A power supply system

Abstract

The application discloses a power supply system. The power supply system comprises an energy storage device, the energy storage device comprising a first inverter, a first DC bus, a first voltage conversion module and an energy storage battery connected in sequence, the first voltage conversion module being used for voltage reduction or voltage increase of DC power in the energy storage battery, a first end of the first inverter being used for electrically connecting a power grid and / or an alternating current load, and being used for inverting and converting the DC power reduced or increased in voltage in the first voltage conversion module to output to the alternating current load or the power grid; a DC charging pile comprising a second inverter, a second DC bus, a second voltage conversion module and a power supply port connected in sequence, a first end of the second inverter being used for electrically connecting the power grid; and an electric connection line, a first end of the electric connection line being used for electrically connecting the first DC bus, and a second end of the electric connection line being used for electrically connecting the second DC bus. In the above manner, hardware cost can be saved, and power energy management linkage can be realized.

Description

Technical Field

[0001] This application relates to the field of power supply system technology, and in particular to a power supply system. Background Technology

[0002] With the increasing prevalence of charging equipment (such as DC charging stations) and electric vehicles, there is a growing demand for bidirectional DC charging stations, enabling battery packs to discharge from vehicles back to homes or the power grid. DC charging stations have also evolved from unidirectional charging stations capable only of charging electric vehicles to bidirectional discharge modules. Achieving optimal power energy management and realizing low-carbon energy conversion requires further optimization. Utility Model Content

[0003] This application provides a power supply system that can save hardware costs and achieve coordinated power energy management.

[0004] This application provides a power supply system comprising: an energy storage device, the energy storage device including a first inverter, a first DC bus, a first voltage conversion module, and an energy storage battery connected in sequence; the first voltage conversion module is used to step down or step up the DC power in the energy storage battery; a first terminal of the first inverter is used to be electrically connected to the power grid and / or an AC load, and is used to invert and convert the stepped-down or stepped-up DC power in the first voltage conversion module to output to the AC load or the power grid; a DC charging pile, the DC charging pile including a second inverter, a second DC bus, a second voltage conversion module, and a power supply port connected in sequence; a first terminal of the second inverter is used to be electrically connected to the power grid; and an electrical connection line, the first terminal of the electrical connection line being used to be electrically connected to the first DC bus, and the second terminal of the electrical connection line being used to be electrically connected to the second DC bus.

[0005] The energy storage device further includes: a first voltage conversion module, the first end of which is connected to the second end of the first inverter; and an energy storage battery, which is connected to the second end of the first voltage conversion module.

[0006] The first voltage conversion module includes a first positive terminal and a first negative terminal. The first inverter includes: a first bridge arm, which includes a first power unit and a second power unit; wherein the first terminal of the first power unit is connected to the first positive terminal of the first voltage conversion module, the second terminal of the first power unit is connected to the first terminal of the second power unit, the second terminal of the second power unit is connected to the first negative terminal of the first voltage conversion module, and the connection point between the first power unit and the second power unit is connected to the first terminal of the power grid; and a second bridge arm, which includes a third power unit and a fourth power unit; wherein the first terminal of the third power unit is connected to the first positive terminal of the first voltage conversion module, the second terminal of the third power unit is connected to the first terminal of the fourth power unit, the second terminal of the fourth power unit is connected to the first negative terminal of the first voltage conversion module, and the connection point between the third power unit and the fourth power unit is connected to the second terminal of the power grid.

[0007] The first inverter further includes a third bridge arm, which includes a fifth power unit and a sixth power unit. The first end of the fifth power unit is connected to the first positive terminal of the first voltage conversion module, the second end of the fifth power unit is connected to the first end of the sixth power unit, the second end of the sixth power unit is connected to the first negative terminal of the first voltage conversion module, and the connection point between the fifth power unit and the sixth power unit is connected to the third terminal of the power grid.

[0008] The first voltage conversion module includes: a transformer module; a first-side power unit, the first end of which serves as the second end of the first voltage conversion module and is connected to the energy storage battery, and the second end of which is connected to one side of the transformer module; and a second-side power unit, the first end of which is connected to the other side of the transformer module, and the second end of which serves as the first end of the first voltage conversion module and is connected to the second end of the first inverter.

[0009] The first inverter includes a bidirectional inverter, and the second inverter includes a unidirectional DC inverter.

[0010] The first inverter includes a unidirectional DC inverter, and the second inverter includes a bidirectional DC inverter.

[0011] The first inverter includes a bidirectional inverter, and the second inverter is a bidirectional DC inverter.

[0012] The charging equipment also includes: a second voltage conversion module, the first end of which is connected to the second end of the second inverter; and a power supply port, the first end of which is connected to the second end of the second voltage conversion module, and the second end of which is used to connect to the charging equipment or the power supply equipment.

[0013] The second voltage conversion module is a bidirectional voltage conversion module.

[0014] The first voltage conversion module further includes: a voltage conversion unit, the first end of which serves as the second end of the first voltage conversion module and is connected to the energy storage battery; the second end of the voltage conversion unit is connected to the first end of the first-side power unit; the energy storage device further includes an MPPT module, the first end of which is electrically connected to the second end of the voltage conversion unit, and the second end of the MPPT module is used to connect to an external photovoltaic device for maximum power point tracking of the input power of the photovoltaic device.

[0015] The MPPT module includes either a BOOST circuit or a BUCK-BOOST circuit.

[0016] The beneficial effects of this application are as follows: Unlike existing technologies, the power supply system provided in this application includes an energy storage device, a DC charging pile, and an electrical connection line. The energy storage device includes a first inverter, a first DC bus, a first voltage conversion module, and an energy storage battery, all connected in sequence. The DC charging pile includes a second inverter, a second DC bus, a second voltage conversion module, and a power supply port, all connected in sequence. The electrical connection line interconnects the first DC bus of the energy storage device and the second DC bus of the DC charging pile. On the one hand, when the second inverter is a unidirectional inverter, the bidirectional characteristics of the first inverter are reused to realize the charging and discharging functions of the DC charging pile, eliminating the need to replace the second inverter and saving hardware costs. Furthermore, when the DC charging pile provides charging functionality, the first inverter can also provide corresponding auxiliary charging, thus improving overall charging efficiency. On the other hand, when the second inverter is a bidirectional inverter, the bidirectional characteristics of the first inverter are reused, enabling the charging and discharging functions of the DC charging pile to be realized without replacing the second inverter, saving hardware costs. Additionally, when the DC charging pile provides charging functionality, the first inverter can also provide corresponding auxiliary charging, improving overall charging efficiency. Using the bidirectional characteristics of the first inverter, when the DC charging pile provides charging function, the first inverter can also provide corresponding auxiliary charging, which can improve the overall charging efficiency. When the first inverter is a unidirectional DC inverter, the bidirectional characteristics of the second inverter are reused, and the second inverter can also provide corresponding auxiliary charging. On the other hand, in the grid-connected scenario, the first inverter and the second inverter are connected in parallel to output load, thereby improving the load capacity and achieving the purpose of capacity expansion. That is, the power supply system of this application can use electrical connection lines to interconnect the first DC bus of the energy storage device and the second DC bus of the DC charging pile to realize the linkage of power energy management. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the structure of the first embodiment of the power supply system provided in this application; Figure 2This is a schematic diagram of the structure of the second embodiment of the power supply system provided in this application; Figure 3 This is a schematic diagram of the third embodiment of the power supply system provided in this application; Figure 4 This is a schematic diagram of the structure of an embodiment of the first inverter and the first voltage conversion module provided in this application; Figure 5 This is a schematic diagram of another embodiment of the first inverter and the first voltage conversion module provided in this application; Figure 6 This is a schematic diagram of another embodiment of the first inverter and the first voltage conversion module provided in this application; Figure 7 This is a schematic diagram of another embodiment of the first inverter and the first voltage conversion module provided in this application; Figure 8 This is a schematic diagram of another embodiment of the first inverter and the first voltage conversion module provided in this application; Figure 9 This is a schematic diagram of the structure of an embodiment of the second inverter and the second voltage conversion module provided in this application; Figure 10 This is a schematic diagram of another embodiment of the second inverter and the second voltage conversion module provided in this application; Figure 11 This is a schematic diagram of another embodiment of the second inverter and the second voltage conversion module provided in this application; Figure 12 This is a schematic diagram of another embodiment of the second inverter and the second voltage conversion module provided in this application; Figure 13 This is a schematic diagram of another embodiment of the second inverter and the second voltage conversion module provided in this application; Figure 14 This is a schematic diagram of an embodiment of the energy storage device provided in this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0020] With the increasing prevalence of charging equipment (such as DC charging stations) and electric vehicles, there is a growing demand for bidirectional DC charging stations, enabling battery packs to discharge from vehicles back to homes or the power grid. DC charging stations have also evolved from unidirectional charging stations capable only of charging electric vehicles to bidirectional discharge modules. Achieving optimal power energy management and realizing low-carbon energy conversion requires further optimization.

[0021] For example, unidirectional charging devices do not support vehicle discharge to the grid, requiring hardware replacement and the development of bidirectional charging devices. Developing bidirectional charging devices and energy storage devices is completely independent, increasing hardware costs.

[0022] Based on this, this application proposes to interconnect the first DC bus of the energy storage device and the second DC bus of the DC charging pile using electrical connection lines. On the one hand, when the second inverter is a unidirectional inverter, the bidirectional characteristics of the first inverter are reused to realize the charging and discharging functions of the DC charging pile without replacing the second inverter, saving hardware costs. Furthermore, when the DC charging pile provides charging functionality, the first inverter can also provide corresponding auxiliary charging, thus improving overall charging efficiency. On the other hand, when the second inverter is a bidirectional inverter, the bidirectional characteristics of the first inverter are reused, allowing the first inverter to provide corresponding auxiliary charging when the DC charging pile provides charging functionality, further improving overall charging efficiency. Also, when the first inverter is a unidirectional DC inverter, the bidirectional characteristics of the second inverter are reused, enabling the second inverter to provide corresponding auxiliary charging. Moreover, in grid-connected scenarios, the first and second inverters are connected in parallel to output load, thereby increasing load capacity and achieving capacity expansion. In other words, the power supply system of this application can interconnect the first DC bus of the energy storage device and the second DC bus of the DC charging pile using electrical connection lines, realizing coordinated power energy management. Please refer to the following examples for details.

[0023] See Figure 1 , Figure 1This is a schematic diagram of the structure of the first embodiment of the power supply system provided in this application. The power supply system 100 includes: an energy storage device 20, a DC charging pile 30, and an electrical connection line 40. The energy storage device 20 includes a first inverter 21, a first DC bus 25, a first voltage conversion module 22, and an energy storage battery 23, which are connected in sequence. The DC charging pile 30 includes a second inverter 31, a second DC bus 38, a second voltage conversion module 32, and a power supply port 33, which are connected in sequence. The first end of the electrical connection line 40 is used to electrically connect to the first DC bus 25, and the second end of the electrical connection line 40 is used to electrically connect to the second DC bus 38.

[0024] In some embodiments, the first terminal of the first inverter 21 is used to electrically connect to the power grid 10, and is used to invert and convert the DC power after step-down or step-up in the first voltage conversion module 22 to output to the power grid 10.

[0025] In some embodiments, the first terminal of the first inverter 21 is used to electrically connect to an AC load, and is used to invert and convert the DC power after step-down or step-up in the first voltage conversion module 22 to output to the AC load.

[0026] In some embodiments, the first terminal of the first inverter 21 is used to electrically connect the power grid 10 and the AC load, and is used to invert and convert the DC power after step-down or step-up in the first voltage conversion module 22 to output to the AC load or the power grid 10.

[0027] In some embodiments, the first voltage conversion module 22 is used to step down or step up the DC power in the energy storage battery 23.

[0028] In some embodiments, a first terminal of the first inverter 21 is connected to the power grid 10, and a first terminal of the first voltage conversion module 22 is connected to a second terminal of the first inverter 21 via a first DC bus 25. An energy storage battery 23 is connected to the second terminal of the first voltage conversion module 22. The first voltage conversion module 22 can be a DC-DC voltage converter. In some embodiments, the first voltage conversion module 22 can be an LLC voltage converter. In some embodiments, the first voltage conversion module 22 can be composed of a DC-DC voltage converter and an LLC voltage converter.

[0029] In some embodiments, the first terminal of the second inverter 31 is used for electrical connection to the power grid 10. The first terminal of the second voltage conversion module 32 is connected to the second terminal of the second inverter 31 via the second DC bus 38. The first terminal of the power supply port 33 is connected to the second terminal of the second voltage conversion module 32, and the second terminal of the power supply port 33 is used for connecting to external devices, such as a DC charging pile 30 or a power supply device. The first DC bus 25 and the second DC bus 38 are electrically connected via an electrical connection line 40.

[0030] In some embodiments, the first inverter 21 is equipped with a corresponding management system, which is responsible for realizing the orderly flow and intelligent scheduling of electrical energy among different devices. As the executor of energy flow, the management system is responsible for the electrical energy conversion and control in the energy storage device 20, and serves as a bridge connecting the power grid 10 and the battery.

[0031] For example, it can realize bidirectional conversion of electrical energy. In a complete energy storage device 20, energy flows between photovoltaic modules, batteries, grid 10, and electrical equipment, and the management system is the core bridge to realize this flow. The management system connects photovoltaic modules, grid 10 and energy storage battery 23 to realize the scheduling of energy in and out.

[0032] There are multiple current types in the system: photovoltaic modules and energy storage batteries 23 use direct current (DC); power grid 10 and household appliances rely on alternating current (AC).

[0033] The management system is responsible for individual conversion tasks between alternating current (AC) and direct current (DC): AC-DC: Converts alternating current (AC) from the grid or photovoltaic power generation into direct current (DC) to charge the battery; DC-AC: Converts the direct current stored in the battery into alternating current for use in household loads or for connection to the power grid.

[0034] In addition, the management system also has intelligent control capabilities, which can dynamically determine and execute the switching of charging, discharging and power supply modes based on real-time energy consumption, power generation, electricity price changes and other conditions.

[0035] For example, it can achieve grid-connected / off-grid switching. The management system has highly automated grid-connected / off-grid switching capabilities, ensuring continuous and stable operation of the system in multiple scenarios: Grid connection mode: When there is a power grid 10, the system can operate well with the power grid 10, supporting power generation to the grid or supplementary power from the grid. Off-grid mode: When the mains power fails, the management system can quickly switch to off-grid operation mode with a millisecond response time, and continue to supply power to critical loads (such as servers and medical equipment); Automatic recovery: After the mains power is restored, the management system can automatically detect and switch back to grid-connected mode to achieve a smooth transition without manual intervention.

[0036] This backup switching function is the core of achieving stable power supply in scenarios such as microgrid 10 and independent power systems.

[0037] For example, a safety protection mechanism can be implemented. To ensure the safe operation of the entire system, the management system has comprehensive electrical protection functions: Overvoltage protection: When the management system detects that the input or output voltage has set a safety threshold (such as the DC side exceeding the rated voltage), the system will automatically stop the operation of the relevant circuits and cut off the output. If it has a self-recovery function, it can be restarted after the voltage returns to normal.

[0038] Overcurrent protection: The management system monitors AC and DC currents in real time. Once the output current exceeds the design safe current value, protection is immediately triggered. The system quickly disconnects the output circuit, performs current limiting control or fuse activation, and dynamically adjusts the operating status through software current limiting.

[0039] Over-temperature protection: The management system has the function of real-time monitoring of the temperature of key components. When the temperature exceeds the preset threshold, it will automatically reduce the load or shut down and start the internal fan / liquid cooling system to accelerate. Some systems also support graded temperature protection (warning / limitation / immediate three-stage response).

[0040] Short circuit protection: When a short circuit occurs at the output terminal, the management system can respond within microseconds, quickly disconnect the output circuit, activate the fast fuse, record the fault type and report it to the system.

[0041] For example, it can enable real-time data monitoring and communication.

[0042] The management system is not only responsible for power conversion and dispatch, but also needs to collect, display, upload, and provide feedback on all key operational data in real time, enabling transparent monitoring and remote management of the system status. Information such as system operating status, battery level, and fault alarms can be monitored in real time via displays, apps, or cloud platforms.

[0043] In this embodiment, the first DC bus 25 of the energy storage device 20 and the second DC bus 38 of the DC charging pile 30 are interconnected using an electrical connection line 40. On the one hand, when the second inverter 31 is a unidirectional inverter, the bidirectional characteristics of the first inverter 21 are reused to realize the charging and discharging functions of the DC charging pile 30 without replacing the second inverter 31. Furthermore, when the DC charging pile 30 provides charging functionality, the first inverter 21 can also provide corresponding auxiliary charging, thereby improving overall charging efficiency. On the other hand, when the second inverter 31 is a bidirectional inverter, the bidirectional characteristics of the first inverter 21 are reused to provide bidirectional charging and discharging functions of the DC charging pile 30. When providing charging functionality, the first inverter 21 can also provide corresponding auxiliary charging, which can improve the overall charging efficiency. When the first inverter 21 is a unidirectional DC inverter, the bidirectional characteristics of the second inverter 31 are reused, and the second inverter 31 can also provide corresponding auxiliary charging. On the other hand, in the grid-connected scenario, the first inverter 21 and the second inverter 31 are connected in parallel to output load, thereby improving the load-carrying capacity and achieving the purpose of capacity expansion. That is, the power supply system 100 of this application can use the electrical connection line 40 to interconnect the first DC bus 25 of the energy storage device 20 and the second DC bus 38 of the DC charging pile 30 to realize the linkage of power energy management.

[0044] Furthermore, in the event of a failure of the second inverter 31, the first inverter 21 can be reused to enable the charging and discharging of the DC charging pile 30.

[0045] See Figure 2 , Figure 2 This is a schematic diagram of the structure of a second embodiment of the power supply system 100 provided in this application. The power supply system 100 includes: an energy storage device 20, a DC charging pile 30, and an electrical connection line 40. The energy storage device 20 includes a bidirectional inverter 24, a first DC bus 25, a first voltage conversion module 22, and an energy storage battery 23, which are connected in sequence. The DC charging pile 30 includes a unidirectional DC inverter 34, a second DC bus 38, a unidirectional voltage conversion module 35, and a power supply port 33. The first end of the electrical connection line 40 is used to electrically connect to the first DC bus 25, and the second end of the electrical connection line 40 is used to electrically connect to the second DC bus 38.

[0046] In this configuration, the first terminal of the bidirectional inverter 24 is connected to the power grid 10, and the first terminal of the first voltage conversion module 22 is connected to the second terminal of the bidirectional inverter 24 via the first DC bus 25. The energy storage battery 23 is connected to the second terminal of the first voltage conversion module 22. The first voltage conversion module 22 can be a DC-DC voltage converter. The unidirectional voltage conversion module 35 can also be a DC-DC voltage converter, such as a unidirectional DC-DC voltage converter. The bidirectional inverter 24 is equivalent to the first inverter 21 in the above embodiment.

[0047] The first terminal of the unidirectional DC inverter 34 is used for electrical connection to the power grid 10. The first terminal of the unidirectional voltage conversion module 35 is connected to the second terminal of the second inverter 31 via the second DC bus 38. The first terminal of the power supply port 33 is connected to the second terminal of the unidirectional voltage conversion module 35, and the second terminal of the power supply port 33 is used for connecting external equipment, such as a DC charging pile 30 or a power supply device. The first DC bus 25 and the second DC bus 38 are electrically connected via an electrical connection line 40. The unidirectional DC inverter 34 can be equivalent to the second inverter 31 in the above embodiment. The unidirectional voltage conversion module 35 can be equivalent to the second voltage conversion module 32 in the above embodiment.

[0048] In some embodiments, the energy storage device 20 is a photovoltaic energy storage device 20. That is, the photovoltaic energy storage device 20 also includes photovoltaic modules.

[0049] In some embodiments, the DC charging pile 30 is a unidirectional charging pile.

[0050] In this embodiment, the first DC bus 25 of the energy storage device 20 and the second DC bus 38 of the DC charging pile 30 are interconnected by the electrical connection line 40. The bidirectional characteristics of the bidirectional inverter 24 are reused to realize the charging and discharging functions of the DC charging pile 30. There is no need to replace the unidirectional DC inverter 34. When the DC charging pile 30 provides the charging function, the bidirectional inverter 24 can also provide corresponding auxiliary charging, which can improve the overall charging efficiency.

[0051] Furthermore, in the event of a failure of the unidirectional DC inverter 34, the bidirectional inverter 24 can be reused to enable the charging and discharging of the DC charging pile 30.

[0052] See Figure 3 , Figure 3 This is a schematic diagram of the third embodiment of the power supply system 100 provided in this application. The power supply system 100 includes: an energy storage device 20, a DC charging pile 30, and an electrical connection line 40. The energy storage device 20 includes a bidirectional inverter 24, a first DC bus 25, a first voltage conversion module 22, and an energy storage battery 23, which are connected in sequence. The DC charging pile 30 includes a bidirectional DC inverter 36, a second DC bus 38, a bidirectional voltage conversion module 37, and a power supply port 33. The first end of the electrical connection line 40 is used to electrically connect to the first DC bus 25, and the second end of the electrical connection line 40 is used to electrically connect to the second DC bus 38.

[0053] The first terminal of the bidirectional inverter 24 is connected to the power grid 10, and the first terminal of the first voltage conversion module 22 is connected to the second terminal of the bidirectional inverter 24 via the first DC bus 25. The energy storage battery 23 is connected to the second terminal of the first voltage conversion module 22.

[0054] The first terminal of the bidirectional DC inverter 36 is connected to the power grid 10. The first terminal of the bidirectional voltage conversion module 37 is connected to the second terminal of the second inverter 31 via the second DC bus 38. The first terminal of the power supply port 33 is connected to the second terminal of the bidirectional voltage conversion module 37, and the second terminal of the power supply port 33 is used to connect to external devices, such as a DC charging pile 30 or a power supply device. The first DC bus 25 and the second DC bus 38 are electrically connected via an electrical connection line 40. The first voltage conversion module 22 can be a DC-DC voltage converter. The bidirectional voltage conversion module 37 can also be a DC-DC voltage converter, such as a bidirectional DC-DC voltage converter. The bidirectional voltage conversion module 37 can be equivalent to the second voltage conversion module 32 in the above embodiment. The bidirectional DC inverter 36 can be equivalent to the second inverter 31 in the above embodiment.

[0055] In some embodiments, the energy storage device 20 is a photovoltaic energy storage device 20. That is, the photovoltaic energy storage device 20 also includes photovoltaic modules.

[0056] In some embodiments, the DC charging pile 30 is a bidirectional charging pile.

[0057] In this embodiment, the first DC bus 25 of the energy storage device 20 and the second DC bus 38 of the DC charging pile 30 are interconnected by the electrical connection line 40. When the DC charging pile 30 provides charging function, the bidirectional inverter 24 can also provide corresponding auxiliary charging, which can improve the overall charging efficiency. In the grid-connected scenario, the bidirectional inverter 24 and the bidirectional DC inverter 36 are connected in parallel to output load, thereby improving the load capacity and achieving the purpose of capacity expansion.

[0058] Furthermore, in the event of a failure of the bidirectional DC inverter 36, the bidirectional inverter 24 can be reused to enable the charging and discharging of the DC charging pile 30.

[0059] In some embodiments, the first inverter 21 described above includes a unidirectional DC inverter. The second inverter 31 described above includes a bidirectional DC inverter.

[0060] See Figure 4 The first terminal of the aforementioned first voltage conversion module 22 includes a first positive terminal and a first negative terminal.

[0061] The first inverter 21 mentioned above includes: a first bridge arm and a second bridge arm.

[0062] The first bridge arm includes a first power unit and a second power unit. A first terminal of the first power unit is connected to the first positive terminal of the first voltage conversion module 22, a second terminal of the first power unit is connected to the first terminal of the second power unit, and a second terminal of the second power unit is connected to the first negative terminal of the first voltage conversion module 22. The connection point between the first power unit and the second power unit is connected to the first terminal of the power grid. In some embodiments, the first power unit is composed of a power device Q1, and the second power unit is composed of a power device Q2.

[0063] The second bridge arm includes a third power unit and a fourth power unit; wherein, the first end of the third power unit is connected to the first positive terminal of the first voltage conversion module 22, the second end of the third power unit is connected to the first end of the fourth power unit, the second end of the fourth power unit is connected to the first negative terminal of the first voltage conversion module 22, and the connection point between the third power unit and the fourth power unit is connected to the second terminal of the power grid. In some embodiments, the third power unit is composed of a power device Q3. The fourth power unit is composed of a power device Q4.

[0064] The aforementioned first voltage conversion module 22 includes: a transformer module, a first-side power unit, and a second-side power unit.

[0065] A transformer module can consist of a transformer T1, an inductor, and a capacitor.

[0066] The first end of the first power unit serves as the second end of the first voltage conversion module 22 and is connected to the energy storage battery. The second end of the first power unit is connected to one side of the transformer module.

[0067] In some embodiments, the first-side power unit may be composed of power devices Q13, Q14, Q15, and Q16. The connection point between power devices Q13 and Q14 is connected to the first terminal of transformer T1. The connection point between power devices Q15 and Q16 is connected to the second terminal of transformer T1. See the documentation for specific connection relationships. Figure 4 This will not be elaborated upon here.

[0068] The first end of the second-side power unit is connected to the other side of the transformer module, and the second end of the second-side power unit serves as the first end of the first voltage conversion module 22, connected to the second end of the first inverter 21. In some embodiments, the second-side power unit may be composed of power devices Q17, Q18, Q19, and Q20. The connection point between power devices Q17 and Q18 is connected to one end of a capacitor. The other end of capacitor C1 is connected to the third end of transformer T1 via an inductor. The connection point between power devices Q19 and Q20 is connected to the fourth end of transformer T1. A capacitor is connected between power devices Q19 and Q20. The two ends of this capacitor can serve as the external DC interface of the aforementioned energy storage device 20, interconnecting with the second end of the second inverter 31 in the DC charging pile 30.

[0069] In some embodiments, see Figure 5 ,and Figure 4 The difference lies in that the first inverter 21 also includes: a first bridge arm lateral power unit and a second bridge arm lateral power unit. The first bridge arm lateral power unit is composed of power devices Q7 and Q8, and the second bridge arm lateral power unit is composed of power devices Q9 and Q10.

[0070] In some embodiments, see Figure 6 ,and Figure 5 The difference lies in that the first inverter 21 also includes power devices Q41 and Q42. Power devices Q41 and Q42 can work together to switch between three-level and two-level modes. The connection point between power devices Q41 and Q42 is connected to the neutral terminal via an inductor.

[0071] In some embodiments, see Figure 7 ,and Figure 4 The difference lies in that the first inverter 21 further includes a third bridge arm. The third bridge arm includes a fifth power unit and a sixth power unit. The first terminal of the fifth power unit is connected to the first positive terminal of the first voltage conversion module 22, the second terminal of the fifth power unit is connected to the first terminal of the sixth power unit, the second terminal of the sixth power unit is connected to the first negative terminal of the first voltage conversion module 22, and the connection point between the fifth and sixth power units is connected to the third terminal of the power grid. In some embodiments, the fifth power unit is composed of power device Q5, and the sixth power unit is composed of power device Q6.

[0072] thus, Figure 7 The first inverter 21 can be a three-phase inverter. The first bridge arm corresponds to the U phase, the second bridge arm corresponds to the V phase, and the third bridge arm corresponds to the W phase.

[0073] In some embodiments, see Figure 8 ,and Figure 7 The difference lies in that the first inverter 21 includes: a first bridge arm lateral power unit, a second bridge arm lateral power unit, and a third bridge arm lateral power unit. The first bridge arm lateral power unit is composed of power devices Q7 and Q8, the second bridge arm lateral power unit is composed of power devices Q9 and Q10, and the third bridge arm lateral power unit is composed of power devices Q11 and Q12.

[0074] See Figure 9 The first terminal of the aforementioned second voltage conversion module 32 includes a first positive terminal and a first negative terminal.

[0075] The aforementioned second inverter 31 includes: a first bridge arm and a second bridge arm.

[0076] The first bridge arm includes a seventh power unit and an eighth power unit. The first terminal of the seventh power unit is connected to the first positive terminal of the second voltage conversion module 32, the second terminal of the seventh power unit is connected to the first terminal of the eighth power unit, and the second terminal of the eighth power unit is connected to the first negative terminal of the second voltage conversion module 32. The connection point between the seventh and eighth power units is connected to the first terminal of the power grid. In some embodiments, the seventh power unit is composed of a power device Q21, and the eighth power unit is composed of a power device Q22.

[0077] The second bridge arm includes a ninth power unit and a tenth power unit; wherein, the first terminal of the ninth power unit is connected to the first positive terminal of the second voltage conversion module 32, the second terminal of the ninth power unit is connected to the first terminal of the tenth power unit, the second terminal of the tenth power unit is connected to the first negative terminal of the second voltage conversion module 32, and the connection point between the ninth and tenth power units is connected to the second terminal of the power grid. In some embodiments, the ninth power unit is composed of power device Q23. The tenth power unit is composed of power device Q24.

[0078] The aforementioned second voltage conversion module 32 includes: a transformer module, a first-side power unit, and a second-side power unit.

[0079] A transformer module can consist of a transformer T2, an inductor, and a capacitor.

[0080] The first end of the first power unit is connected to the power supply port as the second end of the second voltage conversion module 32, and the second end of the first power unit is connected to one side of the transformer module.

[0081] In some embodiments, the first-side power unit may be composed of power devices Q33, Q34, Q35, and Q36. The connection point between power devices Q33 and Q34 is connected to the first terminal of transformer T2. The connection point between power devices Q35 and Q36 is connected to the second terminal of transformer T2. See the documentation for specific connection relationships. Figure 8 This will not be elaborated upon here.

[0082] The first end of the second-side power unit is connected to the other side of the transformer module, and the second end of the second-side power unit serves as the first end of the second voltage conversion module 32, connected to the second end of the second inverter 31. In some embodiments, the second-side power unit may be composed of power devices Q37, Q38, Q39, and Q40. The connection point between power devices Q37 and Q38 is connected to one end of a capacitor. The other end of the capacitor is connected to the third end of the transformer T2 via an inductor. The connection point between power devices Q39 and Q40 is connected to the fourth end of the transformer T2. A capacitor is connected between power devices Q39 and Q40. The two ends of the capacitor can serve as the external DC interface of the DC charging pile 30, interconnected with the second end of the first inverter 2121 in the energy storage device 20.

[0083] In some embodiments, see Figure 10 ,and Figure 9 The difference lies in that the second inverter 31 includes: a first bridge arm lateral power unit and a second bridge arm lateral power unit. The first bridge arm lateral power unit is composed of power devices Q27 and Q28, and the second bridge arm lateral power unit is composed of power devices Q29 and Q30.

[0084] See Figure 11 ,and Figure 10 The difference lies in that the second inverter 31 also includes power devices Q43 and Q44. Power devices Q43 and Q44 can work together to switch between three-level and two-level modes. The connection point between power devices Q43 and Q44 is connected to the neutral terminal via an inductor.

[0085] In some embodiments, see Figure 12 ,and Figure 9The difference lies in that the second inverter 31 also includes a third bridge arm. The third bridge arm includes an eleventh power unit and a twelfth power unit. The first terminal of the eleventh power unit is connected to the first positive terminal of the second voltage conversion module 32, the second terminal of the eleventh power unit is connected to the first terminal of the twelfth power unit, the second terminal of the twelfth power unit is connected to the first negative terminal of the second voltage conversion module 32, and the connection point between the eleventh and twelfth power units is connected to the third terminal of the power grid. In some embodiments, the eleventh power unit is composed of power device Q25, and the twelfth power unit is composed of power device Q26.

[0086] thus, Figure 12 The second inverter 31 can be a three-phase inverter. The first bridge arm corresponds to the U phase, the second bridge arm corresponds to the V phase, and the third bridge arm corresponds to the W phase.

[0087] In some embodiments, see Figure 13 ,and Figure 12 The difference lies in that the second inverter 31 includes: a first bridge arm lateral power unit and a second bridge arm lateral power unit. The first bridge arm lateral power unit is composed of power devices Q27 and Q28, and the second bridge arm lateral power unit is composed of power devices Q29 and Q30.

[0088] See Figure 14 , Figure 14 This is a schematic diagram of an embodiment of the energy storage device provided in this application. The energy storage device 20 includes a bidirectional inverter 24, a first DC bus 25, a first voltage conversion module 22, an energy storage battery 23, and an MPPT module, which are connected in sequence.

[0089] The first voltage conversion module further includes an LLC converter 221 and a voltage conversion unit 222. The first terminal of the voltage conversion unit serves as the second terminal of the first voltage conversion module and is connected to the energy storage battery; the second terminal of the voltage conversion unit is connected to the first terminal of the first-side power unit. The voltage conversion unit can be a DC-DC conversion circuit.

[0090] The first terminal of the MPPT module is electrically connected to the second terminal of the voltage conversion unit. The second terminal of the MPPT module is used to connect to external photovoltaic equipment for maximum power point tracking of the input power of the photovoltaic equipment.

[0091] In some embodiments, the MPPT module includes a BOOST circuit.

[0092] In some embodiments, the MPPT module includes a BUCK-BOOST circuit.

[0093] In summary, the power supply system 100 provided in this application includes: an energy storage device 20, a DC charging pile 30, and an electrical connection line 40. The energy storage device 20 includes a first inverter 21, a first DC bus 25, a first voltage conversion module 22, and an energy storage battery 23, all connected in sequence. The DC charging pile 30 includes a second inverter 31, a second DC bus 38, a second voltage conversion module 32, and a power supply port 33, all connected in sequence. The electrical connection line 40 interconnects the first DC bus 25 of the energy storage device 20 and the second DC bus 38 of the DC charging pile 30. On one hand, when the second inverter 31 is a unidirectional inverter, the bidirectional characteristics of the first inverter 21 are reused to realize the charging and discharging functions of the DC charging pile 30, eliminating the need to replace the second inverter 31 and saving hardware costs. Furthermore, when the DC charging pile 30 provides charging functionality, the first inverter 21 can also provide corresponding auxiliary charging, thereby improving overall charging efficiency. On the other hand, when the second inverter 31 is a bidirectional inverter... The bidirectional characteristics of the first inverter 21 are reused, and when the DC charging pile 30 provides charging function, the first inverter 21 can also provide corresponding auxiliary charging, which can improve the overall charging efficiency. When the first inverter 21 is a unidirectional DC inverter, the bidirectional characteristics of the second inverter 31 are reused, and the second inverter 31 can also provide corresponding auxiliary charging. On the other hand, in the grid-connected scenario, the first inverter 21 and the second inverter 31 are connected in parallel to output load, thereby improving the load capacity and achieving the purpose of capacity expansion. That is, the power supply system 100 of this application can use the electrical connection line 40 to interconnect the first DC bus 25 of the energy storage device 20 and the second DC bus 38 of the DC charging pile 30 to realize the linkage of power energy management.

[0094] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0095] If the integrated units in the other embodiments described above are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0096] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A power supply system, characterized in that, The power supply system includes: An energy storage device includes a first inverter, a first DC bus, a first voltage conversion module, and an energy storage battery connected in sequence. The first voltage conversion module is used to step down or step up the DC power in the energy storage battery. The first terminal of the first inverter is used to be electrically connected to the power grid and / or an AC load, and is used to invert and convert the stepped-down or stepped-up DC power in the first voltage conversion module to output to the AC load or the power grid. A DC charging pile, comprising a second inverter, a second DC bus, a second voltage conversion module, and a power supply port connected in sequence, wherein the first end of the second inverter is used to be electrically connected to the power grid; An electrical connection wire, wherein a first end of the electrical connection wire is used to electrically connect to the first DC bus, and a second end of the electrical connection wire is used to electrically connect to the second DC bus.

2. The power supply system according to claim 1, characterized in that, The first terminal of the first voltage conversion module includes a first positive terminal and a first negative terminal, and the first inverter includes: The first bridge arm includes a first power unit and a second power unit; wherein, a first end of the first power unit is connected to the first positive terminal of the first voltage conversion module, a second end of the first power unit is connected to the first end of the second power unit, a second end of the second power unit is connected to the first negative terminal of the first voltage conversion module, and the connection point between the first power unit and the second power unit is connected to the first end of the power grid. The second bridge arm includes a third power unit and a fourth power unit; wherein, the first end of the third power unit is connected to the first positive terminal of the first voltage conversion module, the second end of the third power unit is connected to the first end of the fourth power unit, the second end of the fourth power unit is connected to the first negative terminal of the first voltage conversion module, and the connection point between the third power unit and the fourth power unit is connected to the second end of the power grid.

3. The power supply system according to claim 2, characterized in that, The first inverter also includes: The third bridge arm includes a fifth power unit and a sixth power unit; wherein, the first end of the fifth power unit is connected to the first positive terminal of the first voltage conversion module, the second end of the fifth power unit is connected to the first end of the sixth power unit, the second end of the sixth power unit is connected to the first negative terminal of the first voltage conversion module, and the connection point between the fifth power unit and the sixth power unit is connected to the third terminal of the power grid.

4. The power supply system according to claim 2 or 3, characterized in that, The first voltage conversion module includes: Transformer module; The first side power unit, the first end of the first side power unit is connected to the energy storage battery as the second end of the first voltage conversion module, and the second end of the first side power unit is connected to one side of the transformer module; The second power unit has its first end connected to the other side of the transformer module, and its second end serves as the first end of the first voltage conversion module, connected to the second end of the first inverter.

5. The power supply system according to claim 1, characterized in that, The first inverter includes a bidirectional inverter, and the second inverter includes a unidirectional DC inverter.

6. The power supply system according to claim 1, characterized in that, The first inverter includes a unidirectional DC inverter, and the second inverter includes a bidirectional DC inverter.

7. The power supply system according to claim 1, characterized in that, The first inverter includes a bidirectional inverter, and the second inverter is a bidirectional DC inverter.

8. The power supply system according to claim 1, characterized in that, The second voltage conversion module is a bidirectional voltage conversion module.

9. The power supply system according to claim 4, characterized in that, The first voltage conversion module further includes: A voltage conversion unit, wherein the first end of the voltage conversion unit serves as the second end of the first voltage conversion module and is connected to the energy storage battery; the second end of the voltage conversion unit is connected to the first end of the first side power unit. The energy storage device also includes an MPPT module, the first end of which is electrically connected to the second end of the voltage conversion unit. The second end of the MPPT module is used to connect to an external photovoltaic device for maximum power point tracking of the input power of the photovoltaic device.

10. The power supply system according to claim 9, characterized in that, The MPPT module includes a BOOST circuit or a BUCK-BOOST circuit.

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