Power supply system

Abstract

Embodiments of the present invention provide a power supply system, for use in supplying electric energy to a plurality of electric units. The power supply system comprises: a plurality of primary power supply units, wherein the primary power supply units each are used for supplying electric energy to at least two electric units, and the electric units each obtain the electric energy from at least two primary power supply units; and a backup power supply unit for supplying common backup power to the plurality of primary power supply units.

Description

Power supply system

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410866380.0, filed on June 28, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of power supply, in particular to a power supply system. BACKGROUND

[0004] In order to realize safe and reliable power supply of a data center, a power supply system of the data center generally adopts a 2N redundant architecture power supply technology. Such a power supply system can realize redundant power supply for loads, but the device utilization rate is only 50%, which is low and the cost is high. For this reason, a power supply system based on a reserve redundancy (RR) architecture of power electronic transformers has been developed, in which N power supply units of N+1 power supply units provide one-to-one primary power supply for N power consumption units (also referred to as power consumption devices), and one power supply unit is used as a backup power supply unit, which can supply power to the power consumption units when the primary power supply unit fails. However, since the primary power supply and the power consumption units are in a one-to-one relationship, there is only one backup power supply unit for N power consumption units, and therefore the reliability of the power supply system of the RR architecture is low. SUMMARY

[0005] The present disclosure provides a power supply system for providing electrical energy to a plurality of power consumption units, the power supply system comprising: a plurality of primary power supply units, each of the primary power supply units being configured to provide electrical energy to at least two of the power consumption units, each of the power consumption units being configured to obtain electrical energy from at least two of the primary power supply units; and a backup power supply unit configured to provide a common backup power source for the plurality of primary power supply units. BRIEF DESCRIPTION OF DRAWINGS

[0006] FIG. 1 is a schematic diagram of a structure of a conventional 2N architecture power supply system;

[0007] FIG. 2 is a schematic diagram of a structure of a conventional RR architecture power supply system;

[0008] FIG. 3 is a schematic diagram of a power supply system according to an embodiment of the present disclosure;

[0009] FIG. 4 is a schematic diagram of a topology of a power supply system according to an embodiment of the present disclosure;

[0010] FIG. 5 is a schematic diagram of a topology of a primary power supply unit according to an embodiment of the present disclosure;

[0011] Fig. 6 is a schematic diagram of a control mode of a three-port transformer according to an embodiment of the present disclosure;

[0012] Fig. 7 is a schematic diagram of energy flow in a power supply system according to an embodiment of the present disclosure;

[0013] Fig. 8 is a schematic diagram of energy flow in a power supply system according to an embodiment of the present disclosure;

[0014] Fig. 9 is a schematic diagram of energy flow in a power supply system according to an embodiment of the present disclosure;

[0015] Fig. 10 is a schematic diagram of energy flow in a power supply system according to an embodiment of the present disclosure;

[0016] Fig. 11 is a schematic diagram of energy flow in a power supply system according to an embodiment of the present disclosure;

[0017] Fig. 12 is a schematic diagram of energy flow in a power supply system according to an embodiment of the present disclosure;

[0018] Fig. 13 is a schematic diagram of energy flow when a bus short circuit occurs in the first branch A;

[0019] Fig. 14 is a simulation diagram of a voltage waveform of the second branch B when the first branch A outputs an open circuit in the power supply system according to an embodiment of the present disclosure;

[0020] Fig. 15 is a simulation diagram of a current of the first branch A when a bus short circuit occurs in the first branch A in the power supply system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the power supply system provided by the present disclosure is described in detail below with reference to the accompanying drawings.

[0022] In the following, example embodiments will be described more fully with reference to the accompanying drawings, in which example embodiments can be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. Rather, the purpose of the embodiments is to enable a full and complete understanding of the scope of the present disclosure to those skilled in the art.

[0023] In the case of no conflict, each embodiment of the present disclosure and each feature in the embodiments can be combined with each other.

[0024] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0026] Embodiments herein can be described with reference to both plan and / or cross-sectional illustrations. Accordingly, the illustrated embodiments can vary depending on the manufacturing technique and / or tolerance. Thus, embodiments are not limited to the specific examples described herein, but include modifications within the spirit and scope of the embodiments. Accordingly, the zones illustrated in the drawings have schematic properties, and the shape of the zones shown in the drawings illustrates the specific shape of the zones of the elements, but are not intended to be limiting.

[0027] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0028] FIG. 1 is a structural schematic diagram of a conventional power supply system of 2N architecture. As shown in FIG. 1, the power supply system includes power frequency transformers 101, 102 and converters 103, 104, wherein the power frequency transformers 101, 102 are used to step down the AC input, and the converters 103, 104 are used to convert the stepped-down AC input into DC output, the converters 103, 104 include two outputs respectively connected to two input ends 105, 106 of the load 107, thereby realizing 2N redundant power supply for the load 107 (N = 1 in FIG. 1), that is, each load 107 corresponds to two power frequency transformers 101, 102 and converters 103, 104. It is not difficult to see that the device utilization rate of the power supply system of 2N architecture is only 50%, and the cost is high.

[0029] To this end, a power supply system of RR (Reserve Redundancy) architecture has been developed. The power supply system of RR architecture includes N+1 power supply units, including N primary power supply units and one backup power supply unit, and the backup power supply unit provides a common backup power supply for the N primary power supply units.

[0030] FIG. 2 is a structural schematic diagram of a power supply system of a traditional RR architecture. As shown in FIG. 2, the power supply system includes a power source, four automatic transfer switches ATS1, ATS2, ATS3, ATS4, and four power supply units. The power source includes a commercial power supply 201 and a diesel generator system 202, and the power source can be 10kV alternating current. Each automatic transfer switch corresponds to a power supply unit and is used to control the on-off between the power supply unit and the power source.

[0031] The power supply units include three main power supply units SST1, SST2, SST3 and one standby power supply unit SST4. The standby power supply unit SST4 is used to provide a common standby power source for the main power supply units SST1, SST2, and SST3. The main power supply units SST1, SST2, and SST3 have multi-port energy management capabilities and can seamlessly switch when different branches supply power.

[0032] Each of the main power supply units SST1, SST2, and SST3 includes a first branch A and a second branch B, and the first branch A and the second branch B of each main power supply unit are electrically connected to a server. Specifically, the first branch A and the second branch B of the main power supply unit SST1 are electrically connected to a first server S1, the first branch A and the second branch B of the main power supply unit SST2 are electrically connected to a second server S2, and the first branch A and the second branch B of the main power supply unit SST3 are electrically connected to a third server S3. For any one of the main power supply units, the first branch A and the second branch B are not isolated and affect each other. For example, when the first branch A fails, it is easy to cause the second branch B to short circuit, thereby affecting the reliability of power supply. For any one server, the standby power supply unit SST4 is a common standby power source for the three main power supply units SST1, SST2, and SST3, and thus has a high failure rate and low reliability.

[0033] Therefore, the power supply system provided by the embodiments of the present disclosure can provide power for multiple power consumption units, has high reliability of power supply, can improve the utilization rate of power supply equipment, and can reduce the cost of the power supply system.

[0034] FIG. 3 is a schematic diagram of a power supply system provided by the embodiments of the present disclosure, and FIG. 4 is a topological schematic diagram of a power supply system provided by the embodiments of the present disclosure. Referring to FIGS. 3 and 4, the power supply system provided by the embodiments of the present disclosure includes multiple main power supply units 1 and one standby power supply unit 2. At least two of the multiple main power supply units 1 and the standby power supply unit 2 can provide power for a power consumption unit 3, and the standby power supply unit 2 is a standby power source for the multiple main power supply units 1. When a main power supply unit fails, the standby power supply unit 2 can replace the main power supply unit to provide power for the power consumption unit 3.

[0035] In the embodiments of the present disclosure, each main power supply unit 1 is configured to supply power to at least two power consumption units 3, and each power consumption unit 3 obtains power from at least two main power supply units. In one aspect, each main power supply unit 1 can supply power to multiple power consumption units 3 at the same time, and the utilization rate of the main power supply unit 1 is improved relative to the power supply system of the 2N architecture. In another aspect, each power consumption unit 3 can obtain power supplied by multiple main power supply units 1, and the power consumption unit 3 obtains more reliable power. When the main power supply unit 1 fails, the standby power supply unit 2 can supply power to the power consumption unit 3, thereby further ensuring the reliability of power consumption of the power consumption unit 3.

[0036] The embodiments of the present disclosure do not limit the correspondence between the main power supply unit 1 and the power consumption unit 3. One main power supply unit 1 can supply power to two, three or more power consumption units 3, and correspondingly, each power consumption unit 3 can obtain power from two or three main power supply units 1. For ease of description, the following will be described by taking an example in which each main power supply unit 1 supplies power to two power consumption units 3, and each power consumption unit 3 obtains power from two main power supply units 1.

[0037] In some embodiments, the power consumption unit 3 includes a first branch A and a second branch B, that is, the power consumption unit 3 can obtain power from the first branch A and / or the second branch B.

[0038] The main power supply unit 1 includes at least a first output end and a second output end. The first output end of the main power supply unit 1 is electrically connected to the second branch B of one power consumption unit 3, and the second output end of the main power supply unit 1 is electrically connected to the first branch A of another power consumption unit 3. Each main power supply unit 1 can supply power to two power consumption units 3, that is, the output of the main power supply unit 1 is connected across two power consumption units 3. The two power consumption units 3 can be adjacent power consumption units 3, or can be non-adjacent power consumption units 3. When the main power supply unit 1 is connected across two adjacent power consumption units 3, the length of the connection line can be reduced, and the connection line is not messy, which is convenient for operation and maintenance.

[0039] In some embodiments, when the main power supply unit 1 supplies power to multiple power consumption units 3, the main power supply unit 1 can supply power to the multiple power consumption units 3 in a balanced load manner, so that the capacity can be fully utilized.

[0040] The standby power supply unit 2 includes at least a first output end and a second output end. The first output end of the standby power supply unit 2 is electrically connected to the first branch of all power consumption units in the multiple power consumption units, and the second output end of the standby power supply unit 2 is electrically connected to the second branch of all power consumption units in the multiple power consumption units.

[0041] As shown in FIG. 3 and FIG. 4, the first output end of the backup power supply unit 2 is electrically connected with the second branch B of the three power consuming units 3, and the second output end of the backup power supply unit 2 is electrically connected with the first branch A of the three power consuming units 3, that is, the backup power supply unit 2 can provide electric energy to the power consuming units 3 through the first branch A of the power consuming units 3, or can provide electric energy to the power consuming units 3 through the second branch B of the power consuming units 3.

[0042] In some embodiments, any one of the plurality of main power supply units 1 provides electric energy to two adjacent power consuming units 3 among the at least two power consuming units 3; any one of the at least two power consuming units 3 obtains electric energy from two adjacent main power supply units 1 among the plurality of main power supply units 1.

[0043] As shown in FIG. 7, the main power supply unit SST1 can provide electric energy to the first power consuming unit 31 and the second power consuming unit 32 arranged adjacently. The main power supply unit SST2 can provide electric energy to the second power consuming unit 32 and the third power consuming unit 33 arranged adjacently. The main power supply unit SST3 can provide electric energy to the third power consuming unit 33 and the first power consuming unit 31 arranged adjacently. For the first power consuming unit 31, electric energy can be obtained from the main power supply unit SST1 and the main power supply unit SST3. The second power consuming unit 32 can obtain electric energy from the main power supply unit SST1 and the main power supply unit SST2, and the third power consuming unit 33 can obtain electric energy from the main power supply unit SST2 and the main power supply unit SST3.

[0044] In some embodiments, the power supply system further comprises a first control switch for controlling the on-off between the backup power supply unit 2 and the power consuming unit 3. The first control switch is connected in series between the first output end of the backup power supply unit and the first branch of each power consuming unit, and the first control switch is connected in series between the second output end of the backup power supply unit and the second branch of each power consuming unit.

[0045] In some embodiments, the first control switch includes but is not limited to an automatic transfer switch.

[0046] For example, six automatic transfer switches DL1, DL2, DL3, DL4, DL5, DL6 are arranged between the backup power supply unit 2 and the power consuming unit 3, wherein the automatic transfer switches DL1, DL2, DL3 are used to control the on-off between the backup power supply unit 2 and the second branch B of the power consuming unit 3, and the automatic transfer switches DL4, DL5, DL6 are used to control the on-off between the backup power supply unit 2 and the first branch A of the power consuming unit 3. It should be noted that when the power supply system includes more main power supply units 1, the number of first control switches increases accordingly.

[0047] In some embodiments, the power supply system further comprises a second control switch, each of the main power supply unit 1 and the power source 4 being connected in series with the second control switch; the standby power supply unit 2 and the power source 4 being connected in series with the second control switch. The second control switch includes but is not limited to an automatic transfer switch.

[0048] As shown in FIG. 4, the second control switches ATS1, ATS2, ATS3, and ATS4 are arranged between the main power supply unit 1, the standby power supply unit 2, and the power source 4, wherein the second control switches ATS1, ATS2, and ATS3 are used to control the on-off between the power source 4 and the main power supply unit 1, and the second control switch ATS4 is used to control the on-off between the power source 4 and the standby power supply unit 2.

[0049] FIG. 5 is a schematic diagram of a topology of a main power supply unit according to an embodiment of the present disclosure. As shown in FIG. 5, the main power supply unit 1 comprises a solid-state transformer T1 (the main power supply unit comprises two solid-state transformers T1 in FIG. 5), a first input end of the solid-state transformer T1 being electrically connected to a first output end of the power source 4, and a second input end of the solid-state transformer T1 being electrically connected to a second output end of the power source 4; the solid-state transformer T1 comprises at least two output ports, any one of the at least two output ports being an independent output port, and each of the output ports being electrically connected to one of the power consuming units.

[0050] In some embodiments, the main power supply unit comprises a rectifier module 51 (the main power supply unit comprises two rectifier modules 51 in FIG. 5), an output end of the rectifier module 51 being electrically connected to an input end of the solid-state transformer T1, and the solid-state transformer T1 being used to separate the output signal of the rectifier module 51 into multiple independent outputs.

[0051] Specifically, a first input end of the rectifier module 51 is electrically connected to a first output end of the power source 4, and a second input end of the rectifier module 51 is electrically connected to a second output end of the power source 4; a first output end of the rectifier module 51 is electrically connected to a first input end of the solid-state transformer T1, and a second output end of the rectifier module 51 is electrically connected to a second input end of the solid-state transformer T1.

[0052] In some embodiments, the rectifier module 51 adopts a single-phase inverter, including an input inductor L1 and an input bridge H1, wherein the input inductor L1 includes a first end (left end in the figure) and a second end (right end in the figure), the input bridge H1 includes a first input end, a second input end, a first output end and a second output end, the first end of the input inductor L1 is electrically connected to the first output end of the power supply 4, the second end of the input inductor L1 is electrically connected to the first input end of the input bridge H1, and the second input end of the input bridge H1 is electrically connected to the second output end of the power supply 4. The first output end of the input bridge H1 is electrically connected to the first input end of the solid-state transformer T1, and the second output end of the input bridge H1 is electrically connected to the second input end of the solid-state transformer T1.

[0053] In some embodiments, the input bridge H1 includes a first insulated gate bipolar transistor Q1, a third insulated gate bipolar transistor Q3, a second insulated gate bipolar transistor Q2 and a fourth insulated gate bipolar transistor Q4, wherein the first end of the input inductor L1 is electrically connected to the power supply, and the second end of the input inductor L1 is electrically connected to the first end of the first insulated gate bipolar transistor Q1.

[0054] The first end of the first insulated gate bipolar transistor Q1 is electrically connected to the second end of the second insulated gate bipolar transistor Q2, and the second end of the first insulated gate bipolar transistor Q1 is electrically connected to the second end of the third insulated gate bipolar transistor Q3. The first end of the third insulated gate bipolar transistor Q3 is electrically connected to the second end of the fourth insulated gate bipolar transistor Q4, and the second end of the third insulated gate bipolar transistor Q3 is the first output end of the rectifier module; the first end of the second insulated gate bipolar transistor Q2 is electrically connected to the first end of the fourth insulated gate bipolar transistor Q4, and the second end of the second insulated gate bipolar transistor Q2 is electrically connected to the first end of the first insulated gate bipolar transistor Q1 and the second end of the input inductor L1. The first end of the fourth insulated gate bipolar transistor Q4 and the first end of the second insulated gate bipolar transistor Q2 are electrically connected to the second output end of the rectifier module, and the second end of the fourth insulated gate bipolar transistor Q4 is electrically connected to the first end of the third insulated gate bipolar transistor Q3.

[0055] In some embodiments, a first capacitor C1 is further arranged between the first output end and the second output end of the input bridge H1, and the first capacitor C1 is used to absorb power frequency fluctuation and reduce the fluctuation of the electrical signal input to the solid-state transformer T1.

[0056] In some embodiments, a bypass switch K1 is arranged at the first input end and the second input end of the input bridge H1, and is used to control the on-off of the bypass.

[0057] In some embodiments, the solid-state transformer T1 includes a primary side bridge H2 and at least two secondary side bridges H3, H4, the primary side bridge H2 is arranged at the input end of the solid-state transformer T1, and the at least two secondary side bridges H3, H4 are arranged at the output end of the solid-state transformer T1.

[0058] The primary side bridge H2 includes a fifth insulated gate bipolar transistor Q5, a sixth insulated gate bipolar transistor Q6, a seventh insulated gate bipolar transistor Q7, and an eighth insulated gate bipolar transistor Q8, wherein the first end of the fifth insulated gate bipolar transistor Q5 is electrically connected to the first output end of the primary side bridge H2, the second end of the sixth insulated gate bipolar transistor Q6 is electrically connected to the first output end of the primary side bridge H2, the second end of the fifth insulated gate bipolar transistor Q5 is electrically connected to the first output end of the input bridge H1, the first end of the sixth insulated gate bipolar transistor Q6 is electrically connected to the second output end of the input bridge H1, the first end of the seventh insulated gate bipolar transistor Q7 is electrically connected to the second output end of the primary side bridge H2, the second end of the seventh insulated gate bipolar transistor Q7 is electrically connected to the first output end of the input bridge H1, the first end of the eighth insulated gate bipolar transistor Q8 is electrically connected to the second output end of the input bridge H1, and the second end of the eighth insulated gate bipolar transistor Q8 is electrically connected to the second output end of the primary side bridge H2.

[0059] In some embodiments, a resonance capacitor C2 is further connected in series at the first output end of the primary side bridge H2, for suppressing resonance of the output circuit of the primary side bridge H2.

[0060] In some embodiments, the secondary side bridge H3 includes a ninth insulated gate bipolar transistor Q9, a tenth insulated gate bipolar transistor Q10, an eleventh insulated gate bipolar transistor Q11, and a twelfth insulated gate bipolar transistor Q12, wherein the first end of the ninth insulated gate bipolar transistor Q9 is electrically connected to the first input end of the secondary side bridge H3, the second end of the tenth insulated gate bipolar transistor Q10 is electrically connected to the first end of the ninth insulated gate bipolar transistor Q9, the second end of the ninth insulated gate bipolar transistor Q9 is electrically connected to the first output end of the secondary side bridge H3, the first end of the tenth insulated gate bipolar transistor Q10 is electrically connected to the second output end of the secondary side bridge H3, the first end of the eleventh insulated gate bipolar transistor Q11 is electrically connected to the second input end of the secondary side bridge H3, the second end of the eleventh insulated gate bipolar transistor Q11 is electrically connected to the second end of the twelfth insulated gate bipolar transistor Q12, the second end of the eleventh insulated gate bipolar transistor Q11 is electrically connected to the first output end of the secondary side bridge H3, the first end of the twelfth insulated gate bipolar transistor Q12 is electrically connected to the second output end of the secondary side bridge H3, and the first end of the twelfth insulated gate bipolar transistor Q12 is electrically connected to the second input end of the secondary side bridge H3.

[0061] In some embodiments, a resonance capacitor C3 is electrically connected between the first input end and the second input end of the secondary side bridge H3, for suppressing resonance of the input circuit of the secondary side bridge H3.

[0062] In some embodiments, a filter capacitor C4 is electrically connected between the first output end and the second output end of the secondary side bridge H3 for filtering the output of the secondary side bridge H3.

[0063] In some embodiments, the secondary side bridge H4 comprises a thirteenth insulated gate bipolar transistor Q13, a fourteenth insulated gate bipolar transistor Q14, a fifteenth insulated gate bipolar transistor Q15 and a sixteenth insulated gate bipolar transistor Q16, wherein the first end of the thirteenth insulated gate bipolar transistor Q13 is electrically connected to the first input end of the secondary side bridge H4, the second end of the thirteenth insulated gate bipolar transistor Q13 is electrically connected to the first output end of the secondary side bridge H4, the first end of the fourteenth insulated gate bipolar transistor Q14 is electrically connected to the second output end of the secondary side bridge H4, the second end of the fourteenth insulated gate bipolar transistor Q14 is electrically connected to the first input end of the secondary side bridge H4; the first end of the fifteenth insulated gate bipolar transistor Q15 is electrically connected to the second input end of the secondary side bridge H4, the second end of the fifteenth insulated gate bipolar transistor Q15 is electrically connected to the first output end of the secondary side bridge H4; the first end of the sixteenth insulated gate bipolar transistor Q16 is electrically connected to the second output end of the secondary side bridge H4, the second end of the sixteenth insulated gate bipolar transistor Q16 is electrically connected to the second input end of the secondary side bridge H4.

[0064] In some embodiments, a resonance capacitor C5 is electrically connected between the first input end and the second input end of the secondary side bridge H4 for suppressing resonance of the input circuit of the secondary side bridge H4.

[0065] In some embodiments, a filter capacitor C6 is electrically connected between the first output end and the second output end of the secondary side bridge H4 for filtering the output of the secondary side bridge H4.

[0066] It should be noted that the first output end and the second output end of the secondary side bridge H3 are electrically connected to the first branch A of the power utilization unit, and the first output end and the second output end of the secondary side bridge H4 are electrically connected to the second branch B of the power utilization unit.

[0067] In some embodiments, the transformer T1 adopts a solid state transformer, which can isolate the secondary side bridge H3 and the secondary side bridge H4, so as to form independent isolation circuits for the first branch A and the second branch B, and when the first branch A is short-circuited or open-circuited, it will not affect the second branch B, thereby improving the reliability of the power supply system.

[0068] In some embodiments, the output current of the secondary side bridge H3 and the secondary side bridge H4 can be low-voltage direct current, which respectively provides power for the first branch A and the second branch B.

[0069] As shown in FIG. 4 and FIG. 5, in some embodiments, the power supply system further comprises a power supply 4 and a battery pack 5, wherein the power supply 4 is electrically connected with the input end of the main power supply unit 1, the power supply 4 comprises a commercial power 201 and / or a diesel generator system 202, the diesel generator system 202 is used as a supplement of the commercial power 201, and the diesel generator system 202 can provide power for the main power supply unit 1 when the commercial power 201 fails. The diesel generator system 202 comprises a plurality of diesel generators G1, G2, …, G7.

[0070] The battery pack 5 is electrically connected with the input end of the power consumption unit 3, and the battery pack 5 provides power for the power consumption unit 3 in the case of power interruption. The battery pack 5 is arranged in a direct hanging mode without any voltage conversion link, and has high reliability.

[0071] In the embodiments of the present disclosure, the diesel generator system 202 is used as a backup of the commercial power 201, the backup power supply unit 2 is used as a backup of the main power supply unit 1, and the battery pack 5 can be used as a backup power supply unit of the main power supply unit 1 and the backup power supply unit 2, thereby providing reliable power supply for the power consumption unit 3 through triple protection and improving the reliability of power consumption of the power consumption unit 3 in all directions.

[0072] The multi-port transformer can adopt a synchronous pulse generation mode, and the wave generation mode is a mode of sending the same pulse to the corresponding common modules. This mode can support power supply to two or more ports at the same time, and the ports do not affect each other.

[0073] FIG. 6 is a schematic diagram of a control mode of a three-port transformer provided in the embodiments of the present disclosure. As shown in FIG. 6, the working mode of the three-port transformer is a pulse-width modulation (PWM) rectifier working mode of the middle bus, which can output stable voltage, and the insulated gate bipolar transistors in the primary side bridge and the auxiliary transformer bridge adopt synchronous pulses to form a DC-X structure (direct current transformer), and the voltage output by the auxiliary transformer bridge is equal to the middle bus voltage multiplied by the transformer ratio.

[0074] The power supply unit provided in the embodiments of the present disclosure is a multi-port cross-redundancy power supply. When a power supply fault occurs in a power consumption unit, if a branch (low-voltage direct current) fails, the power consumption unit can be seamlessly transferred to a branch of a nearby other three-port transformer, and the power consumption unit can still work normally by being powered by the nearby main power supply unit; when a medium-voltage part fails, the load of the power consumption unit can be borne by two nearby main power supply units, and the power consumption unit can work normally; and when the power supply of the power consumption unit is insufficient, the backup power supply unit can be used for power supply.

[0075] The power supply system provided by the embodiments of the present disclosure can supply power to each power consumption unit by two main power supply units and one standby power supply unit, and the N+1 power supply units provide the reliability of 2N+1 power supply units, so the reliability is higher than that of the 2N architecture and the RR architecture. However, the number of main power supply units is the same as that of the RR architecture and far lower than that of the 2N architecture, so the cost of the power supply system can be reduced.

[0076] FIG. 7 is a schematic diagram of energy flow in one mode of the power supply system provided by the embodiments of the present disclosure. As shown in FIG. 7, the wide arrow in the figure represents normal power supply. When the power consumption units 31-33 are all normal, the three main power supply units SST1, SST2 and SST3 supply power to the power consumption units 31-33 through the first branch A and the second branch B, and the entire power supply system can still work normally.

[0077] FIG. 8 is a schematic diagram of energy flow in another mode of the power supply system provided by the embodiments of the present disclosure. As shown in FIG. 8, when the first branch A of the main power supply unit SST1 fails, that is, the single low-voltage output fails, the second power consumption unit 32 can obtain power through the second branch B of the main power supply unit SST2, and the entire power supply system can still work normally.

[0078] FIG. 9 is a schematic diagram of energy flow in another mode of the power supply system provided by the embodiments of the present disclosure. As shown in FIG. 9, when the first branch A of the main power supply unit SST1 and the second branch B of the main power supply unit SST3 fail, that is, the low-voltage outputs of the two single branches fail, the second power consumption unit 32 can obtain power through the second branch B of the main power supply unit SST2, and the third power consumption unit 33 can obtain power through the first branch A of the main power supply unit SST2, and the entire power supply system can still work normally.

[0079] FIG. 10 is a schematic diagram of energy flow in another mode of the power supply system provided by the embodiments of the present disclosure. As shown in FIG. 10, when the second branch B of the main power supply unit SST1, the second branch B of the main power supply unit SST2 and the second branch B of the main power supply unit SST3 fail, that is, the low-voltage outputs of the three single branches fail, the first power consumption unit 31 can obtain power through the first branch A of the main power supply unit SST3, the second power consumption unit 32 can obtain power through the first branch A of the main power supply unit SST1, and the third power consumption unit 33 can obtain power through the first branch A of the main power supply unit SST2, and the entire power supply system can still work normally.

[0080] FIG. 11 is a schematic diagram of energy flow in one mode of the power supply system according to an embodiment of the present disclosure. As shown in FIG. 11, when the first branch A and the second branch B of the main power supply unit SST2 fail, i.e., the medium voltage side of the main power supply unit SST2 fails, the second power consumer 32 can obtain power through the first branch A of the main power supply unit SST1, the third power consumer 33 can obtain power through the second branch B of the main power supply unit SST3, and the entire power supply system can still work normally.

[0081] FIG. 12 is a schematic diagram of energy flow in another mode of the power supply system according to an embodiment of the present disclosure. As shown in FIG. 12, when the first branch A and the second branch B of the main power supply unit SST2 and the first branch A and the second branch B of the main power supply unit SST3 fail, i.e., two medium voltage sides fail, the first power consumer 31 can obtain power through the second branch B of the main power supply unit SST1, the second power consumer 32 can obtain power through the first branch A of the main power supply unit SST1 and through the standby power supply unit SST4, and the third power consumer 33 can obtain power through the standby power supply unit SST4, and the entire power supply system can still work normally.

[0082] In some embodiments, the failure modes of the power supply system include short circuit and open circuit, such as output open circuit of the first branch A and bus short circuit of the first branch A.

[0083] When the output of the first branch A is open, the output of the first branch A is equivalent to load rejection, and the power supply switching process includes: the output energy of the first branch A drops to 0, and the output of the second branch B remains unchanged; the energy output by the corresponding rectifier module cannot immediately drop, resulting in an increase in the intermediate bus voltage; since the main power supply unit and the power consumer are open-loop circuits, the voltage output by the second circuit B increases, and if the voltage output by the second circuit B does not exceed the highest voltage of the power supply system, there will be no impact between the first branch A and the second branch B.

[0084] When the bus of the first branch A is short-circuited, the power supply switching process includes: the output of the first branch A undergoes capacitor discharge, and the first branch A discharges through the intermediate bus; since the first branch A and the second branch B are in parallel structure, the voltage drop of the output of the first branch A will cause the voltage drop of the output of the second branch B, and the energy flow in the first branch A and the second branch B is as shown in FIG. 13; when the output line switch of the first branch A is turned off, the output fault is cleared, and the output energy is all transferred to the second branch B, the voltage of the second branch B is restored, and the power supply system operates normally.

[0085] To verify the switching process provided by the power supply system of the embodiment of the present disclosure, a single module of the power supply system is simulated, and the simulation parameters include a power supply system with a main power supply unit and a backup power supply unit of 240V, a rated voltage of 267V, and a working voltage range of 200V-288V.

[0086] FIG. 14 is a simulation diagram of the voltage waveform of the first branch A when the second branch B of the power supply system provided by the embodiment of the present disclosure has an open circuit fault; in the diagram, the horizontal coordinate represents time ms, and the vertical coordinate represents voltage V. As shown in FIG. 14, when the second branch B has an open circuit fault, the voltage of the first branch A is lifted, and the highest voltage is 270V, which meets the requirement of the power unit on power quality, indicating that the open circuit fault of the second branch B has no effect on the first branch A.

[0087] FIG. 15 is a diagram of the voltage waveform of the first branch A when the bus of the second branch B of the power supply system provided by the embodiment of the present disclosure has a short circuit, wherein the horizontal coordinate represents time ms, and the vertical coordinate represents voltage V. As shown in FIG. 15, when the second branch B has a short circuit fault, the voltage of the first branch A rises, and the highest voltage is 275V, and then continuously decreases to 230V, and the related voltage fluctuation meets the voltage range requirement of the data center.

[0088] In the embodiment of the present disclosure, the power unit includes but is not limited to the server of the data center.

[0089] The power supply system provided by the present disclosure, each main power supply unit provides power for at least two power units, and each power unit obtains power from at least two main power supply units. For the main power supply device, each main power supply unit can supply power to multiple power units, which improves the utilization rate of the power unit and reduces the cost of the power supply system; for the power unit, each power unit realizes multi-path main power supply unit power supply, which improves the reliability of the power supply system, and when the main power supply device fails, the backup power supply unit can also provide power for the power unit, further improving the reliability of the power unit. In addition, since each power unit can have multiple main power supply units and a backup power supply unit for power supply, the failure rate of power supply can be reduced, and the possibility of non-stop operation and maintenance can be improved to some extent.

[0090] Example embodiments have been disclosed herein and, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation. In some instances, it will be apparent to those skilled in the art that features, characteristics or / and elements described in connection with a particular embodiment can be used in conjunction with other embodiments unless otherwise explicitly stated. Accordingly, it will be understood that various changes in form and details can be made without departing from the scope of the disclosure as set forth in the appended claims.

Claims

1. A power supply system for providing electrical energy to multiple power-consuming units, the power supply system comprising: Multiple main power supply units, each of the main power supply units is used to provide power to at least two power consumption units, and each power consumption unit obtains power from at least two of the main power supply units; A backup power supply unit is used to provide a common backup power supply for the multiple main power supply units.

2. The power supply system according to claim 1, wherein, The primary power supply unit provides power to the at least two power consumption units in an average load manner.

3. The power supply system according to claim 1 or 2, wherein, Any one of the plurality of main power supply units provides power to two adjacent power consumption units among the at least two power consumption units; Each of the at least two power-consuming units obtains electrical energy from two adjacent main power supply units among the plurality of main power supply units.

4. The power supply system according to any one of claims 1 to 3, wherein, The power consumption unit includes a first branch and a second branch; The main power supply unit includes at least a first output terminal and a second output terminal. The first output terminal of the main power supply unit is electrically connected to the second branch of one of the power-consuming units, and the second output terminal of the main power supply unit is electrically connected to the first branch of another power-consuming unit. The backup power supply unit includes at least a first output terminal and a second output terminal. The first output terminal of the backup power supply unit is electrically connected to the first branch of all the power-consuming units in the plurality of power-consuming units, and the second output terminal of the backup power supply unit is electrically connected to the second branch of all the power-consuming units in the plurality of power-consuming units.

5. The power supply system according to claim 4, wherein, The power supply system also includes a first control switch; The first control switch is connected in series between the first output terminal of the backup power supply unit and the first branch of each of the power consumption units. The first control switch is connected in series between the second output terminal of the backup power supply unit and the second branch of each of the power-consuming units.

6. The power supply system according to any one of claims 1 to 5, wherein, The power supply system further includes a second control switch, with each main power supply unit connected in series with the power source; the backup power supply unit is connected in series with the power source via the second control switch.

7. The power supply system according to claim 1, wherein, The main power supply unit includes a solid-state transformer, the first input terminal of which is electrically connected to the first output terminal of the power supply, and the second input terminal of which is electrically connected to the second output terminal of the power supply. The solid-state transformer includes at least two output ports, each of which is an independent output port, and each output port is electrically connected to one of the power-consuming units.

8. The power supply system according to claim 7, wherein, The main power supply unit further includes a rectifier module, the first input terminal of which is electrically connected to the first output terminal of the power supply, and the second input terminal of which is electrically connected to the second output terminal of the power supply; the first output terminal of the rectifier module is electrically connected to the first input terminal of the solid-state transformer, and the second output terminal of the rectifier module is electrically connected to the second input terminal of the solid-state transformer.

9. The power supply system according to claim 8, wherein, The rectifier module includes an input inductor and an input bridge; The first end of the input inductor is electrically connected to the first output terminal of the power supply, the second end of the input inductor is electrically connected to the first input terminal of the input bridge, and the second input terminal of the input bridge is electrically connected to the second output terminal of the power supply. The first output terminal of the input bridge is electrically connected to the first input terminal of the solid-state transformer, and the second output terminal of the input bridge is electrically connected to the second input terminal of the solid-state transformer.

10. The power supply system according to any one of claims 1 to 9, wherein, The power supply system also includes: A power supply, which is electrically connected to the input terminal of the main power supply unit; A battery pack is electrically connected to the input terminal of the power-consuming unit, and the battery pack provides power to the power-consuming unit in the event of a power outage.

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