Grid-connected and off-grid optical storage and charging equipment

Abstract

The utility model discloses grid-connected and off-grid optical storage and charging equipment, which is used for supplying power to a load and comprises a photovoltaic module, an energy storage system, an inverter module and a control unit, solar energy is converted into direct current to be output based on the photovoltaic module; storing or releasing electric energy based on the energy storage system; one end of the inverter module is connected with the photovoltaic module and the power grid; the other end of the inverter module is connected with the energy storage system; the conversion between direct current and alternating current is realized based on the inverter module, and the inverter module maintains the maximum power output based on a maximum power point tracking algorithm; the control unit is connected with the energy storage system and receives working parameters of the energy storage system; the other end of the control unit is connected with the inverter module and the photovoltaic module, and the control unit controls the working states of the inverter module and the photovoltaic module based on the obtained working parameters of the energy storage system. By integrating photovoltaic power generation and energy storage technologies, the stability and reliability of power supply are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, particularly relates to a parallel and off-grid light storage and charging device. BACKGROUND

[0002] With the growth of demand for clean energy and the reduction of dependence on traditional energy, the "light storage and charging" system, as part of the renewable energy solution, has received widespread attention. The system mainly consists of three parts: photovoltaic power generation (photovoltaic), energy storage (battery pack) and charging (charging pile).

[0003] However, the existing light storage and charging system relies on the stability of the power grid, and cannot meet the power demand of the load when the power grid fails or there is no power supply. CONTENT OF THE INVENTION

[0004] To solve the above problems, the present application discloses a parallel and off-grid light storage and charging device, which integrates photovoltaic power generation and energy storage technology, enhances the stability and reliability of power supply.

[0005] The present application provides a parallel and off-grid light storage and charging device for supplying power to a load, which comprises:

[0006] a photovoltaic module for converting solar energy into direct current output;

[0007] an energy storage system for storing or releasing electrical energy;

[0008] an inverter module connected to the photovoltaic module and the power grid at one end, and connected to the energy storage system at the other end; the inverter module realizes the conversion between direct current and alternating current based on the maximum power point tracking algorithm to maintain maximum power output;

[0009] a control unit connected to the energy storage system, which receives the working parameters of the energy storage system; the control unit is connected to the inverter module and the photovoltaic module at the other end, and controls the working state of the inverter module and the photovoltaic module based on the working parameters of the energy storage system.

[0010] The energy storage system comprises a battery pack and a BMS, and the state of the battery pack is monitored and managed based on the BMS; the corresponding relationship between the battery pack and the BMS is one-to-one or one BMS corresponding to multiple battery packs.

[0011] The energy storage system further comprises a thermal management module and a battery aging prediction module; the BMS controls the working state of the thermal management module based on the temperature of the battery pack; the battery aging prediction module predicts the remaining life of the battery pack based on historical data and real-time monitoring.

[0012] The photovoltaic module adopts PERC or HIT technology to improve energy conversion efficiency.

[0013] The inverter module has an automatic switching function, which preferentially uses grid power supply when the grid is normal, and seamlessly switches to off-grid mode when the grid fails or has no power supply, and continues to supply power to the load.

[0014] The maximum power point tracking algorithm includes short-circuit current and open-circuit voltage method, perturbation and observation method or incremental conductance method.

[0015] The control unit includes a data acquisition module and a control logic module, and collects data of the energy storage system and the load end based on the data acquisition module and sends it to the control logic module; the control logic module adjusts the working state of the photovoltaic module, the energy storage system and the inverter module based on the received data.

[0016] The control unit further comprises a communication module, which exchanges data with a remote monitoring platform and external equipment based on the communication module.

[0017] The beneficial effects of the present application: Unlike the prior art, the present application discloses a hybrid off-grid light storage and charging device for supplying power to the load, which comprises a photovoltaic module, an energy storage system, an inverter module and a control unit; based on the photovoltaic module, solar energy is converted into direct current output; based on the energy storage system, electrical energy is stored or released; one end of the inverter module is connected with the photovoltaic module and the grid; the other end of the inverter module is connected with the energy storage system; based on the inverter module, the conversion between direct current and alternating current is realized, and the inverter module maintains maximum power output based on the maximum power point tracking algorithm; the control unit is connected with the energy storage system, and the control unit receives the working parameters of the energy storage system; the other end of the control unit is connected with the inverter module and the photovoltaic module, and the control unit controls the working state of the inverter module and the photovoltaic module based on the working parameters of the energy storage system. By integrating photovoltaic power generation and energy storage technology, the stability and reliability of power supply are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Wherein:

[0020] Figure 1 A structural schematic diagram of an embodiment of the off-grid light storage and charging device provided in the present application is shown in FIG. 1.

[0021] Figure 2 A structural schematic diagram of an embodiment of the off-grid light storage and charging device provided in the present application is shown in FIG. 1. Figure 1

[0022] A structural schematic diagram of an embodiment of the off-grid light storage and charging device provided in the present application is shown in FIG. 1. Figure 3 Figure 1 A structural schematic diagram of an embodiment of the off-grid light storage and charging device provided in the present application is shown in FIG. 1. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] The terms "first", "second", and the like in the present application are used to distinguish different objects, but not to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally includes other steps or units not listed or optionally includes other steps or units inherent to the process, method, product or device.

[0025] In this document, the term "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it independent or alternative to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0026] The present application provides an off-grid light storage and charging device for powering a load, which enhances the stability and reliability of power supply by integrating photovoltaic power generation and energy storage technology; as shown in FIG. 1, Figure 1 Figure 1 A structural schematic diagram of an embodiment of the off-grid light storage and charging device provided in the present application is shown in FIG. 1. The off-grid light storage and charging device comprises a photovoltaic module, an energy storage system, an inverter module and a control unit. ​​

[0027] Based on the photovoltaic module to convert solar energy into DC output; photovoltaic module uses solar panels to convert the received solar radiation energy into DC power, through photovoltaic power generation, users can achieve self-sufficiency in power to a certain extent, especially in remote areas or unstable power grid.

[0028] Based on the energy storage system to store or release electric energy; energy storage system can provide stable power output without sunlight, ensuring continuous power supply for the load; charging in low price period and discharging in peak period can help users save electricity bill.

[0029] The inverter module is connected to the photovoltaic module and the power grid at one end; the other end of the inverter module is connected to the energy storage system; based on the inverter module to realize the conversion between DC and AC; the inverter module is responsible for converting the DC power generated by the photovoltaic module into AC power to be compatible with the power grid and to supply AC load; at the same time, it also supports two-way power flow, allowing excess power to be fed back to the power grid when necessary; efficient power conversion reduces energy loss and improves the overall efficiency of the system.

[0030] The inverter module maintains maximum power output based on the maximum power point tracking algorithm (MPPT); the application of MPPT algorithm enables the highest output power of the photovoltaic module to be maintained under varying light conditions.

[0031] The control unit is connected to the energy storage system, and the control unit receives the working parameters of the energy storage system; the other end of the control unit is connected to the inverter module and the photovoltaic module, and the control unit controls the working state of the inverter module and the photovoltaic module based on the working parameters of the energy storage system; the control unit realizes automatic control of the entire system, improves the operation efficiency and reduces manual intervention; it can quickly respond to changes in the environment and load, dynamically adjust the system configuration and ensure optimal performance.

[0032] In summary, the off-grid and on-grid photovoltaic storage and charging device of the embodiment includes: photovoltaic module, energy storage system, inverter module and control unit; based on the photovoltaic module to convert solar energy into DC output; based on the energy storage system to store or release electric energy; one end of the inverter module is connected to the photovoltaic module and the power grid; the other end of the inverter module is connected to the energy storage system; based on the inverter module to realize the conversion between DC and AC, the inverter module maintains maximum power output based on the maximum power point tracking algorithm; the control unit is connected to the energy storage system, and the control unit receives the working parameters of the energy storage system; the other end of the control unit is connected to the inverter module and the photovoltaic module, and the control unit controls the working state of the inverter module and the photovoltaic module based on the working parameters of the energy storage system. By integrating photovoltaic power generation and energy storage technology, the stability and reliability of power supply are enhanced.

[0033] Optionally, the energy storage system includes a battery pack and a BMS (Battery Management System) that monitors and manages the state of the battery pack; the BMS collects data from the battery pack in real time and performs preliminary processing. For example, calculate the state of charge (SOC), state of health (SOH), maximum charge / discharge rate, etc.; the BMS performs charge / discharge management of the battery pack based on the collected data. For example, when the battery voltage is too high or too low, the BMS will trigger a protection mechanism to stop charging or discharging to prevent battery damage.

[0034] The correspondence between the battery pack and the BMS is one-to-one or one BMS corresponding to multiple battery packs; as Figure 2 Figure 2 The battery pack and the BMS in Figure 1 The structure diagram of an embodiment of the energy storage system, Figure 2 The battery pack and the BMS in

[0035] Each battery pack has an independent BMS for monitoring, ensuring the accuracy and real-time nature of the data. Even if a battery pack has a problem, it will not affect the normal operation of other battery packs; since the BMS and the battery pack are one-to-one, if a battery pack fails, the BMS can immediately take measures to isolate the battery pack and prevent the failure from spreading to other battery packs.

[0036] One BMS corresponding to multiple battery packs can be implemented through a daisy chain topology or a star topology, which is not limited here; the BMS uniformly schedules the charge / discharge behavior of multiple battery packs according to the load demand and grid conditions of the overall system. For example, when the grid price is low, the BMS can preferentially charge some battery packs; during peak hours, the BMS can selectively release electrical energy to optimize electricity costs; the BMS can also dynamically adjust the charge / discharge rate based on the health status of the battery pack to extend the service life of the battery pack.

[0037] Optionally, the energy storage system also includes a thermal management module (not shown in the figure) and a battery aging prediction module (not shown in the figure); the BMS controls the working state of the thermal management module based on the temperature of the battery pack; the BMS transmits the collected temperature data to the central control system or the built-in control logic module. The module analyzes whether it needs to start or adjust the working state of the thermal management module according to the preset temperature threshold (such as the maximum working temperature and the minimum working temperature); if the temperature is too high, the BMS will trigger the cooling system (such as a fan, a liquid cooling device); if the temperature is too low, the BMS will start the heating device (such as an electric heater, a heating element in the thermal management system).

[0038] ​With precise temperature control, the thermal management module can effectively prevent the battery pack from accelerating aging due to overheating or overcooling, thereby prolonging the service life of the battery; keeping the battery pack within the appropriate working temperature range can optimize its charging and discharging efficiency and improve the overall performance of the energy storage system.

[0039] The battery aging prediction module predicts the remaining life of the battery pack based on historical data and real-time monitoring; the battery aging prediction module collects historical data and real-time monitoring data of the battery pack through the BMS. These data include but are not limited to voltage, current, temperature, charging and discharging times, SOC (state of charge), SOH (state of health), etc.; the module can infer the aging degree of the battery by analyzing parameters such as the change of internal resistance and the capacity decay rate, and predict the future performance decline trend.

[0040] By identifying the signs of battery aging early, users can maintain or replace the battery at the right time to avoid premature failure due to overuse, thereby prolonging its service life; predictive maintenance can reduce unnecessary regular inspections and replacements, reducing maintenance costs; at the same time, potential problems are discovered in advance, avoiding high repair costs due to sudden failures.

[0041] Optionally, the photovoltaic module adopts PERC (Passivated Emitter and Rear Contact) or HIT (Heterojunction) technology to improve energy conversion efficiency; PERC technology significantly improves the photoelectric conversion efficiency of the battery, and the conversion efficiency of PERC battery can reach more than 22%, which is about 1-2 percentage points higher than traditional polycrystalline silicon battery; HIT battery has a very low temperature coefficient, which can maintain excellent power generation performance in high temperature environment, reducing the loss of power generation due to temperature rise.

[0042] In summary, BMS corresponds to one battery pack, which is suitable for application scenarios with extremely high safety requirements, accurate monitoring and rapid response, providing higher reliability and maintenance convenience, but the hardware cost is higher. One BMS corresponds to multiple battery packs, which is suitable for large-scale energy storage systems, which can reduce hardware costs and simplify system architecture.

[0043] Optionally, the inverter module has an automatic switching function, which preferentially uses grid power when the grid is normal, and seamlessly switches to off-grid mode when the grid fails or there is no power supply, continuing to supply power to the load; during the switching process, the inverter module quickly switches the power supply from the grid to the energy storage system and the photovoltaic module. This process is usually completed within a few milliseconds to ensure that the load does not experience any power interruption; the inverter module will adjust its output waveform to match the needs of the load, ensuring that the load device can run smoothly. For example, the inverter will generate a stable sinusoidal AC to replace the power provided by the grid.

[0044] By implementing a series of steps, including real-time monitoring of the power grid status, rapid activation of switching logic, seamless transition to off-grid mode, maintaining load power supply, and restoring grid-connected mode, the system ensures high reliability and continuity. This function not only improves the stability of power supply but also optimizes energy utilization, extends battery life, reduces operating costs, and enhances the user experience.

[0045] Optionally, maximum power point tracking algorithms include the short-circuit current and open-circuit voltage method, the perturbation and observation method, or the incremental conductance method. The implementation methods of the short-circuit current and open-circuit voltage method, the perturbation and observation method, or the incremental conductance method are common knowledge to those skilled in the art and will not be elaborated upon here. The applicable situations for these three methods are described in detail below:

[0046] The short-circuit current and open-circuit voltage method is suitable for static environments and low-cost systems. It has the advantages of being simple to implement and having good stability, but its response speed is relatively slow and its accuracy is limited.

[0047] The perturbation-observation method is widely used in various photovoltaic systems. It has a fast response speed, is simple to implement, and has a low cost. However, it may have oscillation problems near the maximum power point and is prone to getting trapped in local optima under multi-peak conditions.

[0048] Incremental conductance method: suitable for systems with high requirements for accuracy and stability, it can accurately find the maximum power point and avoid oscillation and multi-peak problems, but the calculation is complex and the hardware requirements are high.

[0049] like Figure 3 As shown, Figure 3 for Figure 1 A schematic diagram of a control unit according to an embodiment, the control unit includes a data acquisition module and a control logic module;

[0050] The data acquisition module collects data from the energy storage system and the load, and sends it to the control logic module. Various types of sensors are deployed in the energy storage system, photovoltaic modules, inverter modules, and load to monitor key parameters in real time. These sensors include, but are not limited to, voltage sensors, current sensors, and temperature sensors. Voltage sensors measure the output voltage of the battery pack, photovoltaic modules, and inverter; current sensors measure charging and discharging current, photovoltaic current, and load current; and temperature sensors monitor the temperature of the battery pack, inverter, and other critical components.

[0051] The control logic module adjusts the operating status of the photovoltaic module, energy storage system, and inverter module based on the received data. The control logic module performs real-time analysis of the collected data to calculate the current status and performance indicators of each subsystem, for example:

[0052] Calculate the maximum power point (MPP) of the photovoltaic module and adjust its operating state according to the MPPT algorithm.

[0053] The state of charge (SOC) and the state of health (SOH) of the energy storage system are evaluated to determine whether charging or discharging is needed.

[0054] The demand of the load is monitored to predict the future power consumption trend.

[0055] Through real-time data collection and analysis, the control logic module can accurately regulate the working state of each subsystem, ensuring that the photovoltaic module always works at its maximum power point, the energy storage system efficiently charges and discharges, and the inverter stably outputs power. Based on the load demand and the state of the energy storage system, the control logic module can intelligently dispatch power resources, maximize the use of renewable energy, reduce dependence on traditional power grids, and reduce electricity costs.

[0056] Optionally, the control unit further includes a communication module (not shown in the figure) for data exchange with a remote monitoring platform and external devices. Users can view the running state of the system in real time, obtain detailed running data and performance indicators through the remote monitoring platform. This allows users to understand the health status of the system at any time and take timely measures to address problems; users can send control instructions through the remote monitoring platform to adjust the running parameters of the system. For example, MPPT parameters of the photovoltaic module can be adjusted in advance according to weather forecasts, or the discharging function of the energy storage system can be started during peak hours to optimize power utilization.

[0057] By introducing the communication module, the containerized off-grid photovoltaic energy storage and charging device not only realizes intelligent management and automatic control, but also provides a transparent, convenient and efficient power solution for users, improving user experience and the overall efficiency of the system.

[0058] In several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are only illustrative, such as the division of the modules or units, which is only a logical function division, and actual implementation can have another division manner, such as combination or integration of multiple units or components, or some features can be ignored or not executed.

[0059] The units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. According to actual needs, some or all of the units can be selected to achieve the purpose of the present embodiment scheme.

[0060] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0061] The above is only the embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A grid-connected and off-grid optical storage and charging device for supplying power to a load, characterized in that, The off-grid light storage and charging device comprises: a photovoltaic module, which converts solar energy into direct current output; a storage system, which stores or releases electric energy; an inverter module, one end of which is connected with the photovoltaic module and the power grid, and the other end of which is connected with the storage system, and which realizes conversion between direct current and alternating current, and maintains maximum power output based on a maximum power point tracking algorithm; a control unit, which is connected with the storage system and receives working parameters of the storage system, and is connected with the inverter module and the photovoltaic module, and controls working states of the inverter module and the photovoltaic module based on the working parameters of the storage system.

2. The off-grid light storage and charging device according to claim 1, characterized in that, The storage system comprises a battery pack and a BMS, which monitors and manages states of the battery pack; the battery pack and the BMS are in one-to-one correspondence or one BMS corresponds to multiple battery packs.

3. The off-grid light storage and charging device of claim 2, wherein, The storage system further comprises a thermal management module and a battery aging prediction module; the BMS controls working states of the thermal management module based on temperatures of the battery pack; the battery aging prediction module predicts remaining life of the battery pack based on historical data and real-time monitoring.

4. The off-grid light storage and charging device of claim 3, wherein, The photovoltaic module adopts PERC or HIT technology to improve energy conversion efficiency.

5. The off-grid light storage and charging device of claim 4, wherein, The inverter module has an automatic switching function, which preferentially uses power grid power supply when the power grid is normal, and seamlessly switches to an off-grid mode when the power grid fails or has no power supply, and continues to supply power to the load.

6. The off-grid optical storage and charging device according to claim 5, characterized in that, The maximum power point tracking algorithm comprises a short-circuit current and open-circuit voltage method, a perturbation and observation method or an incremental conductance method.

7. The off-grid optical storage and charging device according to claim 6, characterized in that, The control unit comprises a data acquisition module and a control logic module, which collects data of the storage system and the load end and sends the data to the control logic module; the control logic module adjusts working states of the photovoltaic module, the storage system and the inverter module based on the received data.

8. The off-grid light storage and charging device of claim 7, wherein, The control unit further comprises a communication module, which exchanges data with a remote monitoring platform and external equipment.

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