Photovoltaic energy storage system, control method, electronic equipment and storage medium

Abstract

The invention relates to the technical field of energy management, particularly provides a photovoltaic energy storage system, a control method, electronic equipment and a storage medium, and aims to solve the technical problems of high overall cost, complex system and low conversion efficiency of a photovoltaic system of a battery swap station. In order to achieve the purpose, the photovoltaic energy storage system is applied to an energy supplementing station and comprises photovoltaic equipment, a switch assembly, a plurality of batteries and a battery dispatching management module. Wherein the photovoltaic equipment is connected with the battery through the switch assembly, and the photovoltaic equipment is configured to charge the battery; the switch assembly is configured to connect or disconnect the connection between the photovoltaic equipment and the battery; the battery scheduling management module is configured to replace a battery connected to the photovoltaic device. Through the above implementation mode, the photovoltaic device can be directly connected to the battery in the energy complementing station, multiple times of conversion is not needed, the energy conversion link is reduced, the conversion efficiency and the absorption rate of the photovoltaic energy storage system are improved, the system structure is simplified, and the overall cost is low.

Description

Technical Field

[0001] The present application relates to the field of energy management technology, and specifically to a photovoltaic energy storage system, a control method, an electronic device and a storage medium. Background Art

[0002] At present, photovoltaic power generation, as an important form of clean energy, has been widely used in life. After the photovoltaic system is connected to the grid, it can be applied to equipment at all levels. At the same time, with the increasing number of new energy vehicles, the batteries inside the vehicles are also distributed everywhere as energy storage units. The battery swap station collects some batteries and manages the battery charging and discharging, which can be regarded as a huge distributed energy storage device. In terms of the self-generation and self-sale of photovoltaic power generation, the battery swap station belongs to a source-load integrated system. Through the unified control of the local central unit, the photovoltaic power generation of the battery swap station can be supplied to the battery swap station itself with the maximum efficiency and capacity, and can also be fed back to the power grid during peak power consumption.

[0003] In photovoltaic power generation applications, the DC power generated by photovoltaic modules needs to be converted into AC power by inverters and then fed into the power grid. When charging is needed, the battery swap station takes AC power from the power grid and converts it into DC power by rectifiers to charge the battery. This method involves multiple conversions, i.e. DC to AC and AC to DC, which results in high overall cost, complex system, and low conversion efficiency.

[0004] Accordingly, the art needs a new technical solution to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present application is proposed to provide a photovoltaic energy storage system, control method, electronic device and storage medium that solves or at least partially resolves the technical problems of high overall cost, complex system and low conversion efficiency of the photovoltaic system of the battery swap station.

[0006] In a first aspect, a photovoltaic energy storage system is provided, which is applied to an energy replenishment station, wherein the photovoltaic energy storage system includes a photovoltaic device, a switch assembly, a plurality of batteries and a battery scheduling management module;

[0007] Wherein, the photovoltaic device is connected to the battery via the switch assembly, and the photovoltaic device is configured to charge the battery;

[0008] The switch assembly is configured to switch on or off the connection between the photovoltaic device and the battery;

[0009] The battery scheduling management module is configured to replace the battery connected to the photovoltaic device.

[0010] In a technical solution of the above photovoltaic energy storage system, the photovoltaic energy storage system further includes a DC / DC converter;

[0011] The DC / DC converter is arranged between the photovoltaic device and the switch component, and the photovoltaic device is connected to the battery through the DC / DC converter and the switch component;

[0012] The DC / DC converter is configured to match the internal and external impedances of the photovoltaic energy storage system based on a maximum power point tracking strategy so that the operating point of the DC / DC converter is located at a maximum power output position.

[0013] In a technical solution of the above photovoltaic energy storage system, the photovoltaic energy storage system further includes a power grid, an AC bus, a plurality of AC / DC+DC / AC composite modules or a plurality of AC / DC modules;

[0014] One end of the AC bus is connected to the power grid, and the other end is connected to one end of the multiple AC / DC+DC / AC composite modules or multiple AC / DC modules.

[0015] In a technical solution of the above photovoltaic energy storage system, the photovoltaic energy storage system further includes a DC bus and a plurality of DC / DC modules;

[0016] When the other end of the AC bus is connected to one end of the multiple AC / DC modules, the other end of the multiple AC / DC modules is connected to one end of the DC bus;

[0017] The other end of the DC bus is connected to one end of the plurality of DC / DC modules.

[0018] In a technical solution of the above photovoltaic energy storage system, the photovoltaic energy storage system further includes a power distribution module;

[0019] One end of the power distribution module is connected to the other end of the multiple AC / DC+DC / AC composite modules or the multiple DC / DC modules, and the other end of the power distribution module is connected to the multiple batteries;

[0020] The power distribution module is configured to control the power grid or the photovoltaic device to charge the plurality of batteries.

[0021] In a technical solution of the above photovoltaic energy storage system, the photovoltaic energy storage system further includes a bidirectional AC / DC+DC / AC module, a unidirectional AC / DC+DC / AC module, a V2G charging pile and a unidirectional charging pile;

[0022] One end of the bidirectional AC / DC+DC / AC module is connected to the AC bus, and the other end is connected to the V2G charging pile;

[0023] One end of the unidirectional AC / DC+DC / AC module is connected to the AC bus, and the other end is connected to the unidirectional charging pile.

[0024] In a technical solution of the above photovoltaic energy storage system, the photovoltaic energy storage system further includes a bidirectional DC / DC module, a unidirectional DC / DC module, a V2G charging pile and a unidirectional charging pile;

[0025] One end of the bidirectional DC / DC module is connected to the DC bus, and the other end is connected to the V2G charging pile;

[0026] One end of the unidirectional DC / DC module is connected to the DC bus, and the other end is connected to the unidirectional charging pile.

[0027] In a technical solution of the above photovoltaic energy storage system, the photovoltaic energy storage system further includes an anti-backflow control module, an energy management module, a station internal power supply emergency module and other loads;

[0028] The station internal power supply emergency module and other loads are connected to the AC bus.

[0029] In a second aspect, the present application provides a control method for a photovoltaic energy storage system according to any one of the technical solutions of the above photovoltaic energy storage system, the method comprising:

[0030] Control the switch component to turn on or off to control the photovoltaic device to charge the connected battery;

[0031] When the battery connected to the photovoltaic device is fully charged, the fully charged battery is replaced with other feeding batteries through the battery scheduling management module.

[0032] In a technical solution of the control method of the photovoltaic energy storage system, the method further includes:

[0033] The DC / DC converter is controlled based on a maximum power point tracking strategy to match the internal and external impedances of the photovoltaic energy storage system so that the operating point of the DC / DC converter is located at the maximum power output position.

[0034] In a third aspect, an electronic device is provided, comprising a processor and a memory, wherein the memory is suitable for storing a plurality of program codes, and the program codes are suitable for being loaded and run by the processor to execute the photovoltaic energy storage system control method described in any one of the technical solutions of the photovoltaic energy storage system control method.

[0035] In a fourth aspect, a computer-readable storage medium is provided, in which a plurality of program codes are stored, wherein the program codes are suitable for being loaded and run by a processor to execute the photovoltaic energy storage system control method described in any one of the technical solutions of the photovoltaic energy storage system control method mentioned above.

[0036] Solution 1. A photovoltaic energy storage system, applied to an energy replenishment station, characterized in that the photovoltaic energy storage system includes a photovoltaic device, a switch assembly, a plurality of batteries and a battery scheduling management module;

[0037] Wherein, the photovoltaic device is connected to the battery via the switch assembly, and the photovoltaic device is configured to charge the battery;

[0038] The switch assembly is configured to switch on or off the connection between the photovoltaic device and the battery;

[0039] The battery scheduling management module is configured to replace the battery connected to the photovoltaic device.

[0040] Solution 2. The photovoltaic energy storage system according to Solution 1, characterized in that the photovoltaic energy storage system further comprises a DC / DC converter;

[0041] The DC / DC converter is arranged between the photovoltaic device and the switch component, and the photovoltaic device is connected to the battery through the DC / DC converter and the switch component;

[0042] The DC / DC converter is configured to match the internal and external impedances of the photovoltaic energy storage system based on a maximum power point tracking strategy so that the operating point of the DC / DC converter is located at a maximum power output position.

[0043] Solution 3. The photovoltaic energy storage system according to Solution 2 is characterized in that the photovoltaic energy storage system further comprises a power grid, an AC bus, a plurality of AC / DC+DC / AC composite modules or a plurality of AC / DC modules;

[0044] One end of the AC bus is connected to the power grid, and the other end is connected to one end of the multiple AC / DC+DC / AC composite modules or multiple AC / DC modules.

[0045] Solution 4. The photovoltaic energy storage system according to Solution 3 is characterized in that the photovoltaic energy storage system further includes a DC bus and a plurality of DC / DC modules;

[0046] When the other end of the AC bus is connected to one end of the multiple AC / DC modules, the other end of the multiple AC / DC modules is connected to one end of the DC bus;

[0047] The other end of the DC bus is connected to one end of the plurality of DC / DC modules.

[0048] Solution 5. The photovoltaic energy storage system according to Solution 3 or 4, characterized in that the photovoltaic energy storage system further comprises a power distribution module;

[0049] One end of the power distribution module is connected to the other end of the multiple AC / DC+DC / AC composite modules or the multiple DC / DC modules, and the other end of the power distribution module is connected to the multiple batteries;

[0050] The power distribution module is configured to control the power grid or the photovoltaic device to charge the plurality of batteries.

[0051] Solution 6. The photovoltaic energy storage system according to Solution 3 is characterized in that the photovoltaic energy storage system also includes a bidirectional AC / DC+DC / AC module, a unidirectional AC / DC+DC / AC module, a V2G charging pile and a unidirectional charging pile;

[0052] One end of the bidirectional AC / DC+DC / AC module is connected to the AC bus, and the other end is connected to the V2G charging pile;

[0053] One end of the unidirectional AC / DC+DC / AC module is connected to the AC bus, and the other end is connected to the unidirectional charging pile.

[0054] Solution 7. The photovoltaic energy storage system according to Solution 4 is characterized in that the photovoltaic energy storage system further includes a bidirectional DC / DC module, a unidirectional DC / DC module, a V2G charging pile and a unidirectional charging pile;

[0055] One end of the bidirectional DC / DC module is connected to the DC bus, and the other end is connected to the V2G charging pile;

[0056] One end of the unidirectional DC / DC module is connected to the DC bus, and the other end is connected to the unidirectional charging pile.

[0057] Solution 8. The photovoltaic energy storage system according to any one of solutions 1 to 4, characterized in that the photovoltaic energy storage system further includes an anti-backflow control module, an energy management module, a station internal power supply emergency module and other loads;

[0058] The station internal power supply emergency module and other loads are connected to the AC bus.

[0059] Solution 9. A control method for a photovoltaic energy storage system according to any one of Solutions 1 to 8, characterized in that the method comprises:

[0060] Control the switch component to turn on or off to control the photovoltaic device to charge the connected battery;

[0061] When the battery connected to the photovoltaic device is fully charged, the fully charged battery is replaced with other feeding batteries through the battery scheduling management module.

[0062] Solution 10. The control method of the photovoltaic energy storage system according to Solution 9, characterized in that the method further comprises:

[0063] The DC / DC converter is controlled based on a maximum power point tracking strategy to match the internal and external impedances of the photovoltaic energy storage system so that the operating point of the DC / DC converter is located at the maximum power output position.

[0064] Solution 11. An electronic device comprising a processor and a memory, wherein the memory is suitable for storing multiple program codes, and wherein the program codes are suitable for being loaded and run by the processor to execute the control method of the photovoltaic energy storage system described in any one of Solutions 9 to 10.

[0065] Solution 12. A computer-readable storage medium storing a plurality of program codes, wherein the program codes are suitable for being loaded and run by a processor to execute the control method of the photovoltaic energy storage system described in any one of Solutions 9 to 10.

[0066] The above one or more technical solutions of this application have at least one or more of the following Beneficial effects:

[0067] In the technical solution for implementing the present application, the photovoltaic energy storage system applied to the energy replenishment station includes photovoltaic equipment, a switch assembly, multiple batteries and a battery scheduling management module; wherein the photovoltaic equipment is connected to the battery through the switch assembly, and the photovoltaic equipment is configured to charge the battery; the switch assembly is configured to turn on or off the connection between the photovoltaic equipment and the battery; the battery scheduling management module is configured to replace the battery connected to the photovoltaic equipment. Through the above implementation, the photovoltaic equipment can be directly connected to the battery in the energy replenishment station without multiple conversions, which reduces the energy conversion links, improves the conversion efficiency and absorption rate of the photovoltaic energy storage system, simplifies the system structure, and has a lower overall cost.

[0068] Furthermore, the DC / DC converter can be controlled through the maximum power point tracking strategy to achieve internal and external impedance matching of the photovoltaic energy storage system, so that the operating point of the DC / DC converter is always at the maximum output power position, further enhancing the energy utilization rate of photoelectric conversion. At the same time, through the scheduling of batteries in the energy replenishment station, the photovoltaic energy storage system can be fully self-used. Through the integration of light storage, charging, discharging and switching, the operating cost of the entire energy replenishment station is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The disclosure of the present application will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. Among them:

[0070] Figure 1 It is a structural diagram of an existing photovoltaic system;

[0071] Figure 2 is a schematic diagram of the main structure of a photovoltaic energy storage system according to an embodiment of the present application;

[0072] Figure 3 is a schematic diagram of the main structure of a photovoltaic energy storage system with a common AC bus according to an embodiment of the present application;

[0073] Figure 4 is a schematic diagram of the main structure of a photovoltaic energy storage system with a common DC bus according to an embodiment of the present application;

[0074] Figure 5 It is a schematic flow chart of the main steps of a control method for a photovoltaic energy storage system according to an embodiment of the present application;

[0075] Figure 6 It is a schematic diagram of the main structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0076] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0077] In the description of this application, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, memories, and may also include software parts, such as program codes, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. Non-temporary computer-readable storage media include any suitable media that can store program codes, such as disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc.

[0078] The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The term "at least one of A or B" or "at least one of A and B" has a similar meaning to "A and / or B" and may include only A, only B, or A and B. The singular forms "a", "the" and "the" may also include plural forms.

[0079] As described in the background technology, photovoltaic power generation, as an important form of clean energy, has been widely used in life. After the photovoltaic system generates electricity and is connected to the grid, it can be applied to equipment at all levels. At the same time, with the increasing number of new energy vehicles, the batteries inside the vehicles are also distributed everywhere as energy storage units. The battery swap station brings some batteries together and manages the charging and discharging of the batteries, which can be regarded as a huge distributed energy storage device. From the point of view of self-generation and self-sales of photovoltaic power generation, the battery swap station belongs to a source-load integrated system. Through the unified control of the local central unit, the photovoltaic power generation of the battery swap station can be supplied to the battery swap station itself with maximum efficiency and capacity, and can also be fed back to the power grid during peak power consumption.

[0080] See attached Figure 1 , Figure 1 It is a schematic diagram of the structure of an existing photovoltaic system. Figure 1 As shown in the figure, in photovoltaic power generation applications, the DC power generated by the photovoltaic panel needs to be converted into AC power by an inverter and then connected to the grid via the AC bus (AC BUS). When charging is required, AC power is taken from the grid and converted into DC power by a rectifier to charge the battery. This method involves multiple conversions, i.e. DC to AC, AC to DC, and the power of the photovoltaic power generation system installed in the battery swap station is limited, and the AC busbar paralleling efficiency is low, resulting in high overall costs, complex systems, low conversion efficiency, and the photovoltaic power generation of the battery swap station cannot be fully absorbed.

[0081] In order to solve the above problems, the present application provides a photovoltaic energy storage system, a control method, an electronic device and a storage medium, which are applied to energy replenishment stations.

[0082] See attached Figure 2 , Figure 2 FIG. 1 is a schematic diagram of the main structure of a photovoltaic energy storage system according to an embodiment of the present application. Figure 2 As shown, the photovoltaic energy storage system in the embodiment of the present application mainly includes a photovoltaic device 21, a switch component 22, a plurality of batteries 23 and a battery scheduling management module 24.

[0083] The photovoltaic device 21 is connected to the battery 23 via a switch assembly 22 , and multiple switch assemblies 22 between multiple photovoltaic devices 21 and the battery 23 are connected in parallel, so that the photovoltaic device 21 is configured to charge the battery 23 .

[0084] The switch 22 component is configured to switch on or off the connection between the photovoltaic device 21 and the battery 23 ; the battery scheduling management module 24 is configured to replace the battery 23 connected to the photovoltaic device 21 .

[0085] Specifically, the photovoltaic equipment 21 can be a plurality of photovoltaic panels on the roof of the energy replenishment station and / or a ground photovoltaic array, etc. Among them, the photovoltaic panels on the roof of the energy replenishment station are usually installed on the top of the building of the energy replenishment station to make full use of the idle space to receive solar energy. The ground photovoltaic array can be installed in an open space of the energy replenishment station, and the photovoltaic panels in the ground photovoltaic array can be arranged at a certain angle and spacing to better track the angle of the sun and improve the power generation efficiency.

[0086] Furthermore, each photovoltaic device 21 can be connected to the battery 23 via its corresponding switch assembly 22 to charge the battery 23 .

[0087] Among them, the switch component 22 can be Figure 2 The two back-to-back (also called common source reverse series) MOS tubes shown. The two back-to-back MOS tubes can play a blocking role under different voltage polarities. When an abnormal reverse voltage appears in the photovoltaic device 21 or the battery 23, the MOS tube can prevent the reverse current from flowing, prevent the circuit components from being damaged by the reverse voltage, and protect the photovoltaic device 21 and the battery 23.

[0088] By controlling the on and off of the switch component 22, the transmission of electric energy can be flexibly controlled. For example, according to the power generation state of the photovoltaic device 21, the power level of the battery 23, etc., one or two MOS tubes can be selectively turned on to achieve precise control of the charging process of the photovoltaic device 21 to the battery 23, such as starting charging, stopping charging, adjusting charging current, etc.

[0089] In addition, the switch component 22 can also be a relay (such as an electromagnetic relay, a solid-state relay), a thyristor (such as a unidirectional thyristor, a bidirectional thyristor), and an intelligent power switch (Intelligent Power Switch, IPS), etc., which is not limited here.

[0090] The battery scheduling management module 24 is used to replace the battery 23 connected to the photovoltaic device 21. Specifically, when the battery 23 reaches a full state under the charging action of the photovoltaic device 21, the battery scheduling management module 24 will execute a series of preset logics and instructions to remove the fully charged battery from the current position connected to the photovoltaic device 21, and replace it with a battery with a lower power state (also called an empty battery or a feeding battery).

[0091] By timely replacing the batteries connected to the photovoltaic equipment through the battery dispatch management module, on the one hand, the health and safety of the fully charged batteries can be effectively guaranteed. On the other hand, the replaced empty batteries can continue to be charged with the electricity generated by the photovoltaic equipment, ensuring the continuous and efficient use of photovoltaic power, thereby improving the energy utilization efficiency of the entire energy replenishment station and achieving stable and optimized operation of the photovoltaic charging and discharging integrated system.

[0092] pass Figure 2 The photovoltaic energy storage system shown can directly connect the photovoltaic equipment to the battery in the energy replenishment station without multiple conversions, reducing the energy conversion links, improving the conversion efficiency and absorption rate of the photovoltaic energy storage system, and simplifying the system structure, with a lower overall cost.

[0093] Furthermore, in some embodiments, in order to enhance the energy utilization rate of photoelectric conversion, the photovoltaic energy storage system may also include a DC / DC converter. The DC / DC converter may be disposed between the photovoltaic device and the switch component, so that the photovoltaic device is connected to the battery through the DC / DC converter and the switch component to charge the battery.

[0094] Among them, the DC / DC converter can be a unidirectional DC / DC converter, which can convert the DC power generated by the photovoltaic equipment into DC power suitable for battery charging. It can cope with the output voltage fluctuation of the photovoltaic equipment, adjust the voltage according to the requirements of each stage of battery charging, and accurately adjust the output current, which can not only meet the requirements of efficient charging, but also prevent overcurrent from damaging the battery.

[0095] Furthermore, the DC / DC converter is configured to match the internal and external impedances of the photovoltaic energy storage system based on a maximum power point tracking strategy so that the operating point of the DC / DC converter is located at a maximum power output position.

[0096] The output power of photovoltaic equipment will change with the changes of light intensity, temperature and other factors, and there is a maximum power output point. The DC / DC converter has the maximum power point tracking (MPPT) function, which can monitor the output voltage and current of photovoltaic equipment in real time through the MPPT control strategy, and achieve the matching of internal and external impedances in the system by constantly adjusting its own working state.

[0097] Among them, the MPPT control strategy is a control strategy that enables photovoltaic equipment to output more electrical energy by adjusting the working state of the electrical module.

[0098] In the system, maximum power transmission can only be achieved when the internal impedance (the equivalent impedance of the photovoltaic device itself) and the external impedance (the equivalent impedance of the circuit connected to the photovoltaic device, such as the DC / DC converter and subsequent circuits) are matched, so that the internal and external impedances of the photovoltaic system are matched, so that the operating point of the DC / DC converter always works at the maximum power point, maximizing the power generation efficiency of the photovoltaic panel.

[0099] In addition, the DC / DC converter can also reduce voltage ripple, improve power quality, and reduce energy loss with higher conversion efficiency, ensuring that photovoltaic power is effectively used for battery charging.

[0100] In some embodiments, see Appendix Figure 3 , Figure 3 It is a main structural diagram of a photovoltaic energy storage system with a common AC bus according to an embodiment of the present application.

[0101] like Figure 3 As shown, the photovoltaic energy storage system includes a photovoltaic device 31, a switch assembly 32 (including a first switch 321 and a second switch 322), multiple batteries 33 (including batteries 331-33n), a battery scheduling management module 34, a DC / DC converter 35, a power grid 36, an AC bus (AC BUS) 37, multiple AC / DC+DC / AC composite modules 38, a power distribution module 39 (Power Distribution Unit, PDU), a bidirectional AC / DC+DC / AC module 310, a unidirectional AC / DC+DC / AC module 311, a V2G charging pile 312 and a unidirectional charging pile 313, etc.

[0102] Among them, one end of the AC bus 37 is connected to the power grid 36, and the other end is connected to one end of multiple AC / DC+DC / AC composite modules 38. The AC / DC+DC / AC composite module 38 integrates the functions of AC / DC and DC / AC, and can realize the conversion of different current forms to meet the needs of different devices in the system for AC and DC power supply, thereby optimizing the power distribution and utilization of the photovoltaic charging and discharging system in the battery swap station.

[0103] One end of the power distribution module 39 is connected to the other end of the multiple AC / DC+DC / AC composite modules 38, and the other end of the power distribution module 39 is connected to the multiple batteries 33. The power distribution module 39 is configured to control the power grid 36 or the photovoltaic device 31 to charge the multiple batteries 33.

[0104] Specifically, the power distribution module 39 can flexibly and accurately control the flow of power according to preset rules and real-time power conditions. For example, the power distribution module 39 can control the first switch 321 to be turned on and the second switch 322 to be turned off, so that the power generated by the photovoltaic device 31 is transmitted to the battery 33n, and the power of the power grid 36 is transmitted to the batteries 331 to 33n-1, so as to ensure that the charging of multiple batteries is not affected, avoid charging the same battery through the power grid 36 and the photovoltaic device 31 at the same time, ensure battery safety, and improve energy utilization efficiency.

[0105] One end of the bidirectional AC / DC+DC / AC module 310 is connected to the AC bus 37 , and the other end is connected to the V2G charging pile 312 ; one end of the unidirectional AC / DC+DC / AC module 311 is connected to the AC bus 37 , and the other end is connected to the unidirectional charging pile 313 .

[0106] Among them, the bidirectional AC / DC+DC / AC composite module 310 can realize bidirectional conversion between AC and DC. It can convert the AC on the AC bus 37 into DC to power the V2G charging pile 312 for charging electric vehicles; it can also operate in reverse, inverting the DC in the V2G charging pile 312 into AC and feeding it back to the AC bus 37, realizing bidirectional conversion.

[0107] The unidirectional AC / DC+DC / AC composite module 311 can obtain AC power through the connected AC bus 37 and convert the AC power into DC power, providing an adaptive power supply for the unidirectional charging pile 313 to meet the unidirectional charging requirements and realize the charging operation of the connected device.

[0108] In addition, if Figure 3 As shown, the photovoltaic energy storage system may also include an anti-backflow control module 314 , an energy management module 315 , a station internal power supply emergency module 316 , and other loads 317 .

[0109] Among them, the station internal power supply emergency module 316 and other loads 317 are connected to the AC bus 37. Other loads 317 refer to various types of electrical equipment or devices connected to the AC bus 37 and consuming electrical energy, in addition to the main loads inside the station, and may specifically include lighting equipment, communication equipment, production equipment, etc., which are not limited here.

[0110] Furthermore, the anti-backflow control module 314 can be used to prevent the backflow of electric energy, ensure that the electric energy flows in the expected direction, and avoid adverse effects on the power grid or the system itself. The energy management module 315 can comprehensively manage the energy within the system and optimize the distribution of electricity between photovoltaic, energy storage and power grids according to real-time conditions. The internal power supply emergency module 316 of the station can obtain energy storage electricity with the help of the AC bus 37 in emergency situations such as mains failure to ensure power supply to key equipment within the station. Other loads 317 are connected to the system through the AC bus 37, consuming the electricity provided by the system to meet the diversified power needs of the station.

[0111] The above is Figure 3 Further description of the photovoltaic energy storage system shown.

[0112] In some embodiments, see Appendix Figure 4 , Figure 4 It is a schematic diagram of the main structure of a photovoltaic energy storage system with a common DC bus according to an embodiment of the present application.

[0113] like Figure 4 As shown, the photovoltaic energy storage system includes a photovoltaic device 41, a switch assembly 42 (including a first switch 421 and a second switch 422), multiple batteries 43 (including batteries 431-43n) and a battery scheduling management module 44, a DC / DC converter 45, a power grid 46, an AC bus (AC BUS) 47, multiple AC / DC modules 48, a DC bus (DC BUS) 49, multiple DC / DC modules 410, a power distribution module 411, a bidirectional DC / DC module 412, a unidirectional DC / DC module 413, a V2G charging pile 414 and a unidirectional charging pile 415, etc.

[0114] Among them, one end of the AC bus 47 is connected to the power grid 46, and the other end is connected to one end of multiple AC / DC modules 48, the other end of the multiple AC / DC modules 48 is connected to one end of the DC bus 49, and the other end of the DC bus 49 is connected to one end of multiple DC / DC modules 410.

[0115] Furthermore, the AC / DC module 48 may be a bidirectional AC / DC module (Bi-AC / DC module), and the DC / DC module 410 may be a bidirectional DC / DC module (Bi-DC / DC module). The AC / DC module 48 is capable of converting alternating current (AC) into direct current (DC), and converting the AC power of the power grid 46 into DC power of suitable voltage and current to meet the requirements of the DC bus 49 or the power requirements of the equipment. The DC / DC module 410 is capable of performing voltage conversion between DC power, and can convert the DC power output by the DC bus 49 into stable DC power that is suitable for charging the battery 43.

[0116] One end of the power distribution module 411 is connected to the other end of the DC / DC modules 410, and the other end of the power distribution module 411 is connected to the batteries 43. The power distribution module 411 is configured to control the grid 46 or the photovoltaic device 41 to charge the batteries 43.

[0117] Specifically, the power distribution module 411 can flexibly and accurately control the flow of power according to preset rules and real-time power conditions. For example, the power distribution module 411 can control the first switch 421 to be turned on and the second switch 422 to be turned off, so that the power generated by the photovoltaic device 41 is transmitted to the battery 43n, and the power of the power grid 46 is transmitted to the batteries 431 to 43n-1, so as to ensure that the charging of multiple batteries is not affected, avoid charging the same battery through the power grid 46 and the photovoltaic device 41 at the same time, ensure battery safety, and improve energy utilization efficiency.

[0118] One end of the bidirectional DC / DC module 412 is connected to the DC bus 49 , and the other end is connected to the V2G charging pile 414 ; one end of the unidirectional DC / DC module 413 is connected to the DC bus 49 , and the other end is connected to the unidirectional charging pile 415 .

[0119] Among them, the bidirectional DC / DC module 412 has the ability of bidirectional energy transmission. It can convert the DC power on the DC bus 49 into a voltage and current level suitable for the V2G charging pile 414 to realize the charging function; it can also convert the DC power output by the V2G charging pile 414 into DC power that meets the requirements of the DC bus 49 when it is necessary to feed back electric energy to the power grid, thereby realizing bidirectional conversion.

[0120] The unidirectional DC / DC module 413 can obtain DC power through the connected DC bus 49, provide an adaptive power supply for the unidirectional charging pile 415, meet the unidirectional charging requirements, and realize the charging operation of the connected device.

[0121] In addition, if Figure 4 As shown, the photovoltaic energy storage system may also include an anti-backflow control module 416 , an energy management module 417 , a station internal power supply emergency module 418 and other loads 419 .

[0122] For the specific working process and related instructions of the anti-backflow control module 416, the energy management module 417, the station internal power supply emergency module 418 and other loads 419, please refer to Figure 3 The contents described in the embodiments of the present invention will not be repeated here.

[0123] The above is Figure 4 Further description of the photovoltaic energy storage system shown.

[0124] Through the above implementation, the DC / DC converter can be controlled according to the maximum power point tracking strategy to achieve internal and external impedance matching of the photovoltaic energy storage system, so that the operating point of the DC / DC converter is always located at the maximum output power position, further enhancing the energy utilization rate of photoelectric conversion. At the same time, through the scheduling of batteries in the energy replenishment station, the photovoltaic energy storage system can be fully self-used. Through the integration of light storage, charging, discharging and switching, the operating cost of the entire energy replenishment station is greatly reduced.

[0125] The above is a description of the photovoltaic energy storage system provided in this application.

[0126] Furthermore, the present application also provides a control method for the above photovoltaic energy storage system.

[0127] See attached Figure 5 , Figure 5 FIG. 1 is a flow chart of the main steps of a control method for a photovoltaic energy storage system according to an embodiment of the present application. Figure 5 As shown, it mainly includes the following steps S501 to S502.

[0128] Step S501: controlling the switch component to be turned on or off to control the photovoltaic device to charge the connected battery;

[0129] The switch component connects the photovoltaic device and the battery, and can control the on and off of the circuit according to the system's instructions. When the system requires the photovoltaic device to charge the battery, the switch component can be controlled to conduct, so that the electricity generated by the photovoltaic device can be transmitted to the battery through the conducting circuit, thereby charging the battery. When charging is not required or abnormal conditions occur, such as battery overcharge risk, photovoltaic device failure, etc., the switch component can be controlled to cut off, stopping the photovoltaic device from transmitting electricity to the battery, ensuring the safe and stable operation of the system.

[0130] Step S502: When the battery connected to the photovoltaic device is fully charged, the fully charged battery is replaced with other feeding batteries through the battery scheduling management module.

[0131] Specifically, the battery scheduling management module in the system will monitor the power status of the battery connected to the photovoltaic equipment in real time. When it is detected that the battery is fully charged, it will move the fully charged battery from the charging position connected to the photovoltaic equipment according to the preset strategy and procedure, and replace other batteries in the feeding state (such as low power or needing to be charged) to the charging position. Ensure that the photovoltaic equipment charges the battery continuously and efficiently, improve the energy utilization efficiency of the entire photovoltaic energy storage system, and ensure that the system always has available fully charged batteries for subsequent use.

[0132] Furthermore, in some embodiments, the DC / DC converter can be controlled based on a maximum power point tracking strategy to match the internal and external impedances of the photovoltaic energy storage system so that the operating point of the DC / DC converter is at the maximum power output position.

[0133] Specifically, in a photovoltaic energy storage system, the output power of the photovoltaic device will change with light and temperature. The maximum power point tracking strategy aims to dynamically adjust the DC / DC converter so that the photovoltaic device always outputs the maximum power.

[0134] When the DC / DC converter is working, it is necessary to match the internal and external impedance of the system so that the operating point falls at a position where the photovoltaic device can output the maximum power. At this time, the electric energy generated by the photovoltaic device is efficiently transmitted, thereby improving the power generation efficiency of the system and optimizing the performance of the photovoltaic energy storage system.

[0135] Based on the above control method, the DC / DC converter can be controlled through the maximum power point tracking strategy to achieve internal and external impedance matching of the photovoltaic energy storage system, so that the operation point of the DC / DC converter is always at the maximum output power position, and the energy utilization rate of photoelectric conversion is enhanced. At the same time, through the scheduling of the batteries in the energy replenishment station, the photovoltaic energy storage system is fully self-used, and the operation cost of the entire energy replenishment station is greatly reduced through the integration of photovoltaic storage, charging, discharging and switching.

[0136] The above is a further explanation of the control method of the photovoltaic energy storage system provided in this application.

[0137] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effect of the present application, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present application.

[0138] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above-mentioned embodiment of the present application can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program code.

[0139] Furthermore, the present application also provides an electronic device. Figure 6 , Figure 6 Schematic diagram of the main structure of an electronic device according to an embodiment of the present application. Figure 6 As shown, the electronic device in the embodiment of the present application mainly includes a processor 61 and a memory 62. The memory 62 can be configured to store a program for executing the control method of the photovoltaic energy storage system of the above method embodiment, and the processor 61 can be configured to execute the program in the memory 62, which includes but is not limited to the program for executing the control method of the photovoltaic energy storage system of the above method embodiment. For the convenience of explanation, only the part related to the embodiment of the present application is shown. For the specific technical details not disclosed, please refer to the method part of the embodiment of the present application.

[0140] In some possible implementations of the present application, the electronic device may include multiple processors 61 and multiple memories 62. The program for executing the control method of the photovoltaic energy storage system of the above method embodiment may be divided into multiple subprograms, and each subprogram may be loaded and run by the processor 61 to execute different steps of the control method of the photovoltaic energy storage system of the above method embodiment. Specifically, each subprogram may be stored in different memories 62, and each processor 61 may be configured to execute programs in one or more memories 62 to jointly implement the control method of the photovoltaic energy storage system of the above method embodiment, that is, each processor 61 executes different steps of the control method of the photovoltaic energy storage system of the above method embodiment to jointly implement the control method of the photovoltaic energy storage system of the above method embodiment.

[0141] The above-mentioned multiple processors 61 may be processors deployed on the same device. For example, the above-mentioned electronic device may be a high-performance device composed of multiple processors, and the above-mentioned multiple processors 61 may be processors configured on the high-performance device. In addition, the above-mentioned multiple processors 61 may also be processors deployed on different devices. For example, the above-mentioned electronic device may be a server cluster, and the above-mentioned multiple processors 61 may be processors on different servers in the server cluster.

[0142] Furthermore, the present application also provides a computer-readable storage medium. In a computer-readable storage medium embodiment according to the present application, the computer-readable storage medium can be configured to store a program for executing the control method of the photovoltaic energy storage system of the above-mentioned method embodiment, and the program can be loaded and run by the processor to implement the control method of the above-mentioned photovoltaic energy storage system. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The computer-readable storage medium can be a memory device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present application is a non-temporary computer-readable storage medium.

[0143] It should be noted that the relevant user personal information that may be involved in the various embodiments of the present application is strictly in accordance with the requirements of laws and regulations, following the principles of legality, legitimacy and necessity, based on the reasonable purposes of business scenarios, to process the personal information that users actively provide during the use of products / services or generated due to the use of products / services, as well as the personal information obtained with the user's authorization.

[0144] The user personal information processed by this application will vary depending on the specific product / service scenario, and shall be based on the specific scenario in which the user uses the product / service, and may involve the user's account information, device information, station information, vehicle information or other related information. This application will treat the user's personal information and its processing with a high degree of diligence.

[0145] This application attaches great importance to the security of user personal information and has taken reasonable and feasible security protection measures that meet industry standards to protect user information and prevent personal information from being accessed, disclosed, used, modified, damaged or lost without authorization.

[0146] So far, the technical solution of the present application has been described in conjunction with an embodiment shown in the accompanying drawings, but 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. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A photovoltaic energy storage system, applied to an energy replenishment station, characterized in that: The photovoltaic energy storage system includes photovoltaic equipment, a switch assembly, multiple batteries and a battery scheduling management module; Wherein, the photovoltaic device is connected to the battery via the switch assembly, and the photovoltaic device is configured to charge the battery; The switch assembly is configured to switch on or off the connection between the photovoltaic device and the battery; The battery scheduling management module is configured to replace the battery connected to the photovoltaic device.

2. The photovoltaic energy storage system according to claim 1, characterized in that: The photovoltaic energy storage system also includes a DC / DC converter; The DC / DC converter is arranged between the photovoltaic device and the switch component, and the photovoltaic device is connected to the battery through the DC / DC converter and the switch component; The DC / DC converter is configured to match the internal and external impedances of the photovoltaic energy storage system based on a maximum power point tracking strategy so that the operating point of the DC / DC converter is located at a maximum power output position.

3. The photovoltaic energy storage system according to claim 2, characterized in that: The photovoltaic energy storage system also includes a power grid, an AC bus, a plurality of AC / DC+DC / AC composite modules or a plurality of AC / DC modules; One end of the AC bus is connected to the power grid, and the other end is connected to one end of the multiple AC / DC+DC / AC composite modules or multiple AC / DC modules.

4. The photovoltaic energy storage system according to claim 3, characterized in that: The photovoltaic energy storage system also includes a DC bus and a plurality of DC / DC modules; When the other end of the AC bus is connected to one end of the multiple AC / DC modules, the other end of the multiple AC / DC modules is connected to one end of the DC bus; The other end of the DC bus is connected to one end of the plurality of DC / DC modules.

5. The photovoltaic energy storage system according to claim 3 or 4, characterized in that: The photovoltaic energy storage system also includes a power distribution module; One end of the power distribution module is connected to the other end of the multiple AC / DC+DC / AC composite modules or the multiple DC / DC modules, and the other end of the power distribution module is connected to the multiple batteries; The power distribution module is configured to control the power grid or the photovoltaic device to charge the plurality of batteries.

6. The photovoltaic energy storage system according to claim 3, characterized in that: The photovoltaic energy storage system also includes a bidirectional AC / DC+DC / AC module, a unidirectional AC / DC+DC / AC module, a V2G charging pile and a unidirectional charging pile; One end of the bidirectional AC / DC+DC / AC module is connected to the AC bus, and the other end is connected to the V2G charging pile; One end of the unidirectional AC / DC+DC / AC module is connected to the AC bus, and the other end is connected to the unidirectional charging pile.

7. The photovoltaic energy storage system according to claim 4, characterized in that: The photovoltaic energy storage system also includes a bidirectional DC / DC module, a unidirectional DC / DC module, a V2G charging pile and a unidirectional charging pile; One end of the bidirectional DC / DC module is connected to the DC bus, and the other end is connected to the V2G charging pile; One end of the unidirectional DC / DC module is connected to the DC bus, and the other end is connected to the unidirectional charging pile.

8. The photovoltaic energy storage system according to any one of claims 1 to 4, characterized in that: The photovoltaic energy storage system also includes an anti-backflow control module, an energy management module, a station internal power supply emergency module and other loads; The station internal power supply emergency module and other loads are connected to the AC bus.

9. A control method for a photovoltaic energy storage system according to any one of claims 1 to 8, characterized in that: The method comprises: Control the switch component to turn on or off to control the photovoltaic device to charge the connected battery; When the battery connected to the photovoltaic device is fully charged, the fully charged battery is replaced with other feeding batteries through the battery scheduling management module.

10. The control method of the photovoltaic energy storage system according to claim 9, characterized in that: The method further comprises: The DC / DC converter is controlled based on a maximum power point tracking strategy to match the internal and external impedances of the photovoltaic energy storage system so that the operating point of the DC / DC converter is located at the maximum power output position.

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