CN218472832U - Power supply system - Google Patents

Abstract

The present disclosure provides a power supply system including: a first power supply; a second power supply; the first alternating current bus is electrically connected to the first power supply through a first switch; and a second ac bus electrically connected to the first ac bus through a second switch, and the second ac bus electrically connected to a second power supply through a third switch.

Description

Power supply system

Technical Field

The present disclosure relates to the field of power supply technologies, and in particular, to a power supply system.

Background

With the development of society, the demand for stable and environmentally friendly power supply is increasing. For example, in application scenarios such as a data center, since the data volume is increasing explosively and data applications have penetrated aspects of production and life, the data center, as a carrier for data calculation and storage, often consumes a great amount of power and has a high requirement on stability during operation. In this case, how to simply and rapidly use reliable and green energy becomes a big problem.

SUMMERY OF THE UTILITY MODEL

According to an aspect of the embodiments of the present disclosure, there is provided a power supply system including: a first power supply; a second power supply; a first AC bus electrically connected to the first power supply through a first switch; and a second ac bus electrically connected to the first ac bus through a second switch, and the second ac bus is electrically connected to the second power supply through a third switch.

In some embodiments, the first power supply comprises mains power; and/or the second power supply includes at least one of a hydrogen power generation device, a solar power generation device, a wind power generation device, a hydro-energy power generation device, a bio-energy power generation device, and a geothermal energy power generation device.

In some embodiments, the mains comprises at least two mains output lines.

In some embodiments, in a case where the second power supply can operate normally, the second switch is configured to be open, and the third switch is configured to be closed to be supplied with power by the second power supply.

In some embodiments, in the event of an abnormality in the second power supply, the first switch and the second switch are configured to be closed and the third switch is configured to be open for power supply by the first power supply.

In some embodiments, the power supply system further comprises: a third power supply, wherein the first AC bus is electrically connected to the third power supply through a fourth switch.

In some embodiments, the third power supply source comprises a diesel power plant.

In some embodiments, in a case where the second power supply can normally operate, the first switch and the third switch are configured to be closed, and the second switch and the fourth switch are configured to be opened, to be supplied with power by the second power supply.

In some embodiments, in the case where the second power supply source is abnormal and the first power supply source can normally operate, the first switch and the second switch are configured to be closed, and the third switch and the fourth switch are configured to be opened, so as to be supplied with power by the first power supply source.

In some embodiments, in the case where both the first power supply source and the second power supply source are abnormal, the first switch and the third switch are configured to be opened, and the second switch and the fourth switch are configured to be closed to be supplied with power by the third power supply source.

In some embodiments, the power supply system includes a plurality of second ac busbars, a plurality of second switches, a plurality of third switches, and a plurality of second power supplies, wherein each of the second ac busbars is electrically connected to the first ac busbar through the corresponding second switch, and each of the second ac busbars is electrically connected to the corresponding second power supply through the corresponding third switch.

In some embodiments, the power capacity of the second power supply is configured to be comparable to a full load power capacity of a load powered by the power supply system.

In some embodiments, the power supply system is configured for supplying power to a data center.

The technical solution of the present disclosure is further described in detail by the accompanying drawings and embodiments.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 (a) shows a schematic structural diagram of a power supply system;

fig. 1 (b) shows a schematic configuration of another power supply system;

FIG. 2 is a schematic block diagram of a power supply system according to an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic block diagram of a power supply system according to another exemplary embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a power supply system according to yet another exemplary embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a power supply system according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the embodiments described are only some embodiments of the present disclosure, rather than all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In addition, in the description of the present disclosure, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or order.

As shown in fig. 1 (a), in a conventional power supply system, an ac bus may be connected to a commercial power supply and a backup power supply through respective switches. Normally, the switch connected to the mains is closed and the switch connected to the backup power supply is open, so that the load is supplied by the mains; and when the commercial power is abnormal or the commercial power is repaired and the power cannot be normally supplied, the switch connected to the commercial power is disconnected, and the switch connected to the standby power supply is closed, so that the standby power supply supplies power to the load.

In recent years, with the development of technologies such as clean energy, it is possible to use other types of energy to participate in the power supply to the load. As shown in fig. 1 (b), in one power supply system, an additional power supply may be added on the basis of the conventional power supply system, and this power supply may be connected to the ac bus via a corresponding switch. In some cases, the power supply may include a clean energy power generation device to provide clean, environmentally friendly power to the load. In addition, because three parallel power supplies exist in the power supply system, under the condition that any one or two power supplies are in fault, the power supply system can be switched to other power supplies capable of normally running to supply power to the load, so that the reliability of power supply is improved.

However, in the power supply system shown in fig. 1 (b), since the newly added power supply is directly incorporated into the main bus, it is required to perform the capacity deployment at once. Correspondingly, the main bus needs to be transformed into an electric cabinet during construction, and the requirement on field conditions is high. In addition, in the power supply system shown in fig. 1 (b), in order to maintain the availability of the system, it is necessary to maintain a 2N capacity (here, 1N capacity represents the full-load power capacity of the load, and 2N represents the full-load power capacity of twice the load) configuration, which may cause the load factor of the newly added power supply to be at an excessively low level for a long period of time, which is disadvantageous to, for example, efficient use of clean energy. In addition, under the condition that the capacity of the newly added power supply is large, the access mode of the power supply can also cause the risk that the electric power generated by the power supply is returned to the commercial power grid, and the risk is not favorable for the stable operation of the power grid.

In order to solve the above problems, the present disclosure provides a power supply system, which can implement flexible deployment of power supplies by adopting a distributed architecture and a modular design, has a small modification demand on the existing electric cabinet and is simple in construction, and can adapt to various power supply situations by combining a switch arranged in the power supply system, and improve the load factor of a certain power supply (for example, a power supply based on clean energy power generation) as much as possible, thereby implementing stable and environment-friendly power supply.

Fig. 2 shows a schematic structural diagram of a power supply system 200 according to an exemplary embodiment of the present disclosure. The power supply system 200 may include a first power supply 201, a second power supply 202, a first switch 211, a second switch 212, a third switch 213, a first ac bus 221, and a second ac bus 222. As shown in fig. 2, the first power supply 201 may be electrically connected to the first ac bus 221 through the first switch 211, the first ac bus 221 may be electrically connected to the second ac bus 222 through the second switch 212, and the second power supply 202 may be electrically connected to the second ac bus 222 through the third switch 213. The second ac bus 222 of the power supply system 200 may be configured to be connected to a load 230 to enable power supply to the load 230.

In some embodiments, considering that the second power supply 202 can be connected to the second ac bus 222 supplying power to the load through only one switch, and the first power supply 201 needs to be connected to the second ac bus 222 supplying power to the load through two switches, in order to shorten the circuit path and avoid the occurrence of a fault as much as possible, the second power supply 202 can be used as the power supply most commonly used for supplying power to the load. In other words, it is desirable that the power supply most commonly used for supplying power to the load be provided at the position of the second power supply 202 shown in fig. 2.

In some embodiments, in order to reduce carbon emissions as much as possible to protect the environment, the second power supply 202 may include a clean energy based power generation device, for example, may include at least one of a hydrogen power generation device, a solar power generation device, a wind power generation device, a hydro power generation device, a bio power generation device, and a geothermal power generation device. In practice, the most suitable clean energy power generation device may be selected according to the specific conditions of the load receiving power supply (e.g., the clean energy distribution at the load site, etc.). In particular, the hydrogen power generation device is less limited by objective environment, has the characteristics of zero carbon, no environmental pollution, renewability and the like, and is called as an ultimate green energy source. In addition, with the continuous development of hydrogen power generation technology, it is now possible to use it in a large load 230 such as a data center. Therefore, a hydrogen energy power generation device can be used as a preferable second power supply 202. However, it is understood that in other embodiments, the second power supply 202 may be other types of power supplies according to actual needs.

Furthermore, in order to utilize the power generated by the second power supply 202 as efficiently and fully as possible, the corresponding second power supply 202 may be selected according to the full-load power capacity of the load 230. In a particular example, the power capacity of the second power supply 202 may be configured to be comparable to the full load power capacity of the load 230. Here, "comparable" means that the power capacity of the second power supply 202 is equal to or slightly greater than the full-load power capacity of the load 230, so as to avoid the low load rate of the second power supply 202 caused by excessive redundancy of the power capacity of the second power supply 202. In this way, under the condition that the second power supply 202 can operate normally, the second power supply 202 can fulfill the requirement of supplying power to the load as much as possible.

The first power supply 201 can supply power to the load when the second power supply 202 cannot meet the power supply requirement. In some embodiments, the first power supply 201 may include mains power, which is generally easily accessible and in most cases has high stability. However, it is understood that in other embodiments, the first power supply 201 may be other types of power supplies according to actual needs.

Further, in some embodiments, the mains may comprise at least two mains output lines. Therefore, under the condition that one of the commercial power output lines is abnormal or overhauled, other commercial power output lines can be used for supplying power, and continuous power supply is further guaranteed.

In some embodiments, the first ac bus 221 and the second ac bus 222 may be provided according to a power supply source connected thereto. In a specific example, the first ac bus 221 may be a 10kV bus and the second ac bus 222 may be a 10kV or 400V bus.

Further, in general, the ac busbar may have two input terminals and one output terminal. Therefore, a common alternating current bus bar may be used as the first alternating current bus bar 221 and the second alternating current bus bar 222 shown in fig. 2, in which one input terminal of the first alternating current bus bar 221 may be left vacant. In this way, the implementation of the power supply system in the embodiment shown in fig. 2 does not require additional modifications to the existing electrical cabinet, as compared to the ac bus shown in fig. 1 (b) that includes three input terminals, thereby contributing to reduced deployment costs and increased deployment flexibility.

In some embodiments, the opening or closing of the various switches may be switched according to the following conditions to achieve reliable and clean power supply to the load 230 with the power supply system 200 shown in fig. 2.

Specifically, in the case where the second power supply 202 can normally operate, the second switch 212 is configured to be open, and the third switch 213 is configured to be closed, so as to supply power from the second power supply 202 while avoiding interference with the power supply by the first power supply 201.

Furthermore, in some embodiments, the first switch 211 may also be configured to be closed in case the second power supply 202 is able to operate normally. In this way, if the second power supply 202 suddenly becomes abnormal and cannot supply power, the first power supply 201 can quickly switch to supply power to the load 230 only by switching the second switch 212 from open to closed, so that adverse effects caused by the power failure of the second power supply 202 can be reduced as much as possible. However, in other embodiments, the first switch 211 may be configured to be turned off when the second power supply 202 can normally operate, for example, in consideration of safety. This effectively prevents the second switch 212 from being closed by mistake, which may adversely affect the circuit.

In addition, in the case where an abnormality occurs in the second power supply source 202, the first switch 211 and the second switch 212 are configured to be closed, and the third switch 213 is configured to be opened to supply power by the first power supply source 201. Thus, in the case of a possible sudden situation of the second power supply 202, the appropriate power supply can be selected simply and quickly by switching between the corresponding switches to supply power, thereby ensuring continuous power supply.

In some embodiments, in addition to the second switch 212 being operable in conjunction with the first switch 211 to connect the first power supply 201 to the second ac bus 222, the second switch 212 may be opened to prevent the power generated by the second power supply 202 from being returned to the first ac bus 221 in the event that the second power supply 202 is generating power normally, thereby helping to maintain the stability of the utility grid on which the first power supply 201 is located.

In another exemplary embodiment of the present disclosure, as shown in fig. 3, the power supply system 300 may include a first power supply 301, a plurality of second power supplies 302, 303, a first switch 311, a plurality of second switches 312, 313, a plurality of third switches 314, 315, a first ac bus 321, and a plurality of second ac buses 322, 323. Among them, the first power supply 301 may be electrically connected to the first alternating-current bus 321 through the first switch 311, the first alternating-current bus 321 may be electrically connected to the corresponding second alternating-current bus through the corresponding second switch, respectively (i.e., the first alternating-current bus 321 is electrically connected to the second alternating-current bus 322 through the second switch 312, and the first alternating-current bus 321 is electrically connected to the second alternating-current bus 323 through the second switch 313), and each second power supply may be electrically connected to the corresponding second alternating-current bus through the corresponding third switch, respectively (i.e., the second power supply 302 is electrically connected to the second alternating-current bus 322 through the third switch 314, and the second power supply 303 is electrically connected to the second alternating-current bus 323 through the third switch 315). Each of the second ac busbars of the power supply system may be configured to be respectively connected to a corresponding load (i.e., the second ac busbar 322 may be configured to be connected to the load 331, and the second ac busbar 323 may be configured to be connected to the load 332), thereby enabling power supply to a plurality of loads.

Similarly, in the case where the second power supply can operate normally, the second switch corresponding to the second power supply may be configured to be open, and the corresponding third switch may be configured to be closed, so as to supply power to the corresponding load by the second power supply.

Furthermore, in some embodiments, the first switch 311 may also be configured to be closed in case the second power supply can operate normally. Therefore, if one or more second power supplies suddenly generate abnormity and cannot supply power, the one or more second switches corresponding to the abnormal second power supplies are switched from off to on, and the first power supply 301 can be quickly switched to supply power to the corresponding loads, so that adverse effects caused by power failure of the second power supplies can be reduced as much as possible. However, in other embodiments, the first switch 311 may be configured to be turned off when the second power supply can operate normally, for example, in consideration of safety. Therefore, the adverse effect on the circuit caused by the fact that the second switch is closed by mistake can be effectively avoided.

If an abnormality occurs in one or more of the plurality of second power supplies, the first switch 311 is configured to be closed, and the second switch corresponding to the abnormal second power supply is configured to be closed, and the corresponding third switch is configured to be opened, so that the first power supply 301 can supply power to one or more loads corresponding to the abnormal second power supply. Furthermore, if one or more second power supplies still can be operated normally are present in the plurality of second power supplies, the third switch corresponding to such second power supplies remains closed and the corresponding second switch remains open, i.e. the respective load is still supplied by the second power supply.

In the specific embodiment shown in fig. 3, in the case where the second power supply 302 cannot normally operate and the second power supply 303 can normally operate, the first switch 311, the second switch 312, and the third switch 315 are configured to be closed, and the second switch 313 and the third switch 314 are configured to be opened, so that the load 331 is supplied with power by the first power supply 301 and the load 332 is supplied with power by the second power supply 303.

It can be understood that, under the condition that the second power supply 303 cannot normally operate and the second power supply 302 can normally operate, the states of the switches can be correspondingly switched, so that the first power supply 301 supplies power to the load 332 and the second power supply 302 supplies power to the load 331, which is not described herein again.

In the case where neither the second power supply 302 nor the second power supply 303 can operate normally, the first switch 311, the second switch 312, and the second switch 313 are configured to be closed, and the third switch 314 and the third switch 315 are configured to be opened, to supply power to the load 331 and the load 332, respectively, by the first power supply 301.

Therefore, under the condition that a plurality of second alternating-current buses exist, in the case of a possible emergency situation of the first power supply and the second power supply, the proper power supply can be flexibly selected from the plurality of power supplies through switching among the plurality of switches to supply power, so that continuous power supply is guaranteed.

In yet another exemplary embodiment of the present disclosure, as shown in fig. 4, the power supply system 400 may include a first power supply 401, a second power supply 402, a third power supply 403, a first switch 411, a second switch 412, a third switch 413, a fourth switch 414, a first ac bus 421, and a second ac bus 422. Among them, the first power supply 401 may be electrically connected to the first ac bus 421 through the first switch 411, the third power supply 403 may be electrically connected to the first ac bus 421 through the fourth switch 414, the first ac bus 421 may be electrically connected to the second ac bus 422 through the second switch 412, and the second power supply 402 may be electrically connected to the second ac bus 422 through the third switch 413. The second ac bus 422 of the power supply system 400 may be configured to be connected to a load 430, thereby enabling power supply to the load 430.

As described above, the first power supply 401 may include utility power; the second power supply 402 may include a clean energy-based power generation device, and may include at least one of a hydrogen power generation device, a solar power generation device, a wind power generation device, a hydro power generation device, a bio power generation device, and a geothermal power generation device, for example. In addition, the third power supply 403 may serve as a backup power supply, which may include a diesel power generator or other power generation device. However, it is understood that the third power supply 403 may comprise other types of power supplies according to actual needs.

Similarly, the first ac bus 221 and the second ac bus 222 may be provided according to the power supply source connected thereto. In a specific example, the first ac bus 221 may be a 10kV bus and the second ac bus 222 may be a 10kV or 400V bus. Further, in general, the ac busbar may have two input terminals and one output terminal.

In some embodiments, the opening or closing of the various switches may be switched depending on the following conditions to achieve a reliable and clean power supply to the load 430.

Specifically, in the case where the second power supply 402 can normally operate, the first switch 411 and the third switch 413 may be configured to be closed, and the second switch 412 and the fourth switch 414 may be configured to be opened to be supplied with power by the second power supply 402. Also, since the first switch 411 is in a closed state, if an abnormality occurs in the second power supply 402, it is possible to help quickly switch to the supply of power by the first power supply 401.

Further, in the case where an abnormality occurs in the second power supply 402 and the first power supply 401 can normally operate, the first switch 411 and the second switch 412 may be configured to be closed, and the third switch 413 and the fourth switch 414 may be configured to be opened to supply power from the first power supply 401.

Further, in the case where an abnormality occurs in both the first power supply source 401 and the second power supply source 402, the first switch 411 and the third switch 413 may be configured to be open, and the second switch 412 and the fourth switch 414 may be configured to be closed to be supplied with power from the third power supply source 403 as a backup power source.

In this way, in the case where the first power supply 401 and the second power supply 402 may have a sudden situation or may not have a sudden situation at the same time, the appropriate power supply can be flexibly selected from the three power supplies to supply power by switching among the switches, so as to ensure continuous power supply.

It is understood that a plurality of second ac busbars, a plurality of second switches, a plurality of third switches, and a plurality of second power supplies may be provided on the basis of the exemplary embodiment shown in fig. 4. Each second ac bus is electrically connected to the first ac bus through a corresponding second switch, each second ac bus is electrically connected to a corresponding second power supply through a corresponding third switch, and the plurality of second ac buses may be configured to respectively supply power to the plurality of loads. In a case where the second power supply can operate normally, the second switch corresponding to the second power supply may be configured to be open, and the corresponding third switch may be configured to be closed to supply power to the corresponding load by the second power supply. When one or more of the second power supplies are abnormal, the second switch corresponding to the abnormal second power supply is configured to be closed, the corresponding third switch is configured to be opened, and the first switch is closed and the fourth switch is opened under the condition that the first power supply is normal, so that the first power supply can supply power for one or more loads corresponding to the abnormal second power supply; and when the first power supply source is abnormal, the first switch is opened, and the fourth switch is closed, so that the third power supply source can supply power to one or more loads corresponding to the abnormal second power supply source. In addition, if there are one or more second power supplies that are still capable of operating normally in the plurality of second power supplies, the third switch corresponding to such second power supplies remains closed and the corresponding second switch remains open, i.e. the respective load is still supplied by the second power supply.

Next, a power supply system according to a specific embodiment of the present disclosure will be described with reference to fig. 5. Here, the switch DA1 and the switch DA2 are in an electrical interlock state, and the switch DH1 and the switch DH2 are also in an electrical interlock state.

The power supply system shown in fig. 5 includes commercial power (first power supply), a hydrogen energy power generation device (second power supply), a backup power supply (third power supply), a switch DA1 (first switch), a DH1 (second switch), a DH2 (third switch), a DA2 (fourth switch), an ac bus 1 (first ac bus), and an ac bus 2 (second ac bus). The power supply system is configured to supply power to a load.

Next, six cases and corresponding processing modes mainly encountered by the power supply system in operation will be described.

Case 1: normal operation

Processing mode 1: under the condition that the power supply system normally operates, the power supply system is supplied with power by the hydrogen power generation device, and the commercial power supply and the standby power supply are both in standby states. At this time, the switch DA1 is closed, the switch DA2 is opened, the switch DH1 is opened, and the switch DH2 is closed.

Case 2: failure of hydrogen power generation device

Processing mode 2: when the hydrogen energy power generation device fails, the switch DH2 is opened, the switch DH1 is closed, and the load is supplied by the main utility power supply.

Case 3: the hydrogen energy power generation device firstly fails and then the commercial power fails

Processing mode 3: if the situation that the commercial power is cut off occurs after the situation 2 occurs, the standby power supply needs to be started for supplying power, at the moment, the switch DH1 is disconnected, the switch DH2 is disconnected, and the switch DA1 is disconnected, until the standby power supply is started, the switch DA2 is closed, and the switch DH1 is closed.

Case 4: commercial power cut

Processing mode 4: under the condition of commercial power failure, the load can still be supplied with power by the hydrogen power generation device. At this time, the switch DA1 is closed, the switch DA2 is opened, the switch DH1 is opened, and the switch DH2 is closed.

Case 5: the utility power is cut off first, and then the hydrogen energy power generation device fails

Processing mode 5: if a failure occurs in the hydrogen energy power generation device after the occurrence of the condition 4, the backup power supply needs to be started, and at this time, the switch DH1 is opened, the switch DH2 is opened, and the switch DA1 is opened, until the backup power supply is started, the switch DA2 is closed, and the switch DH1 is closed.

Case 6: load increase beyond hydrogen energy supply capacity under normal operation

Processing mode 6: if the load increases to exceed the hydrogen energy power supply capacity after the condition 1, the commercial power supply needs to be started, and at this time, the switch DH2 is opened, and the switches DH1 and DA1 are closed.

In the power supply system of the present disclosure, under different circumstances, a suitable power supply source can be flexibly selected to supply power to a load by switching among a plurality of switches, so as to ensure continuous power supply. Moreover, the power supply system disclosed by the invention adopts a distributed architecture and a modular design, and two input terminals and one output terminal can be arranged on each bus under some conditions, and the structure of the power supply system is consistent with that of the existing bus terminal, so that the demand on the transformation of the existing electric cabinet is less, and the construction is simple during actual deployment. The distributed architecture and the modular design can also realize the staged flexible deployment by taking the actual transformer capacity as the minimum granularity. Through the framework and the corresponding power supply strategy, a second power supply source of the clean energy power generation device can be ensured to be used as a main power supply source during daily power supply, so that carbon emission is reduced, and the environment is protected. When the second power supply fails, the first power supply such as commercial power or the second power supply such as a standby power is switched to, so that the power supply stability of the end load can be effectively guaranteed. Moreover, the power supply system of the present disclosure, through the switch and the distributed structure, does not risk the system to return power to the first power supply, e.g., the utility grid, when the second power supply is used. In addition, the use requirement of the load can be met without configuring the capacity to be 2N.

In the present specification, the embodiments are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same or similar parts in each embodiment are referred to each other.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (13)

1. A power supply system, characterized in that the power supply system comprises:

a first power supply;

a second power supply;

a first AC bus electrically connected to the first power supply through a first switch; and

a second AC bus electrically connected to the first AC bus through a second switch, and the second AC bus electrically connected to the second power supply through a third switch.

2. The power supply system of claim 1, wherein the first power supply comprises utility power; and/or

The second power supply includes at least one of a hydrogen power generation device, a solar power generation device, a wind power generation device, a hydro-energy power generation device, a bio-energy power generation device, and a geothermal energy power generation device.

3. The power supply system of claim 2, wherein the utility power comprises at least two utility power output lines.

4. The power supply system of claim 1, wherein in a case where the second power supply is capable of normal operation, the second switch is configured to be open and the third switch is configured to be closed to be powered by the second power supply.

5. The power supply system according to claim 1, wherein in the event of an abnormality in the second power supply source, the first switch and the second switch are configured to be closed, and the third switch is configured to be opened to supply power from the first power supply source.

6. The power supply system of claim 1, further comprising:

a third power supply, wherein the first AC bus is electrically connected to the third power supply through a fourth switch.

7. The power supply system of claim 6, wherein the third power supply source comprises a diesel power generation device.

8. The power supply system of claim 6, wherein in a case where the second power supply is capable of normal operation, the first switch and the third switch are configured to be closed, and the second switch and the fourth switch are configured to be open for power supply by the second power supply.

9. The power supply system according to claim 6, wherein in a case where an abnormality occurs in the second power supply and the first power supply can normally operate, the first switch and the second switch are configured to be closed, and the third switch and the fourth switch are configured to be opened to supply power from the first power supply.

10. The power supply system according to claim 6, wherein in the case where an abnormality occurs in both the first power supply source and the second power supply source, the first switch and the third switch are configured to be open, and the second switch and the fourth switch are configured to be closed to supply power from the third power supply source.

11. The power supply system of claim 1, wherein the power supply system comprises a plurality of second ac busbars, a plurality of second switches, a plurality of third switches, and a plurality of second power supplies, wherein each second ac busbar is electrically connected to the first ac busbar through a corresponding second switch, and each second ac busbar is electrically connected to a corresponding second power supply through a corresponding third switch.

12. The power supply system of claim 1, wherein the power capacity of the second power supply source is configured to be comparable to a full capacity of a load powered by the power supply system.

13. The power supply system of claim 1, wherein the power supply system is configured for powering a data center.

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