Energy storage power electronic transformer assembly, energy storage device and energy storage system

Abstract

The invention provides an energy storage power electronic transformer assembly, an energy storage device and an energy storage system, the energy storage power electronic transformer assembly comprises an inversion unit, the input end of the inversion unit is used for direct current input; and the input end of the voltage transformation unit is connected to the output end of the inversion unit, and the output end of the voltage transformation unit is used for power output. According to the energy storage power electronic transformer assembly provided by the invention, compared with the prior art that an energy storage converter is adopted to perform conversion adjustment and control on current, the size and the cost can be effectively reduced, and under the condition that the energy storage power electronic transformer assembly is applied to an energy storage system, the size and the cost of the energy storage system can be effectively reduced; and miniaturization design and cost reduction of energy storage equipment are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to an energy storage power electronic transformer assembly, an energy storage device and an energy storage system. Background Art

[0002] In related technologies, such as Figure 1 As shown, the energy storage system is composed of a battery 102', an energy storage converter 104', an industrial frequency transformer 106' and a power grid 108'. That is, the energy storage system in the related art converts, regulates and controls the electric energy through the energy storage converter 104'. However, the energy storage system has many components, a large volume and a high cost, which is not conducive to the miniaturization design and cost reduction of the energy storage system. Summary of the invention

[0003] The present invention aims to at least solve the technical problems of large size and high cost of energy storage systems existing in the prior art.

[0004] To this end, a first aspect of the present invention provides an energy storage power electronic transformer assembly.

[0005] A second aspect of the present invention provides an energy storage device.

[0006] A third aspect of the present invention provides an energy storage system.

[0007] The present invention provides an energy storage power electronic transformer assembly, comprising: an inverter unit, the input end of the inverter unit is used for direct current input; a transformer unit, the input end of the transformer unit is connected to the output end of the inverter unit, and the output end of the transformer unit is used for power output.

[0008] The energy storage power electronic transformer assembly provided by the present invention comprises an inverter unit and a transformer unit, wherein the input end of the inverter unit is used for DC input, that is, the input end of the inverter unit can be connected to a DC power supply of DC input. Specifically, the DC power supply can be an energy storage battery, and the inverter unit is used to convert the DC power provided by the DC power supply, thereby converting the DC power into AC power.

[0009] Furthermore, the input end of the transformer unit is connected to the output end of the inverter unit, so that the AC power output by the inverter unit can be transformed and frequency-converted by the transformer unit, and then the parameters of the AC power are adjusted by the transformer unit to output power to meet the needs of the power grid. Specifically, the output end of the transformer unit is used for power output, so that the transformed and frequency-converted AC power is transmitted to the power grid to provide the required electrical energy for the power grid.

[0010] Compared to the related art that uses energy storage converters to convert, regulate and control current, the present application uses an inverter unit to convert current to achieve conversion between direct current and high-frequency alternating current, and uses a transformer unit to adjust the frequency of the voltage of the high-frequency alternating current to ensure that the transmitted electric energy can be applied to the power grid. The structures of the inverter unit and the transformer unit are relatively simple compared to the energy storage converter, and the volume is relatively small. At the same time, the cost of the inverter unit and the transformer unit is also relatively low. That is, the energy storage power electronic transformer assembly provided by the present application can effectively reduce the volume and cost compared to the energy storage converter and transformer solutions in the related art. When the energy storage power electronic transformer assembly is applied to the energy storage system, the volume and cost of the energy storage system can be effectively reduced, which is conducive to the miniaturization design and cost reduction of the energy storage equipment.

[0011] In addition, the energy storage power electronic transformer assembly in the above technical solution provided by the present invention may also have the following additional technical features: In some technical solutions, optionally, the inverter unit includes: an inverter, the input end of the inverter is used for DC input, and the output end of the inverter is connected to the input end of the transformer unit; wherein the inverter is used to convert the DC input into low-voltage and high-frequency AC power.

[0012] In this technical solution, the inverter unit may include an inverter, that is, the inverter can be used to convert direct current into low-voltage and high-frequency alternating current. The input end of the inverter is used for direct current input, that is, the input end of the inverter is connected to a direct current power source, that is, connected to a battery, and the output end of the inverter is connected to the transformer unit, so that the converted low-voltage and high-frequency alternating current is transmitted to the transformer unit for frequency conversion and voltage conversion.

[0013] Specifically, the inverter may be a DC-low voltage high frequency inverter, so that the inverter can convert the DC power provided by the DC power supply into low voltage high frequency AC power to ensure the efficiency of current conversion and the stability during the conversion process.

[0014] In some technical solutions, optionally, the transformation unit includes: a high-frequency transformer, an input end of the high-frequency transformer is connected to an output end of the inverter; wherein the high-frequency transformer is used to convert low-voltage and high-frequency alternating current into high-voltage and high-frequency alternating current.

[0015] In this technical solution, the transformer unit may include a high-frequency transformer, through which the voltage of the low-voltage high-frequency AC power transmitted by the inverter unit can be converted, thereby converting the low-voltage high-frequency AC power into high-voltage high-frequency AC power. This ensures that the voltage of the AC power output by the energy storage power electronic transformer assembly can meet the needs of the power grid, that is, to ensure that the voltage of the AC power transmitted to the power grid can meet the use requirements of the electrical equipment in the power grid.

[0016] In some technical solutions, optionally, the transformation unit also includes: a converter, the input end of the converter is connected to the output end of the high-frequency transformer, and the output end of the converter is used for power output; wherein the converter is used to convert high-voltage and high-frequency alternating current into industrial frequency alternating current.

[0017] In this technical solution, the transformation unit may further include a converter, through which the frequency of the high-frequency and high-voltage alternating current output by the high-frequency transformer may be adjusted to ensure that the frequency of the alternating current output to the power grid can meet the needs of the power grid.

[0018] Specifically, the input end of the converter is connected to the high-frequency transformer to ensure that the converter can receive the high-voltage and high-frequency AC output by the high-frequency transformer. Furthermore, the output end of the converter is used for power output, so that the frequency-converted AC can be transmitted to the power grid to be used by the electrical equipment in the power grid. Among them, the converter can convert the high-voltage and high-frequency AC output by the high-frequency transformer into industrial frequency AC, so as to meet the needs of the power grid.

[0019] In some technical solutions, optionally, the converter has multiple output terminals, and the multiple output terminals are used to output power respectively.

[0020] In this technical solution, the number of output terminals of the converter can be multiple, that is, the multiple output terminals of the converter can output electricity separately, that is, the multiple output terminals of the converter can be connected to multiple power grids at the same time, so that the energy storage power electronic transformer assembly can provide industrial frequency AC power to multiple power grids at the same time. In order to meet the power demand of multiple power grids at the same time and improve the operating efficiency of the energy storage power electronic transformer assembly. In other words, when the energy storage power electronic transformer assembly is applied to the energy storage system, the power supply efficiency of the energy storage system can be effectively improved.

[0021] According to a second aspect of the present invention, an energy storage device is proposed, comprising an energy storage power electronic transformer assembly as described in any one of the above technical solutions.

[0022] The energy storage device proposed in the present invention includes the energy storage power electronic transformer assembly of any one of the above technical solutions, so the energy storage device has all the beneficial effects of the above energy storage power electronic transformer assembly, which will not be repeated here.

[0023] In some technical solutions, optionally, the energy storage device also includes: an energy storage battery, and the energy storage battery is connected to the input end of the inverter unit.

[0024] In this technical solution, the energy storage device may also include an energy storage battery, which is connected to the input end of the inverter unit of the energy storage power electronic transformer assembly to provide electric energy for the energy storage power electronic transformer assembly. The energy storage power electronic transformer assembly converts the direct current provided by the energy storage battery into industrial frequency alternating current, which is then transmitted to the power grid to meet the power demand of the power grid.

[0025] According to a third aspect of the present invention, an energy storage system is proposed, comprising an energy storage device as described in any one of the above technical solutions.

[0026] The energy storage system proposed in the present invention includes the energy storage device of any one of the above technical solutions, so the energy storage system has all the beneficial effects of the above energy storage device and energy storage power electronic transformer assembly, which will not be repeated here.

[0027] In some technical solutions, optionally, there are multiple energy storage devices, the multiple energy storage devices are connected in parallel, and the output ends of the multiple energy storage devices are connected to the power grid.

[0028] In this technical solution, the number of energy storage devices in the energy storage system can be multiple, and multiple energy storage devices are connected in parallel. By setting the number of energy storage devices to multiple, and connecting multiple energy storage devices in parallel, and connecting the output end of the energy storage device to the power grid at the same time, the amount of electricity that the energy storage system can provide can be effectively increased, so that the energy storage system can stably provide electricity to the power grid for a long time, ensuring the sustainable operation of the energy storage system.

[0029] In some technical solutions, optionally, there are multiple energy storage devices, the multiple energy storage devices are connected in series, and the output end of one of the multiple energy storage devices is connected to the power grid.

[0030] In this technical solution, the number of energy storage devices in the energy storage system can be multiple, and the multiple energy storage devices are connected in series. By setting the number of energy storage devices to multiple, and connecting the multiple energy storage devices in series, on the one hand, the amount of electricity that the energy storage system can provide can be increased, thereby meeting the continuous power supply of the energy storage system. On the other hand, the voltage that the energy storage system can provide can also be increased, thereby further meeting the different power requirements of the power grid.

[0031] Specifically, since multiple energy storage devices are connected in series, the grid can be connected to the output end of any energy storage device in the energy storage system according to the voltage value required by the grid to adjust the voltage output by the energy storage system and meet the power demand of different grids.

[0032] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 A schematic diagram of the structure of an energy storage system in the related art is shown; Figure 2 One of the structural schematic diagrams of the energy storage power electronic transformer assembly according to an embodiment of the present invention is shown; Figure 3 for Figure 2 A circuit topology diagram of an inverter unit in an energy storage power electronic transformer assembly of the illustrated embodiment; Figure 4 for Figure 2 A circuit topology diagram of a converter in an energy storage power electronic transformer assembly of the illustrated embodiment; Figure 5 A second structural schematic diagram of an energy storage power electronic transformer assembly according to an embodiment of the present invention is shown; Figure 6 for Figure 5 A circuit topology diagram of a converter in an energy storage power electronic transformer assembly of the illustrated embodiment; Figure 7 One of the structural schematic diagrams of the energy storage device according to an embodiment of the present invention is shown; Figure 8 A second structural schematic diagram of the energy storage device according to an embodiment of the present invention is shown; Fig. 9 One of the structural schematic diagrams of the energy storage system according to an embodiment of the present invention is shown; Fig.10 The second structural schematic diagram of the energy storage system according to the embodiment of the present invention is shown.

[0034] Reference numerals: 102'battery, 104'energy storage converter, 106'power frequency transformer, 108'power grid; 100 energy storage power electronic transformer assembly, 102 inverter unit, 104 transformer unit, 106 inverter, 108 high frequency transformer, 110 converter, 200 energy storage device, 202 energy storage battery, 300 energy storage system, 400 power grid. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0037] Refer to the following Figures 2 to 10 To describe the energy storage power electronic transformer assembly, energy storage device and energy storage system provided according to some embodiments of the present invention.

[0038] The present invention provides an energy storage power electronic transformer assembly 100, such as Figure 2 As shown, the energy storage power electronic transformer assembly 100 includes: an inverter unit 102, the input end of the inverter unit 102 is used for DC input; a transformer unit 104, the input end of the transformer unit 104 is connected to the output end of the inverter unit 102, and the output end of the transformer unit 104 is used for power output.

[0039] like Figure 2 and Figure 3 As shown, the energy storage power electronic transformer assembly 100 provided by the present invention includes an inverter unit 102 and a transformer unit 104, wherein the input end of the inverter unit 102 is used for DC input, that is, the input end of the inverter unit 102 can be connected to a DC power supply with DC input. Specifically, the DC power supply can be an energy storage battery, and the inverter unit 102 is used to convert the DC power provided by the DC power supply, thereby converting the DC power into AC power.

[0040] Furthermore, the input end of the transformer unit 104 is connected to the output end of the inverter unit 102, so that the AC power output by the inverter unit 102 can be transformed and frequency-converted by the transformer unit 104, and then the parameters of the AC power are adjusted by the transformer unit 104 to output power to meet the needs of the power grid. Specifically, the output end of the transformer unit 104 is used for power output, so that the AC power after transformation and frequency conversion is transmitted to the power grid to provide the required electric energy for the power grid.

[0041] Compared with the related art that uses energy storage converters to convert, regulate and control current, the present application uses an inverter unit 102 to convert current to achieve conversion between direct current and alternating current, and uses a transformer unit 104 to adjust the frequency of the voltage of the alternating current to ensure that the transmitted electric energy can be applied to the power grid. The structures of the inverter unit 102 and the transformer unit 104 are relatively simple and small in size compared to the energy storage converter. At the same time, the cost of the inverter unit 102 and the transformer unit 104 is also low. That is, the energy storage power electronic transformer assembly 100 provided by the present application can effectively reduce the volume and cost compared to the energy storage converter in the related art. When the energy storage power electronic transformer assembly 100 is applied to the energy storage system, the volume and cost of the energy storage system can be effectively reduced, which is conducive to the miniaturization design and cost reduction of the energy storage equipment.

[0042] Specifically, Figure 3 As shown, Figure 3 The circuit topology diagram of the inverter unit 102 in the energy storage power electronic transformer assembly 100 of the embodiment of the present application is shown. The circuit topology diagram of the inverter unit 102 shows the conversion process of the direct current output by the direct current power supply into the alternating current. The specific working principle is as follows: DC power input: The input terminal on the left side of the inverter unit 102 is used for DC input, that is, connecting to a DC power supply, marked as “DC+” and “DC-”, which serve as the starting point for the operation of the inverter unit 102 .

[0043] Three-phase rectification and inversion: The inverter unit 102 contains three phases, namely, phase A, phase B and phase C. The DC power output by the DC power supply first undergoes a rectification process, for example, it is converted into pulse direct current (PDC) through a diode in phase A. Then, the pulse direct current is inverted through the switches of the inverter, such as insulated gate bipolar transistors (IGBT), to generate alternating current. The working principles of phases B and C are similar to those of phase A, but their phases differ by 120 degrees, ensuring that the inverter can generate three-phase alternating current.

[0044] AC output: The right side of the inverter unit 102 is the A, B, and C output terminals, which are used to connect to the three-phase load, and in this application serve as the input terminal of the transformer unit 104. After the rectification and inversion process, the inverter unit 102 provides stable three-phase AC power to meet the needs of various load devices.

[0045] Specifically, Figure 4 As shown, Figure 4The circuit topology diagram of the converter 110 in the energy storage power electronic transformer assembly 100 of the embodiment of the present application is shown. The circuit topology diagram of the converter 110 shows the conversion process of converting high-voltage and high-frequency alternating current into industrial frequency alternating current. The specific working principle is as follows: Rectification process: High-voltage and high-frequency AC power is first rectified by capacitors (C phase, B phase, A phase, etc.) to convert AC power into high-frequency DC power. In this process, capacitors play a role in smoothing current and storing charge.

[0046] Energy storage and inversion: The rectified high-frequency DC is stored in an inductor. When the magnetic field energy in the inductor reaches a certain level, the stored DC is inverted into industrial frequency AC through the switching action of the transistor. The transistor plays a switching control role here.

[0047] Current stability: During the inversion process, the diode plays the role of rectification and reverse conduction. When the transistor is turned off, the diode ensures that the current can pass stably, avoiding sudden interruption or reverse flow of the current, thus ensuring the stability and safety of the circuit.

[0048] Voltage Control: Figure 4 The voltage values ​​(such as DC+, DC-, NP, etc.) are also marked, which reflect the voltage distribution and changes in the circuit. By accurately controlling these voltage values, the converter 110 can be ensured to operate stably under different loads and working conditions and meet specific output requirements.

[0049] In some embodiments, optionally, Figure 5 As shown, the inverter unit 102 includes: an inverter 106, the input end of the inverter 106 is used for DC input, and the output end of the inverter 106 is connected to the input end of the transformer unit 104; wherein the inverter 106 is used to convert the DC input into low-voltage high-frequency AC power.

[0050] In this embodiment, the inverter unit 102 may include an inverter 106, that is, the direct current may be converted into alternating current through the inverter 106. The input end of the inverter 106 is used for direct current input, that is, the input end of the inverter is connected to a direct current power source, that is, connected to a battery, and the output end of the inverter 106 is connected to the transformer unit 104, so as to transmit the converted alternating current to the transformer unit 104 for frequency conversion and voltage conversion.

[0051] Specifically, the inverter 106 may be a DC-low voltage high frequency inverter, so that the inverter 106 can convert the DC power provided by the DC power source into low voltage high frequency AC power to ensure the efficiency of current conversion and the stability during the conversion process.

[0052] In some embodiments, optionally, Figure 2 and Figure 5 As shown, the transformer unit 104 includes: a high-frequency transformer 108, the input end of the high-frequency transformer 108 is connected to the output end of the inverter 106; wherein the high-frequency transformer 108 is used to convert low-voltage high-frequency alternating current into high-voltage high-frequency alternating current.

[0053] In this embodiment, the transformer unit 104 may include a high-frequency transformer 108, through which the voltage of the low-voltage high-frequency alternating current transmitted by the inverter unit 102 may be converted, thereby converting the low-voltage high-frequency alternating current into high-voltage high-frequency alternating current. Thus, the voltage of the alternating current output by the energy storage power electronic transformer assembly 100 can meet the needs of the power grid, that is, to ensure that the voltage of the alternating current transmitted to the power grid can meet the use requirements of the electrical equipment in the power grid.

[0054] Furthermore, if Figure 2 and Figure 5 As shown, the transformer unit 104 further includes: a converter 110, the input end of the converter 110 is connected to the output end of the high-frequency transformer 108, and the output end of the converter 110 is used for power output; wherein, the converter 110 is used to convert high-voltage and high-frequency alternating current into industrial frequency alternating current.

[0055] Specifically, the transformation unit 104 may further include a converter 110, through which the frequency of the high-frequency and high-voltage alternating current output by the high-frequency transformer may be adjusted to ensure that the frequency of the alternating current output to the power grid can meet the demand of the power grid.

[0056] Specifically, the input end of the converter 110 is connected to the high-frequency transformer 108 to ensure that the converter 110 can receive the high-voltage and high-frequency AC output by the high-frequency transformer 108. Furthermore, the output end of the converter 110 is used for power output, so that the frequency-converted AC can be transmitted to the power grid to be used by the electrical equipment in the power grid. Among them, the converter 110 can convert the high-voltage and high-frequency AC output by the high-frequency transformer 108 into industrial frequency AC, so as to meet the needs of the power grid.

[0057] Specifically, Figure 6 As shown, Figure 6 Another circuit topology diagram of the converter 110 in the energy storage power electronic transformer assembly 100 of the embodiment of the present application is shown. The circuit topology diagram of the converter 110 shows the conversion process of converting high-voltage and high-frequency alternating current into industrial frequency alternating current, and is similar to the previous Figure 4 The design of the converter 110 shown is different, mainly in its multi-output design, and the specific working principle is as follows: Input and preliminary processing: High-voltage and high-frequency AC power is input and first enters the input terminal of the converter 110. The input current passes through a series of circuit modules, which include inductors, capacitors, etc., for preliminary adjustment of the frequency and voltage of the current.

[0058] Conversion process: Inside the converter, the current is processed through multiple stages, gradually converting from a high-voltage, high-frequency state to a low-voltage, low-frequency industrial frequency AC. This process involves circuit layout and component collaboration to ensure stable conversion and efficient transmission of electrical energy.

[0059] Multiple output terminal design: Multiple output terminals such as A1, A2, B1, B2, C1, C2 can provide stable industrial frequency AC power to multiple power grids at the same time, meeting the power supply of multiple power requirements. The circuit topology structure of the converter 110 of the present application realizes the function of providing stable power support to multiple power grids at the same time through the design of multiple output terminals. This design not only improves the utilization efficiency of electric energy, but also enhances the stability and reliability of power supply.

[0060] In some embodiments, optionally, Figure 4 and Figure 6 As shown, the converter 110 has a plurality of output terminals, and the plurality of output terminals are used to output electric power respectively.

[0061] In this embodiment, the number of output terminals of the converter 110 can be multiple, that is, the multiple output terminals of the converter 110 can output power respectively, that is, the multiple output terminals of the converter 110 can be connected to multiple power grids at the same time, so that the energy storage power electronic transformer assembly 100 can provide industrial frequency AC power to multiple power grids at the same time. In order to meet the power demand of multiple power grids at the same time, the operating efficiency of the energy storage power electronic transformer assembly 100 is improved. That is, when the energy storage power electronic transformer assembly 100 is applied to the energy storage system, the power supply efficiency of the energy storage system can be effectively improved.

[0062] In some embodiments of the present invention, Figure 7 and Figure 8 As shown, an energy storage device 200 is also proposed, comprising an energy storage power electronic transformer assembly 100 as in any one of the above embodiments.

[0063] The energy storage device 200 proposed in the present invention includes the energy storage power electronic transformer assembly 100 of any one of the above embodiments, so the energy storage device 200 has all the beneficial effects of the above energy storage power electronic transformer assembly 100, which will not be repeated here.

[0064] In some embodiments, optionally, Figure 7 and Figure 8As shown, the energy storage device 200 further includes: an energy storage battery 202 , and the energy storage battery 202 is connected to the input end of the inverter unit 102 .

[0065] In this embodiment, the energy storage device 200 may further include an energy storage battery 202, and by connecting the energy storage battery 202 to the input end of the inverter unit 102 of the energy storage power electronic transformer assembly 100, it is possible to provide electric energy for the energy storage power electronic transformer assembly 100. The energy storage power electronic transformer assembly 100 converts the direct current provided by the energy storage battery 202, converts the direct current into industrial frequency alternating current, and then transmits it to the power grid to meet the power demand of the power grid.

[0066] In addition, when the electric energy stored in the energy storage battery 202 is insufficient, electric energy can also be transmitted to the energy storage battery 202 through the power grid, that is, through the energy storage power electronic transformer assembly 100, the industrial frequency alternating current in the power grid is converted into direct current and transmitted to the energy storage battery 202 for storage, so as to charge the energy storage battery 202.

[0067] In some embodiments of the present invention, Fig. 9 and Fig.10 As shown, an energy storage system 300 is also proposed, including an energy storage device 200 as in any one of the above embodiments, and the output end of the energy storage device 200 is used to connect to a power grid 400.

[0068] The energy storage system 300 proposed in the present invention includes the energy storage device 200 of any one of the above embodiments, so the energy storage system 300 has all the beneficial effects of the above energy storage device 200 and the energy storage power electronic transformer assembly 100, which will not be repeated here.

[0069] In some embodiments, optionally, Fig. 9 As shown, there are multiple energy storage devices 200 , the multiple energy storage devices 200 are connected in parallel, and the output ends of the multiple energy storage devices 200 are connected to the power grid 400 .

[0070] In this embodiment, the number of energy storage devices 200 in the energy storage system 300 can be multiple, and multiple energy storage devices 200 are connected in parallel. By setting the number of energy storage devices 200 to multiple, and connecting multiple energy storage devices 200 in parallel, and connecting the output end of the energy storage device 200 to the power grid 400 at the same time, the amount of electricity that the energy storage system 300 can provide can be effectively increased, so that the energy storage system 300 can stably provide electricity to the power grid 400 for a long time, and ensure the sustainable operation of the energy storage system 300.

[0071] In some embodiments, optionally, Fig.10As shown, there are multiple energy storage devices 200 , which are connected in series, and an output end of one of the multiple energy storage devices 200 is connected to the power grid 400 .

[0072] In this embodiment, the number of energy storage devices 200 in the energy storage system 300 may be multiple, and the multiple energy storage devices 200 are connected in series. By setting the number of energy storage devices 200 to be multiple, and connecting the multiple energy storage devices 200 in series, on the one hand, the amount of electricity that can be provided by the energy storage system 300 can be increased, thereby satisfying the continuous power supply of the energy storage system 300. On the other hand, the voltage of the electric energy that can be provided by the energy storage system 300 can also be increased, thereby further satisfying the different power requirements of the power grid 400.

[0073] Specifically, since multiple energy storage devices 200 are connected in series, the grid 400 can be connected to the output end of any energy storage device 200 in the energy storage system 300 according to the voltage value required by the grid 400, so as to adjust the voltage output by the energy storage system 300 and meet the power demand of different grids 400.

[0074] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. The terms "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An energy storage power electronic transformer assembly, characterized in that: include: An inverter unit, wherein an input end of the inverter unit is used for direct current input; A transformer unit, wherein the input end of the transformer unit is connected to the output end of the inverter unit, and the output end of the transformer unit is used for power output.

2. The energy storage power electronic transformer assembly according to claim 1, characterized in that: The inverter unit comprises: An inverter, wherein an input end of the inverter is used for direct current input, and an output end of the inverter is connected to an input end of the transformer unit; Wherein, the inverter is used to convert the DC input into low-voltage and high-frequency AC power.

3. The energy storage power electronic transformer assembly according to claim 2, characterized in that: The transformer unit comprises: A high frequency transformer, wherein the input end of the high frequency transformer is connected to the output end of the inverter; Wherein, the high-frequency transformer is used to convert the low-voltage high-frequency alternating current into high-voltage high-frequency alternating current.

4. The energy storage power electronic transformer assembly according to claim 3, characterized in that: The transformer unit further comprises: A converter, wherein the input end of the converter is connected to the output end of the high-frequency transformer, and the output end of the converter is used for power output; Wherein, the converter is used to convert the high-voltage and high-frequency alternating current into industrial frequency alternating current.

5. The energy storage power electronic transformer assembly according to claim 4, characterized in that: The converter has a plurality of output terminals, and the plurality of output terminals are used for respectively outputting electric power.

6. An energy storage device, characterized in that: include: An energy storage power electronic transformer assembly as claimed in any one of claims 1 to 5.

7. The energy storage device according to claim 6, characterized in that: Also includes: An energy storage battery is connected to an input end of the inverter unit.

8. An energy storage system, characterized in that: include: The energy storage device according to claim 6 or 7, wherein the output end of the energy storage device is used to be connected to a power grid.

9. The energy storage system according to claim 8, characterized in that: There are multiple energy storage devices, and the multiple energy storage devices are connected in parallel. The output ends of the multiple energy storage devices are connected to the power grid.

10. The energy storage system according to claim 8, characterized in that: There are multiple energy storage devices, which are connected in series, and an output end of one of the multiple energy storage devices is connected to the power grid.

Images