Data center power supply system

Abstract

The present application belongs to the technical field of power electronics. Disclosed is a data center power supply system. The power supply system comprises: a plurality of multi-port solid-state transformers, each of which comprises an input end, a first output end and a second output end, wherein the input end is electrically connected to a medium-voltage power grid, each multi-port solid-state transformer is used for converting a medium-voltage alternating current that is input by the input end into a direct current of a first voltage value and a direct current of a second voltage value, the plurality of multi-port solid-state transformers supply power to a plurality of direct-current loads of a data center, the first output end of each multi-port solid-state transformer is electrically connected to the corresponding direct-current load, and the working voltages of the direct-current loads correspond to the first voltage value; and a first inversion module, which is electrically connected to the second output ends of the plurality of multi-port solid-state transformers, and is used for supplying power to alternating-current loads of the data center after inverting direct currents of the second voltage value that are output by the second output ends.

Description

Data center power supply system

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on November 21, 2023, with application number 202311568343.3 and application name “Data Center Power Supply System”. The entire contents of the application are incorporated by reference into this application. Technical Field

[0003] The embodiments of the present application relate to the field of power electronics technology, and in particular to a data center power supply system. Background Art

[0004] Traditional data center power supply systems are divided into AC and DC systems based on load. These different power supply schemes require different power supply systems designed for different voltage standards and levels. These systems suffer from high costs, low efficiency, and limited versatility. Therefore, a hybrid AC / DC power supply system is needed to achieve unified and efficient power supply. Summary of the Invention

[0005] The embodiments of the present application provide a data center power supply system that can solve the problem of low power supply efficiency and poor versatility caused by using different power supply systems to power a data center.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] An embodiment of the present application provides a data center power supply system, including: a plurality of multi-port solid-state transformers 100, each of the multi-port solid-state transformers 100 including an input end 101, a first output end 102, and a second output end 103, wherein the input end 101 is electrically connected to a medium-voltage power grid 200, and the multi-port solid-state transformer 100 is configured to convert medium-voltage alternating current inputted from the input end 101 into direct current (DC) with a first voltage value and a second voltage value, outputting the DC with the first voltage value through the first output end 102 and outputting the DC with the second voltage value through the second output end 103, wherein the first voltage value is less than the second voltage value; Multiple multi-port solid-state transformers 100 supply power to multiple DC loads 300 in the data center. Multiple multi-port solid-state transformers 100 correspond one-to-one to multiple DC loads 300. The first output terminal 102 of the multi-port solid-state transformer 100 is electrically connected to the corresponding DC load 300, and the operating voltage of the DC load 300 corresponds to the first voltage value. The first inverter module 400 is electrically connected to the second output terminal 103 of the multiple multi-port solid-state transformers 100, and is used to invert the DC power of the second voltage value output by the second output terminal 103 to supply power to the AC load 500 of the data center.

[0008] The data center power supply system provided in the embodiments of the present application converts input medium-voltage AC power into DC power of a first voltage value and a second voltage value through a multi-port solid-state transformer (SST). The DC power of the first voltage value is used to power the DC loads of the data center, and the DC power of the second voltage value is inverted by a first inverter module to power the AC loads of the data center. The embodiments of the present application can achieve a hybrid power supply of AC and DC power through a multi-port solid-state transformer, which has high integration, saves costs, and improves the efficiency of the power supply system.

[0009] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0011] FIG1 shows a schematic diagram of a data center power supply system provided by an exemplary embodiment of the present application;

[0012] FIG2 shows a schematic diagram of another data center power supply system provided by an exemplary embodiment of the present application;

[0013] FIG3 shows a schematic diagram of another data center power supply system provided by an exemplary embodiment of the present application;

[0014] FIG4 shows a schematic diagram of another data center power supply system provided by an exemplary embodiment of the present application.

[0015] Figure numerals: 100: multi-port solid-state transformer (first multi-port solid-state transformer / second multi-port solid-state transformer / third multi-port solid-state transformer / fourth multi-port solid-state transformer); 101: input end, 102: first output end, 103: second output end; 200: medium-voltage power grid; 300: DC load; 400: first inverter module; 500: AC load; 600: industrial frequency AC transformer; 700: second inverter module; 800: AC power load; 900: DC converter; 110: first energy storage module; 120: photovoltaic module; 130: first switch; 140: second energy storage module; 150: second switch. DETAILED DESCRIPTION

[0016] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0017] The data center power supply system according to an embodiment of the present invention is described below with reference to FIG. 1 to FIG. 4 .

[0018] Figure 1 shows a schematic diagram of a data center power supply system provided by an exemplary embodiment of the present application. As shown in Figure 1, the power supply system mainly includes: multiple multi-port solid-state transformers 100, a medium-voltage power grid 200, multiple DC loads 300, a medium-voltage power grid 200 and an AC load 500.

[0019] In an embodiment of the present application, a plurality of multi-port solid-state transformers (SST) 100, namely SST1, SST2, ..., SSTN in the figure, the multi-port solid-state transformer 100 includes an input end 101, a first output end 102, and a second output end 103, the input end 101 is electrically connected to the medium-voltage power grid 200, and the multi-port solid-state transformer 100 is used to convert the medium-voltage alternating current input by the input end 101 into direct current of a first voltage value and direct current of a second voltage value, output the direct current of the first voltage value through the first output end 102, and output the direct current of the second voltage value through the second output end 103, the first voltage value being less than the second voltage value. value; multiple multi-port solid-state transformers 100 supply power to multiple DC loads 300 of the data center, multiple multi-port solid-state transformers 100 correspond one-to-one to multiple DC loads 300, the first output end 102 of the multi-port solid-state transformer 100 is electrically connected to the corresponding DC load 300, and the operating voltage of the DC load 300 corresponds to the first voltage value; a first inverter module 400 is electrically connected to the second output end 103 of the multiple multi-port solid-state transformers 100, and is used to invert the DC power of the second voltage value output by the second output end 103 to supply power to the AC load 500 of the data center.

[0020] Through the data center power supply system provided in the embodiment of the present application, the DC power output by the first output terminal 102 of the multi-port solid-state transformer 100 can provide DC power to the DC load, and then the DC power output by the second output terminal 103 of the multi-port solid-state transformer 100 is inverted into AC power by the first inverter module 400 to provide AC power for the AC load of the data center. In this way, DC and AC power supply can be achieved through the same power supply system, with high integration, cost savings, and improved efficiency of the power supply system.

[0021] In one optional implementation, the medium-voltage alternating current (AC) of the medium-voltage power grid may be 10 kV. The 10 kV AC is input into a multi-port solid-state transformer through an input terminal, and the multi-port solid-state transformer can convert the 10 kV AC into two DC voltages of different voltages, for example, 240 V DC and 750 V DC. 240 V may be a first voltage value, output through a first output terminal of the multi-port solid-state transformer, and 750 V may be a second voltage value, output through a second output terminal. Of course, this is not limiting. In practical applications, the first voltage value output from the first output terminal and the second voltage value output from the second output terminal of the multi-port solid-state transformer can be adjusted based on the actual voltages required by the DC load and AC load of the data center.

[0022] The first output end of the multi-port solid-state transformer is electrically connected to the DC load of the data center, providing power to the DC load in a one-to-one correspondence. The operating voltage of the DC load is a first voltage value of 240V. The second output end of the multi-port solid-state transformer is electrically connected to the first inverter module. The first inverter module can invert the 750V DC power output by the multi-port solid-state transformer into 380V AC power to power the AC load of the data center.

[0023] The data center power supply system provided in the embodiments of the present application converts input medium-voltage AC power into two types of DC power with different voltages using a multi-port solid-state transformer. The low-voltage DC power can power DC loads, while the high-voltage DC power can power AC loads after being inverted by a first inverter module. This not only enables hybrid AC and DC power supply, but also provides a highly integrated power supply system, high efficiency, and resource conservation.

[0024] In one implementation, as shown in FIG2 , the power supply system may further include a power frequency AC transformer 600 electrically connected to the medium voltage grid 200. The power frequency AC transformer 600 is configured to convert the current provided by the medium voltage grid 200 into power frequency AC power for output to power the data center's AC loads 500. With this implementation, the data center's AC loads can be powered by either the power output of the power frequency AC transformer 600 or the AC power output of the first inverter module 400, thereby ensuring reliable power supply to the AC loads.

[0025] In an embodiment of the present application, the first inverter module 400 may include multiple inverters (also referred to as converters). As shown in Figure 2, the first inverter module 400 may include multiple inverters (DC-to-AC, D2A), each inverter being electrically connected to the second output terminal 103 of a multi-port solid-state transformer, and configured to convert direct current of a second voltage value outputted from the second output terminal 103 of the multi-port solid-state transformer into alternating current of a target voltage value, and provide the alternating current to an AC load.

[0026] In one implementation, as shown in FIG2 , the power supply system may further include: a second inverter module 700 electrically connected to the second output terminals 103 of the plurality of multi-port solid-state transformers 100, configured to invert the DC power of the second voltage value outputted from the second output terminals 103 to supply power to the AC power load 800 of the data center. As shown in FIG2 , the second inverter module 700 may include a plurality of inverters (Direct-to-Avatar, D2A), each of which is electrically connected to the second output terminal 103 of a multi-port solid-state transformer, configured to convert the DC power of the second voltage value outputted from the second output terminal 103 of the multi-port solid-state transformer into AC power of a target voltage value, and provide the AC power to an AC power load 800.

[0027] In one implementation, as shown in FIG2 , the power supply system may further include: a plurality of DC-to-DC (D2D) converters 900 and a first energy storage module 110. The plurality of DC converters 900 correspond one-to-one to the plurality of multi-port solid-state transformers 100, with the first ends of the DC converters 900 electrically connected to the second ends of the corresponding multi-port solid-state transformers 100; and the first energy storage module 110 is electrically connected to the second ends of the plurality of DC converters 900. With this implementation, energy can be stored in the first energy storage module 110 when the medium-voltage grid is normal. Thus, in the event of a medium-voltage grid failure, the first energy storage module 110 can supply power to the data center, further improving power supply reliability.

[0028] In one implementation, as shown in FIG2 , the power supply system may further include a photovoltaic module 120 electrically connected to the second ends of the plurality of DC converters 900. The photovoltaic module 120 can utilize sunlight to store energy, and the DC converter 900 can charge the first energy storage module 110.

[0029] In an optional implementation, as shown in Figure 2, during normal operation of the data center power supply system, if the medium-voltage AC power from the medium-voltage grid is 10 kV, the SST simultaneously outputs 240 V DC and 750 V DC, and the first inverter module 400 and the second inverter module 700 operate in a voltage source inversion state. The SST can directly power 240 V DC loads, which, combined with the characteristics of the SST, offers high power supply efficiency. 380 V AC loads can be powered by a power-frequency AC transformer, which improves power supply system efficiency. The 750 V DC power output by the SST can be inverted by the second inverter module 700 to power the data center's AC power loads. The 750 V busbar can be connected to the photovoltaic module 120, which generates DC power from sunlight and then converts the generated power into 750 V DC power via a DC converter. The SST and the photovoltaic module 120 can jointly power the first energy storage module 110, smoothing photovoltaic fluctuations without requiring complex power management functions. The energy storage system (first energy storage module 110 ) is placed on the 750V bus side and can replace the traditional uninterruptible power supply (UPS) battery.

[0030] In an optional implementation of the embodiment of the present application, as shown in FIG2 , the data center power supply system may further include: a plurality of first switches 130, each corresponding one-to-one to each of the plurality of multi-port solid-state transformers 100, wherein a first end of each first switch 130 is electrically connected to the second output end 103 of the corresponding multi-port solid-state transformer 100, and a second end of each of the plurality of first switches 130 is electrically connected to one another. The plurality of first switches 130 allows, when a fault occurs in an SST, for a normal SST to be selected to simultaneously power two AC loads, thereby closing the first switches 130 corresponding to the normal SST and the faulty SST.

[0031] In an optional implementation of the embodiment of the present application, as shown in FIG2 , the data center power supply system provided in the embodiment of the present application may further include: a second energy storage module 140 electrically connected to the first output terminals 102 of the plurality of multi-port solid-state transformers 100. The second energy storage module 140 is electrically connected to the first output terminals 102 of the plurality of multi-port solid-state transformers 100, thereby enabling charging and energy storage through the first output terminals 102 of the plurality of multi-port solid-state transformers 100. In the event of a fault in an SST, power can be supplied to the corresponding DC load, thereby preventing damage to the DC load due to a sudden voltage drop caused by an SST fault.

[0032] Optionally, as shown in FIG2 , the data center power supply system provided in an embodiment of the present application may further include: a plurality of second switches 150, each corresponding one-to-one to each of the plurality of multi-port solid-state transformers 100, a first end of each second switch 150 electrically connected to the first output end 102 of the corresponding multi-port solid-state transformer 100, and a second end of each second switch 150 electrically connected to the second energy storage module 140. The plurality of second switches 150 allows, when an SST fails, for a normal SST to be selected to simultaneously power two DC loads, thereby closing the second switches 150 corresponding to the normal SST and the faulty SST.

[0033] In an optional implementation, as shown in FIG3 , in the event of a fault in the medium-voltage power grid 200, the multiple first switches 130 are closed, the first energy storage module 110 supplies power to the multiple DC loads 300 via the first output terminal 102, and supplies power to the AC load 500 via the first inverter module 400. Optionally, in the event of a fault in the medium-voltage power grid 200, the multiple second switches 150 are closed, and the second energy storage module 140 supplies power to the multiple DC loads 300.

[0034] In the above implementation, when a medium-voltage power grid fails, if the medium-voltage AC power of the medium-voltage power grid is 10KV, when the 10KV fails, the 10KV port of the multi-port SST is closed, leaving only the 240V and 750V ports, that is, the input end is closed, and the first output end and the second output end are retained. When the 10KV fails, multiple second switches are closed, and the backup power on the 240V side (the second energy storage module) is started to prevent the 240V side bus voltage from suddenly dropping. After the 240V and 750V of the multi-port SST are working normally, multiple first switches are closed, and the energy storage system (the first energy storage module) can provide energy through the 750V side to support the continuous operation of the load. The first energy storage module can supply power to the multiple DC loads through the first output end, and can also supply power to the AC load through the first inverter module. When the 10KV fails, because the first inverter module is in the AC voltage source mode, the load power can be supplied by the first inverter module, and its energy is provided by the 750V energy storage system.

[0035] As can be seen from the above operating mode, the 750V energy storage system provides the majority of the power supply system's energy, significantly reducing the capacity required for the 240V backup system. AC loads can also be powered by the 750V energy storage system. Therefore, a single 750V energy storage system can simultaneously meet the backup power requirements for AC and DC loads, saving system costs.

[0036] In another optional implementation, as shown in FIG4 , if a first multi-port solid-state transformer 100 among the plurality of multi-port solid-state transformers 100 fails, the first switches 130 corresponding to the first multi-port solid-state transformer 100 and at least one second multi-port solid-state transformer 100 are closed, and the second multi-port solid-state transformer 100 is a multi-port solid-state transformer 100 that has not failed among the plurality of solid-state transformers. Optionally, if a third multi-port solid-state transformer 100 among the plurality of multi-port solid-state transformers 100 fails, the second switches 150 corresponding to the third multi-port solid-state transformer 100 and at least one fourth multi-port solid-state transformer 100 are closed, and the fourth multi-port solid-state transformer 100 is a multi-port solid-state transformer 100 that has not failed among the plurality of solid-state transformers.

[0037] During the design process, the SST is composed of multiple cells connected in parallel. The cell capacity can be selected as a rated capacity such as 500KVA. When a cell fails, energy can be transferred through the first switch and the second switch, which can improve system reliability. In the event of a failure of a multi-port solid-state transformer among the multiple multi-port solid-state transformers in the power supply system, the first switch corresponding to the solid-state transformer and a non-failed multi-port solid-state transformer is closed, or the second switch is closed. The corresponding DC load or AC load can be powered by the non-failed multi-port solid-state transformer connected to it, and then operate normally.

[0038] In another optional implementation, in the event of a failure of the first inverter module 400, the first energy storage module 110 feeds energy to the medium-voltage grid 200 via the multiple multi-port solid-state transformers 100. If all inverter units fail, the 750V-side energy storage system (the first energy storage module) can feed energy to the 10KV medium-voltage grid via the 750V-side busbar using SST, thereby achieving energy storage and power supply, realizing an AC 2N+1 architecture. Using the first energy storage module as a backup device can provide the redundancy required in the event of a failure, creating a high-availability power supply method.

[0039] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0040] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A data center power supply system, comprising: A plurality of multi-port solid-state transformers (100), the multi-port solid-state transformers (100) comprising an input end (101), a first output end (102) and a second output end (103), the input end (101) being electrically connected to a medium-voltage power grid (200), the multi-port solid-state transformer (100) being used to convert medium-voltage alternating current inputted from the input end (101) into direct current with a first voltage value and direct current with a second voltage value, outputting the direct current with the first voltage value through the first output end (102), and outputting the direct current with the second voltage value through the second output end (103), the first voltage value being less than the second voltage value; A plurality of the multi-port solid-state transformers (100) supply power to a plurality of DC loads (300) of a data center, the plurality of the multi-port solid-state transformers (100) correspond one-to-one to the plurality of the DC loads (300), a first output end (102) of the multi-port solid-state transformer (100) is electrically connected to the corresponding DC load (300), and an operating voltage of the DC load (300) corresponds to the first voltage value; The first inverter module (400) is electrically connected to the second output ends (103) of the plurality of multi-port solid-state transformers (100) and is used for inverting the direct current with a second voltage value outputted from the second output ends (103) to supply power to the alternating current load (500) of the data center.

2. The power supply system according to claim 1, wherein: Also includes: An industrial frequency AC transformer (600) is electrically connected to the medium voltage power grid (200), and the industrial frequency AC transformer (600) converts the current provided by the medium voltage power grid (200) into industrial frequency AC output to supply power to the AC load (500) of the data center.

3. The power supply system according to claim 1, wherein: Also includes: The second inverter module (700) is electrically connected to the second output terminals (103) of the plurality of multi-port solid-state transformers (100) and is used for inverting the direct current with a second voltage value outputted from the second output terminals (103) to supply power to the alternating current power load (800) of the data center.

4. The power supply system according to claim 2, wherein: Also includes: A plurality of direct current converters (900), the plurality of direct current converters (900) corresponding one to one to the plurality of multi-port solid-state transformers (100), the first end of the direct current converter (900) being electrically connected to the second output end (103) of the corresponding multi-port solid-state transformer (100); The first energy storage module (110) is electrically connected to the second ends of the plurality of DC converters (900).

5. The power supply system according to claim 4, wherein: Also includes: The photovoltaic module (120) is electrically connected to the second ends of the plurality of DC converters (900).

6. The power supply system according to claim 4, wherein: The invention also comprises: a plurality of first switches (130), wherein the plurality of first switches (130) correspond one-to-one to the plurality of multi-port solid-state transformers (100), wherein a first end of the first switch (130) is electrically connected to a second output end (103) of the corresponding multi-port solid-state transformer (100), and second ends of the plurality of first switches (130) are electrically connected to each other.

7. The power supply system according to claim 6, wherein: In the event that a first multi-port solid-state transformer (100) among the plurality of multi-port solid-state transformers (100) fails, a first switch (130) corresponding to the first multi-port solid-state transformer (100) and at least one second multi-port solid-state transformer (100) is closed, and the second multi-port solid-state transformer (100) is a multi-port solid-state transformer (100) that has not failed among the plurality of solid-state transformers.

8. The power supply system according to claim 6, wherein: In the event of a fault in the medium voltage power grid (200), the plurality of first switches (130) are closed, the first energy storage module (110) supplies power to the plurality of DC loads (300) via the first output terminal (102), and supplies power to the AC load (500) via the first inverter module (400).

9. The power supply system according to claim 8, wherein: In the event of a fault in the first inverter module (400), the first energy storage module (110) feeds energy to the medium voltage power grid (200) through the plurality of multi-port solid-state transformers (100).

10. The power supply system according to any one of claims 1 to 9, wherein: Also includes: The second energy storage module (140) is electrically connected to the first output ends (102) of the plurality of multi-port solid-state transformers (400).

11. The power supply system according to claim 10, wherein: The invention also comprises: a plurality of second switches (150), wherein the plurality of second switches (150) correspond one-to-one to the plurality of multi-port solid-state transformers (100), a first end of the second switch (150) being electrically connected to a first output end (102) of the corresponding multi-port solid-state transformer (100), and a second end of the second switch (150) being electrically connected to the second energy storage module (140).

12. The power supply system according to claim 11, wherein: In the event that a third multi-port solid-state transformer (100) among the plurality of multi-port solid-state transformers (100) fails, the second switches (150) corresponding to the third multi-port solid-state transformer (100) and at least one fourth multi-port solid-state transformer (100) are closed, and the fourth multi-port solid-state transformer (100) is a multi-port solid-state transformer (100) that has not failed among the plurality of solid-state transformers.

13. The power supply system according to claim 11, wherein: In the event of a fault in the medium voltage power grid (200), the plurality of second switches (150) are closed, and the second energy storage module (140) supplies power to the plurality of DC loads (300).

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