CN210516374U - Resistor structure for low voltage ride through of wind power generation inverter - Google Patents
Resistor structure for low voltage ride through of wind power generation inverter Download PDFInfo
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- CN210516374U CN210516374U CN201921722188.5U CN201921722188U CN210516374U CN 210516374 U CN210516374 U CN 210516374U CN 201921722188 U CN201921722188 U CN 201921722188U CN 210516374 U CN210516374 U CN 210516374U
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- resistance card
- wind power
- low voltage
- voltage ride
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Abstract
The utility model discloses a resistor structure for wind power generation dc-to-ac converter low-voltage passes through, include the outside frame subassembly and install the resistance card subassembly in the outside frame subassembly, the resistance card subassembly is including being parallel to each other, and the resistance card of horizontal array arrangement, the resistance card includes the area wiring terminal resistance card at both ends and is located the non-area wiring terminal resistance card between the both ends area wiring terminal resistance card, crisscross conductive tube and the isolation ceramic pipe of being equipped with in proper order between adjacent resistance card, and the electric pipe at both ends sets up with the isolation ceramic pipe is crisscross around the resistance card subassembly, resistance card subassembly both sides all are fixed in outside frame subassembly both sides through the lead screw concatenation connection, the lead screw pierces into from the area wiring terminal resistance card of one side, pass each resistance card during it, conductive tube and isolation ceramic pipe, the other end is worn out from the area wiring terminal resistance card of opposite side. The utility model provides a resistor among the prior art bear the heavy load impact can not be strong, the problem that interference resistance is not strong between the resistance card under the condition operating mode.
Description
Technical Field
The utility model relates to a resistor field, in particular to a resistor structure that is used for wind power generation dc-to-ac converter low-voltage to pass through.
Background
Low Voltage Ride Through (LVRT), which means that when the voltage of the grid-connected point of the wind turbine drops, the wind turbine can keep being connected to the grid, even provide a certain reactive power to the grid, and support the grid to recover until the grid recovers to normal, thereby "riding through" this low voltage time region. Low Voltage Ride Through (LVRT) is a specific operational functional requirement for a grid-connected fan to remain connected to the grid even when a voltage sag occurs in the grid. The LVRT requirements proposed by different countries and regions vary. At present, new power grid operation criteria are established successively in some families with dominant wind power generation, off-grid conditions of a wind power system are quantitatively given, the generator is allowed to be off-grid only when the voltage of the power grid drops below a specified curve, and the generator provides reactive power when the voltage is in a concave part. This requires that the wind power generation system have a strong low voltage ride through capability and can conveniently provide reactive power support for the grid. The wind energy resistor is mainly applied to the low voltage ride through technology of a wind power generation inverter, is used on the rotor side of a wind power generator and is used for bypassing a rotor side converter. When the power grid generates dust and is disturbed by low voltage, the over-high voltage of the direct current bus and the over-large current of the rotor are prevented. The motor mainly works in a fault state and damps stator flux linkage. The maximum current of the wind driven generator is limited when the grid fault voltage drops, and huge electric energy is consumed instantly.
The main original resistor disc in the resistor is a sheet entity formed by cutting and punching a metal material, and the resistor disc obtains the resistance value required by design in a series-parallel connection mode, but the design of the prior art does not cause the problem of large size and space waste of the resistor.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the main object of the present invention is to provide a resistor structure for low voltage ride through of a wind power inverter, which aims to solve the problem that the inverter low voltage resistor in the prior art cannot bear the impact of a large load and the mutual interference is strong.
To achieve the above objects, the present invention provides a resistor structure for low voltage ride through of a wind power inverter, comprising an outer frame member and a resistor disc assembly installed in the outer frame member, the resistor disc assembly comprising parallel resistor discs, and resistance cards which are arranged in a transverse array and comprise resistance cards with terminal strips at two ends and resistance cards with non-terminal strips positioned between the resistance cards with terminal strips at two ends, conductive tubes and isolating ceramic tubes are sequentially arranged between adjacent resistance cards in a staggered manner, the electric tubes and the isolating ceramic tubes at the front end and the rear end of the resistance card assembly are arranged in a staggered manner, two sides of the resistance card assembly are connected and fixed at two sides of the external frame assembly in series through lead screws, the lead screws penetrate through the resistance cards with wiring terminals at one side, the resistance chip, the conductive tube and the isolating ceramic tube are penetrated through the resistor chip, the conductive tube and the isolating ceramic tube, and the other end of the resistor chip penetrates out of the resistor chip with the terminal on the other side.
In one embodiment, the outer frame assembly includes a protection plate covering an upper portion, a middle portion, and a bottom portion of the resistor assembly, and side plates fixed to both sides of the protection plate by screws, respectively, the side plates and the protection plate covering 5 sides of the resistor assembly, and the other 1 side of the resistor assembly communicating with an external space.
In one embodiment, spring gaskets are arranged at the inner connection positions of the screws, the side plates and the protection plates, and flat gaskets are further arranged between the screws and the spring gaskets.
In one embodiment, the upper end and the lower end of the resistor disc are provided with the bar-shaped mica sheets, and the bar-shaped mica sheets and the resistor disc connecting structure are in riveted connection.
In one embodiment, the bottom parts of the two sides of the side plate are respectively provided with a mounting guide rail, the mounting guide rails are woven, and the surface of the side plate is provided with a screw hole.
In one embodiment, the connecting structure between the plates of the protection plate is an integrally formed connecting structure.
In one embodiment, the upper side of the protection plate is provided with a heat dissipation through hole communicated with the inner space of the protection plate.
In one embodiment, handles are fixedly connected to one ends of the two sides of the side plates.
In one embodiment, at least one of the resistive patches between the resistive patches with terminals at both ends is a resistive patch with terminals, and the resistive patch with terminals is located at 1/3 of the entire array of resistive patches.
In one embodiment, both ends of the screw rod and the outer side of the resistance chip with the terminal are fixed through hexagon nuts, and a ceramic tube is arranged between the hexagon nuts and the resistance chip with the non-terminal.
The utility model has the advantages as follows:
(1) the resistor sheets in the resistor are connected by adopting the conductive tubes instead of welding, and the connection mode is easier to install, maintain and replace the resistor body.
(2) The mica sheet clamping edge-covering mode is adopted, and the phenomenon that the normal work is influenced by short circuit due to warping deformation of the resistance sheet is avoided. The mica sheets are reliably clamped in a riveting mode, and riveting points between adjacent resistor sheets are staggered, so that short circuit of the resistor caused by contact of rivets after thermal deformation of the resistor is avoided.
(3) The resistor can meet the requirements of adjusting circuit current and high-power load, has certain resistance value selection, and has lighter weight and smaller volume.
(4) The resistor has a planar surface for heat dissipation, and the used material has a small temperature coefficient, so that the resistor is more suitable for various service conditions of continuous and discontinuous periodic work.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is the overall structure schematic diagram of the external frame component and the resistance card component in the present invention.
Fig. 2 is the overall structure schematic diagram of the resistor disc assembly of the present invention.
Fig. 3 is a schematic view of the overall structure of the external frame assembly of the present invention.
Fig. 4 is the utility model provides a bar mica sheet and resistance card riveted structure sketch map.
[ main parts/assembly reference numerals ] description
| Reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
21 | Resistance card with binding |
| 10 | |
22 | |
| 11 | |
23 | Isolation |
| 12 | |
24 | |
| 13 | |
25 | Hexagon |
| 14 | Lifting handle | 26 | |
| 15 | Heat radiation through |
27 | Strip- |
| 2 | Resistor block assembly | 3 | |
| 20 | Resistance card with no binding post |
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them.
Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (e.g., upper, lower, left, right, front, rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific state (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
The description in this application as relating to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be a fixed connection, a removable connection, or an integral molding; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Example 1:
referring to fig. 1 to 4, a resistor structure for low voltage ride through of a wind power inverter comprises an outer frame assembly 1 and a resistor disc assembly 2 installed in the outer frame assembly 1, wherein the resistor disc assembly 2 comprises resistor discs 3 which are parallel to each other and are arranged in a transverse array, the resistor disc 3 comprises resistor discs 21 with connecting terminals at two ends and resistor discs 20 with non-connecting terminals located between the resistor discs 21 with connecting terminals at two ends, conductive tubes 22 and isolating ceramic tubes 23 are sequentially arranged between adjacent resistor discs 3 in an alternating manner, the conductive tubes and the isolating ceramic tubes 23 at the front end and the rear end of the resistor disc assembly 2 are arranged in an alternating manner, two sides of the resistor disc assembly 2 are connected and fixed at two sides of the outer frame assembly 1 in series through lead screws 26, the lead screws 26 penetrate through the resistor discs 21 with connecting terminals at one side and pass through the resistor discs 3, the conductive tubes 22 and the isolating ceramic tubes 23, the other end of the resistor passes out of the resistor sheet with the connecting terminal 21 on the other side.
The body part of the resistor is formed by a hexagonal nut 25, a ceramic tube 24, a contact tube 22, a separating ceramic tube 23, the assembly 2 of resistance cards 21 without terminals and the resistance cards 21 with terminals and a lead screw 26.
The resistor disc assembly 2 with the connecting terminals and the resistor disc assembly 2 without the connecting terminals are formed by riveting two mica sheets at two ends of the corresponding U-shaped resistor disc 3 with the connecting terminals and the corresponding U-shaped resistor disc 3 without the connecting terminals so as to ensure the strength of the resistor disc 3 against heat deformation. And the riveted parts of the mica sheets between two adjacent resistance sheets 3 are mutually staggered, so that the short circuit caused by the contact of adjacent rivets after the resistance sheets 3 are thermally deformed is avoided.
The ceramic tubes 23 and the conductive tubes 22 are alternately distributed among the resistor disc assemblies 2, and the two ends of the ceramic tubes 24 and the hexagonal nuts 25 are fixed on the screw rods 26. Under the bolt tightening fixation, the resistance chip 3 is contacted with the conductive tube 22 to form a loop, so that the high cost and long labor time of welding or bolt connection by welding sheets are avoided. The box body of the resistor is composed of a protection plate 10 and two side plates 11 which are integrated into a whole from three sides, the side plates 11 are connected with the protection net through cross-shaped pan head screws 13, and two handles 14 are mounted on the side plates 11 to facilitate the carrying of the resistor. The outer side of the side plate 11 is fixed with a mounting guide rail 12 by a through hole type rivet pressing nut column, and the mounting guide rail 12 can be used for fixing the resistor in a working occasion.
Referring to fig. 3, preferably, the outer frame assembly 1 includes a protection panel 10 wrapping upper, middle and bottom portions of the resistance sheet assembly 2, and side panels 11 fixed to both sides of the protection panel 10 by screws 13, respectively, the side panels 11 and the protection panel 10 wrapping 25 sides of the resistance sheet assembly, and the other 1 side of the resistance sheet assembly 2 communicating with an external space.
Referring to fig. 3, preferably, spring washers are disposed at the inner connection positions of the screws 13, the side plates 11 and the protection plates 10, and flat washers are disposed between the screws 13 and the spring washers.
The spring gasket at the inner connection part of the screw 13, the side plate 11 and the protection plate 10 and the flat gasket between the nail and the spring gasket help to prevent the resistance card 3 from being damaged by vibration, and play a certain role in impact resistance protection.
Referring to fig. 2 and 4, preferably, the upper end and the lower end of the resistor disc 3 are both provided with the bar-shaped mica sheets 27, and the connection structures of the bar-shaped mica sheets 27 and the resistor disc 3 are both riveted.
The bar-shaped mica sheets 27 can ensure the strength of the resistance sheets 3 against heat deformation, and the riveted parts of the mica sheets between two adjacent resistance sheets 3 are mutually staggered, so that the short circuit caused by the contact of adjacent rivets after the resistance sheets 3 are subjected to heat deformation is avoided.
Referring to fig. 3, preferably, the bottom parts of both sides of the side plate 11 are provided with mounting rails 12, and the mounting rails 12 are woven and have screw holes on the surface.
Referring to fig. 3, the connection structure between the plates of the protection plate 10 is preferably an integrally formed connection structure.
Referring to fig. 3, preferably, the upper side of the shielding plate 10 is provided with a heat radiating through-hole 15 communicating with the inner space of the shielding plate 10.
Referring to fig. 3, preferably, handles 14 are fixedly connected to both ends of the side plates 11.
The resistor is a box body formed by a three-surface integrated protection plate 10 and two side plates 11, and the resistor body is fixed on the two side plates 11 of the box body through isolation ceramic parts. Two handles 14 are arranged at two ends of the side plate 11, and the resistor is convenient to carry.
Example 2:
referring to fig. 2, preferably, at least one of resistive sheets 3 between resistive sheets 21 with terminals at both ends is resistive sheet 21 with terminals, and resistive sheet 21 with terminals is located at 1/3 of the entire array of resistive sheets 3.
The utility model discloses a 3 binding post of resistance card can select the binding post position of working a telephone switchboard according to the actual use condition, for example need insert the impedance great with electrical apparatus, then select to connect between both ends area binding post resistance card 21 and on the resistance card 3 of one side.
Referring to fig. 2, preferably, both ends of the screw 26 and the outer side of the resistance card with terminals 21 are fixed by hexagonal nuts 25, and a ceramic tube 24 is arranged between the hexagonal nuts 25 and the resistance card with terminals 20.
The working principle of the utility model is as follows:
the resistance body part is formed by a hexagonal nut 25, a ceramic tube 24, a contact tube 22, a separating ceramic tube 23, a 2l assembly 2 of resistance cards without terminals and resistance cards with terminals 21 and a lead screw 26. The resistor disc assembly 2 with the connecting terminals and the resistor disc assembly 2 without the connecting terminals are formed by riveting two mica sheets at two ends of the corresponding resistor disc 3 with the connecting terminals and the corresponding resistor disc 3 without the connecting terminals so as to ensure the strength of the resistor disc 3 against heat deformation. And the riveted parts of the mica sheets between two adjacent resistance sheets 3 are mutually staggered, so that the short circuit caused by the contact of adjacent rivets after the resistance sheets 3 are thermally deformed is avoided. The ceramic tubes 23 and the conductive tubes 22 are alternately distributed among the resistor disc assemblies 2, and the two ends of the ceramic tubes 24 and the hexagonal nuts 25 are fixed on the screw rods 26. Under the bolt tightening fixation, the resistance chip 3 is contacted with the conductive tube 22 to form a loop, so that the high cost and long labor time of welding or bolt connection by welding sheets are avoided.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A resistor structure for low voltage ride through of a wind power generation inverter is characterized by comprising an outer frame assembly and a resistor disc assembly arranged in the outer frame assembly, wherein the resistor disc assembly comprises resistor discs which are parallel to each other and are arranged in a transverse array, each resistor disc comprises resistor discs with connecting terminals at two ends and resistor discs with non-connecting terminals positioned between the resistor discs with the connecting terminals at the two ends, conductive tubes and isolating ceramic tubes are sequentially arranged between the adjacent resistor discs in an alternating mode, the electric tubes and the isolating ceramic tubes at the front end and the rear end of the resistor disc assembly are arranged in an alternating mode, two sides of the resistor disc assembly are connected and fixed on two sides of the outer frame assembly in series through screw rods, the screw rods penetrate through the resistor discs with the connecting terminals at one side, and penetrate through the resistor discs, the conductive tubes and the isolating ceramic tubes, the other end of the resistor penetrates out of the resistor disc with the terminal on the other side.
2. The resistor structure for low voltage ride through of a wind power inverter according to claim 1, wherein the outer frame assembly includes a guard plate wrapping an upper portion, a middle portion, and a bottom portion of the resistor assembly, and side plates fixed to both sides of the guard plate by screws, respectively, the side plates and the guard plate wrapping 5 sides of the resistor assembly, and the other 1 side of the resistor assembly communicating with an external space.
3. The resistor structure for wind power inverter low voltage ride through of claim 2, wherein a spring washer is arranged at the inner connection part of the screw and the side plate and the protection plate, and a flat pad is arranged between the screw and the spring washer.
4. The resistor structure for the low voltage ride through of the wind power generation inverter according to claim 1, wherein the upper and lower ends of the resistor sheet are provided with bar-shaped mica sheets, and the bar-shaped mica sheets and the resistor sheet connecting structure are riveted.
5. The resistor structure for the low voltage ride through of the wind power inverter as claimed in claim 2, wherein the side plates are provided with mounting rails at the bottoms of the two sides, and the mounting rails are woven and provided with screw holes on the surfaces.
6. The resistor structure for low voltage ride through of a wind power inverter as claimed in claim 2, wherein the connection structure between the plates of the fender is an integrally formed connection structure.
7. The resistor structure for low voltage ride through of a wind power inverter according to claim 2, wherein the upper side of the guard plate is provided with heat dissipating through holes communicating with the inner space of the guard plate.
8. The resistor structure for the low voltage ride through of the wind power inverter as recited in claim 2, wherein handles are fixedly connected to one end of each side plate.
9. The resistor structure for wind power inverter low voltage ride through of claim 1, wherein at least one of the resistor sheets between the two terminal resistor sheets is a terminal resistor sheet, and the terminal resistor sheet is located at 1/3 of the whole resistor sheet array.
10. The resistor structure for wind power inverter low voltage ride through of claim 1, wherein both ends of the lead screw and the outer side of the resistance sheet with the terminals are fixed by hexagonal nuts, and a ceramic tube is arranged between the hexagonal nuts and the resistance sheet without the terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921722188.5U CN210516374U (en) | 2019-10-14 | 2019-10-14 | Resistor structure for low voltage ride through of wind power generation inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921722188.5U CN210516374U (en) | 2019-10-14 | 2019-10-14 | Resistor structure for low voltage ride through of wind power generation inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210516374U true CN210516374U (en) | 2020-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921722188.5U Active CN210516374U (en) | 2019-10-14 | 2019-10-14 | Resistor structure for low voltage ride through of wind power generation inverter |
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| CN (1) | CN210516374U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571002A (en) * | 2019-10-14 | 2019-12-13 | 深圳市富临特科技有限公司 | Resistor for low voltage ride through of wind power generation inverter |
| WO2023097753A1 (en) * | 2021-12-03 | 2023-06-08 | 广东福德电子有限公司 | Anti-high current resistor |
-
2019
- 2019-10-14 CN CN201921722188.5U patent/CN210516374U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571002A (en) * | 2019-10-14 | 2019-12-13 | 深圳市富临特科技有限公司 | Resistor for low voltage ride through of wind power generation inverter |
| WO2023097753A1 (en) * | 2021-12-03 | 2023-06-08 | 广东福德电子有限公司 | Anti-high current resistor |
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