Power supply system

Abstract

The invention discloses a power supply system, relates to the field of power supply control, and aims to improve the power supply stability of the power supply system. The power supply system comprises two identical sub power supply systems. The input end of the sub-power supply system is connected with a power grid, the sub-power supply system comprises a plurality of power supply links, the output ends of the plurality of power supply links are connected with a plurality of electric devices in a one-to-one correspondence manner, and the sub-system is configured to convert voltage provided by the power grid into voltage adaptive to the electric devices through the power supply links and transmit the voltage to the electric devices. And the power supply links in the two sub power supply systems connected with the same electric equipment are connected through a bypass branch. Each electric device has two power supply inputs, and the power supply links in the two sub-power supply systems connected with the same electric device are connected through the bypass branch, so that when any one power supply link fails, one power supply link can still supply power to the electric device; therefore, the power supply reliability and stability of the power supply system are ensured.

Description

Technical Field

[0001] The present invention relates to the field of power supply control, and in particular to a power supply system. Background Art

[0002] A data center is a facility that centrally houses, manages, and maintains a large number of computer systems, storage devices, and network devices. It is usually used to store, process, and distribute large amounts of data, and provides high availability, security, and scalability services.

[0003] The power supply of existing data centers usually adopts USP system based on power frequency transformer, or high voltage DC system based on power frequency transformer. With the substantial increase of power density of IT cabinets, USP system based on power frequency transformer or high voltage DC system is difficult to adapt to the high power supply demand, the frequency of failure is gradually increasing, and the stability of power supply system is greatly affected. Summary of the invention

[0004] An embodiment of the present invention provides a power supply system, aiming to improve the stability of power supply of the power supply system.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] The power supply system provided in the present application includes two identical sub-power supply systems. The input end of the sub-power supply system is connected to the power grid, and the sub-power supply system includes multiple power supply links. The output ends of the multiple power supply links are connected to multiple power-consuming devices in a one-to-one correspondence. The sub-system is configured to: convert the voltage provided by the power grid into a voltage adapted to the power-consuming device through the power supply link and transmit it to the power-consuming device. The power supply links in the two sub-power supply systems connected to the same power-consuming device are connected through a bypass branch.

[0007] The input end of the sub-power supply system is connected to the power grid to obtain the voltage of the power grid. The sub-power supply system converts the voltage provided by the power grid, usually high-voltage alternating current, into the voltage required by the power equipment, such as IT cabinets, through the power supply link. The sub-power supply system includes multiple power supply links, and the output end of each power supply link is connected to an electric device to provide a voltage output for the electric device. Since the power supply system provided in the present application includes two sub-power supply systems, the other sub-power supply system also includes multiple power supply links, and the output end of each power supply link is also connected to an electric device to provide a voltage output for the connected electric device, so that an electric device can obtain two power supply inputs. Since each electric device has two power supply inputs, and the power supply links in the two sub-power supply systems connected to the same electric device are connected through a bypass branch, when any power supply link fails, there is still a power supply link that can supply power to the electric device, so the power supply reliability and stability of the power supply system are guaranteed.

[0008] As a possible implementation, the sub-power supply system includes: a power electronic transformer, at least one DC distribution circuit and a plurality of low-voltage conversion circuits. The input end of the power electronic transformer is connected to the input end of the sub-power supply system, and the power electronic transformer is configured to convert the AC voltage provided by the power grid into a first DC voltage. At least one DC distribution circuit is connected to the output end of the power electronic transformer, and the DC distribution circuit includes a plurality of parallel power supply branches, the first ends of the plurality of power supply branches are all connected to the input end of the DC distribution circuit, and the second ends of different power supply branches are connected one-to-one with the plurality of output ends of the DC distribution circuit. The DC distribution circuit is configured to distribute the first DC voltage to each power supply branch. The input ends of the plurality of low-voltage conversion circuits are connected one-to-one with the plurality of power supply branches, and the output ends of the plurality of low-voltage conversion circuits are connected one-to-one with the plurality of electrical devices. The low-voltage conversion circuit is configured to convert the first DC voltage into a second DC voltage required by the electrical device. The power supply link includes a power supply branch and a low-voltage conversion circuit connected to the power supply branch.

[0009] As a possible implementation, in the case where the electrical equipment is integrated with a DC-DC transformer, the sub-power supply system includes: a power electronic transformer and at least one DC distribution circuit. The input end of the power electronic transformer is connected to the input end of the sub-power supply system, and the power electronic transformer is configured to convert the AC voltage provided by the power grid into a first DC voltage. At least one DC distribution circuit is connected to the output end of the power electronic transformer, and the DC distribution circuit includes multiple parallel power supply branches, the first ends of the multiple power supply branches are all connected to the input end of the DC distribution circuit, and the second ends of different power supply branches are connected one by one to multiple output ends of the DC distribution circuit. The DC distribution circuit is configured to distribute the first DC voltage to each power supply branch. One output end of the DC distribution circuit is connected to an electrical equipment through a first circuit breaker.

[0010] As a possible implementation method, the DC distribution circuit includes multiple second circuit breakers, which are arranged on multiple power supply branches, and the multiple second circuit breakers correspond one-to-one to the multiple power supply branches, one end of the second circuit breaker is connected to the first end of the power supply branch, and the other end of the second circuit breaker is connected to the second end of the power supply branch.

[0011] As a possible implementation, the low voltage conversion circuit includes a third circuit breaker and a DC-DC transformer. One end of the third circuit breaker is connected to the input end of the low voltage conversion circuit, the other end of the third circuit breaker is connected to the input end of the DC-DC transformer, and the output end of the DC-DC transformer is connected to the output end of the low voltage conversion circuit.

[0012] As a possible implementation manner, the low voltage conversion circuit further includes a first fuse, and the first fuse is arranged between the output end of the DC-DC transformer and the output end of the low voltage conversion circuit.

[0013] As a possible implementation, the two identical sub-power supply systems include a first power supply sub-system and a second power supply sub-system. The bypass branch includes a fourth circuit breaker, one end of the fourth circuit breaker is connected to the DC distribution circuit of the first power supply sub-system, and the other end of the fourth circuit breaker is connected to the DC distribution circuit of the second power supply sub-system.

[0014] As a possible implementation, the DC distribution circuit further includes a backup branch, a first end of the backup branch is connected to an input end of the DC distribution circuit, and a second end of the backup branch is connected to at least one storage battery. The output end of the power electronic transformer is connected to the input end of the DC distribution circuit via a fifth circuit breaker.

[0015] As a possible implementation manner, a second fuse is further connected between the second end of the standby branch and the battery.

[0016] As a possible implementation, the sub-power supply system also includes an electronic switch. The input end of the electronic switch is connected to the output end of the power electronic transformer, and the output end of the electronic switch is connected to the DC distribution circuit through the fifth circuit breaker. The power electronic transformer includes a first output end and a second output end. The fifth circuit breaker includes a first input end and a second input end. The electronic switch includes a first switch tube, a second switch tube, a first diode, a second diode and a capacitor. The first pole of the first switch tube is connected to the first input end of the electronic switch, the second pole of the first switch tube is connected to the first output end of the electronic switch, the first pole of the second switch tube is connected to the first output end of the electronic switch, and the second pole of the second switch tube is connected to the second output end of the electronic switch. The positive pole of the first diode is connected to the second pole of the first switch tube, and the negative pole of the first diode is connected to the first pole of the first switch tube. The positive pole of the second diode is connected to the second pole of the second switch tube, and the negative pole of the second diode is connected to the first pole of the second switch tube. The first input end of the electronic switch is connected to the first output end of the power electronic transformer, the second input end of the electronic switch is connected to the second output end of the power electronic transformer, the first output end of the electronic switch is connected to the first input end of the fifth circuit breaker, and the second output end of the electronic switch is connected to the second input end of the fifth circuit breaker. One end of the capacitor is connected to the second electrode of the first switch tube, and the other end of the capacitor is connected to the first output end of the electronic switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a power supply system provided in an embodiment of the present application;

[0018] Figure 2A schematic diagram of the internal composition of a power supply system provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of the internal composition of another power supply system provided in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of the internal composition of another power supply system provided in an embodiment of the present application;

[0021] Figure 5 A schematic diagram of the internal composition of another power supply system provided in an embodiment of the present application;

[0022] Figure 6 A schematic diagram of the internal composition of another power supply system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] A data center is a facility that centrally houses, manages, and maintains a large number of computer systems, storage devices, and network devices. It is usually used to store, process, and distribute large amounts of data, and provide services with high availability, security, and scalability. The power supply of existing data centers usually uses a USP system based on an industrial frequency transformer, or a high-voltage DC system based on an industrial frequency transformer.

[0028] The USP system is mainly used to provide uninterrupted power supply to key equipment when the power supply of the power grid is interrupted. The power frequency transformer is usually used in the UPS system to convert the AC power of the power grid into DC power, and then convert the DC power into AC power to meet the needs of the power-consuming equipment. When the power grid is normal, the USP system will obtain power from the power grid and charge the battery at the same time. When the power supply of the power grid is interrupted, the UPS system will immediately switch to battery power to ensure that the power supply of the load is not interrupted.

[0029] A high-voltage direct current system is a system that uses direct current directly for power supply. It is usually used in scenarios that require high reliability and high efficiency power supply, such as data centers and communication base stations. In a high-voltage direct current system, an industrial frequency transformer is used to convert the alternating current of the power grid into high-voltage direct current. High-voltage direct current can be used directly for power supply, or converted into alternating current through an inverter.

[0030] However, as the number of cabinets in data centers increases and the power consumption of each cabinet continues to increase, the conventional USP system or high-voltage DC system based on industrial frequency transformers is difficult to adapt to the high-power power supply requirements, the frequency of failures gradually increases, and the stability of the power supply system is greatly affected.

[0031] In view of this, an embodiment of the present application provides a power supply system, exemplarily as follows Figure 1 As shown. The power supply system includes two identical sub-power supply systems 1, namely the first sub-power supply system 1A and the second sub-power supply system 1B in the figure. The input end of the sub-power supply system 1 is connected to the power grid 2, and the sub-power supply system 1 includes multiple power supply links, and the output ends of the multiple power supply links are connected to multiple power-consuming devices 3 in a one-to-one correspondence.

[0032] Figure 1The sub-power supply system 1 shown in the figure includes three power supply links, and one power supply link is connected to one power-consuming device. For the convenience of explanation, the three power supply links of the sub-power supply system 1 are respectively recorded as the first power supply link, the second power supply link and the third power supply link. That is to say, the first power supply link of the first sub-power supply system 1A is connected to the first power-consuming device 3A, and the first power supply link of the second sub-power supply system 1B is connected to the first power-consuming device 3A. The second power supply link of the first sub-power supply system 1A is connected to the second power-consuming device 3B, and the second power supply link of the second sub-power supply system 1B is connected to the second power-consuming device 3B. The third power supply link of the first sub-power supply system 1A is connected to the third power-consuming device 3C, and the third power supply link of the second sub-power supply system 1B is connected to the third power-consuming device 3C.

[0033] The sub-power supply system 1 is configured to convert the voltage provided by the power grid 2 into a voltage adapted to the power consumption device 3 through a power supply link and transmit the voltage to the power consumption device 3. The power supply links in the two sub-power supply systems connected to the same power consumption device 3 are connected through a bypass branch 4.

[0034] The input end of the sub-power supply system 1 is connected to the power grid 2 to obtain the voltage of the power grid 2. The sub-power supply system 1 converts the voltage provided by the power grid 2, usually high-voltage alternating current, into the voltage required by the power device 3, such as an IT cabinet, through a power supply link. The sub-power supply system 1 includes multiple power supply links, and the output end of each power supply link is connected to an power device 3 to provide a voltage output for the power device 3. Since the power supply system provided in the present application includes two sub-power supply systems 1, the first sub-power supply system 1A and the second sub-power supply system 1B both include multiple power supply links, and the output end of each power supply link is also connected to an power device 3 to provide a voltage output for the connected power device 3. Therefore, one power device 3 can obtain two power supply inputs.

[0035] It should be noted that the internal components of the first sub-power supply system are also part of the power supply link, and the number of power devices 3, power supply links and bypass branches 4 shown in the figure is only for example, and this application does not limit their number. Since each power device 3 has two power supply inputs, and the power supply links in the two sub-power supply systems connected to the same power device 3 are also connected through the bypass branch 4, when any power supply link fails, there is still one power supply link that can supply power to the power device 3. For example, part of the internal circuit of the first sub-power supply system 1A is broken, that is, Figure 1A circuit breaker occurs in the dotted portion exceeding the bypass branch 4 inside the first sub-power supply system 1A and the second sub-power supply system 1B, causing the voltage of the power grid 2 to be unable to be transmitted downward. However, since the bypass branch 4 is connected to the power supply link in the two sub-power supply systems 1 connected to the same electrical equipment 3, the voltage obtained by the second sub-power supply system 1B from the power grid 2 can be transmitted to the normal power supply link via the bypass branch 4 to supply power to the electrical equipment 3, so that the power supply reliability and stability of the power supply system are guaranteed.

[0036] In some embodiments, for example, Figure 2 As shown. The sub-power supply system includes: a power electronic transformer 11, at least one DC distribution circuit 12 and a plurality of low-voltage conversion circuits 13. The input end of the power electronic transformer 11 is connected to the input end of the sub-power supply system, that is, connected to the power grid 2. The power electronic transformer 11 is configured to convert the AC voltage provided by the power grid 2 into a first DC voltage, for example, converting an AC voltage of 10 kV into a DC voltage of 750 V.

[0037] It should be understood that the electronic power transformer converts the AC voltage provided by the power grid 2 into a first DC voltage that can fluctuate within a certain range. The power electronic transformer in the present application converts the 10kV AC voltage into a 750V DC voltage, and its fluctuation range is between 600 and 900V.

[0038] At least one DC distribution circuit 12 is connected to the output end of the power electronic transformer 11. Figure 2 A sub-power supply system shown in the figure includes two DC distribution circuits 12. The DC distribution circuit 12 includes multiple parallel power supply branches 121, and the first ends of the multiple power supply branches 121 are all connected to the input end of the DC distribution circuit 12, that is, connected to the output end of the power electronic transformer 11. The second ends of different power supply branches 121 are connected to multiple output ends of the DC distribution circuit 12 in a one-to-one correspondence, that is, connected to the low-voltage conversion circuit 13.

[0039] As a possible implementation, Figure 2 As shown, the output end of the power electronic transformer 11 is connected to the busbar, and the input end of at least one DC distribution circuit 12 is connected to the busbar. The busbar is an important device for transmitting and distributing electric energy in the power system. The power electronic transformer 11 is connected to the DC distribution circuit 12 through the busbar, and the load can be flexibly increased or decreased as needed, and the configuration of the power supply system can be conveniently adjusted.

[0040] The DC distribution circuit 12 is configured to distribute the first DC voltage to each power supply branch 121. The input ends of the multiple low-voltage conversion circuits 13 are connected to the multiple power supply branches 121 in a one-to-one correspondence, and the output ends of the multiple low-voltage conversion circuits 13 are connected to the multiple power consumption devices 3 in a one-to-one correspondence. The low-voltage conversion circuit 13 is configured to convert the first DC voltage into a second DC voltage required by the power consumption device 3, for example, converting a 750V DC voltage into a 48V or 240V DC voltage. The power supply link includes a power supply branch 121 and a low-voltage conversion circuit 13 connected to the power supply branch 121.

[0041] It should be noted that for the sake of convenience, Figure 2 Only the case where the DC distribution circuit 12 includes three power supply branches 121 is shown. The connection mode of each power supply branch 121 is the same, that is, one end of the power supply branch 121 is connected to the output end of the power electronic transformer 11, and the other end of the power supply branch 121 is connected to the low-voltage conversion circuit 13. The number of DC distribution circuits 12 and the number of power supply branches 121 in each DC distribution circuit 12 can be adjusted according to the number of electrical equipment, for example Figure 2 The number of DC distribution circuits 12 shown in the figure and the number of power supply branches 121 inside each DC distribution circuit 12 can support 6 power-consuming devices, which is not limited in the present application.

[0042] In other embodiments, for example, Figure 3 As shown, a DC-DC transformer 31 is integrated inside the electrical equipment. For example, a DC-DC transformer is integrated in the head cabinet of an IT cabinet. In this case, the sub-power supply system includes: a power electronic transformer 11 and at least one DC distribution circuit 12. The input end of the power electronic transformer 11 is connected to the input end of the sub-power supply system, and the power electronic transformer 11 is configured to convert the AC voltage provided by the power grid 2 into a first DC voltage. Since the DC-DC transformer 31 can realize the function of DC voltage adjustment, the low-voltage conversion circuit is omitted compared with the above-mentioned embodiment.

[0043] At least one DC distribution circuit 12 is connected to the output end of the power electronic transformer 11. The DC distribution circuit 12 includes a plurality of parallel power supply branches 121. The first ends of the plurality of power supply branches 121 are all connected to the input end of the DC distribution circuit 12. The second ends of different power supply branches 121 are connected one-to-one with the plurality of output ends of the DC distribution circuit 12. The DC distribution circuit 12 is configured to distribute a first DC voltage to each power supply branch 121. One output end of the DC distribution circuit is connected to an electrical device 3 through a first circuit breaker 6.

[0044] The sub-power supply systems in the above embodiments all use a power electronic transformer 11. Compared with a traditional power frequency transformer, the power electronic transformer 11 is smaller in size, lighter in weight, and easier to install and move. The power electronic transformer 11 has the ability to adjust the power factor, which can reduce the harmonic pollution of the power grid 2 and improve the quality of the power grid 2. It can also be connected to the DC link and has the ability to access distributed energy. Since the power conversion link is reduced, the efficiency of the power supply link is improved while the number of voltage converters is reduced, which significantly reduces the footprint of the power supply system. In addition, the power electronic transformer 11 is adapted to high power density working conditions, and the entire power supply system is more stable and reliable.

[0045] As a possible implementation, for example, Figure 2 and Figure 3 The DC distribution circuit 12 includes a plurality of second circuit breakers 122 , which are arranged on a plurality of power supply branches 121 , and the plurality of second circuit breakers 122 correspond to the plurality of power supply branches 121 one by one. Figure 2 and Figure 3 The DC distribution circuit 12 includes three power supply branches 121, and multiple second circuit breakers 122 are arranged on the multiple power supply branches 121, and the multiple second circuit breakers 122 correspond one-to-one to the multiple power supply branches 121, which means that one DC distribution circuit 12 includes three second circuit breakers 122.

[0046] One end of the second circuit breaker 122 is connected to the first end of the power supply branch 121, that is, one end of the second circuit breaker 122 is connected to the output end of the electronic power transformer 11, and the other end of the second circuit breaker 122 is connected to the second end of the power supply branch, that is, one end of the second circuit breaker 122 is connected to the low-voltage conversion circuit 13 or the first circuit breaker 6. When power is supplied to the power-consuming device 3, the second circuit breaker 122 is closed, and when power is stopped to the power-consuming device 3, the second circuit breaker 122 is opened, the power supply link cannot form a closed loop, and the power supply is stopped.

[0047] As a possible implementation, for example, Figure 4 The low voltage conversion circuit 13 includes a third circuit breaker 131 and a DC-DC transformer 31. One end of the third circuit breaker 131 is connected to the input end of the low voltage conversion circuit 13, the other end of the third circuit breaker 131 is connected to the input end of the DC-DC transformer 31, and the output end of the DC-DC transformer 31 is connected to the output end of the low voltage conversion circuit 13.

[0048] When the third circuit breaker 131 is turned on, a closed loop cannot be formed between the power supply link and the power consumption device 3, and the power supply in the power grid 2 cannot be transmitted to the power consumption device 3. When some components of the power supply link, such as the DC distribution circuit 12, fail, disconnecting the corresponding third circuit breaker 131 can protect the subsequent circuits. The DC-DC transformer 31 is a core device that converts the first DC voltage into the second DC voltage required by the power consumption device 3.

[0049] As a possible implementation, Figure 4 As shown. The low-voltage conversion circuit 13 also includes a first fuse 132, which is arranged between the output end of the DC-DC transformer 31 and the output end of the low-voltage conversion circuit. The fuse is used to prevent the circuit and electrical equipment from being damaged due to overcurrent or short circuit. When the current in the circuit exceeds the rated value of the fuse, the fuse will melt due to heat, thereby cutting off the circuit and playing a protective role. Therefore, when the current flowing through the first fuse 132 is too large, the first fuse 132 will melt, and the power supply link will be short-circuited, thereby protecting the safety of the electrical equipment 3 connected to the first fuse 132.

[0050] As a possible implementation, Figure 4 As shown. The two identical sub-power supply systems include a first power supply sub-system 1A and a second power supply sub-system 1B. The bypass branch includes a fourth circuit breaker 41, one end of the fourth circuit breaker 41 is connected to the DC distribution circuit 12 of the first power supply sub-system 1A, and the other end of the fourth circuit breaker 41 is connected to the DC distribution circuit 12 of the second power supply sub-system 1B.

[0051] The design of the bypass branch greatly improves the fault tolerance of the circuit system. For example, when the power electronic transformer 11 of the first power supply subsystem 1A fails and cannot output voltage, the fourth circuit breaker 41 is closed, and the voltage output by the power electronic transformer 11 in the second power supply subsystem 1B can be transmitted to the power supply link of the first power supply subsystem 1A through the bypass branch. In this case, even if any power supply link in the first power supply subsystem 1A and the second power supply subsystem 1B has a problem, it can still ensure that one power supply is output to the power-consuming device, so the reliability of the power supply system is high.

[0052] In some embodiments, for example, Figure 5 As shown, the DC distribution circuit 12 further includes a standby branch 123, a first end of the standby branch 123 is connected to the input end of the DC distribution circuit 12, that is, connected to the output end of the power electronic transformer 11, and a second end of the standby branch 123 is connected to at least one storage battery 124. The output end of the power electronic transformer 11 is connected to the input end of the DC distribution circuit 12 via a fifth circuit breaker 14.

[0053] Since the first end of the backup branch 123 is connected to the input end of the DC distribution circuit 12, and the first end of the power supply branch 121 is also connected to the input end of the DC distribution circuit 12, the backup branch 123 and multiple power supply branches 121 are in a parallel relationship. When the power grid 2 cannot supply power, the battery 124 in the backup branch 123 supplies power to the electrical equipment 3.

[0054] As a possible implementation, Figure 5 As shown, in order to further ensure the safety and reliability of the backup branch 123, a second fuse 125 is further connected between the second end of the backup branch 123 and the battery 124. When a large current flows through the backup branch 123, the second fuse 125 is blown, and the large current cannot be transmitted to the battery 124, thereby protecting the battery 124.

[0055] In some embodiments, for example, Figure 6 The sub-power supply system further includes an electronic switch 15 . The input end of the electronic switch 15 is connected to the output end of the power electronic transformer 11 , and the output end of the electronic switch 15 is connected to the DC distribution circuit through the fifth circuit breaker 14 .

[0056] The power electronic transformer 11 includes a first output terminal and a second output terminal. The fifth circuit breaker 14 includes a first input terminal and a second input terminal. The electronic switch 15 includes a first switch tube 151, a second switch tube 152, a first diode 153, a second diode 154 and a capacitor 155. The first pole of the first switch tube 151 is connected to the first input terminal of the electronic switch 15, the second pole of the first switch tube 151 is connected to the first output terminal of the electronic switch 15, the first pole of the second switch tube 152 is connected to the first output terminal of the electronic switch 15, and the second pole of the second switch tube 152 is connected to the second output terminal of the electronic switch 15. The positive pole of the first diode 153 is connected to the second pole of the first switch tube 151, and the negative pole of the first diode 153 is connected to the first pole of the first switch tube 151. The positive pole of the second diode 154 is connected to the second pole of the second switch tube 152, and the negative pole of the second diode 154 is connected to the first pole of the second switch tube 152. The first input end of the electronic switch 15 is connected to the first output end of the power electronic transformer 11, the second input end of the electronic switch 15 is connected to the second output end of the power electronic transformer 11, the first output end of the electronic switch 15 is connected to the first input end of the fifth circuit breaker 14, and the second output end of the electronic switch 15 is connected to the second input end of the fifth circuit breaker 14. One end of the capacitor 155 is connected to the second electrode of the first switch tube 151, and the other end of the capacitor 155 is connected to the first output end of the electronic switch 15.

[0057] In some embodiments, Figure 6As shown, the elements in the power supply system include two-terminal inputs and two-terminal outputs, for example, the first output terminal of the power electronic transformer 11 is connected to the positive bus 51 , and the second output terminal of the power electronic transformer 11 is connected to the negative bus 52 .

[0058] As a possible implementation, the positive busbar 51 and the negative busbar 52 are suspended.

[0059] As a possible implementation, a plurality of DC-DC transformers 31 are configured in a low-voltage conversion circuit, and the plurality of DC-DC transformers 31 are connected in parallel. The number of DC-DC transformers 31 depends on the power required by the electrical device 3 and the power that can be converted by one DC-DC transformer 31. In order to improve the reliability of the power supply system, the number of DC-DC transformers 31 connected in parallel can be increased on the basis of meeting the power required by the electrical device 3. For example, the electrical device 3 requires 2000w of power, and one DC-DC transformer 31 can provide 500w of power. Four DC-DC transformers 31 can meet the power required by the electrical device 3. However, in order to improve the reliability of the power supply system, one more DC-DC transformer 31 is set on the basis of the four DC-DC transformers 31.

[0060] The electronic switch 15 can step down the output of the power electronic transformer 11. When the output of the power electronic transformer 11 meets the voltage required by the subsequent power supply link, the electronic switch 15 maintains the output voltage of the power electronic transformer 11 unchanged. At this time, the first switch tube 151 is turned on and the second switch tube 152 is turned off. When the output voltage of the power electronic transformer 11 needs to be adjusted and reduced, the first switch tube 151 is turned off and the second switch tube 152 is turned on. When a short circuit fault occurs in the circuit between the power electronic transformer 11 and the electronic switch 15, the first switch tube 151 and the second switch tube 152 of the electronic switch 15 are both turned off to isolate the short circuit between the power electronic transformer 11 and the fault point. The output of the power electronic transformer 11 is controlled by the electronic switch 15, so that the power electronic transformer 11 does not need to have a voltage regulation function. For example, when there is no electronic switch 15 in the power supply system, the power electronic transformer 11 needs to have the ability to adjust the voltage from 600V to 900V. When there is an electronic switch 15 in the power supply system, the power electronic transformer 11 only needs to stably output a voltage of 900V. When the voltage needs to be reduced, the electronic switch 15 intervenes to achieve voltage regulation, thereby reducing the cost of the entire power supply system.

[0061] The working process of the entire power supply system is as follows:

[0062] The power electronic transformer 11 obtains AC voltage from the power grid and converts it into a first DC voltage, which is transmitted to the fifth circuit breaker 14 after passing through the electronic switch 15. The fifth circuit breaker 14 transmits the first DC voltage to multiple DC distribution circuits in a closed state. The second circuit breaker 122 in the power supply branch of the DC distribution circuit is closed, and the first DC voltage is transmitted to the DC-DC transformer 31 and converted into a second DC voltage. At this time, the first circuit breaker is also in a closed state, and the second DC voltage supplies power to the power-consuming device 3. The transmission of voltages on different power supply branches is the same. When the power grid is powered normally, the fifth circuit breaker is disconnected and the standby branch does not work. When the power supply link of the sub-power supply system is normal, the fourth circuit breaker is also in a disconnected state, and the bypass branch is not conductive. On the contrary, when the power supply of the power grid is abnormal, the fifth circuit breaker is closed, and the battery 124 in the standby branch supplies power. When the power supply link of the sub-power supply system is abnormal, the fourth circuit breaker is closed. In the description of this specification, specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0063] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A power supply system, characterized in that: Includes two identical sub-power supply systems; The input end of the sub-power supply system is connected to the power grid, the sub-power supply system includes multiple power supply links, the output ends of the multiple power supply links are connected to multiple power-consuming devices in a one-to-one correspondence, and the sub-power supply system is configured to: convert the voltage provided by the power grid into a voltage adapted to the power-consuming device through the power supply link and transmit it to the power-consuming device; The power supply links in the two sub-power supply systems connected to the same electrical equipment are connected via a bypass branch.

2. The power supply system according to claim 1, characterized in that: The sub-power supply system comprises: A power electronic transformer, wherein an input terminal of the power electronic transformer is connected to an input terminal of the sub-power supply system, and the power electronic transformer is configured to convert an AC voltage provided by a power grid into a first DC voltage; at least one DC distribution circuit connected to the output end of the power electronic transformer, the DC distribution circuit comprising a plurality of parallel power supply branches, the first ends of the plurality of power supply branches are all connected to the input end of the DC distribution circuit, and the second ends of different power supply branches are connected to the plurality of output ends of the DC distribution circuit in a one-to-one correspondence; the DC distribution circuit is configured to distribute the first DC voltage to each of the power supply branches; A plurality of low-voltage conversion circuits, wherein input ends of the plurality of low-voltage conversion circuits are connected one-to-one with the plurality of power supply branches, and output ends of the plurality of low-voltage conversion circuits are connected one-to-one with the plurality of electrical devices; the low-voltage conversion circuits are configured to convert the first DC voltage into a second DC voltage required by the electrical devices; The power supply link includes the power supply branch and a low voltage conversion circuit connected to the power supply branch.

3. The power supply system according to claim 1, characterized in that: In the case where the power-consuming device is integrated with a DC-DC transformer, the sub-power supply system includes: A power electronic transformer, wherein an input terminal of the power electronic transformer is connected to an input terminal of the sub-power supply system, and the power electronic transformer is configured to convert an AC voltage provided by a power grid into a first DC voltage; at least one DC distribution circuit connected to the output end of the power electronic transformer, the DC distribution circuit comprising a plurality of parallel power supply branches, the first ends of the plurality of power supply branches are all connected to the input end of the DC distribution circuit, and the second ends of different power supply branches are connected to the plurality of output ends of the DC distribution circuit in a one-to-one correspondence; the DC distribution circuit is configured to distribute the first DC voltage to each of the power supply branches; An output end of the DC distribution circuit is connected to an electrical device via a first circuit breaker.

4. The power supply system according to claim 2 or 3, characterized in that: The DC distribution circuit includes multiple second circuit breakers, which are arranged on multiple power supply branches and correspond one-to-one to the multiple power supply branches. One end of the second circuit breaker is connected to the first end of the power supply branch, and the other end of the second circuit breaker is connected to the second end of the power supply branch.

5. The power supply system according to claim 2, characterized in that: The low-voltage conversion circuit includes a third circuit breaker and a DC-DC transformer; one end of the third circuit breaker is connected to the input end of the low-voltage conversion circuit, the other end of the third circuit breaker is connected to the input end of the DC-DC transformer, and the output end of the DC-DC transformer is connected to the output end of the low-voltage conversion circuit.

6. The power supply system according to claim 5, characterized in that: The low voltage conversion circuit further includes a first fuse, which is arranged between the output end of the DC-DC transformer and the output end of the low voltage conversion circuit.

7. The power supply system according to any one of claims 2 to 6, characterized in that: The two identical sub-power supply systems include a first power supply sub-system and a second power supply sub-system; The bypass branch includes a fourth circuit breaker, one end of the fourth circuit breaker is connected to the DC distribution circuit of the first power supply subsystem, and the other end of the fourth circuit breaker is connected to the DC distribution circuit of the second power supply subsystem.

8. The power supply system according to claim 2 or 3, characterized in that: The DC distribution circuit further comprises a backup branch, a first end of the backup branch is connected to an input end of the DC distribution circuit, and a second end of the backup branch is connected to the at least one storage battery; The output end of the power electronic transformer is connected to the input end of the DC distribution circuit via a fifth circuit breaker.

9. The power supply system according to claim 8, characterized in that: A second fuse is also connected between the second end of the backup branch and the battery.

10. The power supply system according to claim 8, characterized in that: The sub-power supply system also includes an electronic switch; The input end of the electronic switch is connected to the output end of the power electronic transformer, and the output end of the electronic switch is connected to the DC distribution circuit through the fifth circuit breaker; The power electronic transformer comprises a first output terminal and a second output terminal; the fifth circuit breaker comprises a first input terminal and a second input terminal; The electronic switch comprises a first switch tube, a second switch tube, a first diode, a second diode and a capacitor, wherein a first electrode of the first switch tube is connected to a first input end of the electronic switch, a second electrode of the first switch tube is connected to a first output end of the electronic switch, a first electrode of the second switch tube is connected to a first output end of the electronic switch, and a second electrode of the second switch tube is connected to a second output end of the electronic switch; The anode of the first diode is connected to the second electrode of the first switch tube, and the cathode of the first diode is connected to the first electrode of the first switch tube; the anode of the second diode is connected to the second electrode of the second switch tube, and the cathode of the second diode is connected to the first electrode of the second switch tube; The first input end of the electronic switch is connected to the first output end of the power electronic transformer, the second input end of the electronic switch is connected to the second output end of the power electronic transformer, the first output end of the electronic switch is connected to the first input end of the fifth circuit breaker, and the second output end of the electronic switch is connected to the second input end of the fifth circuit breaker; one end of the capacitor is connected to the second pole of the first switch tube, and the other end of the capacitor is connected to the first output end of the electronic switch.

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