Solid-state transformer power unit and substation

Abstract

This application discloses a solid-state transformer power unit and a substation, belonging to the field of power technology. The solid-state transformer power unit includes a separately packaged high-voltage input module, an intermediate isolation module, and a low-voltage output module. The high-voltage input module includes a first housing, within which a rectifier submodule, an inverter submodule, and a DC support capacitor bank are connected in parallel. The first and second input terminals of the rectifier submodule extend from the first housing, as do the first and second output terminals of the inverter submodule. The low-voltage output module has the same structure as the high-voltage input module. The intermediate isolation module is located between the high-voltage input module and the low-voltage output module, and includes a second housing, within which a high-frequency transformer is located. The first, second, first, and second input terminals of the high-frequency transformer extend from the second housing. Embodiments of this application can reduce the installation and maintenance difficulty of the solid-state transformer power unit and the substation.

Description

Technical Field

[0001] The present application belongs to the field of electric power technology, and in particular relates to a solid-state transformer power unit and a substation. Background Art

[0002] With the development of power grid technology and the growth of demand for electric energy, the functional limitations of industrial frequency power transformers, as key equipment of the power grid, are becoming increasingly obvious, making it difficult to meet the development requirements of the power grid. Solid-state transformers are a new type of controllable power transformer that combines power electronic conversion technology with medium and high frequency electromagnetic coupling technology. They can interconnect transmission and distribution networks of different voltage levels and meet the development requirements of the power grid.

[0003] The solid-state transformer can be composed of multiple packaged power units. The high-voltage input stage circuit, the intermediate isolation stage circuit and the low-voltage output stage circuit are packaged into one power unit. Since the circuit structure in the power unit is relatively large, the power unit is large in size, making the installation and maintenance of the power unit more difficult. Summary of the invention

[0004] The embodiments of the present application provide a solid-state transformer power unit and a substation, which can reduce the difficulty of installing and maintaining the power unit and the substation.

[0005] In a first aspect, an embodiment of the present application provides a solid-state transformer power unit, comprising a separately packaged high-voltage input module, an intermediate isolation module and a low-voltage output module; the high-voltage input module comprises a first shell, and a rectifier module, an inverter module and a DC support capacitor group connected in parallel in the first shell; the first input end and the second input end of the rectifier module extend from the first shell, and the first output end and the second output end of the inverter module extend from the first shell; the low-voltage output module has the same structure as the high-voltage input module; the intermediate isolation module is located between the high-voltage input module and the low-voltage output module, and the intermediate isolation module comprises a second shell, and a high-frequency transformer located in the second shell; the first input end, the second input end, the first output end and the second output end of the high-frequency transformer extend from the second shell, and the first input end and the second input end of the high-frequency transformer are respectively electrically connected to the first output end and the second output end of the inverter module in the high-voltage input module, and the first output end and the second output end of the high-frequency transformer are respectively electrically connected to the first input end and the second input end of the rectifier module in the low-voltage output module.

[0006] In some possible embodiments, the high-voltage input module further includes a water cooling structure located in the first shell.

[0007] In some possible embodiments, the water cooling structure includes a water cooling plate, the water cooling plate has a water inlet and a water outlet, the water inlet and the water outlet extend out of the first shell, the rectifier module and the inverter module are arranged on one side of the water cooling plate, and the DC support capacitor group is located on the other side of the water cooling plate; the water inlet of the water cooling plate in the high-voltage input module is connected to the water outlet of the water cooling plate in the low-voltage output module through a first connecting water pipe.

[0008] In some possible embodiments, the high-voltage input module also includes a laminated busbar located in the first shell, the laminated busbar is connected to the DC support capacitor group, the laminated busbar is also connected to the rectifier module and the inverter module, and the laminated busbar is perpendicular to the plane formed by the rectifier module and the inverter module.

[0009] In some possible embodiments, the rectifier submodule includes two half-bridge IGBT device groups, and the inverter submodule includes two half-bridge IGBT device groups.

[0010] In some possible embodiments, the high-voltage input module further includes a drive control circuit board group disposed on a side of the rectifier module and the inverter module facing away from the water cooling plate.

[0011] In some possible embodiments, along the direction of the rectifier module and the inverter module facing away from the water cooling plate, the drive control circuit board group includes a first drive circuit board, a second drive circuit board and a control circuit board which are stacked.

[0012] In some possible embodiments, the first driving circuit board includes first circuits corresponding to the respective half-bridge IGBT device groups, and each first circuit is electrically connected to two first wiring terminals on the first driving circuit board.

[0013] In some possible embodiments, the second driver circuit board includes isolation drivers corresponding to each half-bridge IGBT device group, and each isolation driver is electrically connected to two second terminals and one third terminal on the second driver circuit board, and is electrically connected to the first terminal and the second terminal corresponding to the same half-bridge IGBT device group.

[0014] In some possible embodiments, the control circuit board includes a control circuit, four fourth terminals electrically connected to the control circuit, and a communication port connected to the control circuit, the fourth terminals are electrically connected to the third terminals in a one-to-one correspondence, and an opening corresponding to the communication port is provided on the first shell.

[0015] In some possible embodiments, the high voltage input module further includes a power supply, which is disposed adjacent to the drive control circuit board group, and is electrically connected to the laminated busbar and the control circuit board, respectively.

[0016] In some possible embodiments, the first input end and the second input end of the high-frequency transformer are provided with isolation sheds.

[0017] In a second aspect, an embodiment of the present application provides a solid-state transformer substation, comprising an outer shell, a supporting structure arranged inside the outer shell, a three-phase inductor, a water cooling cabinet, a control cabinet, a three-phase power unit group arranged on the supporting structure, and a heat exchanger arranged on the outside of the outer shell and connected to the water cooling cabinet through a heat exchange water inlet pipe and a heat exchange water outlet pipe; each phase power unit group includes N solid-state transformer power units in the first aspect, where N is an integer greater than or equal to 2.

[0018] In some possible embodiments, the first phase power unit group and the second phase power unit group are arranged sequentially, the third phase power unit group and the second phase power unit group are arranged side by side, and the three-phase reactor and the first phase power unit group are arranged side by side.

[0019] In some possible embodiments, in each phase power unit group, the first input end of the rectifier module in the first high-voltage input module is electrically connected to the corresponding one-phase reactor, the first input end of the rectifier module in the i-th high-voltage input module is electrically connected to the second input end of the rectifier module in the i-1-th high-voltage input module through a first connecting bar, 1<i≤N, and the first output end of the inverter module in each low-voltage output module is electrically connected through a second connecting bar, and the second connecting bar is configured to be electrically connected to the corresponding one-phase low-voltage incoming line;

[0020] The second input end of the rectifier module in the Nth high-voltage input module of the three-phase power unit group is electrically connected through the third connecting bar, and the second output end of the inverter module in each low-voltage output module of the three-phase power unit group is electrically connected through the fourth connecting bar, and the fourth connecting bar is grounded.

[0021] In some possible embodiments, the three-phase reactor, the first-phase power unit group, the second-phase power unit group, and the third-phase power unit group are arranged in sequence; and the solid-state transformer power units in each phase power unit group are arranged in two columns.

[0022] In some possible embodiments, in each phase power unit group, the first input end of the rectifier module in the first high-voltage input module is electrically connected to the corresponding one-phase reactor, the first input end of the rectifier module in the j-th high-voltage input module is electrically connected to the second input end of the rectifier module in the j-1-th high-voltage input module through the fifth connecting bar, 1<j≤N, the first output end of the inverter module in each low-voltage output module is electrically connected through the sixth connecting bar, and the sixth connecting bar is electrically connected to the corresponding one-phase low-voltage incoming line;

[0023] The second input end of the rectifier module in the Nth high-voltage input module of the three-phase power unit group is electrically connected through the seventh connecting bar, and the second output end of the inverter module in each low-voltage output module of the three-phase power unit group is electrically connected through the eighth connecting bar, and the eighth connecting bar is grounded;

[0024] The first input end of the rectifier module in the Nth high-voltage input module of the first-phase power unit group is connected to the first input end of the rectifier module in the first high-voltage input module of the second-phase power unit group; the first input end of the rectifier module in the Nth high-voltage input module of the second-phase power unit group is connected to the first input end of the rectifier module in the first high-voltage input module of the third-phase power unit group; the first input end of the rectifier module in the Nth high-voltage input module of the third-phase power unit group is connected to the first input end of the rectifier module in the first high-voltage input module of the first-phase power unit group.

[0025] In some possible embodiments, the solid-state transformer substation also has a first main water outlet pipe located above each high-voltage input module and arranged around the three-phase power unit group, and a first main water inlet pipe located below each low-voltage output module and arranged around each three-phase power unit group. The first main water outlet pipe and the first main water inlet pipe lead into the water cooling cabinet. The first main water outlet pipe is provided with first branch water outlets corresponding to each high-voltage input module one by one. The water outlet of the water cooling plate in each high-voltage input module is connected to the corresponding first branch water outlet through a second connecting water pipe. The first main water inlet pipe is provided with first branch water inlets corresponding to each low-voltage output module one by one. The water inlet of the water cooling plate in each low-voltage output module is connected to the corresponding first branch water inlet through a third connecting water pipe.

[0026] In some possible embodiments, the solid-state transformer substation further comprises a second main water outlet pipe arranged above a row of high-voltage input modules, a third main water outlet pipe arranged above another row of high-voltage input modules, a second main water inlet pipe arranged below a row of low-voltage output modules, and a third main water inlet pipe arranged below another row of low-voltage output modules. The second main water outlet pipe, the second main water inlet pipe, the third main water outlet pipe, and the third main water inlet pipe are connected to the water cooling cabinet. The second main water outlet pipe is provided with a second branch water outlet corresponding to a row of high-voltage input modules one by one. The water outlet of the water cooling plate in a row of high-voltage input modules is connected to the corresponding second branch water outlet through a fourth connecting water pipe. The second main water inlet pipe is provided with a second branch water inlet corresponding to a row of low-pressure output modules one by one, the water inlet of the water-cooled plate in the row of low-pressure output modules is connected with the corresponding second branch water inlet through a fifth connecting water pipe, the third main water outlet pipe is provided with a third branch water outlet corresponding to another row of high-pressure input modules one by one, the water outlet of the water-cooled plate in the row of high-pressure input modules is connected with the corresponding third branch water outlet through a sixth connecting water pipe, the third main water inlet pipe is provided with a third branch water inlet corresponding to another row of low-pressure output modules one by one, the water inlet of the water-cooled plate in the other row of low-pressure output modules is connected with the corresponding third branch water inlet through a seventh connecting water pipe.

[0027] In some possible embodiments, the supporting structure includes an upper support and a lower support, the high-voltage input module in the solid-state transformer power unit is arranged on the upper support, and the intermediate isolation module and the low-voltage output module in the solid-state transformer power unit are arranged on the lower support.

[0028] In some possible embodiments, the upper support is an insulating support.

[0029] In some possible embodiments, the support structure further includes a support base, and the support base supports the lower support.

[0030] In some possible embodiments, a plurality of bushings passing through the outer shell are provided on the outer shell, and each of the three-phase high-voltage incoming lines enters the outer shell through a bushing and is electrically connected to the corresponding single-phase inductor, and each of the three-phase low-voltage incoming lines enters the outer shell through a bushing and is electrically connected to the first output end of the inverter submodule in the low-voltage output module of the corresponding single-phase power unit group.

[0031] In some possible embodiments, the communication port in the high voltage input module in each phase power unit group is connected to the control cabinet via a first communication link, and the communication port in the low voltage output module in each phase power unit group is connected to the control cabinet via a second communication link.

[0032] The solid-state transformer power unit and substation of the embodiment of the present application, the solid-state transformer power unit includes a separately packaged high-voltage input module, an intermediate isolation module and a low-voltage output module, and the first input end and the second input end of the rectifier module in the high-voltage input module extend from the first housing. The first output end and the second output end of the inverter module in the high-voltage input module extend from the first housing and are electrically connected to the first input end and the second input end of the high-frequency transformer in the intermediate isolation module. The low-voltage output module has the same structure as the high-voltage input module. The first input end and the second input end of the rectifier module in the low-voltage output module extend from the first housing and are electrically connected to the first output end and the second output end of the high-frequency transformer in the intermediate isolation module. The first output end and the second output end of the inverter module in the low-voltage output module extend from the first housing. The high-voltage input module, the intermediate isolation module and the low-voltage output module are each separately packaged, which realizes the modular design of the solid-state transformer power unit and reduces the installation difficulty and maintenance difficulty of the solid-state transformer power unit and the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1A schematic diagram of the electrical structure of an embodiment of a solid-state transformer power unit provided by the present application;

[0035] Figure 2 A schematic diagram of the electrical structure of an embodiment of a three-phase solid-state transformer provided by the present application;

[0036] Figure 3 A schematic structural diagram of an embodiment of a solid-state transformer power unit provided by the present application;

[0037] Figure 4 A structural schematic diagram of an example of at least a portion of the structure in the first housing of a high-voltage input module provided in an embodiment of the present application;

[0038] Figure 5 A structural schematic diagram of another example of at least a portion of the structure in the first housing of the high-voltage input module provided in an embodiment of the present application;

[0039] Figure 6 for Figure 5 A schematic structural diagram of at least a portion of the structure in the first housing of the high-voltage input module shown in another angle;

[0040] Figure 7 A structural block diagram of an example of a first driving circuit board, a second driving circuit board and a control circuit board provided in an embodiment of the present application;

[0041] Figure 8 A schematic diagram of the positions of an example of a first driver circuit board, a second driver circuit board, a control circuit board and a half-bridge IGBT device group provided in an embodiment of the present application;

[0042] Fig. 9 A schematic structural diagram of an example of an intermediate isolation module provided in an embodiment of the present application;

[0043] Fig.10 A structural schematic diagram of an embodiment of a solid-state transformer substation provided by the present application;

[0044] Fig.11 for Fig.10 A cross-sectional structural diagram of a solid-state transformer substation is shown;

[0045] Fig.12 A schematic structural diagram of an example of a three-phase power unit group and a water cooling part provided in an embodiment of the present application;

[0046] Fig.13 for Fig.12 A schematic structural diagram of an example of a three-phase power unit group and a water cooling part at another angle shown;

[0047] Fig.14A partial schematic diagram of an example of a partial water cooling part and a solid-state transformer power unit provided in an embodiment of the present application;

[0048] Fig.15 A schematic diagram of an example of connection of a solid-state transformer power unit in a three-phase power unit group provided in an embodiment of the present application;

[0049] Fig.16 A schematic structural diagram of an example of a support structure provided in an embodiment of the present application;

[0050] Fig.17 A structural schematic diagram of another embodiment of a solid-state transformer substation provided by the present application;

[0051] Fig.18 for Fig.17 A cross-sectional structural diagram of a solid-state transformer substation is shown;

[0052] Fig.19 A schematic structural diagram of another example of a three-phase power unit group and a water cooling part provided in an embodiment of the present application;

[0053] Fig. 20 A partial schematic diagram of another example of a partial water cooling portion and a solid-state transformer power unit provided in an embodiment of the present application;

[0054] Fig.21 A schematic diagram of another example of connection of a solid-state transformer power unit in a three-phase power unit group provided by an embodiment of the present application;

[0055] Fig. 22 for Fig.21 A schematic diagram of the connection of a solid-state transformer in one phase power unit group in a three-phase power unit group is shown;

[0056] Fig.23 A schematic structural diagram of another example of a support structure provided in an embodiment of the present application;

[0057] Fig.24 A schematic diagram of an example of a fiber optic communication link between a fiber optic transceiver and a control cabinet provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0059] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0060] Solid-state transformers are a new type of controllable power transformer that combines power electronic conversion technology with medium and high frequency electromagnetic coupling technology. They can interconnect transmission and distribution networks of different voltage levels, and can also provide plug-and-play interfaces for distributed power sources and energy storage devices. Solid-state transformers can also realize continuous on-load voltage regulation, power quality control, two-level grid flexible connectors, grid decoupling control, short-circuit current blockers, high and low voltage double-sided static synchronous compensators (STATCOM), self-healing safety devices, safety and stability system execution terminals, new energy grid connection interfaces, and other functions. Due to the above advantages, the application scope of solid-state transformers is becoming more and more extensive.

[0061] Solid-state transformers can be composed of multiple packaged power units. The high-voltage input stage circuit, the intermediate isolation stage circuit, and the low-voltage output stage circuit are packaged into one power unit. However, due to the complex circuit structure and the large number of components, the power unit is large in size, making it difficult to install and maintain.

[0062] The present application provides a solid-state transformer power unit and a substation, in which a high-voltage input stage circuit, an intermediate isolation stage circuit and a low-voltage output stage circuit are separately encapsulated, that is, the solid-state transformer power unit is a separate structure, thereby reducing the difficulty of installation, maintenance and other aspects.

[0063] The following describes the electrical structure of the solid-state transformer power unit and the three-phase solid-state transformer. The three-phase solid-state transformer in the embodiment of the present application is an AC-AC solid-state transformer, and correspondingly, the solid-state transformer power unit is an AC-AC solid-state transformer power unit.

[0064] Figure 1This is a schematic diagram of the electrical structure of an embodiment of a solid-state transformer power unit provided by the present application. Figure 1 As shown, the solid-state transformer power unit may include a high-voltage input stage circuit, an intermediate isolation stage circuit, and a low-voltage output stage circuit. The high-voltage input stage circuit is packaged as a high-voltage input module 11, the intermediate isolation stage circuit is packaged as an intermediate isolation module 12, and the low-voltage output circuit is packaged as a low-voltage output module 13. The internal structure of the low-voltage input stage circuit is the same as that of the high-voltage input stage circuit, but the parameters, models, etc. of the components in the low-voltage input stage circuit and the high-voltage input stage circuit are not limited here.

[0065] The high voltage input module 11 includes a rectifier module, an inverter module and a DC support capacitor group connected in parallel. The rectifier module 111 includes two half-bridge insulated gate bipolar transistor (IGBT) device groups 113. The inverter module 112 includes two half-bridge IGBT device groups 113. Each half-bridge IGBT device group 113 includes two IGBT devices connected in series. For example, Figure 1 As shown, the rectifier module 111 includes IGBT devices T1, T2, T3 and T4, and the inverter module 112 includes IGBT devices T5, T6, T7 and T8. The connection method of the IGBT devices in the rectifier module 111 and the inverter module 112 is as follows: Figure 1 The DC support capacitor group in the high voltage input module 11 may include more than one capacitor, and the number and capacitance of the capacitors in the DC support capacitor group are not limited here. Figure 1 As shown, the DC support capacitor group in the high-voltage input module 11 includes a capacitor C1.

[0066] The intermediate isolation module 12 includes a high-frequency transformer M1. The high-frequency transformer M1 can be a high-isolation high-frequency transformer M1. The isolation voltage level of the high-frequency transformer M1 can be determined according to the voltage level of the input side (i.e., the high-voltage side) of the high-voltage input module 11, which is not limited here. For example, the distribution network voltage on the input side of the high-voltage input module 11 is 10KV, i.e., 10 kilovolts. Correspondingly, the isolation voltage level of the high-frequency transformer M1 can be determined according to 10KV.

[0067] The structure of the low voltage output module 13 is the same as that of the high voltage input module 11. The low voltage output module 13 includes a rectifier module 131, an inverter module 132 and a DC support capacitor group connected in parallel. The rectifier module 131 includes two half-bridge IGBT device groups 133. The inverter module 132 includes two half-bridge IGBT device groups 133. Each half-bridge IGBT device group 133 includes two IGBT devices connected in series. For example, Figure 1As shown, the rectifier module 131 includes IGBT devices T9, T10, T11 and T12, and the inverter module 132 includes IGBT devices T13, T14, T15 and T16. The connection method of the IGBT devices in the rectifier module 131 and the inverter module 132 is as follows: Figure 1 The DC support capacitor group in the low voltage output module 13 may include more than one capacitor, and the number and capacitance of the capacitors in the DC support capacitor group are not limited here. Figure 1 As shown, the DC support capacitor group in the low voltage output module 13 includes a capacitor C2.

[0068] Figure 2 This is a schematic diagram of the electrical structure of an embodiment of a three-phase solid-state transformer provided by the present application. Figure 2 As shown, the three-phase solid-state transformer may include a three-phase power unit group. Each phase power unit group includes more than two solid-state transformer power units.

[0069] like Figure 2 As shown, in a single-phase power unit group, the first input end of the first solid-state transformer power unit can be connected to a phase of the high-voltage side power grid through a reactor, the second input end of the first solid-state transformer power unit is connected to the first input end of the second solid-state transformer power unit, the second input end of the second solid-state transformer power unit is connected to the first input end of the third solid-state transformer power unit, and so on. In a single-phase power unit group, the first output end of each solid-state transformer power unit is connected and connected to a phase of the low-voltage power grid. For example, in Figure 2 In the first phase power unit group, the first input end of the first solid-state transformer power unit is connected to the first phase of the high-voltage side power grid through the first phase reactor L1. In the second phase power unit group, the first input end of the first solid-state transformer power unit is connected to the second phase of the high-voltage side power grid through the second phase reactor L2. In the third phase power unit group, the first input end of the first solid-state transformer power unit is connected to the third phase of the high-voltage side power grid through the third phase reactor L3.

[0070] The second input end of the last solid-state transformer power unit in each phase power unit group is connected to form a neutral point on the high voltage side. The second output ends of each solid-state transformer power unit in each phase power unit group are connected to form a neutral point on the low voltage side, and the neutral point on the low voltage side can be grounded to the low voltage side.

[0071] The input of the solid-state transformer power unit in the power unit group is connected in series, which can increase the voltage level of the three-phase solid-state transformer. The output of the solid-state transformer power unit in the power unit group is connected in parallel, which can increase the current level of the three-phase solid-state transformer. The number of solid-state transformer power units in the power unit group can be determined according to the voltage level of the solid-state transformer power unit and the voltage level of the grid side, and is not limited here.

[0072] The specific structure of the solid-state transformer power unit is introduced below. Figure 3 This is a schematic diagram of the structure of an embodiment of a solid-state transformer power unit provided by the present application. Figure 3 As shown, the solid-state transformer power unit includes a separately packaged high-voltage input module 11, an intermediate isolation module 12 and a low-voltage output module 13. The intermediate isolation module 12 is located between the high-voltage input module 11 and the low-voltage output module 13. In the installed state, the solid-state transformer power unit can be vertically installed in three layers. Among them, the high-voltage input module 11 is installed on the high layer, the low-voltage output module 13 is installed on the bottom layer, and the intermediate isolation module 12 is installed on the middle layer. The intermediate isolation module 12 is installed on the top of the low-voltage output module 13 to withstand mechanical force. The mechanical force of the high-voltage input module 11 can be borne by the support of the power cabinet in which the solid-state transformer power unit is installed. The intermediate isolation module 12 is connected to the high-voltage input module 11 and the low-voltage output module 13 respectively. The connection between the high-voltage input module 11, the intermediate isolation module 12, and the low-voltage output module 13 can be a detachable connection for easy maintenance.

[0073] Figure 4 This is a schematic diagram of an example of at least a portion of the structure in the first housing of the high-voltage input module provided in an embodiment of the present application. Figure 3 and Figure 4 As shown, the high-voltage input module 11 includes a first housing 211, and a rectifier module 111, an inverter module 112, and a DC support capacitor group connected in parallel in the first housing 211. The first input end 212 and the second input end 213 of the rectifier module 111 extend from the first housing 211, and the first input end 212 of the rectifier module 111 can be used as the first input end of the high-voltage input module 11, and the second input end 213 of the rectifier module 111 can be used as the second input end of the high-voltage input module 11. The first output end 214 and the second output end 215 of the inverter module 112 extend from the first housing 211, and the first output end 214 of the inverter module 112 can be used as the first output end of the high-voltage input module 11, and the second output end 215 of the inverter module 112 can be used as the second output end of the high-voltage input module 11. The first output end of the rectifier module 111 is connected to the first input end of the inverter module 112 , and the second output end of the rectifier module 111 is connected to the second input end of the inverter module 112 .

[0074] In some examples, the high-voltage input module 11 may further include a water-cooling structure located within the first housing 211. The water-cooling structure may include a water-cooling plate 216. The water-cooling plate 216 has a water inlet 217 and a water outlet 218. The water inlet 217 and the water outlet 218 of the water-cooling plate 216 extend out of the first housing 211. The coolant may flow into the water-cooling plate 216 through the water inlet 217 and flow out of the water-cooling plate 216 through the water outlet 218. The rectifier module 111 and the inverter module 112 are disposed on one side of the water-cooling plate 216. Specifically, the rectifier module 111 and the inverter module 112 may be disposed on one side of the water-cooling plate 216. The heat generated by the rectifier module 111 and the inverter module 112 may be dissipated to the water-cooling plate 216 and carried away by the coolant flowing through the water-cooling plate 216. When the solid-state transformer power unit is in a vertical installation state, the water cooling plate 216 is placed vertically, the water inlet 217 is located at the lower end of the water cooling plate 216 , and the water outlet 218 is located at the upper end of the water cooling plate 216 .

[0075] The water inlet 217 of the water cooling plate 216 in the high-voltage input module 11 and the water outlet of the water cooling plate 216 in the low-voltage output module 13 can be connected through the first connecting water pipe. The coolant flows through the water inlet of the water cooling plate in the low-voltage output module 13, the water cooling plate in the low-voltage output module 13, the water outlet of the water cooling plate in the low-voltage output module 13, the first connecting water pipe, the water inlet 217 of the water cooling plate 216 in the high-voltage input module 11, the water cooling plate 216 in the high-voltage input module 11, and the water outlet of the water cooling plate 216 in the high-voltage input module 11. The water cooling structure can dissipate heat for the high-voltage input module and the low-voltage output module to improve the safety and reliability of the solid-state transformer power unit.

[0076] like Figure 4 As shown, when the rectifier module 111 and the inverter module 112 are arranged on one side of the water cooling plate 216, the DC support capacitor group 114 can be located on the other side of the water cooling plate 216. That is, the water cooling plate 216 can be arranged between the DC support capacitor group 114 and the rectifier module 111 and the inverter module 112.

[0077] In some examples, the high-voltage input module 11 also includes a laminated busbar 219 located in the first housing 211. The laminated busbar 219 may specifically include a laminated positive busbar and a negative busbar. The laminated busbar 219 is connected to the DC support capacitor group 114. The laminated busbar 219 is also connected to the rectifier module 111 and the inverter module 112. The parallel connection of the rectifier module 111, the inverter module 112, and the DC support capacitor group 114 is achieved through the laminated busbar 219. For compact design, the laminated busbar 219 is perpendicular to the plane formed by the rectifier module 111 and the inverter module 112. That is, the laminated busbar 219 can be vertically connected and installed with the rectifier module 111 and the inverter module 112 including the half-bridge IGBT device group 113.

[0078] Figure 5 A schematic structural diagram of another example of at least a portion of the structure within the first shell of the high-voltage input module provided in an embodiment of the present application. Figure 6 for Figure 5 The schematic diagram of the structure of at least part of the first shell of the high-voltage input module is shown in another angle. Figure 5 and Figure 6 As shown, the high-voltage input module 11 further includes a drive control circuit board group disposed on the side of the rectifier module 111 and the inverter module 112 facing away from the water cooling plate 216. Specifically, along the direction of the rectifier module 111 and the inverter module 112 facing away from the water cooling plate 216, the drive control circuit board group includes a first drive circuit board 221, a second drive circuit board 222, and a control circuit board 223 that are stacked.

[0079] The first driving circuit board 221 is electrically connected to the half-bridge IGBT device group 113 in the rectifier module 111 and the half-bridge IGBT device group 113 in the inverter module 112. The second driving circuit board 222 is electrically connected to the first driving circuit board 221. The control circuit board 223 is electrically connected to the second driving circuit board 222. The first driving circuit board 221, the second driving circuit board 222 and the control circuit board 223 jointly realize the driving, control and protection of the rectifier module 111, the inverter module 112 and the like.

[0080] In some examples, the first driver circuit board 221 can be welded to the auxiliary connection terminals of the half-bridge IGBT device group 113 in the rectifier module 111 and the half-bridge IGBT device group 113 in the inverter module 112 through the pads on the first driver circuit board 221.

[0081] In order to facilitate the explanation of the structure and connection relationship of the first drive circuit board 221, the second drive circuit board 222 and the control circuit board 223, the explanation is given through the structural block diagram of the first drive circuit board 221, the second drive circuit board 222 and the control circuit board 223 and their relative positions to the half-bridge IGBT device group 113. Figure 7 This is a structural block diagram of an example of a first driving circuit board, a second driving circuit board and a control circuit board provided in an embodiment of the present application, wherein double arrow lines are used to indicate the connection relationship between the components. Figure 8 A schematic diagram of the positions of an example of a first driver circuit board, a second driver circuit board, a control circuit board and a half-bridge IGBT device group provided in an embodiment of the present application.

[0082] like Figure 7 and Figure 8As shown, in the installed state, the first drive circuit board 221, the second drive circuit board 222 and the control circuit board 223 are installed vertically. They are arranged in order from near to far from the rectifier module 111 and the inverter module 112, namely the first drive circuit board 221, the second drive circuit board 222 and the control circuit board 223.

[0083] The first driving circuit board 221 includes first circuits 227 corresponding to the half-bridge IGBT device groups 113. Each first circuit 227 is electrically connected to two first terminals 228 on the first driving circuit board 221. That is, each half-bridge IGBT device group 113 in the high-voltage input module 11 corresponds to two first terminals 228. One of the two first terminals 228 is an upper bridge arm terminal, and the other is a lower bridge arm terminal. The upper bridge arm terminal is connected to the part of the first circuit 227 related to the upper bridge arm IGBT device in the half-bridge IGBT device group 113, and the lower bridge arm terminal is connected to the part of the first circuit 227 related to the lower bridge arm IGBT device in the half-bridge IGBT device group 113. The first circuit 227 and the corresponding first terminal 228 can be connected through the plate making circuit on the first driving circuit board 221. Other circuits can also be provided on the first driving circuit board 221, which are not limited here. The first driving circuit board 221 can be integrally welded to the half-bridge IGBT device group 113 in the rectifier module 111 and the half-bridge IGBT device group 113 in the inverter module 112 .

[0084] The second driving circuit board 222 includes an isolation driver 230 corresponding to each half-bridge IGBT device group 113. Each isolation driver 230 is electrically connected to two second wiring terminals 229 and one third wiring terminal 231 on the second driving circuit board 222. That is, each half-bridge IGBT device group 113 in the high-voltage input module 11 corresponds to two second wiring terminals 229 and one third wiring terminal 231. The first wiring terminal 228 and the second wiring terminal 229 corresponding to the same half-bridge IGBT device group 113 are electrically connected. One of the two second wiring terminals 229 corresponding to a half-bridge IGBT device group 113 is an upper bridge arm wiring terminal, and the other is a lower bridge arm wiring terminal. Corresponding to the same half-bridge IGBT device group 113, the upper bridge arm wiring terminal in the first driving circuit board 221 is electrically connected to the upper bridge arm wiring terminal in the second driving circuit board 222, and the lower bridge arm wiring terminal in the first driving circuit board 221 is electrically connected to the lower bridge arm wiring terminal in the second driving circuit board 222. The third wiring terminal 231 may include a horn terminal, which is not limited here. The isolation driver 230 on the second driving circuit board 222 can be connected to the corresponding second connection terminal 229 and third connection terminal 231 through the plate-making circuit on the second driving circuit board 222. Other circuits can also be arranged on the second driving circuit board 222, which are not limited here.

[0085] The control circuit board 223 includes a control circuit 233, four fourth wiring terminals 232 electrically connected to the control circuit 233, and a communication port connected to the control circuit 233. The fourth wiring terminals 232 are electrically connected to the third wiring terminals 231 mentioned above in a one-to-one correspondence. A power supply terminal 234 may also be provided on the control circuit board 223, and the power supply terminal 234 is used to connect a power supply end, which may be specifically implemented as a power supply, which is not limited here. The control circuit board 223 may also include isolation drivers corresponding to each half-bridge IGBT device group 113 in the rectifier module 111 and each half-bridge IGBT device group 113 in the inverter module 112, which are not shown in the figure. An opening corresponding to the communication port may be provided on the first shell 211. As shown in FIG. Figure 3 , Figure 7 and Figure 8 As shown, the communication port may include a fiber optic transceiver 224 and other types of communication connectors 225, which are not limited here. The fiber optic transceiver 224 can be divided into a fiber optic receiver 224-1 and a fiber optic transmitter 224-2. The fiber optic transceiver 224 can exchange information with the control system. In the installed state, the fiber optic receiver 224-1 and the fiber optic transmitter 224-2 can be installed vertically and extend out of the first housing 211. The isolation driver 230, the fourth terminal 232, the communication interface and other structures on the control circuit board 223 can be connected through a plate-making circuit. Other circuits can also be set on the control circuit board 223, which are not limited here.

[0086] The circuits on the first driving circuit board 221 include driving circuits, protection circuits, detection circuits, etc. with strong anti-interference capabilities. The circuits on the second driving circuit board 222 include driving circuits, control circuits, feedback short-circuit designs, etc. with weak anti-interference capabilities. It should be noted that the strong and weak anti-interference here are relative. The separate design of the first driving circuit board 221 and the second driving circuit board 222 can effectively isolate strong and weak electricity, thereby improving the reliability of the operation of the IGBT devices in the half-bridge IGBT device group 113. Moreover, the distance between the first driving circuit board 221, the second driving circuit board 222 and the control circuit board 223 is short, the wiring is simple, the complexity of wiring is reduced, and the wiring process is optimized.

[0087] The rectifier module 111, the inverter module 112, the DC support capacitor group 114 and the first drive circuit board 221 in the above embodiment can be used as the power part in the high-voltage input module 11, and the second drive circuit board 222 and the control circuit board 223 can be used as the control part in the high-voltage input module 11.

[0088] In some examples, such as Figure 5 and Figure 6As shown, the high-voltage input module 11 may also include a power supply 226. The power supply 226 is arranged adjacent to the drive control circuit board group. The power supply 226 is electrically connected to the laminated busbar 219 and the control circuit board 223, respectively. In the installed state, the power supply 226 is located above the drive control circuit board group. The power input of the power supply 226 comes from the laminated busbar 219, and takes power from the DC bus. The wiring between the power supply 226 and the laminated busbar 219 is short, and the reliability is high. The power supply 226 supplies power to the control circuit board 223, and can also supply power to other parts of the high-voltage input module 11 that need electricity through the control circuit board 223. The wiring between the power supply 226 and the control circuit board 223 is short, and the reliability is high.

[0089] Fig. 9 This is a schematic diagram of an example of the structure of the intermediate isolation module provided in the embodiment of the present application. Figure 3 and Fig. 9 As shown, the intermediate isolation module 12 includes a second housing 311 and a high-frequency transformer M1 located in the second housing 311 .

[0090] The first input end 312, the second input end 313, the first output end 314 and the second output end 315 of the high-frequency transformer M1 extend from the second housing 311. The first input end 312 and the second input end 313 of the high-frequency transformer M1 are the first input end and the second input end of the intermediate isolation module 12, and the first output end 314 and the second output end 315 of the high-frequency transformer M1 are the first output end and the second output end of the intermediate isolation module 12. The first input end 312 and the second input end 313 of the high-frequency transformer M1 are electrically connected to the first output end 214 and the second output end 215 of the inverter module 112 in the high-voltage input module 11, respectively. The first output end 314 and the second output end 315 of the high-frequency transformer M1 are electrically connected to the first input end and the second input end of the rectifier module 131 in the low-voltage output module 13, respectively. Specifically, the first input terminal 312 of the high-frequency transformer M1 is electrically connected to the first output terminal 214 of the inverter module 112 in the high-voltage input module 11, and the second input terminal 313 of the high-frequency transformer M1 is electrically connected to the second output terminal 215 of the inverter module 112 in the high-voltage input module 11. The first output terminal 314 of the high-frequency transformer M1 is electrically connected to the first input terminal of the rectifier module 131 in the low-voltage output module 13, and the second output terminal 315 of the high-frequency transformer M1 is electrically connected to the second input terminal of the rectifier module 131 in the low-voltage output module 13.

[0091] In some examples, such as Fig. 9As shown, the first input terminal 312 and the second input terminal of the high-frequency transformer M1 are covered with an isolation shed 316. The first input terminal 312 and the second input terminal 313 of the high-frequency transformer M1 are connected to the high-voltage input module 11. The isolation shed 316 can increase the creepage distance between the circuit, wiring, etc. in the high-voltage input module 11 and the high-frequency transformer M1, and can also increase the creepage distance between the circuit, wiring, etc. in the high-voltage input module 11 and the second housing 311, thereby improving the safety and reliability of the solid-state transformer power unit.

[0092] The low voltage output module 13 has the same structure as the high voltage input module 11 . For the specific contents of the low voltage output module 13 , reference may be made to the relevant description of the high voltage input module 11 , which will not be described in detail here.

[0093] In the embodiment of the present application, the solid-state transformer power unit includes a separately packaged high-voltage input module 11, an intermediate isolation module 12, and a low-voltage output module 13. The first input end 212 and the second input end 213 of the rectifier module 111 in the high-voltage input module 11 extend from the first housing 211. The first output end 214 and the second output end 215 of the inverter module 112 in the high-voltage input module 11 extend from the first housing 211 and are electrically connected to the first input end 312 and the second input end 313 of the high-frequency transformer M1 in the intermediate isolation module 12. The low-voltage output module 13 has the same structure as the high-voltage input module 11. The first input end and the second input end of the rectifier module 131 in the low-voltage output module 13 extend from the first housing and are electrically connected to the first output end 314 and the second output end 315 of the high-frequency transformer M1 in the intermediate isolation module 12. The first output end and the second output end of the inverter module 132 in the low-voltage output module 13 extend from the first housing. The high voltage input module 11, the intermediate isolation module 12 and the low voltage output module 13 are each separately packaged, realizing the modular design of the solid-state transformer power unit, reducing the difficulty of installation and maintenance of the solid-state transformer power unit, and also reducing the overall design difficulty of the solid-state transformer power unit.

[0094] The solid-state transformer may include multiple solid-state transformer power units in the above-mentioned embodiment. The electrical connection between the multiple solid-state transformer power units can be seen in Figure 2 The solid-state transformer can be integrated in a solid-state transformer substation. The present application also provides a solid-state transformer substation. Fig.10 This is a schematic structural diagram of an embodiment of a solid-state transformer substation provided in the present application. Fig.11 for Fig.10 The cross-sectional structure diagram of the solid-state transformer substation is shown in FIG. Fig.10 and Fig.11As shown, the solid-state transformer substation may include an outer shell 41, a support structure 42, a three-phase reactor, a water cooling cabinet 43, a control cabinet 44 arranged in the outer shell 41, a three-phase power unit group arranged on the support structure 42, and a heat exchanger 46 arranged on the outer side of the outer shell 41 and connected to the water cooling cabinet 43 through a heat exchange water inlet pipe 461 and a heat exchange water outlet pipe 462. The three-phase power unit group includes a first-phase power unit group 451, a second-phase power unit group 452 and a third-phase power unit group 453.

[0095] A heat exchanger 46 is disposed outside the outer shell 41 of the solid-state transformer substation. Specifically, the heat exchanger 46 can be disposed at the top of the outer shell 41, close to the water cooling cabinet 43. The heat exchanger 46 can cool the coolant with heat generated by the three-phase power unit group entering the heat exchanger 46 through the heat exchange water inlet pipe 461, and then the cooled coolant flows out through the heat exchange water outlet pipe 462 to flow into the water cooling cabinet 43, so that the water cooling cabinet 43 can use the cooled coolant to dissipate heat from the three-phase power unit group. The heat exchanger 46 can specifically include a heat exchange fan, which is not limited here. The control cabinet 44, the water cooling cabinet 43, and the three-phase power unit group disposed on the supporting structure 42 are arranged in sequence.

[0096] In some examples, a plurality of bushings passing through the outer shell 41 may be provided on the outer shell 41. The three-phase high-voltage incoming lines may each enter the outer shell 41 through a bushing and be electrically connected to the corresponding single-phase reactor. The three-phase low-voltage incoming lines may each enter the outer shell 41 through a bushing and be electrically connected to the first output end of the inverter submodule 132 in the low-voltage output module 13 of the corresponding single-phase power unit group. The bushing may be provided on a side adjacent to the heat exchanger 46 or on a side away from the heat exchanger 46, which is not limited here. The plurality of bushings may be provided at the same horizontal height or may be provided in a dispersed manner, which is not limited here. For example, Fig.10 As shown, the outer shell 41 is provided with bushings S1, S2, S3, S4, S5 and S6, and the bushings S1 to S6 can be arranged on a side adjacent to the heat exchanger 46. Among them, the first-phase high-voltage incoming line can enter the outer shell 41 through the bushing S1 and be electrically connected to the first-phase reactor L1, and the first-phase reactor L1 is connected to the first-phase power unit group 451, and the first-phase low-voltage incoming line can enter the outer shell 41 through the bushing S4 and be connected to the first-phase power unit group 451. The second-phase high-voltage incoming line can enter the outer shell 41 through the bushing S2 and be electrically connected to the second-phase reactor L2, and the second-phase reactor L2 is connected to the second-phase power unit group 452, and the second-phase low-voltage incoming line can enter the outer shell 41 through the bushing S5 and be connected to the second-phase power unit group 452. The third-phase high-voltage incoming line can enter the outer shell 41 through the bushing S3 and be electrically connected to the third-phase inductor L3. The third-phase inductor L3 is connected to the third-phase power unit group 453. The third-phase low-voltage incoming line can enter the outer shell 41 through the bushing S6 and be connected to the third-phase power unit group 453.

[0097] Fig.12 A schematic structural diagram of an example of a three-phase power unit group and a water cooling part provided in an embodiment of the present application. Fig.13 for Fig.12 The schematic diagram of the structure of the three-phase power unit group and the water cooling part is shown in another angle. Fig.12 and Fig.13 As shown, the solid-state transformer may include three-phase power unit groups 451, 452 and 453. Each phase power unit group includes N solid-state transformer power units in the above embodiment, where N is an integer greater than or equal to 2. The three-phase power unit group is arranged on the support structure 42, and the three-phase reactor may also be arranged on the support structure 42.

[0098] Specifically, the three-phase power unit group and the three-phase reactor can be arranged in two columns. One column includes the first-phase power unit group 451 and the second-phase power unit group 452, and the first-phase power unit group 451 and the second-phase power unit group 452 are arranged in sequence. The other column includes the third-phase power unit group 453 and the three-phase reactor, and the three-phase reactor and the third-phase power unit group 453 are arranged in sequence. The third-phase power unit group 453 is arranged side by side with the second-phase power unit group 452, and the three-phase reactor is arranged side by side with the first-phase power unit group 451. The three-phase reactor may specifically include a first-phase reactor L1, a second-phase reactor L2, and a third-phase reactor L3. The side-by-side arrangement between the first-phase power unit group 451, the second-phase power unit group 452, the third-phase power unit group 453 and the three-phase reactor can improve the integration of the three-phase power unit group and the three-phase reactor.

[0099] In some examples, the solid-state transformer substation further has a first main water outlet pipe 471 and a first main water inlet pipe. The first main water outlet pipe 471 and the first main water inlet pipe are arranged adjacent to the three-phase power unit group to dissipate heat for the three-phase power unit group. The first main water outlet pipe 471 and the first main water inlet pipe are connected to the water cooling cabinet 43. Fig.12 and Fig.13 As shown, in the installed state, the first main water outlet pipe 471 is located above the high voltage input module 11 in the solid-state transformer power unit and is arranged around the three-phase power unit group. The first main water outlet pipe 471 is provided with a first branch water outlet corresponding to each high voltage input module 11. The first main water inlet pipe is located below the low voltage output module 13 in the solid-state transformer power unit and is arranged around the three-phase power unit group. The first main inlet and outlet pipe is provided with a first branch water inlet corresponding to each high voltage input module 11.

[0100] Fig.14 This is a partial schematic diagram of an example of a water cooling part and a solid-state transformer power unit provided in an embodiment of the present application. Fig.14As shown, the solid-state transformer power unit 10 is installed vertically on the supporting structure 42, the high-voltage input module 11 is installed on the upper layer, the low-voltage output module 13 is installed on the lower layer, and the intermediate isolation module 12 is located between the high-voltage input module 11 and the low-voltage output module 13. The water outlet 218 of the water-cooled plate 216 in each high-voltage input module 11 is connected to the corresponding first branch water outlet through the second connecting water pipe 481. The water inlet of the water-cooled plate in each low-voltage output module 13 is connected to the corresponding first branch water inlet through the third connecting water pipe 482. In the same solid-state transformer power unit 10, the water inlet 217 of the water-cooled plate 216 of the high-voltage input module 11 is connected to the water outlet of the water-cooled plate of the low-voltage output module 13 through the first connecting water pipe 15.

[0101] The water cooling cabinet 43 transmits the coolant to each low-voltage output module 13 in the three-phase power unit group through the first main water inlet pipe 472 and the third connecting water pipe 482. The coolant takes away the heat generated by each low-voltage output module 13 and enters each high-voltage input module 11 in the three-phase power unit group through the first connecting water pipe 15. The coolant takes away the heat generated by each high-voltage input module 11, and the coolant with heat flows into the water cooling cabinet 43 through the second connecting water pipe 481 and the first main water outlet pipe 471. The water cooling cabinet 43 includes a circulation system, which can transmit the coolant with heat to the heat exchanger 46 through the heat exchange water inlet pipe 461. The heat exchanger 46 cools the coolant with heat generated by the three-phase power unit group, and transmits the cooled coolant to the water cooling cabinet 43 through the heat exchange water outlet pipe 462. The water cooling cabinet 43 then transmits the cooled coolant to each low-voltage output module 13 in the three-phase power unit group through the first main water inlet pipe 472 and the third connecting water pipe 482 for the next cooling cycle.

[0102] In the above embodiment, the first main water inlet pipe 472 surrounds the three-phase power unit group and can be set as a U-shaped pipe. The first main water outlet pipe 471 surrounds the three-phase power unit group and can be set as a U-shaped pipe. The first main water inlet pipe 472 and the first main water outlet pipe 471 of the U-shaped pipe can evenly dissipate heat for each solid-state transformer power unit 10 in the three-phase power unit group. The flow path of the coolant in the heat dissipation system is compact, which also improves the integration of the solid-state transformer substation design.

[0103] Fig.15 The following is a schematic diagram of an example of the connection of a solid-state transformer power unit in a three-phase power unit group provided in an embodiment of the present application. Fig.15As shown, in each phase power unit group, the first input end 212 of the rectifier module 111 in the first high-voltage input module 11 is electrically connected to the corresponding one-phase reactor. The first input end 212 of the rectifier module 111 in the i-th high-voltage input module 11 and the second input end 213 of the rectifier module 111 in the i-1-th high-voltage input module 11 can be electrically connected through the first connecting bar 491, 1<i≤N. The first output end of the inverter module 132 in each low-voltage output module 13 can be electrically connected through the second connecting bar 492, and the second connecting bar 492 is configured to be electrically connected to the corresponding one-phase low-voltage incoming line.

[0104] The second input end 213 of the rectifier module 111 in the Nth high-voltage input module 11 of the three-phase power unit group is electrically connected through the third connecting bar 493. The third connecting bar 493 is not grounded and is suspended. The second output end of the inverter module 132 in each low-voltage output module 13 of the three-phase power unit group is electrically connected through the fourth connecting bar 494. The fourth connecting bar 494 is grounded.

[0105] Specifically, the first input end 212 of the rectifier module 111 in the first high-voltage input module 11 of the first-phase power unit group 451 is electrically connected to the first-phase reactor L1. The first input end 212 of the rectifier module 111 in the i-th high-voltage input module 11 of the first-phase power unit group 451 and the second input end 213 of the rectifier module 111 in the i-1-th high-voltage input module 11 can be electrically connected through the first connecting bar 491. The first output end of the inverter module 132 in each low-voltage output module 13 of the first-phase power unit group 451 can be electrically connected through the second connecting bar 492, and the second connecting bar 492 is configured to be electrically connected to the first-phase low-voltage incoming line.

[0106] The first input end 212 of the rectifier module 111 in the first high-voltage input module 11 of the second-phase power unit group 452 is electrically connected to the second-phase reactor L2. The first input end 212 of the rectifier module 111 in the i-th high-voltage input module 11 of the second-phase power unit group 452 and the second input end 213 of the rectifier module 111 in the i-1-th high-voltage input module 11 can be electrically connected through the first connecting bar 491. The first output end of the inverter module 132 in each low-voltage output module 13 of the second-phase power unit group 452 can be electrically connected through the second connecting bar 492, and the second connecting bar 492 is configured to be electrically connected to the second-phase low-voltage incoming line.

[0107] The first input end 212 of the rectifier module 111 in the first high-voltage input module 11 of the third-phase power unit group 453 is electrically connected to the third-phase reactor L3. The first input end 212 of the rectifier module 111 in the i-th high-voltage input module 11 of the third-phase power unit group 453 and the second input end 213 of the rectifier module 111 in the i-1-th high-voltage input module 11 can be electrically connected through the first connecting bar 491. The first output end of the inverter module 132 in each low-voltage output module 13 of the third-phase power unit group 453 can be electrically connected through the second connecting bar 492, and the second connecting bar 492 is configured to be electrically connected to the third-phase low-voltage incoming line.

[0108] The second input end 213 of the rectifier module 111 in the Nth high-voltage input module 11 of the first-phase power unit group 451, the second input end 213 of the rectifier module 111 in the Nth high-voltage input module 11 of the second-phase power unit group 452, and the second input end 213 of the rectifier module 111 in the Nth high-voltage input module 11 of the third-phase power unit group 453 are electrically connected through the third connecting row 493. The third connecting row 493 is not grounded and is suspended. The second output end of the inverter module 132 in each low-voltage output module 13 in the first-phase power unit group 451, the second-phase power unit group 452, and the third-phase power unit group 453 is electrically connected through the fourth connecting row 494. The fourth connecting row 494 is grounded.

[0109] The number of connection rows in the above embodiments can be set according to the working scenario and working requirements, and is not limited here.

[0110] The support structure 42 for supporting the three-phase power unit group may include an upper support 423 and a lower support 422. The high voltage input module 11 in the solid-state transformer power unit is arranged on the upper support 423, and the intermediate isolation module 12 and the low voltage output module 13 in the solid-state transformer power unit are arranged on the lower support 422. The support structure 42 may also include a support base 421, and the support base 421 may support the lower support 422.

[0111] Fig.16 A schematic structural diagram of an example of a support structure provided in an embodiment of the present application. Fig.16 The support structure 42 shown may be suitable for Fig.11 , Fig.12 , Fig.13 and Fig.15 The three-phase power unit group is shown in FIG.

[0112] like Fig.16As shown, in the installed state, a lower support 422 is provided on the support base 421, and an upper support 423 is provided above the lower support 422. The lower support 422 can be specifically divided into four support areas. The four support areas are divided into two columns along the column direction and two rows along the row direction. Among them, the lower supports 422 in the three support areas are respectively used to support the low-voltage output modules 13 in the corresponding one-phase power unit group, and the lower support 422 in the remaining support area can be used to support the three-phase reactors L1, L2 and L3. The upper support 423 can be specifically divided into three support areas, and the three support areas of the upper layer correspond one-to-one to the three support areas of the lower layer for supporting the low-voltage output module 13, and the upper support 423 of the three support areas of the upper layer are respectively used to support the high-voltage input module 11 in the corresponding one-phase power unit group. The upper support 423 may not be provided above the support area where the lower support 422 of the lower layer for supporting the three-phase reactors L1, L2 and L3 is located.

[0113] The upper support 423 may be an insulating support to achieve high voltage safety isolation. The lower support 422 may be an insulating support or a metal support, which is not limited here. In order to ensure safety isolation, the vertical supports in the upper support 423 and the lower support 422 may be insulating supports. The support base 421 may include but is not limited to a stainless steel base.

[0114] The components of the solid-state transformer substation may be arranged in other ways, which are not limited here. Fig.17 This is a schematic structural diagram of another embodiment of a solid-state transformer substation provided by the present application. Fig.18 for Fig.17 The cross-sectional structure diagram of the solid-state transformer substation is shown in FIG. Fig.17 and Fig.18 As shown, the solid-state transformer substation may include an outer shell 41, a support structure 42 disposed inside the outer shell 41, a three-phase reactor, a water cooling cabinet 43, a control cabinet 44, a three-phase power unit group disposed on the support structure 42, and a heat exchanger 46 disposed outside the outer shell 41 and connected to the water cooling cabinet 43 through a heat exchange water inlet pipe 461 and a heat exchange water outlet pipe 462. Fig.17 As shown, the sleeves S1 to S6 provided on the outer shell 41 can be provided on a side away from the heat exchanger 46. The three-phase power unit group includes a first-phase power unit group, a second-phase power unit group and a third-phase power unit group. The three-phase reactor, the first-phase power unit group, the second-phase power unit group and the third-phase power unit group are arranged in sequence. The solid-state transformer power units in each phase power unit group are arranged in two columns.

[0115] Fig.19 This is a schematic diagram of another example of the structure of the three-phase power unit group and the water cooling part provided in the embodiment of the present application. Fig.19As shown, each phase power unit group includes N solid-state transformer power units in the above-mentioned embodiment. The three-phase power unit group is arranged on the supporting structure 42. In this example, the three-phase reactor is not arranged on the supporting structure 42.

[0116] Specifically, the solid-state transformer power units in each phase power unit group are arranged in two columns. For example, the solid-state transformer power units in the first phase power unit group 451 are arranged in two columns, the solid-state transformer power units in the second phase power unit group 452 are arranged in two columns, and the solid-state transformer power units in the third phase power unit group 453 are arranged in two columns. The first column of solid-state transformer power units in the first phase power unit group 451, the first column of solid-state transformer power units in the second phase power unit group 452, and the first column of solid-state transformer power units in the third phase power unit group 453 can be located in the same column. The second column of solid-state transformer power units in the first phase power unit group 451, the second column of solid-state transformer power units in the second phase power unit group 452, and the second column of solid-state transformer power units in the third phase power unit group 453 can be located in the same column. The three-phase power unit groups are arranged in sequence, and the solid-state transformer power units in each phase power unit group are arranged in two columns, which can improve the integration of the three-phase power unit group.

[0117] In some examples, the solid-state transformer substation further has a second main water outlet pipe 473, a third main water outlet pipe 474, a second main water inlet pipe 475, and a third main water inlet pipe 476. The second main water outlet pipe 473, the third main water outlet pipe 474, the second main water inlet pipe 475, and the third main water inlet pipe 476 are arranged adjacent to the three-phase power unit group to dissipate heat for the three-phase power unit group. The second main water outlet pipe 473, the third main water outlet pipe 474, the second main water inlet pipe 475, and the third main water inlet pipe 476 are connected to the water cooling cabinet 43. Fig.19 As shown, the second main water outlet pipe 473 is located above a row of high-pressure input modules 11. The second main water outlet pipe 473 is provided with a second branch water outlet corresponding to a row of high-pressure input modules 11. The third main water outlet pipe 474 is located above another row of high-pressure input modules 11. The third main water outlet pipe 474 is provided with a third branch water outlet corresponding to another row of high-pressure input modules 11. The second main water inlet pipe 475 is located below a row of low-pressure output modules 13. The second main water inlet pipe 475 is provided with a second branch water inlet corresponding to a row of low-pressure output modules 13. The third main water inlet pipe 476 is located below another row of low-pressure output modules 13. The third main water inlet pipe 476 is provided with a third branch water inlet corresponding to another row of low-pressure output modules 13.

[0118] Fig. 20 A partial schematic diagram of another example of a partial water cooling portion and a solid-state transformer power unit provided in an embodiment of the present application. Fig. 20FIG. 1 shows a part of a row of high voltage input modules 11 and a row of low voltage output modules 13. Fig. 20 As shown, the solid-state transformer power unit is installed vertically on the supporting structure 42, the high-voltage input module 11 is installed on the upper layer, the low-voltage output module 13 is installed on the lower layer, and the intermediate isolation module 12 is located between the high-voltage input module 11 and the low-voltage output module 13. The water outlet 218 of the water-cooled plate 216 in a row of high-voltage input modules 11 is connected to the corresponding second branch water outlet through the fourth connecting water pipe 483. The water inlet of the water-cooled plate in a row of low-voltage output modules 13 is connected to the corresponding second branch water inlet through the fifth connecting water pipe 484. Fig. 20 On the other side not shown, the water outlet 218 of the water cooling plate 216 in another row of high-voltage input modules 11 is connected to the corresponding third branch water outlet through the sixth connecting water pipe. The water inlet of the water cooling plate in another row of low-voltage output modules 13 is connected to the corresponding third branch water inlet through the seventh connecting water pipe. In the same solid-state transformer power unit, the water inlet 217 of the water cooling plate 216 of the high-voltage input module 11 is connected to the water outlet of the water cooling plate of the low-voltage output module 13 through the first connecting water pipe 15.

[0119] The water cooling cabinet 43 transmits the coolant to a row of low-pressure output modules 13 through the second main water inlet pipe and the fifth connecting water pipe 484. The coolant takes away the heat generated by the row of low-pressure output modules 13 and enters a row of high-pressure input modules 11 through the first connecting water pipe 15. The coolant takes away the heat generated by the row of high-pressure input modules 11. The coolant with heat flows into the water cooling cabinet 43 through the fourth connecting water pipe 483 and the second main water outlet pipe 473. The water cooling cabinet 43 includes a circulation system, which can transmit the coolant with heat to the heat exchanger 46 through the heat exchange water inlet pipe 461. The heat exchanger 46 cools the coolant with heat and transmits the cooled coolant to the water cooling cabinet 43 through the heat exchange water outlet pipe 462. The water cooling cabinet 43 then transmits the cooled coolant to the row of low-pressure output modules 13 through the second main water inlet pipe and the fifth connecting water pipe 484 to perform the next cooling cycle.

[0120] The water cooling cabinet 43 also transmits the coolant to another row of low-pressure output modules 13 through the third main water inlet pipe and the seventh connecting water pipe. The coolant takes away the heat generated by the other row of low-pressure output modules 13 and enters another row of high-pressure input modules 11 through the first connecting water pipe 15. The coolant takes away the heat generated by the other row of high-pressure input modules 11. The coolant with heat flows into the water cooling cabinet 43 through the sixth connecting water pipe and the third main water outlet pipe 474. The water cooling cabinet 43 includes a circulation system, which can transmit the coolant with heat to the heat exchanger 46 through the heat exchange water inlet pipe 461. The heat exchanger 46 cools the coolant with heat and transmits the cooled coolant to the water cooling cabinet 43 through the heat exchange water outlet pipe 462. The water cooling cabinet 43 then transmits the cooled coolant to another row of low-pressure output modules 13 through the third main water inlet pipe and the seventh connecting water pipe for the next cooling cycle.

[0121] Fig.21 A schematic diagram of another example of connection of a solid-state transformer power unit in a three-phase power unit group provided in an embodiment of the present application. Fig. 22 for Fig.21 The schematic diagram of the connection of the solid-state transformer in one phase power unit group in the three-phase power unit group is shown in FIG. Fig.21 and Fig. 22 As shown, in each phase power unit group, the first input terminal 212 of the rectifier module 111 in the first high-voltage input module 11 is electrically connected to the corresponding one-phase reactor. The first input terminal 212 of the rectifier module 111 in the j-th high-voltage input module 11 is electrically connected to the second input terminal 213 of the rectifier module 111 in the j-1-th high-voltage input module 11 through the fifth connecting bar 495, 1<j≤N. The shape of the fifth connecting bar 495 can be a straight line or a U-shape, which is not limited here. The first output terminal of the inverter module 132 in each low-voltage output module 13 is electrically connected through the sixth connecting bar 496, and the sixth connecting bar 496 is electrically connected to the corresponding one-phase low-voltage incoming line.

[0122] The second input end 213 of the rectifier module 111 in the Nth high-voltage input module 11 of the three-phase power unit group is electrically connected through the seventh connecting bar 497 (not shown in the figure). The second output end of the inverter module 132 in each low-voltage output module 13 of the three-phase power unit group is electrically connected through the eighth connecting bar 498. The eighth connecting bar 498 is grounded.

[0123] The first input end 212 of the rectifier module 111 in the Nth high-voltage input module 11 of the first-phase power unit group 451 is electrically connected to the first input end 212 of the rectifier module 111 in the first high-voltage input module 11 of the second-phase power unit group 452 (not shown in the figure). The first input end 212 of the rectifier module 111 in the Nth high-voltage input module 11 of the second-phase power unit group 452 is electrically connected to the first input end 212 of the rectifier module 111 in the first high-voltage input module 11 of the third-phase power unit group 453 (not shown in the figure). The first input end 212 of the rectifier module 111 in the Nth high-voltage input module 11 of the third-phase power unit group 453 is electrically connected to the first input end 212 of the rectifier module 111 in the first high-voltage input module 11 of the first-phase power unit group 451 (not shown in the figure).

[0124] The number of connection rows in the above embodiments can be set according to the working scenario and working requirements, and is not limited here.

[0125] Fig.23 A schematic structural diagram of another example of a support structure provided in an embodiment of the present application. Fig.23 The support structure 42 shown may be suitable for Fig.18 , Fig.19 and Fig.21 The three-phase power unit group is shown in FIG.

[0126] like Fig.23 As shown, in the installed state, a lower support 422 is provided on the support base 421, and an upper support 423 is provided above the lower support 422. The lower support 422 and the upper support 423 can be specifically divided into three support areas. The lower support 422 in each support area is used to support the low-voltage output module 13 in the corresponding one-phase power unit group. The upper support 423 in each support area is used to support the high-voltage input module 11 in the corresponding one-phase power unit group. The upper support 423 can be specifically further divided into six support sub-areas, and the lower support 422 can be specifically further divided into six support sub-areas. The six support sub-areas of the upper layer correspond to the six support sub-areas of the lower layer one by one. The upper support 423 of a support sub-area of ​​the upper layer can be used to support a column of high-voltage input modules 11 in the corresponding one-phase power unit group. The lower support 422 of a support sub-area of ​​the lower layer can be used to support a column of low-voltage output modules 13 in the corresponding one-phase power unit group.

[0127] The upper support 423 may be an insulating support to achieve high voltage safety isolation. The lower support 422 may be an insulating support or a metal support, which is not limited here. In order to ensure safety isolation, the vertical supports in the upper support 423 and the lower support 422 may be insulating supports. The support base 421 may include but is not limited to a stainless steel base.

[0128] In the above embodiment, the communication port in the high voltage input module 11 in each phase power unit group is connected to the control cabinet 44 through a first communication link, and the communication port in the low voltage output module 13 in each phase power unit group is connected to the control cabinet 44 through a second communication link. For example, the communication port includes a fiber optic transceiver. Fig.24 This is a schematic diagram of an example of a fiber optic communication link between a fiber optic transceiver and a control cabinet provided in an embodiment of the present application. Fig.24 As shown, the optical fiber transceiver of the high voltage input module 11 of each solid-state transformer power unit 10 in the first phase power unit group 451, the optical fiber transceiver of the high voltage input module 11 of each solid-state transformer power unit 10 in the second phase power unit group 453, and the optical fiber transceiver of the high voltage input module 11 of each solid-state transformer power unit 10 in the third phase power unit group 453 are connected to the control cabinet 44 through the first optical fiber communication link 511. The optical fiber transceiver of the low voltage output module 13 of each solid-state transformer power unit 10 in the first phase power unit group 451, the optical fiber transceiver of the low voltage output module 13 of each solid-state transformer power unit 10 in the second phase power unit group 452, and the optical fiber transceiver of the low voltage output module 13 of each solid-state transformer power unit 10 in the third phase power unit group 453 are connected to the control cabinet 44 through the second optical fiber communication link 512. Information interaction with the control cabinet 44 is realized through the communication port.

[0129] In the embodiment of the present application, the three-phase reactor is integrated into the interior of the solid-state transformer substation through the integrated prefabricated design of the solid-state transformer substation, which reduces the design difficulty of the power cabinet, shortens the R&D and production time, and solves the problems of difficulty in connecting to the reactor and the large area occupied by the substation.

[0130] In the use environment of microgrid, there is no need to build a special installation room, which can shorten the construction period of microgrid, reduce the cost of microgrid construction and improve economy.

[0131] It should be clear that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the solid-state transformer substation embodiment, the relevant parts can refer to the description part of the solid-state transformer power unit embodiment. The present application is not limited to the specific structure described above and shown in the figures. Those skilled in the art can make various changes, modifications and additions after understanding the spirit of the present application. In addition, for the sake of brevity, a detailed description of the known technology is omitted here.

[0132] Those skilled in the art should understand that the above embodiments are exemplary rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on the study of the drawings, the specification and the claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other devices or steps; the quantifier "one" does not exclude multiple; the terms "first" and "second" are used to indicate names rather than to indicate any specific order. Any figure marks in the claims should not be understood as limiting the scope of protection. The functions of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A solid-state transformer power unit, characterized in that: It includes a separately packaged high voltage input module, an intermediate isolation module and a low voltage output module; The high-voltage input module includes a first shell, and a rectifier module, an inverter module and a DC support capacitor group connected in parallel in the first shell; the first input end and the second input end of the rectifier module extend from the first shell, and the first output end and the second output end of the inverter module extend from the first shell; The low voltage output module has the same structure as the high voltage input module; The intermediate isolation module is located between the high voltage input module and the low voltage output module, and includes a second housing and a high frequency transformer located in the second housing; a first input terminal, a second input terminal, a first output terminal and a second output terminal of the high frequency transformer extend from the second housing; The first input terminal and the second input terminal of the high-frequency transformer are electrically connected to the first output terminal and the second output terminal of the inverter submodule in the high-voltage input module respectively; The first output terminal and the second output terminal of the high-frequency transformer are electrically connected to the first input terminal and the second input terminal of the rectifier module in the low-voltage output module respectively; Among them, in the installed state, the solid-state transformer power unit is vertically installed in three layers, the high-voltage input module is installed on the upper layer, the low-voltage output module is installed on the bottom layer, and the intermediate isolation module is installed on the middle layer. The connection between the high-voltage input module, the intermediate isolation module, and the low-voltage output module is a detachable connection.

2. The solid-state transformer power unit according to claim 1, characterized in that: The high-voltage input module further includes a water cooling structure located within the first housing; The water cooling structure comprises a water cooling plate, the water cooling plate has a water inlet and a water outlet, the water inlet and the water outlet extend out of the first shell, the rectifier module and the inverter module are arranged on one side of the water cooling plate, and the DC support capacitor group is located on the other side of the water cooling plate; The water inlet of the water cooling plate in the high-pressure input module is connected to the water outlet of the water cooling plate in the low-pressure output module through a first connecting water pipe; The high-voltage input module also includes a laminated busbar located in the first shell, the laminated busbar is connected to the DC support capacitor group, the laminated busbar is also connected to the rectifier module and the inverter module, and the laminated busbar is perpendicular to the plane formed by the rectifier module and the inverter module.

3. The solid-state transformer power unit according to claim 2, characterized in that: The rectifier module includes two half-bridge IGBT device groups, and the inverter module includes two of the half-bridge IGBT device groups; The high-voltage input module further includes a drive control circuit board group arranged on the side of the rectifier module and the inverter module facing away from the water cooling plate; Along the direction of the rectifier module and the inverter module facing away from the water cooling plate, the drive control circuit board group includes a first drive circuit board, a second drive circuit board and a control circuit board which are stacked; The first driving circuit board comprises first circuits corresponding to the half-bridge IGBT device groups, and each of the first circuits is electrically connected to two first wiring terminals on the first driving circuit board; The second driving circuit board comprises isolation drivers corresponding to the half-bridge IGBT device groups, each of the isolation drivers is electrically connected to two second wiring terminals and one third wiring terminal on the second driving circuit board, and is electrically connected to the first wiring terminal and the second wiring terminal corresponding to the same half-bridge IGBT device group; The control circuit board comprises a control circuit, four fourth wiring terminals electrically connected to the control circuit, and a communication port connected to the control circuit, the fourth wiring terminals are electrically connected to the third wiring terminals in a one-to-one correspondence, and the first housing is provided with an opening corresponding to the communication port; The high-voltage input module also includes a power supply, which is disposed adjacent to the drive control circuit board group and is electrically connected to the laminated busbar and the control circuit board, respectively.

4. The solid-state transformer power unit according to claim 1, characterized in that: The first input end and the second input end of the high-frequency transformer are provided with isolation sheds.

5. A solid-state transformer substation, characterized in that: It includes an outer shell, a supporting structure arranged inside the outer shell, a three-phase reactor, a water cooling cabinet, a control cabinet, a three-phase power unit group arranged on the supporting structure, and a heat exchanger arranged outside the outer shell and connected to the water cooling cabinet through a heat exchange water inlet pipe and a heat exchange water outlet pipe; Each phase power unit group includes N solid-state transformer power units as described in any one of claims 1 to 4, where N is an integer greater than or equal to 2.

6. The solid-state transformer substation according to claim 5, characterized in that: The first phase power unit group and the second phase power unit group are arranged in sequence, the third phase power unit group and the second phase power unit group are arranged side by side, and the three-phase reactor and the first phase power unit group are arranged side by side; In each phase power unit group, the first input end of the rectifier module in the first high-voltage input module is electrically connected to the corresponding one-phase reactor, the first input end of the rectifier module in the i-th high-voltage input module is electrically connected to the second input end of the rectifier module in the i-1-th high-voltage input module through a first connecting bar, 1<i≤N, the first output end of the inverter module in each low-voltage output module is electrically connected through a second connecting bar, and the second connecting bar is configured to be electrically connected to the corresponding one-phase low-voltage incoming line; The second input end of the rectifier module in the Nth high-voltage input module of the three-phase power unit group is electrically connected through a third connecting bar, and the second output end of the inverter module in each low-voltage output module of the three-phase power unit group is electrically connected through a fourth connecting bar, and the fourth connecting bar is grounded.

7. The solid-state transformer substation according to claim 5, characterized in that: The three-phase reactor, the first-phase power unit group, the second-phase power unit group, and the third-phase power unit group are arranged in sequence; the solid-state transformer power units in each phase power unit group are arranged in two columns; In each phase power unit group, the first input end of the rectifier module in the first high-voltage input module is electrically connected to the corresponding one-phase reactor, the first input end of the rectifier module in the j-th high-voltage input module is electrically connected to the second input end of the rectifier module in the j-1-th high-voltage input module through a fifth connecting bar, 1<j≤N, the first output end of the inverter module in each low-voltage output module is electrically connected through a sixth connecting bar, and the sixth connecting bar is electrically connected to the corresponding one-phase low-voltage incoming line; The second input end of the rectifier module in the Nth high-voltage input module of the three-phase power unit group is electrically connected through the seventh connecting bar, and the second output end of the inverter module in each low-voltage output module of the three-phase power unit group is electrically connected through the eighth connecting bar, and the eighth connecting bar is grounded; The first input end of the rectifier module in the Nth high-voltage input module of the first-phase power unit group is connected to the first input end of the rectifier module in the first high-voltage input module of the second-phase power unit group; the first input end of the rectifier module in the Nth high-voltage input module of the second-phase power unit group is connected to the first input end of the rectifier module in the first high-voltage input module of the third-phase power unit group; The first input end of the rectifier module in the Nth high-voltage input module of the third-phase power unit group is connected to the first input end of the rectifier module in the first high-voltage input module of the first-phase power unit group.

8. The solid-state transformer substation according to claim 6 or 7, characterized in that: The solid-state transformer substation also has a first main water outlet pipe located above each of the high-voltage input modules and arranged around the three-phase power unit group, and a first main water inlet pipe located below each of the low-voltage output modules and arranged around each of the three-phase power unit groups. The first main water outlet pipe and the first main water inlet pipe lead into the water cooling cabinet. The first main water outlet pipe is provided with a first branch water outlet corresponding to each of the high-voltage input modules one by one. The water outlet of the water-cooled plate in each of the high-voltage input modules is communicated with the corresponding first branch water outlet through a second connecting water pipe. The first main water inlet pipe is provided with a first branch water inlet corresponding to each of the low-voltage output modules one by one. The water inlet of the water-cooled plate in each of the low-voltage output modules is communicated with the corresponding first branch water inlet through a third connecting water pipe. or, The solid-state transformer substation also has a second main water outlet pipe arranged above a row of the high-voltage input modules, a third main water outlet pipe arranged above another row of the high-voltage input modules, a second main water inlet pipe arranged below a row of the low-voltage output modules, and a third main water inlet pipe arranged below another row of the low-voltage output modules. The second main water outlet pipe, the second main water inlet pipe, the third main water outlet pipe, and the third main water inlet pipe lead into the water cooling cabinet. The second main water outlet pipe is provided with second branch water outlets corresponding to the row of the high-voltage input modules one by one. The water outlets of the water cooling plates in the row of the high-voltage input modules are connected to the corresponding second branch water outlets through fourth connecting water pipes. The second main water inlet pipe is provided with a second branch water inlet corresponding one-to-one to a column of the low-pressure output modules, and the water inlet of the water cooling plate in a column of the low-pressure output modules is connected to the corresponding second branch water inlet through a fifth connecting water pipe. The third main water outlet pipe is provided with a third branch water outlet corresponding one-to-one to another column of the high-pressure input modules, and the water outlet of the water cooling plate in a column of the high-pressure input modules is connected to the corresponding third branch water outlet through a sixth connecting water pipe. The third main water inlet pipe is provided with a third branch water inlet corresponding one-to-one to another column of the low-pressure output modules, and the water inlet of the water cooling plate in another column of the low-pressure output modules is connected to the corresponding third branch water inlet through a seventh connecting water pipe.

9. The solid-state transformer substation according to claim 5, characterized in that: The support structure comprises an upper support and a lower support, the high voltage input module in the solid-state transformer power unit is arranged on the upper support, and the intermediate isolation module and the low voltage output module in the solid-state transformer power unit are arranged on the lower support; The upper support is an insulating support; The support structure also includes a support base, and the support base supports the lower support.

10. The solid-state transformer substation according to claim 5, characterized in that: The outer shell is provided with a plurality of bushings passing through the outer shell, and each of the three-phase high-voltage incoming wires enters the outer shell through one of the bushings and is electrically connected to the corresponding one-phase reactor, and each of the three-phase low-voltage incoming wires enters the outer shell through one of the bushings and is electrically connected to the first output end of the inverter submodule in the low-voltage output module of the corresponding one-phase power unit group; The communication port in the high voltage input module in each phase power unit group is connected to the control cabinet via a first communication link, and the communication port in the low voltage output module in each phase power unit group is connected to the control cabinet via a second communication link.

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