Dynamic reactive power compensation device

Abstract

The utility model discloses a dynamic reactive power compensation device, which belongs to the technical field of power quality dynamic reactive power compensation equipment and comprises an H bridge unit, a three-in-one control board and a bypass switch, an electromagnetic interference shielding cover is covered on the outer side of the three-in-one control board, and an insulating film is arranged on one surface, close to the three-in-one control board, of the electromagnetic interference shielding cover; the problem of bypass switch misoperation caused by electromagnetic interference existing in an existing bypass machine type is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of power quality dynamic reactive compensation equipment, and specifically relates to a dynamic reactive compensation device. BACKGROUND

[0002] With the rapid development of the electric power industry and the increasing demand for electricity, the power supply capacity of the power grid is facing increasingly high requirements. In the process of distribution network construction, a large number of reactive compensation devices need to be configured to improve the stability and efficiency of the power grid. Traditional reactive compensation devices, such as synchronous phase modulators and capacitors, have slow response speed, discontinuous adjustment, and high harmonic content, which cannot meet the rapidly changing needs of modern power grids. Therefore, dynamic reactive compensation devices have emerged as the times require and have become important equipment in modern flexible alternating current transmission systems.

[0003] The working principle of the dynamic reactive compensation device is to compensate in real time and quickly according to the dynamic changes in the reactive power of the power grid to improve the power factor of the power grid, improve the power quality, and reduce line losses. According to the different structural principles, dynamic reactive compensation devices can be divided into various types, such as static synchronous compensators (SVG) and static reactive compensators (SVC). Among them, SVG has become a more advanced dynamic reactive compensation device due to its low harmonics, high efficiency, and fast dynamic response.

[0004] Dynamic reactive compensation devices belong to the power quality product line equipment. When the SVG device is started and stopped, the whole machine will generate strong electromagnetic radiation interference signals. This radiation exceeds the standard for civilian equipment. For SVG devices with bypass functions, it will cause great interference to the module bypass switch driving circuit, causing the SVG bypass module to malfunction. Although adjusting the capacitance parameters in the driving circuit, reducing the transistor amplification gain of the driving circuit, and modifying the base resistance of the transistor in the driving circuit can improve the anti-electromagnetic radiation capability of the module, they still cannot completely shield the magnetic field generated by the start-stop operation of the whole machine. Therefore, it is necessary to shield the electromagnetic radiation generated by the start-stop operation of the whole machine to solve the problem of SVG bypass module malfunction. SUMMARY

[0005] The utility model provides a kind of dynamic reactive compensation equipment (SVG) and electromagnetic interference shield, solve the problem of bypass switch malfunction caused by electromagnetic interference existing in existing bypass model.

[0006] To achieve the above purpose, the dynamic reactive compensation device according to the utility model comprises an H-bridge unit, a three-in-one control board and a bypass switch. An electromagnetic interference shield is attached to the outside of the three-in-one control board. An insulating film is arranged on one side of the electromagnetic interference shield close to the three-in-one control board.

[0007] Further, the electromagnetic interference shield covers the driving circuit of the three-in-one control panel.

[0008] Further, the electromagnetic interference shield comprises a shield body, and mounting holes are formed in the edges of the shield body.

[0009] Further, the shield body is made of aluminum alloy material.

[0010] Further, the shield body is provided with an oxidation-resistant film.

[0011] Further, the edges of the shield body are provided with reinforcing structures.

[0012] Further, the mounting holes are arranged in two groups, and the two groups are oppositely arranged.

[0013] Further, the shield body and the insulating film are adhered by glue.

[0014] Further, the height of the shield body is 3-3.5 cm.

[0015] Further, the three-in-one control panel, the discharge resistor and the bypass power supply are sequentially arranged above the plurality of electrolytic capacitors, and the bypass switch is arranged on one side of the plurality of electrolytic capacitors.

[0016] Compared with the prior art, the utility model has at least the following beneficial technical effects:

[0017] The dynamic reactive power compensation equipment provided by the utility model sets the shield outside the sensitive component, covers the triode in the driving circuit which is misoperated due to electromagnetic radiation interference, effectively shields the external electromagnetic interference signal, and can significantly improve the anti-interference ability and overall operation stability of the SVG equipment.

[0018] Further, the shield body is made of aluminum alloy material, the aluminum alloy is not only light in weight, but also has good conductivity, can effectively shield and absorb external electromagnetic interference, and can effectively shield the external electromagnetic interference signal.

[0019] Further, the shield body is provided with an oxidation-resistant film, improving the corrosion resistance and wear resistance of the shield.

[0020] Further, the edges of the shield body are provided with reinforcing structures, increasing the mechanical strength of the shield, improving the overall stability and durability of the shield.

[0021] Further, the mounting holes are arranged in two groups, and the two groups are oppositely arranged, so that the shielding effect is not reduced due to improper positioning during installation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structural schematic view of the electromagnetic interference shielding cover of the utility model;

[0023] Figure 2 It is the power module layout schematic view of one embodiment of the utility model;

[0024] Figure 3 It is the bypass switch drive circuit schematic diagram of the equipment mentioned in the utility model.

[0025] In the drawing: 1, electromagnetic interference shielding cover; 2, three-in-one control panel; 3, bypass switch; 4, bypass power supply; 5, electrolytic capacitor; 6, discharge resistance; 11, shielding cover body; 12, mounting hole. DETAILED DESCRIPTION

[0026] The utility model will be described in detail below in combination with the drawings and specific embodiments.

[0027] In order to make the personnel in the technical field better understand the technical scheme in the utility model, the technical scheme in the embodiment of the utility model will be described clearly and completely below in combination with the drawings of the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor should belong to the scope of protection of the utility model.

[0028] It should be noted that when an element is referred to as "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like used herein indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] Refer toFigure 2 The dynamic reactive compensation device with bypass function is structurally two links (H-bridge modules) packaged together as a module unit, wherein a bypass power supply is connected in parallel on one link in one module, and a bypass switch is provided on each module in the cascade, and the bypass switch is directly bypassed when opened.

[0031] The dynamic reactive compensation device has three phases, each phase including 18 power module units, and each two H-bridges are independently packaged as a power module unit, and each module is independently provided with a three-in-one (power supply, drive, sampling) control board.

[0032] The single power module of the dynamic reactive compensation device includes two H-bridge units, an electromagnetic interference shield 1, a three-in-one control board 2, a bypass switch 3, a bypass power supply 4, a plurality of electrolytic capacitors 5, and a discharge resistor 6; wherein the three-in-one control board 2, the discharge resistor 6 and the bypass power supply 4 are arranged in sequence and located above the plurality of electrolytic capacitors 5, and the bypass switch 3 is arranged on one side of the plurality of electrolytic capacitors 5.

[0033] Any module unit of any phase of the dynamic reactive compensation device has a bypass function and is provided with a bypass switch 3; the bypass switch 3 of the dynamic reactive compensation device is controlled by the drive circuit of the three-in-one control board 2.

[0034] The electromagnetic interference shield 1 mainly covers the bypass switch drive department which is easily affected by electromagnetic interference and causes misoperation, such as sensitive components such as triodes in the drive circuit of the three-in-one control board 2, and the drive circuit diagram is shown in Figure 3 Referring to Figure 1 , the electromagnetic interference shield 1 includes a shield body 11 and an insulating film attached to the back of the shield body 11. In order to facilitate installation, four mounting holes 12 are designed on both sides of the shield body 11, and the four mounting holes are arranged in two groups, and the two groups are oppositely arranged. The positions of these hole positions are accurately calculated, so that the shield can be firmly fixed on the specified position of the SVG device by screws or other fasteners. The design of the mounting hole takes into account the symmetry of the electromagnetic interference shield 1, so as to ensure that the shielding effect will not be reduced due to improper positioning during installation.

[0035] Through the mounting holes on the shield, the shield is fixed to the three-in-one control board 2 in the SVG device by using appropriate fixing parts (such as screws).

[0036] The electromagnetic interference shield 1 is fixed on the upper surface of the three-in-one control panel 2 through four mounting holes 12 at the edge, and directly contacts with the metal shell of the power unit. The electromagnetic interference shield 1 is designed to adapt to the shape of a specific area inside the SVG device, and can completely cover the electronic components that need to be protected. Specifically, the electromagnetic interference shield 1 can cover the bypass switch drive circuit part on the three-in-one control panel, and the mounting holes 12 are used to mount the fixing screws.

[0037] The shield body 11 of the electromagnetic interference shield 1 is made of aluminum alloy material. The aluminum alloy material not only has light weight, but also has good electrical conductivity, which can effectively shield external electromagnetic interference signals.

[0038] Preferably, one side of the electromagnetic interference shield body 11 close to the three-in-one control panel is pasted with a complete insulating film, which is used to isolate the electronic components of the drive circuit part of the three-in-one control panel 2. The electromagnetic interference shield 1 and other live parts inside the SVG device are short-circuited. This layer of insulating film needs to have good temperature resistance and not easy to fall off or deteriorate in high temperature environment.

[0039] Preferably, the shield body 11 and the insulating film are bonded by glue.

[0040] Preferably, the height of the shield body 11 is 3cm-3.5cm.

[0041] Preferably, the edges of the shield body 11 are provided with reinforcing structures which are integrated with the shield body.

[0042] When manufacturing the electromagnetic interference shield 1, a precise mold is needed to ensure the size accuracy, and an oxidation-resistant treatment is needed on the surface treatment, such as electroplating, spraying, chemical deposition or vapor deposition, etc., to prolong the service life. At the same time, the selection of the insulating film also needs to meet the relevant standards to ensure its long-term stability and reliability.

[0043] The specific standards include: GB / T 13542.4-2009 and IEC 60674-3-2:1992 double standards. The shielding layer insulating film is made of fireproof polypropylene material, the fireproof performance is tested by UL94 method, reaches VTM-0 level, the heat distortion temperature is ≥121℃, the dielectric constant is 1.9, and has excellent electrical heat resistance and electromagnetic shielding performance.

[0044] The above-mentioned electromagnetic interference shield 1 is suitable for various SVG devices, especially the SVG installed in industrial environment, because there are often many electromagnetic interference sources in such environment. Through the above-mentioned electromagnetic interference shield, the anti-interference ability and overall operation stability of the SVG device can be significantly improved.

[0045] The term "consisting of" is intended to mean a combination of the specified elements, ingredients, components, or steps, and no other elements, ingredients, components, or steps. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components, or steps herein is not meant to be construed as a statistical requirement that all of the elements, ingredients, components, or steps be present. Rather, the term "comprising" or "including" is intended to mean that the described elements, ingredients, components, or steps are present, but other elements, ingredients, components, or steps not expressly identified herein can be also be present. The use of the term "comprising" or "including" does not therefore exclude other elements, ingredients, components, or steps. The use of the term "or" in the description is used to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or as is clear from the context, the use of "or" in the description is used to mean "and / or" within the scope of this application. Therefore, such overall use of "or" is not intended to be interpreted as a limitation on the scope of the application.

[0046] A plurality of elements, ingredients, components, or steps can be provided by a single integrated element, ingredient, component, or step. Alternatively, a single integrated element, ingredient, component, or step might be divided into separate plural elements, ingredients, components, or steps. To the extent any disclosure herein refers to "a" or "one" element, ingredient, component, or step, such reference is not intended to foreclose the use of "plurality" or "more" of that element, ingredient, component, or step.

[0047] It is understood that the above description is intended to be illustrative and not restrictive. Many embodiments and applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the application should be determined, not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for the purpose of the present disclosure. The omission of any aspect of the subject matter disclosed herein does not preclude coverage of such aspect, nor does it surrender, disclaim, compromise, alienate, or render a disclaimer of any aspect of the subject matter disclosed herein.

Claims

1. A dynamic reactive power compensation device, characterized in that: The invention comprises an H-bridge unit, a three-in-one control board (2) and a bypass switch (3); the outer side of the three-in-one control board (2) is covered with an electromagnetic interference shielding cover (1); and an insulating film is provided on a side of the electromagnetic interference shielding cover (1) close to the three-in-one control board (2).

2. A dynamic reactive power compensation device according to claim 1, characterized in that: The electromagnetic interference shielding cover (1) covers the outside of the driving circuit of the three-in-one control board (2).

3. A dynamic reactive power compensation device according to claim 1, characterized in that: The electromagnetic interference shielding cover (1) comprises a shielding cover body (11), and a mounting hole (12) is provided on the edge of the shielding cover body (11).

4. A dynamic reactive power compensation device according to claim 3, characterized in that: The shielding cover body (11) is made of aluminum alloy material.

5. A dynamic reactive power compensation device according to claim 4, characterized in that: An anti-oxidation film is provided on the outside of the shielding cover body (11).

6. A dynamic reactive power compensation device according to claim 3, characterized in that: The edges of the shielding cover body (11) are all provided with a reinforcement structure.

7. A dynamic reactive power compensation device according to claim 3, characterized in that: The mounting holes (12) are arranged in groups of two, with the two groups being arranged opposite to each other.

8. The dynamic reactive power compensation device according to claim 3, characterized in that: The shielding cover body (11) is adhered to the insulating film by glue.

9. The dynamic reactive power compensation device according to claim 3, characterized in that: The height of the shielding cover body (11) is 3 cm-3.5 cm.

10. The dynamic reactive power compensation device according to claim 1, characterized in that: It also includes a bypass power supply (4), a discharge resistor (6) and a plurality of electrolytic capacitors (5). The three-in-one control board (2), the discharge resistor (6) and the bypass power supply (4) are arranged in sequence and located above the plurality of electrolytic capacitors (5). The bypass switch (3) is arranged on one side of the plurality of electrolytic capacitors (5).

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