Control method, device and equipment of photovoltaic energy storage power supply device and medium

Abstract

The invention relates to the technical field of electric energy conversion, in particular to a control method and device of a photovoltaic energy storage power supply device, equipment and a medium. The method comprises the following steps: acquiring a first electric energy state between a photovoltaic power supply unit and a battery energy storage and power supply integrated unit, a second electric energy state between the photovoltaic power supply unit and a target load unit, and a third electric energy state between a battery management unit and the target load unit; determining a line connection mode of the series-parallel switching circuit according to the first electric energy state, the second electric energy state and the third electric energy state; and determining a target connection state between the battery packs according to the line connection mode, so as to adjust charging and discharging parameters of the battery energy storage and power supply integrated unit according to the target connection state. According to the invention, the series-parallel connection mode between the battery packs can be flexibly adjusted, so that the photovoltaic energy storage power supply device can efficiently utilize electric energy, and the requirements of efficient, stable and intelligent energy management are met.

Description

Technical Field

[0001] This application relates to the technical field of power conversion, and particularly to a control method, device, equipment and medium for a photovoltaic energy storage power supply device. Background Art

[0002] In a traditional photovoltaic energy storage power supply system, the power transmission mode is relatively fixed. It usually determines the power transmission mode according to the initial design and is difficult to adapt to different working conditions. For example, when the photovoltaic power generation is unstable due to fluctuations in light intensity, or when the energy storage device changes dynamically with the charge and discharge state, it is unable to adjust the power transmission mode well to efficiently utilize electric energy. Or in a high-light scene, when the photovoltaic power generation is sufficient, due to the fixed and single power transmission mode, the opportunity to efficiently store or output electric energy may be missed; in a low-light scene and when the energy storage device has a low battery level, it is difficult to adjust in time to intelligently switch different power transmission modes to extend the power supply duration. This lack of flexibility in the transmission mode easily causes problems such as energy waste, unstable power supply, and shortened lifespan of the energy storage device, and cannot meet the requirements of the photovoltaic energy storage power supply system for efficient, stable, and intelligent energy management. Summary of the Invention

[0003] Embodiments of this application provide a control method, device, equipment and medium for a photovoltaic energy storage power supply device, which can flexibly adjust the series-parallel connection mode between each battery pack, enabling the photovoltaic energy storage power supply device to efficiently utilize electric energy and meet the requirements of efficient, stable, and intelligent energy management.

[0004] In one aspect of the embodiments of this application, a control method for a photovoltaic energy storage power supply device is provided, which is applied to a photovoltaic energy storage power supply device. The photovoltaic energy storage power supply device includes a battery management unit, a photovoltaic power supply unit, a battery energy storage power supply integrated unit composed of multiple battery packs, and a series-parallel switching circuit for each of the battery packs. The battery management unit is connected to the photovoltaic power supply unit, the series-parallel switching circuit, and the battery energy storage power supply integrated unit. The method is executed by the battery management unit, and the method includes: Obtain a first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, a second power state between the photovoltaic power supply unit and a target load unit, and a third power state between the battery management unit and the target load unit; Determine the line connection mode of the series-parallel switching circuit according to the first power state, the second power state, and the third power state; Determine the target connection state between each of the battery packs according to the line connection mode, so as to adjust the charge and discharge parameters of the battery energy storage power supply integrated unit according to the target connection state.

[0005] Optionally, obtaining the first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit includes: If the photovoltaic power supply unit discharges to the battery energy storage power supply integrated unit, obtain the first discharge parameter between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, and determine the first power state based on the first discharge parameter; If the photovoltaic power supply unit does not discharge to the battery energy storage power supply integrated unit, determine that the first power state is a state of no photovoltaic power input.

[0006] Optionally, the second power state is determined through the following steps: If the photovoltaic power supply unit discharges to the target load unit, obtain the second discharge parameter between the photovoltaic power supply unit and the target load unit, and determine the second power state based on the second discharge parameter; If the photovoltaic power supply unit does not discharge to the target load unit, determine that the second power state is a state of no photovoltaic power input.

[0007] Optionally, the third power state is determined through the following steps: If the battery energy storage power supply integrated unit discharges to the target load unit, obtain the third discharge parameter between the battery energy storage power supply integrated unit and the target load unit, and determine the third power state based on the third discharge parameter; If the target load unit discharges to the battery energy storage power supply integrated unit, obtain the fourth discharge parameter between the battery energy storage power supply integrated unit and the target load unit, and determine the third power state based on the fourth discharge parameter.

[0008] Optionally, determining the line connection mode of the series-parallel switching circuit according to the first power state, the second power state, and the third power state includes: If the first discharge parameter is determined according to the first power state, the second discharge parameter is determined according to the second power state, and the third discharge parameter is obtained according to the third power state, determine that the line connection mode is the first connection mode; If the first discharge parameter is determined according to the first power state, the second discharge parameter is determined according to the second power state, and the fourth discharge parameter is obtained according to the third power state, determine that the line connection mode is the second connection mode; If the first power state is a state without photovoltaic power input, and the second discharge parameter is determined according to the second power state, and the third discharge parameter is obtained according to the third power state, determine that the line connection mode is the third connection mode; If both the first power state and the second power state are states without photovoltaic power input, and the third discharge parameter is obtained according to the third power state, determine that the line mode is the fourth connection mode; If both the first power state and the second power state are states without photovoltaic power input, and the fourth discharge parameter is obtained according to the third power state, determine that the line mode is the fifth connection mode.

[0009] Optionally, determining the target connection state between each of the battery packs according to the line connection mode includes: If the line connection mode is the first connection mode or the second connection mode, determine that the target connection state is a series-parallel combination state, and the series-parallel combination state is used to represent that some battery packs are connected in series with each other and some battery packs are connected in parallel with each other; If the line connection mode is the third connection mode or the fourth connection mode, determine that the target connection state is a series state, and the series state is used to represent that all battery packs are connected in series with each other or some battery packs are connected in series with each other; If the line connection mode is the fifth connection mode, determine that the target connection state is a parallel state, and the parallel state is used to represent that all battery packs are connected in parallel with each other.

[0010] Optionally, the target load unit includes a power grid system and an electrical energy load, the photovoltaic energy storage power supply device further includes a power grid monitoring circuit for the power grid system and a load monitoring circuit for the electrical energy load, and the method further includes: Determine a first power supply parameter for the power grid system and a second power supply parameter for the electrical energy load according to the second power state and the third power state; Determine the open / close state of the power grid monitoring circuit and / or the load detection circuit according to the first power supply parameter and the second power supply parameter.

[0011] According to one aspect of the embodiments of the present application, there is provided a control of a photovoltaic energy storage power supply device, which is applied to a photovoltaic energy storage power supply device. The photovoltaic energy storage power supply device includes a battery management unit, a photovoltaic power supply unit, a battery energy storage power supply integrated unit composed of a plurality of battery packs, and a series-parallel switching circuit for each of the battery packs. The battery management unit is connected to the photovoltaic power supply unit, the series-parallel switching circuit, and the battery energy storage power supply integrated unit. The method is executed by the battery management unit, and the device includes: An acquisition unit, configured to acquire a first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, a second power state between the photovoltaic power supply unit and the target load unit, and a third power state between the battery management unit and the target load unit; A first determination unit, configured to determine a line connection mode of the series-parallel switching circuit according to the first power state, the second power state, and the third power state; A second determination unit, configured to determine a target connection state between each battery pack according to the line connection mode, so as to adjust charge and discharge parameters of the battery energy storage power supply integrated unit according to the target connection state.

[0012] On the other hand, an embodiment of the present application provides an electronic device, including a processor and a memory; The memory is used to store a computer program; The processor executes the computer program to implement the foregoing method.

[0013] On the other hand, an embodiment of the present application provides a computer-readable storage medium, where the storage medium stores a computer program, and the computer program is executed by a processor to implement the foregoing method.

[0014] The embodiments of the present application at least include the following beneficial effects: According to a control method, device, equipment, and medium for a photovoltaic energy storage power supply device provided by the present application, different from the existing photovoltaic energy storage power supply device, the present application provides a new structure of a photovoltaic energy storage power supply device. Through a battery energy storage power supply integrated unit composed of multiple battery packs and a series-parallel switching circuit for each battery pack, the series-parallel connection mode between each battery pack can be flexibly adjusted, so that the photovoltaic energy storage power supply device can efficiently utilize electric energy.

[0015] Furthermore, through the first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, the second power state between the photovoltaic power supply unit and the target load unit, and the third power state between the battery management unit and the target load unit, that is, by adjusting the connection relationship of each battery pack according to the power transmission state between different modules, the connection relationship of each battery pack can be dynamically adjusted following different power transmission states, that is, adjusting the charge and discharge parameters of the battery energy storage power supply integrated unit, so that the power utilization rate of the entire photovoltaic energy storage power supply device always remains at an efficient level, thereby meeting the requirements of the photovoltaic energy storage power supply device for efficient, stable, and intelligent energy management. Description of the Drawings

[0016] The accompanying drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation to the technical solution of the present application.

[0017] Figure 1 It is an overall schematic diagram of the photovoltaic energy storage power supply device provided by the embodiment of the present application; Figure 2 It is an overall structural diagram of an exemplary photovoltaic energy storage power supply device provided by the embodiment of the present application; Figure 3 It is a schematic flowchart of the control method of the photovoltaic energy storage power supply device provided by the embodiment of the present application; Figure 4 It is a block diagram of the control device of the photovoltaic energy storage power supply device provided by the embodiment of the present application; Figure 5 It is a schematic structural diagram of an electronic device provided by the embodiment of the present application. Detailed implementation manners

[0018] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. When the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application detailed in the appended claims.

[0019] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information can also be called the second information, and similarly, the second information can also be called the first information. Depending on the context, the words "if", "when" as used herein can be interpreted as "when...", "when...", or "in response to a determination".

[0020] The terms "at least one", "a plurality", "each", "any one", etc. used in the present application, at least one includes one, two or more, a plurality includes two or more, each refers to each of the corresponding plurality, and any one refers to any one of the plurality.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein are for the purpose of describing embodiments of this application only and are not intended to limit this application.

[0022] The method provided by the embodiments of this application can be applied to a terminal, can also be applied to a server, or can also be software running on a terminal or a server. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, a smart speaker, a smart watch, a vehicle-mounted terminal, etc., but is not limited thereto; the server side can be configured as an independent physical server, can also be configured as a server cluster or a distributed system composed of multiple physical servers, and can also be configured as a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The server can also be a node server in a blockchain network; the software can be an application implementing the above method, etc., but is not limited to the above forms.

[0023] This application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multi-processor systems, microprocessor-based systems, set-top boxes, programmable consumer electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, and so on. This application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. This application can also be practiced in a distributed computing environment, where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

[0024] The following provides a detailed introduction to the background technology of this application: In traditional photovoltaic energy storage power supply systems, the connection modes of battery packs are mostly fixed and single, lacking flexibility. Usually, the series-parallel connection method is determined according to the initial design, making it difficult to adapt to different working conditions. For example, only the load power demand is considered, without fully combining the PV power generation power and the change of battery pack power. When the PV power generation is unstable due to the fluctuation of light intensity, or the battery pack power changes with charging and discharging, the connection of the battery pack cannot be dynamically optimized. For example, when the light is strong and the battery pack is nearly fully charged, due to the fixed connection mode, the opportunity to efficiently store or output electrical energy may be missed; when the light is weak and the battery pack power is low, it is difficult to intelligently switch the connection to extend the power supply duration. This connection mode lacking flexibility is prone to problems such as energy waste, unstable power supply, and shortened battery life, and cannot meet the requirements of modern photovoltaic energy storage systems for efficient, stable, and intelligent energy management. Traditional photovoltaic energy storage systems often adopt relatively fixed battery pack connection modes and control strategies, making it difficult to respond effectively and timely to the fluctuation of light intensity and the change of battery pack power.

[0025] The following details the specific hardware environment of this application. The photovoltaic energy storage power supply device of this application includes a battery management unit, a photovoltaic power supply unit, a battery energy storage power supply integrated unit composed of multiple battery packs, and a series-parallel switching circuit for each of the battery packs. The battery management unit is connected to the photovoltaic power supply unit, the series-parallel switching circuit, and the battery energy storage power supply integrated unit. See specifically Figure 1 and Figure 2 shown. Figure 1 The situation of multiple battery packs is shown, for example, N + 2 battery packs, and the number of N can be set arbitrarily, which is any positive integer greater than 0. Figure 2 This is the specific structure diagram of the embodiment of this application. Figure 2 The number of battery packs in Figure 2 is 9. Of course, the number 9 is only an exemplary number, and the embodiment of this application is described based on Figure 1 and Figure 2PV1 - PVn shown in the figure also includes MPPT1 - MPPTn connected to each of PV1 - PVn one - to - one. MPPT is the maximum power point tracking of photovoltaic power generation. AC / DC is a transfer interface. K1 is the switch of the grid monitoring circuit, and K2 is the switch of the load monitoring circuit. The electric energy generated by the photovoltaic power supply unit can be transmitted to the grid or the load through AC / DC. At the same time, one or more battery packs of the battery energy storage power supply integrated unit can also send electric energy into AC / DC through DC / DC to transmit the electric energy to the grid or the load. Or the grid can transmit electric energy to the battery pack through AC / DC via DC / DC to charge the battery pack. The photovoltaic power supply unit can also transmit the generated electric energy to the battery pack to charge the battery pack. By dynamically adjusting the series - parallel relationship between each battery pack, the efficient utilization requirements of electric energy under different working conditions can be met.

[0026] As Figure 3 shown, in the embodiment of the present application, a control method for a photovoltaic energy storage power supply device is provided, which is applied to a photovoltaic energy storage power supply device. The photovoltaic energy storage power supply device includes a battery management unit, a photovoltaic power supply unit, a battery energy storage power supply integrated unit composed of multiple battery packs, and a series - parallel switching circuit for each of the battery packs. The battery management unit is connected to the photovoltaic power supply unit, the series - parallel switching circuit, and the battery energy storage power supply integrated unit. Referring to Figure 3 shown, the control method for the photovoltaic energy storage power supply device provided in the embodiment of the present application specifically includes, but is not limited to, steps S1 to S3: In step S1, obtain the first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, the second power state between the photovoltaic power supply unit and the target load unit, and the third power state between the battery management unit and the target load unit.

[0027] Specifically, the first power state can represent the power transmission situation between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, the second power state can represent the power transmission situation between the photovoltaic power supply unit and the target load unit, and the third power state can represent the power transmission situation between the battery management unit and the target load unit.

[0028] Through the above - mentioned first power state, second power state, and third power state, the power situation inside the entire photovoltaic energy storage power supply device can be seen. For example, whether the current photovoltaic power supply unit is discharging to the battery energy storage power supply integrated unit or the target load unit, and what its discharge parameters are; or whether the battery energy storage power supply integrated unit is charging / discharging, and what its charging parameters / discharge parameters are specifically.

[0029] In one embodiment of the present application, obtaining the first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit includes: If the photovoltaic power supply unit discharges to the battery energy storage power supply integrated unit, obtain the first discharge parameter between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, and determine the first power state based on the first discharge parameter; If the photovoltaic power supply unit does not discharge to the battery energy storage power supply integrated unit, determine that the first power state is a state without photovoltaic power input.

[0030] Specifically, if the photovoltaic power supply unit discharges to the battery energy storage power supply integrated unit, then obtain the first discharge parameter between the photovoltaic power supply unit and the battery energy storage power supply integrated unit. The first discharge parameter includes the charging power of the photovoltaic power supply unit to the battery energy storage power supply integrated unit, and use this to determine the first power state.

[0031] If the photovoltaic power supply unit does not discharge to the battery energy storage power supply integrated unit, for example, in the case of no light or weak light at night, the photovoltaic power supply unit does not generate electric energy. At this time, determine that the first power state is a state without photovoltaic power input.

[0032] In one embodiment of the present application, the second power state is determined through the following steps: If the photovoltaic power supply unit discharges to the target load unit, obtain the second discharge parameter between the photovoltaic power supply unit and the target load unit, and determine the second power state based on the second discharge parameter; If the photovoltaic power supply unit does not discharge to the target load unit, determine that the second power state is a state without photovoltaic power input.

[0033] Specifically, if the photovoltaic power supply unit discharges to the target load unit, then obtain the second discharge parameter between the photovoltaic power supply unit and the target load unit. The first discharge parameter includes the charging power of the photovoltaic power supply unit to the target load unit, and use this to determine the first power state. The target load unit includes, for example Figure 1 or the power grid (power grid system) and load shown in the figure.

[0034] If the photovoltaic power supply unit does not discharge to the target load unit, for example, in the case of no light or weak light at night, the photovoltaic power supply unit does not generate electric energy. At this time, determine that the second power state is a state without photovoltaic power input.

[0035] In one embodiment of the present application, the third power state is determined through the following steps: If the battery energy storage and power supply integrated unit discharges to the target load unit, obtain the third discharge parameter between the battery energy storage and power supply integrated unit and the target load unit, and determine the third power state based on the third discharge parameter. If the target load unit discharges to the battery energy storage and power supply integrated unit, obtain the fourth discharge parameter between the battery energy storage and power supply integrated unit and the target load unit, and determine the third power state based on the fourth discharge parameter.

[0036] Specifically, if the battery energy storage and power supply integrated unit discharges to the target load unit, it indicates that the battery pack in the current battery energy storage and power supply integrated unit has sufficient power. The third discharge parameter between the battery energy storage and power supply integrated unit and the target load unit can be obtained, and the third power state can be determined based on this.

[0037] If the target load unit discharges to the battery energy storage and power supply integrated unit, obtain the fourth discharge parameter between the battery energy storage and power supply integrated unit and the target load unit, which indicates that the battery pack needs to be charged through the power grid system at this time. For example, in the scenario where the photovoltaic power supply unit has insufficient power supply, the third power state can be determined based on this.

[0038] In one embodiment, there is also a situation where there is no power transmission between the battery energy storage and power supply integrated unit and the target load unit. For example, when the photovoltaic power supply unit can output sufficient power to the battery energy storage and power supply integrated unit and the target load unit, there is no need for additional power transmission at this time.

[0039] It should be noted that when the battery energy storage and power supply integrated unit is powered by both the photovoltaic power supply unit and the target load simultaneously, it preferentially receives power from the photovoltaic power supply unit. When the output parameter of the photovoltaic power supply unit is greater than the preset threshold, that is, when the photovoltaic power supply unit can provide a large amount of power, the power supply from the target load unit is no longer received at this time.

[0040] In step S2, determine the line connection mode of the series-parallel switching circuit according to the first power state, the second power state, and the third power state.

[0041] Optionally, the determining the line connection mode of the series-parallel switching circuit according to the first power state, the second power state, and the third power state includes: If the first discharge parameter is determined according to the first power state, the second discharge parameter is determined according to the second power state, and the third discharge parameter is obtained according to the third power state, determine that the line connection mode is the first connection mode; If the first discharge parameter is determined according to the first power state, the second discharge parameter is determined according to the second power state, and the fourth discharge parameter is obtained according to the third power state, determine that the line connection mode is the second connection mode; If the first power state is a state without photovoltaic power input, the second discharge parameter is determined according to the second power state, and the third discharge parameter is obtained according to the third power state, determine that the line connection mode is the third connection mode; If both the first power state and the second power state are states without photovoltaic power input, and the third discharge parameter is obtained according to the third power state, determine that the line mode is the fourth connection mode; If both the first power state and the second power state are states without photovoltaic power input, and the fourth discharge parameter is obtained according to the third power state, determine that the line mode is the fifth connection mode.

[0042] Specifically, under different working conditions, for example, when the power output of the current photovoltaic power supply unit is insufficient and the load needs to be powered by the battery pack at this time, the battery packs can be connected in series, so that the current becomes larger and the power output becomes larger, so as to meet the power supply requirements in the current working condition or scenario as much as possible.

[0043] In step S3, determine the target connection state between the battery packs according to the line connection mode.

[0044] Optionally, the determining the target connection state between the battery packs according to the line connection mode includes: If the line connection mode is the first connection mode or the second connection mode, determine that the target connection state is a series-parallel combination state, and the series-parallel combination state is used to represent that some battery packs are connected in series with each other and some battery packs are connected in parallel with each other; If the line connection mode is the third connection mode or the fourth connection mode, determine that the target connection state is a series state, and the series state is used to represent that all battery packs are connected in series with each other or some battery packs are connected in series with each other; If the line connection mode is the fifth connection mode, determine that the target connection state is a parallel state, and the parallel state is used to represent that all battery packs are connected in parallel with each other.

[0045] Specifically, the series-parallel combination state can represent that a certain part of the battery packs are connected in series with each other and a certain part of the battery packs are connected in parallel with each other. For example Figure 2The battery packs A - I shown can be connected in series by closing S1, S2, S11, and S22, so that battery packs A, B, and C are in series. For the other battery packs D - I, all switches except S3 - S6 among S14 - S28 can be closed, so that battery packs D - I are in parallel with each other and also in parallel with the series circuit of battery packs A, B, and C.

[0046] The following are the adjusted connection methods between each battery pack in different scenarios: First, take the series - parallel connection of 9 battery packs as an example for illustration. Refer to Figure 2 , (other embodiments can be multiple combinations, such as 6, 12, 15, etc., with every 3 battery packs forming a series group). The initial connection state of each battery pack is that S1 - S6 are closed to make ABC in series, DEF in series, and GHI in series, and S11, S14, S17, S22, S25, S28 are closed, so that ABC forms a series circuit, DEF forms a transmission circuit, and GHI forms a series circuit. Among them, the series circuits of ABC, DEF, and GHI are in parallel with each other. Based on this circuit structure, in different energy conversion strategies (in different scenarios), the BMS (Battery Management Unit) can automatically adjust the connection method of the battery packs according to the power generation power of the PV (Photovoltaic Power Supply Unit) and the power of the PACK (Battery Energy Storage and Power Supply Integrated Unit), so that the connection of each battery pack can adapt to the power transmission requirements in different scenarios. Specifically, it includes the following scenarios (strategies): Strategy 1 (corresponding to the second connection method): During the process of the PV charging the PACK and simultaneously supplying power to the load or the power grid through AC / DC (K1 or K2 can be controlled to conduct): When specific light and power conditions are met (that is, the electrical energy output parameters of the photovoltaic power supply unit are greater than or equal to the preset electrical energy threshold) and the PACK power is moderate, the BMS changes the current distribution of the battery pack branch (the battery pack branch is any one of the three branches of ABC, EDF, and GHI), controls some series switches to disconnect to make the target battery pack form a series branch, a parallel branch, or a series - parallel state, and at the same time closes the corresponding parallel switches to parallelize these series branches, so as to disconnect the switches in at least one series group to make the battery pack alone as a series branch. The technical effect is that the voltage combination method of the battery pack becomes more diverse and flexible. When the PV output voltage has a small - amplitude fluctuation, it can better match the battery pack voltage with the PV output voltage, reduce the voltage difference, and thus improve the energy conversion efficiency.

[0047] For example, when the PV power generation is greater than 3 kW (light intensity reaches 800 - 1000 W / m²) and the PACK power is between 30% - 60%, the BMS adjusts the connection of the battery pack: closes S11, S20, S14, S23, S17, S5, S6, and S28, disconnects all other switches, and only the battery packs A and D remain as separate series branches. The third group (G, H, I) remains unchanged. At this time, the battery pack becomes three parallel series branches (the series group of A, D, and GHI).

[0048] Strategy 2 (corresponding to the first connection method): During the process of PV and PACK simultaneously supplying power to the grid through AC / DC (AC / DC controls K1 to conduct): Both the PV power generation and the PACK power meet the conditions (within the appropriate range): The BMS controls the battery pack to be in the initial connection state mentioned above. Technical effect: Provides the maximum discharge current. The grid may require a large amount of electrical energy for charging during peak electricity consumption. The fully parallel connection method allows the battery pack to output electrical energy with the maximum capacity to meet the high-power demand of the grid.

[0049] For example, when the PV power generation is between 2 - 3 kW (light intensity is 500 - 700 W / m²) and the PACK power is greater than 80%, the BMS adjusts the connection of the battery pack: The BMS controls S1 - S6 to close, making ABC in series, DEF in series, GHI in series, and closes S11, S14, S17, S22, S25, S28, making the series connections of ABC, DEF, and GHI in parallel with each other.

[0050] Strategy 3 (corresponding to the third connection method): During the process of only PV supplying power to the load (not involving PACK charging) (AC / DC controls K2 to conduct): The PV power generation is sufficient and the PACK power is full: The BMS maintains the control of the battery pack in the initial connection state. Technical effect: Reduces the switch actions and the complexity of system control, and improves the reliability and stability of the system.

[0051] For example, when the PV power generation reaches 4 kW or more (light intensity is greater than 900 W / m²) and the PACK power is fully charged (100%), the BMS adjusts the connection of the battery pack: Maintains the initial connection state of the battery pack. The BMS controls S1 - S6 to close, making ABC in series, DEF in series, GHI in series, and closes S11, S14, S17, S22, S25, S28, making the series connections of ABC, DEF, and GHI in parallel with each other.

[0052] Strategy 4 (corresponding to the fourth connection method): During the process of only the PACK supplying power to the load (when the AC / DC control K2 is turned on): When the PACK power is within the power supply range and there is no PV power generation (in the case of zero light intensity), the BMS connects all battery packs in parallel individually. Technical effect: By connecting all battery packs in parallel, a stable low-voltage and high-current output can be provided when only the PACK supplies power to the load, which is especially suitable for providing stable power supply to the load at night or in the absence of light. In addition, the parallel connection method allows the battery packs to achieve balanced discharge, and the BMS can more easily monitor the discharge status of each battery pack in this mode.

[0053] For example, when the power generation is 0 (at night or in extreme weather resulting in a light intensity of 0 W / m²) and the PACK power is between 50% - 70%, the BMS adjusts the connection of the battery packs: closes S11 - S28, and all other switches are open, ensuring that each battery pack is individually connected in parallel to the DC / DC.

[0054] Strategy 5 (corresponding to the first connection method): During the process of both PV and PACK supplying power to the local load and the grid (hybrid load power supply) (when the AC / DC controls K1 and K2 are turned on): When both the PV power generation and the PACK power are appropriate: The BMS keeps the battery packs in the initial connection state. Technical effect: Optimize energy distribution. In addition, this connection method also has a certain degree of flexibility in the case of insufficient PV power generation or insufficient PACK power.

[0055] For example, when the PV power generation is approximately 2.5 - 3.5 kW (light intensity is 600 - 800 W / m²) and the PACK power is 85% - 95%, the BMS adjusts the connection of the battery packs: keeps the initial connection state of the battery packs, and the BMS controls S1 - S6 to be closed so that ABC are in series, DEF are in series, GHI are in series, and S11, S14, S17, S22, S25, S28 are closed, so that the series-connected ABC, DEF, and GHI are connected in parallel with each other.

[0056] Strategy 6 (corresponding to the fifth connection method): During the process of the grid charging the PACK (when the AC / DC control K1 is turned on): When the grid is at a low valley and the PACK power is low: The BMS connects all battery packs in parallel individually. Technical effect: Connecting all battery packs in parallel for the grid to charge the PACK facilitates the grid to charge the battery packs with a larger current, improving the charging efficiency. In addition, in the case of insufficient grid power, this all-parallel connection method also facilitates the BMS to adjust the charging current according to the actual power that the grid can provide.

[0057] For example, when the power grid is in a low electricity consumption period and the battery pack power is lower than 30%, the BMS adjusts the connection of the battery pack: closes S11 - S28, and disconnects the rest of the switches, ensuring that each battery pack is separately connected in parallel to the DC / DC.

[0058] It should be noted that PV mentioned in the above strategies 1 - 6 is the photovoltaic power supply unit described in the embodiments of the present application, PACK is the integrated battery energy storage power supply unit described in the embodiments of the present application, BMS is the battery management unit described in the present application, and the power grid and the load together form the target load unit described in the present application.

[0059] Optionally, the target load unit includes a power grid system and an electrical energy load. The photovoltaic energy storage power supply device further includes a power grid monitoring circuit for the power grid system and a load monitoring circuit for the electrical energy load. The method further includes: Determining a first power supply parameter to the power grid system and a second power supply parameter to the electrical energy load according to the second power state and the third power state; Determining the on - off state of the power grid monitoring circuit and / or the load detection circuit according to the first power supply parameter and the second power supply parameter.

[0060] Specifically, through the power grid monitoring circuit corresponding to the power grid system ( Figure 1 or Figure 2 the power grid in), the power transmission state of the photovoltaic charging unit and / or the integrated battery energy storage power supply unit to the power grid and / or the load can be controlled. That is, in the case of excessive current, the switch K1 and / or the switch K2 are disconnected, so that the photovoltaic charging unit and / or the integrated battery energy storage power supply unit cannot perform power transmission to the power grid and / or the load.

[0061] The following are the processing steps for different monitoring scenarios: When the AC / DC determines that there is a fault in the power grid (such as short - circuit, over - voltage, etc.) or a fault in the load through the power grid monitoring circuit or the load monitoring circuit (which can be implemented by a voltage detection circuit and a current detection circuit), the AC / DC can quickly cut off the faulty connection through the switch K1 or K2 to avoid the spread of the fault affecting the entire photovoltaic energy storage power supply device. At the same time, when a fault occurs, the AC / DC sends a fault signal to the BMS, and the BMS records the relevant information of the power grid / load fault, such as the time of the fault occurrence, the type of the fault (short - circuit, open - circuit, over - voltage, over - current, etc.), the current and voltage data at the time of the fault, etc.

[0062] The first scenario is a grid fault. The grid path is disconnected, that is, switch K1 is opened. The grid monitoring circuit continuously monitors the voltage and current of the grid. When it detects that the grid voltage exceeds 250V (the overvoltage fault setting value), or the voltage drops to 0 (short - circuit fault), or the current exceeds 1.5 times the rated current (assuming the rated current is 10A, that is, exceeds 15A), the AC / DC converter disconnects K1. At the same time, the grid monitoring circuit sends a grid fault signal to the BMS. After receiving the grid fault signal, the BMS records the relevant information of the grid fault according to the grid fault signal. Meanwhile, the BMS controls the alarm device to respond based on the grid fault. The specific alarm device is not limited, it can be on - site voice broadcast or remotely send fault information to the mobile device of the staff such as a mobile phone.

[0063] The second scenario is a load fault. The load path is disconnected, that is, switch K2 is opened. The load monitoring circuit continuously monitors the voltage and current of the load. When it monitors that the current suddenly increases to more than 2 times the rated current (assuming the rated current is 2A, that is, exceeds 4A) and lasts for more than 1 second, or the load voltage exceeds the rated operating voltage (15V, 17V, and 48V), or the voltage drops to 0 (short - circuit fault), the AC / DC converter disconnects K2. At the same time, the load monitoring circuit sends a load fault signal to the BMS. After receiving the load fault signal, the BMS records the relevant information of the load fault according to the load fault signal. Meanwhile, the BMS controls the alarm device to respond based on the load fault. The specific alarm device is not limited, it can be on - site voice broadcast or remotely send fault information to the mobile device of the staff such as a mobile phone.

[0064] By dynamically adjusting the connection mode of the battery pack proposed above, compared with the prior art, in this application, the BMS adjusts the series - parallel state of the battery pack according to the PV power generation power (i.e., the first discharge parameter between the photovoltaic power supply unit and the battery energy storage power supply integrated unit and the second discharge parameter between the photovoltaic power supply unit and the target load unit) and the power of the battery pack (the first power state and / or the third power state). The benefits brought about are as follows: First, improve energy utilization efficiency. According to the PV power generation power and the power of the battery pack (the first power state and / or the third power state), flexibly switch the connection. For example, when the PV power generation is strong and the battery pack can be charged, it is optimized to a high - voltage series - branch combination (that is, three branches are connected in parallel, and three battery packs in each branch are connected in series) to improve the charging efficiency.

[0065] Second, enhance power supply stability. When the light or load changes suddenly, quickly adjust the connection of the battery pack to ensure stable current and voltage output. For example, switch to the parallel mode under low light to maintain power supply to the load.

[0066] Third, extend the battery life and avoid overcharging and over-discharging of the battery. For example, reduce the charging current or adjust the connection to lower the charging voltage when the battery is at high charge, and reasonably distribute the discharge current when the battery is at low charge to reduce damage to the battery and improve the overall reliability and economy of the system.

[0067] By dynamically characterizing the series-parallel connection modes of multiple battery packs and flexibly configuring the power transmission states of the battery packs, it can better match the output voltage of the photovoltaic power supply unit and the input voltage requirements of the load.

[0068] In different energy conversion strategies (such as the above Strategy 1 - Strategy 6), the BMS can automatically adjust the series-parallel states of the battery packs according to the PV power generation power and the PACK power, thereby adjusting the working states of the battery packs.

[0069] In summary, by reasonably adjusting the series-parallel connection modes of the battery packs, the energy conversion losses caused by voltage mismatch are reduced. Compared with the prior art, the energy conversion efficiency of the photovoltaic energy storage power supply device is improved.

[0070] The series-parallel switching circuit can cooperate with the BMS to quickly adjust the working mode of the battery pack in the case of drastic changes in light or sudden changes in the load, ensuring the stability of the output voltage and current.

[0071] The connection mode of the series-parallel switching circuit can flexibly select the number and connection mode of the battery packs according to the actual application scenario, avoiding cost waste caused by over-configuration. Compared with the traditional battery pack with a single specification and fixed connection, under the same energy storage and power supply requirements, the battery replacement frequency is reduced and the user's usage cost is lowered.

[0072] According to one aspect of the present application, a control device for a photovoltaic energy storage power supply device is also proposed, as Figure 4 shown, Figure 4 is a block diagram of the control device for the photovoltaic energy storage power supply device. The control device for the photovoltaic energy storage power supply device includes: an acquisition unit 301, a first determination unit 302, and a second determination unit 303.

[0073] The acquisition unit 301 is used to acquire the first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, the second power state between the photovoltaic power supply unit and the target load unit, and the third power state between the battery management unit and the target load unit; The first determination unit 302 is used to determine the line connection mode of the series-parallel switching circuit according to the first power state, the second power state, and the third power state; A second determination unit 303, configured to determine a target connection state between each of the battery packs according to the line connection mode, so as to adjust charge and discharge parameters of the battery energy storage and power supply integrated unit according to the target connection state.

[0074] An embodiment of the present application also discloses an electronic device, including: At least one processor; At least one memory, configured to store at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the method as described above.

[0075] It can be understood that the content in the specific embodiments of the above method is applicable to the embodiments of this electronic device. The functions specifically implemented by the embodiments of this electronic device are the same as those of the embodiments of the above method, and the beneficial effects achieved are also the same as those of the embodiments of the above method.

[0076] Exemplarily, referring to Figure 5 , Figure 5 is a schematic structural diagram of an electronic device provided in an embodiment of the present application. Taking the electronic device as a terminal device as an example, Figure 5 in, the terminal device 1200 may include an RF (Radio Frequency) circuit 1210, a memory 1220 including one or more computer-readable storage media, an input unit 1230, a display unit 1240, a sensor 1250, an audio circuit 1260, a short-range wireless transmission module 1270, a processor 1280 including one or more processing cores, and a power supply 1290 and other components. Those skilled in the art can understand that Figure 5 the device structure shown in does not constitute a limitation on the terminal device, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0077] The RF circuit 1210 can be used for receiving and transmitting information or signals during a call. Specifically, after receiving the downlink information from the base station, it is handed over to one or more processors 1180 for processing. Additionally, data related to the uplink is sent to the base station. Generally, the RF circuit 1210 includes, but is not limited to, antennas, at least one amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, etc. In addition, the RF circuit 1210 can also communicate with the network and other devices via wireless communication. The wireless communication can use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication), GPRS (General Packet Radio Service), CDMA (Code Division Multiple Access), WCDMA (Wideband Code Division Multiple Access), LTE (Long Term Evolution), email, SMS (Short Messaging Service), etc.

[0078] The memory 1220 can be used to store software programs and modules (or units). The processor 1280 executes various functional applications and data processing by running the software programs and modules (or units) stored in the memory 1220. The memory 1220 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function), etc.; the data storage area can store data created according to the use of the terminal device 1200 (such as audio data, a phone book), etc. In addition, the memory 1220 can include high-speed random access memory and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. Correspondingly, the memory 1220 can also include a memory controller to provide access to the memory 1220 by the processor 1280 and the input unit 1230. Although Figure 5 the RF circuit 1210 is shown, it can be understood that it does not necessarily constitute a part of the terminal device 1200 and can be omitted entirely within the scope of not changing the essence of the invention according to needs.

[0079] The input unit 1230 can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to object settings and function controls. Specifically, the input unit 1230 can include a touch-sensitive surface 1231 and other input devices 1232. The touch-sensitive surface 1231, also known as a touch display screen or a touchpad, can collect touch operations of an object on or near it (such as operations of the object using any suitable object or accessory such as a finger or a stylus on or near the touch-sensitive surface 1231), and drive corresponding connection devices according to a preset program. Optionally, the touch-sensitive surface 1231 can include two parts: a touch detection device and a touch controller. Among them, the touch detection device detects the touch position of the object, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it to the processor 1280, and can receive and execute the instructions sent by the processor 1280. In addition, the touch-sensitive surface 1231 can be implemented in multiple types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch-sensitive surface 1231, the input unit 1230 can also include other input devices 1232. Specifically, the other input devices 1232 can include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, power on / off keys, etc.), trackballs, mice, joysticks, etc.

[0080] The display unit 1240 can be used to display information input by an object or information provided to the object, and control various graphical object interfaces of the terminal device 1200. These graphical object interfaces can be composed of graphics, text, icons, videos, and any combination thereof. The display unit 1140 can include a display panel 1241. Optionally, the display panel 1241 can be configured in forms such as LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode). Further, the touch-sensitive surface 1231 can cover the display panel 1241. After the touch-sensitive surface 1231 detects a touch operation on or near it, it is transmitted to the processor 1280 to determine the type of touch event. Subsequently, the processor 1280 provides a corresponding visual output on the display panel 1241 according to the type of touch event. Although in Figure 5 the touch-sensitive surface 1231 and the display panel 1241 are implemented as two independent components to realize input and input functions, in some embodiments, the touch-sensitive surface 1231 and the display panel 1241 can be integrated to realize input and output functions.

[0081] The terminal device 1200 may further include at least one sensor 1250, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor. Among them, the ambient light sensor can adjust the brightness of the display panel 1241 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 1241 or the backlight when the terminal device 1200 is moved to the ear. As a kind of motion sensor, the gravity acceleration sensor can detect the magnitude of acceleration in all directions (generally three axes). When stationary, it can detect the magnitude and direction of gravity, and can be used in applications for identifying the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc. As for other sensors such as gyroscopes, barometers, hygrometers, thermometers, and infrared sensors that the terminal device 1200 may also be configured with, they will not be elaborated here.

[0082] The audio circuit 1260, the speaker 1261, and the microphone 1262 can provide an audio interface between the object and the terminal device 1200. The audio circuit 1260 can transmit the electrical signal converted from the received audio data to the speaker 1261, and the speaker 1261 converts it into a sound signal for output. On the other hand, the microphone 1262 converts the collected sound signal into an electrical signal, which is received by the audio circuit 1260 and then converted into audio data. After the audio data is output to the processor 1280 for processing, it is sent to another electronic device through the RF circuit 1210, or the audio data is output to the memory 1220 for further processing. The audio circuit 1260 may also include an earphone jack to provide communication between the peripheral earphone and the terminal device 1200.

[0083] The short-range wireless transmission module 1270 can be a WIFI (wireless fidelity) module, a Bluetooth module, an infrared module, etc. The terminal device 1200 can transmit information with the wireless transmission modules set on other devices through the short-range wireless transmission module 1270.

[0084] The processor 1280 is the control center of the terminal device 1200, connecting various parts of the entire device through various interfaces and lines. By running or executing software programs or modules stored in the memory 1220, and calling the data stored in the memory 1220, it executes various functions of the terminal device 1200 and processes data, thereby exercising overall control over the device. Optionally, the processor 1280 may include one or more processing cores; optionally, the processor 1280 may integrate an application processor and a modulation and demodulation processor. Among them, the application processor mainly processes the operating system, the object interface, and application programs, etc., and the modulation and demodulation processor mainly processes wireless communication. It can be understood that the above modulation and demodulation processor may not be integrated into the processor 1280.

[0085] The terminal device 1200 further includes a power supply 1290 (such as a battery) for powering each component. Optionally, the power supply 1290 can be logically connected to the processor 1280 through a power management system, so as to manage functions such as charging, discharging, and power consumption management through the power management system. The power supply 1290 can also include any components such as one or more DC or AC power supplies, a recharge system, a power failure detection circuit, a power converter or inverter, and a power status indicator.

[0086] Although not shown, the terminal device 1200 may further include a camera, a Bluetooth module, etc., which will not be elaborated here.

[0087] The embodiment of the present application also discloses a computer-readable storage medium, which stores a program executable by a processor. The program executable by the processor, when executed by the processor, is used to implement the method embodiment as described above.

[0088] It can be understood that the content in the above method embodiment is applicable to this computer-readable storage medium embodiment. The functions specifically implemented by this computer-readable storage medium embodiment are the same as those of the above method embodiment, and the beneficial effects achieved are also the same as those of the above method embodiment.

[0089] The embodiment of the present application also discloses a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in the above computer-readable storage medium; Figure 5 The processor of the shown electronic device can read the computer instructions from the above computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the above method.

[0090] It can be understood that the content in the above method embodiment is applicable to this computer program product or computer program embodiment. The functions specifically implemented by this computer program product or computer program embodiment are the same as those of the above method embodiment, and the beneficial effects achieved are also the same as those of the above method embodiment.

[0091] In some alternative embodiments, the functions / operations recited in the block diagrams may not occur in the order noted in the operational illustrations. For example, depending upon the functionality / operation involved, two blocks shown in succession may actually be executed substantially concurrently or the blocks may sometimes be executed in reverse order. Further, the embodiments presented and described in the flowcharts of the present application are provided by way of example in order to provide a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is altered and in which sub-operations described as part of a larger operation are performed independently.

[0092] Moreover, although the present application has been described in the context of functional modules, it should be understood that one or more of the functions and / or features may be integrated in a single physical device and / or software module unless otherwise stated to the contrary, or one or more functions and / or features may be implemented in separate physical devices or software modules. It should also be understood that a detailed discussion of the actual implementation of each module is not necessary for an understanding of the present application. Rather, given the attributes, functions, and internal relationships of the various functional modules in the devices disclosed herein, the actual implementation of the modules will be understood within the ordinary skill of an engineer. Thus, those of ordinary skill in the art will be able to implement the present application as set forth in the claims without undue experimentation. It should also be understood that the particular concepts disclosed are illustrative only and are not intended to limit the scope of the present application, which is determined by the full scope of the appended claims and their equivalents.

[0093] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application, in essence or the part that contributes to the prior art or a part of this technical solution, can be embodied in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs.

[0094] The logic and / or steps represented in the flowchart or otherwise described herein can, for example, be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable storage medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in conjunction with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable storage medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0095] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0096] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example", or "certain embodiments / examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0097] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

[0098] The above has specifically described the preferred embodiments of the present application, but the present application is not limited to the embodiments. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A control method for a photovoltaic energy storage power supply device, characterized in that, Applied to a photovoltaic energy storage power supply device, the photovoltaic energy storage power supply device includes a battery management unit, a photovoltaic power supply unit, a battery energy storage power supply integrated unit composed of a plurality of battery packs, and a series-parallel switching circuit for each of the battery packs. The battery management unit is connected to the photovoltaic power supply unit, the series-parallel switching circuit, and the battery energy storage power supply integrated unit. The method is executed by the battery management unit, and the method includes: Obtain a first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, a second power state between the photovoltaic power supply unit and a target load unit, and a third power state between the battery management unit and the target load unit; Determine the line connection mode of the series-parallel switching circuit according to the first power state, the second power state, and the third power state; Determine the target connection state between the battery packs according to the line connection mode, so as to adjust the charge and discharge parameters of the battery energy storage power supply integrated unit according to the target connection state.

2. The control method of the photovoltaic energy storage power supply device according to claim 1, wherein, The obtaining of the first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit includes: If the photovoltaic power supply unit discharges to the battery energy storage power supply integrated unit, obtain a first discharge parameter between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, and determine the first power state based on the first discharge parameter; If the photovoltaic power supply unit does not discharge to the battery energy storage power supply integrated unit, determine that the first power state is a state of no photovoltaic power input.

3. The control method of the photovoltaic energy storage power supply device according to claim 2, characterized in that, The second power state is determined through the following steps: If the photovoltaic power supply unit discharges to the target load unit, obtain a second discharge parameter between the photovoltaic power supply unit and the target load unit, and determine the second power state based on the second discharge parameter; If the photovoltaic power supply unit does not discharge to the target load unit, determine that the second power state is a state of no photovoltaic power input.

4. The control method of the photovoltaic energy storage power supply device according to claim 3, characterized in that, The third power state is determined through the following steps: If the battery energy storage power supply integrated unit discharges to the target load unit, obtain a third discharge parameter between the battery energy storage power supply integrated unit and the target load unit, and determine the third power state based on the third discharge parameter; If the target load unit discharges to the battery energy storage power supply integrated unit, obtain a fourth discharge parameter between the battery energy storage power supply integrated unit and the target load unit, and determine the third power state based on the fourth discharge parameter.

5. The control method of the photovoltaic energy storage power supply device according to claim 4, characterized in that, The determining of the line connection mode of the series-parallel switching circuit according to the first power state, the second power state, and the third power state includes: If the first discharge parameter is determined according to the first power state, the second discharge parameter is determined according to the second power state, and the third discharge parameter is obtained according to the third power state, determine that the line connection mode is the first connection mode; If the first discharge parameter is determined based on the first power state, the second discharge parameter is determined based on the second power state, and the fourth discharge parameter is obtained based on the third power state, determine that the line connection mode is the second connection mode; If the first power state is a state without photovoltaic power input, the second discharge parameter is determined based on the second power state, and the third discharge parameter is obtained based on the third power state, determine that the line connection mode is the third connection mode; If both the first power state and the second power state are states without photovoltaic power input, and the third discharge parameter is obtained based on the third power state, determine that the line mode is the fourth connection mode; If both the first power state and the second power state are states without photovoltaic power input, and the fourth discharge parameter is obtained based on the third power state, determine that the line mode is the fifth connection mode.

6. The control method of the photovoltaic energy storage power supply device according to claim 5, wherein Determining the target connection state between each of the battery packs according to the line connection mode includes: If the line connection mode is the first connection mode or the second connection mode, determine that the target connection state is a series-parallel combination state, and the series-parallel combination state is used to represent that some battery packs are connected in series with each other and some battery packs are connected in parallel with each other; If the line connection mode is the third connection mode or the fourth connection mode, determine that the target connection state is a series state, and the series state is used to represent that all battery packs are connected in series with each other or some battery packs are connected in series with each other; If the line connection mode is the fifth connection mode, determine that the target connection state is a parallel state, and the parallel state is used to represent that all battery packs are connected in parallel with each other.

7. The control method of the photovoltaic energy storage power supply device according to claim 1, wherein The target load unit includes a power grid system and an electrical energy load, the photovoltaic energy storage power supply device further includes a power grid monitoring circuit for the power grid system and a load monitoring circuit for the electrical energy load, and the method further includes: Determine a first power supply parameter for the power grid system and a second power supply parameter for the electrical energy load according to the second power state and the third power state; Determine the opening and closing states of the power grid monitoring circuit and / or the load detection circuit according to the first power supply parameter and the second power supply parameter.

8. A control device for a photovoltaic energy storage power supply device, characterized in that, Applied to a photovoltaic energy storage power supply device, the photovoltaic energy storage power supply device includes a battery management unit, a photovoltaic power supply unit, a battery energy storage power supply integrated unit composed of a plurality of battery packs, and a series-parallel switching circuit for each of the battery packs. The battery management unit is connected to the photovoltaic power supply unit, the series-parallel switching circuit, and the battery energy storage power supply integrated unit. The method is executed in the battery management unit, and the device includes: An acquisition unit for acquiring a first power state between the photovoltaic power supply unit and the battery energy storage power supply integrated unit, a second power state between the photovoltaic power supply unit and the target load unit, and a third power state between the battery management unit and the target load unit; A first determination unit, configured to determine a line connection mode of the series-parallel switching circuit according to the first power state, the second power state, and the third power state; A second determination unit, configured to determine a target connection state between the battery packs according to the line connection mode, so as to adjust charge and discharge parameters of the battery energy storage and power supply unit according to the target connection state.

9. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory stores a computer program, and when the processor executes the computer program, the control method of the photovoltaic energy storage and power supply device according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, the control method of the photovoltaic energy storage and power supply device according to any one of claims 1 to 7 is implemented.

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