CN211604884U - A New Type of Magnetic Integrated Reactor - Google Patents

Abstract

The novel magnetic integrated reactor disclosed by the utility model comprises three core columns with air gaps, an upper yoke and a lower yoke connecting the upper and lower ends of the three core columns with air gaps, and the upper and lower yokes pass through a pair of The upper and lower clips and several upper and lower through-core tightening screws are clamped; the upper clips and the corresponding lower clips are connected by several pulling screws; a coil is installed on each core column with an air gap, and each A coil is provided with upper and lower outlet lines, and it also includes a side column without air gap, the side column without air gap is connected with the upper yoke and the lower yoke through a clamp, and three belts are arranged on one side of the side column without air gap All air-gapped stems and side columns are parallel to each other, and the upper yoke and lower yoke are parallel to each other. The utility model is mainly used for the grid-side filter circuit in the three-phase photovoltaic inverter to suppress the differential mode and common mode currents in the system.

Description

A New Type of Magnetic Integrated Reactor

technical field

The utility model relates to the technical field of parallel connection of high-power photovoltaic inverters, in particular to a common differential mode reactor.

Background technique

There is a key problem that needs to be solved in the current high-power photovoltaic inverters in the market that are connected in parallel and then connected to the grid, that is, the common mode current between the two devices after the parallel connection is caused by the error of the control system and the power tube. Since the rear end of the inverter only has differential mode filtering (LC filtering, where L is a three-phase three-column reactor), it does not have the function of common mode filtering. At present, there are mainly two ways to solve the problem, one is to rely on the double split transformer at the back end, and the other is to increase the balance of the reactor and match it with an ordinary double-winding transformer. The disadvantages of both solutions are as follows:

1. High cost. The cost of double split transformers is more than 10% higher than that of ordinary double-group transformers, and the cost of adding balanced reactors also increases by more than 10%

2. The volume is large and the system is complex. The double-split transformer has requirements on the distance between the two input windings to ensure that the leakage inductance between the two windings meets the requirements. The balanced reactor requires an independent box and space, so the volume of these two solutions is too large, which also increases the system. Complexity.

Utility model content

The technical problem to be solved by the utility model is to provide a new type of magnetic integrated reactor for the high-power photovoltaic inverter in parallel and then grid-connected scheme, and the new type of magnetic integrated reactor has the functions of differential mode filtering and common mode filtering at the same time , so that only ordinary double-winding transformers are needed for back-end grid connection, and balanced reactors or double-split transformers are eliminated.

The technical problem to be solved by the present utility model can be realized through the following technical solutions:

A new type of magnetic integrated reactor, comprising three core columns with air gaps, an upper yoke, and a lower yoke, the upper yoke is clamped by a pair of upper clamps and a plurality of upper through-core tightening screws, and a pair of upper yokes are clamped. The clips are connected by a plurality of upper pressing plates; the lower yoke is clamped by a pair of lower clips and a plurality of lower through-core tightening screws, and a pair of lower clips are connected by a plurality of feet; the upper clips are connected with the corresponding The lower clips are connected by a plurality of pulling screws; a coil is installed on each core column with an air gap, and each coil is provided with an upper outlet row and a lower outlet row, which is characterized in that it also includes a side without air gap The upper and lower ends of the side pillars without air gaps are connected with the upper yoke and the lower yoke through a pair of clamps, all the core pillars with air gaps and the side pillars without air gaps are parallel to each other, and the The upper yoke and the lower yoke are parallel to each other.

In a preferred embodiment of the present invention, the widths of the upper yoke, the lower yoke and the side column without air gap are all 0.5-1 times the width of the core column with air gap.

In a preferred embodiment of the present invention, the coil is a foil wound coil/wire wound or a vertical wound coil.

The utility model is mainly used in the technical field of parallel connection of high-power photovoltaic inverters, and particularly relates to a common differential mode reactor.

Through actual testing, the utility model has the following advantages compared with the prior art:

1. Low cost: The cost of ordinary double-winding transformers is 10% or more lower than that of double-split transformers;

2. Low loss: the connecting wires and windings are reduced, and the overall efficiency can be increased by 0.05% or more;

3. High reliability: reducing windings or balancing reactors means reducing components, and the reliability is increased by 10% or more.

Description of drawings

FIG. 1 is a front view of the magnetic integrated reactor of the present invention.

FIG. 2 is a left side view of the magnetic integrated reactor of the present invention.

FIG. 3 is a top view of the magnetic integrated reactor of the present invention.

FIG. 4 is a three-dimensional view (axonometric view) of the magnetic integrated reactor of the present invention.

FIG. 5 is a schematic diagram of the iron core of the magnetic integrated reactor of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to Figures 1 to 5, the new magnetic integrated reactor shown in the figures includes three core columns 5a, 5b, 5c with air gaps, and the upper ends of the three core columns 5a, 5b, 5c with air gaps pass through the upper The yokes 10 are connected, the upper yoke 10 is clamped by a pair of upper clips 7a, 7b and a plurality of upper through-center tightening screws 2a, and a pair of upper clips 7a, 7b are connected by a plurality of upper pressing plates 8.

The lower ends of the three stems 5a, 5b, 5c with air gaps are connected by the lower yoke 11, and the lower yoke 11 is clamped by a pair of lower clamps 3a, 3b and a plurality of lower through-center tightening screws 2b. The pieces 3a, 3b are connected by a number of feet 1 .

The upper clip 7a and the corresponding lower clip 3a are connected by a plurality of pulling screws 9a; the upper clip 7b and the corresponding lower clip 3b are connected by a plurality of pulling screws 9b.

A coil 12a, 12b, 12c is mounted on each of the core posts 5a, 5b, 5c with air gaps, and each coil 12a, 12b, 12c is provided with an upper outlet row 6 and a lower outlet row 4. Each coil 12a, 12b, 12c is a foil wound coil or a wire wound coil or a vertical wound coil.

The utility model is characterized in that it also includes a side post 13 without air gap. There are three air-gapped stems 5a, 5b, 5c, and all the air-gapped stems 5a, 5b, 5c and the side stems 13 are parallel to each other. The upper yoke 10 and the lower yoke 11 are parallel to each other.

The widths 13 of the upper yoke 10 , the lower yoke 11 , and the side posts without air gaps are all 0.5-1 times the widths of the core posts 5 a , 5 b , and 5 c with air gaps.

The utility model is mainly used for the grid-side filter circuit in the three-phase photovoltaic inverter to suppress the differential mode and common mode currents in the system.

Claims (3)

1. A new type of magnetic integrated reactor with both differential mode filtering and common mode filtering functions, including three core columns with air gaps, an upper yoke, and a lower yoke, the upper yoke passes through a pair of upper clips and Several upper through-core tightening screws are clamped, and a pair of upper clips are connected by several upper pressure plates; the lower yoke is clamped by a pair of lower clips and a plurality of lower through-core tightening screws, and a pair of lower clips are clamped through several The feet are connected together; the upper clips and the corresponding lower clips are connected by a plurality of pulling screws; a coil is installed on each core column with an air gap, and each coil is provided with an upper outlet row and a lower outlet. It is characterized in that it also includes a side column without air gap, the upper and lower ends of the side column without air gap are connected with the upper yoke and the lower yoke through a pair of clamps, and all the core columns with air gaps The upper yoke and the lower yoke are parallel to each other with the side column without air gap. 2. A new type of magnetic integrated reactor according to claim 1, characterized in that, the width of the upper yoke, the lower yoke and the side column without air gap is 0.5-50% of the width of the core column with air gap. 1 times. 3 . The novel magnetic integrated reactor according to claim 1 , wherein the coil is a foil-wound coil or a wire-wound coil or a vertical-wound coil. 4 .

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