A photovoltaic energy storage integrated charging pile electric energy supply device
The photovoltaic energy storage integrated charging pile power supply device solves the problem of traditional charging piles' dependence on the municipal power grid, realizes multi-source energy coordinated scheduling and mode switching, and improves the power supply reliability and economic benefits of charging piles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANDONG TIANRUN NEW ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2026-03-27
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional charging pile systems rely on the municipal power grid and lack the ability to actively utilize renewable and clean energy, resulting in a significant increase in grid load during peak electricity consumption periods, making it difficult to balance the needs of clean energy consumption and grid peak shaving and valley filling.
The charging pile power supply device adopts photovoltaic energy storage integration. Through the DC bus integrated architecture, it combines photovoltaic DC conversion unit, energy storage battery pack, bidirectional DC conversion unit and energy management system to realize multi-source energy coordinated scheduling and mode switching, and supports seamless switching between grid-connected and off-grid modes.
This significantly increases the self-consumption rate of photovoltaic power generation, improves the reliability of charging power supply and its adaptability to all scenarios, reduces operating costs, and achieves efficient utilization and economic benefits of clean energy.
Smart Images
Figure CN122267705A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of new energy charging equipment technology, and in particular to a photovoltaic energy storage integrated charging pile power supply device. Background Technology
[0002] With the explosive growth of the global new energy vehicle industry, the demand for intelligent, efficient, and integrated development of charging piles, as the core infrastructure for electric vehicle energy replenishment, is becoming increasingly urgent. Traditional charging pile systems are highly dependent on the municipal power grid, lacking the ability to actively utilize renewable and clean energy, and significantly increasing the grid load during peak electricity consumption periods. This makes it difficult to simultaneously meet the dual needs of clean energy consumption and grid peak shaving and valley filling. Therefore, photovoltaic energy storage integrated charging piles have become an important direction for industry upgrading.
[0003] Based on the shortcomings and deficiencies of the existing technologies, developing a photovoltaic energy storage integrated charging pile power supply device with short energy conversion links, high integration, flexible expansion capabilities, multi-mode intelligent scheduling, and full-link security management has become a key technical problem that urgently needs to be solved by those skilled in the art, and is also a core requirement to promote the development of the charging pile industry towards high efficiency, intelligence, and greenness. Summary of the Invention
[0004] This invention relates to a photovoltaic energy storage integrated charging pile power supply device to solve the technical problems of traditional photovoltaic charging piles, such as large energy conversion loss, low photovoltaic self-use rate, poor power supply reliability, and insufficient coordination of multi-source energy dispatch.
[0005] In a first aspect, this invention provides a photovoltaic-energy storage integrated charging pile power supply device, specifically comprising: a charging pile body and a photovoltaic energy storage module. The photovoltaic energy storage module includes a photovoltaic array, a photovoltaic DC-DC converter unit, an energy storage battery pack, a battery management system, an energy storage bidirectional DC-DC converter unit, a bidirectional energy storage inverter, a DC bus, and an energy management system. The output terminal of the photovoltaic array is electrically connected to the input terminal of the photovoltaic DC-DC converter unit, and the output terminal of the photovoltaic DC-DC converter unit is connected to the DC bus. The positive and negative terminals of the energy storage battery pack are electrically connected to the low-voltage side of the energy storage bidirectional DC-DC converter unit, and the high-voltage side of the energy storage bidirectional DC-DC converter unit is connected to the DC bus. The battery management system is connected to the energy storage battery pack and the energy storage bidirectional DC-DC converter unit. The bidirectional energy storage converter has a bidirectional communication connection; the DC side of the bidirectional energy storage converter is connected to the DC bus, and the AC side of the bidirectional energy storage converter is used to connect to the municipal power grid; the charging pile body includes at least one charging power conversion unit, a charging interface, and a control motherboard. The input terminal of the charging power conversion unit is connected to the DC bus, and the output terminal of the charging power conversion unit is electrically connected to the charging interface. The control motherboard has a bidirectional communication connection with the charging power conversion unit and the charging interface; the energy management system has a bidirectional communication connection with the photovoltaic DC conversion unit, the bidirectional energy storage DC conversion unit, the bidirectional energy storage converter, the battery management system, and the control motherboard, respectively, for performing multi-source energy collaborative scheduling and intelligent switching of working modes.
[0006] Furthermore, the photovoltaic DC-DC converter unit adopts a multi-channel independent maximum power point tracking topology. Each conversion channel corresponds to an independent photovoltaic array, and each channel independently performs maximum power point tracking control with a tracking efficiency of not less than 99.5%.
[0007] Furthermore, the energy storage battery pack uses lithium iron phosphate energy storage cells and has a graded cluster modular structure; the battery management system integrates active balancing function, real-time monitoring function of battery remaining capacity and health status, and overcharge, over-discharge, over-temperature and short circuit protection function, and its active balancing current is not less than 5A.
[0008] Furthermore, the energy storage bidirectional DC-DC converter unit adopts a bidirectional buck-boost topology, supports a wide input voltage range, and is used to realize bidirectional energy flow between the energy storage battery pack and the DC bus, as well as closed-loop regulation of the charging and discharging power of the energy storage battery pack.
[0009] Furthermore, the bidirectional energy storage converter adopts a bidirectional AC / DC conversion topology, supporting seamless switching between grid-connected and off-grid modes; in grid-connected mode, it performs unity power factor control and DC bus voltage regulation control, and in off-grid mode, it outputs constant voltage and constant frequency AC power to provide voltage support for the DC bus under off-grid conditions.
[0010] Furthermore, the energy management system incorporates automatic switching logic for multiple operating modes, including grid-connected self-consumption mode, peak-valley arbitrage mode, off-grid emergency mode, and standby maintenance mode, wherein: In the grid-connected self-consumption mode, the energy management system controls the photovoltaic array to prioritize supplying the charging load of the charging pile body. The remaining energy is used to charge the energy storage battery pack through the bidirectional DC-DC converter. When the remaining capacity of the energy storage battery pack reaches the set charging limit, the remaining photovoltaic energy is fed into the municipal power grid through the bidirectional energy storage converter. Under the peak-valley arbitrage mode, the energy management system controls the municipal power grid to charge the energy storage battery pack through the bidirectional energy storage converter and the bidirectional DC-DC conversion unit during the low-price period, and controls the energy storage battery pack to discharge during the high-price period, so that it can work together with the photovoltaic array to supply power to the charging pile. In the off-grid emergency mode, when a power outage or fault is detected in the municipal power grid, the energy management system controls the bidirectional energy storage converter to switch to off-grid mode, and the photovoltaic array and energy storage battery pack provide voltage support for the DC bus and provide off-grid emergency power supply for the charging pile body. In the standby maintenance mode, when the remaining capacity of the energy storage battery pack is lower than the set discharge limit, the energy management system controls the municipal power grid to replenish the energy storage battery pack to a safe threshold, and at the same time performs a system-wide self-check and fault warning.
[0011] Furthermore, the charging power conversion unit adopts a bidirectional resonant soft-switching topology, whose input voltage range covers the operating voltage fluctuation range of the DC bus, with a peak conversion efficiency of not less than 98.5%, and supports multi-stage charging control of constant current, constant voltage, and constant power.
[0012] Furthermore, the charging pile body also integrates an energy metering unit, a human-machine interaction unit, a communication unit, and a safety protection unit; the energy metering unit is electrically connected to the DC bus, the charging power conversion unit, and the bidirectional energy storage converter, respectively, to achieve accurate metering of photovoltaic power output, grid interaction power, energy storage charging and discharging power, and charging power consumption throughout the entire chain; the human-machine interaction unit includes a touch screen display, a card swiping recognition module, and a code scanning recognition module, and is bidirectionally connected to the control motherboard.
[0013] Furthermore, the communication unit supports fourth-generation / fifth-generation mobile communication, Ethernet, and wireless LAN communication methods, used to realize data interaction between the energy management system, the control motherboard, the cloud operation platform, and the user terminal; the safety protection unit includes a leakage current protection module, an overvoltage and overcurrent protection module, a short circuit protection module, an overtemperature protection module, and a lightning strike protection module, which are electrically connected to the control motherboard.
[0014] Furthermore, the DC bus has a reserved expandable interface, which supports parallel access of multiple charging piles and capacity expansion access of new photovoltaic arrays and energy storage battery packs; the energy management system has a reserved standardized communication interface, which supports docking with virtual power plant dispatching systems and smart park energy management systems to participate in grid demand response.
[0015] This invention provides a photovoltaic energy storage integrated charging pile power supply device, which has the following beneficial effects: This invention utilizes a DC bus integration architecture that deeply integrates the charging pile body with the photovoltaic energy storage module. With a unified DC bus as the core hub for energy flow, it completely eliminates the multi-stage AC / DC conversion path of traditional split-type photovoltaic charging piles—photovoltaic-grid-inverter-municipal power grid-charging pile rectification and voltage reduction. This allows photovoltaic power to be directly supplied to the charging load via the DC conversion unit, reducing energy loss across the entire chain from the topological source, significantly improving the self-consumption rate of photovoltaic power, and maximizing the utilization value of clean energy. Simultaneously, it constructs a multi-source redundant power supply system integrating the grid, photovoltaics, and energy storage, breaking the absolute dependence of traditional charging piles on the municipal power grid and enabling grid connection and... Seamless switching to off-grid mode ensures stable power supply to charging piles even in remote areas with grid failures, power outages, or no grid coverage, significantly improving the reliability and adaptability of charging power supply across all scenarios. Furthermore, relying on a unified energy management system that communicates bidirectionally with the entire power unit and control unit, it enables integrated intelligent and coordinated scheduling of multi-source energy. This allows for flexible adaptation to dynamic changes in peak and off-peak electricity prices, photovoltaic output, grid load, and charging demand, implementing optimization strategies such as prioritizing photovoltaic self-consumption and peak-valley charging / discharging arbitrage. This significantly reduces the operating costs of charging piles throughout their entire lifecycle, substantially improving the project's economic benefits and return on investment. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.
[0017] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.
[0018] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a schematic diagram of the internal electrical connection of the photovoltaic energy storage module of the present invention; Figure 3 This is a schematic diagram of the internal electrical connection of the charging pile body of the present invention; Figure 4 This is a control logic block diagram of the system of the present invention; Figure 5This is a schematic diagram of the energy flow in the grid-connected self-generation and self-consumption mode of the present invention; Figure 6 This is a schematic diagram of the energy flow in the off-grid emergency mode of the present invention.
[0019] List of reference numerals 1. Charging pile body; 2. Photovoltaic energy storage module; 11. Charging power conversion unit; 12. Charging interface; 13. Control motherboard; 14. Energy metering unit; 15. Human-machine interaction unit; 151. Touch screen display; 152. Card swiping recognition module; 153. Code scanning recognition module; 16. Communication unit; 17. Safety protection unit; 171. Leakage protection module; 172. Overvoltage and overcurrent protection module; 173. Short circuit protection module; 174. Overtemperature protection module; 175. Lightning protection module; 21. Photovoltaic array; 22. Photovoltaic DC-DC conversion unit; 23. Energy storage battery pack; 24. Battery management system; 25. Energy storage bidirectional DC-DC conversion unit; 26. Bidirectional energy storage converter; 27. DC bus; 273. Expandable interface; 28. Energy management system. Detailed Implementation
[0020] 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, not all, of the embodiments of the present invention. Based on the described 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.
[0021] Please refer to Figures 1 to 6 Example 1: This invention proposes a photovoltaic energy storage integrated charging pile power supply device, comprising: a charging pile body 1 and a photovoltaic energy storage module 2. The photovoltaic energy storage module 2 includes a photovoltaic array 21, a photovoltaic DC-DC converter 22, an energy storage battery pack 23, a battery management system 24, an energy storage bidirectional DC-DC converter 25, a bidirectional energy storage inverter 26, a DC bus 27, and an energy management system 28. The output terminal of the photovoltaic array 21 is electrically connected to the input terminal of the photovoltaic DC-DC converter 22, and the output terminal of the photovoltaic DC-DC converter 22 is connected to the DC bus 27. The positive and negative terminals of the energy storage battery pack 23 are electrically connected to the low-voltage side of the energy storage bidirectional DC-DC converter 25, and the high-voltage side of the energy storage bidirectional DC-DC converter 25 is connected to the DC bus 27. The battery management system 24 is connected to the energy storage battery pack 23 and the energy storage bidirectional DC-DC converter 25. Unit 25 has bidirectional communication connection; the DC side of the bidirectional energy storage converter 26 is connected to the DC bus 27, and the AC side of the bidirectional energy storage converter 26 is used for electrical connection with the municipal power grid; the charging pile body 1 includes at least one charging power conversion unit 11, a charging interface 12, and a control motherboard 13. The input end of the charging power conversion unit 11 is connected to the DC bus 27, and the output end of the charging power conversion unit 11 is electrically connected to the charging interface 12. The control motherboard 13 has bidirectional communication connection with the charging power conversion unit 11 and the charging interface 12; the energy management system 28 has bidirectional communication connection with the photovoltaic DC conversion unit 22, the bidirectional energy storage DC conversion unit 25, the bidirectional energy storage converter 26, the battery management system 24, and the control motherboard 13, respectively, and is used to perform multi-source energy collaborative scheduling and intelligent switching of working modes.
[0022] In this embodiment of the invention, the photovoltaic DC-DC converter 22 adopts a multi-channel independent maximum power point tracking topology. Each conversion channel corresponds to an independent photovoltaic array 21. Each channel independently performs maximum power point tracking control, with a tracking efficiency of not less than 99.5%. Its function is to ensure that each photovoltaic array 21 can always work at its maximum power output state, unaffected by the differences in light and temperature of other photovoltaic arrays 21, maximizing the power generation potential of the photovoltaic array 21. At the same time, it stably converts the fluctuating DC voltage output by the photovoltaic array 21 into a stable DC voltage that is compatible with the DC bus 27, realizing the efficient and stable access of photovoltaic power to the DC bus 27, laying the foundation for subsequent direct supply to charging loads. Moreover, the high tracking efficiency of 99.5% can minimize the energy loss of photovoltaic power during the conversion process, further improving the utilization rate of photovoltaic energy.
[0023] In this embodiment of the invention, the energy storage battery pack 23 uses lithium iron phosphate energy storage cells and has a hierarchical cluster modular structure. The battery management system 24 integrates active balancing function, real-time monitoring function of battery remaining capacity and health status, and overcharge, over-discharge, over-temperature, and short-circuit protection function. Its active balancing current is not less than 5A. Its functions are: the use of lithium iron phosphate energy storage cells in the energy storage battery pack 23 can ensure the high safety, long cycle life, and high energy density of the energy storage system; the hierarchical cluster modular structure facilitates capacity expansion, fault diagnosis, and maintenance and replacement; the battery management system 24, through the active balancing function, avoids capacity decay and shortened lifespan caused by voltage inconsistencies among the cells inside the energy storage battery pack 23; by monitoring the remaining capacity and health status of the energy storage battery pack 23 in real time, it provides accurate data support for the charging and discharging scheduling of the energy management system 28; and through the overcharge, over-discharge, over-temperature, and short-circuit protection function, it prevents abnormal operating conditions of the energy storage battery pack 23, ensures the operational safety of the energy storage battery pack 23 and the entire system, and extends the service life of the energy storage system.
[0024] In this embodiment of the invention, the bidirectional DC-DC converter unit 25 adopts a bidirectional buck-boost topology, supporting a wide input voltage range. It is used to realize bidirectional energy flow between the energy storage battery pack 23 and the DC bus 27, as well as closed-loop regulation of the charging and discharging power of the energy storage battery pack 23. Its function is as follows: the bidirectional buck-boost topology, combined with the wide input voltage range, can adapt to voltage fluctuations during the charging and discharging process of the energy storage battery pack 23, achieving efficient bidirectional energy conversion between the energy storage battery pack 23 and the DC bus 27. When photovoltaic power is sufficient and the charging load demand is small, the remaining photovoltaic power on the DC bus 27 is converted into a voltage suitable for the energy storage battery pack 23 to charge it. When photovoltaic power is insufficient and the charging load demand is large, the power released by the energy storage battery pack 23 is converted into a voltage suitable for the DC bus 27 and fed into the DC bus 27 to supplement power supply. Simultaneously, through closed-loop regulation of the charging and discharging power, the charging and discharging speed and power of the energy storage battery pack 23 are precisely controlled, avoiding power fluctuations from affecting the voltage stability of the DC bus 27, and ensuring the coordinated and stable operation of the energy storage system and the entire power supply device.
[0025] In this embodiment of the invention, the bidirectional energy storage converter 26 adopts a bidirectional AC / DC conversion topology, supporting seamless switching between grid-connected and off-grid modes. In grid-connected mode, it performs unity power factor control and DC bus 27 voltage regulation control. In off-grid mode, it outputs constant voltage and constant frequency AC power, providing voltage support for DC bus 27 under off-grid conditions. Its function is: the bidirectional AC / DC conversion topology realizes bidirectional energy interaction between DC bus 27 and the municipal power grid; in grid-connected mode, unity power factor control ensures no reactive power loss when the bidirectional energy storage converter 26 interacts with the municipal power grid, improving grid interaction efficiency; and simultaneously, through DC bus 27 voltage regulation control, it maintains... The DC bus 27 has a stable voltage, ensuring the stable operation of all DC-side equipment such as the photovoltaic DC-DC converter unit 22, the energy storage bidirectional DC-DC converter unit 25, and the charging power conversion unit 11. In off-grid mode, it provides stable voltage support to the DC bus 27 by outputting constant voltage and constant frequency AC power, ensuring that when the municipal power grid is interrupted or fails, the power output from the photovoltaic array 21 and the energy storage battery pack 23 can be stably connected to the DC bus 27 to continuously power the charging pile body 1, realizing off-grid emergency power supply and ensuring uninterrupted charging service. The seamless switching function can ensure that there is no power interruption or voltage fluctuation when switching between grid-connected and off-grid modes, improving the power supply reliability and stability of the entire device.
[0026] In this embodiment of the invention, the energy management system 28 has built-in automatic switching logic for multiple working modes, including grid-connected self-consumption mode, peak-valley arbitrage mode, off-grid emergency mode, and standby maintenance mode, wherein: In the grid-connected self-consumption mode, the energy management system 28 controls the photovoltaic array 21 to prioritize supplying the charging load of the charging pile body 1. The remaining energy is used to charge the energy storage battery pack 23 through the energy storage bidirectional DC-DC converter unit 25. When the remaining capacity of the energy storage battery pack 23 reaches the set charging limit, the remaining photovoltaic energy is fed into the municipal power grid through the bidirectional energy storage converter 26. To maximize the self-consumption rate of photovoltaic power and reduce its waste, clean energy is prioritized for power supply to the charging pile body 1, reducing the charging pile body 1's dependence on municipal power grid and thus lowering charging operation costs. At the same time, the remaining photovoltaic power is stored in the energy storage battery pack 23 through the bidirectional DC-DC converter 25 to avoid redundant loss of photovoltaic power. When the energy storage battery pack 23 is fully charged, the excess photovoltaic power is fed into the municipal power grid through the bidirectional energy storage converter 26, realizing full utilization of photovoltaic power. This approach takes into account both the utilization of clean energy and the additional revenue obtained through grid feeding, ensuring the rationality and economy of energy flow.
[0027] Under the peak-valley arbitrage mode, the energy management system 28 controls the municipal power grid to charge the energy storage battery pack 23 through the bidirectional energy storage converter 26 and the bidirectional DC-DC conversion unit 25 during the low-price period, and controls the energy storage battery pack 23 to discharge during the high-price period, together with the photovoltaic array 21 to supply power to the charging pile body 1. By leveraging the peak-valley electricity price difference of the municipal power grid, precise control of charging operation costs and maximization of profits are achieved. During off-peak hours, low-priced grid electricity is used, and the AC grid electricity is converted into DC power through the bidirectional energy storage converter 26. Then, the bidirectional DC-DC converter unit 25 converts the DC power into a voltage suitable for the energy storage battery pack 23, charging the energy storage battery pack 23 at low cost. During peak hours, the energy storage battery pack 23 is controlled to discharge, and the DC bus 27 is connected through the bidirectional DC-DC converter unit 25. The electricity output from the photovoltaic array 21 works together to power the charging pile 1, reducing the use of high-priced grid electricity during peak hours, significantly reducing charging operation costs, and maximizing the value of the energy storage battery pack 23, thereby improving the economic practicality of the entire device.
[0028] In off-grid emergency mode, when a power outage or fault is detected in the municipal power grid, the energy management system 28 controls the bidirectional energy storage converter 26 to switch to off-grid mode, and the photovoltaic array 21 and the energy storage battery pack 23 provide voltage support for the DC bus 27 to provide off-grid emergency power supply for the charging pile body 1. To ensure the continuity and reliability of power supply to the charging pile body 1, and to avoid the interruption of charging services due to power outages or faults in the municipal power grid, the device's emergency response capability is enhanced. After the bidirectional energy storage converter 26 switches to off-grid mode, it stops energy interaction with the municipal power grid and provides stable voltage support to the DC bus 27 by outputting constant voltage and constant frequency AC power. This ensures that the electrical energy output by the photovoltaic array 21 is connected to the DC bus 27 via the photovoltaic DC-DC conversion unit 22, and the electrical energy output by the energy storage battery pack 23 is connected to the DC bus 27 via the energy storage bidirectional DC-DC conversion unit 25. The two work together to power the charging pile body 1, meet emergency charging needs, and are suitable for scenarios with unstable power grids or no power grid coverage, thus expanding the applicability of the device.
[0029] In standby maintenance mode, when the remaining capacity of the energy storage battery pack 23 is lower than the set discharge lower limit, the energy management system 28 controls the municipal power grid to replenish the energy storage battery pack 23 to the safety threshold, and at the same time performs a system-wide self-check and fault warning. To ensure the lifespan and operational safety of the energy storage battery pack 23, and to prevent cell damage and capacity decay due to over-discharge, the battery pack 23 is replenished to a safe threshold to ensure it remains in a healthy working state, providing reliable energy storage support for the normal operation of subsequent working modes. Simultaneously, through a system-wide self-test, the status of all equipment, including the photovoltaic array 21, photovoltaic DC-DC converter unit 22, bidirectional energy storage DC-DC converter unit 25, bidirectional energy storage converter 26, and charging pile body 1, is monitored. This allows for timely detection of equipment faults and the issuance of early warnings, facilitating timely troubleshooting and maintenance by staff, reducing the risk of equipment failure, extending the lifespan of the entire device, and ensuring long-term stable operation.
[0030] In this embodiment of the invention, the charging power conversion unit 11 adopts a bidirectional resonant soft-switching topology. Its input voltage range covers the operating voltage fluctuation range of the DC bus 27, and its peak conversion efficiency is not less than 98.5%. It supports multi-stage charging control of constant current, constant voltage, and constant power. Its functions are as follows: The bidirectional resonant soft-switching topology can significantly reduce the switching loss of the charging power conversion unit 11. Combined with a peak conversion efficiency of not less than 98.5%, it reduces the waste of electrical energy during the conversion process and further improves the energy utilization efficiency of the entire device. The input voltage range covers the operating voltage fluctuation range of the DC bus 27, which can ensure that the charging power conversion unit 11 can still work stably when the DC bus 27 voltage fluctuates, avoiding the impact of voltage fluctuation on the charging effect. The multi-stage charging control of constant current, constant voltage, and constant power can adapt to the charging needs of electric vehicles of different types and different power states, realize fast, safe, and efficient charging of electric vehicles, protect the electric vehicle battery, extend the service life of the electric vehicle battery, and ensure the charging adaptability and reliability of the charging pile body 1.
[0031] In Example 2, based on Example 1, the charging pile body 1 also integrates an energy metering unit 14, a human-machine interaction unit 15, a communication unit 16, and a safety protection unit 17. The energy metering unit 14 is electrically connected to the DC bus 27, the charging power conversion unit 11, and the bidirectional energy storage converter 26, respectively, to achieve accurate metering of the entire chain of photovoltaic power output, grid interaction power, energy storage charging and discharging power, and charging power consumption. The human-machine interaction unit 15 includes a touch screen 151, a card swiping recognition module 152, and a code scanning recognition module 153, and is bidirectionally connected to the control motherboard 13. The communication unit 16 supports fourth-generation / fifth-generation... Mobile communication, Ethernet, and wireless LAN communication methods are used to realize data interaction between the energy management system 28, the control motherboard 13, the cloud operation platform, and the user terminal. The safety protection unit 17 includes a leakage current protection module 171, an overvoltage and overcurrent protection module 172, a short circuit protection module 173, an overtemperature protection module 174, and a lightning protection module 175. These modules are electrically connected to the control motherboard 13. Their function is to enable the energy metering unit 14 to achieve accurate metering of energy across the entire chain. The system provides accurate data support for charging billing, photovoltaic revenue statistics, grid interaction settlement, and energy storage charging and discharging management, ensuring data traceability and verifiability, and guaranteeing the standardization and economy of operation. The human-machine interaction unit 15 provides users with convenient charging operation and information query channels through the touch screen 151, card swiping recognition module 152, and barcode scanning recognition module 153, and works with the control motherboard 13 to realize automated management and control of the charging process, improving the user experience. The communication unit 16 realizes real-time data interaction between the energy management system 28, the control motherboard 13, the cloud operation platform, and user terminals through multiple communication methods, facilitating remote monitoring by staff. The device's operating status and scheduling management also facilitate users to remotely view the charging progress and control the charging process, improving the device's intelligent operation level; the safety protection unit 17 works in concert with various protection modules, including leakage protection module 171 to prevent leakage accidents and ensure the safety of personnel and equipment, overvoltage and overcurrent protection module 172 to avoid damage to equipment due to abnormal voltage and current, short circuit protection module 173 to eliminate short circuit hazards, overtemperature protection module 174 to prevent equipment from overheating, and lightning protection module 175 to resist lightning interference, comprehensively ensuring the operational safety of the charging pile body 1, photovoltaic energy storage module 2 and the entire system, reducing the risk of equipment failure and safety accidents.
[0032] In Example 3, based on Examples 1 and 2, the DC bus 27 has a reserved expandable interface 273. This expandable interface 273 supports parallel access of multiple charging pile bodies 1, as well as capacity expansion access for newly added photovoltaic arrays 21 and energy storage battery packs 23. The energy management system 28 has a reserved standardized communication interface, supporting integration with virtual power plant dispatch systems and smart park energy management systems to participate in grid demand response. Its function is: the expandable interface 273 of the DC bus 27 can flexibly increase the number of charging pile bodies 1 according to charging demand, enabling simultaneous multi-path charging and improving the charging capacity and service capabilities of the device; it also supports the addition of photovoltaic arrays 21 and energy storage battery packs 23. The capacity expansion of pool group 23 can flexibly expand photovoltaic power generation capacity and energy storage capacity according to sunlight conditions and energy storage needs, adapting to charging operation needs of different scenarios and scales, and reducing the cost of device upgrades and renovations; the standardized communication interface reserved in the energy management system 28 enables seamless connection with the virtual power plant dispatch system and the smart park energy management system, enabling the device to participate in grid demand response, outputting power to supplement the grid during peak grid load and storing power during off-peak grid load, helping the grid to shave peaks and fill valleys, improving grid operation stability, while expanding the application scenarios of the device, enhancing the social value and market competitiveness of the device, and realizing the coordinated development of the device with the grid and smart parks.
[0033] The working principle of this invention is as follows: During operation, the DC power output from the photovoltaic array 21 is first converted and controlled by the photovoltaic DC-DC converter unit 22 for voltage conversion and maximum power point tracking, and then sent to the DC bus 27. The charging power conversion unit 11 of the charging pile body 1 directly draws power from the DC bus 27, and after voltage adaptation, charges the vehicle through the charging interface 12, realizing direct self-use of photovoltaic power to reduce energy conversion losses. When the photovoltaic output is greater than the charging demand, the energy management system 28 controls the energy storage bidirectional DC-DC converter unit 25 to store the excess power into the energy storage battery pack 2. 3. Once the energy storage battery pack 23 is fully charged, the bidirectional energy storage converter 26 is controlled to feed the remaining photovoltaic power into the municipal power grid. When the photovoltaic output is insufficient, the energy management system 28 can control the energy storage battery pack 23 to discharge to the DC bus 27 through the bidirectional DC-DC converter 25, coordinating with the photovoltaic array 21 to supply power. In peak-valley arbitrage mode, the energy management system 28 controls the municipal power grid to charge the energy storage battery pack 23 through the bidirectional energy storage converter 26 and the bidirectional DC-DC converter 25 during off-peak hours, and controls the energy storage battery pack 23 to discharge during peak hours. Electricity supplies power to the charging pile body 1. When a power outage or fault is detected in the municipal power grid, the energy management system 28 controls the bidirectional energy storage converter 26 to switch to off-grid mode. The photovoltaic array 21 and the energy storage battery pack 23 jointly provide voltage support to the DC bus 27 to maintain the emergency power supply of the charging pile body 1. When the remaining capacity of the energy storage battery pack 23 is lower than the set value, the energy management system 28 controls the municipal power grid to replenish it to a safe threshold and performs a full system self-check and fault warning. The electricity metering unit 14 performs accurate metering of photovoltaic output, grid interaction, energy storage charging and discharging, and charging power throughout the entire chain. The safety protection unit 17 works in coordination with the control motherboard 13 through various protection modules to ensure the safe and stable operation of the entire system. The energy management system 28 achieves multi-source energy optimization scheduling and intelligent switching of multiple working modes through the coordinated control of each unit. At the same time, the expandable interface 273 of the DC bus 27 supports the parallel expansion of multiple charging pile bodies 1 and the expansion of photovoltaic and energy storage capacity. The energy management system 28 participates in grid demand response through a standardized communication interface, further improving the energy utilization rate, operational reliability, and scenario adaptability of the entire device.
[0034] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.
[0035] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.
[0036] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims
1. A photovoltaic energy storage integrated charging pile power supply device, comprising: The charging pile body (1) and the photovoltaic energy storage module (2) are characterized in that the photovoltaic energy storage module (2) includes a photovoltaic array (21), a photovoltaic DC-DC converter (22), an energy storage battery pack (23), a battery management system (24), an energy storage bidirectional DC-DC converter (25), a bidirectional energy storage converter (26), a DC bus (27), and an energy management system (28); the output end of the photovoltaic array (21) is electrically connected to the input end of the photovoltaic DC-DC converter (22), and the output end of the photovoltaic DC-DC converter (22) is connected to the DC bus (27); the positive and negative terminals of the energy storage battery pack (23) are electrically connected to the low-voltage side of the energy storage bidirectional DC-DC converter (25), and the high-voltage side of the energy storage bidirectional DC-DC converter (25) is connected to the DC bus (27); the battery management system (24) is bidirectionally connected to the energy storage battery pack (23) and the energy storage bidirectional DC-DC converter (25); The DC side of the bidirectional energy storage converter (26) is connected to the DC bus (27), and the AC side of the bidirectional energy storage converter (26) is used to connect to the municipal power grid. The charging pile body (1) includes at least one charging power conversion unit (11), a charging interface (12), and a control motherboard (13). The input end of the charging power conversion unit (11) is connected to the DC bus (27), and the output end of the charging power conversion unit (11) is connected to the charging interface (12). The control motherboard (13) is bidirectionally connected to the charging power conversion unit (11) and the charging interface (12). The energy management system (28) is bidirectionally connected to the photovoltaic DC conversion unit (22), the energy storage bidirectional DC conversion unit (25), the bidirectional energy storage converter (26), the battery management system (24), and the control motherboard (13) to perform multi-source energy coordinated scheduling and intelligent switching of working modes.
2. The photovoltaic energy storage integrated charging pile power supply device according to claim 1, characterized in that, The photovoltaic DC-DC converter (22) adopts a multi-channel independent maximum power point tracking topology. Each conversion channel corresponds to a set of independent photovoltaic arrays (21), and each channel independently performs maximum power point tracking control.
3. The photovoltaic energy storage integrated charging pile power supply device according to claim 1, characterized in that, The energy storage battery pack (23) uses lithium iron phosphate energy storage cells and has a graded cluster modular structure; the battery management system (24) integrates active balancing function, real-time monitoring function of battery remaining capacity and health status, and overcharge, over-discharge, over-temperature and short circuit protection function.
4. The photovoltaic energy storage integrated charging pile power supply device according to claim 1, characterized in that, The bidirectional DC-DC converter unit (25) adopts a bidirectional buck-boost topology and supports a wide input voltage range. It is used to realize bidirectional energy flow between the energy storage battery pack (23) and the DC bus (27), as well as closed-loop regulation of the charging and discharging power of the energy storage battery pack (23).
5. The photovoltaic energy storage integrated charging pile power supply device according to claim 1, characterized in that, The bidirectional energy storage converter (26) adopts a bidirectional AC / DC conversion topology and supports seamless switching between grid-connected and off-grid modes. In grid-connected mode, it performs unity power factor control and DC bus (27) voltage regulation control. In off-grid mode, it outputs constant voltage and constant frequency AC power to provide voltage support for DC bus (27) under off-grid conditions.
6. The photovoltaic energy storage integrated charging pile power supply device according to claim 1, characterized in that, The energy management system (28) has built-in automatic switching logic for multiple working modes, including grid-connected self-consumption mode, peak-valley arbitrage mode, off-grid emergency mode and standby maintenance mode.
7. The photovoltaic energy storage integrated charging pile power supply device according to claim 1, characterized in that, The charging power conversion unit (11) adopts a bidirectional resonant soft-switching topology, and its input voltage range covers the operating voltage fluctuation range of the DC bus (27).
8. A photovoltaic energy storage integrated charging pile power supply device according to claim 6, characterized in that, The charging pile body (1) also integrates an energy metering unit (14), a human-machine interaction unit (15), a communication unit (16), and a safety protection unit (17); the energy metering unit (14) is electrically connected to the DC bus (27), the charging power conversion unit (11), and the bidirectional energy storage converter (26) respectively, and is used to realize the full-link accurate metering of photovoltaic power output, grid interaction power, energy storage charging and discharging power, and charging power consumption; the human-machine interaction unit (15) includes a touch screen (151), a card swiping recognition module (152), and a code scanning recognition module (153), and is bidirectionally connected to the control motherboard (13).
9. A photovoltaic energy storage integrated charging pile power supply device according to claim 8, characterized in that, The communication unit (16) supports fourth-generation / fifth-generation mobile communication, Ethernet, and wireless local area network communication methods, and is used to realize data interaction between the energy management system (28), the control motherboard (13), the cloud operation platform, and the user terminal; the safety protection unit (17) includes a leakage current protection module (171), an overvoltage and overcurrent protection module (172), a short circuit protection module (173), an overtemperature protection module (174), and a lightning protection module (175). The leakage current protection module (171), the overvoltage and overcurrent protection module (172), the short circuit protection module (173), the overtemperature protection module (174), and the lightning protection module (175) are electrically connected to the control motherboard (13) respectively.
10. A photovoltaic energy storage integrated charging pile power supply device according to claim 8, characterized in that, The DC bus (27) has a reserved expandable interface (273), which supports the parallel access of multiple charging pile bodies (1) and the capacity expansion access of newly added photovoltaic array (21) and energy storage battery pack (23); the energy management system (28) has a reserved standardized communication interface, which supports the connection with the virtual power plant dispatch system and the smart park energy management system to participate in grid demand response.