DC power supply system and data center using same

Abstract

The invention provides a direct-current power supply system and a data center using the direct-current power supply system, relates to the technical field of intelligent power grids, and particularly relates to the technical fields of data center power supply, transformer technologies, direct-current power supplies and the like. The direct-current power supply system comprises a transformer, the input end of the transformer is connected with commercial power, the transformer is used for converting initial alternating-current voltage provided by the commercial power into target alternating-current voltage, and the ratio of the initial alternating-current voltage to the target alternating-current voltage is smaller than 21; the input end of the alternating-current power distribution module is connected with the output end of the transformer, and the alternating-current power distribution module is used for distributing the target alternating-current voltage output by the transformer; the input ends of the plurality of rectification modules are respectively connected with the output end of the alternating-current power distribution module, the output ends of the plurality of rectification modules are respectively connected with load equipment, and the plurality of rectification modules are used for converting the alternating-current voltage distributed by the alternating-current power distribution module into direct-current voltage and providing the direct-current voltage for the load equipment. The power supply capability and efficiency of the DC power supply system can be improved, and the line loss can be reduced.

Description

Technical Field

[0001] This disclosure relates to the field of smart grid technology, specifically to the fields of data center power supply, transformer technology, DC power supply, etc., and particularly to a DC power supply system and a data center using the DC power supply system. Background Technology

[0002] Currently, the DC power systems used in data centers have low transformer output voltage levels, which limits the power supply capacity and efficiency of the DC power systems. Furthermore, the line losses are high for the same capacity, which is not conducive to the energy-saving operation of DC power systems and makes the cost of DC power systems high. Summary of the Invention

[0003] This disclosure provides a DC power supply system and a data center using the DC power supply system, which can improve the power supply capacity and efficiency of the DC power supply system and reduce line losses.

[0004] In a first aspect, embodiments of this disclosure propose a DC power supply system, comprising: a transformer, the input terminal of which is connected to mains power, for converting an initial AC voltage provided by the mains power into a target AC voltage, wherein the ratio of the initial AC voltage to the target AC voltage is less than 2:1; an AC distribution module, the input terminal of which is connected to the output terminal of the transformer, for distributing the target AC voltage output by the transformer; and a plurality of rectifier modules, the input terminals of which are respectively connected to the output terminals of the AC distribution module, and the output terminals of which are respectively connected to load devices, for converting the AC voltage distributed by the AC distribution module into a DC voltage and providing the DC voltage to the load devices.

[0005] Secondly, embodiments of this disclosure provide a data center, including: a load device and the DC power supply system described in the first aspect, the DC power supply system being used to provide DC voltage to the load device.

[0006] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0007] Other features, objects, and advantages of this disclosure will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is an exemplary system architecture diagram to which this disclosure can be applied; Figure 2This is a schematic diagram of a DC power supply system according to some embodiments of the present disclosure; Figure 3 This is a schematic diagram of a transformer in a DC power supply system according to some embodiments of the present disclosure. Detailed Implementation

[0008] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding; these should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description. It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0009] The collection, storage, use, processing, transmission, provision, and disclosure of user personal information involved in the technical solution disclosed herein comply with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0010] Figure 1 An exemplary system architecture 100 is shown that can be applied to an embodiment of the DC power supply system disclosed herein.

[0011] like Figure 1 As shown, the system architecture 100 may include mains power 110, power supply system 120, and load device 130. Among them, mains power 110 is an AC power source, and power supply system 120 converts the electrical energy provided by mains power 110 and then supplies it to load device 130.

[0012] The load device 130 can be an electronic device such as a server, network device, or storage device in a data center. The power for the operation of the load device 130 is provided by the power supply system 120.

[0013] The power supply system 120 may include a power conversion device 121, which is a device for converting mains power 110, such as a transformer or rectifier module. The power conversion device 121 can convert mains power 110 into power that is compatible with the load device 130, such as converting AC power to DC power.

[0014] The power supply system 120 may also include a backup power source 122, such as a battery. The battery may be connected to the load device 130 and may provide power to the load device 130 in the event of a failure of the mains power 110 or the power conversion device 121. Here, the battery may be specifically implemented as a single battery cell or a battery pack.

[0015] It should be understood that Figure 1The number of power supply systems, load devices, power conversion devices, and backup power supplies shown is merely illustrative. Depending on implementation needs, any number of power supply systems, load devices, power conversion devices, and backup power supplies can be included.

[0016] Figure 2 This is a schematic diagram of a DC power supply system according to some embodiments of the present disclosure, such as... Figure 2 As shown, the DC power supply system 200 of this disclosure may include: a transformer 210, an AC power distribution module 220, and multiple rectifier modules 230. The input terminal 211 of the transformer 210 is connected to the mains power supply to convert an initial AC voltage provided by the mains power supply into a target AC voltage, wherein the ratio of the initial AC voltage to the target AC voltage is less than 2:1. The input terminal 221 of the AC power distribution module 220 is connected to the output terminal 212 of the transformer 210 to distribute the target AC voltage output by the transformer 210. The input terminals 231 of the multiple rectifier modules 230 are respectively connected to the output terminals 222 of the AC power distribution module 220, and the output terminals 232 of the multiple rectifier modules 230 are respectively connected to load devices to convert the AC voltage distributed by the AC power distribution module 220 into DC voltage and provide DC voltage to the load devices.

[0017] In embodiments of this disclosure, the DC power supply system 200 may be Figure 1 The power conversion device 121 shown can be connected to the AC power supply at the input terminal 211 of the transformer 210. Figure 1 The mains power 110 shown can be connected to the load device at the output terminal 232 of the rectifier module 230. Figure 1 The load device 130 shown.

[0018] In the embodiments of this disclosure, mains power refers to the industrial frequency AC power provided by the urban public power grid. Among them, 10kV belongs to the medium-voltage distribution standard voltage level of the urban public power grid, which is usually used to directly supply facilities such as data centers as the main power source.

[0019] In the embodiments of this disclosure, a transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. It mainly consists of an iron core and windings, and is commonly used for voltage step-up / step-down, impedance matching, and safety isolation. The iron core is typically made of stacked silicon steel sheets, forming a magnetic circuit and reducing eddy current losses. The windings are typically made of enameled wire or flat wire, including a primary winding connected to the power supply and a secondary winding that outputs electrical energy. The principle of electromagnetic induction in a transformer is as follows: when the primary winding is connected to an alternating current power supply, the current generates an alternating magnetic flux. This alternating magnetic flux couples through the iron core to the secondary winding, inducing an electromotive force and generating an induced voltage. If the number of turns in the secondary winding is greater than the number of turns in the primary winding, the voltage increases, and the transformer is a step-up transformer; if the number of turns in the secondary winding is less than the number of turns in the primary winding, the voltage decreases, and the transformer is a step-down transformer. The ratio of the rated voltage of the primary winding to the rated voltage of the secondary winding is usually called the turns ratio. The turns ratio of a step-up transformer is less than 1, and the turns ratio of a step-down transformer is greater than 1. The transformer 210 in the embodiments of this disclosure can be a step-down transformer with a turns ratio of less than 21.

[0020] In an optional example, the mains voltage is 10kV, transformer 210 is a 10 / 0.48kV transformer with a turns ratio of 10 / 0.48, the initial AC input voltage of transformer 210 is 10kV, transformer 210 can convert the 10kV voltage to a 0.48kV voltage, and the target AC output voltage of transformer 210 is 0.48kV.

[0021] In the embodiments of this disclosure, the AC power distribution module 220 can distribute the target AC voltage output from the transformer 210 according to the number and capacity of the rectifier modules 230. The embodiments of this disclosure do not limit the specific composition and structure of the AC power distribution module 220; the AC power distribution module 220 can be implemented using any structure capable of distributing the target AC voltage to multiple rectifier modules 230. For example, the AC power distribution module 220 can mainly consist of circuit breakers, copper busbars, auxiliary power supplies, current transformers (CTs), cables, buttons, indicator lights, terminals, insulators, etc. The selection of the components of the AC power distribution module 220 requires comprehensive consideration of factors such as capacity, voltage, current, and breaking capacity.

[0022] In an optional example, the target AC voltage output by transformer 210 is 0.48kV. AC distribution module 220 needs to be matched to this 0.48kV voltage, and its power frequency withstand voltage and other parameters need to match this voltage level to ensure reliable operation in a 0.48kV power grid. For example, AC distribution module 220 may include multiple independent 0.48kV circuit breakers. Typically, the number of circuit breakers is the same as the number of downstream rectifier modules 230. When the capacity of a single circuit breaker is insufficient to support the capacity of the downstream rectifier module 230, two or more circuit breakers can simultaneously provide input to the same rectifier module.

[0023] In the embodiments of this disclosure, the rectifier module 230 can convert the AC voltage distributed by the AC power distribution module 220 into a DC voltage output. The embodiments of this disclosure do not limit the specific composition and structure of the rectifier module 230; the rectifier module 230 can be implemented using any structure capable of converting AC voltage to DC voltage. For example, the rectifier module 230 can mainly consist of an input circuit breaker, an AC-to-DC voltage converter, an output circuit breaker, and a controller, wherein the AC-to-DC voltage converter is also called an ACDC converter. Similarly, the selection of components for the rectifier module 230 also needs to comprehensively consider factors such as capacity, voltage, and current.

[0024] In an optional example, the target AC voltage output by transformer 210 is 0.48kV. Rectifier module 230 needs to be matched to this 0.48kV voltage, and its power frequency withstand voltage and other parameters need to match this voltage level to ensure reliable operation in a 0.48kV power grid. For example, rectifier module 230 may include an AC-DC converter that can convert the input 0.48kV AC voltage into a DC voltage output.

[0025] In the embodiments of this disclosure, the number of rectifier modules 230 connected to the AC power distribution module 220 can be determined according to the specific application scenario, and the embodiments of this disclosure do not limit this. The capacities of the multiple rectifier modules 230 connected to the AC power distribution module 220 can be the same or different, and the embodiments of this disclosure do not limit this either.

[0026] The DC power supply system 200 provided by the embodiments of this disclosure can improve the power supply capacity and efficiency of the DC power supply system 200 by increasing the voltage level output by the transformer 210, and can reduce the current of the DC power supply system 200 under the same capacity, thereby reducing line losses and facilitating energy-saving operation of the DC power supply system 200 and reducing the cost of the DC power supply system 200.

[0027] In some alternative embodiments of this disclosure, such as Figure 2As shown, the DC power supply system 200 may further include: a DC power distribution module 240, whose input terminal 241 is connected to the output terminal 232 of the rectifier module 230, and whose output terminal 242 is connected to multiple rack-mount cabinets, for distributing the DC voltage output by the rectifier module 230 to the multiple rack-mount cabinets. The rack-mount cabinets are used to provide DC voltage to the load equipment. The rack-mount cabinets can be core equipment for power distribution and management in a data center, typically located at the end of a row of cabinets or any required location, primarily used to provide power distribution, monitoring, and control for rows of cabinets.

[0028] In embodiments of this disclosure, the DC power distribution module 240 can distribute the DC voltage output by the rectifier module 230 according to the number and capacity of the rectifier cabinets. The embodiments of this disclosure do not limit the specific structure of the DC power distribution module 240; it can be implemented using any structure capable of distributing DC voltage to multiple rectifier cabinets. In embodiments of this disclosure, the number of rectifier cabinets connected to the DC power distribution module 240 can be determined based on the specific application scenario, and this disclosure does not limit this number. The capacities of the multiple rectifier cabinets connected to the DC power distribution module 240 can be the same or different, and this disclosure also does not limit this number.

[0029] In this embodiment, a DC power distribution module 240 is set at the output end of the rectifier module 230 to distribute the DC voltage output by the rectifier module 230. This facilitates the reasonable branching of the output DC voltage and improves the ability of the DC power supply system 200 to meet different back-end load requirements.

[0030] In some alternative embodiments of this disclosure, such as Figure 2 As shown, the DC power supply system 200 may further include a circuit breaker 250. The first terminal 251 of the circuit breaker 250 is connected to the mains power, and the second terminal 252 of the circuit breaker 250 is connected to the input terminal 211 of the transformer 210. The circuit breaker is used to disconnect the transformer 210 from the mains power when the current in the transformer 210 exceeds its rated current. A circuit breaker is an important power protection switch that can automatically cut off the current when abnormal conditions such as overload, short circuit, or undervoltage occur in the circuit, thereby protecting the circuit and electrical equipment. The circuit breaker needs to be voltage-matched to the circuit it is in; generally, the rated voltage of the circuit breaker should be greater than or equal to the actual operating voltage of the circuit. For example, if the initial AC input voltage of the transformer 210 is 10kV, the circuit breaker 250 needs to be matched to a 10kV voltage. The embodiments of this disclosure do not limit the type of circuit breaker 250. For example, the circuit breaker 250 can be a sulfur hexafluoride circuit breaker or a vacuum circuit breaker, etc. The selection of the circuit breaker 250 can be determined according to the requirements and operating conditions of the DC power supply system.

[0031] In some optional embodiments of this disclosure, the DC power supply system 200 may further include a controller, which is connected to the transformer 210, the AC power distribution module 220, and multiple rectifier modules 230 respectively, for controlling the operation of the transformer 210, the AC power distribution module 220, and the multiple rectifier modules 230 based on configured parameters. Optionally, the controller may also include a communication port, through which the controller can receive configured parameters. The embodiments of this disclosure do not limit the type of the controller's communication port; for example, the communication port may be an RS485 serial communication port or a network communication port. The controller can remotely monitor and adjust the parameters set in the controller through the communication port, and can control the operation of the transformer 210, the AC power distribution module 220, and the multiple rectifier modules 230 according to the adjusted parameters. The controller can also be integrated with third-party devices such as environmental monitoring equipment through the communication port, allowing the third-party devices to communicate with the controller and control the DC power supply system 200.

[0032] This embodiment allows for convenient remote control and parameter adjustment of the DC power supply system 200 by controlling and setting the communication port. It also facilitates the connection of the DC power supply system 200 with other devices and increases the flexibility of the DC power supply system 200 in use.

[0033] In some alternative embodiments of this disclosure, transformer 210 includes a primary winding having at least two taps, also referred to as taps. The controller is further configured to adjust the target AC voltage output by transformer 210 between a first voltage value and a second voltage value by selecting a tap connecting the primary winding to mains power, wherein the first voltage value is higher than the second voltage value.

[0034] For example, the first voltage value is 480V and the second voltage value is 380V. The primary winding of transformer 210 includes two taps: a first tap and a second tap. When the controller selects the first tap of the primary winding to connect to the mains power, transformer 210 outputs a target AC voltage of 480V. When the controller selects the second tap of the primary winding to connect to the mains power, transformer 210 outputs a target AC voltage of 380V.

[0035] In one optional example, the primary winding of transformer 210 may include two taps, 10 / 0.48kV and 10 / 0.38kV respectively, with a target output voltage regulation range of 480V-380V. In another optional example, such as Figure 3 As shown, Figure 3The diagram below shows a transformer in a DC power supply system according to some embodiments of the present disclosure. The primary winding of the transformer 210 may include seven taps, which are 10.5 / 0.48kV, 10.25 / 0.48kV, 10 / 0.48kV, 10 / 0.44kV, 10 / 0.38kV, 10.25 / 0.38kV, and 10.5 / 0.38kV respectively.

[0036] In this embodiment, by setting at least two taps on the primary winding of transformer 210, the number of turns of the primary winding can be changed by using the position of the taps, thereby affecting the induced voltage of the secondary winding of transformer 210. When the grid voltage fluctuates or the load changes, the output voltage of transformer 210 can be adjusted by selecting the taps, thereby protecting the electrical equipment from the effects of excessively high or low voltage, and ensuring that the output voltage of transformer 210 meets the load requirements.

[0037] Optionally, the DC power supply system 200 may further include a transfer switch and an uninterruptible power supply (UPS). The first terminal of the transfer switch is connected to the output terminal 212 of the transformer 210, and the second terminal of the transfer switch is connected to the input terminal 221 of the AC power distribution module 220. The input terminal of the UPS is connected to the third terminal of the transfer switch, and the output terminal of the UPS is connected to the load device.

[0038] The controller is also connected to a changeover switch to control the switch to connect the output terminal 212 of transformer 210 to the input terminal 221 of AC power distribution module 220, and to select a tap to cause transformer 210 to output a first voltage value. This first voltage value is then converted from AC voltage by AC power distribution module 220 and rectifier module 230 to provide DC voltage to the load equipment. The controller is also used to control the changeover switch to connect the output terminal 212 of transformer 210 to the input terminal of UPS, and to select a tap to cause transformer 210 to output a second voltage value. This second voltage value is then processed by UPS to provide AC voltage to the load equipment.

[0039] A UPS (Uninterruptible Power Supply) is a type of uninterruptible power supply containing energy storage devices, primarily used to provide uninterrupted power to equipment with high power stability requirements. When the mains power input is normal, the UPS stabilizes the mains power and supplies it to the load equipment. In this state, the UPS acts as an AC voltage regulator, while simultaneously charging its internal battery. When the mains power input is interrupted, the UPS converts the DC power from the battery to AC power via an inverter and supplies it to the load equipment, enabling the equipment to maintain normal operation and protecting its hardware and software from damage. Therefore, UPSs are widely used as the mainstream power supply equipment in existing data centers.

[0040] In one optional example, the first voltage value is 480V, and the second voltage value is 380V. When the controller controls the switching switch to connect the output terminal 212 of transformer 210 to the input terminal 221 of AC distribution module 220, and selects the tap to make transformer 210 output 480V AC voltage, transformer 210 is connected to AC distribution module 220 and rectifier module 230. The AC distribution module 220 and rectifier module 230 convert the 480V AC voltage to DC voltage, providing DC voltage to the load device. When the controller controls the switching switch to connect the output terminal 212 of transformer 210 to the input terminal of UPS, and selects the tap to make transformer 210 output 380V AC voltage, transformer 210 is connected to UPS. The UPS processes the 380V AC voltage, providing AC voltage to the load device.

[0041] This embodiment allows a single transformer 210 to adapt to the power supply requirements of different power supply devices by selecting the tap of the primary winding of the transformer 210 according to the changes in the power supply equipment connected to the rear end of the transformer 210, thus achieving compatibility between DC power supply and UPS.

[0042] In some optional embodiments of this disclosure, the controller is also used to detect the status of the transformer 210, the AC distribution module 220, and the plurality of rectifier modules 230, and to issue an alarm in response to a fault in one of the transformer 210, the AC distribution module 220, and the plurality of rectifier modules 230. Specifically, by collecting the status data of the transformer 210, the AC distribution module 220, and the plurality of rectifier modules 230, the controller can perform fault diagnosis on the DC power supply system 200, and can issue an alarm when a fault is detected in one of these components. This embodiment improves the reliability of the DC power supply system 200 by using the controller to detect the status of the transformer 210, the AC distribution module 220, and the plurality of rectifier modules 230 for fault diagnosis and issuing an alarm when a fault occurs.

[0043] This disclosure also provides a data center, which may include: load devices and the DC power supply system 200 as described in any of the above embodiments. The load devices may be... Figure 1 The load device 130 is shown. The DC power supply system 200 is used to provide electrical energy to the load device.

[0044] In this embodiment, the specific structure of the DC power supply system 200, its connection relationship with other devices, its control method, and the resulting technical effects can be referred to separately. Figure 2 The relevant descriptions of the corresponding implementation methods will not be repeated here.

[0045] Currently, the DC power systems used in data centers have relatively low transformer output voltage levels, such as 380V, which limits the power supply capacity and efficiency of the DC power systems. Under the same capacity, DC power systems draw more current and have higher line losses compared to systems with higher transformer output voltage levels, which is not conducive to the energy-saving operation of DC power systems, and DC power systems are also more expensive.

[0046] The DC power supply system 200 provided in this disclosure improves the power supply capacity and efficiency of the DC power supply system 200 by increasing the output voltage level of the transformer 210, for example, to 480V. Under the same capacity, it reduces the current of the DC power supply system 200, lowers line losses, and promotes energy-saving operation, thereby reducing the cost of the DC power supply system 200. Compared to a 380V voltage level, under the same current conditions, the power supply capacity of the 480V DC power supply system 200 can be increased by 26%, and the efficiency can be increased by more than 0.3%. Under the same capacity, the current of the DC power supply system 200 can be reduced by 26%, and line losses can be reduced by more than 50%.

[0047] Because transformers of different voltage levels have different heat dissipation requirements, transformers with higher voltage levels typically have larger capacities and higher heat dissipation requirements. Therefore, embodiments of this disclosure also provide a transformer control method, which may include the following steps: Step 1: Collect the winding temperature and core temperature values ​​of the transformer; Step 2: Determine whether the winding temperature value exceeds the winding temperature protection threshold and whether the core temperature value exceeds the core temperature protection threshold, wherein the winding temperature protection threshold and the core temperature protection threshold are determined based on the output voltage of the transformer; In response to the winding temperature value exceeding the winding temperature protection threshold, and / or the core temperature value exceeding the core temperature protection threshold, step 3 is executed.

[0048] Step 3: Start the protection device corresponding to the transformer.

[0049] Step 3 may include the following steps: Step 31: In response to the winding temperature value reaching the first winding temperature value, and / or the core temperature value reaching the first core temperature value, start the fan corresponding to the transformer for ventilation and heat dissipation; Step 32: In response to the winding temperature value reaching the second winding temperature value, and / or the core temperature value reaching the second core temperature value, an over-temperature alarm is issued through the controller; Step 33: In response to the winding temperature value reaching the third winding temperature value, and / or the core temperature value reaching the third core temperature value, the controller issues an emergency alarm for excessive temperature and controls the circuit breaker at the input terminal of the transformer to open, causing the transformer to stop operating.

[0050] For example, the temperature value of the first winding and / or the temperature value of the first core is 90°C, the temperature value of the second winding and / or the temperature value of the second core is 130°C, and the temperature value of the third winding and / or the temperature value of the third core is 150°C.

[0051] The control method for this transformer may also include: Step 4: In response to the winding temperature value being equal to the winding temperature protection threshold and the core temperature value being equal to the core temperature protection threshold, stop the operation of the protection device corresponding to the transformer.

[0052] For example, if the winding temperature and / or core temperature is 80°C, the corresponding fan of the transformer will be started for ventilation and heat dissipation; if the winding temperature and / or core temperature is 120°C, the stop controller will issue an overheat alarm.

[0053] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A direct current power supply system, comprising: a transformer, an input end of the transformer being connected with a commercial power supply, for converting an initial alternating current voltage provided by the commercial power supply into a target alternating current voltage, wherein a ratio of the initial alternating current voltage to the target alternating current voltage is less than 21; an alternating current distribution module, an input end of the alternating current distribution module being connected with an output end of the transformer, for distributing the target alternating current voltage output by the transformer; a plurality of rectifier modules, input ends of the plurality of rectifier modules being respectively connected with output ends of the alternating current distribution module, output ends of the plurality of rectifier modules being respectively connected with load devices, for converting alternating current voltage distributed by the alternating current distribution module into direct current voltage, and providing the direct current voltage to the load devices. 2.The direct current power supply system according to claim 1, further comprising: a direct current distribution module, an input end of the direct current distribution module being connected with output ends of the rectifier modules, an output end of the direct current distribution module being connected with a plurality of column head cabinets, for distributing the direct current voltage output by the rectifier modules to the plurality of column head cabinets, wherein the column head cabinets are used to provide direct current voltage to the load devices. 3.The direct current power supply system according to claim 1, further comprising: a circuit breaker, a first end of the circuit breaker being connected with the commercial power supply, a second end of the circuit breaker being connected with the input end of the transformer, for disconnecting the connection between the transformer and the commercial power supply when a current of the transformer is greater than a rated current. 4.The direct current power supply system according to any one of claims 1-3, further comprising: a controller, the controller being connected with the transformer, the alternating current distribution module, and the plurality of rectifier modules respectively, for controlling the transformer, the alternating current distribution module, and the plurality of rectifier modules to operate based on configured parameters.

5. The direct current power supply system of claim 4, wherein, the transformer comprises a primary winding, the primary winding comprising at least two taps; the controller is further configured to adjust the target alternating current voltage output by the transformer between a first voltage value and a second voltage value by selecting the tap connected with the commercial power supply, wherein the first voltage value is higher than the second voltage value. 6.The direct current power supply system according to claim 5, further comprising: a switch, a first end of the switch being connected with an output end of the transformer, a second end of the switch being connected with an input end of the alternating current distribution module; an uninterruptible power supply, an input end of the uninterruptible power supply being connected with a third end of the switch, an output end of the uninterruptible power supply being connected with the load devices; the controller is further connected with the switch, for controlling the switch to connect the output end of the transformer with the input end of the alternating current distribution module, and selecting the tap to make the transformer output the first voltage value, so that the alternating current voltage of the first voltage value is converted into direct current voltage by the alternating current distribution module and the rectifier modules, and direct current voltage is provided to the load devices. The controller is further configured to control the switch to connect the output of the transformer to the input of the UPS and to select the tap such that the transformer outputs the second voltage value, and the UPS processes the AC voltage of the second voltage value to provide an AC voltage to the load device.

7. The direct current power supply system of claim 6, wherein, The first voltage value is 480 V and the second voltage value is 380 V.

8. The direct current power supply system of claim 4, wherein, The controller further comprises a communication port through which the controller receives configured parameters.

9. The direct current power supply system of claim 4, wherein, The controller is further configured to detect a status of the transformer, the AC distribution module, and the plurality of rectifier modules, and to issue an alert in response to a failure of one of the transformer, the AC distribution module, and the plurality of rectifier modules.

10. A data center comprising: A load device and a DC power supply system according to any one of claims 1-9, the DC power supply system configured to provide a DC voltage to the load device.

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