Photovoltaic storage power generation system based on big data

Abstract

The present disclosure relates to the field of photovoltaic power generation technology, and in particular to a photovoltaic storage power generation system based on big data. The photovoltaic storage power generation system can be connected to a power grid, used to convert solar energy into current and transmit it to the power grid, and includes a photovoltaic device, an energy storage device, a photovoltaic storage integrated device and a monitoring device, wherein: the photovoltaic device is used to absorb light and generate current, the energy storage device has a charging mode and a discharging mode, and the photovoltaic storage integrated device is used to control the energy storage device to switch between the charging mode and the discharging mode; the monitoring device is connected to the photovoltaic storage integrated device, and is used to predict the change of the current generated by the photovoltaic device within a preset time according to meteorological data, and notify the photovoltaic storage integrated device to control the energy storage device to switch to the discharge mode or the charging mode according to the prediction result. The photovoltaic storage power generation system can predict the output of the photovoltaic device based on meteorological data, and control the energy storage device to discharge or charge in advance based on the prediction result, so that the volatility of the photovoltaic output is small.

Description

Technical Field

[0001] The present disclosure relates to the field of photovoltaic power generation technology, and in particular to a photovoltaic power generation system based on big data. Background Art

[0002] Photovoltaic power generation is recognized by the world for its advantages such as green, environmentally friendly, pollution-free and recyclable, and has become one of the most widely used types of new energy power generation. Photovoltaic power generation is directly affected by light. Because the light is unstable, the photovoltaic output fluctuates greatly. Photovoltaic power generation is a current source power supply. In the absence of external grid support (power outage or isolated grid mode), photovoltaic power generation cannot supply power at all.

[0003] Therefore, a technical solution that combines a photovoltaic system and an energy storage system is usually adopted. Specifically, the energy storage system compensates and adjusts the photovoltaic output to a certain extent according to the changes in the detected photovoltaic output, thereby reducing the volatility of the photovoltaic output.

[0004] At present, the energy storage system’s compensation and adjustment of photovoltaic output has a certain lag, resulting in large fluctuations in photovoltaic output.

[0005] The above information disclosed in the Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may include information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0006] The purpose of the present disclosure is to provide a photovoltaic storage power generation system based on big data, which can predict the output of the photovoltaic device based on meteorological data, and control the discharge or charging of the energy storage device in advance based on the prediction result, so as to reduce the volatility of the photovoltaic output.

[0007] In order to achieve the above-mentioned invention object, the present invention adopts the following technical solutions:

[0008] According to one aspect of the present disclosure, there is provided a photovoltaic storage power generation system based on big data, wherein the photovoltaic storage power generation system is connected to a power grid, and the photovoltaic storage power generation system comprises a photovoltaic device, an energy storage device, a photovoltaic storage integrated device, and a monitoring device;

[0009] The photovoltaic device is connected to the integrated light-storage device and is used to absorb light and generate current;

[0010] The energy storage device is connected to the photovoltaic integrated device and has a charging mode and a discharging mode; when the energy storage device is in the discharging mode, it can compensate for the current generated by the photovoltaic device; when the energy storage device is in the charging mode, it can obtain current from the photovoltaic device for storage;

[0011] The photovoltaic energy storage integrated device is connected to the power grid and is used to control the energy storage device to switch between a charging mode and a discharging mode;

[0012] The monitoring device is connected to the photovoltaic integrated device and is used to predict the change of the current generated by the photovoltaic device within a preset time according to meteorological data;

[0013] Among them, when the predicted result is that the current generated by the photovoltaic device within the preset time becomes smaller, the monitoring device notifies the integrated photovoltaic and storage device to control the energy storage device to switch to the discharge mode; when the predicted result is that the current generated by the photovoltaic device within the preset time becomes larger, the monitoring device notifies the integrated photovoltaic and storage device to control the energy storage device to switch to the charging mode.

[0014] In an exemplary embodiment of the present disclosure, the monitoring device comprises:

[0015] A meteorological instrument, used for collecting the meteorological data in real time;

[0016] A monitor, connected to the meteorological instrument, for receiving the meteorological data and predicting changes in the current generated by the photovoltaic device within the preset time according to the meteorological data;

[0017] Among them, when the predicted result is that the current generated by the photovoltaic device within the preset time becomes smaller, the monitor generates a first notification signal, the integrated photovoltaic and energy storage device receives the first notification signal, and controls the energy storage device to switch to the discharge mode according to the first notification signal; when the predicted result is that the current generated by the photovoltaic device within the preset time becomes larger, the monitor generates a second notification signal, the integrated photovoltaic and energy storage device receives the second notification signal, and controls the energy storage device to switch to the charging mode according to the second notification signal.

[0018] In an exemplary embodiment of the present disclosure, the integrated photovoltaic and storage device comprises:

[0019] DC bus;

[0020] A DC / DC boost converter having a first input terminal, a first output terminal and a first control terminal, wherein the first input terminal is connected to the photovoltaic device, and the first output terminal is connected to the DC bus;

[0021] A DC / DC bidirectional converter, comprising a second input terminal, a second output terminal and a second control terminal, wherein the second input terminal is connected to the energy storage device, and the second output terminal is connected to the DC bus;

[0022] A DC / AC bidirectional converter having a third input terminal, a third output terminal and a third control terminal, wherein the third input terminal is connected to the DC bus, and the third output terminal is connected to the power grid;

[0023] A controller having a fourth input terminal and a fourth output terminal, wherein the fourth input terminal is connected to the monitor, and the fourth output terminal has a first fork, a second fork, and a third fork;

[0024] Wherein, the first fork is connected to the first control end, and the controller can control the DC / DC boost converter to perform boost conversion on the current generated by the photovoltaic device;

[0025] The second fork is connected to the second control end, and the controller can receive the first notification signal, and control the DC / DC bidirectional converter to charge the energy storage device according to the first notification signal, so that the energy storage device switches to the charging mode; the controller can receive the second notification signal, and control the DC / DC bidirectional converter to discharge the DC bus according to the second notification signal, so that the energy storage device switches to the discharging mode;

[0026] The third branching port is connected to the third control terminal, and the controller can control the DC / AC bidirectional converter to invert the current on the DC bus or rectify the current from the power grid.

[0027] In an exemplary embodiment of the present disclosure, the monitor comprises:

[0028] A receiving unit, connected to the meteorological instrument, for receiving the meteorological data;

[0029] A prediction unit, connected to the receiving unit, for predicting changes in the current generated by the photovoltaic device within the preset time according to the meteorological data;

[0030] The notification signal generating unit is connected to the prediction unit and is used to generate the first notification signal or the second notification signal according to the change of the current generated by the photovoltaic device within the preset time.

[0031] In an exemplary embodiment of the present disclosure, the energy storage device comprises:

[0032] Energy storage batteries;

[0033] A battery management unit, wherein the input end of the battery management unit is connected to the output end of the energy storage battery, and the output end of the battery management unit is connected to the second input end, and is used to collect battery parameters of the energy storage battery and evaluate the state of the energy storage battery based on the battery parameters.

[0034] In an exemplary embodiment of the present disclosure, the energy storage battery is a lithium iron phosphate battery.

[0035] In an exemplary embodiment of the present disclosure, the photovoltaic device comprises:

[0036] Photovoltaic panels, which absorb sunlight and generate electricity;

[0037] A combiner box, wherein the input end of the combiner box is connected to the plurality of photovoltaic panels, the output end of the combiner box is connected to the first input end, and the combiner box can combine the current generated by the photovoltaic panels.

[0038] In an exemplary embodiment of the present disclosure, the monitor further includes:

[0039] A recording unit, connected to the combiner box, capable of recording the current parameters of the combiner box in real time;

[0040] The recording unit is also connected to the battery management unit and can record the battery parameters in real time.

[0041] In an exemplary embodiment of the present disclosure, there are multiple photovoltaic panels, and the multiple photovoltaic panels are distributed in an array.

[0042] In an exemplary embodiment of the present disclosure, the preset time ranges from 4 minutes to 6 minutes.

[0043] In the photovoltaic power generation system based on big data of the disclosed embodiment, the photovoltaic device can absorb light and generate current, and the photovoltaic device is connected to the photovoltaic integrated device; the energy storage device is also connected to the photovoltaic integrated device, and the energy storage device has a charging mode and a discharging mode; the photovoltaic integrated device is connected to the power grid, and is used to control the energy storage device to switch between the charging mode and the discharging mode; the monitoring device is connected to the photovoltaic integrated device, and is used to predict the change of the current generated by the photovoltaic device within a preset time according to meteorological data.

[0044] Therefore, when the prediction result is that the current generated by the photovoltaic device within the preset time becomes smaller, the monitoring device notifies the integrated photovoltaic and storage device to control the energy storage device to switch to the discharge mode. At this time, the energy storage device discharges to compensate for the smaller current generated by the photovoltaic device, so that the photovoltaic output (current) will not be too small; when the prediction result is that the current generated by the photovoltaic device within the preset time becomes larger, the monitoring device notifies the integrated photovoltaic and storage device to control the energy storage device to switch to the charging mode. At this time, the energy storage device can obtain part of the current from the photovoltaic device for storage (that is, the energy storage device is charged), so that the photovoltaic output (current) will not be too large.

[0045] In summary, the photovoltaic storage power generation system can predict the output of the photovoltaic device based on meteorological data, and control the discharge or charging of the energy storage device in advance based on the prediction results, thereby reducing the volatility of the photovoltaic output. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0047] Figure 1 It is a structural schematic diagram of a photovoltaic storage and power generation system based on big data according to an embodiment of the present disclosure.

[0048] Figure 2 Schematic diagram of the structure of the monitor according to the embodiment of the present disclosure.

[0049] Figure 3 It is a signal flow diagram of the photovoltaic storage power generation system based on big data in the embodiment of the present disclosure.

[0050] In the figure: 100, AC bus; 1, photovoltaic device; 11, photovoltaic panel; 12, junction box; 2, energy storage device; 21, energy storage battery; 22, battery management unit; 3, photovoltaic storage integrated device; 31, DC bus; 32, DC / DC boost converter; 33, DC / DC bidirectional converter; 34, DC / AC bidirectional converter; 35, controller; 4, monitoring device; 41, meteorological instrument; 42, monitor; 421, receiving unit; 422, prediction unit; 423, notification signal generating unit; 424, recording unit. DETAILED DESCRIPTION

[0051] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and the concepts of the example embodiments are fully conveyed to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure.

[0052] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the main technical ideas of the present disclosure.

[0053] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". Other relative terms such as "high", "lower", "top", "bottom", "left", "right", etc. are also used to have similar meanings.

[0054] When a structure is “on” another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is “directly” disposed on the other structure, or that the structure is “indirectly” disposed on the other structure via another structure.

[0055] The terms "a", "an", "the" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to indicate an open-ended inclusive meaning and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. The terms "first" and "second" etc. are used only as labels and are not intended to limit the quantity of their objects.

[0056] In an embodiment of the present disclosure, a photovoltaic power generation system based on big data is provided, which can be connected to a power grid to convert solar energy into electrical energy and transmit current to the power grid.

[0057] Specifically, the photovoltaic power generation system can be connected to the AC bus 100 in the power grid. Therefore, the transmission current generated by the photovoltaic power generation system is AC power, which will not be described in detail here.

[0058] like Figure 1 As shown, the photovoltaic power generation system may include a photovoltaic device 1, an energy storage device 2, a photovoltaic integrated device 3 and a monitoring device 4, wherein:

[0059] The photovoltaic device 1 can be connected to the integrated photovoltaic and storage device 3, and is used to absorb light and generate current; the energy storage device 2 can also be connected to the integrated photovoltaic and storage device 3, and has a charging mode and a discharging mode; the integrated photovoltaic and storage device 3 can be connected to the AC bus 100, and is used to control the energy storage device 2 to switch between the charging mode and the discharging mode; the monitoring device 4 can be connected to the integrated photovoltaic and storage device 3, and is used to predict the change of the current generated by the photovoltaic device 1 within a preset time according to meteorological data.

[0060] Therefore, when the prediction result is that the current generated by the photovoltaic device 1 within the preset time becomes smaller, the monitoring device 4 notifies the integrated photovoltaic and storage device 3 to control the energy storage device 2 to switch to the discharge mode. At this time, the energy storage device 2 discharges to compensate for the smaller current generated by the photovoltaic device 1, so that the photovoltaic output (current) will not be too small; when the prediction result is that the current generated by the photovoltaic device 1 within the preset time becomes larger, the monitoring device 4 notifies the integrated photovoltaic and storage device 3 to control the energy storage device 2 to switch to the charging mode. At this time, the energy storage device 2 can obtain part of the current from the photovoltaic device 1 for storage (that is, the energy storage device 2 is charged), so that the photovoltaic output (current) will not be too large.

[0061] In summary, the photovoltaic power generation system can predict the output of the photovoltaic device based on meteorological data, and control the discharge or charging of the energy storage device 2 in advance based on the prediction result, thereby reducing the volatility of the photovoltaic output.

[0062] The following is a detailed description of the various parts of the photovoltaic storage power generation system based on big data provided by the embodiment of the present disclosure in conjunction with the accompanying drawings:

[0063] like Figure 1 As shown, the photovoltaic device 1 can absorb light and generate current, and the photovoltaic device 1 can be connected to the integrated photovoltaic and storage device 3, and the integrated photovoltaic and storage device 3 can be connected to the AC bus 100. Therefore, the current generated by the photovoltaic device 1 can be transmitted to the AC bus 100 via the integrated photovoltaic and storage device 3.

[0064] Specifically, the photovoltaic device 1 includes a photovoltaic panel 11 and a combiner box 12, wherein:

[0065] The photovoltaic panel 11 is used to absorb light and generate current. The number of photovoltaic panels 11 can be multiple, and the multiple photovoltaic panels 11 are distributed in an array to better absorb light; the input end of the junction box 12 can be connected to the multiple photovoltaic panels 11, and the output end of the junction box 12 can be connected to the integrated photovoltaic storage device 3, which is used to converge the current generated by the multiple photovoltaic panels 11, which will not be described in detail here.

[0066] Of course, the photovoltaic device 1 may also include conventional photovoltaic equipment such as brackets, which are not listed here one by one.

[0067] like Figure 1As shown, the energy storage device 2 can be connected to the integrated photovoltaic storage device 3, and the photovoltaic device 1 can be connected to the integrated photovoltaic storage device 3, thereby, the energy storage device 2 and the photovoltaic device 1 can be connected through the integrated photovoltaic storage device 3.

[0068] The energy storage device 2 has a charging mode and a discharging mode. Specifically, when the energy storage device 2 is in the discharging mode, it can compensate for the current generated by the photovoltaic device 1; when the energy storage device 2 is in the charging mode, it can obtain current from the photovoltaic device 1 for storage.

[0069] The energy storage device 2 may include an energy storage battery 21 and a battery management unit 22, wherein:

[0070] The energy storage battery 21 can be charged or discharged. For example, the energy storage battery 21 can be a lithium iron phosphate battery. Of course, it can also be other types of batteries, which are not particularly limited here.

[0071] The input end of the battery management unit 22 can be connected to the output end of the energy storage battery 21, and the output end of the battery management unit 22 can be connected to the photovoltaic storage integrated device 3, which is used to collect battery parameters of the energy storage battery 21 and evaluate the state of the energy storage battery 21 based on the collected battery parameters to prevent the energy storage battery 21 from overcharging and over-discharging, thereby improving the utilization rate of the energy storage battery 21.

[0072] like Figure 1 As shown, the integrated photovoltaic and energy storage device 3 can be connected to the AC bus 100 to realize the conversion of DC and AC in the photovoltaic and energy storage power generation system, and can control the energy storage device 2 to switch between charging mode and discharging mode, so that the current output to the AC bus 100 has less fluctuation.

[0073] Specifically, the photovoltaic storage integrated device 3 may include a DC bus 31, a DC / DC boost converter 32, a DC / DC bidirectional converter 33, a DC / AC bidirectional converter 34 and a controller 35, wherein:

[0074] The DC / DC boost converter 32 has a first input terminal, a first output terminal and a first control terminal, the first input terminal can be connected to the photovoltaic device 1, specifically, the first input terminal can be connected to the junction box 12 in the photovoltaic device 1, and the first output terminal can be connected to the DC bus 31; the DC / DC bidirectional converter 33 has a second input terminal, a second output terminal and a second control terminal, the second input terminal can be connected to the energy storage device 2, specifically, the second input terminal can be connected to the energy storage battery 21 in the energy storage device 2, and the second output terminal can be connected to the DC bus 31; the DC / AC bidirectional converter 34 has a third input terminal, a third output terminal and a third control terminal, the third input terminal can be connected to the DC bus 31, and the third output terminal can be connected to the AC bus 100.

[0075] The controller 35 has a fourth input terminal and a fourth output terminal, the fourth input terminal can be connected to the monitoring device 4, and the fourth output terminal has a first fork, a second fork and a third fork, wherein:

[0076] The first branch can be connected to the first control end of the DC / DC boost converter 32, thereby realizing the connection between the controller 35 and the DC / DC boost converter 32, and the controller 35 can control the DC / DC boost converter 32 to boost the DC power generated by the photovoltaic device 1, that is, the DC / DC boost converter 32 can boost the smaller DC power directly generated by the photovoltaic device 1.

[0077] The second fork is connected to the second control terminal of the DC / DC bidirectional converter 33, thereby realizing the connection between the controller 35 and the DC / DC bidirectional converter 33. Figure 3 As shown, the controller 35 is capable of receiving a first notification signal sent by the monitoring device 4, and controlling the DC / DC bidirectional converter 33 to charge the energy storage device 2 according to the first notification signal, that is, the current on the DC bus 31 flows into the energy storage battery 21 through the DC / DC bidirectional converter 33.

[0078] In addition, the controller 35 can also receive a second notification signal issued by the monitoring device 4, and control the DC / DC bidirectional converter 33 to discharge the DC bus 31 according to the second notification signal, that is, the current in the energy storage battery 21 flows into the DC bus 31 through the DC / DC bidirectional converter 33.

[0079] In summary, the DC / DC bidirectional converter 33 can realize bidirectional current flow, so that the energy storage device 2 can switch between the charging mode and the discharging mode.

[0080] The third fork is connected to the third control end of the DC / AC bidirectional converter 34, thereby realizing the connection between the controller 35 and the DC / AC bidirectional converter 34, and the controller 35 can control the DC / AC bidirectional converter 34 to invert the current on the DC bus 31 or rectify the current from the AC bus 100.

[0081] That is to say, on the one hand, the DC / AC bidirectional converter 34 can convert the DC power on the DC bus 31 into AC power and transmit it to the AC bus 100, thereby supplying power to the outside; on the other hand, when the power of the energy storage battery 21 is insufficient, the DC / AC bidirectional converter 34 can also rectify the AC power on the AC bus 100 into DC power and charge the energy storage battery 21.

[0082] As mentioned above, the outputs of the photovoltaic device 1 and the energy storage device 2 of the photovoltaic power generation system in the present application are both direct current. Due to the existence of the DC bus 31, according to the voltage balance characteristics, the energy storage device 2 can automatically respond instantaneously and smooth out the second-level fluctuations of the photovoltaic device 1, thereby solving the transient fluctuation problem of the photovoltaic power generation system.

[0083] like Figure 1 As shown, the monitoring device 4 is used to predict the change of the current generated by the photovoltaic device 1 within a preset time according to meteorological data.

[0084] For example, the preset time value range can be 4 minutes to 6 minutes, that is, the monitoring device 4 can control the output of the integrated photovoltaic and energy storage device 3 with 4 minutes to 6 minutes as a node. In this way, it can not only ensure the interval time of the current change of the photovoltaic device 1, but also ensure that the installed capacity of the energy storage device 2 is not too large, thereby ensuring the economy and rationality of the entire photovoltaic and energy storage power generation system.

[0085] Of course, the preset time may also be less than 4 minutes or greater than 6 minutes, and there is no special limitation here.

[0086] Specifically, the monitoring device 4 may include a meteorological instrument 41 and a monitor 42, wherein:

[0087] like Figure 3 As shown, the meteorological instrument 41 is used to collect the external meteorological data such as temperature, humidity, wind speed, irradiation, etc. in real time, which are not listed here one by one; the monitor 42 is connected to the meteorological instrument 41 and the photovoltaic storage integrated device 3, and is used to receive the meteorological data and predict the change of the current generated by the photovoltaic device 1 within a preset time according to the meteorological data. The detailed analysis is as follows:

[0088] When the prediction result is that the current generated by the photovoltaic device 1 becomes smaller within the preset time, the monitor 42 generates a first notification signal, and the controller 35 in the photovoltaic storage integrated device 3 receives the first notification signal and controls the energy storage device 2 to switch to the discharge mode according to the first notification signal;

[0089] When the prediction result is that the current generated by the photovoltaic device 1 within the preset time increases, the monitor 42 generates a second notification signal, the controller 35 in the photovoltaic energy storage integrated device 3 receives the second notification signal, and controls the energy storage device 2 to switch to the charging mode according to the second notification signal.

[0090] In addition, if Figure 2 and Figure 3 As shown, the monitor 42 may include a receiving unit 421, a pre-judgment unit 422, a notification signal generating unit 423 and a recording unit 424, wherein:

[0091] The receiving unit 421 can be connected to the meteorological instrument 41 to receive meteorological data; the prediction unit 422 can be connected to the receiving unit 421 to predict the change of the current generated by the photovoltaic device 1 within a preset time according to the meteorological data; the notification signal generating unit 423 can be connected to the prediction unit 422 to generate a first notification signal or a second notification signal according to the change of the current generated by the photovoltaic device 1 within a preset time; the recording unit 424 can be connected to the junction box 12 to record the current parameters of the junction box 12 in real time. Of course, the recording unit 424 can also be connected to the battery management unit 22 to record the battery parameters of the energy storage battery 21 in real time.

[0092] Therefore, the monitor 42 can be connected to the photovoltaic device 1, the energy storage device 2 and the integrated photovoltaic and storage device 3, and collect real-time parameters of the photovoltaic device 1, the energy storage device 2 and the integrated photovoltaic and storage device 3, and then monitor the operating status of the entire photovoltaic and storage power generation system in real time.

[0093] It should be understood that the present disclosure does not limit its application to the detailed structure and arrangement of the components proposed in this specification. The present disclosure can have other embodiments and can be implemented and executed in a variety of ways. The aforementioned variations and modifications fall within the scope of the present disclosure. It should be understood that the present disclosure disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or evident in the text and / or the drawings. All these different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best mode known for implementing the present disclosure and will enable those skilled in the art to utilize the present disclosure.

Claims

1. A photovoltaic power generation system based on big data, which can be connected to a power grid and used to convert solar energy into electrical energy and transmit current to the power grid, characterized in that: The photovoltaic power generation system includes a photovoltaic device, an energy storage device, a photovoltaic integrated device and a monitoring device; The photovoltaic device is connected to the integrated light-storage device and is used to absorb light and generate current; The energy storage device is connected to the photovoltaic integrated device and has a charging mode and a discharging mode; when the energy storage device is in the discharging mode, it can compensate for the current generated by the photovoltaic device; when the energy storage device is in the charging mode, it can obtain current from the photovoltaic device for storage; The photovoltaic energy storage integrated device is connected to the AC bus in the power grid, and is used to control the energy storage device to switch between a charging mode and a discharging mode; The monitoring device is connected to the photovoltaic integrated device and is used to predict the change of the current generated by the photovoltaic device within a preset time according to meteorological data; The monitoring device comprises: A meteorological instrument, used for collecting the meteorological data in real time; A monitor, connected to the meteorological instrument, for receiving the meteorological data and predicting changes in the current generated by the photovoltaic device within the preset time according to the meteorological data; Wherein, when the prediction result is that the current generated by the photovoltaic device within the preset time becomes smaller, the monitor generates a first notification signal, the photovoltaic integrated device receives the first notification signal, and controls the energy storage device to switch to the discharge mode according to the first notification signal; when the prediction result is that the current generated by the photovoltaic device within the preset time becomes larger, the monitor generates a second notification signal, the photovoltaic integrated device receives the second notification signal, and controls the energy storage device to switch to the charging mode according to the second notification signal; The energy storage device comprises: Energy storage batteries; A battery management unit, wherein the input end of the battery management unit is connected to the output end of the energy storage battery, and the output end of the battery management unit is connected to the photovoltaic storage integrated device, and is used to collect battery parameters of the energy storage battery and evaluate the state of the energy storage battery based on the battery parameters.

2. The photovoltaic power generation system according to claim 1, characterized in that: The integrated light-storage device comprises: DC bus; A DC / DC boost converter having a first input terminal, a first output terminal and a first control terminal, wherein the first input terminal is connected to the photovoltaic device, and the first output terminal is connected to the DC bus; A DC / DC bidirectional converter, comprising a second input terminal, a second output terminal and a second control terminal, wherein the second input terminal is connected to the energy storage device, and the second output terminal is connected to the DC bus; A DC / AC bidirectional converter having a third input terminal, a third output terminal and a third control terminal, wherein the third input terminal is connected to the DC bus, and the third output terminal is connected to the power grid; A controller having a fourth input terminal and a fourth output terminal, wherein the fourth input terminal is connected to the monitor, and the fourth output terminal has a first fork, a second fork, and a third fork; Wherein, the first fork is connected to the first control end, and the controller can control the DC / DC boost converter to perform boost conversion on the current generated by the photovoltaic device; The second fork is connected to the second control end, and the controller can receive the first notification signal, and control the DC / DC bidirectional converter to charge the energy storage device according to the first notification signal, so that the energy storage device switches to the charging mode; the controller can receive the second notification signal, and control the DC / DC bidirectional converter to discharge the DC bus according to the second notification signal, so that the energy storage device switches to the discharging mode; The third branching port is connected to the third control terminal, and the controller can control the DC / AC bidirectional converter to invert the current on the DC bus or rectify the current from the power grid.

3. The photovoltaic power generation system according to claim 1, characterized in that: The energy storage battery is a lithium iron phosphate battery.

4. The photovoltaic power generation system according to claim 2, characterized in that: The photovoltaic device comprises: Photovoltaic panels, which absorb sunlight and generate electricity; A combiner box, wherein the input end of the combiner box is connected to the plurality of photovoltaic panels, the output end of the combiner box is connected to the first input end, and the combiner box can combine the current generated by the photovoltaic panels.

5. The photovoltaic power generation system according to claim 4, characterized in that: The monitor also includes: A recording unit, connected to the combiner box, capable of recording the current parameters of the combiner box in real time; The recording unit is also connected to the battery management unit and can record the battery parameters in real time.

6. The photovoltaic power generation system according to claim 4, characterized in that: There are multiple photovoltaic panels, and the multiple photovoltaic panels are distributed in an array.

7. The photovoltaic power generation system according to claim 1, characterized in that: The preset time ranges from 4 minutes to 6 minutes.

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