Optical storage charging detection system for AC / DC power taking

Abstract

The utility model provides an AC / DC power-taking optical storage charging detection system. The system comprises a three-power-supply conversion board, a plurality of battery clusters, a plurality of DC / DC cabinets, a photovoltaic assembly and an energy storage converter. The three-power-supply conversion board comprises a first alternating current power taking port, a first direct current power taking port, a second direct current power taking port and a first direct current output port; the plurality of battery clusters, the plurality of DC / DC cabinets, the photovoltaic module and the direct current end of the energy storage converter are connected in parallel on a direct current bus and are connected with the first direct current power taking port; the alternating current end of the energy storage converter is connected with an external alternating current power grid and the first alternating current power taking port; the photovoltaic module is also directly connected with the second direct current electricity taking port; and the first direct current output port is connected with an electric load. According to the utility model, the problem that the system cannot operate normally and stably due to insufficient UPS configuration power or insufficient standby power duration can be effectively improved, and the problem of application environment temperature control requirements caused by the use of the UPS can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of a photovoltaic storage charging and testing system, in particular to a photovoltaic storage charging and testing system for taking AC and DC power. Background Art

[0002] With the continuous promotion of electric vehicles, the construction of charging stations has also expanded rapidly, and energy storage systems with photovoltaic storage, charging and inspection functions have also been widely used.

[0003] The solar-storage charging and inspection systems used in traditional charging stations mostly adopt AC power supply solutions. When the external AC power grid is abnormal, the charging station will stop charging the electric vehicle and urgently cut off the auxiliary power supply, which has a certain impact and hazard on both the charging equipment and the electric vehicle.

[0004] In order to deal with the above problems, a new type of photovoltaic storage charging and inspection system has emerged. It configures an uninterruptible power supply UPS to deal with the system self-starting in the case of abnormal off-grid external AC power grid, and uses its own photovoltaic storage and charging equipment to maintain the normal operation of the system. However, as the scale of the station expands, the number of devices that need to be powered is gradually increasing, and the power of the UPS also needs to be gradually increased, otherwise it will not be able to meet the operation of all the equipment in the station; at the same time, the solution of adding UPS is more unfriendly to areas with weak or even no power grid. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to provide a photovoltaic storage charging and testing system for AC and DC power supply, which can effectively improve the problem that the system cannot operate normally and stably due to insufficient UPS configuration power or insufficient backup power time, and can avoid the problem of environmental temperature control requirements caused by the use of UPS.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A photovoltaic storage charging and testing system for AC and DC power extraction, including three power conversion boards, multiple battery clusters, multiple DC / DC cabinets, photovoltaic modules and energy storage converters;

[0008] The three-power conversion board includes a first AC power port, a first DC power port, a second DC power port and a first DC output port;

[0009] The plurality of battery clusters, the plurality of DC / DC cabinets, the photovoltaic modules and the DC end of the energy storage converter are connected in parallel to a DC bus and connected to the first DC power port;

[0010] The AC end of the energy storage converter is connected to the external AC power grid and the first AC power port;

[0011] The photovoltaic module is also directly connected to the second DC power intake port;

[0012] The first DC output port is connected to an electrical load.

[0013] Furthermore, each of the battery clusters includes a plurality of battery cells, a high voltage relay and a DC micro-breaker;

[0014] After the multiple battery cells are connected in series to form the battery cluster, the discharge terminals are connected to the DC bus, and the charging terminals are connected to the first DC output port;

[0015] The high-voltage relay is connected in series between the discharge terminal and the DC bus.

[0016] Furthermore, each of the battery clusters also includes an anti-reverse diode;

[0017] The positive terminal of the anti-reverse diode is connected between the high-voltage relay and the DC bus, and the negative terminal of the anti-reverse diode is connected to the first DC power port;

[0018] The negative terminal of the anti-reverse diode is also connected to the discharge terminal through the DC micro-breaker switch.

[0019] Furthermore, the electrical load includes an energy management subsystem EMS, a battery management subsystem BMS, a display screen, a first switch, an IO module and other low-voltage electrical equipment;

[0020] The energy management subsystem EMS, the battery management subsystem BMS, the display screen, the first switch, the IO module and the other low-voltage electrical equipment are all connected in parallel to the first DC output port.

[0021] Furthermore, each of the DC / DC cabinets is connected in parallel with a plurality of split piles, and each of the split piles is connected to a charging pile for charging an electric vehicle.

[0022] Further, each of the DC / DC cabinets includes a first three-power sub-conversion board, a first control board, a first low-voltage relay, a second switch and a first IO sub-module;

[0023] The first three power sub-conversion board includes a second AC power port, a third DC power port, a fourth DC power port and a second DC output port;

[0024] The second AC power port is connected to an external AC power grid;

[0025] The third DC power port is connected to the DC bus;

[0026] The fourth DC power port is connected to the photovoltaic module;

[0027] The second DC output port is connected to the first control board, the first low-voltage relay, the second switch and the first IO sub-module.

[0028] Furthermore, each of the split piles includes a second three-power sub-conversion board, a second control board, a second low-voltage relay, a second IO sub-module and a camera;

[0029] The second and third power sub-conversion boards include a third AC power port, a fifth DC power port, a sixth DC power port and a third DC output port;

[0030] The third AC power port is connected to the external AC power grid;

[0031] The fifth DC power port is connected to the output end of the DC / DC cabinet;

[0032] The sixth DC power port is connected to the photovoltaic module;

[0033] The third DC output port is connected to the second control board, the second low-voltage relay, the first IO submodule and the camera.

[0034] Furthermore, the input voltages of the first AC power port, the second AC power port and the third AC power port are all preset first AC voltage values;

[0035] The input voltages of the first DC power port, the second DC power port, the third DC power port, the fourth DC power port, the fifth DC power port and the sixth DC power port are all preset first DC voltage values;

[0036] The output voltages of the first DC output port, the second DC output port and the third DC output port are all preset second DC voltage values.

[0037] Furthermore, the photovoltaic assembly is connected to the DC bus through a photovoltaic controller.

[0038] The beneficial effects of the utility model are as follows: providing a photovoltaic storage charging and testing system with AC and DC power supply, adding DC power supply on the basis of the original AC power supply, replacing the UPS uninterruptible power supply through a three-power conversion board, and adding an AC power supply port on the three-power conversion board to connect to the external AC power grid, and two DC power supply ports are respectively connected to the DC bus after the energy storage converter, each DC / DC cabinet and each battery cluster are connected in parallel in the photovoltaic storage charging and testing system, and connected to the photovoltaic module, and a DC output port is provided for supplying power to the load that needs electricity; when the external AC power grid is normal, the AC power of the external AC power grid is normally used to invert into DC power through the energy storage converter and then supplied to the DC / DC cabinet, photovoltaic module and battery cluster for normal operation through the DC bus, and at the same time the three-power conversion board is used to connect to the external AC power grid, and the two DC power supply ports are respectively connected to the DC bus after the energy storage converter and each battery cluster are connected in parallel in the photovoltaic storage charging and testing system, and the photovoltaic module is connected, and a DC output port is provided for supplying power to the load that needs electricity; when the external AC power grid is normal, the AC power of the external AC power grid is normally used to convert into DC power through the energy storage converter and then supplied to the DC / DC cabinet, photovoltaic module and battery cluster for normal operation through the DC bus, and at the same time The switch board is also powered directly by the first AC power port from the external AC power grid, and the output DC power is converted and only the first DC output port is used to supply power to the power load; when the external AC power grid is abnormal, the power stored in the battery cluster, the power stored in the DC / DC cabinet, and the power generated by photovoltaic power generation of the photovoltaic module can all be provided to the DC bus. At this time, the three-power conversion board can draw power from the DC bus through the first DC power port or directly from the photovoltaic module through the second DC power port, and convert the output DC power to only the first DC output port to supply power to the power load, thereby realizing off-grid operation, effectively improving the problem of insufficient UPS configuration power or insufficient backup power time causing the system to fail to operate normally and stably, and avoiding the problem of temperature control requirements for the operating environment caused by the use of UPS. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a circuit schematic diagram of a photovoltaic storage, charging and testing system for AC and DC power extraction according to an embodiment of the utility model;

[0040] Figure 2 This is a circuit schematic diagram of a battery cluster in an AC / DC power supply photovoltaic storage, charging and testing system according to an embodiment of the utility model;

[0041] Figure 3 This is a circuit schematic diagram of a DC / DC cabinet in a photovoltaic storage charging and testing system for AC / DC power extraction according to an embodiment of the utility model;

[0042] Figure 4 This is a circuit schematic diagram of a split pile in a photovoltaic storage, charging and testing system for AC and DC power extraction according to an embodiment of the utility model.

[0043] Description of labels:

[0044] 10. Three power conversion board; 11. First AC power port; 12. First DC power port; 13. Second DC power port; 14. First DC output port;

[0045] 20. First three-power sub-conversion board; 21. Second AC power port; 22. Third DC power port; 23. Fourth DC power port; 24. Second DC output port;

[0046] 30. Second and third power sub-conversion board; 31. Third AC power port; 32. Fifth DC power port; 33. Sixth DC power port; 34. Third DC output port;

[0047] PCS, energy storage inverter; EMS, energy management subsystem; BMS, battery management subsystem. DETAILED DESCRIPTION

[0048] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0049] Please refer to Figures 1 to 4 , a photovoltaic storage charging and testing system for AC and DC power supply, including three power conversion boards, multiple battery clusters, multiple DC / DC cabinets, photovoltaic modules and energy storage converters;

[0050] The three-power conversion board includes a first AC power port, a first DC power port, a second DC power port and a first DC output port;

[0051] The plurality of battery clusters, the plurality of DC / DC cabinets, the photovoltaic modules and the DC end of the energy storage converter are connected in parallel to a DC bus and connected to the first DC power port;

[0052] The AC end of the energy storage converter is connected to the external AC power grid and the first AC power port;

[0053] The photovoltaic module is also directly connected to the second DC power intake port;

[0054] The first DC output port is connected to an electrical load.

[0055] From the above description, it can be seen that the beneficial effects of the utility model are: providing a photovoltaic storage charging and inspection system with AC and DC power supply, adding DC power supply on the basis of the original AC power supply, replacing the UPS uninterruptible power supply through a three-power conversion board, and adding an AC power supply port on the three-power conversion board to connect to the external AC power grid, and two DC power supply ports are respectively connected to the energy storage converter, each DC / DC cabinet and each battery cluster in the photovoltaic storage charging and inspection system. The DC bus is connected in parallel and connected to the photovoltaic module, and a DC output port is provided for powering the load that needs electricity; when the external AC power grid is normal, the AC power of the external AC power grid is normally used. After being inverted into DC power by the energy storage converter, it is supplied to the DC / DC cabinet, photovoltaic module and battery cluster through the DC bus for normal operation, and at the same time The three power conversion boards are also powered directly by the first AC power intake port from the external AC power grid, and convert the output DC power to supply power to the power load only at the first DC output port; when the external AC power grid is abnormal, the power stored in the battery cluster, the power stored in the DC / DC cabinet, and the power generated by photovoltaic power generation of the photovoltaic module can all be provided to the DC bus. At this time, the three power conversion boards can draw power from the DC bus through the first DC power intake port or directly from the photovoltaic module through the second DC power intake port, and convert the output DC power to supply power to the power load only at the first DC output port, thereby realizing off-grid operation, effectively improving the problem of insufficient UPS configuration power or insufficient backup power time causing the system to fail to operate normally and stably, and avoiding the problem of temperature control requirements for the operating environment caused by the use of UPS.

[0056] Furthermore, each of the battery clusters includes a plurality of battery cells, a high voltage relay and a DC micro-breaker;

[0057] After the multiple battery cells are connected in series to form the battery cluster, the discharge terminals are connected to the DC bus, and the charging terminals are connected to the first DC output port;

[0058] The high-voltage relay is connected in series between the discharge terminal and the DC bus.

[0059] From the above description, it can be seen that each battery cluster is designed with an internal DC power circuit, that is, the discharge terminal is led from the battery cell side after the battery cells are connected in series to the DC bus. When there is no AC power in the external AC power grid, the DC micro-breaker of the battery cluster can be directly closed, and the battery cells inside the battery cluster can be discharged directly to the three-power conversion board. The three-power conversion board converts the output voltage into a normal operation output voltage for the power load, and the system continues to operate stably off the grid; in addition, the charging terminal of the battery cluster is led from the telecommunications side to the first DC output port of the three-power conversion board, and when the battery cluster is low on power, it can be charged and stored through the AC power or other DC power methods of the three-power conversion board to ensure the continuity of system operation.

[0060] Furthermore, each of the battery clusters also includes an anti-reverse diode;

[0061] The positive terminal of the anti-reverse diode is connected between the high-voltage relay and the DC bus, and the negative terminal of the anti-reverse diode is connected to the first DC power port;

[0062] The negative terminal of the anti-reverse diode is also connected to the discharge terminal through the DC micro-breaker switch.

[0063] From the above description, it can be seen that the anti-reverse diode can ensure that the battery cluster and the DC bus supply power to the three power conversion boards and prevent the voltage obtained by the three power conversion boards from the DC power of the photovoltaic modules from flowing back to the battery cluster and causing a short circuit, thereby ensuring system safety.

[0064] Furthermore, the electrical load includes an energy management subsystem EMS, a battery management subsystem BMS, a display screen, a first switch, an IO module and other low-voltage electrical equipment;

[0065] The energy management subsystem EMS, the battery management subsystem BMS, the display screen, the first switch, the IO module and the other low-voltage electrical equipment are all connected in parallel to the first DC output port.

[0066] From the above description, it can be seen that whether it is AC power or DC power, it is converted into output voltage through the three-power conversion board to power various major equipment and power loads, so as to achieve continuous and stable operation of the system. The energy storage inverter has a dual power supply module function inside, which switches to off-grid mode under timing control when the external AC power grid is abnormal, outputs a stable AC voltage source, and provides AC auxiliary source for the system.

[0067] Furthermore, each of the DC / DC cabinets is connected in parallel with a plurality of split piles, and each of the split piles is connected to a charging pile for charging an electric vehicle.

[0068] Further, each of the DC / DC cabinets includes a first three-power sub-conversion board, a first control board, a first low-voltage relay, a second switch and a first IO sub-module;

[0069] The first three power sub-conversion board includes a second AC power port, a third DC power port, a fourth DC power port and a second DC output port;

[0070] The second AC power port is connected to an external AC power grid;

[0071] The third DC power port is connected to the DC bus;

[0072] The fourth DC power port is connected to the photovoltaic module;

[0073] The second DC output port is connected to the first control board, the first low-voltage relay, the second switch and the first IO sub-module.

[0074] From the above description, it can be seen that the DC / DC cabinet also adopts two power supply methods, AC and DC. By adding the first and third power sub-conversion boards, AC power is taken from the external AC power grid, and DC power is taken from the DC bus and photovoltaic modules. As long as the battery cluster is high voltage or the photovoltaic modules can generate electricity, the DC / DC cabinet can draw power from the DC bus to power its own control system and achieve stable operation.

[0075] Furthermore, each of the split piles includes a second three-power sub-conversion board, a second control board, a second low-voltage relay, a second IO sub-module and a camera;

[0076] The second and third power sub-conversion boards include a third AC power port, a fifth DC power port, a sixth DC power port and a third DC output port;

[0077] The third AC power port is connected to the external AC power grid;

[0078] The fifth DC power port is connected to the output end of the DC / DC cabinet;

[0079] The sixth DC power port is connected to the photovoltaic module;

[0080] The third DC output port is connected to the second control board, the second low-voltage relay, the first IO submodule and the camera.

[0081] From the above description, it can be seen that each split pile in the DC / DC cabinet also adopts both AC and DC power supply methods. By adding the second and third power sub-conversion boards, AC power is also taken from the external AC power grid, and DC power is taken from the output side of the DC / DC cabinet and the photovoltaic components. When the external AC power grid is abnormal or the PCS is off-grid and cuts off the external AC power grid, the AC power supply circuit of the split pile is also cut off. However, if the charging pile is charging the charging car at this time, as long as the DC / DC cabinet works normally in the DC power supply mode, the output end of the DC / DC cabinet and the main circuit of the split pile have DC power. At this time, the second and third power sub-conversion boards inside the split pile can still work normally, and the split pile continues to charge the electric car through the charging pile; at the same time, the split pile that has not started charging will lose power and cannot work because there is no DC voltage at the output end of the DC / DC cabinet, but the second and third power sub-conversion boards have added a third photovoltaic component to take power. As long as the photovoltaic component can generate electricity during the day, the split pile can also start and operate normally.

[0082] Furthermore, the input voltages of the first AC power port, the second AC power port and the third AC power port are all 230Vac;

[0083] The input voltages of the first DC power port, the second DC power port, the third DC power port, the fourth DC power port, the fifth DC power port and the sixth DC power port are all preset first DC voltage values;

[0084] The output voltages of the first DC output port, the second DC output port and the third DC output port are all preset second DC voltage values.

[0085] From the above description, it can be seen that the AC power port is connected to the external AC power grid, so the input voltage is the voltage provided by the external power grid; the DC power port voltage is within the preset first DC voltage value range, which meets the rated voltage requirements of most energy storage devices, and the DC output port provides 24V DC voltage, which meets the working voltage requirements of most power loads and control devices in the energy storage system.

[0086] Furthermore, the photovoltaic assembly is connected to the DC bus through a photovoltaic controller.

[0087] From the above description, it can be seen that the photovoltaic module can not only be used to directly supply power to the three-power conversion board, but also can be used to supply power to the three-power conversion board after merging with the voltage provided by the DC / DC cabinet and the battery cluster in the form of a DC bus through the photovoltaic controller, thereby improving the service life of the system.

[0088] The utility model provides a photovoltaic storage charging and testing system for AC and DC power supply, which is mainly used in various electric vehicle charging station scenarios. The following is a specific description in conjunction with specific embodiments:

[0089] Please refer to Figure 1 , Embodiment 1 of the present utility model is:

[0090] A photovoltaic storage charging and testing system for AC and DC power supply, such as Figure 1 As shown, it includes three power conversion boards 10, multiple battery clusters, multiple DC / DC cabinets, photovoltaic components and energy storage converter PCS.

[0091] Among them, the three-power conversion board 10 includes a first AC power port 11, a first DC power port 12, a second DC power port 13 and a first DC output port 14; the DC ends of multiple battery clusters, multiple DC / DC cabinets, photovoltaic components and energy storage inverter PCS are connected in parallel on a DC bus and connected to the first DC power port 12; the AC end of the energy storage inverter PCS is connected to the external AC power grid and the first AC power port 11; at the same time, the photovoltaic component is also directly connected to the second DC power port 13, and the first DC output port 14 is connected to the power load, which is used to convert the voltage obtained by AC power or DC power and output it to the power load for power supply.

[0092] That is, in this embodiment, DC power is added on the basis of the original AC power, and the original pure AC / UPS power supply mode is replaced by the three-power conversion board 10, and an AC power port is added on the three-power conversion board 10 to connect to the external AC power grid for AC power from the external AC power grid, and two DC power ports are respectively connected to the energy storage converter PCS in the photovoltaic storage charging and testing system, the DC bus after each DC / DC cabinet and each battery cluster are connected in parallel, and connected to the photovoltaic module to obtain DC power from the DC bus and the photovoltaic module, and a DC output port is provided for powering the load that needs electricity; when the external AC power grid is normal, the AC power of the external AC power grid is normally used to be inverted into DC power by the energy storage converter PCS and then supplied to the DC / DC cabinet, the photovoltaic module and the battery cluster for normal operation through the DC bus, and at the same time, the three-power conversion board 10 also directly uses the first AC power port 11 to take power from the external AC power grid to supply The three-power conversion board 10 can take power from the DC bus through the first DC power port 12 or directly take power from the photovoltaic component through the second DC power port 13, and convert the output DC power to only the first DC output port 14 to supply power to the system power load, and continuously charge the electric vehicle, realize on-grid and off-grid operation and senseless switching, ensure the stability and continuity of electric vehicle charging, effectively improve the problem that the system cannot operate normally and stably due to insufficient UPS configuration power or insufficient backup time, realize ultra-long system backup, and avoid the problem of temperature control requirements of the operating environment caused by the use of UPS, and reduce the cost of working temperature control caused by UPS.

[0093] The electrical load includes the energy management subsystem EMS, the battery management subsystem BMS, the display screen, the first switch, the IO module and other low-voltage electrical equipment. In other equivalent embodiments, the electrical load may not be limited to the above-mentioned equipment. The energy management subsystem EMS, the battery management subsystem BMS, the display screen, the first switch, the IO module and other low-voltage electrical equipment are all connected in parallel to the first DC output port 14.

[0094] That is, whether it is AC power or DC power, it is converted into output voltage through the three-power conversion board 10 to power various major devices and power loads, so as to achieve continuous and stable operation of the system. The energy storage inverter PCS has a dual power supply module function inside, which switches to off-grid mode under timing control when the external AC power grid is abnormal, outputs a stable AC voltage source, and provides AC auxiliary source for the system.

[0095] In addition, in this embodiment, Figure 1As shown, the photovoltaic components are connected to the DC bus through the photovoltaic controller, that is, the photovoltaic components can not only be used to directly supply power to the three power conversion boards 10, but also can be used to supply power to the three power conversion boards 10 after merging with the voltage provided by the DC / DC cabinet and the battery cluster in the form of a DC bus through the photovoltaic controller, thereby improving the service life of the system.

[0096] Please refer to Figure 2 , Embodiment 2 of the present utility model is:

[0097] A photovoltaic storage charging and testing system for AC and DC power supply, based on the above-mentioned embodiment 1, in this embodiment, as Figure 2 As shown, each battery cluster includes multiple battery cells, high-voltage relays, anti-reverse diodes and DC micro-breakers, wherein the multiple battery cells are connected in series to form a battery cluster, and the discharge terminals are connected to the DC bus, while the charging terminals are connected to the first DC output port 14.

[0098] At the same time, the high-voltage relay is connected in series between the discharge terminal and the DC bus, the positive end of the anti-reverse diode is connected between the high-voltage relay and the DC bus, the negative end of the anti-reverse diode is connected to the first DC power port 12, and the negative end of the anti-reverse diode is also connected to the discharge terminal through a DC micro-breaker switch.

[0099] That is, in this embodiment, an internal DC power supply circuit is designed inside each battery cluster, that is, a discharge terminal is led from the battery cell side after the battery cells are connected in series to the DC busbar. When there is no AC power in the external AC power grid, the battery cells inside the battery cluster can be directly discharged to the three-power conversion board 10 by directly closing the DC micro-breaker of the battery cluster. The three-power conversion board 10 converts the output voltage for the normal operation of the power load, and the system continues to operate stably off the grid; the anti-reverse diode can ensure that the battery cluster and the DC busbar supply power to the three-power conversion board 10 and prevent the voltage obtained by the three-power conversion board 10 from the photovoltaic module from flowing back to the battery cluster and causing a short circuit, thereby ensuring the safety of the system; in addition, the charging terminal of the battery cluster is led from the telecommunications side to the first DC output port 14 of the three-power conversion board 10, and when the battery cluster is insufficient, the AC power or other DC power supply methods of the three-power conversion board 10 can be used to charge and store electricity, thereby ensuring the continuity of the system operation.

[0100] Please refer to Figure 1 and Figure 3 , Embodiment 3 of the present utility model is:

[0101] A photovoltaic storage charging and testing system for AC and DC power extraction, based on the above-mentioned embodiment 1 or embodiment 2, in this embodiment, as Figure 1 As shown, each DC / DC cabinet is connected in parallel with a plurality of split piles, and each split pile is connected to a charging pile for charging an electric vehicle.

[0102] At the same time Figure 3 As shown, each DC / DC cabinet includes a first three-power sub-conversion board 20, a first control board, a first low-voltage relay, a second switch and a first IO sub-module, and the first three-power sub-conversion board 20 includes a second AC power port 21, a third DC power port 22, a fourth DC power port 23 and a second DC output port 24.

[0103] Among them, the second AC power port 21 is connected to the external AC power grid, the third DC power port 22 is connected to the DC bus, the fourth DC power port 23 is connected to the photovoltaic module, and the second DC output port 24 is connected to the first control board, the first low-voltage relay, the second switch and the first IO sub-module.

[0104] That is, in this embodiment, the DC / DC cabinet also adopts two power supply methods, AC and DC. By adding the first three-power sub-conversion board 20, AC power is taken from the external AC power grid, and DC power is taken from the DC bus and photovoltaic modules. As long as the battery cluster is high voltage or the photovoltaic module can generate electricity, the DC / DC cabinet can draw power from the DC bus to power its own control system, thereby achieving stable operation.

[0105] Please refer to Figure 4 , the fourth embodiment of the utility model is:

[0106] A photovoltaic storage, charging and inspection system with AC and DC power supply. Based on the above-mentioned embodiment three, in this embodiment, each split pile includes a second three-power sub-conversion board 30, a second control board, a second low-voltage relay, a second IO sub-module and a camera, and the second three-power sub-conversion board 30 includes a third AC power port 31, a fifth DC power port 32, a sixth DC power port 33 and a third DC output port 34.

[0107] Among them, the third AC power port 31 is connected to the external AC power grid, the fifth DC power port 32 is connected to the output end of the DC / DC cabinet, the sixth DC power port 33 is connected to the photovoltaic component, and the third DC output port 34 is connected to the second control board, the second low-voltage relay, the first IO sub-module and the camera.

[0108] That is, in the present embodiment, each split pile in the DC / DC cabinet also adopts both AC and DC power supply modes. By adding the second and third power sub-conversion boards 30, AC power is also taken from the external AC power grid, and DC power is taken from the output side of the DC / DC cabinet and the photovoltaic components. When the external AC power grid is abnormal or the PCS is off-grid and cuts off the external AC power grid, the AC power supply circuit of the split pile is also cut off. However, if the charging pile is charging the charging car at this time, as long as the DC / DC cabinet works normally in the DC power supply mode, the output end of the DC / DC cabinet and the main circuit of the split pile have DC power. At this time, the second and third power sub-conversion boards 30 inside the split pile can still work normally, and the split pile continues to charge the electric car through the charging pile. At the same time, the split pile that has not started charging will lose power and cannot work because there is no DC voltage at the output end of the DC / DC cabinet, but the second and third power sub-conversion boards 30 add a third photovoltaic component power supply. As long as the photovoltaic component can generate electricity during the day, the split pile can also start and operate normally.

[0109] In addition, in the present embodiment, the input voltages of the first AC power port 11, the second AC power port 21 and the third AC power port 31 are all preset first AC voltage values ​​of 230Vac; the input voltages of the first DC power port 12, the second DC power port 13, the third DC power port 22, the fourth DC power port 23, the fifth DC power port 32 and the sixth DC power port 33 are all preset first DC voltage values ​​of 0 to 1500Vdc; the output voltages of the first DC output port 14, the second DC output port 24 and the third DC output port 34 are all preset second DC voltage values ​​of 24Vdc.

[0110] That is, the AC power port is connected to the external AC power grid, so the input voltage is the voltage provided by the external power grid; the DC power port voltage is within the preset first DC voltage value range, which meets the rated voltage requirements of most energy storage devices, and the DC output port provides 24V DC voltage, which meets the working voltage requirements of most power loads and control devices in the energy storage system. It is worth noting that the above input voltage and output voltage can be set according to the actual situation on site, and are not limited to the above limit values.

[0111] The design of this embodiment can cancel the UPS configured in the system, and at the same time realize that the system can still operate stably when the external power grid is abnormal, and the charging pile does not stop charging the electric vehicle. It can also realize that the system can be started at any time for off-grid operation when there is no external power grid.

[0112] In summary, the utility model provides an AC / DC power supply photovoltaic storage charging and testing system, which has the following features:

[0113] Beneficial effects:

[0114] 1. Effectively replace UPS and save costs;

[0115] 2. Reduce the cost of operating temperature control caused by UPS;

[0116] 3. Realize ultra-long system backup power supply;

[0117] 4. Seamless on-grid and off-grid switching ensures the stability and continuity of electric vehicle charging.

[0118] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A photovoltaic storage, charging and testing system for AC and DC power extraction, characterized in that: It includes three power conversion boards, multiple battery clusters, multiple DC / DC cabinets, photovoltaic modules and energy storage converters; The three-power conversion board includes a first AC power port, a first DC power port, a second DC power port and a first DC output port; The plurality of battery clusters, the plurality of DC / DC cabinets, the photovoltaic modules and the DC end of the energy storage converter are connected in parallel to a DC bus and connected to the first DC power port; The AC end of the energy storage converter is connected to the external AC power grid and the first AC power port; The photovoltaic module is also directly connected to the second DC power intake port; The first DC output port is connected to an electrical load.

2. The AC / DC power supply photovoltaic storage, charging and testing system according to claim 1, characterized in that: Each of the battery clusters includes a plurality of battery cells, a high voltage relay and a DC micro-breaker; After the multiple battery cells are connected in series to form the battery cluster, the discharge terminals are connected to the DC bus, and the charging terminals are connected to the first DC output port; The high-voltage relay is connected in series between the discharge terminal and the DC bus.

3. The AC / DC power supply photovoltaic storage, charging and testing system according to claim 2, characterized in that: Each of the battery clusters also includes an anti-reverse diode; The positive terminal of the anti-reverse diode is connected between the high-voltage relay and the DC bus, and the negative terminal of the anti-reverse diode is connected to the first DC power port; The negative terminal of the anti-reverse diode is also connected to the discharge terminal through the DC micro-breaker switch.

4. The AC / DC power supply photovoltaic storage, charging and testing system according to claim 1, characterized in that: The electrical loads include an energy management subsystem EMS, a battery management subsystem BMS, a display screen, a first switch, an IO module and other low-voltage electrical equipment; The energy management subsystem EMS, the battery management subsystem BMS, the display screen, the first switch, the IO module and the other low-voltage electrical equipment are all connected in parallel to the first DC output port.

5. The AC / DC power supply photovoltaic storage, charging and testing system according to claim 1, characterized in that: Each of the DC / DC cabinets is connected in parallel with a plurality of split piles, and each of the split piles is connected to a charging pile for charging an electric vehicle.

6. The AC / DC power supply photovoltaic storage, charging and testing system according to claim 5, characterized in that: Each of the DC / DC cabinets includes a first three-power sub-conversion board, a first control board, a first low-voltage relay, a second switch and a first IO sub-module; The first three power sub-conversion board includes a second AC power port, a third DC power port, a fourth DC power port and a second DC output port; The second AC power port is connected to an external AC power grid; The third DC power port is connected to the DC bus; The fourth DC power port is connected to the photovoltaic module; The second DC output port is connected to the first control board, the first low-voltage relay, the second switch and the first IO sub-module.

7. The AC / DC power supply photovoltaic storage, charging and testing system according to claim 6, characterized in that: Each of the split piles includes a second three-power sub-conversion board, a second control board, a second low-voltage relay, a second IO sub-module and a camera; The second and third power sub-conversion boards include a third AC power port, a fifth DC power port, a sixth DC power port and a third DC output port; The third AC power port is connected to the external AC power grid; The fifth DC power port is connected to the output end of the DC / DC cabinet; The sixth DC power port is connected to the photovoltaic module; The third DC output port is connected to the second control board, the second low-voltage relay, the first IO submodule and the camera.

8. The AC / DC power supply optical storage, charging and testing system according to claim 7, characterized in that: The input voltages of the first AC power port, the second AC power port and the third AC power port are all preset first AC voltage values; The input voltages of the first DC power port, the second DC power port, the third DC power port, the fourth DC power port, the fifth DC power port and the sixth DC power port are all preset first DC voltage values; The output voltages of the first DC output port, the second DC output port and the third DC output port are all preset second DC voltage values.

9. The AC / DC power supply photovoltaic storage, charging and testing system according to claim 1, characterized in that: The photovoltaic assembly is connected to the DC bus through a photovoltaic controller.

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