High-voltage direct-current power supply system

Abstract

The invention provides a high-voltage direct-current power supply system, and relates to the technical field of high-voltage direct-current power supply. The system comprises a plurality of high-voltage DC conversion modules; each high-voltage DC conversion module comprises a battery pack and a plurality of high-voltage DC units connected with the battery pack; the input ends of the plurality of high-voltage direct-current units in each high-voltage direct-current conversion module are connected together to serve as the input end of the high-voltage direct-current conversion module, and the output ends are connected together to serve as the output end of the high-voltage direct-current conversion module; the input ends of the high-voltage direct-current conversion modules are connected with a power grid, and the output ends of the high-voltage direct-current conversion modules are connected with an external load and used for converting high-voltage alternating current input by the power grid into high-voltage direct current with a target voltage value so as to supply power to the load. According to the invention, flexible capacity expansion can be realized by adding the high-voltage direct-current conversion module, load power requirements of different scales can be met, and the flexibility and reliability of the system are improved.

Description

Technical Field

[0001] This invention relates to the field of high-voltage direct current power supply technology, and in particular to a high-voltage direct current power supply system. Background Technology

[0002] High-voltage direct current (HVDC) systems are a new type of uninterruptible power supply (UPS) system that provides efficient, reliable, and continuous power support for data centers, helping to improve data center performance and operational stability. The HVDC power module is the core of the HVDC system, using electronic power technology to convert AC power from the grid into DC output isolated from the grid, providing DC power to data center loads such as servers.

[0003] In related technologies, high-voltage direct current (HVDC) systems typically include multiple HVDC modules. The inputs of these modules are connected to the power grid, and their outputs are connected to a bus to supply power to the server load. To maintain stable output voltage, a battery is usually added to the bus. The voltage provided by the battery is matched to the output voltage of the multiple HVDC modules. When the system is normal, the multiple HVDC modules supply power to the load and also power the batteries. When the power grid fails and the HVDC modules cannot function properly, the batteries act as a backup power source to supply power to the server load through the bus, thereby ensuring the continuous operation of the data center and preventing downtime due to power outages.

[0004] However, with the rapid development of digital technology, especially artificial intelligence, the computing power requirements of data center servers are increasing, and the power supply required by server loads is also constantly rising. Therefore, when the load power increases, it is necessary to upgrade and transform the power supply system to improve its output power. However, based on the existing power supply system architecture, if you want to increase the output power, in addition to adjusting the output voltage of the HVDC module, you also need to replace the battery or expand its capacity. However, replacing the battery is costly, while expanding the capacity involves hardware replacement, which is difficult to implement, complex, and may temporarily affect the system's power supply. Therefore, the existing high-voltage DC system suffers from poor reliability and low flexibility. Summary of the Invention

[0005] This invention provides a high-voltage DC power supply system to solve the problem that existing high-voltage DC systems face high difficulty and cost in modification when the load power is increased, resulting in low system reliability and flexibility.

[0006] In a first aspect, embodiments of the present invention provide a high-voltage DC power supply system, comprising: a plurality of high-voltage DC conversion modules; Each high-voltage DC-DC converter module includes a battery pack and multiple high-voltage DC units connected to the battery pack; The input terminals of multiple high-voltage DC units in each high-voltage DC conversion module are connected together to serve as the input terminal of the high-voltage DC conversion module, and the output terminals are connected together to serve as the output terminal of the high-voltage DC conversion module. The input terminals of the multiple high-voltage DC conversion modules are all connected to the power grid, and the output terminals are all connected to external loads. They are used to convert the high-voltage AC power input from the power grid into high-voltage DC power of the target voltage value to supply power to the load.

[0007] In one possible implementation, the high-voltage DC unit includes: AC-DC module, used to convert high-voltage alternating current into first-voltage direct current; A first DC-DC module, connected to the AC-DC module, is used to stabilize the voltage of the first high-voltage DC power output by the AC-DC module at the target voltage value.

[0008] In one possible implementation, the positive output terminal of the AC-DC module is connected to the positive input terminal of the first DC-DC module via a first line, and the negative output terminal is connected to the negative input terminal of the first DC-DC module via a second line. The positive terminal of the battery pack is connected to the first line in each high-voltage DC unit of the high-voltage DC conversion module, and the negative terminal is connected to the second line in each high-voltage DC unit of the high-voltage DC conversion module.

[0009] In one possible implementation, each high-voltage DC-DC converter module further includes: a first diode; The anode of the first diode is connected to the positive terminal of the battery pack, and the cathode is connected to the positive output terminal of the high voltage DC-DC converter module. The negative terminal of the battery pack is connected to the negative output terminal of the high voltage DC-DC converter module.

[0010] The positive terminal of the battery pack is also connected to the first line in the first high voltage DC unit, and the negative terminal is also connected to the second line in the first high voltage DC unit. Wherein, the first high-voltage DC unit is any one of the high-voltage DC conversion modules; The first line is the connection line between the positive output terminal of the AC-DC module in the first high voltage DC unit and the positive input terminal of the first DC-DC module. The second line is the connection line between the negative output terminal of the AC-DC module in the first high-voltage DC unit and the negative input terminal of the first DC-DC module.

[0011] In one possible implementation, the high-voltage DC power supply system further includes a second DC-DC module disposed between the battery pack and the first and second lines within the high-voltage DC unit, for stabilizing the voltage on the first and second lines.

[0012] In one possible implementation, each high-voltage DC-DC converter module further includes: a third DC-DC module and a second diode; The battery pack is connected to the output terminal of the high-voltage DC-DC converter module via the third DC-DC module. The second diode is disposed on the positive output terminal of the high voltage DC conversion module, and its anode is connected to the positive output terminal.

[0013] In one possible implementation, the third DC-DC module is an isolated DC-DC module used to achieve electrical isolation.

[0014] In one possible implementation, the high-voltage DC power supply system further includes: a redundant high-voltage DC conversion module; The redundant high-voltage DC-DC converter module includes: a redundant battery pack and multiple redundant high-voltage DC units connected to the redundant battery pack; The input terminal of the redundant high-voltage direct current converter is connected to the power grid, and the output terminal is connected to an external load. It is used to supply power to the load when any one of the multiple high-voltage direct current converters fails.

[0015] In one possible implementation, the high-voltage DC power supply system further includes: a phase-shifting transformer; The phase-shifting transformer includes a primary circuit and multiple secondary circuits. The input terminal of the primary circuit is connected to the power grid, and the output terminal of each secondary circuit is connected to the input terminal of a high-voltage DC-DC converter module. The phase-shifting transformer is used to convert high-voltage AC power into multiple AC power sources with different phases in order to suppress harmonics.

[0016] In one possible implementation, the target voltage value is 240V or 750V.

[0017] This invention provides a high-voltage direct current (HVDC) power supply system that employs multiple HVDC conversion modules. Each HVDC conversion module includes a battery pack and multiple HVDC units connected to the battery pack. The input terminals of the multiple HVDC units in each HVDC conversion module are connected together as the module's input terminal, and the output terminals are connected together as the module's output terminal. The input terminals of all multiple HVDC conversion modules are connected to the power grid, and the output terminals are all connected to an external load. This system converts the high-voltage AC power input from the power grid into high-voltage DC power at a target voltage value to supply power to the load. This application constructs a distributed, modular power supply architecture. This multi-module parallel design, with each module equipped with a battery pack, provides a unique power supply system. This allows for flexible expansion of the entire system's power supply capacity by adding high-voltage DC-DC converter modules, adapting to the power requirements of different load sizes (such as different numbers of servers in a data center). Compared to the traditional architecture where batteries are directly connected to the bus, there is no need to replace or modify the batteries, saving the cost of battery replacement or modification and greatly improving the flexibility of system expansion. Furthermore, when a single battery pack or a single high-voltage DC-DC converter module fails, other modules and battery packs can still operate normally. Compared to the situation where a traditional battery failure may lead to an abnormal power supply to the entire system, this avoids the problem of system power outages caused by local single-point failures, significantly improving system reliability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a conventional high-voltage direct current system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a high-voltage DC power supply system provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention; Figure 10This is a schematic diagram of the structure of a high-voltage DC power supply system provided in another embodiment of the present invention; Figure 11 This is a schematic diagram of a high-voltage DC power supply system provided in another embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0020] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0021] like Figure 1 As shown, a traditional high-voltage direct current (HVDC) system typically includes multiple HVDC modules. The inputs of these modules are connected to the power grid, and their outputs are connected to a bus, which supplies power to the server loads in the data center. To maintain stable output voltage, a battery is usually added to the bus. The voltage provided by the battery matches the output voltage of the multiple HVDC modules. When the system is normal, the multiple HVDC modules supply power to the loads and also power the batteries. When the power grid fails and the HVDC modules cannot function properly, the batteries act as a backup power source, supplying power to the server loads through the bus, thus ensuring continuous operation of the data center and preventing downtime due to power outages.

[0022] However, with the rapid development of digital technology, especially artificial intelligence, the computing power requirements of data center servers are increasing, and the power supply required by server loads is also constantly rising. Therefore, facing the significant increase in load power, technicians need to upgrade and transform the power supply system to improve its output power. There are generally two ways to increase output power: one is to keep the output voltage constant and increase the output current of the HVDC module. However, for data center power supply systems, the hardware and wiring are designed based on the original load power. Given this design, the current tolerance of each HVDC module's wiring is limited. For example, if the original server load required a lower power, each HVDC module's wiring was designed to withstand 30-40A. When the server load's power requirement doubles, to increase the current to 60-80A while keeping the HVDC module's output voltage constant, the entire HVDC hardware and wiring need to be completely redesigned to improve its tolerance. This modification is costly and complex. Another common method to increase output power is to keep the output current constant while increasing the output voltage, for example, from 240V to 700V. HVDC itself has voltage regulation capabilities, and control strategies can be used to increase the output voltage as needed to meet the increased load power requirements. However, with a significant increase in HVDC output voltage, the output voltage of the battery connected to the bus also needs to increase to match the HVDC output voltage; otherwise, the battery will be damaged. Therefore, it is necessary to replace the battery with a larger capacity one or to upgrade the battery capacity. However, replacing the battery is costly, and upgrading the battery capacity involves hardware replacement, rewiring, etc., making the upgrade difficult, complex to implement, and potentially causing a temporary disruption to the system power supply. Furthermore, in the existing high-voltage DC architecture, a single point of failure in the battery can lead to a power supply failure for the entire system. Therefore, existing high-voltage DC systems suffer from poor reliability and low flexibility.

[0023] To address the aforementioned technical deficiencies, this application proposes the following technical concept: The HVDC units in existing high-voltage direct current (HVDC) systems are grouped, with each group serving as a high-voltage direct current conversion module comprising multiple HVDC units. Simultaneously, the batteries are also divided into multiple groups, with each HVDC conversion module equipped with one set of batteries (for example, dividing 12 HVDC units into 4 groups, each module comprising 3 HVDC units, and dividing the batteries into 4 groups, with each module equipped with one set of batteries). That is, the entire high-voltage direct current power supply system comprises multiple high-voltage direct current conversion modules, and each high-voltage direct current conversion module includes a battery pack and multiple high-voltage direct current units connected to the battery pack. The input terminals of multiple high-voltage direct current units in each high-voltage direct current conversion module are connected together as the module's input terminal, and the output terminals are connected together as the module's output terminal. Furthermore, the input terminals of multiple high-voltage direct current conversion modules are all connected to the power grid, and the output terminals are all connected to external loads, thus forming a distributed, modular power supply architecture. When the server load increases power, it is only necessary to control the HVDC unit in each high-voltage DC-DC converter module to increase the output voltage through the control strategy. When the server load increases power significantly (for example, from 240V to 750V), in order to improve the overall backup power capacity of the system, high-voltage DC-DC converter modules can be added to achieve flexible capacity expansion without replacing or modifying the batteries, thus improving the flexibility of system expansion.

[0024] The implementation of the present invention will be described in detail below with reference to the accompanying drawings: Figure 2 This is a schematic diagram of the structure of a high-voltage DC power supply system provided in an embodiment of the present invention.

[0025] like Figure 2 As shown, the system provided in this embodiment includes: multiple high-voltage direct current conversion modules (high-voltage direct current conversion module 1, ..., high-voltage direct current conversion module n); each high-voltage direct current conversion module includes a battery pack and multiple high-voltage direct current units (HVDC-1, ..., HVDC-m) connected to the battery pack; the input terminals of the multiple high-voltage direct current units in each high-voltage direct current conversion module are connected together to serve as the input terminal of the high-voltage direct current conversion module, and the output terminals are connected together to serve as the output terminal of the high-voltage direct current conversion module; the input terminals of the multiple high-voltage direct current conversion modules are all connected to the power grid, and the output terminals are all connected to an external load, for converting the high-voltage alternating current input from the power grid into high-voltage direct current of a target voltage value to supply power to the load.

[0026] In one possible implementation, such as Figure 2 As shown, the number n of high voltage DC conversion modules in the system can be determined according to the power required by the data center servers (such as server 1, server 2, server 3, etc.) in the actual situation. The number m of HVDC units contained in each high voltage DC conversion module can be designed according to the actual situation. For example, m can be 2, 3 or 4, etc.

[0027] For example, suppose the original data center server requires an output voltage of 240V, necessitating six high-voltage direct current (HVDC) converter modules. Each HVDC converter module contains two HVDC units and a battery pack, with each battery pack containing 10 batteries. When the power grid fails, the battery packs continue to power the server load, ensuring backup power for a period of time (e.g., 15 minutes), allowing the server load to operate continuously without interruption. When the power required by the server load increases significantly, the original six HVDC converter modules cannot meet the power demand, and the six battery packs within the original six HVDC converter modules also cannot provide backup power for the same period (e.g., 15 minutes) when the power grid fails. Therefore, several identical HVDC converter modules can be added in parallel to the original system. The addition of HVDC converter modules increases the current on the bus, thereby increasing the system output power. Furthermore, since each HVDC converter module contains a battery pack, it can also meet the system's requirements for battery backup power.

[0028] In this embodiment, a distributed, modular power supply architecture is constructed. This multi-module parallel design, with each module equipped with a battery pack, allows the power supply capacity of the entire system to be flexibly expanded by adding high-voltage DC-DC conversion modules. It can adapt to the power requirements of different scale loads (such as different numbers of servers in a data center). Compared with the traditional architecture where batteries are directly connected to the bus, there is no need to replace or modify the batteries, saving the cost of replacing or modifying batteries and greatly improving the flexibility of system expansion. Furthermore, when a single battery pack or a single high-voltage DC-DC conversion module fails, other modules and battery packs can still work normally. Compared with the situation where a traditional battery failure may cause an overall power supply abnormality, this avoids the problem of system power outage due to a local single point of failure, and greatly improves system reliability.

[0029] It should be noted that HVDC has its own voltage regulation capability. Through control strategies, HVDC can increase its output voltage as needed to meet the requirements of increased load power. For example, adjusting the duty cycle of its pulse width modulation (PWM) signal can change the DC output power.

[0030] Figure 3 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in an embodiment of the present invention.

[0031] In one possible implementation, such as Figure 3 As shown, the high voltage direct current unit (HVDC) includes: an AC-DC module for converting high voltage alternating current into a first high voltage direct current; and a first DC-DC module connected to the AC-DC module for stabilizing the voltage of the first high voltage direct current output by the AC-DC module at the target voltage value.

[0032] It should be noted that the AC-DC module is an AC-DC converter, and the DC-DC module is a DC-DC converter. Because the voltage conversion of the first-stage AC-DC is unstable, the output voltage of the HVDC unit may fluctuate during the charging and discharging process of the battery pack, making it difficult to achieve the stable voltage accuracy required by the data center. Therefore, a second-stage DC-DC module (i.e., the first DC-DC module) is needed to stabilize the output voltage of the HVDC unit at the target voltage value (such as 240V or 750V).

[0033] In this embodiment, in the high-voltage DC unit, the AC-DC converter first converts the high-voltage alternating current into a first high-voltage direct current, and then the first DC-DC converter stabilizes it to the target voltage. Referring to Figure 3, the hierarchical processing of AC-DC and DC-DC converters allows for the initial conversion from AC to DC, followed by fine adjustment of the output voltage to ensure greater stability and adaptability to the voltage accuracy requirements of the load (such as data center servers requiring stable voltage for operation).

[0034] In one possible implementation, such as Figure 3 As shown, the AC-DC module has a positive output terminal and a negative output terminal, and the first DC-DC module has a positive input terminal and a negative input terminal. The positive output terminal of the AC-DC module is connected to the positive input terminal of the first DC-DC module through a first line, and the negative output terminal is connected to the negative input terminal of the first DC-DC module through a second line. The positive terminal of the battery pack is connected to the first line in each high-voltage DC unit of the high-voltage DC conversion module, and the negative terminal is connected to the second line in each high-voltage DC unit of the high-voltage DC conversion module.

[0035] In this embodiment, when the power grid is normal, each high-voltage DC-DC converter module supplies power to the server load and charges the battery pack at the same time; when the power grid fails, the battery pack continues to supply power to the server load through the first DC-DC converter in each HVDC unit within the module, and uses the first DC-DC converter built into the HVDC to provide a stable and reliable output voltage to the server.

[0036] It should be noted that this embodiment uses a high-voltage direct current conversion module containing two HVDC units (HVDC-1 and HVDC-2) as an example to describe the architecture of the high-voltage direct current conversion module. In actual scenarios, a high-voltage direct current conversion module may also include 3, 4 or more HVDC units, and their connection architecture is similar, which will not be described in detail here.

[0037] In this embodiment of the application, the positive and negative terminals of the battery pack are connected to the AC-DC to the first DC-DC line in each high-voltage DC unit (corresponding to...). Figure 3The battery pack is connected to the internal circuits of HVDC-1 and HVDC-2, enabling it to directly participate in the power regulation of the HVDC units. In the event of a power outage or voltage fluctuation, the battery pack can respond quickly, replenishing or stabilizing power through these connections, thus improving the continuity and stability of the system's power supply. Furthermore, multiple HVDC units share the battery pack connection, allowing for flexible energy distribution among the units within the module. This fully utilizes the battery pack's energy storage, optimizes the allocation of power resources within the module, and enhances the module's ability to cope with load changes or grid anomalies.

[0038] It is understood that the HVDC unit includes power modules such as AC-DC and DC-DC converters. The AC-DC converter can be a three-phase active power factor correction (PFC) converter. PFC improves the power factor of the power grid and reduces harmonic pollution by actively managing the input current waveform. In addition, the HVDC unit also includes auxiliary power supply, input / output detection and protection circuits, drive control circuits, and communication circuits. In this embodiment, in order to clearly show the connection relationship between the battery pack and the HVDC unit, the connection of other modules is not described in detail. For the detailed internal structure of the HVDC, please refer to relevant technologies, which will not be described in detail here.

[0039] Figure 4 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention.

[0040] In one possible implementation, such as Figure 4 As shown, in Figure 3 Based on the structure of the high voltage DC-DC converter module shown, a second DC-DC module can be added to each HVDC unit. The battery pack is then connected to the first and second lines of the HVDC unit through the second DC-DC module of each HVDC unit.

[0041] It should be noted that if the battery pack in the high voltage DC-DC converter module is directly connected to the line between the AC-DC and the first DC-DC module in the HVDC unit, fluctuations in the battery pack voltage (such as voltage changes during charging and discharging) will directly affect the voltage of the subsequent circuits, which may lead to unstable input voltage of the first DC-DC module, thereby affecting the accuracy of the output voltage to the load.

[0042] In this embodiment, the second DC-DC module (reference) Figure 4The second DC-DC converter can actively stabilize the voltage of the internal circuits (i.e., the first and second lines) of the HVDC unit. When the battery pack is charging or discharging, the mains voltage fluctuates, or the internal switching of the unit causes changes in the line voltage, the second DC-DC converter can adjust in real time to make the voltage input to the HVDC unit and subsequent output more stable, avoiding the impact of voltage fluctuations on the load (such as server failure due to voltage instability). Each HVDC unit is equipped with a second DC-DC module, which can precisely adjust the input and output voltage of the unit, thereby improving the accuracy and stability of the output voltage of each HVDC unit. Furthermore, the second DC-DC converter can flexibly adjust the voltage according to the characteristics of different battery packs (such as batteries with different voltages and capacities) and load requirements, reducing the matching requirements of the battery pack output voltage and improving the system's compatibility with different batteries and loads.

[0043] Figure 5 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention.

[0044] In one possible implementation, such as Figure 5 As shown, the high-voltage direct current conversion module also includes a second DC-DC module. The battery pack is connected to the AC-DC to first DC-DC line in each HVDC unit of the high-voltage direct current conversion module through this second DC-DC module (corresponding to...). Figure 5 The battery pack is connected to the internal wiring of HVDC-1 and HVDC-2.

[0045] In this embodiment, when the server load power increases significantly, in order to match the system output power with the load, the output power can be increased by increasing the HVDC output voltage. Under high power load, when the system output voltage reaches 750V, the voltage on the line between the two-stage converters (i.e., between AC-DC and the first DC-DC) inside the HVDC unit will also be high (possibly above 500V), while the battery pack output voltage may be low (e.g., 192V), which does not match the voltage on the internal line. Therefore, a second DC-DC module can be added to raise the battery pack output voltage to reduce the matching requirements of the battery output voltage.

[0046] Figure 6 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention.

[0047] In one possible implementation, such as Figure 6As shown, each high-voltage direct current converter module further includes: a first diode; the anode of the first diode is connected to the positive terminal of the battery pack, and the cathode is connected to the positive output terminal of the high-voltage direct current converter module; the negative terminal of the battery pack is connected to the negative output terminal of the high-voltage direct current converter module; the positive terminal of the battery pack is also connected to a first line within the first high-voltage direct current unit, and the negative terminal is also connected to a second line within the first high-voltage direct current unit; wherein, the first high-voltage direct current unit is any one of the high-voltage direct current converter modules; the first line is the connection line between the positive output terminal of the AC-DC module and the positive input terminal of the first DC-DC module within the first high-voltage direct current unit; the second line is the connection line between the negative output terminal of the AC-DC module and the negative input terminal of the first DC-DC module within the first high-voltage direct current unit.

[0048] In this embodiment, when the power grid is normal, the high-voltage DC-DC converter module and its internal HVDC unit supply power to the server load normally, while the battery pack is charged via AC-DC conversion within the HVDC unit. When the power grid fails, the battery pack can directly supply power to the load through the circuit containing the first diode. Each stage of the conversion process incurs losses for the battery. Because of the diode circuit, the battery pack's discharge process does not need to pass through the first DC-DC module within the HVDC unit, thus reducing battery losses. Furthermore, since the power grid operates normally most of the time and power outages are rare, the charging power requirement for the battery is not high. Therefore, it is not necessary for each HVDC unit to be connected to the battery pack; the battery pack only needs to be connected to any one of the HVDC units within the high-voltage DC-DC converter module, thereby simplifying the circuit.

[0049] In one possible implementation, the high-voltage direct current conversion module further includes a second DC-DC module disposed between the battery pack and the first and second lines within the high-voltage direct current unit, for stabilizing the voltage on the first and second lines.

[0050] like Figure 7 As shown, in Figure 6 Based on the high-voltage direct current conversion module structure shown, an HVDC unit (such as...) connected to the battery pack can be added. Figure 7 A second DC-DC module is added to the HVDC-1 unit connected to the battery pack. The battery is connected to the internal circuitry of the HVDC unit (i.e., the first and second lines between the AC-DC and the first DC-DC) via this second DC-DC module. When the system is normal, each HVDC unit supplies power to the load. At the same time, the HVDC unit (HVDC-1) connected to the battery pack charges the battery via the second DC-DC module. When the high-voltage DC-DC converter module or any of the HVDC units fails, the battery pack can directly supply power to the load through a diode circuit.

[0051] In this embodiment, the second DC-DC module (reference) Figure 7 This second DC-DC converter is positioned between the battery pack and the two-stage converter within the HVDC unit, actively stabilizing the line voltage. When the battery pack charges or discharges, the mains voltage fluctuates, or internal unit switching causes line voltage changes, the second DC-DC converter can adjust in real time, ensuring a more stable voltage input to the HVDC unit and subsequent outputs, preventing voltage fluctuations from affecting the load (such as server malfunctions due to voltage instability). Furthermore, it can flexibly adjust the voltage according to different battery pack characteristics (such as batteries with different voltages and capacities) and load requirements, reducing the matching requirements of the battery pack output voltage and improving the system's compatibility with different batteries and loads.

[0052] It should be noted that, in Figure 6 and Figure 7 In the illustrated embodiment, the connection relationship between the battery pack and the HVDC unit is explained by taking the example of a high-voltage direct current conversion module containing two HVDC units (HVDC-1 and HVDC-2) and the battery pack being connected to the internal circuit of HVDC-1 (i.e., the first circuit and the second circuit). In actual scenarios, the high-voltage direct current conversion module may also include multiple HVDC units, and the battery pack may be connected to the internal circuit of any one of the HVDC units, or it may be connected to all the HVDC units in the module.

[0053] Figure 8 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention.

[0054] In one possible implementation, to improve the power supply reliability and stability of the line where each HVDC unit is located, in Figure 7 Based on the high-voltage direct current conversion module structure shown, the battery pack can establish connection lines with each HVDC unit within the high-voltage direct current conversion module. For example... Figure 8 As shown, each HVDC unit within the high-voltage direct current converter module has an additional second DC-DC module. The battery pack is connected to the first and second lines of the HVDC unit via the second DC-DC module of each HVDC unit. During normal system operation, each HVDC unit within each high-voltage direct current converter module supplies power to the load and simultaneously charges the battery pack. If any HVDC unit within the module fails, the other HVDC units can continue to charge the battery pack. In the event of a grid fault or an internal module fault, the battery pack can directly supply power to the load via the diode (D1) circuit.

[0055] exist Figures 6-8In the illustrated embodiment, the battery pack and the first diode D1 form a separate power supply circuit. When the power grid is normal, the HVDC unit can charge the battery pack through the line. When the power grid is abnormal, the battery pack directly supplies the load through the first diode D1 and quickly discharges to the output terminal of the high voltage DC conversion module, which improves the emergency power supply response speed of the system and ensures uninterrupted and stable power supply to the data center server load. In addition, the diode can prevent reverse current, ensure the safe and efficient switching of battery pack charging and discharging, and further improve the reliability and stability of the system.

[0056] It should be noted that, in Figures 3-8 The structural diagrams of the high-voltage direct current converter modules shown are all illustrated using the example of a module containing two HVDC units. In actual application scenarios, each module can also include more HVDC units, and their connection relationships are similar, which will not be described in detail here.

[0057] Figure 9 This is a schematic diagram of the structure of a high-voltage DC conversion module provided in another embodiment of the present invention.

[0058] In one possible implementation, such as Figure 9 As shown, each high-voltage DC-DC converter module also includes: a third DC-DC module; the battery pack is connected to the output terminal of the high-voltage DC-DC converter module via the third DC-DC module.

[0059] In this embodiment, the battery pack is connected to a third DC-DC module (reference). Figure 9 Connected to the output of the high-voltage DC-DC converter module, it can flexibly convert the battery pack voltage to a suitable value according to the actual load requirements. Regardless of the battery pack voltage, it can be precisely adjusted via a third DC-DC converter before being connected to the bus, ensuring that the output voltage is stable at the target voltage value, adapting to loads with different voltage requirements, and improving the module's adaptability to diverse loads. Furthermore, the connection between the battery pack and the output is independently controlled via the third DC-DC converter, and the battery pack discharge no longer passes through the HVDC unit, making the battery pack charging and discharging strategy more flexible. The battery pack power output can be optimized individually according to the battery status and load requirements, ensuring power supply to the load while facilitating battery pack management (such as reasonable charging and discharging to extend lifespan).

[0060] In one possible implementation, such as Figure 9 As shown, the high-voltage DC conversion module also includes a second diode, the anode of which is connected to the positive output terminal of the high-voltage DC output module, and the cathode of which is used to connect to the load of the downstream data center.

[0061] By setting up diodes, the battery pack can only supply power to itself, ensuring that the power supply between the high-voltage DC-DC conversion modules does not interfere with each other.

[0062] In one possible implementation, such as Figure 9 As shown, the third DC-DC module is an isolated DC-DC module used to achieve electrical isolation.

[0063] Specifically, in scenarios where the battery pack is connected to the output of the high-voltage DC-DC converter module, since the outputs of multiple high-voltage DC-DC converter modules are directly connected to the bus, it is equivalent to multiple battery packs being directly connected to the bus. When one module fails, it is easy to crosstalk to the battery packs of other modules. Therefore, the third DC-DC module can be an isolated DC-DC module.

[0064] In this embodiment, the third DC-DC converter is an isolation type, which can achieve electrical isolation between the battery pack and the module output. This prevents battery pack-side faults (such as leakage or short circuits) from being conducted to the load side, and also avoids load-side or other module faults from interfering with the battery pack, thus improving system safety and electromagnetic compatibility. Furthermore, the isolation function cuts off the fault propagation path. When an abnormality occurs in the battery pack or load side, the isolation module can effectively block it, reduce the scope of the fault's impact, and enhance the overall system reliability and fault resistance.

[0065] It should be noted that, Figures 3-9 This is a schematic diagram of the architecture of seven high-voltage DC conversion modules. In practical application scenarios, any one or more of them can be selected and connected in parallel to form a high-voltage DC power supply system according to actual needs. Figure 2 , Figure 10 and Figure 11 The high-voltage DC power supply module in the high-voltage DC power supply system shown can be replaced with Figures 3-9 Any one or more of the following, which will not be described in detail here.

[0066] In one possible implementation, the high-voltage DC power supply system further includes: a redundant high-voltage DC conversion module; the redundant high-voltage DC conversion module includes: a redundant battery pack and a plurality of redundant high-voltage DC units connected to the redundant battery pack; the input end of the redundant high-voltage DC conversion module is connected to the power grid, and the output end is connected to an external load, for supplying power to the load when any one of the plurality of high-voltage DC conversion modules fails.

[0067] For example, such as Figure 10 The diagram shows an n+1 type redundant power supply architecture, taking an example where each high-voltage DC-DC converter module contains two HVDC units (HVDC-A and HVDC-2) and one battery pack (see reference). Figure 8The high-voltage direct current (HVDC) converter module shown has its positive output terminals of two HVDC units connected together as the positive output terminal of the HVDC converter module, and its negative output terminals of two HVDC units connected together as the negative output terminal of the HVDC converter module. All positive output terminals of all HVDC converter modules are connected to the positive input terminal of the bus, and all negative output terminals are connected to the negative input terminal of the bus. All input terminals of all HVDC converter modules are connected to the power grid. Under normal circumstances, HVDC converter modules 1 through 1 (n) are used as the primary power supply modules to power the data center server, and the redundant HVDC power supply modules do not operate. When any one of the primary modules (1 through 1) fails, the redundant HVDC power supply module takes over the power supply.

[0068] In this embodiment, the redundant high-voltage DC-DC converter module can immediately take over power supply when the original module fails (similar to...). Figure 2 (Multi-module parallel extended redundancy design). When the primary high-voltage DC-DC converter module fails, the redundant high-voltage DC-DC converter modules quickly supply power to the load through independent redundant battery packs and high-voltage DC units, ensuring continuous operation of the load and solving the problems of traditional architectures (such as...). Figure 1 This addresses the issues of lack of redundancy and significant impact from failures, improving system high availability and meeting the uninterrupted power supply requirements of critical loads (such as core servers in data centers). Furthermore, when the primary high-voltage DC-DC converter module fails, it can be repaired and replaced offline, while redundant high-voltage DC-DC converter modules maintain power supply without affecting normal load operation, reducing system maintenance interference with business operations and improving operational flexibility and efficiency.

[0069] It should be noted that the structure of the high-voltage DC conversion module in this embodiment can be... Figures 3 to 9 Any of the structures shown.

[0070] Figure 11 This is a schematic diagram of a high-voltage DC power supply system provided in another embodiment of the present invention.

[0071] In one possible implementation, the high-voltage direct current power supply system further includes a phase-shifting transformer; the phase-shifting transformer includes a primary circuit and multiple secondary circuits, the input terminal of the primary circuit is connected to the power grid, and the output terminal of each secondary circuit is connected to the input terminal of a high-voltage direct current conversion module; the phase-shifting transformer is used to convert high-voltage alternating current into multiple alternating currents with different phases to suppress harmonics.

[0072] In this embodiment, a phase-shifting transformer converts the AC power from the grid into multiple AC power sources with different phases, which are then input to various high-voltage direct current (HVDC) conversion modules. After conversion by the modules, the harmonics of the different phase AC power sources can cancel each other out. Compared with traditional HVDC systems without phase-shifting transformers, this significantly reduces harmonic content, improves output power quality, reduces harmonic damage to the grid and load equipment, and ensures long-term stable operation of the system.

[0073] In one possible implementation, the target voltage of the high-voltage DC output from the high-voltage DC conversion module is 240V or 750V.

[0074] In this embodiment, the target voltage value is set to 240V or 750V. 240V can be adapted to some medium and low voltage DC load scenarios (such as specific data center equipment), while 750V is suitable for high voltage demand scenarios such as high voltage DC transmission and large data centers. This allows the system to accurately match the voltage requirements of different industries and loads of different sizes, and can be directly applied without additional complex voltage regulation, thereby improving the system's versatility and ease of deployment.

[0075] It is understood that the specific implementation methods and functions of each module / unit in the above different embodiments can be referenced from each other.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage DC power supply system, characterized in that, include: Multiple high-voltage DC conversion modules; Each high-voltage DC-DC converter module includes a battery pack and multiple high-voltage DC units connected to the battery pack; The input terminals of multiple high-voltage DC units in each high-voltage DC conversion module are connected together to serve as the input terminal of the high-voltage DC conversion module, and the output terminals are connected together to serve as the output terminal of the high-voltage DC conversion module. The input terminals of the multiple high-voltage DC conversion modules are all connected to the power grid, and the output terminals are all connected to external loads. They are used to convert the high-voltage AC power input from the power grid into high-voltage DC power of the target voltage value to supply power to the load.

2. The high-voltage DC power supply system as described in claim 1, characterized in that, The high-voltage DC unit includes: AC-DC module, used to convert high-voltage alternating current into first high-voltage direct current; A first DC-DC module, connected to the AC-DC module, is used to stabilize the voltage of the first high-voltage DC power output by the AC-DC module at the target voltage value.

3. The high-voltage DC power supply system as described in claim 2, characterized in that, The positive output terminal of the AC-DC module is connected to the positive input terminal of the first DC-DC module through a first line, and the negative output terminal is connected to the negative input terminal of the first DC-DC module through a second line. The positive terminal of the battery pack is connected to the first line in each high-voltage DC unit of the high-voltage DC conversion module, and the negative terminal is connected to the second line in each high-voltage DC unit of the high-voltage DC conversion module.

4. The high-voltage DC power supply system as described in claim 2, characterized in that, Each high-voltage DC-DC converter module also includes: a first diode; The anode of the first diode is connected to the positive terminal of the battery pack, and the cathode is connected to the positive output terminal of the high voltage DC-DC converter module. The negative terminal of the battery pack is connected to the negative output terminal of the high voltage DC-DC converter module; The positive terminal of the battery pack is also connected to the first line in the first high voltage DC unit, and the negative terminal is also connected to the second line in the first high voltage DC unit. Wherein, the first high-voltage DC unit is any one of the high-voltage DC conversion modules; The first line is the connection line between the positive output terminal of the AC-DC module in the first high voltage DC unit and the positive input terminal of the first DC-DC module. The second line is the connection line between the negative output terminal of the AC-DC module in the first high-voltage DC unit and the negative input terminal of the first DC-DC module.

5. The high-voltage DC power supply system as described in claim 4, characterized in that, Also includes: The second DC-DC module is disposed between the battery pack and the first and second lines in the high-voltage DC unit, and is used to stabilize the voltage on the first and second lines.

6. The high-voltage DC power supply system as described in claim 1, characterized in that, Each high-voltage DC-DC converter module also includes: a third DC-DC module and a second diode; The battery pack is connected to the output terminal of the high-voltage DC-DC converter module via the third DC-DC module. The second diode is disposed on the positive output terminal of the high voltage DC conversion module, and its anode is connected to the positive output terminal.

7. The high-voltage DC power supply system as described in claim 6, characterized in that, The third DC-DC module is an isolated DC-DC module used to achieve electrical isolation.

8. The high-voltage DC power supply system as described in claim 1, characterized in that, It also includes: redundant high-voltage DC-DC converter modules; The redundant high-voltage DC-DC converter module includes: a redundant battery pack and multiple redundant high-voltage DC units connected to the redundant battery pack; The input terminal of the redundant high-voltage direct current converter is connected to the power grid, and the output terminal is connected to an external load. It is used to supply power to the load when any one of the multiple high-voltage direct current converters fails.

9. The high-voltage DC power supply system as described in any one of claims 1 to 8, characterized in that, Also includes: Phase-shifting transformer; The phase-shifting transformer includes a primary circuit and multiple secondary circuits. The input terminal of the primary circuit is connected to the power grid, and the output terminal of each secondary circuit is connected to the input terminal of a high-voltage DC-DC converter module. The phase-shifting transformer is used to convert high-voltage AC power into multiple AC power sources with different phases in order to suppress harmonics.

10. The high-voltage DC power supply system as described in any one of claims 1 to 8, characterized in that, The target voltage value is 240V or 750V.

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