CN114268128A - Electrical cabinet for motor control - Google Patents

Electrical cabinet for motor control Download PDF

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Publication number
CN114268128A
CN114268128A CN202111560858.XA CN202111560858A CN114268128A CN 114268128 A CN114268128 A CN 114268128A CN 202111560858 A CN202111560858 A CN 202111560858A CN 114268128 A CN114268128 A CN 114268128A
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CN
China
Prior art keywords
electrical cabinet
conductor
contactor
circuit breaker
electrically connected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111560858.XA
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Chinese (zh)
Inventor
龚金云
邓承宇
郭钦鑫
牛瑞根
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Envision Energy Co Ltd
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Envision Energy Co Ltd
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Publication date
Application filed by Envision Energy Co Ltd filed Critical Envision Energy Co Ltd
Priority to CN202111560858.XA priority Critical patent/CN114268128A/en
Publication of CN114268128A publication Critical patent/CN114268128A/en
Pending legal-status Critical Current

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy

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Abstract

The invention discloses an electrical cabinet for motor control, which adopts a multi-parallel structure layout and comprises a main fuse, at least two circuit breakers and at least two contactors. Wherein the first end of the main fuse is electrically connected to the power conversion device, and the second end thereof is electrically connected to the second end of the circuit breaker through the first conductor. The circuit breakers are in a parallel structure, and a first end of each circuit breaker is electrically connected to a power grid through a second conductor, and a second end of each circuit breaker is electrically connected to a second end of the contactor through a third conductor. The contactors are also in a parallel configuration, and a first end of each contactor is electrically connected to the generator stator by a fourth conductor.

Description

Electrical cabinet for motor control
Technical Field
The invention relates to the technical field of power electronics, in particular to an electrical cabinet for motor control.
Background
The electrical cabinet is usually a closed or semi-closed metal cabinet, and is used for meeting the requirement of normal operation of an electrical power system, and a switch device, a measuring instrument, a protective electrical device, an auxiliary device and the like are usually assembled in the electrical cabinet according to the requirement of electrical wiring. In the technical field of wind power generation and the like, it is generally required to connect an electrical cabinet between a generator and a mains line, to control the synchronization of the power output of the generator to the mains line (i.e. the input of the generated electrical energy to the grid) so as to supply power to an electrical consumer, and to disconnect the power connection of the generator to the mains line.
The existing electrical cabinet for motor control is generally formed by combining a plurality of cabinet bodies such as a grid-connected cabinet, a control cabinet, a power cabinet and the like. In the field application process, the device is limited by the size of the arrangement space, and the problems of inconvenient transportation, difficult installation and difficult operation and maintenance are often encountered. In addition, the existing grid-connected cabinet mostly adopts a structure that a single main breaker is connected with a contactor, and the contactor may be a single contactor or a parallel contactor structure. This results in a lower power density and a relatively higher cost. Generally, the existing electrical cabinet has a complex structure and a low modularization rate.
Disclosure of Invention
Aiming at solving part or all problems in the prior art, the invention provides an electrical cabinet for motor control, which adopts a multi-parallel structure layout and comprises:
a main fuse having a first end electrically connected to the power conversion device and a second end electrically connected to a second end of the circuit breaker through a first conductor;
at least two circuit breakers connected in parallel and having first ends electrically connected to the grid through a second conductor and second ends electrically connected to the second end of the contactor through a third conductor;
at least two contactors connected in parallel and having first ends electrically connected to the generator stator by fourth conductors.
Further, the number of one or more of the main fuse, the circuit breaker, and the contactor is an even number.
Furthermore, the at least two circuit breakers are symmetrically arranged along the central axis of the electrical cabinet, and one side, close to any two circuit breakers, is a surface on which a wire can be led out at the shortest wiring distance.
Further, the at least two contactors are symmetrically arranged along a central axis of the electrical cabinet, and one side, close to any two contactors, is a surface on which a wire can be led out at the shortest wiring distance.
Further, the first and/or second and/or third and/or fourth conductors comprise one or more of: copper bar, aluminium bar and cable.
Further, the first conductor, the second conductor, the third conductor and the fourth conductor are respectively arranged symmetrically along a central axis of the electrical cabinet.
Further, the first conductor, the second conductor, the third conductor, and the fourth conductor are connected to the contactor, the breaker, and the main fuse at the shortest wiring distance.
Further, the electrical cabinet further comprises a breaker mounting beam, wherein the breaker is arranged above the breaker mounting beam and is fixed through a breaker mounting plate.
Further, the electrical cabinet further comprises a contactor mounting beam, and the contactor is arranged above the contactor mounting beam and fixed through a contactor mounting plate.
Further, at least three surfaces of the electrical cabinet are of an openable and closable design.
The electrical cabinet for motor control provided by the invention adopts a structural design of multi-parallel structural layout of the circuit breaker and the contactor, and the modularization degree is high. Meanwhile, the circuit breaker and the contactor are installed back to back, and the connecting conductors among the modules are connected to the corresponding modules at the shortest wiring distance, so that the path of the connecting bus is shortest, and the electrical cabinet is compact in overall structure, small in size, low in cost, high in power density and convenient to transport, install and maintain. In addition, the circuit breaker, the contactor and the connecting conductor are also symmetrically arranged relative to the central axis of the electric appliance cabinet, namely, the main electrical structure inside the electric cabinet is completely centrosymmetric, and current sharing can be realized. Meanwhile, at least three openable and closable surfaces are designed on the electric cabinet, so that three-surface maintenance can be realized on the electric cabinet, and the electric cabinet is high in maintainability, operability and visibility.
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 diagram of an equivalent circuit structure of an electrical cabinet for motor control according to an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of an electrical cabinet for motor control according to an embodiment of the present invention;
FIG. 3 illustrates a left side view schematic of an electrical cabinet for motor control in accordance with an embodiment of the present invention; and
fig. 4 shows a front view schematic of an electrical cabinet for motor control according to an embodiment of the present 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".
Aiming at the problems of low power density and the like of the existing grid-connected cabinet, the invention provides an electrical cabinet for motor control, which adopts the structural design of the multi-parallel structural layout of a circuit breaker and a contactor and has high modularization degree. Meanwhile, the path of the connecting bus is shortest through back-to-back mounting and other layout modes, so that the electrical cabinet is compact in overall structure, and the purposes of reducing the size of the cabinet body and improving the power density are achieved.
Specifically, the electrical cabinet for motor control in the embodiment of the invention comprises a main fuse, a circuit breaker and a contactor. The number of the main fuses can be set to be one or more according to the power of the electrical cabinet. The circuit breaker is a plurality of, and its one end is connected to the electric wire netting, just a plurality of circuit breakers adopt parallel structure. The contactors 30 are plural, one end of each contactor is connected to the stator side of the generator, and the contactors are connected in parallel. Furthermore, in embodiments of the present invention, the number of one or more of the main fuse, the circuit breaker and the contactor is even, for example, the electrical cabinet may include one main fuse, two circuit breakers, two contactors, or one main fuse, two circuit breakers, three contactors, or two main fuses, five circuit breakers, two contactors, and the like.
Fig. 1 shows a schematic diagram of an equivalent circuit structure of an electrical cabinet for motor control according to an embodiment of the present invention. In the embodiment shown in fig. 1, the electrical cabinet includes a main fuse 50, two breakers 40, and two contactors 30, and the connection relationship among the main fuse, the breakers, and the contactors includes:
a first end of the main fuse 50 is electrically connected to the power conversion device, and a second end is connected to a second end of the contactor 30;
a first end of the circuit breaker 40 is electrically connected to a power grid, and a second end thereof is electrically connected with a second end of the contactor 30; and
a first end of the contactor 30 is electrically connected to the generator stator side.
In other embodiments of the present invention, the electrical cabinet may contain different numbers of main fuses and/or circuit breakers and/or contactors, but the connection relationship between the main fuses, the circuit breakers and the contactors is substantially the same as the embodiment shown in fig. 1.
In order to improve the current equalizing effect, in the embodiment of the invention, each module and/or device inside the electrical cabinet are symmetrically arranged along the central axis of the electrical cabinet. Specifically, the circuit breakers, the contactors, the connection conductors between the circuit breakers and the contactors, and the external connection conductors thereof are all symmetrically arranged along the central axis of the electrical cabinet.
In addition, in order to improve the compactness of the overall structure of the electrical cabinet, in the embodiment of the invention, a back-to-back mounting mode is adopted among a plurality of circuit breakers and a plurality of contactors in the electrical cabinet, and each connecting conductor is connected to a corresponding module or device in the shortest wiring distance. Wherein, the back-to-back mounting mode is as follows: the side through which the circuit breaker or contactor can be led out the lead wire at the shortest distance, i.e., the second side of the circuit breaker or contactor, and the second sides of the other circuit breakers or contactors are in contact with each other.
The following describes the internal structure of the electrical cabinet in detail with reference to the drawings of the embodiments. Fig. 2 to 4 respectively show a schematic structural diagram, a left side view and a front view of an electrical cabinet for motor control according to an embodiment of the present invention. It should be understood that in the embodiments shown in fig. 2 to 4, the electrical cabinet includes one main fuse, two circuit breakers, and two contactors, and in other embodiments of the present invention, when the electrical cabinet includes different numbers of main fuses and/or circuit breakers and/or contactors, the layout of each module or device therein may be adjusted according to the layout manner of the embodiments shown in fig. 2 to 4.
As shown in fig. 2 to 4, an electrical cabinet for motor control includes a main frame 10, a main fuse 50, a circuit breaker 40, a contactor 30, and a connection conductor between modules. The main fuse 50, the disconnector 40, the contactor 30, and the connection conductors between the modules are disposed inside the main frame 10.
The main frame 10 is made of a profile and is provided with a plurality of standard mounting beams 105, a breaker mounting cross-beam 103 and a contactor mounting cross-beam 101. The circuit breaker mounting beam 103 is used for mounting a circuit breaker, the contactor mounting beam 101 is used for mounting a contactor, and the standard mounting beam 105 is used for mounting other modules or devices of the electrical cabinet. Meanwhile, since the standard mounting beam 105, the breaker mounting beam 103 and the contactor mounting beam 101 are generally disposed between two columns of the main frame 10, they can also play a certain supporting role, enhancing the overall strength of the main frame 10.
The first end of the main frame 10 is provided with a box transformer incoming line 60, which is connected to the power grid and to the inside of the electrical cabinet through a fifth conductor 206, and the second end of the main frame 10 is provided with a stator side incoming line 70, which is connected to the stator side of the generator and to the inside of the electrical cabinet through a sixth conductor 201. In the illustrated embodiment, the fifth conductor 206 and the sixth conductor 201 are copper bars, but it should be understood that in other embodiments of the present invention, the fifth conductor 206 and the sixth conductor 201 may also be aluminum bars, cables, or other connecting conductors, or a plurality of connecting conductors may be used in combination. In order to ensure the current equalizing effect, in the present invention, the fifth conductor 206 and the sixth conductor 201 are symmetrically arranged along the central axis of the electrical cabinet.
The circuit breaker 40 is arranged on one side of the electrical cabinet inside, which is close to the box transformer incoming line 60. The circuit breaker 40 is mounted on a circuit breaker mounting plate 104, and the circuit breaker mounting plate 104 is further connected to the main frame 10 through the circuit breaker mounting beam 103. The circuit breaker 40 is connected on one side to the fifth conductor 206 via a second conductor 205 and thus to the grid, and on the other side to the contactor 30 via a third conductor 203. In the illustrated embodiment, the second conductor 205 and the third conductor 203 are in a copper bar structure, and it should be understood that in other embodiments of the present invention, the second conductor 205 and the third conductor 203 may also be in other connection conductors such as aluminum bars, cables, and the like, or in combination with a plurality of connection conductors. In the illustrated embodiment, the number of the circuit breakers 40 is two, the two circuit breakers 40 are symmetrically arranged along the central axis of the electrical cabinet, and a back-to-back mounting manner is adopted, that is, one side of the two circuit breakers, which is close to the two circuit breakers, is a surface on which a wire can be led out at the shortest wiring distance. Furthermore, as shown, the second conductor 205 is fixed to the standard mounting beam 105 and is also arranged symmetrically along the center axis of the electrical cabinet. The third conductor 203 is arranged along the center axis of the electrical cabinet, connecting the circuit breaker 40 and the contactor 30. It should be understood that, in other embodiments of the present invention, when the electrical cabinet includes more than 2 circuit breakers, the installation positions of the circuit breakers, the second conductor and the third conductor may be slightly adjusted, but preferably need to be symmetrically arranged along the central axis of the electrical cabinet to ensure the current sharing effect, and meanwhile, the shortest wiring path should be adopted as far as possible to set the relative positions between the circuit breakers and the second conductor and between the circuit breakers and the third conductor to enhance the compactness of the structure and improve the power density.
The contactor 30 is arranged at one side of the electrical cabinet close to the stator side incoming line 70. The contactor 30 is mounted on a contactor mounting plate 102, and the circuit breaker mounting plate 102 is further connected to the main frame 10 by the contactor mounting cross member 101. One side of the contactor 30 is connected to the sixth conductor 201 through a fourth conductor 202 and further connected to the generator stator side, and the other side is connected to the breaker 40 through a third conductor 203. In the embodiment shown in the figures, the fourth conductor 202 is in a copper bar structure, and it should be understood that in other embodiments of the present invention, the fourth conductor 202 may also be in other connection conductors such as an aluminum bar, a cable, etc., or in combination with a plurality of connection conductors. In the embodiment shown in the figure, there are two contactors 30, and the two contactors 30 are symmetrically arranged along the central axis of the electrical cabinet, and a back-to-back mounting manner is adopted, that is, one side of the two contactors close to each other is a surface on which a wire can be led out at the shortest wiring distance. Furthermore, as shown, the fourth conductor 205 is fixed to the standard mounting beam 105, and is also arranged symmetrically along the center axis of the electrical cabinet. It should be understood that, in other embodiments of the present invention, when the electrical cabinet includes more than 2 contactors, the installation positions of the contactors and the fourth conductor may be slightly adjusted, but preferably need to be symmetrically arranged along the central axis of the electrical cabinet to ensure the current equalizing effect, and meanwhile, the shortest wiring path should be adopted as much as possible to set the relative positions between the contactor and the contactor, and between the contactor and the third conductor and the fourth conductor, so as to enhance the compactness of the structure and improve the power density.
The main fuse 50 is disposed between the disconnector 40 and the contactor 30, is connected to the standard mounting beam 105, and is further provided with an insulating mounting block 106 between the main fuse 50 and the standard mounting beam 105. The main fuse 50 is connected to the contactor 30 and the disconnector 40 on one side by a first conductor 204 and to a power conversion device outside the cabinet on the other side. In one embodiment of the present invention, the first conductor 204 and the main fuse are connected using the shortest wiring path.
In order to facilitate maintenance, in one embodiment of the invention, the electrical cabinet adopts a three-surface maintenance mode, specifically, at least three surfaces of the electrical cabinet are designed to be openable and closable, and the electrical cabinet is high in maintainability, operability and visibility.
Based on the electrical cabinet, when the frequency converter is in sub-synchronization, the frequency converter on the side of the power grid works in a rectification state, the frequency converter on the side of the motor works in an inversion state, part of energy flows from the power grid to the rotor of the doubly-fed generator, and the path of the energy on the electrical cabinet is as follows: the box transformer substation incoming line 60, the fifth conductor 206, the second conductor 205, the circuit breaker 40, the first conductor 204, the main fuse 50 and the motor rotor are connected in sequence, and the bus voltage is always kept stable; the other part flows from the stator side of the generator to the power grid, and the path of the other part at the electric cabinet is as follows: stator side incoming line 70-sixth conductor 201-fourth conductor 202-contactor 30-third conductor 203-breaker 40-second conductor 205-fifth conductor 206-the grid.
When the frequency converter is in the supersynchronization, the frequency converter at the side of the power grid works in an inversion state, the frequency converter at the side of the motor works in a rectification state, one part of energy flows to the power grid from a rotor of the doubly-fed generator, and the path of the energy at the electric cabinet is as follows: motor rotor-main fuse 50-third conductor 203-circuit breaker 40-second conductor 205-fifth conductor 206-box transformer substation incoming line 60; the other part also flows from the stator side to the power grid, and the path of the other part in the electrical cabinet is as follows: stator side incoming line 70-sixth conductor 201-fourth conductor 202-contactor 30-third conductor 203-breaker 40-second conductor 205-fifth conductor 206-the grid. The path of energy flowing from the stator side to the power grid is divided into two paths which are connected in parallel to enter the power grid.
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.

Claims (10)

1. The utility model provides an regulator cubicle for motor control which characterized in that adopts many parallel structure overall arrangement, includes:
a main fuse having a first end electrically connected to the power conversion device and a second end electrically connected to a second end of the circuit breaker through a first conductor;
at least two circuit breakers connected in parallel and having first ends electrically connected to the grid through a second conductor and second ends electrically connected to the second end of the contactor through a third conductor; and
at least two contactors connected in parallel and having first ends electrically connected to the generator stator by fourth conductors.
2. The electrical cabinet of claim 1, wherein one or more of the main fuse, circuit breaker, and contactor are an even number.
3. The electrical cabinet according to claim 1, wherein the at least two circuit breakers are symmetrically arranged along a central axis of the electrical cabinet, and a side of any two circuit breakers close to the at least two circuit breakers is a surface on which a wire can be led out at a shortest wiring distance.
4. The electrical cabinet according to claim 1, wherein the at least two contactors are symmetrically arranged along a central axis of the electrical cabinet, and a side of any two contactors close to each other is a surface on which a wire can be led out at a shortest wiring distance.
5. The electrical cabinet of claim 1, wherein the first and/or second and/or third and/or fourth conductors comprise one or more of: copper bar, aluminium bar and cable.
6. The electrical cabinet of claim 1, wherein the first, second, third, and fourth conductors are connected to the contactor, circuit breaker, and main fuse at a shortest routing distance.
7. The electrical cabinet of claim 1, wherein the second conductor, the third conductor, and the fourth conductor are each symmetrically disposed along a central axis of the electrical cabinet.
8. The electrical cabinet of claim 1, further comprising a circuit breaker mounting beam, the circuit breaker disposed above the circuit breaker mounting beam and secured by a circuit breaker mounting plate.
9. The electrical cabinet of claim 1, further comprising a contactor mounting beam over which the contactor is disposed and secured by a contactor mounting plate.
10. The electrical cabinet of claim 1, wherein at least three sides of the electrical cabinet are of an openable and closable design.
CN202111560858.XA 2021-12-20 2021-12-20 Electrical cabinet for motor control Pending CN114268128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111560858.XA CN114268128A (en) 2021-12-20 2021-12-20 Electrical cabinet for motor control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111560858.XA CN114268128A (en) 2021-12-20 2021-12-20 Electrical cabinet for motor control

Publications (1)

Publication Number Publication Date
CN114268128A true CN114268128A (en) 2022-04-01

Family

ID=80828015

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111560858.XA Pending CN114268128A (en) 2021-12-20 2021-12-20 Electrical cabinet for motor control

Country Status (1)

Country Link
CN (1) CN114268128A (en)

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