Optical storage system

Abstract

The invention provides an optical storage system, which relates to the technical field of photovoltaic energy storage and comprises a power conversion module, a power grid access module, a power supply switching module, an energy storage module and a load module. The power conversion module is used for converting electric energy generated by light energy into a form suitable for power grid access and controlling the power supply switching module to perform grid-connected and off-grid switching; the power supply switching module is respectively connected with the power conversion module, the power grid access module and the load module, and the power supply switching module is used for receiving a command of the power conversion module so as to control the electric energy accessed to the load module. The power conversion module controls the power supply switching module to perform grid-connected and off-grid switching according to the state of the power grid, so that the effect of grid connection but no grid feeding of the optical storage system is realized, the problem of long time consumption of a procedure of accessing a photovoltaic project into the power grid is avoided, and the stability of the power grid is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic energy storage technology, and in particular to a photovoltaic energy storage system. Background Art

[0002] Photovoltaic storage system usually refers to solar photovoltaic energy storage power generation system, which is mainly composed of photovoltaic modules and battery packs. Photovoltaic modules use solar cells to directly convert sunlight radiation energy into electrical energy, while battery packs are responsible for storing this electrical energy for use when sunlight is not needed.

[0003] However, it currently takes a long time for photovoltaic storage projects to be connected to the power grid on site, resulting in low power generation efficiency and affecting the stability of the power grid. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the first objective of the present application is to propose a solar storage system.

[0006] The second objective of the present application is to provide an electronic device.

[0007] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a solar storage system, including:

[0008] Power conversion module, grid access module, power switching module, energy storage module, load module;

[0009] The power conversion module is used to convert the electric energy generated by light energy into a form suitable for grid access, and control the power switching module to switch between grid and off-grid;

[0010] The grid access module is connected to the grid and is used to input the electric energy in the grid into the power switching module;

[0011] The power switching module is connected to the power conversion module, the grid access module and the load module respectively, and the power switching module is used to receive commands from the power conversion module to control the power accessed to the load module;

[0012] The energy storage module is connected to the load module and is used to store electric energy.

[0013] Optionally, the power switching module includes: an energy metering module, a switching switch, a first bypass switch, a second bypass switch, and a plurality of load switches;

[0014] The first end of the electric energy metering module is connected to the grid access module, and the second end of the electric energy metering module is connected to the first node;

[0015] The first end of the switch is connected to the first node, and the second end of the switch is connected to the second node;

[0016] The second node is connected to the power conversion module;

[0017] The first end of the first bypass switch is connected to the first node, and the second end is connected to the third node; the first end of the second bypass switch is connected to the second node, and the second end is connected to the third node;

[0018] The first bypass switch and the second bypass switch are interlocked and connected;

[0019] The first end of the load switch is connected to the third node, and the second end is connected to the load module.

[0020] Optionally, the electric energy metering module is used to detect the state of the power grid and transmit it to the power conversion module, and the power conversion module is used to generate a control signal according to the state of the power grid to control on-grid and off-grid switching.

[0021] Optionally, when the state of the power grid is normal, the power conversion module controls the switch in the power switching module to close, so that the power conversion module is connected to the grid;

[0022] The power conversion module operates in a power quality PQ mode to control the output active power and reactive power according to a set target value.

[0023] Optionally, when the state of the power grid is abnormal, the power conversion module controls the switch in the power switching module to be disconnected, so that the power conversion module is off the grid;

[0024] The power conversion module operates in a voltage-frequency VF mode, and controls the amplitude and frequency of the output voltage according to a set target value.

[0025] Optionally, when the power conversion module is abnormal or the switching switch is abnormal, the bypass switch is used to close so that the power grid supplies power to the load module.

[0026] Optionally, the energy storage module includes: a battery cell, a battery module composed of the battery cell module, a battery pack formed by stacking multiple battery modules, a battery management unit, a battery control unit, and a power regulation unit;

[0027] Each of the battery modules includes the battery management unit, which is used to detect the operating parameters of the battery module and upload them to the battery control unit;

[0028] The battery control unit is used to receive the operating parameters of each of the battery management units;

[0029] The battery control unit is used to upload the operating parameters to the power regulation unit, and the power regulation unit is used to adjust the operating state of the energy storage module according to the operating parameters; the power regulation unit is also used to upload the operating parameters to the power conversion module.

[0030] To achieve the above-mentioned purpose, a second aspect of the present application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0031] The memory stores computer-executable instructions;

[0032] The processor executes the computer-executable instructions stored in the memory to implement the system as described in any one of the first aspects.

[0033] The photovoltaic storage system method, device, electronic device and storage medium provided in the present application control the power switching module to switch between the grid and the off-grid according to the grid status through the power conversion module, thereby achieving the effect of the photovoltaic storage system being connected to the grid but not feeding the grid, avoiding the problem of time-consuming procedures for photovoltaic projects to connect to the grid, and improving the stability of the grid.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0036] Figure 1 A schematic diagram of the structure of a photovoltaic storage system provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the electrical structure of a photovoltaic storage system provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of the structure of an energy storage module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0040] Photovoltaic storage system usually refers to solar photovoltaic energy storage power generation system, which is mainly composed of photovoltaic modules and battery packs. Photovoltaic modules use solar cells to directly convert sunlight radiation energy into electrical energy, while battery packs are responsible for storing this electrical energy for use when sunlight is not needed.

[0041] Off-grid output capability or backup power capability is an important function of photovoltaic energy storage systems. This is especially true when the public grid power supply is unstable or important household loads require uninterrupted power supply. In this case, the energy storage inverter should have off-grid output capability and the ability to automatically switch from the grid-connected state to the off-grid output state. There are two types of on-grid and off-grid switching: seamless switching and seamless switching.

[0042] Seamless switching: high-power solid-state switches (with on and off times no greater than 10ms) are needed to compensate for the slow opening and closing of mechanical circuit breakers;

[0043] Slit switching: using circuit breakers or relays with mechanical contacts for switching, the action time is relatively long, and there is a short period of power outage during the process of switching from grid-connected to off-grid.

[0044] Currently, it takes a long time for photovoltaic storage projects to be connected to the power grid on site, resulting in low power generation efficiency and affecting the stability of the power grid.

[0045] To address this problem, the present application provides a photovoltaic storage system. Figure 1 This is a schematic diagram of the structure of a photovoltaic storage system provided in an embodiment of the present application. Figure 1 As shown, the system includes: a power conversion module 10, a grid access module 20, a power switching module 30, an energy storage module 40, and a load module 50;

[0046] The power conversion module 10 is used to convert the electric energy generated by light energy into a form suitable for grid access, and control the power switching module 30 to switch between grid and off-grid;

[0047] The grid access module is connected to the grid and is used to input the electric energy in the grid into the power switching module 30;

[0048] The power switching module 30 is connected to the power conversion module 10, the grid access module 20 and the load module 50 respectively, and the power switching module 30 is used to receive the command of the power conversion module 10 to control the power accessed to the load module 50;

[0049] The energy storage module 40 is connected to the load module 50 and is used to store electric energy.

[0050] In this embodiment, the power conversion module 10 (Power Conversion System, PCS) is a key component in the grid-connected system, which is responsible for converting the electric energy generated by renewable energy (such as solar energy, wind energy, etc.) into a form suitable for grid access. PCS is usually used in energy storage systems (Energy Storage Systems, ESS) to connect battery energy storage devices with the grid to achieve two-way conversion and management of electric energy.

[0051] Main functions of PCS 1. Power conversion: · AC / DC conversion: Convert the direct current (DC) stored in the battery into alternating current (AC) for compatibility with the power grid. · DC / AC conversion: In charging mode, convert the AC power provided by the power grid into DC power suitable for battery storage. 2. Power control: · Power regulation: According to the needs of the power grid and the status of the battery, adjust the charging and discharging power to ensure that the battery operates within a safe range. · Peak shaving: During the peak period of the power grid, the energy stored in the battery is released through PCS to reduce dependence on the power grid. 3. Energy management: · Optimized scheduling: According to factors such as electricity prices, power grid conditions and user needs, intelligent scheduling of battery charging and discharging is carried out to maximize economic benefits. · Load balancing: During peak power consumption periods, the stored energy is released through PCS to balance the load of the power grid. 4. Protection functions: · Overload protection: When the PCS detects an overload condition, it automatically cuts off the circuit to protect the equipment from damage. · Fault isolation: When a fault is detected, the PCS can quickly isolate the problem area to ensure the safe operation of the system. 5. Communication and monitoring: · Data collection: Real-time monitoring of battery status, grid parameters and other information to provide decision-making basis for operation and maintenance personnel. · Remote control: Through the communication interface, remote monitoring and control are realized to improve management efficiency.

[0052] Application scenarios of PCS 1. Distributed power generation system: In distributed power generation systems such as solar photovoltaic power stations and wind power stations, PCS is used to convert intermittent renewable energy into stable electric energy and transmit it to users through the power grid. 2. Microgrid system: In the microgrid, PCS coordinates the energy flow between the energy storage system and the renewable energy generation device to ensure the self-sufficiency and stability of the microgrid. 3. Peak-shaving and valley-filling of the power grid: Through PCS, the energy storage system can charge during the valley period and discharge during the peak period to help the power grid smoothly transition load changes. 4. Backup power supply: In an emergency, PCS can quickly switch to the backup power supply mode to provide uninterrupted power supply. Conclusion PCS plays a vital role in the grid-connected energy storage system. It not only realizes the effective conversion and management of electric energy, but also improves the flexibility and reliability of the power grid. Through the reasonable design and application of PCS, the advantages of the energy storage system can be fully utilized to promote the large-scale application and development of renewable energy.

[0053] Figure 2A schematic diagram of the electrical structure of a photovoltaic storage system provided in an embodiment of the present application; Figure 2 As shown, the power conversion module 10 is used to convert the electric energy generated by light energy into a form suitable for grid access, and control the power switching module 30 to switch between grid and off-grid;

[0054] The grid access module is connected to the grid and is used to input the electric energy in the grid into the power switching module 30;

[0055] The power switching module 30 is connected to the power conversion module 10, the grid access module 20 and the load module 50 respectively, and the power switching module 30 is used to receive the command of the power conversion module 10 to control the power accessed to the load module 50;

[0056] The energy storage module 40 is connected to the load module 50 and is used to store electric energy.

[0057] Optionally, the power switching module 30 includes: an energy metering module 31, a switching switch 32, a first bypass switch 33, a second bypass switch 34, and a plurality of load switches 35;

[0058] The first end of the electric energy metering module is connected to the grid access module 20, and the second end of the electric energy metering module is connected to the first node;

[0059] The first end of the switch is connected to the first node, and the second end of the switch is connected to the second node;

[0060] The second node is connected to the power conversion module 10;

[0061] The first end of the first bypass switch is connected to the first node, and the second end is connected to the third node; the first end of the second bypass switch is connected to the second node, and the second end is connected to the third node;

[0062] The first bypass switch and the second bypass switch are interlocked and connected;

[0063] The first end of the load switch is connected to the third node, and the second end is connected to the load module 50 .

[0064] Optionally, the electric energy metering module is used to detect the state of the power grid and transmit it to the power conversion module 10, and the power conversion module 10 is used to generate a control signal according to the state of the power grid to control on-grid and off-grid switching.

[0065] In the power conversion system (PCS), PQ mode and VF mode are two different working modes, which are suitable for different application scenarios and control requirements. PQ mode: · Suitable for scenarios where the power grid is connected to the main grid, especially when the power factor requirements of the grid need to be met. · Suitable for distributed power generation systems, such as photovoltaic power stations and wind farms, where the output power needs to be controlled to match the grid requirements. · VF mode: · Suitable for island operation or microgrid environment, especially when voltage and frequency stability need to be maintained independently.

[0066] Optionally, when the state of the power grid is normal, the power conversion module 10 controls the switch in the power switching module 30 to close, so that the power conversion module 10 is connected to the grid;

[0067] The power conversion module 10 operates in a power quality PQ mode to control the output active power and reactive power according to a set target value.

[0068] In this embodiment, the PQ mode (Power-Quality Mode) PQ mode is a control mode based on active power (P) and reactive power (Q). In this mode, the PCS will control the output active power and reactive power according to the set target value to meet the power factor and power quality requirements of the access equipment of the power grid. Main features: 1. Independent control: In PQ mode, the PCS can independently control the active power (P) and reactive power (Q). The user can set the target values ​​of P and Q respectively, and the PCS will strive to maintain a stable output of these two values. 2. Applicable to distributed power generation: This mode is very suitable for distributed power generation systems (such as solar photovoltaic systems and wind power generation systems), because in these systems, it is often necessary to control the output power to match the needs of the power grid. 3. Improve power quality: By adjusting the reactive power (Q), the PCS can improve the power factor of the power grid, reduce reactive losses, and improve power quality. 4. High flexibility: Users can flexibly adjust the values ​​of P and Q according to actual conditions to adapt to different operating conditions.

[0069] Optionally, when the state of the power grid is abnormal, the power conversion module 10 controls the switch in the power switching module 30 to be disconnected, so that the power conversion module 10 is off the grid;

[0070] The power conversion module 10 operates in a voltage-frequency VF mode, and controls the amplitude and frequency of the output voltage according to a set target value.

[0071] In this embodiment, the VF mode (Voltage-Frequency Mode) VF mode is a control mode based on voltage (V) and frequency (f). In this mode, the PCS will control the amplitude and frequency of the output voltage according to the set target value to ensure the quality of the output power. Main features: 1. Voltage and frequency control: · In VF mode, the PCS mainly focuses on the amplitude and frequency of the output voltage. · The user can set the target voltage and frequency values, and the PCS will strive to maintain the stability of the output voltage and frequency. 2. Applicable to island operation: · This mode is particularly suitable for island operation or microgrid environments, because in these scenarios, the PCS needs to independently maintain the stability of voltage and frequency to ensure the normal operation of the system. 3. Improve system stability: · By controlling voltage and frequency, the PCS can improve the stability of the system, especially when the power grid is unstable or there is no power grid. 4. Applicable to small grids: · In small grids or distributed energy systems, the VF mode can help maintain the voltage and frequency of the grid and ensure the quality of power supply.

[0072] The PQ mode and the VF mode each have their own emphasis, and the choice of which mode depends on the specific application scenario and control requirements. This embodiment flexibly switches the working mode according to different operating conditions to achieve the best performance and effect.

[0073] Optionally, when the power conversion module 10 is abnormal or the switching switch is abnormal, the bypass switch is used to close so that the power grid supplies power to the load module 50 .

[0074] Figure 3 This is a schematic diagram of the structure of an energy storage module provided in an embodiment of the present application. Figure 3 As shown, the energy storage module 40 includes: a battery cell, a battery module composed of the battery cell module, a battery pack formed by stacking multiple battery modules, a battery management unit, a battery control unit, and a power regulation unit;

[0075] Each of the battery modules includes the battery management unit, which is used to detect the operating parameters of the battery module and upload them to the battery control unit;

[0076] The battery control unit is used to receive the operating parameters of each of the battery management units;

[0077] The battery control unit is used to upload the operating parameters to the power regulating unit, and the power regulating unit is used to adjust the operating state of the energy storage module 40 according to the operating parameters; the power regulating unit is also used to upload the operating parameters to the power conversion module 10.

[0078] In this embodiment, in a battery management system (BMS), a battery management unit (BMU) and a battery control unit (BCU) are two important components.

[0079] BMU usually refers to the single battery monitoring unit in the battery management system, which is mainly used to monitor and manage the status of a single battery cell. BMU is usually installed inside the battery module and is responsible for the following functions: 1. Battery cell monitoring: · Voltage monitoring: Measure the voltage of a single battery cell to ensure that the voltage is within a safe range. · Temperature monitoring: Monitor the temperature of a single battery cell to prevent overheating or low temperature. · Current monitoring: Measure the charge and discharge current of a single battery cell to determine the charge and discharge status of the battery. 2. Balancing management: · BMU is responsible for the balancing management between battery cells, balancing the state of charge (SOC) of each battery cell through active or passive balancing technology to prevent some battery cells from being overcharged or over-discharged. 3. Data communication: · BMU transmits the monitored data to the upper-level BCU or other management systems through a communication interface (such as CAN bus) for further analysis and control.

[0080] BCU is the central control unit in the battery management system, responsible for the comprehensive management and control of the entire battery system. BCU is usually located in the central position of the battery system, and its main functions include: 1. System-level monitoring and control: · Aggregate data: Collect data from multiple BMUs and conduct summary analysis to fully understand the status of the entire battery system. · Fault diagnosis: Perform fault diagnosis based on the collected data, and promptly discover and handle abnormal conditions in the battery system. 2. Strategy decision-making: · Charge and discharge strategy: According to the current status and usage requirements of the battery system, formulate a reasonable charge and discharge strategy to ensure the efficient operation of the battery system. · Protective measures: When an abnormal situation is detected, BCU can take protective measures, such as cutting off the power input or output of the battery system to prevent the accident from expanding. 3. Communication and coordination: · Communication with external systems: BCU exchanges data with the vehicle control system or other external management systems through a communication interface (such as CAN bus). · Coordinated management: Coordinate the work of each BMU to ensure the coordinated work of the entire battery system. 4. User interface: · BCU is also responsible for transmitting the status information of the battery system to the vehicle dashboard or other user interface, so that the driver or operator can understand the operating status of the battery system in real time.

[0081] Relationship between BMU and BCU BMU and BCU cooperate with each other in the battery management system to ensure the safe and efficient operation of the battery system. BMU focuses on the monitoring and management of individual battery cells, while BCU is responsible for the comprehensive management and control of the entire battery system. Through data communication between BMU and BCU, comprehensive monitoring and intelligent management of the battery system can be achieved. BMU (Battery Management Unit): Responsible for the monitoring and balancing management of individual battery cells. BCU (Battery Control Unit): Responsible for the comprehensive management and control of the entire battery system. The two work together to ensure the safe, efficient and reliable operation of the battery system. In actual applications, the specific implementation of BMU and BCU may vary due to different battery management system designs, but their basic functions and roles are roughly the same.

[0082] In the power system, the Power Conditioning Unit (PCU) is a key component, which is mainly used to convert power from one form to another and ensure the quality and reliability of power. PCU plays an important role in different power systems. The following is a detailed introduction to its functions and application scenarios: Functions of PCU 1. Power conversion: · AC / DC conversion: Converts alternating current (AC) to direct current (DC), which is often used to charge battery energy storage systems. · DC / AC conversion: Converts direct current to alternating current, which is used to feed the power of the energy storage system to the grid or for local loads. 2. Power regulation: · Voltage and current control: Regulate the output voltage and current to ensure the stability and reliability of power supply. · Frequency regulation: When the grid frequency fluctuates, the output frequency is adjusted to stabilize the grid. 3. Power quality improvement: · Filtering: Eliminate harmonic interference in the grid and improve power quality. · Power factor correction: Improve the overall power factor of the system by compensating for reactive power. 4. Protection function: · Overload protection: Automatically cut off the power supply when an overload condition is detected to prevent equipment damage. ·Short circuit protection: When a short circuit is detected, the circuit is quickly cut off to avoid the expansion of the accident. 5. Energy management: ·Load balancing: Distribute the load among multiple power sources to ensure the efficient use of energy. ·Energy storage management: Optimize the charging and discharging process of the energy storage unit through communication with the battery management system (BMS).

[0083] Application scenarios of PCU 1. Renewable energy generation system: In renewable energy generation systems such as solar photovoltaic power stations and wind power stations, PCU is responsible for converting intermittent renewable energy into stable electric energy and transmitting it to users through the power grid. 2. Energy storage system: In the battery energy storage system (ESS), PCU is used to connect the energy storage unit with the power grid to achieve two-way conversion and management of electric energy. 3. Microgrid system: In the microgrid, PCU coordinates the energy flow between the energy storage system and the renewable energy generation device to ensure the self-sufficiency and stability of the microgrid. 4. Power peak-shaving and valley-filling: Through PCU, the energy storage system can charge during the valley period and discharge during the peak period to help the power grid smoothly transition load changes. 5. Uninterruptible power supply (UPS): In the UPS system, PCU ensures that when the city power is interrupted, it can seamlessly switch to the backup power supply to provide uninterrupted power supply. In summary, the role of PCU in the power system is mainly to ensure the efficiency and reliability of power conversion, regulation and management. It achieves this goal through a series of functions such as power conversion, power regulation, power quality improvement, protection functions and energy management. PCU has a wide range of applications, from renewable energy generation to energy storage systems, microgrids to uninterruptible power supplies, all of which are important areas where it plays a role. Through the reasonable design and use of PCU, the flexibility, reliability and economy of the power system can be greatly improved.

[0084] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the system provided by the above embodiments.

[0085] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the system provided by the above embodiments.

[0086] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the system provided by the above embodiments when executed by a processor.

[0087] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0088] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0089] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0090] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0092] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0093] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0094] 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-mentioned 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 by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0095] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0096] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0097] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A solar energy storage system, characterized in that: include: Power conversion module, grid access module, power switching module, energy storage module, load module; The power conversion module is used to convert the electric energy generated by light energy into a form suitable for grid access, and control the power switching module to switch between grid and off-grid; The grid access module is connected to the grid and is used to input the electric energy in the grid into the power switching module; The power switching module is connected to the power conversion module, the grid access module and the load module respectively, and the power switching module is used to receive commands from the power conversion module to control the power accessed to the load module; The energy storage module is connected to the load module and is used to store electric energy.

2. The system according to claim 1, characterized in that The power switching module includes: an electric energy metering module, a switching switch, a first bypass switch, a second bypass switch, and a plurality of load switches; The first end of the electric energy metering module is connected to the grid access module, and the second end of the electric energy metering module is connected to the first node; The first end of the switch is connected to the first node, and the second end of the switch is connected to the second node; The second node is connected to the power conversion module; The first end of the first bypass switch is connected to the first node, and the second end is connected to the third node; the first end of the second bypass switch is connected to the second node, and the second end is connected to the third node; The first bypass switch and the second bypass switch are interlocked and connected; The first end of the load switch is connected to the third node, and the second end is connected to the load module.

3. The system according to claim 2, characterized in that The electric energy metering module is used to detect the state of the power grid and transmit the state to the power conversion module, and the power conversion module is used to generate a control signal according to the state of the power grid to control the switching between on-grid and off-grid.

4. The system according to claim 3, characterized in that When the state of the power grid is normal, the power conversion module controls the switch in the power switching module to close, so that the power conversion module is connected to the grid; The power conversion module operates in a power quality PQ mode to control the output active power and reactive power according to a set target value.

5. The system according to claim 3, characterized in that When the state of the power grid is abnormal, the power conversion module controls the switch in the power switching module to disconnect, so that the power conversion module is off the grid; The power conversion module operates in a voltage-frequency VF mode, and controls the amplitude and frequency of the output voltage according to a set target value.

6. The system according to claim 3, characterized in that When the power conversion module is abnormal or the switching switch is abnormal, the bypass switch is used to close so that the power grid can supply power to the load module.

7. The system according to claim 1, characterized in that The energy storage module includes: a battery cell, a battery module composed of the battery cell module, a battery pack formed by stacking multiple battery modules, a battery management unit, a battery control unit, and a power regulation unit; Each of the battery modules includes the battery management unit, which is used to detect the operating parameters of the battery module and upload them to the battery control unit; The battery control unit is used to receive the operating parameters of each of the battery management units; The battery control unit is used to upload the operating parameters to the power regulation unit, and the power regulation unit is used to adjust the operating state of the energy storage module according to the operating parameters; the power regulation unit is also used to upload the operating parameters to the power conversion module.

8. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the system according to any one of claims 1 to 7.

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