Power supply system and device

Abstract

This application provides a power supply system and device, belonging to the field of power supply technology, including: a conversion module, which includes a DC terminal; a first power supply module connected to the DC terminal, which includes an energy storage unit for supplying power to a drive unit and a power consumption unit; and a second power supply module connected to both the DC terminal and the energy storage unit. The power supply system provided by this application achieves current conversion and output through the conversion module, and stores and supplies power through the first and second power supply modules respectively, reducing the number of rectifier units in the power supply system, lowering current-related damage, and reducing the burden on the power supply system.

Description

Technical Field

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

[0002] Power supply systems typically need to power various electrical devices, each with different current characteristics. The power supply system converts the current according to the needs of these devices to provide power. Therefore, the power supply system needs to be equipped with different rectifier units. However, too many rectifier units can lead to excessive current loss in the power supply system, increasing its workload. Summary of the Invention

[0003] This application provides a power supply system and device to solve the above-mentioned technical problems.

[0004] In a first aspect, embodiments of this application provide a power supply system, including:

[0005] The conversion module includes a DC terminal;

[0006] A first power supply module is connected to the DC terminal. The first power supply module includes an energy storage unit, which is used to supply power to the drive unit and the power consumption unit.

[0007] The second power supply module is connected to both the DC terminal and the energy storage unit.

[0008] In conjunction with the first aspect, the power supply system further includes:

[0009] A first conversion unit has its input terminal connected to the DC terminal to obtain DC power, and its output terminal connected to the drive unit. The first conversion unit is used to convert the DC power into a three-phase current that matches the drive unit.

[0010] In conjunction with the first aspect, the first conversion unit includes a first DC-AC converter.

[0011] In conjunction with the first aspect, the first power supply module further includes a second conversion unit. The input terminal of the second conversion unit is connected to the DC terminal to obtain DC power. The output terminal of the second conversion unit is used to connect to a storage unit for storing data. The second conversion unit is used to convert the DC power into AC power that is compatible with the storage unit.

[0012] In conjunction with the first aspect, the first power supply module further includes a switching unit, which is connected between the second conversion unit and the conversion module.

[0013] In conjunction with the first aspect, the switching unit includes any one of a relay, a MOSFET, and an optocoupler.

[0014] In conjunction with the first aspect, the first power supply module further includes a third conversion unit, one end of which is connected to the energy storage unit and the other end of which is connected to the DC terminal. The third conversion unit is used to convert the DC power input and output of the energy storage unit.

[0015] In conjunction with the first aspect, the second conversion unit includes a second DC-AC converter, and the third conversion unit includes a bidirectional DC-DC converter.

[0016] In conjunction with the first aspect, the conversion module further includes a three-phase terminal for connecting to the power grid, and a DC terminal for connecting to a DC bus. Both the first power supply module and the second power supply module are connected to the DC bus.

[0017] In conjunction with the first aspect, the conversion module includes a bidirectional AC-DC converter; the second power supply module includes a photovoltaic unit, which is connected to the energy storage unit and the DC terminal respectively, and the photovoltaic unit is used to charge the energy storage unit or feed power to the grid through the bidirectional AC-DC converter.

[0018] In conjunction with the first aspect, the second power supply module further includes a fourth conversion unit, one end of which is connected to the photovoltaic unit and the other end of which is connected to the DC bus. The fourth conversion unit is used to convert the DC power output by the photovoltaic unit.

[0019] Secondly, embodiments of this application provide a power supply device, including: a power supply system as described in any one of the first aspects.

[0020] One of the above technical solutions has the following advantages or beneficial effects:

[0021] This application provides a power supply system comprising: a conversion module including a DC terminal; a first power supply module connected to the DC terminal, the first power supply module including an energy storage unit for supplying power to a drive unit and a power consumption unit; and a second power supply module connected to both the DC terminal and the energy storage unit. The power supply system provided in this application achieves current conversion and output through the conversion module, and stores and supplies power through the first and second power supply modules respectively, reducing the number of rectifier units in the power supply system, lowering current-induced damage, and alleviating the burden on the power supply system. Attached Figure Description

[0022] 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.

[0023] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0024] Figure 1 A schematic diagram of the power supply system provided in the embodiments of this application;

[0025] Figure 2 A circuit diagram of the power supply system provided in the embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the scheduling method steps for a power supply system provided in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the scheduling method for a power supply system provided in an embodiment of this application;

[0028] Figure 5 A schematic diagram of a power supply device provided in an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100 - Conversion module; 200 - First conversion unit; 300 - First power supply module; 310 - Switching unit; 320 - Second conversion unit; 330 - Third conversion unit; 340 - Energy storage unit; 400 - Second power supply module; 410 - Fourth conversion unit; 420 - Photovoltaic unit; 500 - Fifth conversion unit; 600 - Drive unit; 700 - Power consumption unit; 800 - Power grid; 900 - Storage unit. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0032] In the embodiments of this application, "at least one" refers to one or more; "multiple" refers to two or more. In the description of this application, the terms "first," "second," "third," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0033] References such as “one embodiment” or “some embodiments” as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the terms “comprising,” “including,” “having,” and variations thereof, as used in this specification, mean “including, but not limited to,” unless otherwise specifically emphasized.

[0034] It should be noted that in the embodiments of this application, "and / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after it are in an "or" relationship.

[0035] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0036] The specific implementation methods of this application are illustrated below through examples:

[0037] like Figure 1 and Figure 2 As shown, this application embodiment provides a power supply system, including: a conversion module 100, which includes a DC terminal; a first power supply module 300 connected to the DC terminal, which includes an energy storage unit 340 for supplying power to a drive unit 600 and a power consumption unit 700; and a second power supply module 400 connected to both the DC terminal and the energy storage unit 340. Specifically, the conversion module 100 converts input electrical energy into DC power; the converted DC power is then delivered to the energy storage unit 340 for energy storage; after energy storage, the energy storage unit 340 releases current to the drive unit 600 and the power consumption unit 700, thereby providing electrical energy to them. The second power supply module 400 can also deliver DC power to the energy storage unit 340 for energy storage.

[0038] It is understood that the power supply system provided in this application embodiment realizes current conversion and output through conversion module 100, and stores energy and supplies power through first power supply module 300 and second power supply module 400 respectively, thereby reducing the number of rectifier units in the power supply system, reducing current damage to the power supply system, and alleviating the burden on the power supply system.

[0039] like Figure 1 and Figure 2 As shown in this embodiment, the power supply system further includes a first conversion unit 200. The input terminal of the first conversion unit 200 is connected to a DC terminal to obtain DC power. The output terminal of the first conversion unit 200 is used to connect to a drive unit 600. The first conversion unit 200 is used to convert the DC power into a three-phase current that matches the drive unit 600. Specifically, the drive unit 600 includes a three-phase drive motor. The input terminal of the first conversion unit 200 obtains DC power from the DC terminal of the conversion module 100, and after conversion, outputs a three-phase current adapted to the three-phase drive motor from its output terminal. The three-phase current is respectively input to the three input terminals of the three-phase drive motor. After the three-phase drive motor is running, it can drive high-power loads, such as elevators, air conditioners, and water pumps. It is conceivable that in some embodiments of this application, the drive unit 600 may also include a two-phase drive motor; the first conversion unit 200 can convert the DC power output by the conversion module 100 and output it from the output terminal to the two-phase AC power adapted to the two-phase drive motor, and drive the two-phase drive motor to rotate through the two-phase AC power to drive a small power load, such as a printer or an exhaust fan.

[0040] It is understandable that by setting the first conversion unit 200 to convert the DC power output by the conversion module 100 into AC power adapted to the drive unit 600, it is ensured that the drive unit 600 can operate and drive the corresponding load.

[0041] like Figure 1 and Figure 2 As shown in this embodiment, the first conversion unit 200 includes a first DC-AC converter. Specifically, a DC-AC converter, also known as an inverter, is a power electronic device that converts direct current (DC) into alternating current (AC). When the drive unit 600 is a three-phase drive motor, the first DC-AC converter can convert the DC power output from the conversion module 100 into three-phase current for use by the three-phase drive motor; when the drive unit 600 is a two-phase drive motor, the first DC-AC converter can convert the DC power output from the conversion module 100 into two-phase alternating current for use by the two-phase drive motor.

[0042] It is understandable that by setting up the first DC-AC converter, the DC power output by the conversion module 100 is converted into current that is compatible with the corresponding drive motor, so that the drive motor can drive the corresponding load.

[0043] like Figure 1 and Figure 2 As shown in this embodiment, the first power supply module 300 further includes a second conversion unit 320. The input terminal of the second conversion unit 320 is connected to a DC terminal to obtain DC power, and the output terminal of the second conversion unit 320 is used to connect to a storage unit 900 for storing data. The second conversion unit 320 converts the DC power into AC power compatible with the storage unit 900. Specifically, the storage unit 900 includes a database server room, which refers to a physical space specifically used for storing and maintaining database servers and related equipment. To ensure data security and prevent data loss, database server rooms are typically equipped with an uninterruptible power supply system (UPS) to cope with sudden power outages. Under normal power conditions, the second conversion unit 320 converts the DC power supplied by the conversion module 100 into AC power compatible with the database server room for its use. In the event of an external power outage, the energy storage unit 340 serves as backup power support. The energy storage unit 340 transmits DC power to the second conversion unit 320, which converts the DC power transmitted by the energy storage unit 340 into AC power for use in the database room, thereby preventing data loss in the database room due to power outage.

[0044] Understandably, by setting up the second conversion unit 320, the DC power supplied by the conversion module 100 can be converted into AC power for use by the storage unit 900 under normal power conditions. Moreover, when the external power supply is interrupted, the DC power supplied by the energy storage unit 340 can be converted into AC power for use by the storage unit 900, thereby avoiding data loss in the storage unit 900 due to power failure and improving the data security of the storage unit 900.

[0045] like Figure 1 and Figure 2As shown in this embodiment, the first power supply module 300 further includes a switch unit 310, which is connected between the second conversion unit 320 and the conversion module 100. Specifically, the switch unit 310 is used to control the connection state between the second conversion module and the conversion module 100. When the switch unit 310 is connected, the second conversion unit 320 is connected to the conversion module 100, and the DC power output from the DC terminal of the conversion module 100 is converted by the second conversion unit 320 to power the storage unit 900. When the switch unit 310 is disconnected, the second conversion unit 320 is disconnected from the conversion module 100, and the DC power output from the energy storage unit 340 is converted by the second conversion unit 320 to power the storage unit 900.

[0046] It is understandable that by setting a switch unit 310 between the second conversion unit 320 and the conversion module 100, the connection between the storage unit 900 and the conversion module 100 can be controlled. Since the storage unit 900 requires stable and safe electrical energy, when the electrical energy output by the conversion module 100 is abnormal and cannot meet the power requirements of the storage unit 900, the switch unit 310 can be controlled to disconnect, thereby ensuring that the storage unit 900 is not disturbed by abnormal current, thus protecting the storage unit 900 and improving the security of the data in the storage unit 900.

[0047] like Figure 1 and Figure 2 As shown in the embodiments of this application, the switching unit 310 includes any one of a relay, a MOSFET, and an optocoupler. Specifically, when the switching unit 310 is a MOSFET, the source and drain of the MOSFET are connected to the second conversion unit 320 and the conversion module 100, respectively. By supplying a corresponding high-level or low-level voltage to the gate of the MOSFET, the conduction and cutoff of the MOSFET can be controlled, thereby realizing the connection state of the second conversion unit 320 and the conversion module 100. Similarly, when the switching unit 310 is a relay, two pins of the relay are connected to the second conversion unit 320 and the conversion module 100, respectively, and the control pin is connected to the power supply. When the control pin is energized, the second conversion unit 320 and the conversion module 100 are connected, and when the control pin is energized, the second conversion unit 320 and the conversion module 100 are connected. When the pin is de-energized, the second conversion unit 320 and the conversion module 100 are disconnected. When the switching unit 310 is an optocoupler, the input terminal of the optocoupler is connected to the power supply, and the two output terminals are connected to the second conversion unit 320 and the conversion module 100 respectively. When there is current input at the input terminal, the light-emitting device converts the input electrical signal into an optical signal, and the receiving device restores the optical signal to an electrical signal for output, thereby turning on the two output terminals. At this time, the second conversion unit 320 and the conversion module 100 are connected. When there is no current input at the input terminal or the input current is insufficient to excite the light-emitting device to emit light, the second conversion unit 320 and the conversion module 100 are disconnected.

[0048] Understandably, different forms of the switching unit 310 can be selected according to the actual situation of the circuit, so that when the power output of the conversion module 100 is abnormal, the switching unit 310 is controlled to disconnect, thereby ensuring that the storage unit 900 is not disturbed by abnormal current, realizing the protection of the storage unit 900 and improving the security of the data in the storage unit 900.

[0049] like Figure 1 and Figure 2 As shown in this embodiment, the first power supply module 300 further includes a third conversion unit 330. One end of the third conversion unit 330 is connected to the energy storage unit 340, and the other end is connected to a DC terminal. The third conversion unit 330 is used to convert the DC power input and output of the energy storage unit 340. Specifically, when the energy storage unit 340 needs to store electrical energy, the DC power output from the DC terminal of the conversion module 100 is mismatched with the charging current of the energy storage unit 340. To avoid damage to the energy storage unit 340 due to excessive current, the third conversion unit 330 converts the DC power output from the conversion module 100 to meet the charging requirements of the energy storage unit 340. When the energy storage unit 340 needs to output electrical energy, the DC power output from the energy storage unit 340 cannot directly drive the corresponding drive unit 600 or power consumption unit 700. Therefore, the third conversion unit 330 is needed to convert the DC power output from the energy storage unit 340 into the corresponding DC power. It is conceivable that the energy storage unit 340 can transmit DC power to the DC terminal of the conversion module 100 through the third conversion unit 330, thereby improving the output efficiency of the conversion module 100 and reducing the burden on the conversion module 100.

[0050] It is understandable that by setting the third conversion unit 330, the charging current and discharging current of the energy storage unit 340 can be converted, thereby protecting the energy storage unit 340 during the charging process and improving the discharging efficiency of the energy storage unit 340.

[0051] like Figure 1 and Figure 2As shown in the embodiments of this application, the second conversion unit 320 includes a second DC-AC converter, and the third conversion unit 330 includes a bidirectional DC-DC converter. Specifically, the DC-AC converter is a unidirectional converter, mainly used to convert the DC power output from the conversion module 100 and the DC power output from the energy storage unit 340 into AC power for use by the drive unit 600; while the bidirectional DC-DC converter is a bidirectional converter, mainly used to convert the input and output DC power of the energy storage unit 340, thereby realizing the charging and discharging needs of the energy storage unit 340. In some embodiments of this application, the second conversion unit 320 may also adopt a bidirectional DC-AC converter, thereby meeting the requirement that the drive motor can be used to generate electricity in some situations, and the generated AC power is converted into DC power by the bidirectional DC-AC converter and then sent to the conversion module 100.

[0052] Understandably, by setting up a second DC-AC converter and a bidirectional DC-DC converter, the use of the drive unit 600 and the energy storage unit 340 is realized, which improves the multiple modes of the power supply system and enhances the operability of the power supply system.

[0053] like Figure 1 and Figure 2 As shown in this embodiment, the conversion module 100 further includes a three-phase terminal for connecting to the power grid 800, and a DC terminal for connecting to the DC bus. Both the first power supply module 300 and the second power supply module 400 are connected to the DC bus. Specifically, the power grid 800 is a system that transmits electrical energy generated by power plants to power-consuming terminals via transmission lines, and consists of transmission lines, substations, and a distribution network 800. The power grid 800 enables large-scale transmission and distribution of electrical energy, optimizes resource allocation, and reduces waste. The power grid 800 can monitor load and adjust supply through automated equipment to ensure stable power supply and improve reliability through mutual backup of multiple lines.

[0054] In this embodiment, the DC bus is a conductive device used to transmit and distribute DC power, capable of transmitting high-power DC power from the power grid to various load devices. The DC bus is made of low-resistance material, which reduces heat loss during power transmission and has the ability to withstand high current and voltage; compared to ordinary wires, it has lower resistance loss and higher conductivity.

[0055] It is worth noting that the power grid 800 typically transmits 380V three-phase AC power. The three-phase terminals of the conversion module 100 are connected to the three transmission lines of the power grid 800, respectively, to convert the received three-phase AC power into DC power. The DC power converted by the conversion module 100 is then transmitted to the DC bus at the DC end. The DC bus supplies the converted DC power to the drive unit 600, the power consumption unit 700, and the first power supply module 300.

[0056] Understandably, by setting up a DC bus, the DC power converted by the conversion module 100 can be delivered to various loads. Furthermore, the DC bus has better conductivity and higher load-bearing capacity, which can reduce the loss of electrical energy during transmission.

[0057] like Figure 1 and Figure 2 As shown in this embodiment, the conversion module 100 includes a bidirectional AC-DC converter; the second power supply module 400 includes a photovoltaic unit 420, which is connected to the energy storage unit 340 and the DC terminal respectively. The photovoltaic unit 420 is used to charge the energy storage unit 340 or to feed power to the grid 800 through the bidirectional AC-DC converter. Specifically, the bidirectional AC-DC converter is a power electronic device capable of bidirectional and efficient conversion between AC and DC power. The photovoltaic unit 420 includes a photovoltaic panel, which is used to receive sunlight and directly convert sunlight into DC power output. In this embodiment, in rectification mode, the bidirectional AC-DC converter converts the three-phase AC power of the grid 800 into DC power and supplies it to the DC bus for use by the drive unit 600 and the power consumption unit 700; in inverter mode, it converts the DC power on the DC bus into three-phase AC power and inputs it into the grid 800. It is worth noting that during the day, when the power demand of the drive unit 600 and the power consumption unit 700 is high, the bidirectional AC-DC converter converts the three-phase AC power from the grid 800 into DC power through rectification mode and inputs it into the DC bus. At the same time, the photovoltaic unit 420 of the grid 800 inputs the DC power it generates into the DC bus for use by the drive unit 600 and the power consumption unit 700. When the power demand of the drive unit 600 and the power consumption unit 700 is low, the photovoltaic unit 420 stores a portion of the electrical energy in the energy storage unit 340 and transmits the other portion of the electrical energy to the bidirectional AC-DC converter. The bidirectional AC-DC converter converts the DC power transmitted by the photovoltaic unit 420 into three-phase AC power through its inverter mode and transmits it to the grid 800, thus achieving grid feeding. At night, when the power demand of the drive unit 600 and the power consumption unit 700 is low, the bidirectional AC-DC converter converts the three-phase AC power from the grid 800 into DC power to charge the energy storage unit 340, thereby achieving peak shaving and valley filling and saving electricity costs.

[0058] Understandably, the bidirectional AC-DC converter can distribute the power from the grid 800, photovoltaic unit 420 and energy storage unit 340 in the power supply system, thereby achieving power balance among the grid 800, photovoltaic unit 420 and energy storage unit 340, thus reducing excessive power consumption in the power supply system, reducing power loss and saving electricity costs.

[0059] like Figure 1 and Figure 2As shown in this embodiment, the second power supply module 400 further includes a fourth conversion unit 410. One end of the fourth conversion unit 410 is connected to the photovoltaic unit 420, and the other end is connected to the DC bus. The fourth conversion unit 410 is used to convert the DC power output by the photovoltaic unit 420. Specifically, the fourth conversion unit 410 includes a DC-DC converter. When the photovoltaic unit 420 supplies DC power to the DC bus, the DC power needs to be converted into DC power that can adapt to the DC bus voltage through the DC-DC converter. When the photovoltaic unit 420 supplies DC power to the energy storage unit 340 alone, the DC power can be converted into DC power that can adapt to the charging current of the energy storage unit 340 through the DC-DC converter.

[0060] It is understandable that the fourth conversion unit 410 can convert the DC power output by the photovoltaic unit 420 into DC power that can be adapted to the DC bus or the energy storage unit 340, thereby improving the current conversion efficiency.

[0061] like Figure 1 and Figure 2 As shown in this embodiment, the power supply system further includes a fifth conversion unit 500. One end of the fifth conversion unit 500 is connected to the DC bus, and the other end is connected to the electrical equipment. Specifically, the fifth conversion unit 500 includes a DC-DC converter. When the electrical equipment needs power, the DC-DC converter converts the DC power in the DC bus into DC power that can be adapted to the electrical equipment for its use. In this embodiment, the electrical equipment includes lights, displays, speakers, and other electrical loads.

[0062] It is understandable that by setting the fifth conversion unit 500, the DC power in the DC bus can be converted for use by various electrical equipment, thereby ensuring that the electrical equipment can operate normally.

[0063] like Figure 2As shown in this embodiment, the power supply system further includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; wherein, the two ends of the first capacitor C1 are respectively connected to the two input terminals of the first conversion unit 200, and the first capacitor C1 is used to filter the DC power input to the first conversion unit 200; the two ends of the second capacitor C2 are respectively connected to the two input terminals of the second conversion unit 320, and the second capacitor C2 is used to filter the DC power input to the second conversion unit 320; the two ends of the third capacitor C3 are respectively connected to the two input terminals of the conversion module 100. The third capacitor C3 is used to filter the DC power output by the conversion module 100; the two ends of the fourth capacitor C4 are respectively connected to the two input terminals of the third conversion unit 330, and the fourth capacitor C4 is used to filter the DC power input or output by the third conversion unit 330; the two ends of the fifth capacitor C5 are respectively connected to the two input terminals of the fourth conversion unit 410, and the fifth capacitor C5 is used to filter the DC power input to the fourth conversion unit 410; the two ends of the sixth capacitor C6 are respectively connected to the two input terminals of the fifth conversion unit 500, and the sixth capacitor C6 is used to filter the DC power input to the fifth conversion unit 500.

[0064] It is understandable that by setting capacitors on the DC side of the conversion module 100, the first conversion unit 200, the second conversion unit 320, the third conversion unit 330, the fourth conversion unit 410, and the fifth conversion unit 500, not only is the current filtered, but the capacitors can also quickly provide or absorb transient current, reduce voltage drops, thereby suppressing interference and improving circuit stability. Furthermore, the capacitors help maintain the stability of the input voltage, especially when the load changes, ensuring the normal operation of the DC-DC converter.

[0065] In summary, the power supply system provided in this application embodiment converts the three-phase AC power from the power grid 800 into DC power via the conversion module 100 and delivers it to the DC bus. The first power supply module 300 obtains power from the DC bus and charges the energy storage unit 340. When the DC bus needs power, the energy storage unit 340 can output power in reverse to supply power to the DC bus. The second power supply module 400 charges the energy storage unit 340 when needed and feeds power to the power grid 800 when needed. This power supply system uses a single conversion module 100, reducing the use of rectifier units, reducing current damage to the power supply system, and alleviating the burden on the power supply system.

[0066] like Figure 3 As shown in the embodiments of this application, a power supply system scheduling method is also provided, including:

[0067] S1: Determine that the voltage Vbus of the DC bus is within the first range value U1, and control the conversion module to convert the three-phase AC power of the power grid into DC power to supply power to the DC bus.

[0068] S2: Determine that the DC bus voltage Vbus is within the second range value U2, and control the energy storage unit and photovoltaic unit to supply power to the DC bus.

[0069] S3: Determine that the DC bus voltage Vbus is within the third range value U3, and control the energy storage unit, photovoltaic unit and conversion module to jointly supply power to the DC bus.

[0070] S4: Determine that the DC bus voltage Vbus is in the fourth range value U4, control the switch unit to open, and control the energy storage unit to supply power to the storage unit.

[0071] The first range value U1, the second range value U2, the third range value U3, and the fourth range value U4 satisfy the following conditions: 650V ≤ U1 ≤ 700V, 700V < U2 ≤ 750V, 750V < U3 ≤ 800V, and U4 < 650V or U4 > 800V. It is conceivable that there are other ways to divide the range between 650V and 800V, and multiple ranges can be defined. The number of different ranges and their specific values ​​can be selected according to the actual application scenario; this application will not exhaustively list them here.

[0072] The following is passed Figure 4 The following example illustrates the scheduling method of the power supply system. After startup, the voltage of the DC bus is first acquired. If the bus voltage is between 650V and 700V, a conversion module is used to control the DC bus voltage between 650V and 700V. If the power of the conversion module is detected to be greater than 3 times the rated power, or the power of the conversion module is between 1 times and 3 times the rated power and the overload time exceeds 10 seconds, or the input voltage of the conversion module is greater than 180Vac, the conversion module is shut down.

[0073] If the DC bus voltage is detected to be between 700V and 750V, and the power of the conversion module is in standby mode (i.e., power is 0), further detection is performed. If the DC bus voltage is greater than 725V, the third conversion unit is controlled to charge the energy storage unit through the DC bus. If the DC bus voltage is less than 725V, the third conversion unit is controlled to discharge to the DC bus through the energy storage unit. The energy storage unit can support a 5C discharge capability for 10 seconds. When the battery discharges to the discharge threshold of the storage unit, the third conversion unit is controlled to only charge and no longer discharge. When the DC bus voltage is greater than 700V, the fourth conversion unit is controlled based on MPPT (Maximum Power Point Tracking) to feed the electrical energy converted by the photovoltaic unit into the grid.

[0074] If the DC bus voltage is detected to be between 750V and 800V, the third conversion unit is controlled to charge the battery at maximum power. If the DC bus voltage is further detected to be greater than 775V, the conversion module is controlled to start the reverse mode to feed power to the grid.

[0075] If the voltage of the DC bus is detected to be less than 650V or greater than 800V, the control switch unit (Switch) is disconnected, and the storage unit draws power from the energy storage unit to operate until the battery is depleted.

[0076] In summary, the power supply system scheduling method provided in this application divides the DC bus voltage into different ranges and then performs different controls based on the DC bus voltage being in different ranges, thereby achieving reasonable scheduling of the power supply system, ensuring that each module or unit in the power supply system can work in coordination, and avoiding scheduling failures in the power supply system.

[0077] like Figure 5 As shown in the embodiments, this application also provides a power supply device, including: a power supply system as provided in any of the above embodiments. The functions and beneficial effects of the power supply system provided in this application have been described in the above embodiments, and will not be repeated here.

[0078] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A power supply system, characterized in that, include: The conversion module includes a DC terminal; A first power supply module is connected to the DC terminal. The first power supply module includes an energy storage unit, which is used to supply power to the drive unit and the power consumption unit. The second power supply module is connected to both the DC terminal and the energy storage unit.

2. The power supply system according to claim 1, characterized in that, The power supply system also includes: A first conversion unit has its input terminal connected to the DC terminal to obtain DC power, and its output terminal connected to the drive unit. The first conversion unit is used to convert the DC power into a three-phase current that matches the drive unit.

3. The power supply system according to claim 2, characterized in that, The first conversion unit includes a first DC-AC converter.

4. The power supply system according to claim 1, characterized in that, The first power supply module further includes a second conversion unit. The input terminal of the second conversion unit is connected to the DC terminal to obtain DC power. The output terminal of the second conversion unit is used to connect to a storage unit for storing data. The second conversion unit is used to convert the DC power into AC power that is compatible with the storage unit.

5. The power supply system according to claim 4, characterized in that, The first power supply module further includes a switching unit, which is connected between the second conversion unit and the conversion module.

6. The power supply system according to claim 5, characterized in that, The switching unit includes any one of a relay, a MOSFET, and an optocoupler.

7. The power supply system according to claim 5, characterized in that, The first power supply module further includes a third conversion unit, one end of which is connected to the energy storage unit and the other end of which is connected to the DC terminal. The third conversion unit is used to convert the DC power input and output of the energy storage unit.

8. The power supply system according to claim 7, characterized in that, The second conversion unit includes a second DC-AC converter, and the third conversion unit includes a bidirectional DC-DC converter.

9. The power supply system according to claim 1, characterized in that, The conversion module also includes a three-phase terminal for connecting to the power grid, and a DC terminal for connecting to the DC bus. Both the first power supply module and the second power supply module are connected to the DC bus.

10. The power supply system according to claim 9, characterized in that, The conversion module includes a bidirectional AC-DC converter; the second power supply module includes a photovoltaic unit, which is connected to the energy storage unit and the DC terminal respectively. The photovoltaic unit is used to charge the energy storage unit or to feed power to the grid through the bidirectional AC-DC converter.

11. The power supply system according to claim 10, characterized in that, The second power supply module also includes a fourth conversion unit, one end of which is connected to the photovoltaic unit and the other end of which is connected to the DC bus. The fourth conversion unit is used to convert the DC power output by the photovoltaic unit.

12. A power supply device, characterized in that, include: The power supply system as described in any one of claims 1-11.

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