Data center power supply system

Abstract

The invention discloses a data center power supply system, and belongs to the technical field of power electronics. The power supply system comprises a plurality of multi-port solid-state transformers, each multi-port solid-state transformer comprises an input end, a first output end and a second output end, and the input ends are electrically connected with a medium-voltage power grid; the multi-port solid-state transformer is used for converting medium-voltage alternating current input by the input end into direct current with a first voltage value and direct current with a second voltage value; the multiple multi-port solid-state transformers supply power to multiple direct-current loads of the data center, the first output ends of the multi-port solid-state transformers are electrically connected with the corresponding direct-current loads, and the working voltage of the direct-current loads corresponds to the first voltage value; and the first inversion module is electrically connected with the second output ends of the plurality of multi-port solid-state transformers and is used for inverting the direct current with the second voltage value output by the second output ends and then supplying power to the alternating current load of the data center.

Description

Technical Field

[0001] 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

[0002] The traditional data center power supply system can be divided into AC power supply system and DC power supply system according to the load. Different power supply schemes need to be designed according to different voltage standards and levels. They have the disadvantages of high cost, low efficiency and poor versatility. Therefore, it is necessary to build an AC / DC hybrid power supply system to achieve unified and efficient power supply. Summary of the invention

[0003] The embodiment of the present application provides a data center power supply system, which can solve the problem of low power supply efficiency and poor universality caused by using different power supply systems to power a data center.

[0004] In order to solve the above technical problems, this application is implemented as follows:

[0005] The embodiment of the present application provides a data center power supply system, including: a plurality of multi-port solid-state transformers 100, the multi-port solid-state transformer 100 including 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 the medium-voltage alternating current inputted from the input end 101 into direct current of a first voltage value and direct current of a second voltage value, outputting the direct current of the first voltage value through the first output end 102, and outputting the direct current of 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 of 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.

[0006] The data center power supply system provided in the embodiment of the present application converts the input medium-voltage AC power into DC power of a first voltage value and DC power of 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 load of the data center, and the DC power of the second voltage value is used to power the AC load of the data center after being inverted by the first inverter module. The embodiment of the present application can realize mixed power supply of AC and DC through a multi-port solid-state transformer, which has high integration, saves costs, and can improve the efficiency of the power supply system.

[0007] 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

[0008] 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.

[0009] Figure 1 A schematic diagram of a data center power supply system provided by an exemplary embodiment of the present application is shown;

[0010] Figure 2 A schematic diagram of another data center power supply system provided by an exemplary embodiment of the present application is shown;

[0011] Figure 3 A schematic diagram of another data center power supply system provided by an exemplary embodiment of the present application is shown;

[0012] Figure 4 A schematic diagram of another data center power supply system provided by an exemplary embodiment of the present application is shown.

[0013] Reference numerals:

[0014] 100: a multi-port solid-state transformer (a first multi-port solid-state transformer / a second multi-port solid-state transformer / a third multi-port solid-state transformer / a fourth multi-port solid-state transformer);

[0015] 101: input terminal, 102: first output terminal, 103: second output terminal;

[0016] 200: Medium voltage power grid;

[0017] 300: DC load;

[0018] 400: a first inverter module;

[0019] 500: AC load;

[0020] 600: industrial frequency AC transformer;

[0021] 700: Second inverter module;

[0022] 800: AC power load;

[0023] 900: DC converter;

[0024] 110: First energy storage module;

[0025] 120: Photovoltaic module;

[0026] 130: First switch;

[0027] 140: Second energy storage module;

[0028] 150: Second switch. Detailed implementation manners

[0029] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0030] The following is combined with Figure 1-Figure 4 to describe the data center power supply system according to an embodiment of the present invention.

[0031] Figure 1 The schematic diagram of a data center power supply system provided by an exemplary embodiment of the present application is shown. As Figure 1 shown, the power supply system mainly includes: a plurality of multi-port solid-state transformers 100, a medium-voltage power grid 200, a plurality of DC loads 300, the medium-voltage power grid 200, and an AC load 500.

[0032] 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 terminal 101, a first output terminal 102, and a second output terminal 103, the input terminal 101 is electrically connected to a 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 terminal 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 terminal 102, and output the direct current of the second voltage value through the second output terminal 103, the first voltage value is 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, a 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; a 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 for inverting 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.

[0033] Through the data center power supply system provided in the embodiment of the present application, the DC power outputted 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 outputted 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, so that DC and AC power supply can be realized through the same power supply system, with high integration, cost saving, and improved efficiency of the power supply system.

[0034] In an optional implementation, the medium voltage alternating current of the medium voltage grid may be 10KV, and the 10KV alternating current is input into the multi-port solid-state transformer through the input end, and the multi-port solid-state transformer may convert it into direct current of two different voltage values, for example, 240V DC and 750V DC. Among them, 240V may be a first voltage value, which is output through the first output end of the multi-port solid-state transformer, and 750V may be a second voltage value, which is output through the second output end. Of course, this is not limited to this, and in actual applications, the first voltage value outputted from the first output end and the second voltage value outputted from the second output end of the multi-port solid-state transformer may be adjusted according to the actual voltage required by the DC load and the AC load of the data center.

[0035] The first output end of the multi-port solid-state transformer is electrically connected to the DC load of the data center, and supplies power to the DC load in a one-to-one correspondence manner. At this time, the working voltage of the DC load is a first voltage value of 240 V. The second output end of the multi-port solid-state transformer is electrically connected to the first inverter module, and the first inverter module can invert the 750V DC power output by the multi-port solid-state transformer into 380V AC power to supply power to the AC load of the data center.

[0036] The data center power supply system provided in the embodiment of the present application converts the input medium voltage AC power into two DC power with different voltage values ​​through a multi-port solid-state transformer. The DC power with a low voltage value can supply power to the DC load, and the DC power with a high voltage value can supply power to the AC load after being inverted by the first inverter module. Not only can the mixed power supply of AC and DC be realized, but the power supply system has high integration, high working efficiency, and can save resources.

[0037] In one implementation, if Figure 2 As shown, the power supply system may further include: an industrial frequency AC transformer 600, electrically connected to the medium voltage grid 200, and the industrial frequency AC transformer 600 is used to convert the current provided by the medium voltage grid 200 into industrial frequency AC output to supply power to the AC load 500 of the data center. Through this implementation, the AC load of the data center can be powered by the power supply output by the industrial frequency AC transformer 600, or by the AC power output by the first inverter module 400, thereby ensuring the reliability of the AC load power supply.

[0038] In the embodiment of the present application, the first inverter module 400 may include a plurality of inverters (also referred to as converters), such as Figure 2 As shown, 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 being used to convert direct current of a second voltage value outputted by the second output terminal 103 of the multi-port solid-state transformer into alternating current of a target voltage value, and providing the alternating current to an AC load.

[0039] In one implementation, if Figure 2 As shown, 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, for inverting the DC power of the second voltage value output by the second output terminals 103 to supply power to the AC power load 800 of the data center. Figure 2As shown, the second inverter module 700 may include multiple inverters (Direct-to-Avatar, D2A), each inverter is electrically connected to the second output terminal 103 of a multi-port solid-state transformer, and is used to convert direct current of a second voltage value output by 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 power load 800.

[0040] In one implementation, if Figure 2 As shown, 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, and the first end of the DC converter 900 is electrically connected to the second end of the corresponding multi-port solid-state transformer 100; the first energy storage module 110 is electrically connected to the second end of the plurality of DC converters 900. Through this implementation, energy can be stored in the first energy storage module 110 when the medium-voltage power grid is normal, so that when the medium-voltage power grid fails, the first energy storage module 110 can supply power to the data center, further improving the reliability of power supply.

[0041] In one implementation, if Figure 2 As shown, 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 light to store energy, and the DC converter 900 can charge the first energy storage module 110.

[0042] In an optional implementation, Figure 2As shown, when the power supply system of the data center is working normally, if the medium voltage AC power of the medium voltage grid is 10KV, the SST outputs 240V DC and 750VDC at the same time, and the first inverter module 400 and the second inverter module 700 work in the voltage source inversion state. The SST can directly supply power to the 240V DC DC load. Combined with the characteristics of the SST, the power supply efficiency is relatively high; the 380V AC load can be supplied by the industrial frequency AC transformer, and the power supply through the industrial frequency AC transformer can improve the efficiency of the power supply system. The 750V DC power output by the SST can be inverted by the second inverter module 700 to supply power to the AC power load of the data center. The 750V busbar can be connected to the photovoltaic module 120 through the 750V busbar. The photovoltaic module 120 can generate DC power by light, and then convert the generated electricity into 750V DC power through the DC converter. The SST can supply power to the first energy storage module 110 together with the photovoltaic module 120, which can smooth photovoltaic fluctuations without the need for 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.

[0043] In an optional implementation of the embodiment of the present application, Figure 2 As shown, the data center power supply system may further include: a plurality of first switches 130, the plurality of first switches 130 corresponding one to one with the plurality of multi-port solid-state transformers 100, the first end of the first switch 130 being electrically connected to the second output end 103 of the corresponding multi-port solid-state transformer 100, and the second ends of the plurality of first switches 130 being electrically connected to each other. Through the plurality of first switches 130, when a certain SST fails, a normal SST can be selected to supply power to two AC loads at the same time, so that the first switches 130 corresponding to the normal SST and the failed SST can be closed.

[0044] In an optional implementation of the embodiment of the present application, Figure 2 As shown, the data center power supply system provided in the embodiment of the present application may further include: a second energy storage module 140, which is 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, so that charging and energy storage can be performed through the first output terminals 102 of the plurality of multi-port solid-state transformers 100, and when a certain SST fails, power can be supplied to the corresponding DC load, thereby preventing the DC load from being damaged due to a sudden voltage drop when the SST fails.

[0045] Alternatively, if Figure 2As shown, the data center power supply system provided in the embodiment of the present application may also include: a plurality of second switches 150, the plurality of second switches 150 correspond one-to-one to the plurality of multi-port solid-state transformers 100, the first end of the second switch 150 is electrically connected to the first output end 102 of the corresponding multi-port solid-state transformer 100, and the second end of the second switch 150 is electrically connected to the second energy storage module 140. Through the plurality of second switches 150, when a certain SST fails, a normal SST can be selected to supply power to two DC loads at the same time, so that the second switches 150 corresponding to the normal SST and the failed SST can be closed.

[0046] In an optional implementation, Figure 3 As shown, in the case 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 through the first output terminal 102, and supplies power to the AC load 500 through the first inverter module 400. Optionally, in the case 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.

[0047] 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, and only the 240V and 750V ports are retained, 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 (second energy storage module) on the 240V side is started to prevent the 240V side bus voltage from suddenly dropping. After the 240V and 750V of the multi-port SST work normally, multiple first switches are closed, and the energy storage system (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 multiple DC loads through the first output end, and can also supply power to AC loads 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.

[0048] It can be seen from the above working mode that the main energy of the power supply system is provided by the 750V energy storage system, and the capacity required for the 240V side backup power system can be greatly reduced; the AC side load can also be powered by the 750V side energy storage system. Therefore, a set of 750V side energy storage system can meet the AC and DC load backup requirements at the same time, saving system costs.

[0049] In another optional implementation, Figure 4As shown, in the case where the first multi-port solid-state transformer 100 among multiple multi-port solid-state transformers 100 fails, the first switch 130 corresponding to the first multi-port solid-state transformer 100 and at least one second multi-port solid-state transformer 100 closes. The second multi-port solid-state transformer 100 is a multi-port solid-state transformer 100 among the multiple solid-state transformers that has not failed. Optionally, in the case where the third multi-port solid-state transformer 100 among multiple multi-port solid-state transformers 100 fails, the second switch 150 corresponding to the third multi-port solid-state transformer 100 and at least one fourth multi-port solid-state transformer 100 closes. The fourth multi-port solid-state transformer 100 is a multi-port solid-state transformer 100 among the multiple solid-state transformers that has not failed.

[0050] During the design process of the SST, it is composed of multiple monomers in parallel. The rated capacity of a monomer can be selected as 500 KVA or the like. When a monomer fails, energy transfer can be carried out through the first switch and the second switch, which can improve the system reliability. In the case where a multi-port solid-state transformer among multiple multi-port solid-state transformers in the power supply system fails, the first switch corresponding to this solid-state voltage transformer and a non-failed multi-port solid-state transformer closes, or the second switch closes. The corresponding DC load or AC load can be powered by the non-failed multi-port solid-state transformer connected to it, and thus operate normally.

[0051] In another optional implementation manner, in the case where the first inverter module 400 fails, the first energy storage module 110 feeds energy to the medium-voltage power grid 200 through the multiple multi-port solid-state transformers 100. When all inverter units fail, the 750V-side energy storage system (the first energy storage module) can use the SST to feed energy to the 10KV medium-voltage power grid through the 750V-side bus to achieve energy storage power supply and realize the AC 2N+1 architecture. Using the first energy storage module as a standby device can support the redundancy required during a failure, which is a highly available power supply method.

[0052] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and the practice of the invention disclosed herein. The present 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 known common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the claims.

[0053] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A data center power supply system, It is characterized in that include: 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that Also includes: 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), a first end of the first switch (130) being 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) being electrically connected to each other.

7. The power supply system according to claim 6, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that Also includes: 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, It is characterized in that 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, It is characterized in that 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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