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Components of the lcl filter structure

A technology of filter structure and components, applied in the direction of transforming equipment structure components, transformer/inductor components, transformer/inductor coils/windings/connections, etc., can solve problems such as heating and unstable filter operation, and achieve Effect of optimized cooling, reduced material cost and weight, improved efficiency

Active Publication Date: 2021-03-26
ABB E-MOBILITY BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, there is an unwanted magnetic flux in a relatively large area around the coil and it causes, i.e. heats, the metal parts near the inductor
Second, possible coupling between coils, which can lead to unstable filter operation

Method used

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  • Components of the lcl filter structure
  • Components of the lcl filter structure
  • Components of the lcl filter structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The LCL filter structure 1 comprises three pairs of two single chokes 2,3; 4,5; 6,7. The individual chokes are electrically connected together in pairs. Each pair is electrically connected to a capacitor bank 8 . The first pair consists of chokes 2 and 3, which are electrically connected to the output / input of phase U. The second pair includes chokes 4 and 5, which are electrically connected to the phase V output / input. The third pair includes chokes 6 and 7, which are electrically connected to the phase W output / input. Depending on the application, inputs can be swapped with outputs. All pairs of chokes are housed in metal protective enclosures 9 . Each of the chokes 2 - 7 has a winding 10 wound around the axis of an unyoke cylindrical core 11 . This means that the windings of the choke are formed around an open core. In this exemplary embodiment, the winding has the shape of a rectangular foil. Insulator spacers 12 are inserted between the windings 10 to allow ...

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Abstract

The invention relates to an LCL filter structure and in particular to an assembly of a filter structure to be connected to the output of an inverter or a grid converter, and to an assembly of a choke. The components of the LCL filter structure accordingly comprise three pairs of two chokes per phase U, V, W. Each choke has a winding wound around a yoke-free cylindrical core having at least two axes X-X, X'-X'. The assembly is characterized in that the LCL filter structure of the individual phases U, V, W has at least one choke, the winding of which surrounds an unyoked cylindrical core positioned centrally around the other axis Y-Y, Y'-Y' And entangled. The axis Y-Y, Y'-Y' is positioned parallel to the axis X-X, X'-X' at a distance such that each individual choke of each pair of chokes is not in contact with any other choke. All pairs of chokes are housed within a protective enclosure which together forms a magnetic barrier for all chokes.

Description

technical field [0001] The invention relates to an LCL filter structure and in particular to an assembly of a filter structure to be connected to the output of an inverter or a grid converter, and to an assembly of a choke. Background technique [0002] LCL passive filters are one of the most important components of existing power electronic inverters and are well designed to improve the power quality at the output. The output current of the inverter consists of a sine wave with higher harmonics from the switching frequency (current ripple) and is transmitted to the grid (such as a solar or wind inverter) or to a load (such as a motor, Electric arc furnace) needs to be filtered before it. In converter (such as solar inverter) filters, a topology of two inductors and capacitors is typically used. The most typical design for a high power inductor includes windings and a core made of ferromagnetic material. The current flowing in the inductor windings generates a magnetic fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H01F27/30H01F27/36H01F27/24
CPCH01F27/24H01F27/306H02M1/126H01F27/36H01F27/366H01F37/005H02M7/003
Inventor A.波里特D.马奇奥查M.斯维兹卡-贾斯恩斯卡V.科伊胡拉C.贝克
Owner ABB E-MOBILITY BV
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