Energy storage inverter, power system and data center machine room

Abstract

The embodiment of the utility model provides an energy storage inverter, a power system and a data center machine room, the energy storage inverter is a three-phase inverter, and the A phase, the B phase and the C phase of the energy storage inverter respectively comprise a series group, an inductor and a switch which are sequentially connected in series. Each series group comprises a plurality of power modules which are sequentially connected in series, and each power module comprises an H-bridge power unit and a battery pack connected to the H-bridge power unit. The tail end of the series group of each phase is sequentially connected with an inductor and a switch, and the head ends of the series groups of each phase are connected. By adopting the scheme, each phase of the energy storage inverter comprises a plurality of power modules which are sequentially connected in series, and each power module comprises the H-bridge power unit and the battery pack connected to the H-bridge power unit, so that the battery packs do not need to run in parallel, the problem of current sharing is avoided, the service life of the battery packs is prolonged, and the service life of the energy storage inverter is prolonged. The purpose of improving the reliability and the safety coefficient of the energy storage inverter is achieved.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of energy storage, and particularly to an energy storage inverter, a power system, and a data center computer room. Background Art

[0002] An energy storage inverter is a power conversion device that converts a DC power supply into an AC power supply, and has broad application prospects in the power system.

[0003] Normally, the energy storage inverter mainly includes a DC part and an AC part. Among them, the DC part mainly includes a filter, a battery pack, etc., and the AC part includes an inverter and a step-up transformer, etc. During the working process, the direct current is converted into alternating current through the inverter, and then a stable AC power supply is output through the filter and the step-up transformer.

[0004] However, the battery pack of the above-mentioned energy storage inverter has unbalanced current and poor balance, resulting in a short service life of the battery pack, and further resulting in poor reliability and low safety factor of the energy storage inverter. Utility Model Content

[0005] Embodiments of the present application provide an energy storage inverter, a power system, and a data center computer room. Each phase of the energy storage inverter includes a plurality of power modules connected in series in sequence. Each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit, so that the battery packs do not need to operate in parallel, thereby avoiding the problem of current sharing. While achieving the purpose of increasing the service life of the battery pack, the reliability and safety factor of the energy storage inverter are improved.

[0006] In a first aspect, embodiments of the present application provide an energy storage inverter. The energy storage inverter is a three-phase inverter. The A phase of the three-phase inverter includes: a first series group, a first inductor, and a first switch connected in series in sequence; the B phase of the three-phase inverter includes: a second series group, a second inductor, and a second switch connected in series in sequence; the C phase of the three-phase inverter includes: a third series group, a third inductor, and a third switch connected in series in sequence; where:

[0007] The first series group, the second series group, and the third series group respectively include a plurality of power modules connected in series in sequence. Each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit;

[0008] The first end of the first switch is connected to the first inductor, the first end of the second switch is connected to the second inductor, the first end of the third switch is connected to the third inductor, and the second ends of the first switch, the second switch, and the third switch are connected;

[0009] The first end of the first series group, the first end of the second series group, and the first end of the third series group are connected. The second end of the first series group is connected to the first inductor, the second end of the second series group is connected to the second inductor, and the second end of the third series group is connected to the third inductor.

[0010] In a second aspect, an embodiment of the present application provides a power system, including a first bypass switch and a plurality of energy storage inverters as described in the first aspect or various possible implementation manners of the first aspect. The input end of the first bypass switch is connected to a mains power supply. The second ends of the first switch, the second switch, and the third switch of each energy storage inverter are connected to the output end of the first bypass switch. The output end of the first bypass switch is a power supply end for supplying power to load devices in a data center computer room.

[0011] In a third aspect, an embodiment of the present application provides a data center computer room, including a computer room, in which a power system as described in the second aspect or various possible implementation manners of the second aspect is provided.

[0012] The energy storage inverter, power system, and data center computer room provided by the embodiments of the present application. The energy storage inverter is a three-phase inverter. The A phase, B phase, and C phase of the energy storage inverter each include a series group, an inductor, and a switch connected in series in sequence. Each series group includes a plurality of power modules connected in series in sequence, and each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit. The ends of the series groups of each phase are connected to the inductor and the switch in sequence, and the heads of the series groups of each phase are connected. Adopting this solution, each phase of the energy storage inverter includes a plurality of power modules connected in series in sequence, and each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit, so that the battery packs do not need to operate in parallel, and thus the current sharing problem will not occur, achieving the purpose of improving the battery pack life while improving the reliability and safety factor of the energy storage inverter. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 is a schematic structural diagram of the energy storage inverter provided by the embodiment of the present application;

[0015] Figure 2 is another schematic structural diagram of the energy storage inverter provided by the embodiment of the present application;

[0016] Figure 3 It is a schematic diagram of the H-bridge power unit of the energy storage inverter provided by an embodiment of the present application;

[0017] Figure 4 It is a schematic structural diagram of the energy storage inverter provided by an embodiment of the present application;

[0018] Figure 5 It is a schematic structural diagram of the power system provided by an embodiment of the present application;

[0019] Figure 6 It is another schematic structural diagram of the power system provided by an embodiment of the present application. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings. Relative position terms in space used in the present application, such as "upper", "above", "lower", "below", "first end", "second end", "one end", "the other end", etc., are for the purpose of facilitating description to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The relative position terms in space may be intended to include different orientations of the device in use or operation other than the orientation shown in the figures. For example, if the device in the figure is flipped, the unit described as being "below" or "beneath" other units or features will be located "above" other units or features. Therefore, the exemplary term "below" can encompass both the upper and lower orientations. The device can be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptive terms used herein can be interpreted accordingly.

[0021] In addition, the terms "installed", "set up", "provided with", "connected", "slidingly connected", "fixed", "socketed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0022] The energy storage inverter can realize the conversion of high-voltage high-power direct current into alternating current, and has a wide range of applications in industrial production and daily life.

[0023] In traditional energy storage inverters, multiple battery packs are connected in parallel, resulting in unbalanced current, poor battery balance, short battery pack life, and further poor reliability and low safety factor of the energy storage inverter. Among them, current imbalance refers to the imbalance of the three-phase current of the energy storage inverter, that is, the three-phase output values or phase angles of the current are not equal.

[0024] Based on this, embodiments of the present application provide an energy storage inverter, a power system, and a data center computer room. Each phase of the energy storage inverter includes a plurality of power modules connected in series in sequence. Each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit, such that the battery packs do not need to operate in parallel, thereby avoiding the current sharing problem. While achieving the purpose of extending the lifespan of the battery packs, the reliability and safety factor of the energy storage inverter are improved.

[0025] Figure 1 is a schematic structural diagram of the energy storage inverter provided by an embodiment of the present application. Please refer to Figure 1 , the energy storage inverter provided by an embodiment of the present application is a three-phase inverter. The A phase of the three-phase inverter includes: a first series group 1, a first inductor 2, and a first switch 3 connected in series in sequence; the B phase of the three-phase inverter includes: a second series group 4, a second inductor 5, and a second switch 6 connected in series in sequence; the C phase of the three-phase inverter includes: a third series group 7, a third inductor 8, and a third switch 9 connected in series in sequence; where:

[0026] The first series group 1 includes a plurality of power modules 11 connected in series in sequence. Each power module 11 includes an H-bridge power unit 111 and a battery pack 112 connected to the H-bridge power unit 111.

[0027] The second series group 4 includes a plurality of power modules 41 connected in series in sequence. Each power module 41 includes an H-bridge power unit 411 and a battery pack 412 connected to the H-bridge power unit 411.

[0028] The third series group 7 includes a plurality of power modules 71 connected in series in sequence. Each power module 71 includes an H-bridge power unit 711 and a battery pack 712 connected to the H-bridge power unit 711.

[0029] The first end of the first switch 3 is connected to the first inductor 2, the first end of the second switch 6 is connected to the second inductor 5, the first end of the third switch 9 is connected to the third inductor 8, and the second ends of the first switch 3, the second switch 6, and the third switch 9 are connected and form a voltage output terminal.

[0030] The first ends of the first series group 1, the second series group 4, and the third series group 7 are connected. The second end of the first series group 1 is connected to the first inductor 2, the second end of the second series group 4 is connected to the second inductor 5, and the second end of the third series group 7 is connected to the third inductor 8.

[0031] Please refer to Figure 1, the energy storage inverter is a three-phase inverter. In the three-phase inverter, the series groups, inductors, and switches are connected in series in sequence for the A-phase, B-phase, and C-phase respectively. Each series group includes multiple power modules connected in series in sequence, and each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit. Since in the series group of each phase of the energy storage inverter, the power modules are connected in series in sequence, the battery packs do not need to operate in parallel, so that the energy storage inverter will not have a current sharing problem. Moreover, each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit, realizing modular design and achieving the purpose of simplifying the structure of the energy storage inverter.

[0032] During operation, after the direct current from the battery pack reaches the H-bridge power unit, opposite voltages are output at both ends of the H-bridge power unit. Multiple H-bridge power units are connected in series, which can expand the level number of the energy storage inverter, thereby obtaining a better output waveform and efficiency. The alternating current output by the H-bridge power unit is filtered by an inductor and then output.

[0033] Please refer to Figure 1 , the number of power modules included in each of the A-phase, B-phase, and C-phase of the energy storage inverter is the same, and the number of power modules can be adjusted according to the voltage level on the power supply side.

[0034] The energy storage inverter provided by the embodiment of the present application is a three-phase inverter. The A-phase, B-phase, and C-phase of the energy storage inverter each include a series group, an inductor, and a switch connected in series in sequence. Each series group includes multiple power modules connected in series in sequence, and each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit. The ends of the series group of each phase are connected to the inductor and the switch in sequence, and the heads of the series group of each phase are connected. Adopting this solution, each phase of the energy storage inverter includes multiple power modules connected in series in sequence, and each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit, so that the battery packs do not need to operate in parallel, thus avoiding the current sharing problem, achieving the purpose of improving the battery pack life while improving the reliability and safety factor of the energy storage inverter.

[0035] Optionally, the above-mentioned energy storage inverter further includes multiple redundant modules. Exemplarily, please refer to Figure 2 . Figure 2 is another structural schematic diagram of the energy storage inverter provided by the embodiment of the present application.

[0036] Please refer to Figure 2 , the energy storage inverter provided in this embodiment further includes multiple redundant modules. Specifically, the A-phase of the energy storage inverter includes multiple redundant modules 10, the redundant modules 10 correspond to the power modules 11 one by one, the redundant modules 10 are connected in parallel with the corresponding power modules 11, and the redundant modules 10 include an H-bridge power unit and a battery pack connected to the H-bridge power unit.

[0037] Similarly, the B-phase of the energy storage inverter includes a plurality of redundant modules 20, the redundant modules 20 and the power modules 41 are in one-to-one correspondence, the redundant modules 20 are connected in parallel with the corresponding power modules 41, and the redundant modules 20 include an H-bridge power unit and a battery pack connected to the H-bridge power unit.

[0038] Similarly, the C-phase of the energy storage inverter includes a plurality of redundant modules 30, the redundant modules 30 and the power modules 71 are in one-to-one correspondence, the redundant modules 30 are connected in parallel with the corresponding power modules 71, and the redundant modules 30 include an H-bridge power unit and a battery pack connected to the H-bridge power unit.

[0039] Please refer to Figure 2 , each redundant module is connected in series with a switch. When the power module corresponding to the redundant module is normal, the switch is turned off, so that the power module works, but the redundant module is in a standby state. When the power module fails, the corresponding switch automatically closes, so that the redundant module connected in parallel with the power module works. The redundant module can be called the bypass of the corresponding power module.

[0040] Adopting this solution, by configuring a redundant module for each power module, when a power failure occurs, it automatically switches to the bypass, achieving the purpose of improving the reliability of the energy storage inverter.

[0041] Figure 3 is a schematic diagram of the H-bridge power unit of the energy storage inverter provided by the embodiment of the present application. Please refer to Figure 3 , the H-bridge power unit includes a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4, where: the collector of the first transistor Q1 is connected to the collector of the third transistor Q3 and then connected to the first end of the filter capacitor; the connection point between the emitter of the first transistor Q1 and the collector of the second transistor Q2 forms the first output end of the H-bridge power unit; the emitters of the second transistor Q2 and the fourth transistor Q4 are connected and then connected to the second end of the filter capacitor; the connection point between the emitter of the third transistor Q3 and the collector of the fourth transistor Q4 forms the second output end of the H-bridge power unit.

[0042] Please refer to Figures 1 to 3, each phase of the energy storage inverter includes a series group, the series group includes a plurality of power modules connected in series in sequence, each power module includes an H-bridge power unit and a battery pack, and each H-bridge power unit includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4 and a filter capacitor C. During the working process, by changing the states and conduction sequences of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4, the energy storage inverter can output the required voltage. When the first transistor Q1 and the fourth transistor Q4 are conducting, but the second transistor Q2 and the third transistor Q3 are off, the output voltage is a positive voltage; when the first transistor Q1 and the fourth transistor Q4 are off, but the second transistor Q2 and the third transistor Q3 are conducting, the output voltage is a negative voltage. Each H-bridge power unit generates voltages that are staggered by a certain angle, and the voltages staggered by a certain angle are superimposed to obtain the total voltage output by the series group.

[0043] Please refer to Figure 3 , the more power modules cascaded in a series group, the closer the waveform of the output voltage of the series group is to a sine wave, and the less harmonic content the output voltage contains.

[0044] Adopting this solution, an H-bridge power unit includes four transistors and a filter capacitor, with a simple structure and low cost.

[0045] Optionally, in the above embodiment, the first transistor, the second transistor, the third transistor, and the fourth transistor are insulated gate bipolar transistors or metal oxide semiconductor field effect transistors.

[0046] Exemplarily, each transistor included in the H-bridge power unit is, for example, an insulated gate bipolar transistor (Insulate-Gate Bipolar Transistor, IGBT) or a metal oxide semiconductor field effect transistor (Metal Oxide Semiconductor Filed Effect Transistor, MOSFET). Among them, the insulated gate bipolar transistor is, for example, a silicon insulated gate bipolar transistor, etc., and the embodiments of the present application do not limit it. The metal oxide semiconductor field effect transistor is, for example, a silicon carbide metal oxide semiconductor field effect transistor, a gallium nitride metal oxide semiconductor field effect transistor, etc., and the embodiments of the present application do not limit it.

[0047] Adopting this solution, each transistor included in the H-bridge power unit is, for example, an insulated gate bipolar transistor or a metal oxide semiconductor field effect transistor, with a simple structure and low cost.

[0048] Optionally, in the above embodiment, the output voltage of the energy storage inverter is the same as the output voltage of the mains power supply, so as to omit the step-up transformer for each phase of the energy storage inverter.

[0049] Exemplarily, the output voltage of the energy storage inverter is the same as that of the mains power supply, and can be designed to be 6 - 35 kV, for example, and can be matched according to the mains power supply.

[0050] Adopting this solution, the output voltage of the energy storage inverter is the same as that of the mains power supply, so that there is no need to set up a step-up transformer for the energy storage transformer, achieving the purpose of improving the system efficiency and reducing the cost of the energy storage transformer.

[0051] Optionally, in the above embodiments, the battery pack includes lithium batteries or lead-carbon batteries.

[0052] Exemplarily, the battery pack is composed of series-connected storage batteries with a long cycle life such as lithium batteries or lead-carbon batteries, and the battery capacity can be adjusted according to actual needs.

[0053] Adopting this solution, the battery pack is composed of storage batteries with a long cycle life such as lithium batteries or lead-carbon batteries, achieving the purpose of improving the stability of the energy storage inverter while having high environmental protection performance.

[0054] Optionally, in the above embodiments, the above energy storage inverter further includes a plurality of isolation conversion units. Exemplarily, please refer to Figure 4 . Figure 4 is a schematic structural diagram of an energy storage inverter provided by an embodiment of the present application.

[0055] Please refer to Figure 4 , the energy storage inverter provided by an embodiment of the present application further includes a plurality of isolation conversion units. Specifically, the A phase of the energy storage inverter includes a plurality of isolation conversion units 113, the isolation conversion units 113 correspond to the power modules 11 one by one, and the isolation conversion units 113 are arranged between the H-bridge power unit 111 of the power module 11 and the battery pack 112.

[0056] Similarly, the B phase of the energy storage inverter includes a plurality of isolation conversion units 413, the isolation conversion units 413 correspond to the power modules 41 one by one, and the isolation conversion units 413 are arranged between the H-bridge power unit 411 of the power module 41 and the battery pack 412.

[0057] Similarly, the C phase of the energy storage inverter includes a plurality of isolation conversion units 713, the isolation conversion units 713 correspond to the power modules 71 one by one, and the isolation conversion units 713 are arranged between the H-bridge power unit 711 of the power module 71 and the battery pack 712.

[0058] Please refer to Figure 4, The isolation conversion unit is also called an isolation (Direct Current / Direct Current, DC / DC) converter, etc. The isolation conversion unit includes a three-phase bridge inverter sub-unit, a high-frequency transformer sub-unit, etc. By implementing the isolation of the two-terminal DC circuit, it provides an isolated DC power supply for the H-bridge power unit.

[0059] Adopting this solution, by setting an isolation conversion unit between the H-bridge power unit included in the power module and the battery pack to provide an isolated DC unit for the H-bridge, the result is simple and the cost is low.

[0060] Based on the above energy storage converter, an embodiment of the present application further provides a power system. This power system includes a first bypass switch and multiple energy storage inverters as described in any one of the above embodiments. Exemplarily, please refer to Figure 5 .

[0061] Figure 5 It is a schematic structural diagram of the power system provided by the embodiment of the present application. Please refer to Figure 5 , This power system includes: a first bypass switch 40 and multiple energy storage inverters. The input end of the first bypass switch 40 is connected to the mains power supply. The second ends of the first switch 3, the second switch 6, and the third switch 9 of each energy storage inverter are connected to the output end of the first bypass switch 40. The output end of the first bypass switch 40 is the power supply end for supplying power to the load equipment in the data center computer room.

[0062] Please refer to Figure 5 , When the mains power supply is normal, the first bypass switch 40, the switch 50, and the switch 60 are turned on, so that the mains power supply is connected to the load equipment, and the mains power supply supplies power to the load equipment through the output end of the first bypass switch 40. At the same time, if the first switch 3, the second switch 6, and the third switch 9 of each energy storage inverter are closed, the energy storage inverter is in the charging state, so that the mains power supply charges the battery packs in each series group of each energy storage inverter.

[0063] When the mains power supply is abnormal, at least one of the first bypass switch 40, the switch 50, and the switch 60 is turned off, so that the mains power supply is disconnected from the load equipment. At this time, the first switch 3, the second switch 6, and the third switch 9 of each energy storage inverter are closed, and the energy storage inverter is in the discharging state, so that each energy storage inverter supplies power to the load equipment.

[0064] When the mains power supply is normal and the first bypass switch 40, the switch 50, and the switch 60 are turned on, if it is only desired to supply power to each load equipment by the mains power supply but not to charge the energy storage inverter, the first switch 3, the second switch 6, and the third switch 9 of each energy storage inverter are turned off, so that the mains power supply only supplies power to the load equipment but does not charge the energy storage inverter.

[0065] The power system provided by the embodiment of the present application includes a plurality of energy storage inverters and a first bypass switch. The input end of the first bypass switch is connected to the mains power supply. The second ends of the first switch, the second switch, and the third switch of each energy storage inverter are connected to the output end of the first bypass switch. The output end of the first bypass switch is the power supply end for supplying power to the load devices in the data center computer room. Adopting this solution, the power system stores energy through the energy storage inverter, realizes the uninterrupted switching between the power system and the mains power supply, and further realizes the purpose of improving the reliability of the power system.

[0066] Optionally, the power system described in the above embodiment further includes: a second bypass switch connected in parallel with the first bypass switch, and the second bypass switch at least includes a medium-voltage circuit breaker. Exemplarily, please refer to Figure 6 .

[0067] Figure 6 is another structural schematic diagram of the power system provided by the embodiment of the present application. Please refer to Figure 6 , on the basis of the above Figure 5 , the power system further includes a second bypass switch 70.

[0068] Please refer to Figure 6 , the second bypass switch 70 is connected in parallel with the first bypass switch 40, and the second bypass switch 70 mainly includes a medium-voltage circuit breaker, etc. When the mains power supply is normal, that is, when the mains power supply side is normal, if the energy storage inverter fails and needs to be repaired, the second bypass switch 70 is closed. At this time, at least one of the switch 50, the switch 60, and the first bypass switch 40 is disconnected, and the mains power supply supplies power to the load devices in the data center computer room through the second bypass switch 70.

[0069] Adopting this solution, by setting a second bypass switch connected in parallel with the first bypass switch, when the energy storage inverter needs to be repaired, the second bypass switch is disconnected, and the branch where the second bypass switch is located supplies power to the end load devices, which is convenient for the energy storage inverter to be repaired, and the circuit is simple and the cost is low.

[0070] Based on the above energy storage inverter and power system, the embodiment of the present application further provides a data center computer room, which is used to accommodate load devices, and these load devices are powered by the above power system including an energy storage inverter.

[0071] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0072] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A energy storage inverter, characterized in that, The energy storage inverter is a three-phase inverter. The A phase of the three-phase inverter includes: a first series group, a first inductor, and a first switch connected in series in sequence; the B phase of the three-phase inverter includes: a second series group, a second inductor, and a second switch connected in series in sequence; the C phase of the three-phase inverter includes: a third series group, a third inductor, and a third switch connected in series in sequence; where: The first series group, the second series group, and the third series group respectively include a plurality of power modules connected in series in sequence. Each power module includes an H-bridge power unit and a battery pack connected to the H-bridge power unit. The first end of the first switch is connected to the first inductor, the first end of the second switch is connected to the second inductor, the first end of the third switch is connected to the third inductor, and the second ends of the first switch, the second switch, and the third switch are connected. The first ends of the first series group, the second series group, and the third series group are connected. The second end of the first series group is connected to the first inductor, the second end of the second series group is connected to the second inductor, and the second end of the third series group is connected to the third inductor.

2. The energy storage inverter according to claim 1, characterized in that, It further includes: A plurality of redundant modules, which correspond to the power modules one by one. The redundant modules are connected in parallel with the corresponding power modules. The redundant modules include H-bridge power units and battery packs connected to the H-bridge power units.

3. The energy storage inverter according to claim 1, characterized in that The H-bridge power unit includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a filter capacitor, where: The collector of the first transistor is connected to the collector of the third transistor and then connected to the first end of the filter capacitor; The connection point between the emitter of the first transistor and the collector of the second transistor forms the first output end of the H-bridge power unit; The emitters of the second transistor and the fourth transistor are connected and then connected to the second end of the filter capacitor; The connection point between the emitter of the third transistor and the collector of the fourth transistor forms the second output end of the H-bridge power unit.

4. The energy storage inverter according to claim 3, wherein The first transistor, the second transistor, the third transistor, and the fourth transistor are insulated gate bipolar transistors or metal oxide semiconductor field effect transistors.

5. The energy storage inverter according to any one of claims 1 to 4, wherein The output voltage of the energy storage inverter is the same as the output voltage of the mains power supply, so that a step-up transformer can be omitted for each phase of the energy storage inverter.

6. The energy storage inverter according to any one of claims 1 to 4, wherein The battery pack includes lithium batteries or lead-carbon batteries.

7. The energy storage inverter according to any one of claims 1 to 4, characterized in that, It further includes: A plurality of isolation conversion units, which correspond to the power modules one by one and are arranged between the H-bridge power unit of the power module and the battery pack.

8. A power system, characterized in that, Includes: A first bypass switch and a plurality of energy storage inverters as described in any one of claims 1 to 7, wherein the input end of the first bypass switch is connected to the mains power supply, the second ends of the first switches, the second ends of the second switches, and the second ends of the third switches of each energy storage inverter are connected to the output end of the first bypass switch, and the output end of the first bypass switch is a power supply end for supplying power to the load devices in the data center computer room.

9. The power system according to claim 8, wherein, Further comprising: A second bypass switch connected in parallel with the first bypass switch, and the second bypass switch at least includes a medium-voltage circuit breaker.

10. A data center computer room, characterized in that, Comprising: A computer room, in which the power system as described in claim 8 or 9 is provided.

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