Power conversion unit, power converter and power system

Abstract

The power conversion unit, the power converter and the power system provided by the present disclosure relate to the technical field of new energy. The power conversion unit comprises a plurality of modular components, the plurality of modular components are sequentially distributed, each modular component comprises a cabinet body, a functional module and a power interface group arranged in the cabinet body, each cabinet body is provided with a designated maintenance door at at least one end face, in the same cabinet body, the designated maintenance door is arranged corresponding to the power interface of the power interface group, each cabinet body is arranged with a designated maintenance door at at least one designated side of the power conversion unit, the positions of the power interface groups of the two adjacent modular components correspond to each other, and the plurality of power interfaces of the two corresponding power interface groups are connected through the conductive structure correspondingly. On the basis of ensuring the modularization of the power conversion unit, the convenience of connecting the modular components through the conductive structure is improved, and the disassembly and assembly efficiency between the modular components is improved.

Description

Technical Field

[0001] This disclosure relates to the field of new energy technology, and more specifically, to a power conversion unit, a power converter, and a power system. Background Technology

[0002] With the rapid development of new energy power generation, energy storage systems, and smart grids, power conversion units, as core power electronic devices for converting electrical energy into its form, are seeing increasingly widespread applications. To improve production efficiency, reduce transportation costs, and support rapid on-site deployment, power conversion units are evolving towards modularization. "Modularization" refers to dividing the complete power conversion function into multiple independently manufactureable, transportable, installable, and replaceable modular components. These components form a complete system through mechanical and electrical connections.

[0003] However, in current modular power conversion units, the power circuit connections between module components are usually located deep inside the cabinet. This results in extremely limited operating space when installing, maintaining, or replacing individual module components, requiring the disassembly of a large number of internal components to reach the connection points, leading to low efficiency in the disassembly and assembly of modular components. Utility Model Content

[0004] This disclosure aims to address, to some extent, the issue of how to improve the efficiency of disassembly and assembly between modular components of power conversion units in related technologies.

[0005] To address at least one aspect of the aforementioned problems, in a first aspect, this disclosure provides a power conversion unit comprising multiple modular components arranged sequentially. Each modular component includes a cabinet and functional modules and power interface groups disposed within the cabinet. Each cabinet has a designated maintenance door at at least one end face. Within the same cabinet, the designated maintenance door corresponds to a power interface of the power interface group. Each cabinet has a designated maintenance door located on at least one designated side of the power conversion unit. The positions of the power interface groups of two adjacent modular components correspond to each other, and the multiple power interfaces of two corresponding power interface groups are connected by a conductive structure.

[0006] In some embodiments, the plurality of modular components include a first modular component and a second modular component, wherein the power interface group of the first modular component is a first power interface group, and the power interface group of the second modular component is a second power interface group, and both the first power interface group and the second power interface group include a DC interface group and an AC interface group. All power interfaces of the same DC interface group are correspondingly provided with the same set maintenance door. The set maintenance door corresponding to the DC interface group of the first power interface group and the set maintenance door corresponding to the DC interface group of the second power interface group are located on the same set side of the power conversion unit. All power interfaces of the same AC interface group are correspondingly provided with the same set maintenance door. The set maintenance door corresponding to the AC interface group of the first power interface group and the set maintenance door corresponding to the AC interface group of the second power interface group are located on the same set side of the power conversion unit.

[0007] In some embodiments, the DC interface group and the AC interface group of the first power interface group are respectively configured with the same set maintenance door, and the DC interface group and the AC interface group of the second power interface group are respectively configured with the same set maintenance door.

[0008] In some embodiments, the designated maintenance door corresponding to the DC interface group of the first power interface group is a first door, and the designated maintenance door corresponding to the DC interface group of the second power interface group is a second door; the designated maintenance door corresponding to the AC interface group of the first power interface group is a third door, and the designated maintenance door corresponding to the AC interface group of the second power interface group is a fourth door. The first gate and the second gate are both located on the same set side of the power conversion unit; the third gate and the fourth gate are both located on another set side of the power conversion unit.

[0009] In some embodiments, the first door and the third door are arranged opposite each other, and the second door and the fourth door are arranged opposite each other.

[0010] In some embodiments, the functional modules of the second power interface group include a DC power distribution module and an AC power distribution module; the DC power distribution module is located near the second gate, and the AC power distribution module is located near the fourth gate.

[0011] In some embodiments, the direction in which the plurality of modular components are sequentially distributed is a first direction, and the designated access door is located in a second direction; The power interface has a conductive connection portion for detachable connection with the conductive structure. At least two power interfaces corresponding to the same set maintenance door are distributed sequentially in the second direction. In any two adjacent power interfaces in the second direction, the one farther from the set maintenance door is the inner interface, and the one closer to the set maintenance door is the outer interface. The projection of the conductive connection portion of the inner interface onto the set maintenance door in the second direction and the projection of the outer interface onto the set maintenance door in the second direction do not overlap. And / or, at least two of the power interfaces corresponding to the same set maintenance door are distributed sequentially in a third direction, and the third direction, the first direction, and the second direction are arranged in pairs.

[0012] In some embodiments, the first direction is the vertical direction, and the second direction is the horizontal direction, extending along the length or width of the bottom surface of the cabinet.

[0013] In some embodiments, both the first direction and the second direction are horizontal, the first direction extends along one of the length and width directions of the bottom surface of the cabinet, and the second direction extends along the other of the length and width directions of the bottom surface of the cabinet.

[0014] In some embodiments, the second direction extends along the width direction of the bottom surface of the cabinet, and all the power interfaces of the same modular component are correspondingly provided with the same set maintenance door, and are distributed sequentially in the third direction.

[0015] In some embodiments, a channel for the conductive structure to pass through is provided at the adjacent end faces of two adjacent cabinets.

[0016] In some embodiments, the conductive structure is a flexible connection structure.

[0017] In some embodiments, the functional modules of the first modular component include a power component of the inverter power module and a DC capacitor component of the inverter power module, and the functional modules of the second modular component include a DC power distribution module, an AC filter module, and an AC power distribution module; the DC power distribution module, the DC capacitor component, the power component, the AC filter module, and the AC power distribution module are electrically connected in sequence, wherein the DC power distribution module and the DC capacitor component are electrically connected through a DC interface group of the power interface group between the first modular component and the second modular component, and the output terminal of the power component and the AC filter module are electrically connected through an AC interface group of the power interface group between the first modular component and the second modular component.

[0018] In a second aspect, this disclosure provides a power converter including one or more power conversion units as described in any of the first aspects above.

[0019] In some embodiments, when there are multiple power conversion units, the length direction of the bottom surface of the cabinet of each power conversion unit is consistent, and the width direction of the bottom surface of the cabinet of each power conversion unit is consistent. The power conversion units are distributed sequentially along the length direction, or the power conversion units are distributed sequentially along the width direction.

[0020] In some embodiments, among all the power conversion units distributed sequentially in the same direction, at least one access door of each cabinet is located at a non-connected point of adjacent power conversion units.

[0021] Thirdly, this disclosure provides a power system including the power conversion unit as described in the first aspect above, or including the power converter as described in the second aspect above.

[0022] In the power conversion unit, power converter, and power system disclosed herein, multiple modular components are sequentially distributed. Each modular component's cabinet has a designated maintenance door at at least one end face. Within the same cabinet, the designated maintenance door corresponds to the power interface of the power interface group. Each cabinet has a designated maintenance door on at least one designated side of the power conversion unit, and the positions of the power interface groups used for power circuit connection between two adjacent modular components correspond to each other. Thus, after the designated maintenance door on the same designated side of the power conversion unit is opened, the disassembly and assembly operations between the conductive structure and the power interfaces at both ends can be performed. This disclosure, while ensuring the modularity and versatility of the power conversion unit, can improve the convenience of connecting modular components through conductive structures, improve the convenience of maintenance of the power conversion unit, and increase the disassembly and assembly efficiency of the modular components. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the power interface layout from one perspective of the power conversion unit in an embodiment of this disclosure. Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 A schematic diagram of the power interface layout from another perspective of the power conversion unit shown. Figure 4 This is a schematic diagram of the power interface layout of the power conversion unit from one perspective when the DC interface group and the AC interface group are respectively arranged at both ends of the cabinet in the second direction in an embodiment of this disclosure. Figure 5 for Figure 4 A schematic diagram of the power interface layout from another perspective of the power conversion unit shown. Figure 6 for Figure 4 The power interface layout diagram of the power conversion unit is shown from another perspective. Figure 7 This is a schematic diagram of the power interface layout from one perspective of the power conversion unit when all power interfaces are sequentially distributed in a third direction in the embodiments of this disclosure. Figure 8 This is a top view of an embodiment of the present disclosure showing the layout of the access door when four power conversion units are sequentially distributed along the length of the cabinet. Figure 9 This is a top view of a cabinet layout where four power conversion units are sequentially distributed along the length of the cabinet, according to another embodiment of the present disclosure. Figure 10 This is a top view of an embodiment of the present disclosure showing the layout of the access door when four power conversion units are sequentially distributed along the width of the cabinet. Figure 11 This is a top view of a layout for the access door when four power conversion units are sequentially distributed along the width of the cabinet, according to another embodiment of this disclosure. Figure 12 This is a top view of a cabinet layout with four power conversion units arranged sequentially along the width of the cabinet, as described in another embodiment of this disclosure. Figure 13 This is a three-dimensional structural diagram of the power conversion unit in an embodiment of the present invention when the left side is the set side; Figure 14 for Figure 13 A schematic diagram of the power conversion unit from another perspective is shown; Figure 15 for Figure 13 The embodiment shown is a three-dimensional structural diagram of a first AC power interface and a second AC power interface connected by a conductive structure. Figure 16 For four Figure 13 The diagram shows the power conversion units distributed sequentially along the width of the bottom surface of the cabinet.

[0024] Explanation of reference numerals in the attached figures: 1-Modular component; 1A-First modular component; 1B-Second modular component; 11-Cabinet; 11A-First cabinet; 11B-Second cabinet; 111-Access door; 111A-First door; 111B-Second door; 111C-Third door; 11D-Fourth door; 12-Functional module; 121-DC power distribution module; 122-Reactor; 123-AC power distribution module; 124-DC capacitor assembly; 13-Power interface Group; 13A - First power interface group; 13B - Second power interface group; 131 - DC interface group; 132 - AC interface group; 1301 - Power interface; 13011 - First DC power interface; 13012 - Second DC power interface; 13013 - First AC power interface; 13014 - Second AC power interface; 13010 - Conductive connection part; 2 - Conductive structure; U - First direction; V - Second direction; W - Third direction. Detailed Implementation

[0025] To make the above-described objects, features, and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. Although some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0026] Those skilled in the art should understand that, unless explicitly stated in the context, or if the context reveals that it has a clear limitation, the following should be understood: the term "comprising" and its variations as used herein are open-ended inclusion, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "some embodiments" means "optional embodiments"; the concepts of "first," "second," etc., are used only to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. A feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0027] Furthermore, the illustrative expressions of the terms used in this specification do not necessarily refer to the same embodiments or implementations. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0028] The positive direction of the X-axis (that is, the direction the arrow points on the X-axis) indicates the front side, and the negative direction of the X-axis indicates the rear side; in the attached figure, the Y-axis represents the horizontal direction and is specified as the left and right position, and the positive direction of the Y-axis (that is, the direction the arrow points on the Y-axis) indicates the right side, and the negative direction of the Y-axis indicates the left side; in the attached figure, the Z-axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the direction the arrow points on the Z-axis) indicates up, and the negative direction of the Z-axis indicates down; in the attached figure, the X-axis represents the front and back position. It should also be noted that the aforementioned representations of the X-axis, Y-axis and Z-axis are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0029] like Figure 1 As shown, an embodiment of this disclosure provides a power conversion unit, including multiple modular components 1, which are arranged sequentially. Each modular component 1 includes a cabinet 11 and a functional module 12 and a power interface group 13 disposed within the cabinet 11. Each cabinet 11 has a setting maintenance door 111 at at least one end face. In the same cabinet 11, the setting maintenance door 111 is correspondingly disposed with the power interface 1301 of the power interface group 13. Each cabinet 11 has a setting maintenance door 111 arranged on at least one setting side of the power conversion unit. The positions of the power interface groups 13 of two adjacent modular components 1 are corresponding, and the multiple power interfaces 1301 of the corresponding two power interface groups 13 are connected by a conductive structure 2.

[0030] Specifically, power conversion units are used to convert electrical energy into different forms, such as inverters, rectifiers, or bidirectional converters, and are widely used in photovoltaics, energy storage, wind power, and other fields. Their functions include DC to AC, AC to DC, or DC / AC voltage level conversion.

[0031] The power conversion unit divides the complete power conversion function into several independent modular components 1 according to physical or functional boundaries. Multiple modular components 1 are distributed sequentially in the first direction U. The cabinets 11 of adjacent modular components 1 are detachably connected. The positions of the power interface groups 13 for the main current transmission function of two adjacent modular components 1 are corresponding.

[0032] Functional module 12 is the basic "functional block" that constitutes the power conversion function of a complete power conversion unit. It is an integrated hardware unit used to undertake a specific power electronic function (such as inversion, filtering, power distribution, control, etc.). Each modular component 1 can have one or more functional modules 12, which is not a limitation and can be set according to actual needs. The following will take the power conversion unit as an inverter unit (DC to AC conversion) as an example for illustrative explanation.

[0033] Each cabinet 11 has an access door at one or more end faces. The access door corresponding to the power interface 1301 is a setting access door 111, and each cabinet 11 has a setting access door 111 on one or more setting sides of the power conversion unit. In some scenarios, the setting side of the power conversion unit is on the side facing the second direction V, for example... Figure 1 In this configuration, the power conversion unit has a setting side on one side of its bottom surface along the length direction (the negative Y-axis side in the diagram, i.e., the left side) as the bottom surface. Each cabinet 11 has a setting and maintenance door 111 on its left side. In some scenarios, multiple sides of the power conversion unit are designated as setting sides, such as... Figure 4 As shown, both the left and right sides of the power conversion unit are set sides.

[0034] The maintenance door 111 is configured to correspond with the power interface 1301 of the power interface group 13. For example, the power interface 1301 of the power interface group 13 is located in the operable area of ​​the maintenance door 111. The operable area can be understood as the internal space of the cabinet 11 that can be operated after the maintenance door 111 is opened. Specifically, the operable area can be the internal space of the cabinet 11 that can be directly operated after the maintenance door 111 is opened. In some scenarios, the operable area can also be the internal space that requires further operation to be exposed after the maintenance door 111 is opened. In some scenarios, after the maintenance door 111 is opened, there is a small window or door inside the cabinet 11 that needs to be opened further.

[0035] The power interface 1301 in this specification is used to realize power transfer between two adjacent modular components 1. Generally speaking, the number of power interfaces 1301 and the number of conductive structures 2 of different modular components 1 are consistent. One end of the conductive structure 2 is detachably connected to the power interface 1301 of the corresponding power interface group 13, and the other end of the conductive structure 2 is detachably connected to the power interface 1301 of another corresponding power interface group 13. This specification will use this as an example for the following explanation. However, it should be understood that in some scenarios, it is possible that one power interface 1301 of a power interface group 13 is connected to multiple power interfaces 1301 of another power interface group 13 through one or more conductive structures 2.

[0036] Thus, in the power conversion unit of this disclosure, multiple modular components 1 are distributed sequentially. Each modular component 1's cabinet 11 has a setting maintenance door 111 at at least one end face. In the same cabinet 11, the setting maintenance door 111 is correspondingly set with the power interface 1301 of the power interface group 13. Each cabinet 11 has a setting maintenance door 111 arranged on at least one setting side of the power conversion unit, and the positions of the power interface group 13 used for power circuit connection between two adjacent modular components 1 correspond to each other. Thus, after the setting maintenance door 111 on the same setting side of the power conversion unit is opened, the disassembly and assembly operations between the conductive structure 2 and the power interfaces 1301 at both ends can be performed. This disclosure, while ensuring the modularity and module universality of the power conversion unit, can improve the convenience of connecting the modular components 1 through the conductive structure 2, improve the convenience of maintenance of the power conversion unit, and improve the disassembly and assembly efficiency of the modular components 1.

[0037] like Figure 2 and Figure 3 As shown, in some embodiments, multiple modular components 1 include a first modular component 1A and a second modular component 1B. The power interface group 13 of the first modular component 1A is the first power interface group 13A, and the power interface group 13 of the second modular component 1B is the second power interface group 13B. Both the first power interface group 13A and the second power interface group 13B include a DC interface group 131 and an AC interface group 132. The cabinet 11 of the first modular component 1A is the first cabinet 11A, and the cabinet 11 of the second modular component 1B is the second cabinet 11B.

[0038] All power interfaces 1301 of the same DC interface group 131 are correspondingly configured with the same set maintenance door 111. The set maintenance door 111 corresponding to the DC interface group 131 of the first power interface group 13A and the set maintenance door 111 corresponding to the DC interface group 131 of the second power interface group 13B are located on the same setting side of the power conversion unit. All power interfaces 1301 of the same AC interface group 132 are correspondingly configured with the same set maintenance door 111. The set maintenance door 111 corresponding to the AC interface group 132 of the first power interface group 13A and the set maintenance door 111 corresponding to the AC interface group 132 of the second power interface group 13B are located on the same setting side of the power conversion unit.

[0039] like Figure 3As shown, specifically, all power interfaces 1301 of the same DC interface group 131 are arranged in the operable area of ​​the same maintenance door 111. The DC interface group 131 of the first power interface group 13A and the DC interface group 131 of the second power interface group 13B are used to realize DC power transmission between the first modular component 1A and the second modular component 1B. The DC interface group 131 of the first power interface group 13A includes two first DC power interfaces 13011, which are positive and negative interfaces respectively. The DC interface group 131 of the second power interface group 13B includes two second DC power interfaces 13012, which are positive and negative interfaces respectively.

[0040] All power interfaces 1301 of the same AC interface group 132 are arranged in the operable area of ​​the same maintenance door 111. The AC interface group 132 of the first power interface group 13A and the AC interface group 132 of the second power interface group 13B are used to realize the AC power transmission between the first modular component 1A and the second modular component 1B. The AC interface group 132 of the first power interface group 13A includes three first AC power interfaces 13013, which are three-phase interfaces. The AC interface group 132 of the second power interface group 13B includes three second AC power interfaces 13014, which are three-phase interfaces.

[0041] In this way, the DC power circuit (first DC power interface 13011, second DC power interface 13012 and corresponding conductive structure 2) between the first modular component 1A and the second modular component 1B can be connected on the same setting side of the power conversion unit, and the AC power circuit (first AC power interface 13013, second AC power interface 13014 and corresponding conductive structure 2) between the first modular component 1A and the second modular component 1B can be connected on the same setting side of the power conversion unit.

[0042] Here, the same setting side of the power conversion unit corresponding to the first DC power interface 13011 and the second DC power interface 13012, and the same setting side of the power conversion unit corresponding to the first AC power interface 13013 and the second AC power interface 13014, do not necessarily have a spatial relationship, which will be explained by example later.

[0043] It should be noted that, as Figures 1 to 7 In the accompanying drawings, the first DC power interface 13011 and the second DC power interface 13012 are both represented by a rectangular frame filled with a diagonal line pattern, the first AC power interface 13013 and the second AC power interface 13014 are both represented by a rectangular frame filled with a grid pattern, and the conductive structure 2 is represented by a rectangular frame filled with another diagonal line pattern.

[0044] like Figures 1 to 3As shown, the main reference is... Figure 2 and Figure 3 As shown, in some embodiments, the DC interface group 131 and AC interface group 132 of the first power interface group 13A are correspondingly arranged with the same designated maintenance door 111, and the DC interface group 131 and AC interface group 132 of the second power interface group 13B are correspondingly arranged with the same designated maintenance door 111. Specifically, the DC interface group 131 and AC interface group 132 of the first power interface group 13A are arranged in the operable area of ​​the same designated maintenance door 111, and the DC interface group 131 and AC interface group 132 of the second power interface group 13B are arranged in the operable area of ​​the same designated maintenance door 111.

[0045] like Figures 1 to 3 and Figure 13 As shown, exemplarily, both the first cabinet 11A and the second cabinet 11B have only one designated maintenance door 111. The designated maintenance door 111 of the first cabinet 11A is the first door 111A, and the designated maintenance door 111 of the second cabinet 11B is the second door 111B. Both the first door 111A and the second door 111B are located on the same designated side of the power conversion unit. Figure 1-3 In the illustrated scheme, the left side is defined. The DC interface group 131 and AC interface group 132 of the first power interface group 13A are arranged in the operable area of ​​the first door 111A. That is, all power interfaces 1301 of the first power interface group 13A are arranged in the operable area of ​​the first door 111A. The DC interface group 131 and AC interface group 132 of the second power interface group 13B are arranged in the operable area of ​​the second door 111B. That is, all power interfaces 1301 of the second power interface group 13B are arranged in the operable area of ​​the second door 111B.

[0046] For example, different from the above Figure 1-3 In the scheme shown, the side is defined as the left side. Figure 7 The side shown in the scheme can also be the front side or the rear side.

[0047] In this way, all the setting inspection doors 111 can be operated on the same setting side of the power conversion unit, thereby enabling the connection operation of all power interfaces 1301 with the corresponding conductive structure 2.

[0048] like Figures 4 to 6As shown, in some embodiments, the set maintenance door 111 corresponding to the DC interface group 131 of the first power interface group 13A is the first door 111A, and the set maintenance door 111 corresponding to the DC interface group 131 of the second power interface group 13B is the second door 111B; the set maintenance door 111 corresponding to the AC interface group 132 of the first power interface group 13A is the third door 111C, and the set maintenance door 111 corresponding to the AC interface group 132 of the second power interface group 13B is the fourth door 11D; the first door 111A and the second door 111B are both located on the same setting side of the power conversion unit; the third door 111C and the fourth door 11D are both located on the other setting side of the power conversion unit.

[0049] In other words, in this embodiment, the power conversion unit has two settings sides. An AC power circuit can be connected at one settings side, and a DC power circuit can be connected at the other settings side, which facilitates the separation design of AC and DC inside each cabinet 11 as needed.

[0050] Furthermore, the first door 111A and the third door 111C are arranged opposite each other, and the second door 111B and the fourth door 11D are arranged opposite each other. For example... Figures 4 to 6 As shown, all the access doors 111 are located in the second direction V, which corresponds to the length direction of the bottom surface of the cabinet 11. At this point, DC power circuits and AC power circuits can be connected to opposite sides of the power conversion unit.

[0051] like Figures 4 to 6 As shown, further, the functional module 12 of the second power interface group 13B includes a DC power distribution module 121 and an AC power distribution module 123; the DC power distribution module 121 is located near the second gate 111B, and the AC power distribution module 123 is located near the fourth gate 11D. Specifically, the end of the second DC power interface 13012 of the second power interface group 13B furthest from the corresponding conductive structure 2 is connected to the DC power distribution module 121, and the end of the second AC power interface 13014 of the second power interface group 13B furthest from the corresponding conductive structure 2 is connected to the AC power distribution module 123.

[0052] This facilitates the AC / DC functional zoning management of the power interface group 13, balances the convenience of connecting the conductive structure 2 with the safety of the AC / DC system, and also helps to reduce the distance between the power interface 1301 and the corresponding power distribution module, thereby reducing voltage loss.

[0053] like Figure 2 and Figure 15 As shown, in the above embodiment, the power interface 1301 has a conductive connection portion 13010 for detachable connection with the conductive structure 2.

[0054] Specifically, the conductive connection part 13010 is the part on the power interface 1301 used to achieve physical contact and current conduction with the conductive structure 2. The conductive connection part 13010 can be a threaded hole, terminal block, or plug-in port provided on the power interface 1301. When the two ends of the conductive structure 2 are provided with corresponding connectors (such as bolts, crimp terminals, or pins), mechanical fixing and electrical conduction with the conductive connection part 13010 of the power interface 1301 can be quickly achieved by tightening, crimping, or plugging. This detachable connection method allows operators to easily install or remove the conductive structure 2 at the designated maintenance door 111 after opening it, thereby realizing convenient assembly and disassembly of the power circuit connection between the modular components 1 and significantly improving maintenance and assembly efficiency.

[0055] Of course, it should be noted that the power interface 1301 also includes parts other than the conductive connection portion 13010, such as the conductor body and internal connection section, which is not a limitation. In this specification, the power interface 1301 includes a conductive bus, and the end portion of the conductive bus constitutes its conductive connection portion 13010.

[0056] like Figure 1 and Figure 2 As shown, the main reference is... Figure 2 In some embodiments, the direction in which multiple modular components 1 are sequentially distributed is the first direction U, and the maintenance door 111 is located on the second direction V. The power interface 1301 has a conductive connection portion 13010 for detachable connection with the conductive structure 2. At least two power interfaces 1301 corresponding to the same maintenance door 111 are sequentially distributed in the second direction V (for example, at least two power interfaces 1301 in the operable area of ​​the same maintenance door 111 are sequentially distributed in the second direction V). Among any two adjacent power interfaces 1301 on the second direction V, the one farther from the maintenance door 111 is the inner interface, and the one closer to the maintenance door 111 is the outer interface. The projection of the conductive connection portion 13010 of the inner interface on the maintenance door 111 in the second direction V and the projection of the outer interface on the maintenance door 111 in the second direction V do not overlap.

[0057] like Figure 2 and Figure 14As shown, the two power interfaces 1301 of the first power interface group 13A are distributed sequentially in the second direction V. Among the two adjacent power interfaces 1301 (the first DC power interface 13011 and the first AC power interface 13013, respectively) in the second direction V, the one farther from the first door 111A is the inner interface (the first AC power interface 13013), and the one closer to the first door 111A is the outer interface (the first DC power interface 13011). The projection of the conductive connection part 13010 of the inner interface (the first AC power interface 13013) onto the first door 111A in the second direction V and the projection of the outer interface (the first DC power interface 13011) onto the first door 111A in the second direction V do not overlap.

[0058] In this case, the projection of the inner interface (e.g., the first AC power interface 13013) in the second direction V onto the first door 111A and the projection of the outer interface (e.g., the first DC power interface 13011) in the second direction V onto the first door 111A can partially overlap. Only the conductive connection portion 13010 of the inner interface (e.g., the first AC power interface 13013) needs to be operable after the first door 111A is opened.

[0059] Thus, the conductive connection 13010 of the inner interface and the outer interface are spatially staggered, ensuring that when an operator operates through the opened access door 111, the outer interface will not obstruct the operation path to the conductive connection 13010 of the inner interface. Operating tools (such as wrenches and screwdrivers) can access and operate the conductive connection 13010 of the inner interface without obstruction, thereby greatly improving the operability and maintenance convenience when multiple power interfaces 1301 are arranged sequentially in the second direction V, effectively solving the problem of operational interference in a compact space. For example, before connecting the conductive connection 13010, after opening the first door 111A, the inner interface (e.g., before the conductive connection 13010 is connected, the inner interface can be observed at the first door 111A) through the first door 111A. Figure 2 As shown, the conductive connection portion 13010 of the first AC power interface 13013 of the first power interface group 13A and the external interface (e.g., Figure 2 As shown, the conductive connection portion 13010 of the first DC power interface 13011 of the first power interface group 13A can first be used for the inner interface (e.g., Figure 2 As shown, the conductive connection portion 13010 of the first AC power interface 13013 of the first power interface group 13A is connected to the corresponding conductive structure 2, and then the external interface (e.g.) is connected. Figure 2 As shown, the connection operation of the conductive connection part 13010 of the first AC power interface 13013 of the first power interface group 13A with the corresponding conductive structure 2 is described. The disassembly process of the conductive connection part 13010 is the reverse of this, and will not be described again here.

[0060] like Figure 2 and Figure 3 As shown, the main reference is... Figure 3 In some embodiments, at least two power interfaces 1301 corresponding to the same maintenance door 111 are sequentially distributed in a third direction W (for example, at least two power interfaces 1301 within the operable area of ​​the same maintenance door 111 are sequentially distributed in a third direction W), and the third direction W, the first direction U, and the second direction V are arranged in pairs. Specifically, the power interfaces 1301 sequentially distributed in the third direction W partially or completely overlap with the projection of the third direction W onto a plane perpendicular to the third direction W.

[0061] In some scenarios, all power interfaces 1301 can be distributed sequentially in the third direction W. This means that all power interfaces 1301 are approximately equidistant from the access door 111 in the second direction V, allowing the conductive connection portion 13010 of each power interface 1301 to be directly exposed to the outside view of the access door 111. Operators can access any connection point without moving other components. This layout is particularly suitable for applications with high interface accessibility requirements, significantly improving the efficiency and reliability of the main power circuit connections between modular components 1.

[0062] Of course, in situations where space is limited, the power interfaces 1301 within the operable area of ​​the same access door 111 can adopt a combination of the two layout schemes described above. Specifically, at least two power interfaces 1301 within the operable area of ​​the same access door 111 are sequentially distributed in the second direction V, and at least two power interfaces 1301 are sequentially distributed in the third direction W, such as... Figures 1 to 3 In the illustrated scheme, the DC interface group 131 and AC interface group 132 of the first power interface group 13A are sequentially distributed in the second direction V. The three first AC power interfaces 13013 of the AC interface group 132 of the first power interface group 13A are sequentially distributed in the third direction W. The two first DC power interfaces 13011 of the DC interface group 131 of the first power interface group 13A are sequentially distributed in the third direction W. Correspondingly, the DC interface group 131 and AC interface group 132 of the second power interface group 13B are sequentially distributed in the second direction V. The three second AC power interfaces 13014 of the AC interface group 132 of the second power interface group 13B are sequentially distributed in the third direction W. The two second DC power interfaces 13012 of the DC interface group 131 of the second power interface group 13B are sequentially distributed in the third direction W. In this way, a larger number of power interfaces 1301 can be arranged in a limited space.

[0063] In some embodiments, the first direction U is the vertical direction, and the second direction V is the horizontal direction, extending along the length or width of the bottom surface of the cabinet 11. For example... Figure 1-3and Figure 4-6 In the middle, the second direction V corresponds to the length direction of the bottom surface of cabinet 11, such as... Figure 7 In the middle, the second direction V is the width direction of the bottom surface of the cabinet 11.

[0064] In this way, multiple modular components 1 are stacked together vertically, allowing operators to assemble and disassemble the power interface 1301 and the conductive structure 2 in the horizontal direction. This helps save the floor space of the power conversion unit and facilitates the assembly and disassembly of the power interface 1301 and the conductive structure 2.

[0065] In some embodiments, the first direction U and the second direction V are both horizontal. The first direction U extends along one of the length and width directions of the bottom surface of the cabinet 11, and the second direction V extends along the other of the length and width directions of the bottom surface of the cabinet 11, which is not shown in the figure.

[0066] In this configuration, multiple modular components 1 are arranged sequentially in a horizontal direction, allowing operators to assemble and disassemble the power interface 1301 and the conductive structure 2 from another horizontal direction. This helps reduce the space occupied by the power conversion unit in the vertical direction and facilitates the assembly and disassembly of the power interface 1301 and the conductive structure 2.

[0067] In some embodiments, the second direction V extends along the width direction of the bottom surface of the cabinet 11, and all power interfaces 1301 of the same modular component 1 are correspondingly set with the same set maintenance door 111 (for example, all power interfaces 1301 of the same modular component 1 are located in the operable area of ​​the same set maintenance door 111), and are distributed sequentially in the third direction W.

[0068] like Figure 7 As shown, since the second direction V extends along the width direction of the bottom surface of the cabinet 11, and the first direction U is consistent with the up and down direction, the third direction W is consistent with the length direction of the bottom surface of the cabinet 11. The operable area of ​​the inspection door 111 is set to have a larger space in this length direction, so all the power interfaces 1301 of the same modular component 1 can be set to be distributed sequentially in the third direction W.

[0069] In another scheme, when the first direction U is consistent with the length direction of the bottom surface of the cabinet 11, the third direction W is consistent with the vertical direction. The operable area of ​​the inspection door 111 is set to have a larger space in the vertical direction, so all the power interfaces 1301 of the same modular component 1 can be set to be distributed sequentially in the third direction W.

[0070] In this way, the space of the cabinet 11 in the third direction W (vertical or longitudinal direction) can be fully utilized to arrange all the power interfaces 1301 of the same modular component 1 in sequence, which facilitates the position design of the power interface 1301 and its associated structure, and facilitates the connection or disassembly of the power interface 1301 and the corresponding conductive structure 2.

[0071] like Figure 3 As shown, in some embodiments, the conductive connection portions 13010 of the same pair of power interfaces 1301 connected to the same conductive structure 2 coincide in the projection of the first direction U onto the setting surface. The setting surface is a plane perpendicular to the first direction U. The first distances corresponding to different pairs of power interfaces 1301 connected to different conductive structures 2 are equal. The first distance is the distance of the conductive connection portions 13010 of the same pair of power interfaces 1301 in the first direction U.

[0072] like Figure 3 As shown, exemplarily, the conductive connection portion 13010 of the first DC power interface 13011 for input of the first power interface group 13A and the conductive connection portion 13010 of the second DC power interface 13012 for input of the second power interface group 13B are a pair for connection with the same conductive structure 2. The projections of these two conductive connection portions 13010 on the setting surface in the first direction U coincide, and the distance between them in the first direction U is a first distance. The conductive connection portion 13010 of the A-phase first AC power interface 13013 of the first power interface group 13A and the conductive connection portion 13010 of the A-phase second AC power interface 13014 of the second power interface group 13B are a pair for connection with the same conductive structure 2. The projections of these two conductive connection portions 13010 on the setting surface in the first direction U coincide, and the distance between them in the first direction U is a first distance.

[0073] In this way, the lengths of each conductive structure 2 can be consistent. When the cross-sectional dimensions of the conductive structures 2 are consistent (the dimensions of multiple conductive structures 2 used for DC power transmission are consistent, and the dimensions of multiple conductive structures 2 used for AC power transmission are consistent), the conductive structures 2 can be interchangeable. Operators do not need to specifically match conductive structures 2 of different sizes to meet the length requirements of a specific first distance. This helps reduce the difficulty of modular assembly of material types and power conversion units, and improves the efficiency of modular assembly and disassembly of power conversion units. However, it should be understood that this is not a limitation. The projections of the conductive connection portions 13010 of the same pair of power interfaces 1301 connected to the same conductive structure 2 onto the set plane in the first direction U may not coincide, or may only partially coincide.

[0074] In some embodiments, adjacent end faces of two adjacent cabinets 11 are provided with channels for the passage of the conductive structure 2 (this is an example and not a limitation). Specifically, when the first direction U is the vertical direction, the first cabinet 11A and the second cabinet 11B are provided with channels for the passage of the conductive structure 2 at adjacent end faces in the vertical direction. The channels can be wire holes, etc.

[0075] The conductive structure 2 can be a flexible connection structure, a rigid connection structure, etc., which can be selected according to actual needs. The flexible connection structure can be, for example, a copper braided wire. The flexible connection structure has higher positional adaptability, which is convenient to adapt to component assembly errors. In some scenarios, when only the flexible connection structure and the power interface 1301 at one end need to be disassembled, it can be bent so that it does not affect the separation of the modular component 1, which helps to improve the disassembly and assembly efficiency of the modular component 1.

[0076] In some embodiments, multiple modular components 1 include a first modular component 1A and a second modular component 1B. The functional module 12 of the first modular component 1A includes a power component of the inverter power module and a DC capacitor component 124 of the inverter power module. The functional module 12 of the second modular component 1B includes a DC power distribution module 121, an AC filter module, and an AC power distribution module 123. The DC power distribution module 121, the DC capacitor component 124, the power component, the AC filter module, and the AC power distribution module 123 are electrically connected in sequence. The DC power distribution module 121 and the DC capacitor component 124 are electrically connected through the DC interface group 131 of the power interface group 13 between the first modular component 1A and the second modular component 1B. The output end of the power component and the AC filter module are electrically connected through the AC interface group 132 of the power interface group 13 between the first modular component 1A and the second modular component 1B.

[0077] Thus, the DC interface group 131 and the AC interface group 132 together form the core bridge for the main power circuit connection between the modular components 1. Through centralized and detachable layout design, the assembly efficiency and maintenance convenience of the power conversion unit are significantly improved.

[0078] Furthermore, the first cabinet 11A of the first modular component 1A has a high-protection cavity with a relatively high protection level and a low-protection cavity with a relatively low protection level. The fan and heat sink for cooling the inverter power module are located in the low-protection cavity, while the power components, DC capacitor components 124 and corresponding control circuits of the inverter power module are located in the high-protection cavity.

[0079] The second cabinet 11B of the second modular component 1B has a high-protection cavity with a relatively high protection level and a low-protection cavity with a relatively low protection level. The DC power distribution module 121 and the AC power distribution module 123 are located in the high-protection cavity, and the reactor 122 of the AC filter section is located in the low-protection cavity. Of course, multiple components can be arranged in the same protective cavity or in different protective cavities.

[0080] In this way, while ensuring a high level of protection, the power conversion unit significantly improves the system's assembly efficiency and ease of operation and maintenance through a centralized and detachable layout design.

[0081] like Figure 16 As shown, another embodiment of this disclosure provides a power converter, which includes the power conversion unit as described in the above embodiment. The power converter may be an inverter, a rectifier, or a bidirectional converter, etc.

[0082] For example, the power converter is a photovoltaic grid-connected inverter, which includes one or more inverter units (the inverter units are the power conversion units in the above embodiments). The photovoltaic grid-connected inverter also includes a transformer, a distribution cabinet, and an AC box. Multiple inverter units are connected in parallel and then connected to the transformer via the AC box. The transformer may have a high-voltage compartment, an operating compartment, and heat sinks, etc. The distribution cabinet integrates communication and power distribution functions, and the AC box is the junction box between the inverter units and the transformer. The photovoltaic grid-connected inverter may also include a base, on which the inverter units, transformer, distribution cabinet, and AC box are arranged.

[0083] In some embodiments, when there are multiple power conversion units, the length direction of the bottom surface of the cabinet 11 of each power conversion unit is consistent, and the width direction of the bottom surface of the cabinet 11 of each power conversion unit is consistent; wherein, for example Figure 8 and Figure 9 As shown, multiple power conversion units are distributed sequentially along the length direction, or, as... Figure 10-12 and Figure 16 As shown, multiple power conversion units are distributed sequentially along the width direction. Figure 8-12 As shown, each rectangle represents a power conversion unit. This facilitates the formation of a power conversion unit group from multiple power conversion units, and makes it easier to arrange the power conversion unit group at the location of the power converter.

[0084] In some embodiments, among all power conversion units distributed sequentially in the same direction, at least one access door 111 of each cabinet 11 is located at a non-connected point of adjacent power conversion units.

[0085] For example Figure 16In this embodiment, four power conversion units are arranged sequentially along the X-axis. In each cabinet 11, at least one maintenance door 111 is provided. The cabinet 11 is not located at an end face adjacent to another power conversion unit. The following description exemplifies this embodiment by assuming that the first direction U corresponding to each power conversion unit is consistent with the up-down direction.

[0086] like Figure 8 and Figure 9 As shown, exemplarily, among all the power conversion units sequentially distributed along the length direction of the bottom surface of the cabinet 11, the second direction V corresponding to the power conversion unit located at the end of the length direction is the length direction ( Figure 8 ) or width direction ( Figure 9 ).

[0087] like Figure 8 As shown, when the second direction V of the power conversion unit located at the end is the length direction, the setting maintenance door 111 of the power conversion unit at the end and the power interface 1301 corresponding to the setting maintenance door 111 are arranged at least at one end of the length direction away from the other power conversion units.

[0088] like Figure 9 As shown, when the number of all the power conversion units distributed along the length direction is greater than or equal to three, the second direction V corresponding to the other power conversion units outside the two ends is the width direction.

[0089] like Figure 10-12 and Figure 16 As shown, exemplarily, among all the power conversion units sequentially distributed along the width direction, the second direction V corresponding to the power conversion unit located at the end is the length direction ( Figure 10 , Figure 11 and Figure 16 ) or width direction ( Figure 12 ).

[0090] like Figure 12 As shown, when the second direction V of the power conversion unit located at the end is the width direction, in the width direction, the setting maintenance door 111 of the power conversion unit at the end and the power interface 1301 corresponding to the setting maintenance door 111 are arranged at least at one end of the width direction away from the other power conversion units.

[0091] like Figure 10-12 As shown, when the number of all the power conversion units distributed in the width direction is greater than or equal to three, the second direction V corresponding to the other power conversion units outside the two ends is the length direction.

[0092] Another embodiment of this disclosure provides a power system that includes the power conversion unit as described in the above embodiments, or includes the power converter as described in the above embodiments. The power system may be, for example, a photovoltaic power generation system or an energy storage system, which possesses all the beneficial effects of the power conversion unit, and will not be described in detail here.

[0093] While the above disclosure is provided, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the scope of protection of this disclosure.

Claims

1. A power conversion unit, characterized in that, The system includes multiple modular components (1), which are arranged sequentially. Each modular component (1) includes a cabinet (11) and a functional module (12) and a power interface group (13) located within the cabinet (11). Each cabinet (11) has a setting inspection door (111) at at least one end face. In the same cabinet (11), the setting inspection door (111) is correspondingly set with the power interface (1301) of the power interface group (13). Each cabinet (11) has the setting inspection door (111) arranged at at least one setting side of the power conversion unit. The positions of the power interface groups (13) of two adjacent modular components (1) are corresponding, and the multiple power interfaces (1301) of the corresponding two power interface groups (13) are connected by a conductive structure (2).

2. The power conversion unit as described in claim 1, characterized in that, The plurality of modular components (1) include a first modular component (1A) and a second modular component (1B). The power interface group (13) of the first modular component (1A) is a first power interface group (13A), and the power interface group (13) of the second modular component (1B) is a second power interface group (13B). Both the first power interface group (13A) and the second power interface group (13B) include a DC interface group (131) and an AC interface group (132). All power interfaces (1301) of the same DC interface group (131) are correspondingly provided with the same setting inspection door (111). The setting inspection door (111) corresponding to the DC interface group (131) of the first power interface group (13A) and the setting inspection door (111) corresponding to the DC interface group (131) of the second power interface group (13B) are located on the same setting side of the power conversion unit. All power interfaces (1301) of the same AC interface group (132) are correspondingly set with the same setting inspection door (111). The setting inspection door (111) corresponding to the AC interface group (132) of the first power interface group (13A) and the setting inspection door (111) corresponding to the AC interface group (132) of the second power interface group (13B) are located on the same setting side of the power conversion unit.

3. The power conversion unit as described in claim 2, characterized in that, The DC interface group (131) and the AC interface group (132) of the first power interface group (13A) are respectively set with the same set maintenance door (111), and the DC interface group (131) and the AC interface group (132) of the second power interface group (13B) are respectively set with the same set maintenance door (111).

4. The power conversion unit as described in claim 2, characterized in that, The set maintenance door (111) corresponding to the DC interface group (131) of the first power interface group (13A) is the first door (111A), and the set maintenance door (111) corresponding to the DC interface group (131) of the second power interface group (13B) is the second door (111B); the set maintenance door (111) corresponding to the AC interface group (132) of the first power interface group (13A) is the third door (111C), and the set maintenance door (111) corresponding to the AC interface group (132) of the second power interface group (13B) is the fourth door (11D). The first gate (111A) and the second gate (111B) are both located on the same setting side of the power conversion unit; the third gate (111C) and the fourth gate (11D) are both located on the other setting side of the power conversion unit.

5. The power conversion unit as described in claim 4, characterized in that, The first door (111A) and the third door (111C) are arranged opposite to each other, and the second door (111B) and the fourth door (11D) are arranged opposite to each other.

6. The power conversion unit as described in claim 5, characterized in that, The second power interface group (13B) includes a DC power distribution module (121) and an AC power distribution module (123) in its functional module (12); the DC power distribution module (121) is located near the second gate (111B), and the AC power distribution module (123) is located near the fourth gate (11D).

7. The power conversion unit as described in any one of claims 1 to 6, characterized in that, The direction in which the multiple modular components (1) are distributed sequentially is the first direction (U), and the designated inspection door (111) is located in the second direction (V); The power interface (1301) has a conductive connection part (13010) for detachable connection with the conductive structure (2). At least two power interfaces (1301) corresponding to the same set maintenance door (111) are distributed in the second direction (V). Among any two adjacent power interfaces (1301) in the second direction (V), the one farther away from the set maintenance door (111) is the inner interface, and the one closer to the set maintenance door (111) is the outer interface. The projection of the conductive connection part (13010) of the inner interface in the second direction (V) onto the set maintenance door (111) and the projection of the outer interface in the second direction (V) onto the set maintenance door (111) do not overlap. And / or, at least two of the power interfaces (1301) corresponding to the same set maintenance door (111) are distributed sequentially in the third direction (W), and the third direction (W), the first direction (U) and the second direction (V) are arranged in pairs.

8. The power conversion unit as described in claim 7, characterized in that, The first direction (U) is the vertical direction, and the second direction (V) is the horizontal direction, extending along the length or width of the bottom surface of the cabinet (11).

9. The power conversion unit as described in claim 7, characterized in that, Both the first direction (U) and the second direction (V) are horizontal. The first direction (U) extends along one of the length and width directions of the bottom surface of the cabinet (11), and the second direction (V) extends along the other of the length and width directions of the bottom surface of the cabinet (11).

10. The power conversion unit as described in claim 7, characterized in that, The second direction (V) extends along the width direction of the bottom surface of the cabinet (11), and all the power interfaces (1301) of the same modular component (1) are correspondingly set with the same set maintenance door (111) and are distributed sequentially in the third direction (W).

11. The power conversion unit according to any one of claims 1 to 6, characterized in that, The adjacent end faces of two adjacent cabinets (11) are provided with channels for the passage of the conductive structure (2).

12. The power conversion unit as described in any one of claims 1 to 6, characterized in that, The conductive structure (2) is a flexible connection structure.

13. The power conversion unit as described in any one of claims 2 to 5, characterized in that, The first modular component (1A) has a functional module (12) including a power component of an inverter power module and a DC capacitor component (124) of the inverter power module. The second modular component (1B) has a functional module (12) including a DC power distribution module (121), an AC filter module and an AC power distribution module (123). The DC power distribution module (121), the DC capacitor component (124), the power component, the AC filter module and the AC power distribution module (123) are connected in sequence. The DC power distribution module (121) and the DC capacitor component (124) are connected through the DC interface group (131) of the power interface group (13) between the first modular component (1A) and the second modular component (1B). The output end of the power component and the AC filter module are connected through the AC interface group (132) of the power interface group (13) between the first modular component (1A) and the second modular component (1B).

14. A power converter, characterized in that, It includes one or more power conversion units as described in any one of claims 1-13.

15. The power converter as described in claim 14, characterized in that, When there are multiple power conversion units, the length direction of the bottom surface of the cabinet (11) of each power conversion unit is consistent, and the width direction of the bottom surface of the cabinet (11) of each power conversion unit is consistent. The power conversion units are distributed sequentially along the length direction, or the power conversion units are distributed sequentially along the width direction.

16. The power converter as described in claim 15, characterized in that, In all the power conversion units distributed sequentially along the same direction, at least one of the cabinets (11) has a set maintenance door (111) located at a non-connected point of the adjacent power conversion units.

17. An electric power system, characterized in that, It includes the power conversion unit as described in any one of claims 1 to 13, or the power converter as described in any one of claims 14 to 16.

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