Power output method for photovoltaic direct-current energy storage coupling device

Abstract

The present application provides a photovoltaic direct-current energy storage coupling device, a power output method for the photovoltaic direct-current energy storage coupling device, an electronic device, and a non-transitory computer-readable storage medium. The photovoltaic direct-current energy storage coupling device is applied to a photovoltaic power generation system, and the photovoltaic power generation system comprises a photovoltaic power generation panel. The photovoltaic direct-current energy storage coupling device comprises: an MPPT module, configured to monitor the maximum power point of the photovoltaic power generation panel; a battery pack energy storage module, configured to output power; and a main control module, configured to control the photovoltaic power generation panel to perform power output on the basis of the maximum power point, and adjust the power output of the battery pack energy storage module on the basis of the power output of the photovoltaic power generation panel. The embodiments of the present application solve the problem that existing photovoltaic power generation systems each composed of a photovoltaic power generation panel and a photovoltaic grid-connected inverter cannot supply power at night.

Description

Power output method of photovoltaic DC energy storage coupling device Technical Field

[0001] The present application relates to the field of photovoltaic power generation technology, and more specifically, to a photovoltaic DC energy storage coupling device, a power output method for a photovoltaic DC energy storage coupling device, an electronic device, and a non-transient computer-readable storage medium. Background Art

[0002] There are three main types of photovoltaic power generation applications: Scenario 1: PV panels + grid-connected PV inverter; Scenario 2: PV panels + energy storage battery + off-grid PV inverter; and Scenario 3: PV panels + energy storage battery + hybrid inverter. Scenario 1 only operates under bright daylight conditions and cannot provide power at night. Scenario 2: The energy provided by PV cannot be fed back into the grid. Scenario 3: This is primarily for new applications. Retrofitting and upgrading Scenario 1 requires reinstalling everything except the PV panels, resulting in high costs.

[0003] Summary of the Invention

[0004] The present application aims to propose a photovoltaic DC energy storage coupling device, a power output method for a photovoltaic DC energy storage coupling device, an electronic device, and a non-transient computer-readable storage medium to solve the problem that the existing photovoltaic power generation system consisting of photovoltaic panels and photovoltaic grid-connected inverters cannot provide power at night.

[0005] According to one aspect of the present application, a photovoltaic DC energy storage coupling device is proposed, which is used in a photovoltaic power generation system, wherein the photovoltaic power generation system includes a photovoltaic power generation panel, and the photovoltaic DC energy storage coupling device includes: an MPPT module configured to monitor the maximum power point of the photovoltaic power generation panel; a battery pack energy storage module configured to output power; and a main control module configured to control the photovoltaic power generation panel to output power according to the maximum power point, and adjust the power output of the battery pack energy storage module according to the power output of the photovoltaic power generation panel.

[0006] According to some embodiments, the battery pack energy storage module is further configured to be charged using the photovoltaic panel.

[0007] According to one aspect of the present application, a power output method for a photovoltaic DC energy storage coupling device as described above is proposed, comprising: obtaining the historical output power of the photovoltaic power generation system; obtaining the real-time power of the photovoltaic power generation panel; and determining the output power of the battery pack energy storage module based on the historical output power data and the real-time power of the photovoltaic power generation panel.

[0008] According to some embodiments, before obtaining the real-time power of the photovoltaic panel, the power output method further includes: using the MPPT module to monitor the maximum power value of the photovoltaic panel, so that the photovoltaic panel outputs power according to the maximum power value.

[0009] According to some embodiments, before determining the output power of the battery pack energy storage module based on the historical output power data and the real-time power of the photovoltaic panel, the power output method further includes: determining whether the energy storage of the battery pack energy storage module reaches a preset threshold.

[0010] According to some embodiments, the power output method further includes: comparing the determined output power of the battery pack energy storage module with the discharge capacity range of the battery pack energy storage module; and outputting the output power of the battery pack energy storage module based on the comparison result.

[0011] According to some embodiments, the power output method further includes: using the photovoltaic power generation panel to charge the battery pack energy storage module.

[0012] According to some embodiments, the power output method further includes: determining whether the operating mode of the battery pack energy storage module is charging or discharging based on weather information.

[0013] According to one aspect of the present application, an electronic device is provided, comprising: a processor; and a memory storing a computer program, wherein when the computer program is executed by the processor, the processor executes any of the power output methods described above.

[0014] According to one aspect of the present application, a non-transitory computer-readable storage medium is provided, on which computer-readable instructions are stored. When the instructions are executed by a processor, the processor executes the power output method as described in any of the previous embodiments.

[0015] According to the embodiments of the present application, when upgrading and renovating an existing photovoltaic power generation system composed of photovoltaic panels and photovoltaic grid-connected inverters, there is no need to dismantle the photovoltaic grid-connected inverters in the photovoltaic power generation system. It is only necessary to install the photovoltaic DC energy storage coupling device proposed in the present application to solve the problem that the existing photovoltaic power generation system composed of photovoltaic panels and photovoltaic grid-connected inverters cannot provide power at night.

[0016] It should be understood that the above general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. By describing the exemplary embodiments in detail with reference to the accompanying drawings, the above and other objects, features and advantages of the present application will become more apparent.

[0018] FIG1 shows a block diagram of a photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application.

[0019] FIG2 shows a schematic structural diagram of a photovoltaic power generation system according to this example embodiment.

[0020] FIG3 shows a specific circuit diagram of a photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application.

[0021] FIG4 shows a flow chart of a power output method of a photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application.

[0022] FIG5 shows a flow chart of a power output method of another photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application.

[0023] FIG6 shows a flow chart of a power output method of another photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application.

[0024] FIG7 shows a flow chart of a method for monitoring the maximum power point of a photovoltaic panel according to an exemplary embodiment of the present application.

[0025] FIG8 a shows a flow chart of a power output method of another photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application.

[0026] FIG8 b shows a flow chart of a power output method of another photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application.

[0027] FIG9 a shows a schematic diagram of a historical output power curve according to an exemplary embodiment of the present application.

[0028] FIG9 b shows a schematic diagram of a real-time power curve of a photovoltaic power generation panel according to an exemplary embodiment of the present application.

[0029] FIG9 c shows a schematic diagram of an output power curve of a battery pack energy storage module according to an exemplary embodiment of the present application.

[0030] FIG. 10 shows an electronic device according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Identical figures in the drawings represent identical or similar parts, and thus repeated description thereof will be omitted.

[0032] 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. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these specific details, or other modes, components, materials, devices or operations may be employed. In these cases, well-known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0033] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0034] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0035] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0036] Figure 1 shows a block diagram of a photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application. According to an embodiment of the present application, the photovoltaic DC energy storage coupling device is used in a photovoltaic power generation system, and the photovoltaic power generation system includes a photovoltaic power generation panel.

[0037] As shown in Figure 1, the photovoltaic DC energy storage coupling device includes an MPPT module 101, a battery pack energy storage module 103, and a main control module 105. The MPPT module 101 is configured to monitor the maximum power point of the photovoltaic panel; the battery pack energy storage module 103 is configured to output power; and the main control module 105 is configured to control the photovoltaic panel to output power according to the maximum power point and adjust the power output of the battery pack energy storage module based on the power output of the photovoltaic panel.

[0038] According to an embodiment of the present application, the MPPT module 101 uses the perturbation observation method to monitor the maximum power point of the photovoltaic panel, thereby enabling the photovoltaic panel to operate at maximum power conditions to improve photovoltaic power generation efficiency. In a specific embodiment, the MPPT module 101 collects the voltage and current values ​​of the photovoltaic panel and controls the duty cycle of the photovoltaic panel's light-emitting diodes through the main control module 105 to control the output power of the photovoltaic panel. In some embodiments, the battery pack energy storage module is also configured to use the photovoltaic panel for charging.

[0039] In some embodiments, the battery pack energy storage module 103 includes a low-voltage battery pack with a rated output less than 60V and / or a high-voltage battery pack with a rated output greater than 200V. Furthermore, the battery pack energy storage module 103 can also be stacked with 5kW / h battery packs or 10kW / h battery packs. In specific embodiments, the battery pack energy storage module 103 includes a BMS board and communicates with the main control module 105 for data exchange and logic control via RS485 or CAN communication protocols.

[0040] According to the embodiment shown in Figure 1, when upgrading and renovating an existing photovoltaic power generation system consisting of photovoltaic panels and photovoltaic grid-connected inverters, there is no need to dismantle the photovoltaic grid-connected inverters in the photovoltaic power generation system. It is only necessary to install the photovoltaic DC energy storage coupling device proposed in this application to solve the problem that the existing photovoltaic power generation system consisting of photovoltaic panels and photovoltaic grid-connected inverters cannot provide power at night.

[0041] Figure 2 shows a structural schematic diagram of a photovoltaic power generation system according to this example embodiment. The photovoltaic power generation system shown in Figure 2 includes photovoltaic panels, smart meters, cloud platforms & mobile phone APPs, photovoltaic grid-connected inverters, loads, power grids and photovoltaic DC energy storage coupling devices.

[0042] As shown in Figure 2, the photovoltaic DC energy storage coupling device includes a DC arc detection module, an insulation impedance detection module, an MPPT module, a buck output module, a DC / DC module, a stackable battery pack energy storage unit, a main control module, an RS485 smart meter communication module / CT module, a WIFI / 4G communication module, and an RS485 / CAN battery pack communication module.

[0043] The DC arc detection module detects the DC current measurement signal of the photovoltaic panel in real time and compares it with the samples that have completed neural network training. It can detect DC series arcs, parallel arcs and ground arcs on the photovoltaic panel side. After identification, it reports to the main control module, shutting down the photovoltaic DC energy storage coupling device and uploading the data to the cloud platform and mobile app to display the fault.

[0044] The insulation detection module can identify the impedance of the positive and negative poles of the photovoltaic power generation panel to the ground by detecting the positive and negative impedance voltage division on the input side when the photovoltaic power generation panel is powered on, thereby preventing safety accidents caused by excessive leakage current when the impedance is low, and reporting it to the main control module to make the photovoltaic DC energy storage coupling device alarm, and upload data to the cloud platform & mobile phone APP (103) to display the fault.

[0045] The MPPT (Maximum Power Point Tracking) module monitors the maximum power point of photovoltaic panels, ensuring they operate at maximum power and improving power generation efficiency. In a specific embodiment, the MPPT module collects the voltage and current of the panels, and the main control module controls the duty cycle of the panels' switches.

[0046] The BUCK output module collects the voltage and current output from the busbar to the photovoltaic grid-connected inverter through the main control module, and controls the total output power of the photovoltaic DC energy storage coupling device to the photovoltaic grid-connected inverter.

[0047] The DC / DC module is a circuit topology module that connects stackable battery pack energy storage units to the bus. It can be a resonant converter topology or a buck-boost topology, etc. It includes all bidirectional power electronic conversion topologies and can be used to charge batteries or discharge batteries to the bus.

[0048] The battery pack energy storage module can be a low-voltage battery pack with a rated output less than 60V or a high-voltage battery pack with a rated output greater than 200V. Both 5kW / h and 10kW / h battery packs can be stacked. The battery pack type or output voltage level of the battery pack energy storage module determines the DC / DC module circuit topology, which includes bidirectional isolated or non-isolated DC / DC conversion topologies. The battery pack includes a BMS board. The battery pack energy storage module and the main control module exchange data and perform logic control via RS485 or CAN communication.

[0049] The main control module, consisting of an MCU and DSP, is responsible for collecting voltage and current data from various circuit topologies, controlling the circuit topology, communicating with external devices, and performing data processing and exchange. The MCU and DSP can simultaneously determine if data is correct or incorrect, ensuring functional safety.

[0050] The RS485 smart meter communication module or CT module is connected to the smart meter or CT module via a network cable or wirelessly. One end of the RS485 smart meter communication module or CT module monitors the power consumption on the output side of the photovoltaic inverter, and the other end monitors the power consumption on the grid and load side. It is used to extract data such as peak power consumption time, photovoltaic power generation grid-connected power, and power consumption time distribution curve.

[0051] The Wi-Fi / 4G communication module is used to exchange data with the cloud platform and mobile app, managing and controlling the BMS board in the battery pack energy storage module of the photovoltaic DC energy storage coupling device. For example, it can upload user data, display fault information, and issue user control commands.

[0052] The RS485 / CAN battery pack communication module is used for internal communication, providing a path for data exchange between the main control module and the BMS board in the battery pack energy storage module.

[0053] FIG3 shows a specific circuit diagram of a photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application. The photovoltaic DC energy storage coupling device shown in FIG3 includes a low-voltage battery pack-side full-bridge LLC circuit and a buck-boost circuit; the photovoltaic-side boost circuit corresponds to the MPPT module of FIG2 and the bus output-side buck circuit corresponds to the buck output module of FIG2. Specifically, the low-voltage battery pack-side full-bridge LLC circuit and buck-boost circuit correspond to the DC / DC module of FIG2, the photovoltaic-side boost circuit corresponds to the MPPT module of FIG2, and the bus output-side buck circuit corresponds to the buck output module of FIG2.

[0054] It should be noted that the schematic diagram shown in FIG3 does not show the circuit structures of the control unit and the lightning protection and discharge unit. However, this should not be considered as the absence of these structures. Those skilled in the art can reasonably arrange these structures based on the actual situation of the equipment, and no specific limitations are given here.

[0055] FIG4 shows a flow chart of a power output method of a photovoltaic DC energy storage coupling device according to an exemplary embodiment of the present application. The power output method shown in FIG4 includes steps S401 , S403 and S405 .

[0056] As shown in FIG4 , in step S401 , the historical output power of the photovoltaic power generation system is obtained, as shown in FIG9 a .

[0057] In step S403, the real-time power of the photovoltaic panel is obtained, as shown in FIG9b.

[0058] In some embodiments, before step S403 , the MPPT module shown in FIG4 is used to monitor the maximum power value of the photovoltaic panel, so that the photovoltaic panel outputs power according to the maximum power value.

[0059] In step S405, the output power of the battery pack energy storage module is determined according to the historical output power data and the real-time power of the photovoltaic panel, as shown in FIG9c.

[0060] In some embodiments, the output power of the battery pack energy storage module is the historical output power of the photovoltaic power generation system minus the real-time power of the photovoltaic power generation panel.

[0061] According to an embodiment of the present application, before step S405, it is necessary to determine whether the energy storage of the battery pack energy storage module has reached a preset threshold, for example, 100%. Step S405 is performed only after the preset threshold is reached.

[0062] According to other embodiments, after step S405, the determined output power of the battery pack energy storage module is compared with the discharge capacity range of the battery pack energy storage module; and based on the comparison result, that is, when the determined output power of the battery pack energy storage module is within the discharge capacity range of the battery pack energy storage module, the output power of the battery pack energy storage module is output.

[0063] In other embodiments, when the remaining power of the battery pack energy storage module is less than the output power of the battery pack energy storage module, after step S405, the method shown in Figure 4 also includes using the photovoltaic power generation panel to charge the battery pack energy storage module.

[0064] According to some embodiments of the present application, the method shown in FIG4 further includes determining whether the operating mode of the battery pack energy storage module is charging or discharging based on weather information.

[0065] According to the embodiment shown in FIG4 , the output power of the battery pack energy storage module is automatically adjusted according to the real-time power of the photovoltaic panels, thereby meeting the daytime and nighttime power supply requirements of the photovoltaic power generation system.

[0066] Figure 5 shows a flow chart of a power output method of another photovoltaic DC energy storage coupling device according to an example embodiment of the present application. As shown in Figure 5, in step S501, it is determined whether there is power output from the photovoltaic power generation panel. If there is power output, step S503 is executed; otherwise, step S505 is executed.

[0067] In step S503, it is determined whether the remaining power of the battery pack energy storage module is less than 30%. If the remaining power of the battery pack energy storage module is less than 30%, step S507 is executed to forcibly charge the battery pack energy storage module and execute the method shown in Figure 6; otherwise, step S509 is executed.

[0068] In step S509 , it is determined whether extreme weather exists. If so, step S507 is executed to forcibly charge the battery pack energy storage module. Otherwise, the method shown in FIG6 is executed.

[0069] In step S505, if the photovoltaic panel does not output power, power is output according to the discharge characteristic curve of the battery pack energy storage module, and step S511 is executed.

[0070] In step S511, it is determined whether the depth of discharge of the battery pack energy storage module is less than 20%. If the depth of discharge of the battery pack energy storage module is not less than 20%, step S505 is executed; otherwise, step S507 is executed.

[0071] According to the embodiment shown in FIG5 , the working mode of the battery pack energy storage module can be adaptively adjusted to select charging or discharging according to the power output status of the photovoltaic panel and the weather conditions.

[0072] Figure 6 shows a flow chart of a power output method for another photovoltaic DC energy storage coupling device according to an example embodiment of the present application. As shown in Figure 6, in step S601, it is determined whether the discharge depth of the battery pack energy storage module is 100%. If not, step S603 is executed to charge the battery pack energy storage module. Otherwise, step S605 is executed.

[0073] In step S605 , the historical output power of the photovoltaic power generation system is obtained through a smart meter or a CT module.

[0074] In step S607, the MPPT module is used to monitor the maximum power point of the photovoltaic power generation panel, so that the photovoltaic power generation panel outputs power according to the maximum power point.

[0075] In step S609, the real-time output power of the photovoltaic panel is obtained.

[0076] In step S611, the real-time output power of the battery pack energy storage module is determined using the historical output power and the real-time output power of the photovoltaic panel.

[0077] In step S613, it is determined whether the real-time output power of the battery pack energy storage module is within the charge and discharge capacity range of the battery pack energy storage module. If so, step S615 is executed; otherwise, step S617 is executed.

[0078] In step S615 , the battery pack energy storage module outputs power according to the determined real-time output power.

[0079] In step S617, power is output according to the charge and discharge capabilities of the battery pack energy storage module.

[0080] In step S619, it is determined whether the remaining power of the battery pack energy storage module is greater than the real-time output power of the battery pack energy storage module. If so, step S613 is executed; if not, step S621 is executed.

[0081] In step S621, the power required to fully charge the battery pack energy storage module is obtained.

[0082] In step S623, the remaining power of the photovoltaic panel when it is being charged and discharged is obtained according to the historical power curve of the photovoltaic panel.

[0083] In step S625 , the surplus power of the photovoltaic panel is used to charge the battery pack energy storage module.

[0084] In step S627, it is determined whether the battery pack energy storage module is fully charged. If so, step S607 is executed; otherwise, step S625 is executed.

[0085] According to the embodiment shown in FIG6 , the output power of the battery pack energy storage module is automatically adjusted according to the real-time power of the photovoltaic power generation panel, thereby meeting the daytime and nighttime power supply requirements of the photovoltaic power generation system.

[0086] The output power of a photovoltaic power generation system is equal to the sum of the photovoltaic power and the battery power, and is a curve that represents a dynamic transformation process. According to the power output method shown in Figures 5 and 6, the output power consists of six stages. In the first stage, the photovoltaic panel charges the battery pack energy storage module to determine whether additional power is needed. In the second stage, as the light intensity increases, the photovoltaic panel power increases, and the battery pack energy storage module discharge power decreases. During the morning rush hour, the battery's participation in discharge power increases. In the third stage, the photovoltaic panel power meets the output power requirement and charges the battery pack energy storage module. In the fourth stage, the photovoltaic panel power decreases, and the battery discharges to supplement the output power. In the fifth stage, the photovoltaic panel output power continues to decrease, reducing the photovoltaic panel output power until the battery is fully charged when the photovoltaic power drops to zero. In the sixth stage, the output power is provided by the battery, and the cycle returns to the first stage.

[0087] According to an embodiment of the present application, in step S607 shown in Figure 6, the maximum power point of the photovoltaic panel is monitored using the perturbation and observation method. Figure 7 shows a flow chart of a method for monitoring the maximum power point of a photovoltaic panel according to an exemplary embodiment of the present application.

[0088] As shown in FIG7 , in step S701 , the output power curve of the photovoltaic power generation system is obtained by utilizing the MPPT power curve of the photovoltaic power generation panel and the charge and discharge characteristics of the battery pack energy storage module.

[0089] In step S703, an adaptive variable step size perturbation observation method is used to speed up the search for the maximum power point and reduce the perturbation oscillation frequency around the maximum power point.

[0090] In a specific embodiment, the maximum power point search range of the photovoltaic panel is controlled to be 0.8Voc (80% of the photovoltaic panel operating voltage) to Vmpp (maximum power point operating voltage). The step size adjuster adjusts K = (Vmpp - 0.8Voc) / 2 based on the difference between the historical Vmpp average and 0.8Voc, with a minimum perturbation step size of 0.5V.

[0091] In step S705, it is determined whether the photovoltaic panel has reached its peak power. If so, step S707 is executed; if not, step S703 is executed.

[0092] In step S707, fixed-step scanning is used to perform power tracking through a fuzzy control method to determine the maximum power point of the photovoltaic panel.

[0093] In a specific embodiment, the disturbance step size is controlled by real-time output power. The actual input at time n corresponds to the specific power change of the photovoltaic at time n and the step size at time n-1. The output parameter at time n corresponds to the corresponding step size number, thereby reducing the maximum power tracking problem caused by the multi-peak effect. For example, the scanning step size is set to ΔU, the direction of voltage reduction is the scanning direction, and the current value In and voltage value Un at the scanning point are recorded and the instantaneous power Pn is calculated. After the calculation is completed, it is compared with the previous value, and the highest data group is recorded as Ptemp, Utemp, and Item, and the other data is discarded. The scanning process stops when the photovoltaic short-circuit current Isc is encountered. The maximum power point is obtained when the difference between Utemp and Ptemp is equal to zero, which is Ptemp.

[0094] In step S709, the photovoltaic panel outputs power according to the maximum power point, and then continues to execute step S7001.

[0095] According to the embodiment shown in FIG7 , the actual maximum power point of the photovoltaic panel can be obtained in a short time through the adaptive variable step size perturbation observation method, thereby enabling real-time adjustment of the output power of the battery pack energy storage module.

[0096] Figure 8a shows a flow chart of a power output method for another photovoltaic DC energy storage coupling device according to an example embodiment of the present application. As shown in Figure 8a, it is first determined whether the current photovoltaic power generation panel has power output at the maximum power point. If not, it is output according to the battery pack discharge characteristic curve by default, for example, at a discharge rate of 0.5C. When the SOC capacity (SOC capacity, also known as battery depth) output by the battery pack reaches 20%, the output stops and the battery pack is forced to charge. If there is power output at the maximum power point of the current photovoltaic panel, it is also necessary to determine whether the current battery pack energy storage module SOC capacity is less than 30% and whether it is extreme weather. If it is less than 30% or in extreme weather, it enters the forced battery pack charging mode. If it is greater than 30% and it is not extreme weather, it can enter the manual mobile phone APP setting mode and execute the method shown in Figure 8b. In the forced charging mode, the photovoltaic power generation panel gives priority to fully charging the battery pack energy storage module before outputting, and the battery pack energy storage module does not participate in the discharge. After the SOC value of the battery pack energy storage module reaches 100%, the step "output power equals photovoltaic MPPT power" in Figure 8b is executed, that is, the photovoltaic panel outputs power according to the maximum power point, and the photovoltaic power generation system only uses the output power of the photovoltaic panel.

[0097] Figure 8b shows a flow chart of a power output method of another photovoltaic DC energy storage coupling device according to an example embodiment of the present application. As shown in Figure 8b, the modes set by the mobile phone APP include battery priority mode, power supply priority mode and charging and discharging mode.

[0098] In battery priority mode, photovoltaics give priority to charging the battery. After the battery is fully charged, it outputs power to the photovoltaic grid-connected inverter. When the photovoltaic power is greater than the rated output power of the photovoltaic power generation system, it can only output power at 1.1 times the rated output of the total power of the photovoltaic DC energy storage coupling device to the photovoltaic grid-connected inverter.

[0099] In power-priority mode, you need to set the start and end times for the battery pack energy storage module to discharge during morning and evening peak hours, or other peak electricity consumption times. During these times, the output power is equal to the sum of the output power of the photovoltaic panels and the output power of the battery pack energy storage module. At other times, only the photovoltaic panels participate in power output, that is, only the photovoltaic panels output power at the maximum power point. When the battery state-of-charge (SOC) capacity is less than 20%, the battery does not participate in power output during peak electricity consumption. During non-peak electricity consumption, the PV power is detected to see if it exceeds the set threshold. If it is, the excess power is used to charge the battery until it is fully charged. If it is less than the threshold, the output power is reduced to charge the battery until it is fully charged.

[0100] In the charging-discharging mode, similar to the power supply priority mode, the photovoltaic power that exceeds the set threshold is used to charge the battery until the battery is fully charged; if the threshold is not met, the output power is reduced to charge the battery until the battery is fully charged.

[0101] FIG10 shows an electronic device according to an exemplary embodiment of the present application. The electronic device 200 according to this embodiment of the present application is described below with reference to FIG10. The electronic device 200 shown in FIG10 is merely an example and should not limit the functionality and scope of use of the embodiments of the present application.

[0102] As shown in FIG10 , electronic device 200 is implemented as a general-purpose computing device. Components of electronic device 200 may include, but are not limited to, at least one processing unit 210, at least one storage unit 220, a bus 230 connecting various system components (including storage unit 220 and processing unit 210), a display unit 240, and the like.

[0103] The storage unit stores program codes that can be executed by the processing unit 210, so that the processing unit 210 performs the methods described in this specification according to various exemplary embodiments of the present application. For example, the processing unit 210 can perform the method shown in FIG4 .

[0104] The storage unit 220 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 2201 and / or a cache memory unit 2202 , and may further include a read-only memory unit (ROM) 2203 .

[0105] The storage unit 220 may also include a program / utility 2204 having a set (at least one) of program modules 2205, such program modules 2205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0106] Bus 230 may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0107] The electronic device 200 can also communicate with one or more external devices 300 (e.g., a keyboard, a pointing device, a Bluetooth device, etc.), one or more devices that enable a user to interact with the electronic device 200, and / or any device that enables the electronic device 200 to communicate with one or more other computing devices (e.g., a router, a modem, etc.). Such communication can occur via an input / output (I / O) interface 250. Furthermore, the electronic device 200 can communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network such as the Internet) via a network adapter 260. The network adapter 260 can communicate with other modules of the electronic device 200 via the bus 230. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with the electronic device 200, including but not limited to microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0108] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described here can be implemented by software or by combining software with necessary hardware. The technical solution according to the embodiment of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, or a network device, etc.) to execute the above method according to the embodiment of the present application.

[0109] The software product can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, a system, device or component of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0110] Computer-readable storage media may include a data signal propagated in baseband or as part of a carrier wave, which carries readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The readable storage medium may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination thereof.

[0111] The program code for performing the operations of the present application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, and the like, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, as a stand-alone software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving a remote computing device, the remote computing device can be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0112] The computer-readable medium carries one or more programs. When the one or more programs are executed by the device, the computer-readable medium implements the aforementioned functions.

[0113] Those skilled in the art will appreciate that the modules described above can be distributed in the device according to the description of the embodiment, or can be modified accordingly to be used in one or more devices that are different from the embodiment. The modules of the above embodiment can be combined into one module or further divided into multiple submodules.

[0114] According to an embodiment of the present application, a computer program is provided, including a computer program or instructions. When the computer program or instructions are executed by a processor, the method described above can be executed.

[0115] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the method and core ideas of the present application. At the same time, changes or modifications made by those skilled in the art based on the ideas of the present application, the specific implementation methods, and the scope of application of the present application, all fall within the scope of protection of the present application. In summary, the contents of this specification should not be construed as limiting the present application.

Claims

1. A photovoltaic DC energy storage coupling device, characterized in that, The photovoltaic DC energy storage coupling device is used in a photovoltaic power generation system, and the photovoltaic power generation system includes a photovoltaic power generation panel. The photovoltaic DC energy storage coupling device includes: An MPPT module configured to monitor the maximum power point of the photovoltaic power generation panel; A battery pack energy storage module configured to output power; and A main control module configured to control the photovoltaic power generation panel to output power according to the maximum power point and adjust the power output of the battery pack energy storage module according to the power output of the photovoltaic power generation panel; The main control module is further configured to determine the charge and discharge time of the battery pack energy storage module and / or the photovoltaic power generation panel according to an external working mode setting instruction; Wherein, the working mode setting instruction includes a battery priority mode, a power supply priority mode, and a charging and discharging simultaneously mode. In the battery priority mode, the main control module is further configured to control the photovoltaic power generation panel to charge the battery pack energy storage module until it is fully charged and then output power; In the power supply priority mode, the main control module is further configured to control the battery pack energy storage module to output power according to a preset time threshold and / or a power threshold; In the charging and discharging simultaneously mode, the main control module is further configured to charge the battery pack energy storage module by using the photovoltaic power generation panel according to a preset threshold.

2. The photovoltaic DC energy storage coupling device according to claim 1, wherein The battery pack energy storage module is also configured to be charged by using the photovoltaic power generation panel.

3. A power output method of a photovoltaic DC energy storage coupling device as described in any one of claims 1-2, characterized in that, It includes: Obtain the historical output power of the photovoltaic power generation system; Obtain the real-time power of the photovoltaic power generation panel; Determine the output power of the battery pack energy storage module according to the historical output power data and the real-time power of the photovoltaic power generation panel; The power output method further includes: Determine the charge and discharge time of the battery pack energy storage module and / or the photovoltaic power generation panel according to an external working mode setting instruction; Wherein, the working mode setting instruction includes a battery priority mode, a power supply priority mode, and a charging and discharging simultaneously mode. In the battery priority mode, use the main control module to charge the battery pack energy storage module through the photovoltaic power generation panel until it is fully charged and then output power; In the power supply priority mode, use the main control module to control the battery pack energy storage module to output power according to a preset time threshold and / or a power threshold; In the charging and discharging simultaneously mode, use the main control module to charge the battery pack energy storage module by using the photovoltaic power generation panel according to a preset threshold.

4. The power output method according to claim 3, wherein Before obtaining the real-time power of the photovoltaic power generation panel, the power output method further includes: Use the MPPT module to monitor the maximum power value of the photovoltaic power generation panel so that the photovoltaic power generation panel outputs power according to the maximum power value.

5. The power output method according to claim 4, wherein Before determining the output power of the battery pack energy storage module according to the historical output power data and the real-time power of the photovoltaic power generation panel, the power output method further includes: Judge whether the energy storage of the battery pack energy storage module reaches a preset threshold.

6. The power output method according to claim 3, wherein It further includes: Compare the determined output power of the battery pack energy storage module with the discharge capacity range of the battery pack energy storage module; Output the output power of the battery pack energy storage module according to the comparison result.

7. The power output method according to claim 3, wherein Further comprising: Using the photovoltaic power generation panel to charge the battery pack energy storage module.

8. The power output method according to claim 7, characterized in that Further comprising: Determining, according to weather information, that the working mode of the battery pack energy storage module is charging or discharging.

9. An electronic device, comprising: A processor; And A memory storing a computer program, which when executed by the processor causes the processor to execute the power output method according to any one of claims 3-8.

10. A non-transitory computer-readable storage medium having stored thereon computer-readable instructions which, when executed by a processor, cause the processor to execute the power output method according to any one of claims 3-8.

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