阅读说明：本技术 一种变流器 (Current transformer ) 是由 杨明明 李嘉伦 郭钦鑫 曾伟 李韶鹏 叶胜林 于 2021-08-23 设计创作，主要内容包括：本发明提供一种变流器,包括并网控制柜以及功率柜,功率柜的第一面与并网控制柜的第二面彼此接触。其中,并网控制柜包括第一腔体,第一腔体内布置有直流保护模块、交流保护模块、控制模块以及用于对第一腔体内布置的一个或多个部件进行散热的第一散热模块；以及功率柜包括第二腔体以及第三腔体,其中,第二腔体包括第一面的第一部分,内部布置有电抗器组件以及对第二腔体内布置的一个或多个部件进行散热的第二散热模块；以及第三腔体包括第一面的第二部分,内部布置有包括功率模块、电容滤波模块以及对第三腔体内布置的一个或多个部件进行散热的第三散热模块。(The invention provides a converter which comprises a grid-connected control cabinet and a power cabinet, wherein a first surface of the power cabinet is in contact with a second surface of the grid-connected control cabinet. The grid-connected control cabinet comprises a first cavity, wherein a direct current protection module, an alternating current protection module, a control module and a first heat dissipation module for dissipating heat of one or more components arranged in the first cavity are arranged in the first cavity; the power cabinet comprises a second cavity and a third cavity, wherein the second cavity comprises a first part of a first surface, a reactor assembly is arranged in the second cavity, and a second heat dissipation module is used for dissipating heat of one or more components arranged in the second cavity; and the third cavity comprises a second part of the first surface, and a third heat dissipation module which comprises a power module, a capacitance filtering module and one or more components arranged in the third cavity for heat dissipation is arranged in the third cavity.)

1. A current transformer, comprising:

the grid-connected control cabinet comprises a first cavity, wherein a direct current protection module, an alternating current protection module, a control module and a first heat dissipation module are arranged in the first cavity, and the first heat dissipation module is configured to dissipate heat of one or more components arranged in the first cavity; and

a power cabinet, a first side of the power cabinet and a second side of the grid-connected control cabinet being in contact with each other, the power cabinet comprising:

a second cavity comprising a first portion of the first face, wherein a reactor assembly and a second heat dissipation module are disposed within the second cavity, wherein the second heat dissipation module is configured to dissipate heat from one or more components disposed within the second cavity; and

a third cavity comprising a second portion of the first face, wherein a power module, a capacitive filtering module, and a third heat dissipation module are disposed within the third cavity, wherein the third heat dissipation module is configured to dissipate heat from one or more components disposed within the third cavity.

2. The converter according to claim 1, wherein the first surface is a surface of the power cabinet from which a wire can be drawn at a shortest wiring distance, and the second surface is a surface of the grid-connected control cabinet from which a wire can be drawn at a shortest wiring distance.

3. The converter according to claim 1, wherein the dc side employs a double parallel scheme comprising at least two of said power modules, capacitive filter modules, reactor assemblies and dc protection modules.

4. The current transformer of claim 1, wherein the first heat dissipation module comprises a first heat dissipation fan and a heat exchanger, the first heat dissipation module being disposed at a top of the first cavity; and/or

The second heat dissipation module comprises a second heat dissipation fan and a heat exchanger, and is arranged at the top of the second cavity; and/or

The third heat dissipation module comprises a third heat dissipation fan and a heat exchanger, and the third heat dissipation module is arranged at the bottom of the third cavity.

5. The converter of claim 1, wherein the capacitive filter module is electrically connected to the dc protection module and the power module, and the power module is electrically connected to the reactor assembly, the reactor assembly being electrically connected to the ac protection module.

6. The converter according to claim 1, wherein the grid-connected control cabinet further comprises an external interface, the external interface is disposed at the bottom of the first cavity, the dc protection module and the ac protection module are connected to the external interface through copper bars, and the external interface is connected to an external battery pack and a box transformer unit through cables.

7. The converter according to claim 1, wherein the ac protection module and the dc protection module comprise electrical devices having circuit protection functions.

8. The current transformer of claim 1, further comprising:

the direct current pre-charging module is arranged on one side of the direct current protection module;

the alternating current pre-charging module and the direct current pre-charging module share a resistor and are arranged on one side of the direct current protection module; and

and the alternating current filtering module is arranged on one side of the alternating current protection module.

9. The converter according to claim 6, further comprising an AC lightning protection module and a DC lightning protection module, the AC lightning protection module and the DC lightning protection module being disposed on one side of the external interface.

10. The current transformer of claim 1, further comprising:

the direct current electromagnetic interference EMI module is arranged on an electrical connecting piece of the direct current protection module and the capacitance filtering module; and

and the alternating current electromagnetic interference EMI module is arranged on an electrical connecting piece of the alternating current protection module and the reactor component.

Technical Field

The invention relates to the technical field of energy storage, in particular to a converter.

Background

In recent years, with the rapid development of converters, the single-machine capacity of the converters is increasing, and the power density requirements of the converters are also increasing. The existing converter cabinet is generally designed to be formed by combining a plurality of cabinet bodies, including a grid-connected cabinet, a power distribution cabinet, a power cabinet, a control cabinet and the like, and has the problems of large volume, low power density, high cost, inconvenience in transportation, difficulty in installation and the like due to small arrangement space in the field application process.

Aiming at the problems, a plurality of converters are structurally improved, so that the space in a cabinet can be fully utilized and the power density can be improved on the premise of meeting the functional requirements. For example, patent 201921122901.2 discloses an energy storage converter structure, which adopts a vertical partition plate to divide an energy storage converter cabinet into two chambers, namely a power distribution chamber and a power chamber, and divides each functional module and device in the energy storage converter into two chambers according to functions, and the layout makes the overall volume of the energy storage converter relatively small, thereby improving the power density. For another example, patent 202011222470.4 discloses a power cabinet and a current transformer, in which a cabinet body is divided into an upper cavity and a lower cavity by a transverse partition plate with a through hole, a power module is disposed in the lower cavity, and a reactor is disposed in the upper cavity, so that a cooling air flow enters from below and then is discharged after passing through the power module and the reactor in sequence.

Disclosure of Invention

In order to improve the power density of the converter, the invention provides a converter, comprising:

the grid-connected control cabinet comprises a first cavity, wherein a direct current protection module, an alternating current protection module, a control module and a first heat dissipation module are arranged in the first cavity; and

the power cabinet, set up in one side of the switch board is incorporated into the power networks, with the switch board is incorporated into the power networks adopts back-to-back connection, and includes:

the reactor component and the second heat dissipation module are arranged in the second cavity; and

and the third cavity is arranged above the second cavity, and a power module, a capacitance filtering module and a third heat dissipation module are arranged inside the third cavity.

Furthermore, the power modules, the capacitor filter modules, the reactor assembly and the direct current protection modules are all two groups.

Further, the first heat dissipation module comprises a first heat dissipation fan and a heat exchanger, and the first heat dissipation module is arranged at the top of the first cavity; and/or

The second heat dissipation module comprises a second heat dissipation fan and a heat exchanger, and is arranged at the top of the second cavity; and/or

The third heat dissipation module comprises a third heat dissipation fan and a heat exchanger, and the third heat dissipation module is arranged at the bottom of the third cavity.

Furthermore, the capacitor filtering module is connected with the direct current protection module and the power module through a copper bar or a cable.

Further, the power module is connected with the reactor component through a copper bar or a cable.

Further, the reactor component is connected with the current protection module through a copper bar or a cable.

Further, the grid-connected control cabinet further comprises an external interface, the external interface is arranged at the bottom of the first cavity, the direct-current protection module is connected with an external battery pack through a copper bar or a cable, and the alternating-current protection module is connected with an external box transformer unit through a copper bar or a cable.

Furthermore, the ac protection module and the dc protection module may be circuit breakers, disconnectors, contactors, or other electrical devices having a circuit protection function.

Further, the converter further includes:

the direct current pre-charging module is arranged on one side of the direct current protection module;

the alternating current pre-charging module and the direct current pre-charging module share a resistor and are arranged on one side of the direct current protection module; and

and the alternating current filtering module is arranged on one side of the alternating current protection module.

Furthermore, the converter further comprises an alternating current lightning protection module and a direct current lightning protection module, wherein the alternating current lightning protection module and the direct current lightning protection module are arranged on one side of the external interface.

Further, the converter further includes:

the direct current electromagnetic interference EM I module is arranged on an electrical connecting piece of the direct current protection module and the capacitance filtering module; and

and the alternating current electromagnetic interference EM I module is arranged on an electric connecting piece of the alternating current protection module and the reactor component.

In the present invention, the "back-to-back connection" means that a first surface of the power cabinet and a second surface of the grid-connected control cabinet are in contact with each other, wherein the first surface is a surface of the power cabinet from which a wire can be drawn out at a shortest wiring distance, and the second surface is a surface of the grid-connected control cabinet from which a wire can be drawn out at a shortest wiring distance.

The converter provided by the invention can be used as an energy storage converter, for example, the converter is divided into three cavities, and an independent heat dissipation structure is arranged in each cavity, so that each device has a good heat dissipation environment and high heat dissipation efficiency. In addition, all devices and modules of the converter are arranged in different cavities according to functions, a double-parallel structure is preferably adopted on the direct current side, namely two groups of power modules, a capacitor filter module and a reactor assembly are placed in a power cabinet, and two groups of direct current protection modules are placed in a grid-connected control cabinet, so that the structure is compact, the whole machine volume is small, and the power density is high. Meanwhile, the grid-connected control cabinet and the power cabinet adopt a back-to-back mode, the path of an electrically connected bus is shortest, and particularly for double parallel circuits, the current equalizing is good and the cost is low.

Drawings

To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the present invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for clarity.

Fig. 1 shows a schematic structural diagram of a current transformer according to an embodiment of the present invention; and

fig. 2 shows a front view of a current transformer according to an embodiment of the invention.

Detailed Description

In the following description, the present invention is described with reference to examples. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details, or with other alternative and/or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention. Similarly, for purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the embodiments of the invention. However, the invention is not limited to these specific details. Further, it should be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.

Reference in the specification to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

It is further noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that, given the teachings of the present invention, required components or assemblies may be added as needed in a particular scenario.

It is also noted herein that, within the scope of the present invention, the terms "same", "equal", and the like do not mean that the two values are absolutely equal, but allow some reasonable error, that is, the terms also encompass "substantially the same", "substantially equal". By analogy, in the present invention, the terms "perpendicular", "parallel" and the like in the directions of the tables also cover the meanings of "substantially perpendicular", "substantially parallel".

In order to improve the power density of the converter and ensure the maintainability and the heat dissipation performance of the converter, the invention provides the converter, which divides the converter into three cavities, and an independent heat dissipation structure is arranged in each cavity, so that each device has a good heat dissipation environment and high heat dissipation efficiency. In addition, each device and each module are arranged in different cavities according to functions of the converter, a double parallel structure is preferably adopted on a direct current side, namely two groups of power modules, a capacitor filter module and a reactor assembly are placed in a power cabinet, and two groups of direct current protection modules are placed in a grid-connected control cabinet, so that the converter is compact in structure, small in overall size and high in power density. Meanwhile, the grid-connected control cabinet and the power cabinet adopt a back-to-back mode, the path of an electrically connected bus is shortest, and particularly for double parallel circuits, the current equalizing is good and the cost is low. The solution of the invention is further described below with reference to the accompanying drawings of embodiments.

Fig. 1 shows a schematic structural diagram of a current transformer according to an embodiment of the present invention. As shown in fig. 1, a converter is internally divided into a grid-connected control cabinet 100 and a power cabinet 200 by a vertical partition 001. The vertical partition 001 may be connected to the housing or the framework of the converter, for example, by screws, welding, clamping, or the like.

The grid-connected control cabinet comprises a first cavity 101, wherein a direct current protection module 111, an alternating current protection module 112, a control module 113 and a first heat dissipation module 114 are arranged in the first cavity 101. Fig. 2 shows a front view of a converter according to an embodiment of the present invention, as shown in fig. 2, in an embodiment of the present invention, the control module 113 is disposed at a side of the first cavity opposite to the vertical partition 001, the dc protection module 111 is disposed between the control module 113 and the vertical partition 001, and the ac protection module 112 is disposed below the dc protection module 111. For convenience of operation and maintenance, in an embodiment of the present invention, the control module 113 is disposed on a mechanical mounting frame, which is disposed on a side of the first cavity opposite to the vertical partition 001 and is openable and closable, so as to facilitate maintenance and control operations, and protect the dc protector module 111 disposed at the rear of the mechanical mounting frame. In an embodiment of the present invention, the first heat dissipation module 114 is disposed at the top of the first cavity, blows air downwards, forms a circulation air channel in the first cavity, and dissipates heat of one or more components disposed in the first cavity. In an embodiment of the present invention, the ac protection module 112 and the dc protection module 11 may adopt an electric device having a circuit protection function, such as a circuit breaker, an isolating switch, or a contactor, and the specific structure thereof is a structure commonly used in the art and will not be described herein again.

In order to better realize the variable current, in an embodiment of the present invention, a dc pre-charge module 115, an ac pre-charge module 116 and an ac filter module 117 are further disposed in the first cavity, wherein the DC pre-charge module 115 is disposed adjacent to the DC protection module 111, to facilitate dc access wiring, it is preferably located on the upper side of the dc protection module, the ac pre-charge module 116 and the ac filter module 117 are located adjacent to the ac protection module 112, to facilitate ac inlet and outlet wiring, the ac filtering module 117 is preferably disposed on both sides of the ac protection module 112, in one embodiment of the present invention, the ac pre-charge module 116 and the dc pre-charge module 115 share a resistor, therefore, the ac precharge module 116 is preferably disposed at a side of the dc protection module 111.

In order to realize connection with an external battery pack and a box-type substation unit, in an embodiment of the present invention, the converter further includes an external interface 118, the external interface 118 is disposed at the bottom of the first cavity 101, and the dc protection module 111 and the ac protection module 112 are respectively connected to the external battery pack and the box-type substation unit through the external interface 118. In an embodiment of the present invention, the dc side of the converter is connected to the outside by a cable, and is internally connected to an incoming copper bar, specifically, the external interface is connected to the dc protection module by the incoming copper bar and is connected to an external battery pack by a cable, and the dc protection module 111 can be connected to the incoming copper bar by a screw. Similarly, the ac protection module 112 may be provided with an outgoing copper bar, and the outgoing copper bar is connected to an external box transformer unit after being connected to a cable through the external interface 118. It should be understood that, in other embodiments of the present invention, the external interface and the dc protection module and/or the ac protection module may also be electrically connected by a cable or other means, and the electrical connection of the external interface and the external battery pack and the box transformer unit may also be implemented by other electrical connection means commonly used in the art. In order to avoid lightning damage, in an embodiment of the invention, the converter further includes an ac lightning protection module 119 and a dc lightning protection module 1110, the ac lightning protection module 119 is disposed at the bottom of the first cavity 101, so as to facilitate wiring from the outlet copper bar of the ac protection module 112; and the dc lightning protection module 1110 is disposed at the bottom of the first cavity 101, so as to facilitate wiring from the incoming copper bar of the dc protection module 111.

The power cabinet 200 and the grid-connected control cabinet 100 are in a back-to-back mode, and devices and/or modules inside the power cabinet 200 and the grid-connected control cabinet 100 can be electrically connected in a copper bar or cable mode, so that the path of an electrically connected bus is shortest on one hand, and the converter can be maintained in a front-and-back mode on the other hand, namely, the power cabinet and the grid-connected control cabinet can be independently maintained from one side far away from the vertical partition plate respectively, specifically, if one side of the grid-connected control cabinet 100 is regarded as a front side and one side where the power cabinet 200 is located is regarded as a back side, the devices inside the power cabinet 200 are maintained from the back side, and the devices inside the grid-connected control cabinet 100 are maintained from the front side. Here, the term "back-to-back connection" means that a side of the power cabinet from which the lead can be drawn out at the shortest distance, that is, a first side of the power cabinet, and a side of the grid-connected control cabinet from which the lead can be drawn out at the shortest distance, and a second side of the grid-connected control cabinet, are in contact with each other.

The inside of the power cabinet is divided into a second cavity 201 and a third cavity 202 by a transverse partition board 002, wherein the second cavity 201 includes a first portion of a first surface of the power cabinet, and the third cavity 202 includes a second portion of the first surface of the power cabinet, and preferably, the second cavity 201 is located below the third cavity 202. The reactor assembly 211 and the second heat dissipation module 212 are disposed inside the second cavity 201, and the power module 221, the capacitance filter module 222 and the third heat dissipation module 223 are disposed inside the third cavity. The capacitance filtering module 222 is electrically connected to the dc protection module 111 in the first cavity 101, and is connected to the power module 221 in the third cavity 202, and the power module 221 is connected to the ac protection module 112 in the first cavity 101 through the reactor assembly 211. Specifically, the outgoing copper bar of the dc protection module 111 passes through the vertical partition 001 and is connected to the capacitor filter module 222, the capacitor filter module 222 is connected to the power module 221 by screws in the third cavity, the outgoing copper bar of the power module 221 passes through the horizontal partition 002 and is connected to the reactor assembly 211 in the second cavity 201, and the outgoing copper bar of the reactor assembly 211 passes through the vertical partition 001 and is connected to the ac protection module 112 in the first cavity 101. The ac protection module 112 and the dc protection module 111 correspond to the second cavity and the third cavity respectively, so as to ensure the shortest path of the main bus electrical apparatus.

The reactor assembly 211 is arranged inside the second cavity located below, mainly from the following insight of the inventor: the reactor subassembly's volume and weight are great, set up in the bottom of power cabinet, are favorable to guaranteeing the stability of cabinet body structure, simultaneously, because the existence of transverse partition 002, the cooperation sets up in the second heat dissipation module 212 at second cavity top, can be so that the inside wind channel that forms the self-loopa of second cavity dispels the heat to one or more parts of arranging in the second cavity, and then avoids the reactor heat to exert an influence to power module. In one embodiment of the present invention, the second heat dissipation module is disposed at the top of the second cavity, and in one embodiment of the present invention, the second heat dissipation module includes a second heat dissipation fan and a heat exchanger.

In an embodiment of the present invention, the third heat dissipation module is disposed at the bottom of the third cavity, and dissipates heat of one or more components disposed in the third cavity.

In order to improve the power density, in an embodiment of the present invention, a double parallel scheme is adopted on the dc side of the converter, that is, the power cabinet 200 includes two groups of power modules 221, a capacitor filter module 222, and a reactor assembly 211, and the grid-connected control cabinet 100 includes two groups of dc protection modules 111, and meanwhile, the main circuit devices are symmetrically arranged, so as to further optimize the current sharing effect.

In order to reduce the harmonic currents in the ac-side and dc-side loops of the converter, in one embodiment of the invention, the converter further comprises an electromagnetic interference EM I module, which comprises a dc electromagnetic interference EM I module 224 and an ac electromagnetic interference EM I module 213. The dc electromagnetic interference EM I module 224 is disposed on an electrical connection between the dc protection module 111 and the capacitive filtering module 222; and the ac electromagnetic interference EM I module 213 is disposed on an electrical connection between the ac protection module 112 and the reactor assembly 211.

The converter provided by the invention can be used as an energy storage converter and the like, has a compact structure and a small overall size, and can meet the requirement of high power density. The back-to-back connection is adopted, the bus connection path is shortest, and particularly for double parallel loops, the current sharing is good, the cost is low, meanwhile, a front and back maintenance mode can be realized, and the maintainability is high. The control module which needs to be operated frequently is arranged on the front side of the whole machine, and the operation is convenient. In addition, each cavity adopts independent heat dissipation module, and to the device requirement in the different cavities, independently set up the heat dissipation of each cavity, and then guarantee that ambient temperature satisfies the rated operating temperature of different devices, radiating efficiency is high.

While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to persons skilled in the relevant art that various combinations, modifications, and changes can be made thereto without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.