the energy storage device is within the normal range, the energy coupling device no longer limits the power of the grid input port of the photovoltaic energy storage inverter, thereby ensuring the power supply of the photovoltaic modules and the grid to the photovoltaic air conditioner, and enabling the photovoltaic modules to charge the energy storage device.
[0017] In some embodiments of this application, when the photovoltaic energy storage air conditioning system is off-grid, the energy coupling device is configured to adjust the operating mode of the photovoltaic energy storage inverter and the photovoltaic air conditioning according to the remaining power of the energy storage device.
[0018] This technical solution has the following beneficial effects or advantages: When the photovoltaic energy storage air conditioning system is off-grid, that is, when the photovoltaic air conditioner and the energy storage device cannot obtain power from the grid, the remaining power of the energy storage device is related to the operating power of the photovoltaic air conditioner and the working mode of the photovoltaic energy storage inverter. The energy coupling device can control the working mode of the photovoltaic energy storage inverter and the photovoltaic air conditioner according to the remaining power of the energy storage device, which can effectively protect the photovoltaic energy storage inverter and the photovoltaic air conditioner and ensure the normal operation of the photovoltaic air conditioner.
[0019] In some embodiments of this application, when the photovoltaic energy storage air conditioning system is off-grid, and when the remaining power of the energy storage device is in a first range and a third range, the energy coupling device is configured to adjust the photovoltaic energy storage inverter to enter off-grid mode; when the remaining power of the energy storage device is in a third range, the energy coupling device is configured to disconnect the power supply circuit between the energy storage device and the photovoltaic air conditioning system. When the remaining power of the energy storage device is within the second range, the energy coupling device is configured to send a frequency reduction command to the photovoltaic air conditioner.
[0020] This technical solution has the following beneficial effects or advantages: When the remaining power of the energy storage device is low and within the lower limit range, the energy coupling device controls the relay to disconnect the power supply circuit between the energy storage device and the photovoltaic air conditioner; when the remaining power of the energy storage device is within the normal range, the energy coupling device activates the photovoltaic air conditioner frequency reduction function based on the remaining battery power, the daily solar energy forecast, and the emergency operation time of the load, thus limiting the power operation of the photovoltaic air conditioner.
[0021] In some embodiments of this application, the energy coupling device is further configured to: This technical solution has the following beneficial effects or advantages: When the actual output power of the photovoltaic energy storage inverter approaches the rated output power, in order to protect the photovoltaic energy storage inverter and the photovoltaic air conditioner, the energy coupling device sends a frequency reduction command to the photovoltaic air conditioner, thereby effectively reducing the actual output power of the photovoltaic energy storage inverter and achieving the protection purpose.
[0022] In some embodiments of this application, When the photovoltaic air conditioner is in the start-up state, the starting energy of the photovoltaic air conditioner is provided by the energy storage device and / or the photovoltaic energy storage inverter through the energy coupling device; When the photovoltaic air conditioner is in standby mode, its standby power is provided by the power grid.
[0023] This technical solution has the following beneficial effects or advantages: The photovoltaic air conditioner has very low power consumption in standby mode and can be directly powered by the grid. This effectively reduces the difficulty of power control for the photovoltaic air conditioner by the energy coupling device, and divides the power supply energy of the photovoltaic air conditioner into standby energy and start-up energy.
[0024] Standby energy is provided by the grid, while startup energy is provided by photovoltaic energy storage inverters and energy storage devices.
[0025] Furthermore, the starting energy voltage is higher than the standby energy voltage, so only the starting energy supplies power to the photovoltaic air conditioner when it starts up.
[0026] In some embodiments of this application, a photovoltaic energy storage air conditioning system is provided, including: Photovoltaic modules; A photovoltaic energy storage inverter is connected to the photovoltaic module; An energy coupling device is connected to the photovoltaic energy storage inverter and the photovoltaic air conditioner; The energy coupling device is configured to disable the emergency power supply function of the photovoltaic energy storage inverter and change the current source at the output terminal of the energy coupling device to a voltage source. The energy coupling device is also configured to send a frequency reduction command to the photovoltaic air conditioner when the DC port output power of the photovoltaic energy storage inverter is close to the rated power; The energy coupling device is also configured to control the photovoltaic energy storage air conditioning system to disconnect from the grid when the photovoltaic energy storage air conditioning system is disconnected from the grid.
[0027] This technical solution has the following beneficial effects or advantages: When the photovoltaic energy storage air conditioning system is not equipped with an energy storage device, the energy coupling device controls the photovoltaic energy storage inverter to output a fixed DC voltage of 580V, and the DC output power slowly increases. In addition, when the photovoltaic energy storage air conditioning system is off-grid, that is, when there is no power grid and no energy storage device, the energy coupling device controls the photovoltaic energy storage air conditioning system to cut off power, thereby achieving the purpose of protecting the system.
[0028] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 This is a schematic diagram of the principle of a photovoltaic air conditioner. Figure 2 This is a schematic diagram of the structural connections of an existing photovoltaic energy storage air conditioning system; Figure 3 This is a schematic diagram of the structural connection of the photovoltaic energy storage air conditioning system according to the embodiment; Figure 4 This is a schematic diagram of the power supply connection for the starting energy of the photovoltaic air conditioner according to the embodiment; Figure 5 This is a schematic diagram of the power supply connection for the standby energy of the photovoltaic air conditioner according to an embodiment; Figure 6 This is a flowchart illustrating the operation of the energy coupling device in the self-generating and self-consuming mode according to the embodiment. Figure 7 This is a flowchart illustrating the operation of the energy coupling device under the peak shaving and valley filling mode according to the embodiment. Figure 8This is a flowchart illustrating the operation of the off-grid mode energy coupling device according to an embodiment; Figure 9 A flowchart illustrating the process of transmitting frequency reduction commands for the energy coupling device according to an embodiment; Figure 10 This is a flowchart illustrating the operation of the energy coupling device without an energy storage device according to an embodiment. Figure label: 100. Photovoltaic modules; 200. Photovoltaic air conditioner; 210. Compressor; 220. Condenser; 230. Expansion valve; 240. Evaporator; 300. Photovoltaic energy storage inverter; 400. Energy storage devices; 500. Energy coupling device; 600. Power grid; 700, Special Load; 810. Rectifier; 820. Diode; 900. AC-DC module. Detailed Implementation
[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0032] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0036] As used herein, depending on the context, the term “if” may optionally be interpreted as meaning “when”, “in the event of”, “in response to determination”, or “in response to detection”. Similarly, depending on the context, the phrase “if it is determined that…” or “if [the stated condition or event] is detected” may optionally be interpreted as meaning “in the event of determination that…”, “in response to determination that…”, “when [the stated condition or event] is detected”, or “in response to the detection of [the stated condition or event]”.
[0037] The use of “for” or “configured to” in this article implies an open and inclusive language that does not exclude devices that are used or configured to perform additional tasks or steps.
[0038] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0039] This invention provides a photovoltaic energy storage air conditioning system, see reference. Figure 3It includes a photovoltaic module 100, a photovoltaic air conditioner 200, a photovoltaic energy storage inverter 300, an energy storage device 400, and an energy coupling device 500.
[0040] See Figure 2 The photovoltaic air conditioner 200 performs a refrigeration cycle by using a compressor 210, a condenser 220, an expansion valve 230, and an evaporator 240. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.
[0041] Low-temperature, low-pressure refrigerant enters compressor 210, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into condenser 220. Condenser 220 condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
[0042] Expansion valve 230 expands the high-temperature, high-pressure liquid refrigerant condensed in condenser 210 into a low-pressure liquid refrigerant. Evaporator 240 evaporates the refrigerant expanded in expansion valve 230 and returns the low-temperature, low-pressure refrigerant gas to compressor 210. Evaporator 240 achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, photovoltaic air conditioner 20 can regulate the temperature of the indoor space.
[0043] The outdoor unit of the photovoltaic air conditioner 200 refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of the photovoltaic air conditioner 200 includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.
[0044] The indoor and outdoor heat exchangers are used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the photovoltaic air conditioner 200 is used as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the photovoltaic air conditioner 200 is used as a cooler in cooling mode.
[0045] Reference Figure 2 As shown, this is a common scenario for a photovoltaic (PV) energy storage inverter 300: the PV module 100 is configured to convert solar energy into electrical energy. The PV module 100 is connected to the PV energy storage inverter 300, which in turn is connected to an energy storage device 400. The PV module 100 can charge the energy storage device 400 via a charging circuit, enabling the electrical energy generated by the PV module 100 to be output and stored in the energy storage device 400.
[0046] The photovoltaic module 100 can output power to the AC side for load use or be connected to the grid 600 through the charging circuit and inverter circuit.
[0047] The photovoltaic energy storage inverter 300 can convert direct current into alternating current, thereby outputting the electrical energy generated by the photovoltaic module 100 to the air conditioner or the power grid 600.
[0048] In addition, the energy storage device 400 outputs to the AC side via an inverter circuit for use by the load or is connected to the power grid 600.
[0049] The DC power in the energy storage device 400 can be output to the photovoltaic air conditioner 200 or the power grid 600 through the photovoltaic energy storage inverter 300.
[0050] The grid 600 can be charged by outputting to the energy storage device 400 through the rectifier circuit.
[0051] The alternating current in the power grid 600 can be converted into direct current by the photovoltaic energy storage inverter 300 and then stored in the energy storage device 400.
[0052] The photovoltaic module 100 and the energy storage device 400 supply power to the critical load through the inverter circuit via the LOAD port of the photovoltaic energy storage inverter 300.
[0053] When a critical load requires a large current or voltage, the photovoltaic module 100 and the energy storage device 400 can simultaneously provide power to it through the photovoltaic energy storage inverter 300.
[0054] Because the photovoltaic air conditioner 200 is a common load, but it uses a DC motor, it needs to be converted from AC to DC by the AC-DC module 900, which will inevitably cause energy loss due to power conversion.
[0055] Continue to refer to Figure 3 As shown, this embodiment provides a photovoltaic energy storage air conditioning system, including: 100 photovoltaic modules The photovoltaic air conditioner 200 is connected to the power grid 600. A photovoltaic energy storage inverter 300 is connected to the photovoltaic module 100; The energy storage device 400 is connected to the photovoltaic energy storage inverter 300; An energy coupling device 500 is connected to the photovoltaic energy storage inverter 300, the energy storage device 400, and the photovoltaic air conditioner 200; The energy coupling device 500 is configured to control the input power of the photovoltaic energy storage inverter 300 grid port 600 based on the remaining power of the energy storage device 400. The energy coupling device 500 is also configured to control the emergency power function of the photovoltaic energy storage inverter 300.
[0056] In some embodiments of this application, the electricity generated by the photovoltaic module 100 can be converted into AC power by the photovoltaic energy storage inverter 300 to supply AC loads, and can also be used as an emergency power source to supply power to important loads.
[0057] In some embodiments of this application, the photovoltaic module 100 can also be converted into AC power by the photovoltaic energy storage inverter 300 and then connected to the grid, that is, supplying power to the grid 600.
[0058] In some embodiments of this application, the photovoltaic energy storage inverter 300 can be connected to the energy coupling device 500 through a DC output port, thereby enabling DC power supply to the photovoltaic air conditioner 200.
[0059] In some embodiments of this application, the photovoltaic energy storage inverter 300 can be connected to the energy storage device 400 through a DC output port, which can enable the photovoltaic module 100 to charge the energy storage device 400.
[0060] In some embodiments of this application, the energy coupling device 500 can also be connected to the voltage output port of the energy storage device 400; at the same time, the photovoltaic air conditioner 200 is connected to the DC output port of the energy coupling device 500 for power supply; thereby realizing that the photovoltaic energy storage inverter 300 and the energy storage device 400 directly supply DC power to the photovoltaic air conditioner 200, effectively reducing the energy loss caused by power conversion, and can also charge the energy storage device 400.
[0061] In some embodiments of this application, the DC output port of the energy storage device 400 shares the same bus with the DC output port of the photovoltaic energy storage inverter 300 and the DC port of the energy coupling device 500; the photovoltaic air conditioner 200 draws power directly from the BAT port of the energy coupling device 500, that is, the photovoltaic air conditioner 200 draws power directly from the DC port of the energy coupling device 500.
[0062] In some embodiments of this application, in order to reduce the control difficulty of the energy coupling device 500 over the photovoltaic air conditioner 200, the power supply of the photovoltaic air conditioner 200 is divided into standby power supply and start-up power supply, referring to... Figure 4 and Figure 5 As shown.
[0063] In some embodiments of this application, the photovoltaic air conditioner 200 has very low power in standby mode, so when the photovoltaic air conditioner 200 is in standby mode, its standby power supply is drawn from the power grid 600.
[0064] In some embodiments of this application, reference is made to Figure 4As shown, the power supply from the power grid 600 is input to the photovoltaic air conditioner 200 after passing through the rectifier 810 and the diode 820. The rectifier 810 can be AC380V / DC400V, 500W; the diode 820 is used to prevent backfeeding.
[0065] In some embodiments of this application, reference is made to Figure 5 As shown, when the photovoltaic air conditioner 200 is in the start-up state, the required start-up energy voltage is higher than the standby energy voltage. Therefore, when the photovoltaic air conditioner 200 is started, only the start-up power supply provides power to the photovoltaic air conditioner 200. The start-up power supply of the photovoltaic air conditioner 200 is obtained from the photovoltaic energy storage inverter 300 and / or the energy storage device 400.
[0066] In some embodiments of this application, the photovoltaic energy storage air conditioner is divided into a self-consumption mode, a peak shaving and valley filling mode, and an off-grid mode; the working modes of the energy coupling device 500 are described below according to the above three modes.
[0067] Self-use mode In some embodiments of this application, the photovoltaic energy storage inverter 300 has an EPS function, which can provide emergency power for important loads. Since the output power of the photovoltaic energy storage inverter 300 is divided into EPS power and power supplied to the photovoltaic air conditioner 200, in order to ensure the power supply of the photovoltaic air conditioner 200, the energy coupling device 500 is also used to limit the EPS function power of the photovoltaic energy storage inverter 300.
[0068] In some embodiments of this application, the energy coupling device 500 is limited by (total output power of the photovoltaic energy storage inverter 300 - maximum power of the photovoltaic air conditioner 200) / 2.
[0069] Generally, when the total output power of the photovoltaic energy storage inverter 300 is 60KW and the maximum power of the photovoltaic air conditioner 200 is 55KW, the power of the EPS function of the energy coupling device 500 is adjusted to 2.5KW.
[0070] In some embodiments of this application, in order to coordinate with the energy coupling device 500 to control the energy storage device 400 based on the remaining power of the energy storage device 400, the remaining power of the energy storage device 400 includes a first range, a second range, and a third range, wherein the remaining power in the first range is not less than the remaining power in the second range, and the remaining power in the second range is not less than the remaining power in the third range.
[0071] In some embodiments of this application, the first range is the upper limit of the remaining power of the energy storage device 400, the third range is the lower limit of the remaining power of the energy storage device 400, and the second range is the range where the remaining power of the energy storage device 400 is between the upper and lower limits.
[0072] In some embodiments of this application, when the remaining power of the energy storage device 400 is within a first range, that is, when the remaining power of the energy storage device 400 is relatively large and is at the upper limit, the energy coupling device 500 is configured to: control the input power of the grid 600 port of the photovoltaic energy storage inverter 300; and the grid 600 port of the photovoltaic energy storage inverter 300 is in a discharge state.
[0073] In some embodiments of this application, the energy coupling device 500 controls the input power of the photovoltaic energy storage inverter 300 to the grid 600 port to be less than 1 kW. That is, when the energy storage device 400 has sufficient remaining power, it can limit the input power from the grid 600 to the photovoltaic energy storage inverter 300. At this time, the grid 600 port of the photovoltaic energy storage inverter 300 is in a discharging state, meaning the photovoltaic energy storage inverter 300 discharges to the grid 600. This allows for reasonable power configuration of the photovoltaic energy storage inverter 300 and ensures the normal operation of the photovoltaic air conditioner 200.
[0074] In some embodiments of this application, during actual application, the input power of the photovoltaic energy storage inverter 300 at the grid port 600 is typically set to 0 kW. In this case, the photovoltaic air conditioner 200 draws power from the photovoltaic module 100 and the energy storage device 400.
[0075] In some embodiments of this application, when the remaining power of the energy storage device 400 is within a second range, that is, when the remaining power of the energy storage device 400 is within a normal range, the energy coupling device 500 is configured to control the input power of the grid 600 port of the photovoltaic energy storage inverter 300.
[0076] In some embodiments of this application, the energy coupling device 500 controls the input power of the photovoltaic energy storage inverter 300 to be less than 1KW at the grid 600 port. That is, when the remaining power of the energy storage device 400 is sufficient to cope with the starting power of the photovoltaic air conditioner 200, the input power from the grid 600 to the photovoltaic energy storage inverter 300 can be limited. At this time, the photovoltaic air conditioner 200 draws power from the photovoltaic module 100 and the energy storage device 400.
[0077] In some embodiments of this application, when the remaining power of the energy storage device 400 is in a third range, that is, when the lower limit value of the energy storage device 400 is reached, the energy coupling device 500 is configured to control the photovoltaic energy storage inverter 300 to charge the energy storage device 400.
[0078] In some embodiments of this application, when the remaining power of the energy storage device 400 reaches the lower limit of the energy storage device 400, the power of the input port of the photovoltaic energy storage inverter 300 to the grid 600 is limited; that is, the grid 600 is allowed to supply power to the photovoltaic energy storage inverter 300, and the photovoltaic module 100 and the grid 600 are used to provide power supply guarantee for the photovoltaic air conditioner 200.
[0079] In some embodiments of this application, when the remaining power of the energy storage device 400 reaches the lower limit of the energy storage device 400, the photovoltaic module 100 charges the energy storage device 400 to increase the remaining power of the energy storage device 400.
[0080] In some embodiments of this application, when the remaining power of the energy storage device 400 reaches the lower limit of the energy storage device 400, the photovoltaic module 100 charges the energy storage device 400 to increase the remaining power of the energy storage device 400 to 40% of the battery capacity.
[0081] In some embodiments of this application, reference is made to Figure 6 As shown, in the self-consumption mode, the working process of the energy coupling device 500 is as follows: S100, System power-on; S200, Closed Photovoltaic Air Conditioner 200 DC Relay; S300: Determine whether the output power of the energy coupling device 500 is not less than 500W, that is, determine whether the photovoltaic air conditioner 200 is in start-up mode. S301. When the output power of the energy coupling device 500 is less than 500W, it means that the photovoltaic air conditioner 200 is in standby mode; when the photovoltaic air conditioner 200 is in standby mode, the photovoltaic energy storage inverter 300 is normally controlled for charging and discharging. S400 When the photovoltaic air conditioner 200 is in start-up mode, it is necessary to supply DC power to the photovoltaic air conditioner 200. The photovoltaic energy storage inverter 300 works in the self-consumption mode of the photovoltaic energy storage air conditioner system. S401, Energy coupling device 500 supplies power to photovoltaic air conditioner 200; S402. Is the actual output power of the photovoltaic energy storage inverter 300 not less than 60KW? S403. If the actual output power of the photovoltaic energy storage inverter 300 is greater than 60KW, then send a frequency reduction command to all photovoltaic air conditioners 200 via 485 to CAT; otherwise, return to step S300. S404 and CAT1 send frequency reduction commands to the photovoltaic air conditioner 200.
[0082] Peak shaving and valley filling mode In some embodiments of this application, in this mode, the power control of the EPS function of the photovoltaic energy storage inverter 300 by the energy coupling device 500 is the same as in the self-consumption mode.
[0083] During the discharge period: In some embodiments of this application, when the remaining power of the energy storage device 400 is within a first range, that is, when the remaining power of the energy storage device 400 is relatively large and is at the upper limit, the energy coupling device 500 is configured to: control the input power of the grid 600 port of the photovoltaic energy storage inverter 300; and the grid 600 port of the photovoltaic energy storage inverter 300 is in a discharge state.
[0084] In some embodiments of this application, the energy coupling device 500 controls the input power of the photovoltaic energy storage inverter 300 to the grid 600 port to be less than 1 kW. That is, when the energy storage device 400 has sufficient remaining power, it can limit the input power from the grid 600 to the photovoltaic energy storage inverter 300. At this time, the grid 600 port of the photovoltaic energy storage inverter 300 is in a discharging state, meaning the photovoltaic energy storage inverter 300 discharges to the grid 600. This allows for reasonable power configuration of the photovoltaic energy storage inverter 300 and ensures the normal operation of the photovoltaic air conditioner 200.
[0085] In some embodiments of this application, during actual application, the input power of the photovoltaic energy storage inverter 300 at the grid port 600 is typically set to 0 kW. In this case, the photovoltaic air conditioner 200 draws power from the photovoltaic module 100 and the energy storage device 400.
[0086] In some embodiments of this application, when the remaining power of the energy storage device 400 is within a second range, that is, when the remaining power of the energy storage device 400 is within a normal range, the energy coupling device 500 is configured to control the input power of the grid 600 port of the photovoltaic energy storage inverter 300.
[0087] In some embodiments of this application, the energy coupling device 500 controls the input power of the photovoltaic energy storage inverter 300 to be less than 1KW at the grid 600 port. That is, when the remaining power of the energy storage device 400 is sufficient to cope with the starting power of the photovoltaic air conditioner 200, the input power from the grid 600 to the photovoltaic energy storage inverter 300 can be limited. At this time, the photovoltaic air conditioner 200 draws power from the photovoltaic module 100 and the energy storage device 400.
[0088] In some embodiments of this application, when the remaining power of the energy storage device 400 is in a third range, that is, when the lower limit value of the energy storage device 400 is reached, the energy coupling device 500 is configured to control the photovoltaic energy storage inverter 300 to charge the energy storage device 400.
[0089] In some embodiments of this application, when the remaining power of the energy storage device 400 reaches the lower limit of the energy storage device 400, the power of the input port of the grid 600 of the photovoltaic energy storage inverter 300 is no longer limited; that is, the grid 600 is allowed to supply power to the photovoltaic energy storage inverter 300, and the photovoltaic module 100 and the grid 600 are used to provide power supply guarantee for the photovoltaic air conditioner 200.
[0090] In some embodiments of this application, when the remaining power of the energy storage device 400 reaches the lower limit of the energy storage device 400, the photovoltaic module 100 charges the energy storage device 400 to increase the remaining power of the energy storage device 400.
[0091] In some embodiments of this application, when the remaining power of the energy storage device 400 reaches the lower limit of the energy storage device 400, the photovoltaic module 100 charges the energy storage device 400 to increase the remaining power of the energy storage device 400 to 40% of the battery capacity.
[0092] During the charging period: When the remaining power of the energy storage device 400 is within a first range, that is, when the remaining power of the energy storage device 400 is relatively large and is at the upper limit, the energy coupling device 500 is configured to: control the input power of the grid 600 port of the photovoltaic energy storage inverter 300; and the grid 600 port of the photovoltaic energy storage inverter 300 is in a discharge state.
[0093] In some embodiments of this application, the energy coupling device 500 controls the input power of the photovoltaic energy storage inverter 300 to the grid 600 port to be less than 1 kW. That is, when the energy storage device 400 has sufficient remaining power, it can limit the input power from the grid 600 to the photovoltaic energy storage inverter 300. At this time, the grid 600 port of the photovoltaic energy storage inverter 300 is in a discharging state, meaning the photovoltaic energy storage inverter 300 discharges to the grid 600. This allows for reasonable power configuration of the photovoltaic energy storage inverter 300 and ensures the normal operation of the photovoltaic air conditioner 200.
[0094] In some embodiments of this application, during actual application, the input power of the photovoltaic energy storage inverter 300 at the grid port 600 is typically set to 0 kW. In this case, the photovoltaic air conditioner 200 draws power from the photovoltaic module 100 and the energy storage device 400.
[0095] In some embodiments of this application, when the remaining power of the energy storage device 400 is in the second and third ranges, the energy coupling device 500 is configured to control the photovoltaic energy storage inverter 300 to charge the energy storage device 400.
[0096] In some embodiments of this application, when the remaining power of the energy storage device 400 is below the upper limit of the energy storage device 400, the power of the input port of the grid 600 of the photovoltaic energy storage inverter 300 is no longer limited; that is, the grid 600 is allowed to supply power to the photovoltaic energy storage inverter 300, and the photovoltaic module 100 and the grid 600 are used to provide power supply guarantee for the photovoltaic air conditioner 200.
[0097] In some embodiments of this application, the photovoltaic module 100 charges the energy storage device 400, thereby increasing the remaining power of the energy storage device 400.
[0098] In some embodiments of this application, when the remaining power of the energy storage device 400 reaches the lower limit of the energy storage device 400, the photovoltaic module 100 charges the energy storage device 400 to increase the remaining power of the energy storage device 400 to 40% of the battery capacity.
[0099] During the blank time period: In some embodiments of this application, the operating mode of the energy coupling device 500 is the same as its operating mode during the discharge period.
[0100] In some embodiments of this application, reference is made to Figure 7 As shown, in the self-consumption mode, the working process of the energy coupling device 500 is as follows: S100, System power-on; S200, Closed Photovoltaic Air Conditioner 200 DC Relay; S300: Determine whether the output power of the energy coupling device 500 is not less than 500W, that is, determine whether the photovoltaic air conditioner 200 is in start-up mode. S301. When the output power of the energy coupling device 500 is less than 500W, it means that the photovoltaic air conditioner 200 is in standby mode; when the photovoltaic air conditioner 200 is in standby mode, the photovoltaic energy storage inverter 300 is normally controlled for charging and discharging. S500 When the photovoltaic air conditioner 200 is in start-up mode, DC power needs to be supplied to the photovoltaic air conditioner 200, and the photovoltaic energy storage inverter 300 works in the peak shaving and valley filling mode of the photovoltaic energy storage air conditioner system. S501, Energy coupling device 500 supplies power to photovoltaic air conditioner 200; S502. Is the actual output power of the photovoltaic energy storage inverter 300 not less than 60KW? S503. If the actual output power of the photovoltaic energy storage inverter 300 is greater than 60KW, then send a frequency reduction command to the communication module CAT1 via 485 to all photovoltaic air conditioners 200; otherwise, return to step S300. S504 and communication module CAT1 send a frequency reduction command to photovoltaic air conditioner 200.
[0101] In some embodiments of this application, under peak shaving and valley filling mode, by configuring an energy storage device 400, it is possible to participate in industrial and commercial peak-valley arbitrage. Using a two-charge, two-discharge configuration, ideally all energy would be used for the photovoltaic air conditioner 200, resulting in a daily saving of approximately 8% of electricity conversion consumption.
[0102] Offline mode In some embodiments of this application, when the photovoltaic energy storage air conditioning system is off-grid, the energy coupling device 500 is configured to adjust the operating mode of the photovoltaic energy storage inverter 300 and the photovoltaic air conditioner 200 according to the remaining power of the energy storage device 400.
[0103] In some embodiments of this application, when the remaining power of the energy storage device 400 is within a first range, that is, when the remaining power of the energy storage device 400 is relatively large and is at the upper limit, the energy coupling device 500 is configured to: adjust the photovoltaic energy storage inverter 300 to enter the normal off-grid mode.
[0104] In some embodiments of this application, the electrical energy of the photovoltaic module 100 enters the energy storage device 400 or the energy coupling device 500 after passing through the photovoltaic energy storage inverter 300. This effectively protects the photovoltaic energy storage inverter 300 and the photovoltaic air conditioner 200, and ensures the normal operation of the photovoltaic air conditioner 200.
[0105] In some embodiments of this application, when the remaining power of the energy storage device 400 is in a second range, that is, when the remaining power of the energy storage device 400 is in the normal range, the energy coupling device 500 is configured to: activate the frequency reduction function of the photovoltaic air conditioner 200 according to the remaining battery power, the daily solar energy forecast, and the emergency operation time of the load, and limit the power operation of the photovoltaic air conditioner 200.
[0106] In some embodiments of this application, when the remaining power of the energy storage device 400 is in the third range, that is, when the lower limit value of the energy storage device 400 is reached, the energy coupling device 500 is configured to: adjust the photovoltaic energy storage inverter 300 to enter the normal off-grid mode; and at the same time control the relay to disconnect the power supply circuit between the energy storage device 400 and the photovoltaic air conditioner 200.
[0107] In some embodiments of this application, when the power grid 600 is restored, the coupled energy device will issue a command to return to the previous storable operating mode.
[0108] In some embodiments of this application, reference is made to Figure 8 As shown, in off-grid mode, the operation of the energy coupling device 500 is as follows: S100, System power-on; S200, Closed Photovoltaic Air Conditioner 200 DC Relay; S300: Determine whether the output power of the energy coupling device 500 is not less than 500W, that is, determine whether the photovoltaic air conditioner 200 is in start-up mode. S301. When the output power of the energy coupling device 500 is less than 500W, it means that the photovoltaic air conditioner 200 is in standby mode; when the photovoltaic air conditioner 200 is in standby mode, the photovoltaic energy storage inverter 300 is normally controlled for charging and discharging. S600 When the photovoltaic air conditioner 200 is in start-up mode, DC power needs to be supplied to the photovoltaic air conditioner 200, and the photovoltaic energy storage inverter 300 operates in the off-grid mode of the photovoltaic energy storage air conditioner system. S601, Energy coupling device 500 supplies power to photovoltaic air conditioner 200; S602. Is the actual output power of the photovoltaic energy storage inverter 300 not less than 60KW? S603. If the actual output power of the photovoltaic energy storage inverter 300 is greater than 60KW, then send a frequency reduction command to the communication module CAT1 via 485 to all photovoltaic air conditioners 200; otherwise, return to step S300. S604, the communication module CAT1 sends a frequency reduction command to the photovoltaic air conditioner 200.
[0109] In some embodiments of this application, the power of the photovoltaic energy storage inverter 300 is reasonably configured so that when the remaining power of the energy storage device 400 is at the upper limit or normal value, both the photovoltaic energy storage inverter 300 and the energy storage device 400 can serve as energy sources to power the photovoltaic air conditioner 200. For example, if the power of the photovoltaic energy storage inverter 300 is 60KW and the energy storage device 400 can output 60KW, then the photovoltaic air conditioner 200 can be configured with a maximum power of 120KW. However, to ensure the normal operation of the photovoltaic air conditioner 200, it is recommended to configure the photovoltaic air conditioner 200 and the photovoltaic hybrid inverter in a 1:1 power ratio.
[0110] In some embodiments of this application, the energy coupling device 500 is further configured to: Based on the comparison between the actual output power and the rated output power of the photovoltaic energy storage inverter 300, it is determined whether to send a frequency reduction command to the photovoltaic air conditioner 200.
[0111] Reference Figure 9 As shown, the working process of the energy coupling device 500 is as follows: S100, System power-on; S200 and energy coupling device 500 send commands to photovoltaic air conditioner 200 to "charge" it; S300: Determine that the DC port output power of the photovoltaic energy storage inverter is ≤95% of the rated power. S400, if so, then the photovoltaic air conditioner 200 is powered normally; S500, if not, the energy coupling device 500 sends a frequency reduction command to the photovoltaic air conditioner 200, and the frequency reduction usage time is 20 minutes; S600 and photovoltaic air conditioner 200 are shut down, and energy coupling device 500 issues an instruction to stop "charging" photovoltaic air conditioner 200.
[0112] When the actual output power of the photovoltaic energy storage inverter 300 is close to the rated output power, in order to protect the photovoltaic energy storage inverter 300 and the photovoltaic air conditioner 200, the energy coupling device 500 sends a frequency reduction command to the photovoltaic air conditioner 200, thereby effectively reducing the actual output power of the photovoltaic energy storage inverter 300 and achieving the protection purpose.
[0113] In some embodiments of this application, a photovoltaic energy storage air conditioning system is provided, including: 100 photovoltaic modules The photovoltaic air conditioner 200 is connected to the power grid 600. A photovoltaic energy storage inverter 300 is connected to the photovoltaic module 100; An energy coupling device 500 is connected to the photovoltaic energy storage inverter 300 and the photovoltaic air conditioner 200; The energy coupling device 500 is configured to disable the emergency power supply function of the photovoltaic energy storage inverter 300, and to change the current source at the output end of the energy coupling device 500 to a voltage source. The energy coupling device 500 is also configured to send a frequency reduction command to the photovoltaic air conditioner 200 when the sum of the currents in the energy coupling device 500 approaches the reverse protection value. The energy coupling device 500 is also configured to control the photovoltaic energy storage air conditioning system to disconnect from the grid when the photovoltaic energy storage air conditioning system is disconnected from the grid.
[0114] In some embodiments of this application, the emergency power supply function of the photovoltaic energy storage inverter 300 is disabled, that is, the photovoltaic energy storage inverter 300 no longer supplies power to important loads, and the DC port output is changed from a current source to a voltage source, so that the DC port can continuously supply power to the photovoltaic air conditioner 200.
[0115] In some embodiments of this application, the sum of the currents of each path of the energy coupling device 500 control board is protected at 95% of the reverse protection value, that is, the frequency reduction command is triggered to reduce the load of the photovoltaic air conditioner 200.
[0116] In some embodiments of this application, when the device is off-grid, all devices are powered off in order to protect the photovoltaic air conditioner 200 and the energy coupling device 500.
[0117] Reference Figure 10 As shown, in off-grid mode, the operation of the energy coupling device 500 is as follows: S100, System power-on; S200, Closed Photovoltaic Air Conditioner 200 DC Relay; S300: Determine whether the output power of the energy coupling device 500 is not less than 500W, that is, determine whether the photovoltaic air conditioner 200 is in start-up mode. S701. If yes, the DC output voltage of the photovoltaic energy storage inverter 300 is fixed at 580V, and the DC output power slowly increases; if not, return to step S300. S702, Energy coupling device 500 supplies power to photovoltaic air conditioner 200.
[0118] When the photovoltaic energy storage air conditioning system is not equipped with an energy storage device 400, the energy coupling device 500 controls the photovoltaic energy storage inverter 300 to output a fixed DC voltage of 580V, and the DC output power slowly increases. In addition, when the photovoltaic energy storage air conditioning system is off-grid, that is, when there is no grid 600 and no energy storage device 400, the energy coupling device 500 controls the photovoltaic energy storage air conditioning system to cut off power, thereby achieving the purpose of protecting the system.
[0119] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
[0120] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A photovoltaic energy storage air conditioning system, including: Photovoltaic modules Photovoltaic air conditioners are connected to the power grid. A photovoltaic energy storage inverter is connected to the photovoltaic module; An energy storage device is connected to the photovoltaic energy storage inverter; An energy coupling device is connected to the photovoltaic energy storage inverter, the energy storage device, and the photovoltaic air conditioner; The energy coupling device is characterized in that it is configured to control the input power of the photovoltaic energy storage inverter grid port according to the remaining power of the energy storage device; The energy coupling device is also configured to control the emergency power function of the photovoltaic energy storage inverter.
2. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that, The remaining power of the energy storage device includes a first range, a second range, and a third range. The remaining power in the first range is not less than the remaining power in the second range, and the remaining power in the second range is not less than the remaining power in the third range. When the remaining power of the energy storage device is in the first range, the energy coupling device is configured to control the input power of the grid port of the photovoltaic energy storage inverter, and the grid port of the photovoltaic energy storage inverter is in a discharge state.
3. The photovoltaic energy storage air conditioning system according to claim 2, characterized in that, When the remaining power of the energy storage device is within the second range, the energy coupling device is configured to control the input power of the grid port of the photovoltaic energy storage inverter.
4. The photovoltaic energy storage air conditioning system according to claim 2, characterized in that, When the remaining power of the energy storage device is within the third range, the energy coupling device is configured to control the photovoltaic energy storage inverter to charge the energy storage device.
5. The photovoltaic energy storage air conditioning system according to claim 2, characterized in that, During the charging period in peak shaving and valley filling mode, and when the remaining power of the energy storage device is within the second range, the energy coupling device is configured to control the photovoltaic energy storage inverter to charge the energy storage device.
6. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that, When the photovoltaic energy storage air conditioning system is off-grid, the energy coupling device is configured to adjust the operating mode of the photovoltaic energy storage inverter and the photovoltaic air conditioning according to the remaining power of the energy storage device.
7. The photovoltaic energy storage air conditioning system according to claim 6, characterized in that, When the photovoltaic energy storage air conditioning system is off-grid, and when the remaining power of the energy storage device is within the first and third ranges, the energy coupling device is configured to adjust the photovoltaic energy storage inverter to enter off-grid mode; when the remaining power of the energy storage device is within the third range, the energy coupling device is configured to disconnect the power supply circuit between the energy storage device and the photovoltaic air conditioning system. When the remaining power of the energy storage device is within the second range, the energy coupling device is configured to send a frequency reduction command to the photovoltaic air conditioner.
8. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that, Based on the comparison between the actual output power and the rated output power of the photovoltaic energy storage inverter, it is determined whether to send a frequency reduction command for the photovoltaic air conditioner.
9. The photovoltaic energy storage air conditioning system according to claim 1, characterized in that, When the photovoltaic air conditioner is in the start-up state, the starting energy of the photovoltaic air conditioner is provided by the energy storage device and / or the photovoltaic energy storage inverter through the energy coupling device; When the photovoltaic air conditioner is in standby mode, its standby power is provided by the power grid.
10. A photovoltaic energy storage air conditioning system, including: Photovoltaic modules, photovoltaic air conditioners, and connections to the power grid; A photovoltaic energy storage inverter is connected to the photovoltaic module; An energy coupling device is connected to the photovoltaic energy storage inverter and the photovoltaic air conditioner; The energy coupling device is characterized in that it is configured to disable the emergency power supply function of the photovoltaic energy storage inverter, and the current source at the output terminal of the energy coupling device is changed to a voltage source. The energy coupling device is also configured to send a frequency reduction command to the photovoltaic air conditioner when the DC port output power of the photovoltaic energy storage inverter is close to the rated power; The energy coupling device is also configured to control the photovoltaic energy storage air conditioning system to disconnect from the grid when the photovoltaic energy storage air conditioning system is disconnected from the grid.