Medium-voltage uninterruptible power system and data center machine room

Abstract

The utility model discloses a medium-voltage uninterruptible power system and a data center machine room, the medium-voltage uninterruptible power system comprises a plurality of energy storage inversion modules and a static bypass switch module, each energy storage inversion module comprises an energy storage battery cluster and a high-voltage cascade inverter, and the energy storage battery cluster of each energy storage inversion module is connected to the high-voltage cascade inverter. A first port of the high-voltage cascade inverter of each energy storage inversion module is connected with an output end of the static bypass switch module, an input end of the static bypass switch module is connected with a mains supply, and an output end of the static bypass switch module is a power supply end and is used for supplying power to load equipment in the data center machine room. By adopting the scheme, energy is stored through the medium-voltage uninterrupted power system, so that the energy efficiency of the system is improved to the maximum extent while uninterrupted switching of the power system and the mains supply is realized. Moreover, the power system reduces the power change link of the power supply link of the data center, and improves the overall efficiency of the power system.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of power supply, in particular to a medium-voltage uninterrupted power system and a data center room. BACKGROUND

[0002] At present, new power systems are emerging one after another, and energy storage is a basic function of a power system.

[0003] The current energy storage scheme mainly includes distributed energy storage and centralized energy storage. The distributed energy storage includes two schemes. One is to adopt a one-to-one mode of a battery cluster and a power conversion system (PCS), to connect multiple battery clusters and PCS in parallel and then connect to a low-voltage system or a high-voltage system through a step-up transformer, and to allow short-time power failure. The other is to store energy on the standby side of an uninterruptible power supply (UPS), so as to realize uninterrupted switching between energy storage and commercial power. The switching between centralized energy storage and commercial power is discontinuous.

[0004] In the information age, with the rapid development of technologies such as artificial intelligence, cloud computing and the Internet of Things, many large data centers have emerged, and power systems with energy storage function have become an essential basic setting for data centers. However, in the traditional energy storage scheme, the one-to-one distributed energy storage and the centralized energy storage cannot meet the demand for uninterrupted switching, and the distributed energy storage scheme on the standby side of the UPS has high risk and poor safety due to frequent charging and discharging of the UPS backup battery. Therefore, there is an urgent need in the industry to propose a power system with energy storage function suitable for data centers. CONTENT OF THE INVENTION

[0005] The embodiment of the present application provides a medium-voltage uninterrupted power system and a data center room, which realizes uninterrupted switching between a power system and a commercial power source through energy storage of the medium-voltage uninterrupted power system, and maximizes system energy efficiency.

[0006] In a first aspect, the embodiment of the present application provides a medium-voltage uninterrupted power system, which comprises a plurality of energy storage inverter modules 1 and a static bypass switch module 2, each of the energy storage inverter modules 1 comprises an energy storage battery cluster 11 and a high-voltage cascaded inverter 12, and wherein:

[0007] The energy storage battery cluster 11 of each of the energy storage inverter modules 1 is connected to the high-voltage cascaded inverter 12;

[0008] The first port of the high-voltage cascaded inverter 12 of each of the energy storage inverter modules 1 is connected to the output end of the static bypass switch module 2;

[0009] The input end of the static bypass switch module 2 is connected with the commercial power supply, the output end of the static bypass switch module 2 is a power supply end, and the power supply end is used for supplying power for the load equipment in the data center room;

[0010] When the static bypass switch module 2 is in communication with the commercial power supply, the commercial power supply supplies power for the load equipment through the output end of the static bypass switch module 2 and charges the energy storage battery cluster 11 of each energy storage inverter module 1 through the first port;

[0011] When the static bypass switch module 2 is disconnected with the commercial power supply, the energy storage battery cluster 11 of each energy storage inverter module 1 supplies power for the load equipment through the first port.

[0012] In a second aspect, the embodiments of the present application provide a data center room, comprising: a room, and the room is internally provided with the medium-voltage uninterrupted power system as described in the first aspect or various possible implementation manners of the first aspect.

[0013] The medium-voltage uninterrupted power system and the data center room provided by the embodiments of the present application, the medium-voltage uninterrupted power system comprises a plurality of energy storage inverter modules and a static bypass switch module, each energy storage inverter module comprises an energy storage battery cluster and a high-voltage cascaded inverter, and the energy storage battery cluster of each energy storage inverter module is connected to the high-voltage cascaded inverter. The first port of the high-voltage cascaded inverter of each energy storage inverter module is connected with the output end of the static bypass switch module, the input end of the static bypass switch module is connected with the commercial power supply, the output end of the static bypass switch module is a power supply end, and the power supply end is used for supplying power for the load equipment in the data center room. When the static bypass switch module is in communication with the commercial power supply, the commercial power supply supplies power for the load equipment through the output end of the static bypass switch module and charges the energy storage battery cluster of each energy storage inverter module through the first port; when the static bypass switch module is disconnected with the commercial power supply, the energy storage battery cluster of each energy storage inverter module supplies power for the load equipment through the first port. By using the scheme, the uninterrupted switching of the power system and the commercial power supply is realized through the energy storage of the medium-voltage uninterrupted power system, and the system energy efficiency is maximized. Moreover, the power supply link power change link of the data center is reduced, and the overall efficiency of the power system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0015] Figure 1is a structural schematic diagram of a medium-voltage uninterrupted power system provided by an embodiment of the present application;

[0016] Figure 2 is another structural schematic diagram of a medium-voltage uninterrupted power system provided by an embodiment of the present application;

[0017] Figure 3 is a flow chart of a power supply method provided by an embodiment of the present application;

[0018] Figure 4 is a schematic diagram of an energy storage inverter module of a medium-voltage uninterrupted power system provided by an embodiment of the present application;

[0019] Figure 5 is another structural schematic diagram of a medium-voltage uninterrupted power system provided by an embodiment of the present application;

[0020] Figure 6 is yet another structural schematic diagram of a medium-voltage uninterrupted power system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0021] For the purposes of this application, the terms such as "upper", "upper side", "lower", "lower side", "first end", "second end", "one end", "the other end" and the like indicating spatial relative positions are used to describe the relationship of one unit or feature relative to another unit or feature as shown in the drawings for the purpose of convenience. The spatial relative position terms can be intended to include different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, if the device in the drawing is turned over, the unit described as being "below" or "under" the other unit or feature will be "above" the other unit or feature. Therefore, the exemplary term "below" can encompass both the above and below positions. The device can be oriented in other ways (rotated 90 degrees or other orientations), and the spatial-related descriptions used herein are interpreted accordingly.

[0022] In addition, the terms "mount", "set", "provided with", "connect", "sliding connection", "fix", "sleeve" should be broadly understood. For example, "connection" can be fixed connection, detachable connection, or integral structure; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] In the information age, with the rapid development of technologies such as artificial intelligence, cloud computing and the Internet of Things, many large data centers have emerged. Data centers cannot be suddenly powered off, and sudden power failure will cause serious losses to data centers. Therefore, the industry has high requirements for the power system that supplies power to data centers. In order to ensure that data centers do not suddenly lose power, the power system needs to have energy storage function. When the city power is cut off, the power system uses the stored energy to provide uninterrupted power supply for the data center.

[0024] However, the current energy storage scheme mainly includes distributed energy storage and centralized energy storage. Distributed energy storage includes scheme 1 and scheme 2. In scheme 1, the battery cluster is one-to-one with the PCS, and multiple groups are connected in parallel to access the low-voltage system or access the high-voltage system through a step-up transformer. Scheme 1 has small capacity and dispersed energy storage, and is only suitable for small energy storage systems, and the load allows short power failure, which is not suitable for data centers. Scheme 2 stores energy on the UPS standby power side, increases the UPS standby battery time from minutes to hours, and uses the UPS to realize the charging and discharging of the battery. Although this scheme can realize uninterrupted switching between energy storage and city power, the energy storage is dispersed and cannot be uniformly controlled, and the UPS backup battery is frequently charged and discharged, which has certain risk and low customer acceptance.

[0025] In the centralized energy storage scheme, multiple battery clusters are connected in parallel to directly access the PCS, and are directly connected to the high-voltage system through a step-up transformer. The battery has poor balance, and the energy storage and city power switching is intermittent.

[0026] Obviously, whether it is distributed energy storage or centralized energy storage, there are certain limitations in the application of data centers. Moreover, at the present stage, the power supply and distribution link of the data center power system is long, and there are many power conversion links, which leads to low efficiency. In addition, the existing energy storage scheme has the following disadvantages: first, the existing distributed energy storage scheme 1 and centralized energy storage cannot realize uninterrupted switching between city power and power system, and cannot be effectively integrated with data centers; second, the energy storage system has low efficiency; third, the storage batteries are connected in parallel or multiple machines are connected in parallel, and the storage batteries have poor balance.

[0027] Based on this, the embodiment of the present application provides a medium-voltage uninterrupted power system and a data center room. Through the energy storage of the medium-voltage uninterrupted power system, the uninterrupted switching between the power system and the city power supply is realized, and the system energy efficiency is maximized.

[0028] Figure 1 is a structural schematic diagram of the medium-voltage uninterrupted power system provided by the embodiment of the present application. Please refer to Figure 1The medium-voltage uninterrupted power system provided by the embodiments of the present application comprises a plurality of energy storage inverter modules 1 and a static bypass switch module 2. Each energy storage inverter module 1 comprises an energy storage battery cluster 11 and a high-voltage cascaded inverter 12. The energy storage battery 11 of each energy storage inverter module 1 is connected to the high-voltage cascaded inverter 12. The first port of the high-voltage cascaded inverter 12 of each energy storage inverter module 1 is connected to the output end of the static bypass switch module 2. The input end of the static bypass switch module 2 is connected to the commercial power supply, and the output end of the static bypass switch module 2 is a power supply end for supplying power to the load equipment in the data center room.

[0029] Please refer to Figure 1 The energy storage battery cluster 11 monitors the battery through the control module, and the energy storage battery cluster 11 is connected to the high-voltage cascaded inverter 12 to realize conversion between AC and DC.

[0030] Please refer to Figure 1 When the static bypass switch module 2 is connected to the commercial power supply, that is, the switch 4 between the commercial power supply and the static bypass switch module 2 is closed, and the switch 5 between the static bypass switch module 2 and the load equipment is closed, that is, when the commercial power supply is normal, the commercial power supply supplies power to the load equipment through the output end of the static bypass switch module 2. At the same time, when the switch between the first port of the high-voltage cascaded inverter 12 and the static bypass switch module 2 is closed, the commercial power supply charges the energy storage battery cluster 11 of each energy storage inverter module 1 through the first port of the high-voltage cascaded inverter 12. The current flow direction is shown by the solid line arrow in the figure.

[0031] When the static bypass switch module 2 is disconnected from the commercial power supply, that is, when the switch 4 between the commercial power supply and the static bypass switch module 2 is disconnected, and / or the switch 5 between the static bypass switch module 2 and the load equipment is disconnected, that is, when the commercial power supply fails, the energy storage battery cluster 11 of each energy storage inverter module 1 supplies power to the load equipment through the first port. The current flow direction is shown by the dashed line arrow in the figure.

[0032] The medium-voltage uninterruptible power system provided in this application includes multiple energy storage inverter modules and a static bypass switch module. Each energy storage inverter module includes an energy storage battery cluster and a high-voltage cascaded inverter. The energy storage battery cluster of each energy storage inverter module is connected to the high-voltage cascaded inverter. The first port of the high-voltage cascaded inverter of each energy storage inverter module is connected to the output terminal of the static bypass switch module. The input terminal of the static bypass switch module is connected to the mains power supply, and the output terminal of the static bypass switch module is the power supply terminal, used to supply power to the load equipment in the data center server room. When the static bypass switch module is connected to the mains power supply, the mains power supply supplies power to the load equipment through the output terminal of the static bypass switch module and charges the energy storage battery clusters of each energy storage inverter module through the first port. When the static bypass switch module is disconnected from the mains power supply, the energy storage battery clusters of each energy storage inverter module supply power to the load equipment through the first port. By adopting this scheme, energy storage in the medium-voltage uninterruptible power system achieves uninterrupted switching between the power system and the mains power supply while maximizing system energy efficiency. Moreover, this power system reduces power variation links in the data center power supply chain, improving the overall efficiency of the power system.

[0033] Figure 2 This is another structural schematic diagram of the medium-voltage uninterruptible power system provided in the embodiments of this application. Please refer to... Figure 2 Optionally, the medium-voltage uninterruptible power system provided in this embodiment may also include: a maintenance bypass switch 3. Figure 2 The medium-voltage uninterruptible power system shown above Figure 1 Based on this, a maintenance bypass switch 3 is added in parallel with the static bypass switch module 2. The maintenance bypass switch 3 includes at least a medium-voltage circuit breaker.

[0034] Please refer to Figure 2 The maintenance bypass switch 3 is connected in parallel with the static bypass switch module 2. Maintenance bypass switch 3 mainly includes a medium-voltage circuit breaker. When the mains power supply is normal, if a fault occurs in equipment within the medium-voltage uninterruptible power system requiring maintenance, maintenance bypass switch 3 is closed. At this time, at least one of switches 4, 5, 21, or 23 is disconnected, and the mains power supply provides power to the load equipment in the data center computer room through maintenance bypass switch 3. The current flow direction is shown by the dashed arrow in the figure.

[0035] This approach involves setting up a maintenance bypass switch in parallel with the static bypass switch module. When maintenance is required on equipment within the medium-voltage uninterruptible power system, the static bypass switch module is disconnected, and power is supplied to the end-load equipment through the branch where the maintenance bypass switch is located. This facilitates maintenance of the medium-voltage uninterruptible power system, and the circuit is simple and low-cost.

[0036] Optional, please refer to Figure 2The static bypass switch module 2 comprises a first switch 21, a bypass switch 22, a second switch 23 and a third switch 24, and the first switch 21, the bypass switch 22 and the second switch 23 are connected in series and then connected in parallel with the third switch 24.

[0037] Please refer to Figure 2 The first switch 21, the bypass switch 22 and the second switch 23 are connected in series and then connected in parallel with the third switch 24. Based on the design, the current flow direction of the mains power supply can be flexibly controlled. For example, when the mains power supply is normal and the electricity price is higher than the preset value, if the switch 4 and the switch 5 are both closed, the third switch 24 is disconnected, and at least one of the first switch 21 or the second switch 23 is disconnected, so that the mains power supply and the static bypass switch module 2 are disconnected. Then, the energy storage battery cluster 11 of each energy storage inverter module 1 supplies power to the load device through the first port of the high-voltage cascade inverter. The current flow direction is shown by the dashed arrow in the figure.

[0038] For another example, when the mains power supply is normal and the electricity price is lower than the preset value, if the switch 4 and the switch 5 are both closed, the third switch 24 is disconnected, and the first switch 21 and the second switch 23 are closed, so that the mains power supply and the static bypass switch module 2 are connected. Then, the load device is supplied with power through the mains power supply; at the same time, the energy storage battery cluster 11 of the energy storage inverter module 1 is charged through the mains power supply. The current flow direction is shown by the solid arrow in the figure.

[0039] For another example, when the mains power supply is normal and the electricity price is lower than the preset value, and it is not desired to charge the energy storage battery cluster 11, if the switch 4 and the switch 5 are both closed, at least one of the first switch 21 or the second switch 23 is disconnected, and the third switch 24 is closed, so that the load device is supplied with power through the mains power supply, but the energy storage battery cluster 11 of the energy storage inverter module 1 is not charged.

[0040] For another example, when the medium-voltage uninterruptible power system needs to be repaired, if the switch 4 and the switch 5 are both closed, at least one of the first switch 21 or the second switch 23 is disconnected, and the third switch 24 is disconnected, and the maintenance bypass switch 3 is closed, so that the load device is supplied with power through the mains power supply and the maintenance bypass switch 3, and the energy storage inverter module 2 is in a power-off state, which is convenient for repairing the medium-voltage uninterruptible power system. The current flow direction is shown by the dotted line arrow in the figure.

[0041] Figure 2 In the embodiment, the switch 4 and the switch 5 are auxiliary switches, and the switch 4 can control the connection and disconnection of the static bypass switch module 2 and the mains power supply. When the switch 4 is disconnected, the static bypass switch module 2 and the mains power supply are disconnected; when the switch 4 is closed, the static bypass switch module 2 and the mains power supply are connected.

[0042] The static bypass switch module 2 is connected with the load device through the switch 5. When the switch 5 is off, the static bypass switch module 2 is disconnected with the load device; when the switch 5 is on, the static bypass switch module 2 is connected with the load device.

[0043] Please refer to Figure 2 If the switch 4 and the switch 5 are not set, the static bypass switch module 2 can control the connection and disconnection of the static bypass switch module 2 with the power supply and the load device through the first switch, the bypass switch 22, the second switch 23 and the third switch 24 of the static bypass switch module 2 itself. The switch 4 and the switch 5 are set in order to control the connection and disconnection of the static bypass switch module 2 with the power supply and the load device without controlling the switches of the static bypass switch module 2 itself. In the actual circuit, the switch 4 and the switch 5 can be set or not set according to the needs.

[0044] In this scheme, the static bypass switch includes a first switch, a bypass switch, a second switch and a third switch. Based on this structure, the power supply for the load device through the power supply or the energy storage inversion module can be flexibly controlled, and the circuit is simple.

[0045] Optionally, in the above embodiment, the bypass switch 22 includes at least a bidirectional semiconductor.

[0046] For example, the bypass switch 22 in the static bypass switch module 2 adopts a bidirectional semiconductor, such as a silicon controlled rectifier (SCR) and the like. The static bypass switch module 2 is connected with the load device of the data center through the medium-voltage switch component. When the energy storage inversion module of the medium-voltage uninterrupted power system needs to be repaired due to failure, the load device is powered through the maintenance bypass switch.

[0047] In this scheme, the bypass switch adopts a bidirectional semiconductor, which is convenient for realizing uninterrupted switching between the power supply and the energy storage.

[0048] Optionally, in the above embodiment, the output end of the static bypass switch module 2 is connected with the input end of at least one safety transformer, the output end of the safety transformer is connected with the load device, and no short-time backup power module and low-voltage uninterrupted power supply is set between the output end of the safety transformer and the load device.

[0049] Please refer to 1 and Figure 2 , Figure 1 In the above embodiment, the short-time backup power module and the low-voltage uninterrupted power supply are set between the output end of the safety transformer and the load device. Figure 2 In the above embodiment, no short-time backup power module and low-voltage uninterrupted power supply is set between the output end of the safety transformer and the load device.

[0050] Please refer toFigure 2 The medium-voltage uninterrupted power system can realize direct uninterrupted switching between energy storage power supply and commercial power supply, and can cancel the low-voltage side UPS and short-time standby power supply.

[0051] It should be noted that, Figure 1 Only for comparison, the low-voltage side UPS and short-time standby power supply are not canceled. In fact, Figure 1 The low-voltage side UPS and short-time standby power supply in the medium-voltage uninterrupted power system can also be canceled.

[0052] By canceling the low-voltage side UPS and short-time standby power supply, the long-short-time energy storage combined purpose is achieved, the power change is reduced, the link is simplified, and the cost is reduced.

[0053] Optionally, in the above embodiment, the output voltage of the first port of the high-voltage cascaded inverter 12 is the same as the output voltage of the commercial power supply.

[0054] For example, the output voltage of the high-voltage cascaded inverter 12 is the same as the commercial power supply, which can be designed as 6-35kV, and matched according to the commercial power supply.

[0055] By this scheme, the output voltage of the first port of the high-voltage cascaded inverter is the same as the output voltage of the commercial power supply, so that the step-up transformer is canceled on the energy storage side, and the purpose of improving the system efficiency is achieved.

[0056] Optionally, in the above embodiment, the energy storage battery cluster 11 includes lithium batteries or lead-carbon batteries.

[0057] For example, the energy storage battery cluster 11 is composed of long-cycle-life batteries such as lithium batteries or lead-carbon batteries in series, and the battery capacity can be adjusted according to actual needs.

[0058] By this scheme, the energy storage battery cluster is composed of long-cycle-life batteries such as lithium batteries or lead-carbon batteries, which realizes the improvement of the stability of the medium-voltage uninterrupted power system while having high environmental performance.

[0059] In the above embodiment, the medium-voltage uninterrupted power system further includes a control module (not shown in Figure 1 and Figure 2 ). The control module has functions of battery management, power monitoring, energy management, system control, etc. The control module is connected with the energy storage battery cluster 11, the high-voltage cascaded inverter 12, the static bypass switch module 2, the maintenance bypass switch 3, etc. According to the power supply time period, the energy of the energy storage battery cluster 11, whether the energy storage battery cluster 11 and the high-voltage cascaded inverter 12 of each energy storage inverter module 2 are faulty, etc., the control module controls the conduction and closing of the first switch 21, the bypass switch 22, the second switch 23, the third switch 24 and the maintenance bypass switch 3, so as to control the power supply mode of the medium-voltage uninterrupted power system.

[0060] Based on the above medium-voltage uninterrupted power system, the embodiment of the present application further provides a power supply method. For example, refer to Figure 3 . Figure 3 is a flowchart of the power supply method provided by the embodiment of the present application. The embodiment includes:

[0061] 301, determine whether the mains power supply is normal. If the mains power supply is normal, step 302 is performed; if the mains power supply is not normal, step

[0062] The mains is a power supply mode in the modern life power supply system, mainly converted by an alternating current power adapter. The mains is the industrial frequency alternating current (AC), and the three common quantities of alternating current are used to represent: voltage, current, and frequency. When the mains power supply is normal, the control module of the medium-voltage uninterrupted power system performs step 302; if the mains power supply is not normal, step 303 is performed.

[0063] 302, control the static bypass switch module to be turned on, so as to use the mains power supply to supply power to the load device in the data center room.

[0064] 303, control the static bypass switch module to be turned off, so as to use a plurality of energy storage inverter modules to supply power to the load device in the data center room.

[0065] Among them, the energy storage inverter module includes a high-voltage cascaded inverter and an energy storage battery cluster connected to the high-voltage cascaded inverter, the first port of the high-voltage cascaded inverter is connected with the output end of the static bypass switch module, the input end of the static bypass switch module is connected with the mains power supply, and the output end of the static bypass switch module is a power supply end, used for supplying power to the load device in the data center room.

[0066] For specific implementation process, refer to the description of the above medium-voltage uninterrupted power system, which will not be repeated here.

[0067] The power supply method provided by the embodiment of the present application, the medium-voltage uninterrupted power system determines whether the mains power supply is normal. When the mains power supply is normal, the static bypass switch module is controlled to be turned on, so as to use the mains power supply to supply power to the load device in the data center room; when the mains power supply is abnormal, the static bypass switch module is controlled to be turned off, so as to use a plurality of energy storage inverter modules to supply power to the load device in the data center room. By using this scheme, the uninterrupted switching of the power system and the mains power supply is realized through the energy storage of the medium-voltage uninterrupted power system, and the system energy efficiency is maximized.

[0068] Optionally, in the above embodiment, when the commercial power supply is normal, the medium-voltage uninterrupted power supply system further determines whether the power supply time of the commercial power supply belongs to a preset time period. When the power supply time belongs to the preset time period, the control module controls the static bypass switch module to be turned on, so as to charge the energy storage battery cluster of each energy storage inverter module by using the commercial power supply.

[0069] For example, the preset time period is a time period in which the external power consumption is relatively small, such as 11:00 pm to 5:00 am, etc. For another example, the preset time period is a time period in which the electricity price is relatively low. The medium-voltage uninterrupted power supply system charges the energy storage battery cluster of each energy storage inverter module by using the commercial power supply in the preset time period, so as to ensure safety while reducing the charging cost.

[0070] Optionally, in the above embodiment, the control module can control the power supply mode of the medium-voltage uninterrupted power supply system by controlling the opening time of some switches in the medium-voltage uninterrupted power supply system. The power supply mode includes the following modes:

[0071] Mode 1: the commercial power supply is used to supply power to the load device. The current flow direction is as shown by the dashed arrow in FIG. 6. Figure 2

[0072] In this mode, when the commercial power supply is normal and the electricity price is higher than a preset value, or when the power supply time does not belong to the preset time period, the control module controls the switch 4 and the switch 5 to be closed, controls the third switch 24 to be open, and controls at least one of the first switch 21 or the second switch 23 to be open, so as to disconnect the commercial power supply from the static bypass switch module 2. Then, the energy storage battery cluster 11 of each energy storage inverter module 1 supplies power to the load device through the first port of the high-voltage cascaded inverter.

[0073] Mode 2: the commercial power supply is used to supply power to the load device. The current flow direction is as shown by the solid arrow in FIG. 6. Figure 2

[0074] In this mode, when the commercial power supply is normal and the electricity price is lower than a preset value, or when the power supply time belongs to the preset time period, the control module controls the switch 4 and the switch 5 to be closed, controls the third switch 24 to be open, and controls the first switch 21 and the second switch 23 to be closed, so as to connect the commercial power supply to the static bypass switch module 2. Then, the commercial power supply is used to supply power to the load device, and the energy storage battery cluster 11 of each energy storage inverter module 1 is charged by using the commercial power supply.

[0075] Mode 3: the commercial power supply is used to supply power to the load device, and the medium-voltage uninterrupted power supply system is maintained.

[0076] ​​In this mode, when the static bypass switch module 2, the energy storage battery cluster 11 or the high-voltage cascade inverter 12 of each energy storage inverter module 1 fails, the control module controls at least one of the switches 4, the first switch 21, the bypass switch 22 or the second switch 23 to be open, and the third switch 24 to be open, and the maintenance bypass switch 3 to be closed, so that the load device is powered by the commercial power supply and the maintenance bypass switch 3, and the energy storage inverter module 2 is in a power-off state, facilitating the maintenance of the medium-voltage uninterrupted power system. The current flow direction is shown by the dotted arrows in the figure.

[0077] Mode four, the load device is powered by the commercial power supply, but the energy storage battery cluster 11 is not charged.

[0078] In this mode, the control module controls the switches 4 and 5 to be closed, at least one of the first switch 21 or the second switch 23 to be open, and the third switch 24 to be closed, so that the load device is powered by the commercial power supply, but the energy storage battery cluster 11 of the energy storage inverter module 1 is not charged.

[0079] With this scheme, by controlling the time period of charging the energy storage battery cluster, the purpose of reducing the operating cost of the data center is achieved.

[0080] Optionally, in the above embodiments, each phase of the high-voltage cascade inverter 12 of the energy storage inverter module 1 includes a plurality of H-bridge power units, and the H-bridge power units are connected in series. For example, please refer to Figure 4 , Figure 4 is a schematic diagram of an energy storage inverter module of a medium-voltage uninterrupted power system provided by the embodiments of the present application.

[0081] Please refer to Figure 4 , each phase of the high-voltage cascade inverter 12 is composed of a plurality of H-bridge power units connected in series, the energy storage battery cluster 11 includes a plurality of battery groups, each H-bridge power unit is connected to a battery group, and an H-bridge power unit and a battery group form a module, realizing modular design, directly outputting a voltage of 6-35kV to save a step-up transformer, and each battery group does not need to operate in parallel, so there is no current sharing problem, improving the system efficiency.

[0082] The number of H-bridge power units can be adjusted according to the voltage level of the power supply side, the module composed of the H-bridge power unit and the battery group can be redundantly designed and contain a bypass circuit, and if a module fails, it can be automatically switched to the bypass, thereby achieving the purpose of improving the reliability of the system.

[0083] In the above embodiments, the medium-voltage uninterruptible power system includes an energy storage inverter module, which includes an energy storage battery cluster and a high-voltage cascaded inverter. However, the embodiments of this application are not limited. For example, in other embodiments, the medium-voltage uninterruptible power system does not include the energy storage inverter module 1, but includes multiple energy storage modules 6, which include an energy storage group 61, an energy storage converter 62, and a safety transformer 63. For example, please refer to... Figure 5 .

[0084] Figure 5 This is another structural schematic diagram of the medium-voltage uninterruptible power system provided in the embodiments of this application. Please refer to... Figure 5 The medium-voltage uninterruptible power system includes multiple energy storage modules 6, static bypass switch module 2, maintenance bypass switch 3, and optionally, switches 4 and 5.

[0085] Please refer to Figure 5 Each energy storage module 6 includes multiple energy storage groups 61, multiple energy storage converters 62, and a safety transformer 63. In each energy storage module 61, the energy storage battery cluster 611 and the DC-DC converter 612 are connected in series. The output terminal of each DC-DC converter 612 is connected to the input terminal of the energy storage converter 62, and the output terminal of each energy storage converter 62 is connected to the input terminal of the safety transformer 63. The output terminal of the safety transformer 63 of each energy storage module 6 is connected to the output terminal of the static bypass switch module 2.

[0086] Figure 5 The diagram only shows two energy storage modules 6. In practice, the number of energy storage modules 6 can be adjusted according to the power of the load equipment.

[0087] Figure 5 In this embodiment, a short-time backup power module and a low-voltage uninterruptible power supply (UPS) are installed between the output terminal of the safety transformer and the load device. However, in this embodiment, the short-time backup power module and the low-voltage UPS may not be installed between the output terminal of the safety transformer and the load device, i.e., the low-voltage UPS and short-time backup power are omitted. For example, please refer to... Figure 6 .

[0088] Figure 6 This is another structural schematic diagram of the medium-voltage uninterruptible power system provided in the embodiments of this application. Please refer to... Figure 6 The safety transformer's output terminal is not equipped with a short-time backup power module and a low-voltage uninterruptible power supply between itself and the load equipment.

[0089] In the embodiments of this application, Figure 5 and Figure 6 The medium-voltage uninterruptible power system shown is related to... Figure 1 and Figure 2 Similar to the medium-voltage uninterruptible power system shown, it can also have multiple power supply methods.

[0090] For example, the load device is powered by the energy storage module 6. The current flow direction is shown by the dashed arrow in FIG. 6. Figure 5 and Figure 6 .

[0091] For another example, the load device is powered by the utility power supply. Meanwhile, the energy storage battery cluster 611 in the energy storage module 6 is charged by the utility power supply. The current flow direction is shown by the solid arrow in FIG. 7. Figure 5 and Figure 6 .

[0092] For yet another example, the load device is powered by the utility power supply, and the medium-voltage uninterruptible power system is under maintenance. The current flow direction is shown by the dotted arrow in FIG. 8. Figure 5 and Figure 6 .

[0093] For still another example, the load device is powered by the utility power supply, but the energy storage battery cluster 611 in the energy storage module 6 is not charged.

[0094] For details, refer to the description of the above-mentioned modes 1-4 for the load device in the above-mentioned embodiments, which will not be repeated here. Figure 1 and Figure 2 .

[0095] Based on the above-mentioned medium-voltage uninterruptible power system, the embodiments of the present application further provide a data center room for accommodating load devices, wherein the load devices are powered by the above-mentioned medium-voltage uninterruptible power system. Based on the medium-voltage uninterruptible power system, the indoor space of the data center room can be saved, and the out-of-cabinet rate can be improved.

[0096] The embodiments of the present application further provide a computer readable storage medium, wherein the computer readable storage medium stores computer instructions, and the computer instructions are executed by a processor to implement the above-mentioned power supply method.

[0097] The embodiments of the present application further provide a computer program product, wherein the computer program product contains a computer program, and the computer program is executed by a processor to implement the above-mentioned power supply method.

[0098] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application indicated by the following claims.

[0099] It is to be understood that the application is not limited to the precise construction already described above and shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application should only be limited by the claims appended hereto.

Claims

1. A medium voltage uninterruptible power system, characterized by The system comprises: a plurality of energy storage inverter modules (1) and a static bypass switch module (2), each of the energy storage inverter modules (1) comprising an energy storage battery cluster (11) and a high-voltage cascaded inverter (12), wherein: the energy storage battery cluster (11) of each of the energy storage inverter modules (1) is connected to the high-voltage cascaded inverter (12); a first port of the high-voltage cascaded inverter (12) of each of the energy storage inverter modules (1) is connected to an output of the static bypass switch module (2); an input of the static bypass switch module (2) is connected to a commercial power supply, and an output of the static bypass switch module (2) is a power supply end for supplying power to load devices in a data center room; each phase of the high-voltage cascaded inverter (12) is composed of a plurality of H-bridge power units connected in series, the energy storage battery cluster (11) comprises a plurality of battery groups, and each H-bridge power unit is connected to a battery group.

2. The system of claim 1, wherein, Further comprising: a maintenance bypass switch (3) connected in parallel with the static bypass switch module (2), the maintenance bypass switch (3) comprising at least a medium-voltage circuit breaker.

3. The system of claim 1, wherein the static bypass switch module (2) comprises a first switch (21), a bypass switch (22), a second switch (23), and a third switch (24), the first switch (21), the bypass switch (22), and the second switch (23) are connected in series, and the third switch (24) is connected in parallel with the first switch (21), the bypass switch (22), and the second switch (23).

4. The system of claim 3, wherein the bypass switch (22) comprises at least a bidirectional semiconductor.

5. The system of any one of claims 1-4, wherein an output of the static bypass switch module (2) is connected to an input of at least one safety transformer, an output of the safety transformer is connected to the load devices, and no short-time backup power module and low-voltage uninterruptible power supply is arranged between the output of the safety transformer and the load devices.

6. The system of any one of claims 1-4, wherein the energy storage battery cluster (11) comprises lithium batteries or lead-carbon batteries.

7. The system of any one of claims 1-4, wherein an output voltage of the first port of the high-voltage cascaded inverter (12) is the same as an output voltage of the commercial power supply.

8. A data center room, characterized by The system comprises: a room, wherein a medium-voltage uninterruptible power system according to any one of claims 1-7 is arranged in the room.

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