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LCL filter utilizing integrated inductors

A technology that integrates inductors and filters, applied to electrical components, output power conversion devices, etc., can solve the problems of low power density and high cost of grid-connected inverters, and achieve increased power density, reduced volume, and reduced magnetic The effect of core volume

Inactive Publication Date: 2012-07-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This leads to higher cost and lower power density of grid-connected inverters

Method used

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  • LCL filter utilizing integrated inductors
  • LCL filter utilizing integrated inductors
  • LCL filter utilizing integrated inductors

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0021] For the single-phase LCL filter 3, the present invention provides the following three specific implementation modes. exist Figure 7 , the inductance L 1 The winding N 1 8 wound on a pair of U-shaped magnetic cores 6 1 on, the inductance L 2 The winding N 2 9 Wound on another pair of U-shaped magnetic cores 6 2 On the top, the openings of the two magnetic cores are placed opposite each other, and an I-shaped magnetic core 7 is inserted between them 5 as a common magnetic column. The oblique line in the figure indicates the air gap 10, the dotted line indicates the fl...

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Abstract

The invention discloses an LCL filter utilizing integrated inductors. The LCL filter can be applied to a single-phase inverter or a three-phase grid-connected inverter, the size of magnetic cores can be effectively reduced, and the power density of grid-connected inverters is improved. The LCL filter comprises an inverter side inductor L1, a filter capacitor C, and a grid side inductor L2, wherein the input end of the inductor L1 is connected with the middle point of a leg of the inverter, the output end of the inductor L1 is connected with the input ends of the inductor L2 and the capacitor C, and the output end of the inductor L2 is connected with a power grid. Windings of the inductor L1 and the inductor L2 are wound on two independent magnetic cores respectively, a public magnetic post without air gap is arranged between the two magnetic cores, and magnetic flux of linkages of windings of the inductor L1 and the inductor L2 are counteracted on the public magnetic post, and the magnetic flux of the public magnetic post is reduced, so that the size of the public magnetic can be reduced. Simultaneously, coupling does not exist between the inductor L1 and the inductor L2, so that the integrated LCL filter has the same characteristic with that in discrete conditions.

Description

technical field [0001] The invention belongs to the field of power electronic device design, and more specifically relates to an LCL filter using integrated inductors, which can be applied to single-phase or three-phase grid-connected inverters, and can effectively reduce the The core volume increases the power density of the grid-connected inverter. Background technique [0002] figure 1 It is the main circuit of the single-phase LCL grid-connected inverter. The LCL grid-connected inverter includes a DC source 1 , a single-phase inverter bridge 2 , a single-phase LCL filter 3 and a single-phase grid 4 . Among them, single-phase inverter bridge 2 is composed of switching tube S 1 ~S 4 and freewheeling diode D 1 ~D 4 Composed of single-phase LCL filter 3 by the inverter side inductance L 1 , filter capacitor C and grid side inductance L 2 composition, inductance L 1 The input terminal of the inverter is connected to the midpoint of the bridge arm, and the inductance ...

Claims

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Application Information

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IPC IPC(8): H02M1/12
Inventor 潘冬华阮新波王学华鲍陈磊李巍巍
Owner HUAZHONG UNIV OF SCI & TECH
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