CN113346509A

CN113346509A - SVG power unit with universal structure

Info

Publication number: CN113346509A
Application number: CN202010135889.XA
Authority: CN
Inventors: 张中胜; 盛晓东; 于海波; 刘国伟
Original assignee: NR Electric Co Ltd; NR Engineering Co Ltd
Current assignee: NR Electric Co Ltd; NR Engineering Co Ltd
Priority date: 2020-03-02
Filing date: 2020-03-02
Publication date: 2021-09-03

Abstract

The invention discloses an SVG power unit with a universal structure, which is a core component of an SVG system. The SVG power unit comprises a front panel, an alternating current incoming line copper bar, a vacuum contactor, an alternating current outgoing line copper bar, an IGBT, a radiator, a square resistor, a control board card assembly, a bottom plate, a laminated busbar, a capacitor and a capacitor supporting plate. The vacuum contactor is located in the front of the power unit main body, the vacuum circuit breaker can be used as an optional part, the IGBT and the square resistor are fixed on the surface of the radiator, the alternating current incoming line copper bar and the alternating current outgoing line copper bar are respectively led out from different IGBTs, the capacitor is located on the rear side of the power unit, the laminated busbar realizes the electrical connection between the capacitor and the IGBT, and the control panel card assembly is flatly laid on the upper portion of the IGBT. The power unit has compact structure, can form power units with various capacities according to the specification quantity and the capacitance quantity of the IGBT, has strong structural universality, and is convenient for modular assembly and transportation.

Description

SVG power unit with universal structure

Technical Field

The invention relates to an SVG power unit with a universal structure. The SVG system has the effect of dynamic reactive power compensation and has an obvious effect of improving the quality of a power grid.

Background

SVG (static Var generator) is called as a static Var generator, and the SVG adopts a self-commutation bridge circuit formed by turn-off power electronic devices (IGBT), is connected in parallel to a power grid through a reactor, and properly adjusts the amplitude and phase of output voltage at the alternating current side of the bridge circuit or directly controls the current at the alternating current side of the bridge circuit. The reactive power required by the system is quickly absorbed or sent out, and the purpose of quickly and dynamically adjusting the reactive power is achieved. As an active type compensator, it is possible to track not only the surge current of the surge load but also the harmonic current.

At present, SVG is applied to various industries such as coal mines, subways, power plants and the like, and great economic benefits are generated. Meanwhile, the SVG power unit with the universal structure has different capacity requirements and various types in different projects, and has obvious practical significance in product production and maintenance. Simultaneously, the field engineering is comparatively complicated to individual application, and in order to avoid single SVG power unit to damage and then influence the operation of whole SVG system, power unit's redundant design just seems very necessary, through increase vacuum circuit breaker on the SVG power unit, can carry out electric bypass with the SVG power unit of damage in service, guarantee the whole operation of SVG system.

Disclosure of Invention

The invention aims to provide an SVG power unit with a universal structure, which is compact in structure, can form power units with various capacities according to the specification and quantity of IGBT and the quantity of capacitors, is strong in structural universality and is convenient for modular assembly and transportation. The SVG power unit is a core component of the SVG system.

This user characteristic and advantage of the present disclosure will become apparent from the detailed description below or may be learned in part by practice of the present disclosure.

According to the application, a structure general type SVG power unit is provided, which is characterized by comprising:

a base plate;

the IGBT assembly is fixed on the surface of the bottom plate;

the capacitor assembly is fixed on the surface of the bottom plate;

the laminated busbar is fixed on the surface of the bottom plate, arranged between the IGBT assembly and the capacitor assembly, and electrically connected with the capacitor assembly through the laminated busbar;

and the control board card assembly is arranged on the upper part of the IGBT assembly.

According to some embodiments, the IGBT component comprises: the IGBT heat sink comprises a heat sink, a plurality of IGBTs and a square resistor, wherein the IGBTs and the square resistor are fixed on the surface of the heat sink.

According to some embodiments, the capacitor assembly includes a plurality of capacitors and a capacitor support plate, the capacitor support plate being fixed to the base plate, the capacitor support plate being used for fixing the plurality of capacitors.

According to some embodiments, the control board card assembly comprises a sub-power unit control board, a drive board, a power board, and a control board card housing, wherein the sub-power unit control board, the drive board, and the power board are fixed on the control board card housing.

According to some embodiments, the structural universal SVG power unit further comprises a front panel secured to the side of the chassis.

According to some embodiments, the structural universal SVG power sheet further comprises a vacuum contactor fixed to the front panel surface.

According to some embodiments, the IGBT component further comprises an ac incoming line copper bar and an ac outgoing line copper bar connected to the IGBT component, and the ac incoming line copper bar and the ac outgoing line copper bar penetrate out of the front panel.

According to some embodiments, the laminated busbar shape is a three-fold zigzag structure.

According to some embodiments, the heat sink has a water inlet and a water outlet, the water inlet and the water outlet being disposed at two ends of the same side of the heat sink.

According to some embodiments, the laminated busbar comprises a busbar positive electrode, a busbar negative electrode and an insulating film, wherein the busbar negative electrode is arranged between the busbar positive electrode and the insulating film.

According to some embodiments, the plurality of IGBTs and the square resistor have a thermally conductive silicone grease disposed on the plurality of IGBTs and the square resistor mounting surface.

According to a second aspect of the present application, an electrical apparatus is provided, characterized in that it comprises an electrical structure according to any one of claims 1-11.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application.

Fig. 1 shows an axial perspective view of a power cell according to an exemplary embodiment of the present application.

Fig. 2 shows a schematic diagram of a front side of a power cell according to an example embodiment of the present application.

Fig. 3 shows a schematic diagram of a power cell with the vacuum contactor and front panel removed from the front according to an example embodiment of the present application.

Fig. 4 shows an axial perspective view of an IGBT assembly according to an example embodiment of the application.

Fig. 5 shows a power cell capacitive assembly schematic according to an example embodiment of the present application.

Fig. 6 shows a schematic diagram of a busbar according to an example embodiment of the present application.

Fig. 7 shows a schematic diagram of a power unit control board assembly according to an example embodiment of the present application.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first component discussed below may be termed a second component without departing from the teachings of the present concepts. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Those skilled in the art will appreciate that the drawings are merely schematic representations of exemplary embodiments, which may not be to scale. The blocks or flows in the drawings are not necessarily required to practice the present application and therefore should not be used to limit the scope of the present application.

The technical solution of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, 2 and 3, the flexible-direct-current power unit includes a front panel 101, an ac incoming copper bar 102, a vacuum contactor 103, an ac outgoing copper bar 104, a control board card housing 105, a plurality of IGBTs 201, a heat sink 202, a square resistor 203, a control board card assembly 204, a bottom board 301, a laminated busbar 302, a capacitor 303 and a capacitor support board 304.

According to an example embodiment, the plurality of IGBTs 201, the heat sink 202 and the sheet resistor 203 form an IGBT assembly, the IGBT assembly is fixed to a base plate, the capacitor 303 and the capacitor support plate 304 form a capacitor assembly, the capacitor assembly is fixed to the base plate, the laminated busbar is also fixed to the base plate, the laminated busbar is arranged between the IGBT assembly and the capacitor assembly, the IGBT assembly, the capacitor assembly and the laminated busbar are located side by side on the surface of the base plate, and the IGBT assembly is electrically connected with the capacitor assembly through the laminated busbar 302.

According to an exemplary embodiment, the SVG power unit with a universal structure further comprises a front panel, the front panel is fixed on the side of the bottom plate, the vacuum contactor 103 is located in the front of the power unit and fixed on the front panel, and in practical application, the vacuum contactor 103 can be selected and installed according to specific product performance requirements and economic requirements.

According to an example embodiment, the IGBT component further includes an ac incoming line copper bar and an ac outgoing line copper bar connected to the different IGBT crimping components, and the ac incoming line copper bar and the ac outgoing line copper bar are used for being connected to the outside.

Referring to fig. 4, the IGBT assembly includes a plurality of IGBTs 201, a heat sink 202, and a sheet resistor 203, the plurality of IGBTs 201 and the sheet resistor 203 are fixed on a surface of the heat sink, and a mounting surface of the plurality of IGBTs and the sheet resistor and the heat sink has a heat conductive silicone grease for heat dissipation of the plurality of IGBTs and the sheet resistor. The radiator is provided with a water inlet and a water outlet, the water inlet and the water outlet are arranged at two ends of the same side of the heat dissipation device, the radiator is water-cooled, and the water inlet and the water outlet are used for cooling water circulation of the radiator.

According to example embodiments, the capacity requirements of different projects may be met by adjusting the number and specifications of IGBTs.

According to an example embodiment, the IGBT component further comprises an ac incoming copper bar and an ac outgoing copper bar connected to the different IGBTs 201.

Referring to fig. 5, the capacitor assembly includes a capacitor 303 and a capacitor support plate 304, the capacitor support plate 304 is fixed to the capacitor 303 and the bottom plate 301 respectively, for fixing the capacitor 303 through the capacitor support plate 304 and the bottom plate 301, and positioning and mounting of the plurality of capacitors 303 are achieved through cooperation of the capacitor support plate 304 and the capacitor 303.

According to example embodiments, the capacity requirements of different projects may be met by adjusting the number and value of the capacitors.

Referring to fig. 6, the shape is a special-shaped 3-fold structure, the laminated busbar is provided with a busbar positive electrode, a busbar negative electrode and an insulating film, and the busbar negative electrode is arranged between the busbar positive electrode and the insulating film.

According to an example embodiment, the laminated busbar is formed through a special hot pressing process and a bending process, and has long-term high-current flow capacity and insulating capacity.

According to an example embodiment, the laminated busbar is of a three-folded zigzag structure, one end of the structure is conveniently connected with the IGBT assembly, the other end of the structure is connected with the capacitor assembly, and meanwhile the structure can be fixedly connected with the bottom plate.

Referring to fig. 7, the control board card assembly includes a power board 501, a driving board 502, a sub-power unit control board 503, and a control board card housing 504,

according to an exemplary embodiment, the power board 501, the driver board 502, and the sub power unit control board 503 are fixed to the control board card housing 504.

According to an exemplary embodiment, the power unit is installed by first fixing a plurality of IGBTs 201 and sheet resistors 203 to the surface of a heat sink 202 by screws, wherein before installation, a thermal silicone grease is coated on the installation surface of the IGBTs 201 and sheet resistors 203, and the installation of the IGBT components is completed. Then, the sub-power unit control board, the drive board and the power board are fixed on the control board card shell until the control board card assembly 204 is assembled. The IGBT assembly, the control board assembly 204, and the sheet metal parts of the power cell are then secured together to form the front assembly of the power cell. Then, the capacitor 303, the bottom plate 301 and the capacitor support plate 304 are fixed together to form a capacitor assembly; then, the capacitor assembly and the front assembly of the power unit are fixed together to form a main assembly of the power unit, and the vacuum contactor 103 is fixed into the main assembly of the power unit, thereby completing the structural installation of the power unit. And finally, completing the connection of the power internal driving wire, the power taking wire and the testing wire, and finishing the assembly work of the whole SVG power unit.

According to the embodiment of the example, the SVG power units with different capacities can be formed by adjusting the number and the specification of the IGBTs and adjusting the number and the capacity value of the capacitors, the structural parts are completely the same, great help is brought to cost reduction and stock preparation, the whole power unit is compact in structure, convenient to assemble, convenient to prepare and transport, high in applicability and capable of improving product competitiveness. In the actual use process, the SVG power unit can be transported to a project site along with other electric equipment, and can also be independently delivered to the site.

According to some embodiments of the present application, there is also provided an electrical device, which can configure an electrical structure according to embodiments of the present application, and details are not repeated herein.

It should be noted that each of the embodiments described above with reference to the drawings is only for illustrating the present application and not for limiting the scope of the present application, and those skilled in the art should understand that modifications or equivalent substitutions made on the present application without departing from the spirit and scope of the present application should be covered by the present application. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.

Claims

1. The utility model provides a structure general type SVG power unit which characterized in that includes:

a base plate;

the IGBT assembly is fixed on the surface of the bottom plate;

the capacitor assembly is fixed on the surface of the bottom plate;

2. The SVG power unit of claim 1, wherein said IGBT component comprises: the IGBT heat sink comprises a heat sink, a plurality of IGBTs and a square resistor, wherein the IGBTs and the square resistor are fixed on the surface of the heat sink.

3. The SVG power unit of structural generic type according to claim 1, wherein the capacitor assembly includes a plurality of capacitors and a capacitor support plate, the capacitor support plate being fixed on the base plate, the capacitor support plate being used for fixing of the plurality of capacitors.

4. The SVG power unit of claim 1, wherein said control board card assembly comprises a sub-power unit control board, a driver board, a power board, a control board card housing, said sub-power unit control board, driver board, power board being secured to said control board card housing.

5. The SVG power unit of claim 1, further comprising a front panel secured to a side of the base plate.

6. The structural universal SVG power unit according to claim 5, characterized in that it further comprises a vacuum contactor fixed to the front panel surface.

7. The SVG power unit of claim 5, wherein said IGBT assembly further comprises an AC incoming copper bar and an AC outgoing copper bar connected to said IGBT assembly, said AC incoming copper bar and AC outgoing copper bar passing out of said front panel.

8. The structural universal SVG power unit according to claim 1, wherein the laminated busbar is in the shape of a tri-folded zigzag structure.

9. The SVG power unit of claim 2, wherein the heat sink has a water inlet and a water outlet, the water inlet and the water outlet being disposed at both ends of the same side from which heat is dissipated.

10. The SVG power unit of claim 1, wherein said laminated busbar has a busbar positive layer, a busbar negative layer, an insulating film layer, said busbar negative layer being disposed between said busbar positive layer and said insulating film layer.

11. The SVG power unit of structural generic type according to claim 2, wherein the plurality of IGBTs and the square resistor have a heat conductive silicone grease provided to the plurality of IGBTs and the square resistor mounting surface.

12. An electrical device, characterized by comprising the structural universal SVG power unit according to any one of claims 1 to 11.