CN113691146B

CN113691146B - Current transformer

Info

Publication number: CN113691146B
Application number: CN202110965225.0A
Authority: CN
Inventors: 杨明明; 李嘉伦; 郭钦鑫; 曾伟; 李韶鹏; 叶胜林
Original assignee: Envision Energy Co Ltd
Current assignee: Envision Energy Co Ltd
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2023-06-23
Anticipated expiration: 2041-08-23
Also published as: CN113691146A

Abstract

The invention provides a converter which comprises a grid-connected control cabinet and a power cabinet, wherein a first surface of the power cabinet and a second surface of the grid-connected control cabinet are in contact with each other. 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 and a second heat dissipation module for dissipating heat of one or more components arranged in the second cavity are arranged in the second cavity; and the third cavity comprises a second part of the first face, and a third heat dissipation module which comprises a power module, a capacitance filtering module and dissipates heat of one or more components arranged in the third cavity is arranged in the third cavity.

Description

Current transformer

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 current transformers, the capacity of a single current transformer is continuously increased, and the power density requirement of the current transformer is also gradually increased. The existing converter cabinet is generally designed into a plurality of cabinet bodies which are combined and formed, and comprises a grid-connected cabinet, a power distribution cabinet, a power cabinet, a control cabinet and the like, and the problems of large volume, low power density, high cost, inconvenient transportation and difficult installation are frequently encountered 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 the 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 board to divide an energy storage converter cabinet body into two chambers of a power distribution chamber and a power chamber, and divides each functional module and device in the energy storage converter according to functions, and the functional modules and devices are closely arranged in the two chambers. 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 placed in a lower cavity, and a reactor is disposed in an upper cavity, so that cooling air flows from below and then sequentially passes through the power module and the reactor and is discharged.

Disclosure of Invention

In order to increase the power density of the current transformer, the invention provides 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 power cabinet is arranged on one side of the grid-connected control cabinet, is connected with the grid-connected control cabinet back to back, and comprises:

the second cavity is internally provided with a reactor assembly and a second heat dissipation module; 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 in the third cavity.

Further, the power module, the capacitance filter module, the reactor component and the direct current protection module are two groups.

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

Further, the capacitive filter module is connected with the direct current protection module and the power module through copper bars or cables.

Further, the power module is connected with the reactor assembly 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 the copper bar or the cable.

Further, the ac protection module and the dc protection module may be electrical devices having a circuit protection function, such as a circuit breaker, a disconnector, or a contactor.

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 precharge module and the direct current precharge module share a resistor and are arranged on one side of the direct current protection module; and

and the alternating current filter module is arranged at one side of the alternating current protection module.

Further, the converter further comprises an alternating current lightning protection module and a direct current lightning protection module, and 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 electric 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 invention, the back-to-back connection refers to that a first face of the power cabinet and a second face of the grid-connected control cabinet are in contact with each other, wherein the first face is a face of the power cabinet, from which wires can be led out at a shortest wiring distance, and the second face is a face of the grid-connected control cabinet, from which wires can be led out at a shortest wiring distance.

The converter provided by the invention can be used as an energy storage converter, the converter is divided into three cavities, and independent heat dissipation structures are arranged in the cavities, so that each device has a good heat dissipation environment and high heat dissipation efficiency. In addition, each device and module of the converter are arranged in different chambers according to functions, the direct current side is preferably in a double parallel structure, namely, two groups of power modules, capacitance filter modules and reactor components are arranged in the power cabinet, and two groups of direct current protection modules are arranged in the grid-connected control cabinet. Meanwhile, the grid-connected control cabinet and the power cabinet adopt a back-to-back mode, the electric connection bus path is shortest, and particularly for double parallel circuits, the current sharing 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 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, for clarity, the same or corresponding parts will be designated by the same or similar reference numerals.

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 various embodiments. 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. Furthermore, it should be understood that the embodiments shown in the drawings are illustrative representations and are not necessarily drawn to scale.

Reference throughout this 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 present 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 should also be 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 the components or assemblies may be added as needed for a particular scenario under the teachings of the present invention.

It should also be noted herein that, within the scope of the present invention, the terms "identical", "equal" and the like do not mean that the two values are absolutely equal, but rather allow for some reasonable error, that is, the terms also encompass "substantially identical", "substantially equal". By analogy, in the present invention, the term "perpendicular", "parallel" and the like in the table direction also covers the meaning of "substantially perpendicular", "substantially parallel".

In order to improve the power density of the converter and ensure maintainability and heat dissipation performance of the converter, the invention provides the converter, which is divided into three cavities, and independent heat dissipation structures are arranged in the cavities, so that each device has good heat dissipation environment and high heat dissipation efficiency. In addition, each device and module are arranged in different chambers according to functions of the converter, and a double parallel structure is preferably adopted at the direct current side, namely two groups of power modules, capacitance filtering modules and reactor components are arranged in the power cabinet, and two groups of direct current protection modules are arranged in the grid-connected control cabinet. Meanwhile, the grid-connected control cabinet and the power cabinet adopt a back-to-back mode, the electric connection bus path is shortest, and particularly for double parallel circuits, the current sharing is good and the cost is low. The embodiments of the present invention will be further described with reference to the accompanying drawings.

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

The grid-connected control cabinet comprises a first cavity 101, and 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 invention, as shown in fig. 2, in which the control module 113 is arranged on one side of the first cavity with respect to the vertical partition 001, the dc protection module 111 is arranged between the control module 113 and the vertical partition 001, and the ac protection module 112 is arranged below the dc protection module 111. In order to facilitate operation and maintenance, in one embodiment of the present invention, the control module 113 is disposed on a mechanical mounting frame, and the mechanical mounting frame is disposed on one side of the first cavity opposite to the vertical partition 001 and is openable and closable, so that on one hand, maintenance and control operations are facilitated, and on the other hand, the dc protector module 111 disposed at the rear of the mechanical mounting frame is protected. In one embodiment of the present invention, the first heat dissipation module 114 is disposed at the top of the first cavity, blows downward, forms a circulation duct in the first cavity, and dissipates heat of one or more components disposed in the first cavity, and in one embodiment of the present invention, the first heat dissipation module includes a first heat dissipation fan and a heat exchanger. In an embodiment of the present invention, the ac protection module 112 and the dc protection module 11 may be electrical devices with circuit protection functions, such as a circuit breaker, a disconnecting switch, or a contactor, and the specific structure thereof is a structure commonly used in the art and will not be described herein.

In order to better implement the current transformation, in one embodiment of the present invention, a dc pre-charging module 115, an ac pre-charging module 116 and an ac filtering module 117 are further disposed in the first cavity, where the dc pre-charging module 115 is disposed adjacent to the dc protection module 111, and is preferably disposed on an upper side of the dc protection module for facilitating a dc in-out line connection, and the ac pre-charging module 116 and the ac filtering module 117 are disposed adjacent to the ac protection module 112, and in order to facilitate an ac in-out line connection, the ac filtering module 117 is preferably disposed on two sides of the ac protection module 112, and in one embodiment of the present invention, the ac pre-charging module 116 and the dc pre-charging module 115 share a resistor, and therefore, the ac pre-charging module 116 is preferably disposed on a side of the dc protection module 111.

In order to connect with the external battery pack and the box transformer unit, in the embodiment of the 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 transformer unit through the external interface 118. In one embodiment of the present invention, the dc side of the converter is connected to the outside by a cable, and is internally converted into an incoming copper bar, specifically, the external interface is connected to the dc protection module by an incoming copper bar and is connected to the external battery pack by a cable, and the dc protection module 111 may 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 is connected to an external box transformer unit after being converted into a cable through the external interface 118. It should be understood that in other embodiments of the present invention, the external interface may be electrically connected to the dc protection module and/or the ac protection module by a cable or other means, and the external interface may be electrically connected to the external battery pack and the box transformer unit by other electrical connection means commonly used in the art. In order to avoid lightning damage, in one embodiment of the present invention, the converter further includes an ac lightning protection module 119 and a dc lightning protection module 1110, where the ac lightning protection module 119 is disposed at the bottom of the first cavity 101, so as to facilitate connection from the outgoing 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 the connection from the incoming copper bar of the dc protection module 111.

The power cabinet 200 and the grid-connected control cabinet 100 are in back-to-back mode, and the devices and/or modules in the power cabinet 200 and the grid-connected control cabinet 100 can be electrically connected in a copper bar or cable mode, so that on one hand, the electrical connection bus path is shortest, and on the other hand, the front-to-back maintenance mode of the converter can be realized, that is, 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 the front side, and one side of the power cabinet 200 is regarded as the back side, the devices in the power cabinet 200 are maintained from the back side, and the devices in the grid-connected control cabinet 100 are maintained from the front side. The term "back-to-back connection" refers to that the side of the power cabinet, which can lead out the lead at the shortest distance, i.e. the first side of the power cabinet, the side of the grid-connected control cabinet, which can lead out the lead at the shortest distance, and the second side of the grid-connected control cabinet are in contact with each other.

The interior of the power cabinet is divided into a second cavity 201 and a third cavity 202 by a transverse partition 002, wherein the second cavity 201 comprises a first portion of the first face of the power cabinet, and the third cavity 202 comprises a second portion of the first face of the power cabinet, preferably the second cavity 201 is located below the third cavity 202. The second cavity 201 is internally provided with a reactor assembly 211 and a second heat dissipation module 212, and the third cavity is internally provided with a power module 221, a capacitive filter module 222 and a third heat dissipation module 223. The capacitor filter 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 bars of the dc protection module 111 pass through the vertical partition 001 and are connected with the capacitive filtering module 222, the capacitive filtering module 222 is connected with the power module 221 in the third cavity by using screws, the outgoing copper bars of the power module 221 pass through the horizontal partition 002 and are connected with the reactor assembly 211 in the second cavity 201, and the outgoing copper bars of the reactor assembly 211 pass through the vertical partition 001 and are connected with the ac protection module 112 in the first cavity 101. The ac protection module 112 and the dc protection module 111 correspond to the positions of the second cavity and the third cavity, respectively, so as to ensure that the path of the main bus electrical appliance is shortest.

The reactor assembly 211 is arranged inside the second cavity located below, mainly for the following insight of the inventors: the volume and the weight of reactor subassembly 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 horizontal baffle 002, the cooperation sets up in the second heat dissipation module 212 at second cavity top, can make the inside self-loopa inside wind channel of formation of second cavity, dispel the heat to one or more parts of arranging in the second cavity, and then avoid the reactor heat to produce the influence to power module. In one embodiment of the present invention, the second heat dissipation module is disposed at a 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 one 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, and in one embodiment of the present invention, the third heat dissipation module includes a third heat dissipation fan and a heat exchanger.

In order to improve the power density, in an embodiment of the present invention, the dc side of the converter adopts a double parallel scheme, that is, the power cabinet 200 includes two groups of power modules 221, a capacitive filter module 222 and a reactor component 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 of the ac side and dc side loops of the current transformer, in one embodiment of the invention, the current transformer further comprises an electromagnetic interference EM I module comprising 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 whole machine volume, and can meet the requirement of high power density. The bus is connected back to back, the bus connection path is shortest, and particularly for a double parallel circuit, 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 placed on the front side of the whole machine, and the operation is convenient. In addition, each cavity adopts independent heat dissipation module, and the device requirement in the different cavities is aimed at, independently sets up the heat dissipation of each cavity, and then guarantees that ambient temperature satisfies the rated operating temperature of different devices, and 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 those skilled in the relevant art that various combinations, modifications, and variations can be made therein without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention as 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.

Claims

1. The utility model provides a current transformer, its characterized in that, direct current side adopts two parallelly connected schemes, includes two sets of power module, electric capacity filter module, reactor subassembly and direct current protection module at least, just the current transformer includes:

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

the power cabinet, the first face of power cabinet with the second face of grid-connected control cabinet contacts each other, wherein first face is the face that can draw forth the wire with the shortest wiring distance of power cabinet, and the second face is the face that can draw forth the wire with the shortest wiring distance of grid-connected control cabinet, just the inside of power cabinet is divided into through horizontal baffle:

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 filter 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 of claim 1 wherein the first heat dissipating module comprises a first heat dissipating fan and a heat exchanger, the first heat dissipating module being disposed on top of the first cavity; and/or

3. The converter of claim 1 wherein said capacitive filter module is electrically connected to said dc protection module and to a power module, and wherein said power module is electrically connected to said reactor assembly, and wherein said reactor assembly is electrically connected to said ac protection module.

4. The converter of claim 1, wherein 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 and the alternating current protection module are connected with the external interface through copper bars, and the external interface is connected to an external battery pack and a box transformer unit through cables.

5. The converter of claim 1 wherein the ac protection module and the dc protection module comprise electrical devices having circuit protection functions.

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

7. The converter of claim 4, 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.

8. 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 electric connecting piece of the alternating-current protection module and the reactor component.