Photovoltaic energy storage system, control method of photovoltaic energy storage system, and electronic device

Abstract

The present application relates to the technical field of photovoltaic energy storage, and discloses a photovoltaic energy storage system, a control method of the photovoltaic energy storage system and electronic equipment. The present application indirectly controls the closing or opening of a dual-power switching module through a first electrically operated circuit breaker and / or a second electrically operated circuit breaker, instead of directly controlling the dual-power switching module, so as to not only realize low-cost control of the photovoltaic energy storage system, but also utilize the arc extinguishing capability of the electrically operated circuit breaker itself to guarantee the reliability of the control of the photovoltaic energy storage system.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic energy storage technology, specifically to a photovoltaic energy storage system, a control method for the photovoltaic energy storage system, and electronic equipment. Background Technology

[0002] With the development of new energy sources, photovoltaic energy storage systems are becoming increasingly popular. Photovoltaic energy storage systems typically connect to the grid via photovoltaic inverters and energy storage cabinets for photovoltaic energy storage control. However, most electricity users are unwilling to install energy storage cabinets for grid connection because grid connection requires application procedures, grid quality is sometimes poor, the requirements are complex, and the costs are high. Therefore, a dual-power switch module is needed to bind the energy storage cabinet to the photovoltaic power generation module. The energy storage cabinet is used when off-grid, allowing the grid and either the photovoltaic or energy storage system to continuously supply power to the load. This keeps the energy storage in an off-grid state, thus satisfying the requirement of photovoltaic energy storage as a primary energy source.

[0003] In related technologies, when using dual power switching modules for photovoltaic energy storage control, the energy storage control module and the dual power switching module generally need to communicate and control directly. However, since the dual power switching module does not have arc extinguishing capability, it is prone to damage and failure when switching under power. If another dual power switching module is developed, the communication protocol still needs to be re-established, which leads to increased control costs and poor reliability. Summary of the Invention

[0004] This invention provides a control method, device, and electronic equipment for a photovoltaic energy storage system, in order to solve the problems of increased control costs and poor reliability when using a dual power switching module and an energy storage control module for communication control.

[0005] In a first aspect, the present invention discloses a photovoltaic energy storage system, the system comprising: The target load is used to generate the power supply load. The power grid is used to provide mains power to the target load; Energy storage batteries are used to provide backup power to the target load. Photovoltaic power generation modules are used to provide photovoltaic power to target loads and / or energy storage batteries; The dual power supply switching module has its first side connected to the power grid via a first electrically operated circuit breaker, and its second side connected to the photovoltaic power generation module and the energy storage battery via a second electrically operated circuit breaker. An energy storage control module, connected to a first electrically operated circuit breaker and a second electrically operated circuit breaker; used to control the first and / or second electrically operated circuit breakers to close or open based on the current remaining charge of the energy storage battery, so that the dual power supply switching module performs switching actions in photovoltaic energy storage mode; or, Used to control the second electrically operated circuit breaker to close or open based on the current remaining charge of the energy storage battery or the monitoring time, so that the dual power supply switching module can perform switching actions in standby mode; or, Used to control the closing of the first and second electrically operated circuit breakers in the start-up mode, and to switch from the start-up mode to the backup power mode when the current remaining power of the energy storage battery is greater than a first preset threshold, wherein the first preset threshold is the first lower limit value of the energy storage battery.

[0006] Secondly, the present invention provides a control method for a photovoltaic energy storage system, used in a photovoltaic energy storage system, the method comprising: Control the first electrically operated circuit breaker and / or the second electrically operated circuit breaker to close or open, so that the dual power supply switching module performs a switching action in photovoltaic energy storage mode; or, Based on the current remaining charge of the energy storage battery or the monitoring time, control the second electrically operated circuit breaker to close or open, so that the dual power supply switching module can perform switching actions in standby mode; or, In startup mode, the first and second electrically operated circuit breakers are controlled to close, and when the current remaining power of the energy storage battery is greater than the first preset threshold, the startup mode is switched to the backup power mode. The first preset threshold is the first lower limit value of the energy storage battery.

[0007] In some alternative implementations, controlling the first or second electrically operated circuit breaker to close or open causes the dual-power switching module to perform a switching action in photovoltaic energy storage mode, including: In response to the connection of the power grid and photovoltaic power generation modules, power is supplied to the target load through energy storage batteries and photovoltaic power generation modules; During the process of energy storage batteries and photovoltaic power generation modules supplying power to the target load, the action of monitoring the current remaining power of the energy storage batteries is initiated; Based on the change in the current remaining charge of the energy storage battery, the first and / or second electrically operated circuit breakers are controlled to close or open, so that the dual power supply switching module can perform switching actions in photovoltaic energy storage mode.

[0008] In some optional implementations, the first and / or second electrically operated circuit breakers are controlled to close or open based on changes in the current remaining charge of the energy storage battery, so that the dual-power switching module performs a switching action in photovoltaic energy storage mode, including: When the current remaining power of the energy storage battery reaches the second preset threshold, the first and second electrically operated circuit breakers are controlled to open, and power is supplied to the target load through the energy storage battery; the second preset threshold is the upper limit of the energy storage battery. When the current remaining power of the energy storage battery drops from the second preset threshold to the third preset threshold, the second electrically operated circuit breaker is closed, and photovoltaic power is transmitted to the target load through the photovoltaic power generation module. When the power of the photovoltaic power generation module is greater than the power of the target load, the photovoltaic power generation module transmits the photovoltaic power to the target load, and after the photovoltaic power generation module distributes the photovoltaic power to the target load, the remaining photovoltaic power is used to power the energy storage battery. When the electrical energy of the photovoltaic power generation module is less than or equal to the electrical energy of the target load, the target load is powered by the energy storage battery and the photovoltaic power generation module together.

[0009] In some optional implementations, the first and / or second electrically operated circuit breakers are controlled to close or open based on changes in the current remaining charge of the energy storage battery, so that the dual-power switching module performs a switching action in photovoltaic energy storage mode, and the method further includes: When the current remaining power of the energy storage battery drops from the third preset threshold to the first preset threshold, the first electrically operated circuit breaker is controlled to close, and the mains power is supplied to the target load through the grid, while waiting for the photovoltaic power generation module to transmit photovoltaic power to the energy storage battery; When the remaining charge of the energy storage battery drops from the first preset threshold to the fourth preset threshold, the photovoltaic power generation module has not yet transmitted photovoltaic power to the energy storage battery, and the energy storage control module automatically shuts down; the fourth preset threshold is the second lower limit value of the energy storage battery. When the monitoring time reaches the preset time point, the energy storage control module will automatically start. When the remaining charge of the energy storage battery drops from the fourth preset threshold to the fifth preset threshold, and the photovoltaic power generation module still fails to transmit photovoltaic power to the energy storage battery, the staff is prompted to repair the photovoltaic power generation module. The fifth preset threshold is the third lower limit value of the energy storage battery.

[0010] In some optional implementations, the second electrically operated circuit breaker is controlled to close or open based on the current remaining charge of the energy storage battery or the monitoring time, so that the dual power supply switching module performs a switching action in standby mode, including: In response to the connection of the power grid and photovoltaic power generation modules, power is supplied to the target load through energy storage batteries and photovoltaic power generation modules; While the energy storage battery and photovoltaic power generation module are supplying power to the target load, the current remaining power of the energy storage battery is monitored. Based on the change in the current remaining power of the energy storage battery or the monitoring time, the second electrically operated circuit breaker is controlled to close or open, so that the dual power supply switching module can perform switching actions in standby mode.

[0011] In some optional implementations, the second electrically operated circuit breaker is controlled to close or open based on the current remaining charge of the energy storage battery or the monitoring time, so that the dual power supply switching module performs a switching action in standby mode, including: When the current remaining power of the energy storage battery reaches the first preset threshold, the second electrically operated circuit breaker is controlled to open, and power is supplied to the target load through the energy storage battery. When the current remaining charge of the energy storage battery drops from the first preset threshold to the third preset threshold, the second electrically operated circuit breaker is closed to supply power to the target load through the power grid. When the monitoring time falls within a preset time period, power is supplied to the target load through the power grid, with the energy storage battery serving as a backup battery.

[0012] In some optional implementations, the second electrically operated circuit breaker is controlled to close or open based on the current remaining charge of the energy storage battery or the monitoring time, so that the dual power supply switching module performs a switching action in backup power mode, and the method further includes: When the remaining power of the energy storage battery drops from the third preset threshold to the first preset threshold, power is supplied to the target load through the grid, and the photovoltaic power generation module is waiting to transmit photovoltaic power to the energy storage battery. When the remaining charge of the energy storage battery drops from the first preset threshold to the fourth preset threshold, and the photovoltaic power generation module has not yet transmitted photovoltaic power to the energy storage battery, the energy storage control module automatically shuts down; the fourth preset threshold is the second lower limit value of the energy storage battery. When the monitoring time reaches the preset time point, the energy storage control module will automatically shut down; When the remaining power of the energy storage battery drops from the fourth preset threshold to the fifth preset threshold, the staff is prompted to inspect the photovoltaic power generation module.

[0013] In some optional implementations, the control method for the photovoltaic energy storage system further includes: In startup mode, when the current remaining power of the energy storage battery is less than the fifth preset threshold and the power grid is not connected, the operator is prompted to disconnect the target load.

[0014] Thirdly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the control method of the photovoltaic energy storage system described in the first aspect or any corresponding embodiment thereof.

[0015] The technical solution of this invention has the following advantages: This invention relates to the field of photovoltaic energy storage technology, and discloses a photovoltaic energy storage system, a control method for the photovoltaic energy storage system, and electronic equipment. This invention indirectly controls the closing or opening of a dual-power switching module through a first electrically operated circuit breaker and / or a second electrically operated circuit breaker, rather than directly controlling the dual-power switching module. This not only achieves low-cost control of the photovoltaic energy storage system, but also utilizes the arc-extinguishing capability of the electrically operated circuit breaker itself to ensure the reliability of the photovoltaic energy storage system control. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a photovoltaic energy storage system according to an embodiment of the present invention; Figure 2 This is a first flowchart illustrating the control method of a photovoltaic energy storage system according to an embodiment of the present invention; Figure 3 This is a second flowchart illustrating the control method of a photovoltaic energy storage system according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the third process of the control method for a photovoltaic energy storage system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the fourth process of the control method for a photovoltaic energy storage system according to an embodiment of the present invention; Figure 6 This is a fifth flowchart illustrating the control method for a photovoltaic energy storage system according to an embodiment of the present invention. Figure 7 This is a structural block diagram of the control device for a photovoltaic energy storage system according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] This embodiment provides a photovoltaic energy storage system, such as Figure 1 As shown, the photovoltaic energy storage system includes: target load 11, power grid 12, energy storage battery 13, photovoltaic power generation module 14, dual power switching module 15, and energy storage control module 16.

[0022] Among them, Figure 1 In the middle, target load 11 is used to generate power supply load.

[0023] Specifically, the power consumption of the target load can be no more than 100KW. The target load includes a first-level target load and a second-level target load, with the first-level target load having a higher importance than the second-level target load. Therefore, the first-level target load is the important load, and the second-level target load is the secondary load. In the event of a power outage, the secondary load should be quickly disconnected to ensure the continued operation of the important load. The secondary load will resume operation when power is restored.

[0024] Among them, Figure 1 In the middle, power grid 12 is used to provide mains power to the target load 11. The voltage of this power grid is 220V.

[0025] Among them, Figure 1 In the middle, the energy storage battery 13 is used to provide backup power to the target load 11.

[0026] Among them, Figure 1 In the middle, the photovoltaic power generation module 14 is used to provide photovoltaic power to the target load 11 and / or the energy storage battery.

[0027] Specifically, the photovoltaic power generation module 14 includes a photovoltaic panel and a photovoltaic inverter, wherein the photovoltaic inverter is used to convert the electrical energy output by the photovoltaic panel into energy.

[0028] Among them, Figure 1 In the middle, the dual power supply switching module 15 has its first side connected to the power grid 12 through the first electrically operated circuit breaker 17, and its second side connected to the photovoltaic power generation module 14 and the energy storage battery 13 through the second electrically operated circuit breaker 18.

[0029] The dual power transfer module can be a dual power transfer switch, with the first side being the primary power side and the second side being the backup power side. The primary power side is connected to the power grid, and the backup power side is connected to the energy storage battery and the photovoltaic power generation module.

[0030] This embodiment indirectly controls the closing or opening of the dual power supply switching module through the first and / or second electrically operated circuit breakers, rather than directly controlling the dual power supply switching module. It utilizes the arc-extinguishing capability of the electrically operated circuit breakers themselves to ensure the reliability of the photovoltaic energy storage system control.

[0031] In this embodiment, a photovoltaic power generation module has been installed for AC grid connection, but at the same time, an energy storage battery has been installed to store the photovoltaic energy that is not used during the day. In order to avoid grid connection, a dual power supply switching module is used to switch between the first side and the second side. By choosing between the grid and the energy storage battery, the target load is continuously powered, ensuring that the energy storage battery is not connected to the grid.

[0032] Automatic transfer switches (ATS) include PC-class standard models, CB-class models with built-in circuit breakers, and PC-class fast models.

[0033] The PC-class standard model has a switching time of approximately 100ms (the switching process can ensure uninterrupted power supply to most inductive and resistive loads such as motors and lights). It lacks an electrically operated circuit breaker and requires an energy storage control module to communicate with the ATS for control. However, this PC-class standard ATS lacks arc-extinguishing capability, leading to rapid damage during live switching. Replacing it with a different brand of ATS would require developing a new communication protocol, increasing development costs.

[0034] The CB-class model with a built-in circuit breaker has arc-extinguishing capability and a switching time of approximately 300ms, during which the load will essentially lose power. It still requires communication and control with the energy storage control module; if a different ATS is used, the communication control system needs to be redeveloped.

[0035] The PC-level fast-speed model has a switching time of ≤20ms and can meet the uninterrupted power requirements of all loads except high-precision instruments. However, it is extremely expensive, costing about ten times that of the ordinary model, and also requires an energy storage control module for communication control.

[0036] In summary, when using dual power switch modules for photovoltaic energy storage control, the energy storage module and the dual power switch module generally need to communicate and control each other directly. However, since the dual power switch module does not have arc extinguishing capability, it is prone to damage and failure when switching under power. If another dual power switch module is developed, the communication protocol still needs to be re-established, which will increase the development cost.

[0037] Among them, Figure 1In the middle, the energy storage control module is connected to the first and second electrically operated circuit breakers, and is used to control the first and / or second electrically operated circuit breakers to close or open according to the current remaining power of the energy storage battery, so that the dual power switching module performs a switching action in photovoltaic energy storage mode; or, it is used to control the second electrically operated circuit breaker to close or open according to the current remaining power of the energy storage battery or the monitoring time, so that the dual power switching module performs a switching action in standby mode; or, it is used to control the first and second electrically operated circuit breakers to close in the start-up mode, and switch from the start-up mode to the standby mode when the current remaining power of the energy storage battery is greater than a first preset threshold, wherein the first preset threshold is a first lower limit value of the energy storage battery.

[0038] The energy storage control module in this embodiment belongs to an Energy Management System (EMS). When using a dual-power switching module for photovoltaic energy storage control, the photovoltaic inverter and energy storage cabinet are typically AC-coupled and operate off-grid. In this case, the EMS usually needs to communicate with the photovoltaic inverter to control its startup and shutdown, preventing overcharging of the energy storage battery. However, there are many photovoltaic inverter manufacturers, and customers often cannot obtain their communication protocols. Therefore, a solution is needed that avoids overcharging of the energy storage battery without requiring communication, while also ensuring uninterrupted power supply to the target load.

[0039] Therefore, the solution in this embodiment is to control the on / off state of the photovoltaic inverter by adding an electrically operated circuit breaker, without requiring communication between the photovoltaic inverter and the EMS. Specifically, the dual-power switching module in this embodiment uses a PC-grade ATS, with a switching time of approximately 100ms (the switching process can ensure uninterrupted power supply to most inductive and resistive loads such as motors and lights). Combined with the electrically operated circuit breaker, there is no need for communication control between it and the energy storage control module or the photovoltaic power generation module. The energy storage control module can control the electrically operated circuit breaker without communicating with the ATS, allowing for easy switching of ATS brands and rapid adaptation to different needs. Furthermore, the EMS development cost is low, and corresponding controls can be executed in photovoltaic energy storage mode, backup power mode, and start-up mode.

[0040] This embodiment provides a control method for a photovoltaic energy storage system, which can be used in computer devices such as mobile phones, tablets, desktop computers, laptops, and servers. Specifically, it can be applied to the dual power supply switching module of a photovoltaic energy storage system. Figure 2 This is a flowchart of a control method for a photovoltaic energy storage system according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps: Step S101: Control the first electrically operated circuit breaker and / or the second electrically operated circuit breaker to close or open, so that the dual power supply switching module performs a switching action in photovoltaic energy storage mode; or, Step S102: Based on the current remaining charge of the energy storage battery or the monitoring time, control the second electrically operated circuit breaker to close or open, so that the dual power supply switching module performs a switching action in standby mode; or, Step S103: In the start-up mode, control the first and second electrically operated circuit breakers to close, and when the current remaining power of the energy storage battery is greater than the first preset threshold, switch from the start-up mode to the backup power mode. The first preset threshold is the first lower limit value of the energy storage battery.

[0041] In some specific implementations, in startup mode, when the current remaining power of the energy storage battery is less than a fifth preset threshold and the power grid is not connected, the operator is prompted to disconnect the target load.

[0042] Specifically, the first preset threshold can be 25%, and the fifth preset threshold can be 15%. These thresholds can be flexibly set based on actual conditions. In startup mode, the first and second electrically operated circuit breakers are closed. When the current remaining charge of the energy storage battery is greater than the first preset threshold (25%), the system switches from startup mode to backup mode to prevent the energy storage battery from running out of power again. When the current remaining charge of the energy storage battery is less than the fifth preset threshold (15%), it indicates that the energy storage capacity is low. At this time, the power grid is depleted, and manual control of the target load is required to disconnect it to prevent the target load from rapidly depleting the energy storage battery's charge, thus causing insufficient charge in the energy storage battery.

[0043] When using dual power switch modules for photovoltaic energy storage control, the energy storage module and the dual power switch module generally need to communicate and control each other directly. However, since the dual power switch module does not have arc extinguishing capability, it is prone to damage and failure when switching under power. If another dual power switch module is developed, the communication protocol still needs to be re-established, which will increase the development cost.

[0044] Therefore, in this embodiment, the control method of the photovoltaic energy storage system does not directly control the dual power switching module, but controls the first and / or second electrically operated circuit breakers to close or open, so that the dual power switching module performs switching actions in photovoltaic energy storage mode; or, according to the current remaining power of the energy storage battery or the monitoring time, controls the second electrically operated circuit breaker to close or open, so that the dual power switching module performs switching actions in standby mode; or, in the start-up mode, controls the first and second electrically operated circuit breakers to close, and when the current remaining power of the energy storage battery is greater than a first preset threshold (25%), switches from the start-up mode to the standby mode, where the first preset threshold (25%) is the first lower limit value of the energy storage battery.

[0045] Therefore, in this embodiment, the electrically operated circuit breaker does not need to communicate with the energy storage control module. The energy storage control module can directly control the electrically operated circuit breaker without communicating with the ATS. This allows for easy replacement of the ATS brand and quick switching to meet different needs. Moreover, the EMS control cost is low, and corresponding control can be performed in photovoltaic energy storage mode, backup power mode, and start-up mode.

[0046] This embodiment provides a control method for a photovoltaic energy storage system, which can be used in computer devices such as mobile phones, tablets, desktop computers, laptops, and servers. Specifically, it can be applied to the dual power supply switching module of a photovoltaic energy storage system. Figure 3 This is a flowchart of a control method for a photovoltaic energy storage system according to an embodiment of the present invention, such as... Figure 3 As shown, step S101 above controls the first or second electrically operated circuit breaker to close or open, so that the dual power supply switching module can perform a switching action in photovoltaic energy storage mode. This process includes the following steps: In step S1011, in response to the connection between the power grid and the photovoltaic power generation module, power is supplied to the target load through the energy storage battery and the photovoltaic power generation module.

[0047] Specifically, in the initial stage, when the power grid is connected to the photovoltaic power generation module, the energy storage battery and the photovoltaic power generation module are used first to supply power to the target load, and the energy storage battery's power comes from the photovoltaic power generation module.

[0048] Step S1012: During the process of the energy storage battery and photovoltaic power generation module supplying power to the target load, the action of monitoring the current remaining power of the energy storage battery is initiated.

[0049] Specifically, the current remaining charge of the energy storage battery is represented by SOC. During the process of the energy storage battery supplying power to the target load, the current remaining charge of the energy storage battery is monitored.

[0050] Step S1013: Based on the change in the current remaining power of the energy storage battery, control the first and / or second electrical circuit breakers to close or open, so that the dual power supply switching module can perform switching actions in photovoltaic energy storage mode.

[0051] This embodiment targets the photovoltaic energy storage mode, prioritizing the use of backup power stored in the energy storage battery to supply power to the target load. Based on the current remaining power of the energy storage battery, it controls the first and / or second electrically operated circuit breakers to perform switching actions on the dual power switching module. Thus, without direct communication and control with the dual power switching module, it can achieve low-cost control of the photovoltaic energy storage system. At the same time, it can also utilize the arc extinguishing capability of the electrically operated circuit breaker to ensure the arc extinguishing effect of the indirectly controlled dual power switching module.

[0052] This embodiment provides a control method for a photovoltaic energy storage system, which can be used in computer devices such as mobile phones, tablets, desktop computers, laptops, and servers. Specifically, it can be applied to the dual power supply switching module of a photovoltaic energy storage system. Figure 4 This is a flowchart of a control method for a photovoltaic energy storage system according to an embodiment of the present invention, such as... Figure 4 As shown, in step S1013 above, based on the change in the current remaining charge of the energy storage battery, the first and / or second electrically operated circuit breakers are controlled to close or open, so that the dual power supply switching module performs a switching action in photovoltaic energy storage mode. This process includes the following steps: Step S10131: When the current remaining power of the energy storage battery reaches the second preset threshold (100%), control the first and second electric circuit breakers to open, and supply power to the target load through the energy storage battery; the second preset threshold (100%) is the upper limit of the energy storage battery.

[0053] Specifically, the second preset threshold can be 100%, or it can be flexibly set. The current remaining capacity of the energy storage battery is represented by SOC. When the SOC of the energy storage battery reaches the second preset threshold (100%), the second preset threshold can be flexibly set according to the actual situation. The first electrically operated circuit breaker opens, thereby disconnecting the power grid. The dual power supply switching module switches the power supply to the backup power side, the second electrically operated circuit breaker also opens, and the photovoltaic energy storage power generation module stops generating electricity to avoid overcharging the energy storage battery.

[0054] Step S10132: When the current remaining power of the energy storage battery drops from the second preset threshold to the third preset threshold, control the second electrically operated circuit breaker to close. Step S10133: When the power of the photovoltaic power generation module is greater than the power of the target load, the photovoltaic power generation module transmits the photovoltaic power to the target load, and after the photovoltaic power generation module distributes the photovoltaic power to the target load, the remaining photovoltaic power is used to power the energy storage battery.

[0055] Step S10334: When the power of the photovoltaic power generation module is less than or equal to the power of the target load, the target load is powered by the energy storage battery and the photovoltaic power generation module together.

[0056] Specifically, the third preset threshold can be 95%, or it can be flexibly set. When the SOC of the energy storage battery drops from the second preset threshold (100%) to the third preset threshold (95%), after the first electrically operated circuit breaker of the power grid opens, the second electrically operated circuit breaker closes, and photovoltaic power is transmitted to the target load through the photovoltaic power generation module. After the photovoltaic power generation module distributes the photovoltaic power to the target load, the remaining photovoltaic power is used to power the energy storage battery. For example, if the total power generated by the photovoltaic power generation module is 50KW and the target load requires 20KW, then the remaining 30KW is transmitted to the energy storage battery; if the target load is less than 60KW, then the photovoltaic power generation module provides 50KW to the target load, and at the same time, the energy storage battery also needs to provide 10KW to the target load.

[0057] In step S10135, when the current remaining power of the energy storage battery drops from the third preset threshold to the first preset threshold, the first electrically operated circuit breaker is controlled to close, and mains power is supplied to the target load through the grid, while waiting for the photovoltaic power generation module to transmit photovoltaic power to the energy storage battery.

[0058] Specifically, the third preset threshold (95%) and the first preset threshold (25%) in this embodiment can be flexibly set according to the actual situation. When the SOC of the energy storage battery drops from the third preset threshold (95%) to the first preset threshold (25%), the first electrically operated circuit breaker is closed, thereby connecting the power grid and providing mains power to the target load through the power grid, while waiting for the photovoltaic power generation module to transmit photovoltaic power to the energy storage battery. At this time, it means that the energy storage battery has little power and needs to output power, waiting for the photovoltaic power generation module to replenish the energy storage battery.

[0059] Step S10136: When the current remaining power of the energy storage battery drops from the first preset threshold to the fourth preset threshold, the photovoltaic power generation module has not yet transmitted photovoltaic power to the energy storage battery, and the energy storage control module automatically shuts down; the fourth preset threshold is the second lower limit value of the energy storage battery.

[0060] Step S10137: When the monitoring time reaches the preset time point, the energy storage control module automatically starts up.

[0061] Specifically, the fourth preset threshold can be 20%, but can be flexibly set according to actual conditions. At this time, both the first and second electrically operated circuit breakers are in the closed state. If the SOC of the energy storage battery is between 25% and 20% and there is still no photovoltaic power supply, it is considered that there is no photovoltaic power supply, and the energy storage control module enters the shutdown mode (0 output). A 5% SOC of the energy storage battery can support the system standby for at least 6 hours. The SOC threshold can also be adjusted on-site according to actual conditions to ensure that more energy is used for the target load. The preset time point can be 9:00, but can be flexibly set according to actual conditions. When the monitoring time reaches the preset time point, the energy storage control module automatically turns on, and the photovoltaic power generation module automatically enters the power generation mode.

[0062] Step S10138: When the current remaining power of the energy storage battery drops from the fourth preset threshold to the fifth preset threshold, and the photovoltaic power generation module still does not transmit photovoltaic power to the energy storage battery, the staff is prompted to inspect the photovoltaic power generation module. The fifth preset threshold is the third lower limit value of the energy storage battery.

[0063] Specifically, the fifth preset threshold can be 15%, but it can also be flexibly set according to the actual situation. If the SOC of the energy storage battery drops from 20% to 15% and there is no photovoltaic power generation module to replenish the energy storage battery, the staff should be prompted to inspect the photovoltaic power generation module.

[0064] This embodiment controls the first and / or second electrically operated circuit breakers to close or open based on the change in the current remaining charge of the energy storage battery, i.e., the SOC changes from 100% to 15%, so that the dual power supply switching module can perform switching actions in photovoltaic energy storage mode. Thus, in photovoltaic energy storage mode, the dual power supply switching module is not directly controlled, achieving efficient control of the photovoltaic energy storage system, while also ensuring the reliability of photovoltaic energy storage control.

[0065] This embodiment provides a control method for a photovoltaic energy storage system, which can be used in computer devices such as mobile phones, tablets, desktop computers, laptops, and servers. Specifically, it can be applied to the dual power supply switching module of a photovoltaic energy storage system. Figure 5 This is a flowchart of a control method for a photovoltaic energy storage system according to an embodiment of the present invention, such as... Figure 5 As shown, in step S102 above, based on the current remaining power of the energy storage battery or the monitoring time, the second electrically operated circuit breaker is controlled to close or open, so that the dual power supply switching module can perform a switching action in the backup power mode. This process includes the following steps: In step S1021, in response to the connection between the power grid and the photovoltaic power generation module, power is supplied to the target load through the energy storage battery and the photovoltaic power generation module.

[0066] Specifically, in the initial stage, when the power grid is connected to the photovoltaic power generation module, the energy storage battery and the photovoltaic power generation module are used first to supply power to the target load, and the energy storage battery's power comes from the photovoltaic power generation module.

[0067] Step S1022: During the process of the energy storage battery and photovoltaic power generation module supplying power to the target load, start monitoring the current remaining power of the energy storage battery.

[0068] Step S1023: Based on the change in the current remaining power of the energy storage battery or the monitoring time, control the second electric circuit breaker to close or open, so that the dual power supply switching module can perform switching actions in standby mode.

[0069] This embodiment targets the backup power mode, prioritizing the use of the power grid to supply power to the target load. Based on the current remaining power of the energy storage battery or the monitoring time, it controls the second electrically operated circuit breaker to perform a switching action on the dual power switching module. Thus, without direct communication and control with the dual power switching module, it can achieve low-cost control of the photovoltaic energy storage system. At the same time, it can also utilize the arc-extinguishing capability of the electrically operated circuit breaker to ensure the arc-extinguishing effect of the indirectly controlled dual power switching module.

[0070] This embodiment provides a control method for a photovoltaic energy storage system, which can be used in computer devices such as mobile phones, tablets, desktop computers, laptops, and servers. Specifically, it can be applied to the dual power supply switching module of a photovoltaic energy storage system. Figure 6 This is a flowchart of a control method for a photovoltaic energy storage system according to an embodiment of the present invention, such as... Figure 6 As shown, in step S1023 above, based on the change in the current remaining power of the energy storage battery or the monitoring time, the second electrically operated circuit breaker is controlled to close or open, so that the dual power supply switching module can perform a switching action in the backup power mode. This process includes the following steps: Step S10231: When the current remaining power of the energy storage battery reaches the first preset threshold, control the second electrically operated circuit breaker to open and supply power to the target load through the energy storage battery.

[0071] Specifically, the current remaining charge of the energy storage battery is represented by SOC. When the SOC of the energy storage battery reaches a second preset threshold (100%), the second preset threshold can be flexibly set according to actual conditions. The second electrical circuit breaker opens, thereby disconnecting the photovoltaic power generation module. The dual power supply switching module switches the power supply to the backup power side, the second electrical circuit breaker also opens, and the photovoltaic energy storage power generation module stops generating electricity to avoid overcharging the energy storage battery.

[0072] Step S10232: When the current remaining power of the energy storage battery drops from the first preset threshold to the third preset threshold, control the second electrically operated circuit breaker to close and supply power to the target load through the power grid.

[0073] Specifically, the third preset threshold (95%) and the first preset threshold (25%) in this embodiment can be flexibly set according to the actual situation. When the SOC of the energy storage battery drops from the third preset threshold (95%) to the first preset threshold (25%), the second electrically operated circuit breaker is closed, thereby connecting the photovoltaic power generation module, which provides mains power to the target load through the photovoltaic power generation module, and supplies power to the target load through the power grid.

[0074] Step S10233: When the monitoring time falls within a preset time period, power is supplied to the target load through the power grid, with the energy storage battery serving as a backup battery.

[0075] Specifically, the preset time period can be set to 00-24h, 18-8:00, mainly using the power grid to supply power to the target load, with the energy storage battery as a backup battery.

[0076] Step S10234: When the current remaining power of the energy storage battery drops from the third preset threshold to the first preset threshold, power is supplied to the target load through the power grid, and the photovoltaic power generation module is waiting to transmit photovoltaic power to the energy storage battery.

[0077] Step S10235: When the current remaining power of the energy storage battery drops from the first preset threshold to the fourth preset threshold, and the photovoltaic power generation module has not yet transmitted photovoltaic power to the energy storage battery, the energy storage control module automatically shuts down; the fourth preset threshold is the second lower limit value of the energy storage battery.

[0078] Specifically, the third preset threshold (95%) and the first preset threshold (25%) in this embodiment can be flexibly set according to the actual situation. When the SOC of the energy storage battery drops from the third preset threshold (95%) to the first preset threshold (25%), the second electrically operated circuit breaker is closed, thereby connecting the photovoltaic power generation module, providing mains power to the target load through the grid, and waiting for the photovoltaic power generation module to transmit photovoltaic power to the energy storage battery. At this time, it means that the energy storage battery has little power and needs to output power, waiting for the photovoltaic power generation module to replenish the energy storage battery.

[0079] Step S10236: When the monitoring time reaches the preset time point, the energy storage control module automatically shuts down.

[0080] Specifically, the preset time point can be set to 9:00, and the specific time can be flexibly set according to the actual situation. When the monitoring time reaches the preset time point, the energy storage control module will automatically shut down.

[0081] Step S10237: When the current remaining power of the energy storage battery drops from the fourth preset threshold to the fifth preset threshold, the staff is prompted to inspect the photovoltaic power generation module.

[0082] Specifically, the fifth preset threshold (15%) can also be flexibly set according to the actual situation. If the SOC of the energy storage battery drops from 20% to 15% and there is still no photovoltaic power generation module to replenish the energy storage battery, it is necessary to prompt the staff to inspect the photovoltaic power generation module.

[0083] This embodiment controls the second electrically operated circuit breaker to close or open based on the change in the current remaining power of the energy storage battery, i.e., the change in SOC from 100% to 15%, so that the dual power switching module can perform switching actions in the backup power mode. In the backup power mode, the dual power switching module is not directly controlled, so as to achieve efficient control of the photovoltaic energy storage system and at the same time ensure the reliability of photovoltaic energy storage control.

[0084] This embodiment also provides a control device for a photovoltaic energy storage system, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0085] This invention provides a control device for a photovoltaic energy storage system, used in a photovoltaic energy storage system, such as... Figure 7 As shown, the device includes: The first control module 701 is used to close or open the first electrically operated circuit breaker and / or the second electrically operated circuit breaker, so that the dual power supply switching module can perform switching actions in photovoltaic energy storage mode; or... The second control module 702 is used to control the second electrically operated circuit breaker to close or open based on the current remaining power of the energy storage battery or the monitoring time, so that the dual power supply switching module can perform switching actions in standby mode; or, The third control module 703 is used to control the closing of the first and second electrically operated circuit breakers in the startup mode, and to switch from the startup mode to the backup power mode when the current remaining power of the energy storage battery is greater than a first preset threshold. The first preset threshold is the first lower limit value of the energy storage battery.

[0086] The control device for the photovoltaic energy storage system provided in this embodiment of the invention can execute the control method for the photovoltaic energy storage system provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the various modules and units described above are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0087] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0088] The following is a detailed reference. Figure 8 , Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0089] The following is a detailed reference. Figure 8 The diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, graphics processor, etc.) 801, which can perform various appropriate actions and processes based on a program stored in a read-only memory (ROM) 802 or a program loaded from memory 808 into random access random access memory (RAM) 803. The RAM 803 also stores various programs and data required for the operation of the electronic device. The processor 801, ROM 802, and RAM 803 are interconnected via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0090] Typically, the following devices can be connected to I / O interface 805: input devices 806 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 807 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 808 including, for example, magnetic tapes, hard disks, etc.; and communication devices 809. Communication device 809 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 8 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0091] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 809, or installed from a memory 808, or installed from a ROM 802. When the computer program is executed by the processor 801, it performs the functions defined in the control method of the photovoltaic energy storage system of the embodiments of the present invention.

[0092] Figure 8 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0093] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the control method of the photovoltaic energy storage system shown in the above embodiments is implemented.

[0094] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0095] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A photovoltaic energy storage system, characterized in that, The system includes: The target load is used to generate the power supply load. The power grid is used to provide mains power to the target load; An energy storage battery is used to provide backup power to the target load. A photovoltaic power generation module is used to provide photovoltaic power to the target load and / or the energy storage battery; The dual power switching module has its first side connected to the power grid via a first electrically operated circuit breaker, and its second side connected to the photovoltaic power generation module and the energy storage battery via a second electrically operated circuit breaker. An energy storage control module, connected to the first and second electrically operated circuit breakers, is used to control the first and / or second electrically operated circuit breakers to close or open based on the current remaining charge of the energy storage battery, so that the dual-power switching module performs a switching action in photovoltaic energy storage mode; or, Used to control the second electrically operated circuit breaker to close or open based on the current remaining charge of the energy storage battery or the monitoring time, so that the dual power supply switching module can perform a switching action in standby mode; or, Used to control the closing of the first and second electrically operated circuit breakers in the startup mode, and to switch from the startup mode to the backup power mode when the current remaining power of the energy storage battery is greater than a first preset threshold, wherein the first preset threshold is a first lower limit value of the energy storage battery.

2. A control method for a photovoltaic energy storage system, characterized in that, The method for the photovoltaic energy storage system of claim 1 includes: Controlling the first and / or second electrically operated circuit breakers to close or open, so that the dual power supply switching module performs a switching action in photovoltaic energy storage mode; or, Based on the current remaining charge of the energy storage battery or the monitoring time, the second electrically operated circuit breaker is controlled to close or open, so that the dual power supply switching module performs a switching action in standby mode; or, In startup mode, the first and second electrically operated circuit breakers are controlled to close, and when the current remaining power of the energy storage battery is greater than a first preset threshold, the startup mode is switched to backup mode. The first preset threshold is the first lower limit value of the energy storage battery.

3. The method according to claim 2, characterized in that, Controlling the first or second electrically operated circuit breaker to close or open, so that the dual power supply switching module performs a switching action in photovoltaic energy storage mode, including: In response to the connection of the power grid and the photovoltaic power generation module, power is supplied to the target load through the energy storage battery and the photovoltaic power generation module; During the process of the energy storage battery and photovoltaic power generation module supplying power to the target load, the action of monitoring the current remaining power of the energy storage battery is initiated; Based on the change in the current remaining power of the energy storage battery, the first and / or the second electrically operated circuit breaker are controlled to close or open, so that the dual power supply switching module performs a switching action in photovoltaic energy storage mode.

4. The method according to claim 3, characterized in that, Based on the change in the current remaining charge of the energy storage battery, the first and / or the second electrically operated circuit breaker are controlled to close or open, so that the dual power supply switching module performs a switching action in photovoltaic energy storage mode, including: When the current remaining power of the energy storage battery reaches a second preset threshold, the first and second electrically operated circuit breakers are controlled to open, and power is supplied to the target load through the energy storage battery; the second preset threshold is the upper limit of the energy storage battery. When the current remaining power of the energy storage battery drops from the second preset threshold to the third preset threshold, the second electrically operated circuit breaker is controlled to close. When the power of the photovoltaic power generation module is greater than the power of the target load, the photovoltaic power is transmitted to the target load through the photovoltaic power generation module, and after the photovoltaic power generation module distributes the photovoltaic power to the target load, the remaining photovoltaic power is used to power the energy storage battery. When the electrical energy of the photovoltaic power generation module is less than or equal to the electrical energy of the target load, the target load is powered by the energy storage battery and the photovoltaic power generation module together.

5. The method according to claim 4, characterized in that, Based on the change in the current remaining charge of the energy storage battery, the first and / or the second electrically operated circuit breaker is controlled to close or open, so that the dual power supply switching module performs a switching action in photovoltaic energy storage mode, and further includes: When the current remaining power of the energy storage battery drops from the third preset threshold to the first preset threshold, the first electrically operated circuit breaker is controlled to close, and the target load is supplied with mains power through the power grid, while waiting for the photovoltaic power generation module to transmit photovoltaic power to the energy storage battery; When the current remaining power of the energy storage battery drops from the first preset threshold to the fourth preset threshold, and the photovoltaic power generation module has not yet transmitted photovoltaic power to the energy storage battery, the energy storage control module automatically shuts down; the fourth preset threshold is the second lower limit value of the energy storage battery. When the monitoring time reaches the preset time point, the energy storage control module automatically turns on; When the remaining power of the energy storage battery drops from the fourth preset threshold to the fifth preset threshold, and the photovoltaic power generation module still fails to transmit photovoltaic power to the energy storage battery, the staff is prompted to repair the photovoltaic power generation module. The fifth preset threshold is the third lower limit value of the energy storage battery.

6. The method according to claim 2, characterized in that, Based on the current remaining charge of the energy storage battery or the monitoring time, the second electrically operated circuit breaker is controlled to close or open, so that the dual power supply switching module performs a switching action in standby mode, including: In response to the connection of the power grid and the photovoltaic power generation module, power is supplied to the target load through the energy storage battery and the photovoltaic power generation module; During the process of the energy storage battery and the photovoltaic power generation module supplying power to the target load, the current remaining power of the energy storage battery is monitored. Based on the change in the current remaining power of the energy storage battery or the monitoring time, the second electrically operated circuit breaker is controlled to close or open, so that the dual power supply switching module performs a switching action in the backup power mode.

7. The method according to claim 6, characterized in that, Based on the current remaining charge of the energy storage battery or the monitoring time, the second electrically operated circuit breaker is controlled to close or open, so that the dual power supply switching module performs a switching action in standby mode, including: When the current remaining power of the energy storage battery reaches a first preset threshold, the second electrically operated circuit breaker is controlled to open, and power is supplied to the target load through the energy storage battery; When the current remaining power of the energy storage battery drops from the first preset threshold to the third preset threshold, the second electrically operated circuit breaker is controlled to close, and power is supplied to the target load through the power grid; When the monitoring time falls within a preset time period, power is supplied to the target load through the power grid, and the energy storage battery serves as a backup battery.

8. The method according to claim 7, characterized in that, Based on the current remaining charge of the energy storage battery or the monitoring time, the second electrically operated circuit breaker is controlled to close or open, so that the dual power supply switching module performs a switching action in standby power mode, and the system further includes: When the current remaining power of the energy storage battery drops from the third preset threshold to the first preset threshold, the target load is supplied with power through the power grid, and the photovoltaic power generation module is waiting to transmit photovoltaic power to the energy storage battery. When the remaining power of the energy storage battery drops from the first preset threshold to the fourth preset threshold, and the photovoltaic power generation module has not yet transmitted photovoltaic power to the energy storage battery, the energy storage control module automatically shuts down; the fourth preset threshold is the second lower limit value of the energy storage battery. When the monitoring time reaches the preset time point, the energy storage control module automatically shuts down; When the remaining power of the energy storage battery drops from the fourth preset threshold to the fifth preset threshold, the staff is prompted to inspect the photovoltaic power generation module.

9. The method according to claim 5, characterized in that, The method further includes: In startup mode, when the current remaining power of the energy storage battery is less than the fifth preset threshold and the power grid is not connected, the operator is prompted to disconnect the target load.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to execute the control method of the photovoltaic energy storage system according to any one of claims 2 to 9.

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