Photovoltaic power generation equipment

Abstract

The utility model discloses photovoltaic power generation equipment, and relates to the technical field of light storage all-in-one machines. The photovoltaic power generation equipment comprises a machine shell, a photovoltaic power generation module and a power supply module, the bidirectional PCS inverter is arranged in the machine shell; the first DC-DC conversion module is arranged in the machine shell and is electrically connected with the bidirectional PCS inverter; the second DC-DC conversion module and the first DC-DC conversion module are arranged in the shell in parallel, and the second DC-DC conversion module is electrically connected with the bidirectional PCS inverter; the first battery pack is electrically connected with the first DC-DC conversion module and the second DC-DC conversion module respectively; and the plurality of photovoltaic modules are respectively connected with the first DC-DC conversion module and the second DC-DC conversion module. According to the utility model, the problems that several scenes of mobile energy storage, light storage grid connection and variable flow energy storage management cannot be satisfied at the same time, and the cost performance cannot be high in each scene are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated photovoltaic and storage devices, and in particular to photovoltaic power generation equipment. Background Art

[0002] With the development of the energy storage market, more and more integrated energy storage devices have been favored by the market. For small energy storage products, people have higher expectations for their versatility, and expect the same product to be able to meet the needs of multiple scenarios at the same time, saving overall expenses and saving product space while being able to be used in multiple scenarios.

[0003] Currently, the market has three main types of small-capacity (500Wh-10kWh) and small-power (500W-4KW) products: 1. Mobile energy storage, whose main functions are: off-grid discharge; photovoltaic power generation, USB ports, cigarette lighter ports and other interfaces required for outdoor activities; as a home backup power source, it has UPS function.

[0004] Its disadvantages are: no small photovoltaic energy storage grid-connected integrated machine function; many interfaces lead to high design costs such as waterproofing, so it is generally not recommended for outdoor use; converter energy storage integrated machine function.

[0005] 2. Small photovoltaic storage grid-connected integrated machine, its main function is: photovoltaic power generation grid-connected, usually placed outdoors.

[0006] Its disadvantages are: no mobile energy storage function; no integrated converter energy storage function.

[0007] 3. The main function of the integrated converter and energy storage device is to achieve energy management.

[0008] Its disadvantages are: no photovoltaic energy storage grid connection function and no mobile energy storage function. There is no effective solution to the above problems. Utility Model Content

[0009] Purpose of the utility model: to provide a photovoltaic power generation device to solve the above-mentioned problems existing in the prior art.

[0010] Technical solution: A photovoltaic power generation device, comprising: a casing; a bidirectional PCS inverter, arranged in the casing; a first DC-DC conversion module, arranged in the casing and electrically connected to the bidirectional PCS inverter; a second DC-DC conversion module, arranged in parallel with the first DC-DC conversion module in the casing and electrically connected to the bidirectional PCS inverter; a first battery pack, electrically connected to the first DC-DC conversion module and the second DC-DC conversion module respectively; and a plurality of photovoltaic components, connected to the first DC-DC conversion module and the second DC-DC conversion module respectively; wherein the bidirectional PCS inverter is connected to the power grid and the load through the first external interface and the second external interface respectively, and is adjusted through the switches of the first external interface and the second external interface so that the photovoltaic storage integrated machine has the function of being connected to and off the grid.

[0011] Preferably, the bidirectional PCS inverter comprises: a shell, in which a bidirectional DC-AC conversion module and a third DC-DC conversion module are respectively arranged, and the bidirectional DC-AC conversion module is electrically connected to the third DC-DC conversion module.

[0012] Preferably, the bidirectional DC-AC conversion module is a bidirectional DC-AC converter for bidirectional direct current to alternating current, and the third DC-DC conversion module is a bidirectional DC-DC converter for bidirectional direct current to direct current.

[0013] Preferably, the shell is provided with a first external interface and a second external interface, respectively, and the first external interface and the second external interface are electrically connected to the bidirectional DC-AC conversion module respectively.

[0014] Preferably, the first external interface is a grid access terminal, the second external interface is an AC output port, and the first external interface and the second external interface are waterproof interfaces.

[0015] Preferably, the first DC-DC conversion module is a unidirectional DC-DC converter, and a third external interface is provided on the first DC-DC conversion module, and the third external interface is a photovoltaic input port, namely, PV input, and the third external interface is a waterproof interface.

[0016] Preferably, the second DC-DC conversion module is a bidirectional DC-DC converter so that the optical storage integrated machine has dual purposes; the second DC-DC conversion module is provided with a fourth external interface, which is a DC input / output port, namely DC In / Out, and is a waterproof interface.

[0017] Preferably, the device further comprises: a second battery pack, wherein the second battery pack is electrically connected to the first battery pack.

[0018] Preferably, when the photovoltaic and storage integrated machine is in on-grid or off-grid use, the first external interface is connected to the grid through a distribution box, the second external interface is connected to the load, and the third external interface and the fourth external interface are electrically connected to the photovoltaic components respectively.

[0019] Preferably, when the photovoltaic energy storage machine is in a mobile energy storage usage state, the first external interface is connected to the power grid through a power connector, the second external interface is connected to the terminal board for the AC external interface, the third external interface is connected to the DC external interface board, and the fourth external interface is electrically connected to the photovoltaic panel.

[0020] Preferably, when the integrated photovoltaic and storage device is in EPS usage state, the first external interface is connected to the power grid through a distribution box, the first battery pack is connected to the first external interface through the bidirectional PCS inverter, and the second external interface is connected to the load, so that the bidirectional PCS inverter continues to supply power to the load.

[0021] Preferably, the second DC-DC conversion module includes: a power conversion circuit, which includes: a first power switch tube and a second power switch tube arranged in series at both ends of the first battery pack, one end of an inductor is arranged between the first power switch tube and the second power switch tube, and the other end of the inductor is arranged between a third power switch tube and a fourth power switch tube arranged in series, and both ends of the third power switch tube and the fourth power switch tube are respectively connected to a fourth external interface.

[0022] Preferably, when the fourth external interface is connected to the photovoltaic input, energy flows from the fourth external interface into the first battery pack. At this time, the power conversion circuit acts as an MPPT circuit to track the maximum photovoltaic power and samples the PACK+ voltage as an output control loop to control the maximum charging battery voltage.

[0023] Preferably, when the fourth external interface is connected to an external electrical device, energy flows from the first battery pack into the fourth external interface. At this time, the power conversion circuit acts as a constant voltage power limiting circuit, samples the voltage of the fourth external interface as an output control loop, controls the constant voltage output of the fourth external interface, and obtains a preset voltage value.

[0024] Beneficial effect: In the embodiment of the present application, a photovoltaic and energy storage integrated machine is adopted, and the bidirectional PCS inverter is connected to the power grid and the load through the first external interface and the second external interface respectively, and the first external interface and the second external interface switch are adjusted to enable the photovoltaic and energy storage integrated machine to have the function of grid connection and off-grid connection, thereby achieving the purpose of grid connection and off-grid integration, thereby realizing the technical effect of practicality and flexibility of the photovoltaic and energy storage integrated machine, and further solving the problems that the existing energy storage equipment does not have the function of a small photovoltaic and energy storage grid-connected integrated machine, and the large number of interfaces leads to high design costs such as waterproofing, so it is generally not recommended for outdoor use; small photovoltaic and energy storage grid-connected integrated machine, without mobile energy storage function; without converter energy storage integrated machine function; and the converter energy storage integrated machine has no photovoltaic and energy storage grid-connected function and no mobile energy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a photovoltaic power generation device of the utility model;

[0026] Figure 2 This is a schematic diagram of a photovoltaic power generation device used in an on-grid and off-grid structure of the utility model;

[0027] Figure 3 This is a schematic diagram of a photovoltaic power generation device used in a mobile energy storage structure of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of a photovoltaic power generation device of the utility model applied to an off-grid scenario and equipped with a battery pack;

[0029] Figure 5 This is a schematic diagram of the structure of a photovoltaic power generation device of the utility model applied to a mobile energy storage scenario and equipped with a battery pack;

[0030] Figure 6 The utility model discloses an electrical diagram of a power conversion circuit of a photovoltaic power generation device.

[0031] The accompanying drawings are marked as follows: 1. casing; 2. bidirectional PCS inverter; 21. shell; 22. bidirectional DC-AC conversion module; 23. third DC-DC conversion module; 24. first external interface; 25. second external interface; 3. first DC-DC conversion module; 31. third external interface; 4. second DC-DC conversion module; 41. fourth external interface; 5. first battery pack; 6. second battery pack; 7. distribution box; 8. power grid; 9. load; 10. photovoltaic module; 11. power connector; 12. terminal block; 13. DC external interface board; 14. photovoltaic panel. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] like Figure 1 As shown, the present application relates to a photovoltaic power generation device. The photovoltaic power generation device includes: a housing 1; the housing 1 refers to the machine housing of the photovoltaic storage integrated machine, which can achieve the effect of accommodating and protecting other components well, and can also achieve the effect of assembling and matching other components, thereby achieving multiple functions. Of course, it should be known that the housing 1 has a certain level of protection, so that it has the effect of waterproof and dustproof; and other related performances, such as heat dissipation.

[0037] The bidirectional PCS inverter 2 is arranged in the housing 1; the bidirectional PCS inverter 2 is a power conversion system capable of realizing bidirectional power conversion. PCS (Power Conversion System) refers to a device that can convert electrical energy from one form to another, in which the inverter is a key component. Among them, "bidirectional" means that this inverter has the bidirectional function of converting direct current into alternating current (inversion) and converting alternating current into direct current (rectification). In the present application, the bidirectional PCS inverter 2 can achieve the effects of off-grid and AC output.

[0038] The first DC-DC conversion module 3 is arranged in the housing 1 and is electrically connected to the bidirectional PCS inverter 2; by fixing the first DC-DC conversion module 3 in the housing 1, a good assembly effect can be achieved, thereby ensuring a stable installation effect; at the same time, by electrically connecting the first DC-DC conversion module 3 to the bidirectional PCS inverter 2, a good electrical connection effect can be achieved, thereby achieving a good power transmission effect between modules; at the same time, by adjusting the current, voltage or power of the input DC voltage, the required different voltage levels can be output, thereby realizing functions such as boosting, bucking, and buck-boosting between DC power supplies.

[0039] The second DC-DC conversion module 4 is arranged in parallel with the first DC-DC conversion module 3 in the housing 1, and is electrically connected to the bidirectional PCS inverter 2; by fixing the second DC-DC conversion module 4 in the housing 1, a good assembly effect can be achieved, thereby ensuring a stable installation effect; at the same time, the second DC-DC conversion module 4 is arranged in parallel with the first DC-DC conversion module 3, which can achieve multiple functional effects and achieve a good power transmission effect between modules;

[0040] The first battery pack 5 is electrically connected to the first DC-DC conversion module 3 and the second DC-DC conversion module 4 respectively; by providing the first battery pack 5, a good energy storage effect can be achieved.

[0041] A plurality of photovoltaic components 10 are respectively connected to the first DC-DC conversion module 3 and the second DC-DC conversion module 4; by electrically connecting a plurality of photovoltaic components to the first DC-DC conversion module 3 and the second DC-DC conversion module 4, respectively, a good power supply effect can be achieved, thereby ensuring a stable power supply effect.

[0042] The bidirectional PCS inverter 2 is connected to the power grid 8 and the load 9 through the first external interface 24 and the second external interface 25 respectively, and is switched by adjusting the first external interface 24 and the second external interface 25 so that the photovoltaic storage integrated machine has the function of being on and off the grid.

[0043] like Figure 2 As shown, when the photovoltaic storage integrated machine is in the on-grid and off-grid use state, the first external interface 24 is connected to the power grid 8 through the distribution box 7, the second external interface 25 is connected to the load 9, and the third external interface 31 and the fourth external interface 41 are electrically connected to the photovoltaic module 10 respectively. It can be understood that when the photovoltaic storage integrated machine is used for off-grid and on-grid functions, in this scenario, users are more concerned about the amount of photovoltaic power generation. At this time, the photovoltaic module 10 (photovoltaic panel 14) can be input from two optical DC / DC ports at the same time, and the DC In / Out and PV input are connected to the photovoltaic module 10 (photovoltaic panel 14) at the same time. The electricity generated by the photovoltaic module 10 (photovoltaic panel 14) charges the battery pack, and the inverter output is connected to the grid through the AC Grid port, and the important load 9 is powered by the AC output. If there is only a need for grid connection alone, you only need to turn off the AC output, which is very convenient to use.

[0044] Furthermore, the first DC-DC conversion module 3 is a unidirectional DC-DC converter, and the second DC-DC conversion module 4 is a bidirectional DC-DC converter, so that the integrated optical storage device has multiple uses. The first DC-DC conversion module 3 is a unidirectional DC / DC converter, which is a power conversion device that can achieve unidirectional power flow, that is, converting the direct current of one power source into the direct current required by another power source. Of course, the first DC-DC conversion module 3 can also be a bidirectional DC-DC converter, which can achieve the effects of multiple functions, thereby meeting the effects of multiple usage scenarios, and further achieving the effect of further improving the practicality of the integrated optical storage device.

[0045] The second DC-DC conversion module 4 is a bidirectional DC / DC converter, which is a power conversion device with bidirectional power flow capability, and can realize bidirectional energy conversion between DC power supplies. The converter can transfer electric energy from one power supply to another power supply, and can realize the function of boosting, bucking or buck-boosting between the two power supplies.

[0046] Specifically, power flows in both directions: the converter can accept DC power from one source and convert it to DC power for another source. Likewise, it can operate in reverse, transferring power from one source to another.

[0047] In energy storage systems, bidirectional DC / DC converters are widely used. For example, they can be used to connect battery energy storage systems and the power grid 8 to achieve battery charging and discharging, while participating in balancing the needs of the power system.

[0048] Power system stability: Bidirectional DC / DC converters can also be used to improve the stability of power systems. In applications such as microgrids8, they can help balance the power demand on the power system.

[0049] Therefore, the bidirectional DC-DC converter has the characteristics of high efficiency, fast response, and adjustable output, thus being able to meet the usage requirements of various scenarios.

[0050] This application can simultaneously meet the needs of mobile energy storage, photovoltaic storage grid connection, and power conversion energy storage management, and can have a high cost-effectiveness in each scenario; A. It can realize the function of outdoor mobile energy storage by adding a DC distribution board; B. It can be used as a grid-connected photovoltaic storage all-in-one machine to realize photovoltaic power generation grid connection; C. It can be used as a storage power conversion (PCS) all-in-one machine to realize energy management.

[0051] The optical storage integrated machine and its accessories in this application can meet the needs of various usage scenarios.

[0052] In the present application, the first DC-DC conversion module 3 is a unidirectional DC-DC converter, and the second DC-DC conversion module 4 is a bidirectional DC-DC converter, so that the integrated photovoltaic and storage machine has multiple uses, achieving the purpose of being multi-purpose and meeting the purpose of various usage scenarios, thereby realizing the technical effect of the practicality and flexibility of the integrated photovoltaic and storage machine.

[0053] Specifically, the present application utilizes a set of bidirectional DC / DC converters to realize different functions when used in different scenarios. It can be connected to DC board accessories to realize external user interface and meet the needs of rich interfaces. It can be used as the input port of the photovoltaic panel 14 to increase the photovoltaic power generation power of the all-in-one machine.

[0054] From the above description, it can be seen that the present application achieves the following technical effects:

[0055] In the embodiment of the present application, a photovoltaic and energy storage integrated machine is adopted, and the bidirectional PCS inverter is connected to the power grid and the load through the first external interface and the second external interface respectively, and the first external interface and the second external interface switch are adjusted to enable the photovoltaic and energy storage integrated machine to have the function of grid connection and off-grid connection, thereby achieving the purpose of grid connection and off-grid integration, thereby realizing the technical effect of practicality and flexibility of the photovoltaic and energy storage integrated machine, and further solving the problems that the existing energy storage equipment does not have the function of a small photovoltaic and energy storage grid-connected integrated machine, and the large number of interfaces leads to high design costs such as waterproofing, so it is generally not recommended for outdoor use; small photovoltaic and energy storage grid-connected integrated machine, without mobile energy storage function; without converter energy storage integrated machine function; and the converter energy storage integrated machine has no photovoltaic and energy storage grid-connected function and no mobile energy storage.

[0056] Further, the bidirectional PCS inverter 2 includes: a housing 21, in which a bidirectional DC-AC conversion module 22 and a third DC-DC conversion module 23 are respectively arranged, and the bidirectional DC-AC conversion module 22 is electrically connected to the third DC-DC conversion module 23. It can be understood that by integrating the bidirectional DC-AC conversion module 22 and the third DC-DC conversion module 23 in the housing 21, the effect of bidirectional energy conversion can be achieved, so that the energy interaction effect with the power grid 8 or important load 9 can be achieved; for example: conversion between DC and AC or DC and DC.

[0057] Furthermore, the bidirectional DC-AC conversion module 22 is a bidirectional DC-AC converter for bidirectional direct current to alternating current, and the third DC-DC conversion module 23 is a bidirectional DC-DC converter for bidirectional direct current to direct current. It can be understood that a bidirectional DC-AC converter is a device that can realize bidirectional energy conversion between a direct current (DC) power supply and an alternating current (AC) power supply. In the process of converting a DC power supply to an AC power supply, an inverter has a step-up and step-down function and allows current to flow in two directions.

[0058] Specifically, bidirectional energy flow: A bidirectional DC-AC converter has the ability to convert DC power to AC power (inversion) and AC power to DC power (rectification), making it suitable for applications that require power conversion in both directions.

[0059] Energy storage system: In the energy storage system, a bidirectional DC-AC converter is used to connect the battery energy storage system and the grid 8. It can boost the DC power of the battery to AC power for use in the grid 8, and it can also step down the AC power of the grid 8 to charge the battery.

[0060] Renewable Energy Systems: In solar energy systems, bidirectional DC-AC converters are used to connect the direct current generated by renewable energy and convert it into the alternating current required by the grid 8.

[0061] Microgrid 8: In microgrid 8, bidirectional DC-AC converters can coordinate local renewable energy and energy storage systems to inject energy into or extract energy from the grid 8 as needed.

[0062] Power system backup power: The bidirectional DC-AC converter can convert the DC power in the energy storage system into AC power when the grid is out of power, providing backup power for key equipment.

[0063] Of course, it is important to know that converters are usually composed of switching power components (such as transistors, inductors, capacitors, etc.) and control circuits. When selecting and designing a bidirectional DC-AC converter, it is necessary to consider factors such as system power requirements, efficiency, voltage levels, and stability. Therefore, converters play a key role in renewable energy, energy storage systems, electric transportation, and other fields.

[0064] Furthermore, the housing 21 is provided with a first external interface 24 and a second external interface 25, respectively, and the first external interface 24 and the second external interface 25 are respectively electrically connected to the bidirectional DC-AC conversion module 22. It can be understood that by providing the first external interface 24 and the second external interface 25 on the housing 21, a good electrical connection effect with the bidirectional DC-AC conversion module 22 can be achieved, and at the same time, a good external connection effect can be achieved, thereby achieving a good input or output effect of the optical storage integrated machine.

[0065] Further, the first external interface 24 is a grid access terminal, i.e., AC Grid, the second external interface 25 is an AC output port, i.e., AC output, and the first external interface 24 and the second external interface 25 are waterproof interfaces. It can be understood that by setting the interface to a variety of corresponding ports, multiple functional effects can be achieved. At the same time, the use of a waterproof interface can also achieve a good waterproof effect, thereby achieving an effect of increasing the service life.

[0066] Furthermore, the first DC-DC conversion module 3 is provided with a third external interface 31, which is a photovoltaic input port and a waterproof interface. It can be understood that by setting the third interface as a photovoltaic input port, a good adaptation effect with the photovoltaic group can be achieved, thereby achieving a good input effect of the power supply of the photovoltaic assembly 10; at the same time, the use of a waterproof interface can also achieve a good waterproof effect, thereby achieving an effect of increasing the service life.

[0067] Furthermore, the second DC-DC conversion module 4 is provided with a fourth external interface 41, which is a DC input / output port and a waterproof interface. It can be understood that a good DC input or output effect can be achieved, so that it can be used in conjunction with a variety of components; at the same time, the use of a waterproof interface can also achieve a good waterproof effect, thereby achieving an effect of increasing the service life.

[0068] like Figure 4-5As shown, it also includes: a second battery pack 6, which is electrically connected to the first battery pack 5. It can be understood that in different usage scenarios, by adding a second battery pack 6, the effect of increasing the capacity can be achieved, thereby improving the electrical storage capacity, and thus meeting the usage requirements. Of course, a second battery pack can be added according to actual usage requirements to ensure good power supply and storage effects.

[0069] like Figure 3 As shown, when the photovoltaic energy storage device is in the mobile energy storage usage state, the first external interface 24 is connected to the power grid 8 through the power connector 11, the second external interface 25 is connected to the terminal board 12 for the AC external interface, the third external interface 31 is connected to the DC external interface board 13, and the fourth external interface 41 is electrically connected to the photovoltaic panel 14.

[0070] Specifically, when the photovoltaic energy storage device is in the mobile energy storage use state, users in this scenario are more concerned about the rich interfaces, convenient charging, and can be used as a home backup power supply with UPS function. It should be noted that UPS (Uninterruptible Power Supply) is a power supply device used to provide continuous power supply to prevent power outages or power fluctuations from affecting the equipment. When used as a UPS, in this scenario, PV input serves as the input interface of the photovoltaic panel 14 to meet the needs of part of the photovoltaic power generation, and DC In / Out serves as the output to power the DC external interface board 13 to meet the needs of rich interfaces. The AC Grid port is connected to a live socket and can be charged directly to achieve charging convenience. The AC output can be connected to the wiring board 12 to achieve a rich AC external interface. Among them, the photovoltaic panel 14 is a handheld photovoltaic panel 14, which can achieve the effect of easy and flexible use. The power connector 11 is a socket, which can achieve the effect of easy plugging and unplugging and power extraction. The wiring board 12 is a number of AC external sockets. The DC external interface board 13 includes but is not limited to: USB-C, USB-A, cigarette lighter port, DC5521 port, Anderson port, wireless charging port, etc.

[0071] Furthermore, when the photovoltaic and storage integrated machine is in EPS usage state, the first external interface is connected to the power grid through the distribution box, the first battery pack is connected to the first external interface through the bidirectional PCS inverter, and the second external interface is connected to the load, so that the bidirectional PCS inverter continues to supply power to the load.

[0072] Specifically, when the photovoltaic storage integrated machine is used as EPS, the AC output is connected to the important load 9. When the grid 8 has power, the AC Grid port is used to charge the internal battery pack (PACK) of the machine through the bidirectional inverter PCS, while the important load 9 is discharged through the AC output; when the grid 8 is abnormal, the inverter PCS works in inversion mode to continuously supply power to the important load 9 to realize the EPS function. It should be noted that EPS (Emergency Power Supply) is a backup power supply system used in emergency situations, usually used to provide short-term power support to ensure that key equipment can still operate normally during power outages.

[0073] Furthermore, the DC external interface board 13 and the AC external socket are not limited to those with wires, but can also be a component that is directly plugged into the same machine. Customers can purchase them according to their needs, and different AC external sockets can be equipped according to the different types of electrical appliances in different countries.

[0074] like Figure 6 As shown, the second DC-DC conversion module includes: a power conversion circuit, the power conversion circuit includes: a first power switch tube and a second power switch tube arranged in series at both ends of the first battery pack, one end of an inductor is arranged between the first power switch tube and the second power switch tube, the other end of the inductor is arranged between a third power switch tube and a fourth power switch tube arranged in series, and both ends of the third power switch tube and the fourth power switch tube are respectively connected to a fourth external interface.

[0075] Furthermore, when the fourth external interface is connected to the photovoltaic input, energy flows from the fourth external interface into the first battery pack. At this time, the power conversion circuit acts as an MPPT circuit to track the maximum photovoltaic power and samples the PACK+ voltage as an output control loop to control the maximum charging battery voltage.

[0076] Furthermore, when the fourth external interface is connected to an external power-consuming device, energy flows from the first battery pack into the fourth external interface. At this time, the power conversion circuit acts as a constant voltage power limiting circuit, samples the voltage of the fourth external interface as an output control loop, controls the constant voltage output of the fourth external interface, and obtains a preset voltage value.

[0077] Specifically, Figure 6A circuit of a second DC-DC conversion module, namely Bi DC / DC, for a fourth external interface, namely DC In / Out, and connecting Bi DC / DC to DC In / Out at the same time; the power conversion circuit includes: a first power switch tube M1, a second power switch tube M2, a third power switch tube M3, a fourth power switch tube M4 and an inductor L1 to form a BUCK-boost circuit; and also includes: a control circuit, which is electrically connected to the first power switch tube M1, the second power switch tube M2, the third power switch tube M3, and the fourth power switch tube M4 respectively. The control circuit receives battery voltage feedback and output voltage feedback to send out precise control signals to control the actions of several power switch tubes.

[0078] The connection relationship between the corresponding components is as follows: the first end of the first capacitor C1 is connected to the drain of the second power switch tube M2, and the first end of the first capacitor C1 is used to connect to the positive electrode of the first battery pack, and the second end is connected to the negative electrode of the first battery pack; the source of the second power switch tube M2 is connected to the drain of the first power switch tube M1 and one end of the inductor L1; the other end of the inductor L1 is connected to the source of the fourth power switch tube M4 and the drain of the third power switch tube M3, and the drain of the fourth power switch tube M4 is connected to the first end of the second capacitor C2 and DC In / Out; the source of the third power switch tube M3 is connected to the second end of the second capacitor C2. The source of the first power switch tube M1 is connected to the second end of the first capacitor C1.

[0079] When DC In / Out is connected to photovoltaic input, energy flows from DC In / Out to PACK. At this time, BUCK-boost acts as an MPPT circuit to track the maximum photovoltaic power and samples the PACK+ voltage as an output control loop to control the maximum charging battery voltage.

[0080] When DC In / Out is connected to an external power device, energy flows from PACK into DC In / Out. At this time, BUCK-boost acts as a constant voltage power limiting circuit, sampling the DC In / Out voltage as an output control loop to control the DC In / Out constant voltage output and obtain the expected voltage value.

[0081] Of course, this function is not limited to the BUCK-boost circuit. It can be a forward BUCK, reverse BOOST circuit, a forward BOOST, reverse BUCK circuit, or other bidirectional DC / DC circuits. In this application, there is no limitation on this.

[0082] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. Photovoltaic power generation equipment, characterized in that include: chassis; A bidirectional PCS inverter is disposed in the housing; a first DC-DC conversion module, disposed in the housing and electrically connected to the bidirectional PCS inverter; a second DC-DC conversion module, arranged in parallel with the first DC-DC conversion module in the housing, and electrically connected to the bidirectional PCS inverter; A first battery pack is electrically connected to the first DC-DC conversion module and the second DC-DC conversion module respectively; and A plurality of photovoltaic modules are respectively connected to the first DC-DC conversion module and the second DC-DC conversion module; The bidirectional PCS inverter is connected to the power grid and the load through the first external interface and the second external interface respectively, and is adjusted through the switches of the first external interface and the second external interface so that the photovoltaic storage integrated machine has the function of being on and off the grid.

2. The photovoltaic power generation device according to claim 1, characterized in that: The bidirectional PCS inverter comprises: a shell, in which a bidirectional DC-AC conversion module and a third DC-DC conversion module are respectively arranged, and the bidirectional DC-AC conversion module is electrically connected to the third DC-DC conversion module.

3. The photovoltaic power generation device according to claim 2, characterized in that: The bidirectional DC-AC conversion module is a bidirectional DC-AC converter for bidirectional direct current to alternating current, and the third DC-DC conversion module is a bidirectional DC-DC converter for bidirectional direct current to direct current.

4. The photovoltaic power generation device according to claim 2, characterized in that: The first external interface and the second external interface are electrically connected to the bidirectional DC-AC conversion module respectively.

5. The photovoltaic power generation device according to claim 4, characterized in that: The first external interface is a grid access terminal, the second external interface is an AC output port, and the first external interface and the second external interface are waterproof interfaces.

6. The photovoltaic power generation device according to claim 5, characterized in that: The first DC-DC conversion module is a unidirectional DC-DC converter. The first DC-DC conversion module is provided with a third external interface. The third external interface is a photovoltaic input port. The third external interface is a waterproof interface.

7. The photovoltaic power generation device according to claim 6, characterized in that: The second DC-DC conversion module is a bidirectional DC-DC converter, so that the optical storage integrated machine has dual uses; the second DC-DC conversion module is provided with a fourth external interface, the fourth external interface is a DC input / output port, and the fourth external interface is a waterproof interface.

8. The photovoltaic power generation device according to claim 1, characterized in that: Also includes: A second battery pack, wherein the second battery pack is electrically connected to the first battery pack.

9. The photovoltaic power generation device according to claim 7, characterized in that: When the photovoltaic storage integrated machine is in on-grid or off-grid use, the first external interface is connected to the grid through the distribution box, the second external interface is connected to the load, and the third external interface and the fourth external interface are electrically connected to the photovoltaic components respectively.

10. The photovoltaic power generation device according to claim 7, characterized in that: When the photovoltaic energy storage device is in the mobile energy storage usage state, the first external interface is connected to the power grid through a power connector, the second external interface is connected to the terminal board for the AC external interface, the third external interface is connected to the DC external interface board, and the fourth external interface is electrically connected to the photovoltaic panel.

11. The photovoltaic power generation device according to claim 7, characterized in that: When the photovoltaic and storage integrated machine is in EPS usage state, the first external interface is connected to the power grid through the distribution box, the first battery pack is connected to the first external interface through the bidirectional PCS inverter, and the second external interface is connected to the load, so that the bidirectional PCS inverter continues to supply power to the load.

12. The photovoltaic power generation device according to claim 7, characterized in that: The second DC-DC conversion module includes: a power conversion circuit, which includes: a first power switch tube and a second power switch tube arranged in series at both ends of the first battery pack, one end of an inductor is arranged between the first power switch tube and the second power switch tube, and the other end of the inductor is arranged between a third power switch tube and a fourth power switch tube arranged in series, and both ends of the third power switch tube and the fourth power switch tube are respectively connected to a fourth external interface.

13. The photovoltaic power generation device according to claim 12, characterized in that: When the fourth external interface is connected to photovoltaic input, energy flows from the fourth external interface into the first battery pack. At this time, the power conversion circuit acts as an MPPT circuit to track the maximum photovoltaic power and samples the PACK+ voltage as an output control loop to control the maximum charging battery voltage.

14. The photovoltaic power generation device according to claim 12, characterized in that: When the fourth external interface is connected to an external power-consuming device, energy flows from the first battery pack into the fourth external interface. At this time, the power conversion circuit acts as a constant voltage power limiting circuit, samples the voltage of the fourth external interface as an output control loop, controls the constant voltage output of the fourth external interface, and obtains a preset voltage value.

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