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Realization of high-current variable AC filter inductors using silicon iron powder magnetic core | IEEE Conference Publication | IEEE Xplore

Realization of high-current variable AC filter inductors using silicon iron powder magnetic core


Abstract:

Low-pass filter inductors are widely used in grid-connected power electronic converters. Different magnetic core materials are available for building these inductors. In ...Show More

Abstract:

Low-pass filter inductors are widely used in grid-connected power electronic converters. Different magnetic core materials are available for building these inductors. In this paper, the design of an inductor for an industrial-scale 1 MVA high-power three-phase ac-dc converter is reported. Selection of the core material, which depends on trading off between several aspects, is described. Instead of the traditional fixed inductance value for a large current range, the powder core inductor has a nonlinear inductance characteristic which is inversely proportional to the magnetic excitation. The benefits of using this variable inductance characteristic are described and verified by both circuit and magnetic simulation tools. A hardware prototype was built and initial experimental results are illustrated.
Date of Conference: 26-30 March 2017
Date Added to IEEE Xplore: 18 May 2017
ISBN Information:
Electronic ISSN: 2470-6647
Conference Location: Tampa, FL, USA

I. Introduction

Centralized high-power ac-dc voltage source converters (VSC) are in high demand in today's industries. Application examples include: electric traction drives, uninterruptible power supplies (UPS), commercial-scale microgrids [1], motor drive active front ends (AFE), high voltage dc transmission [2], etc. Low-pass filters are usually placed between the semiconductor switches and the power grid for attenuating high-frequency harmonics [3]. The power rating of the converter in this paper's application is 1 MVA. Most modern power semiconductor devices for these power levels operate at frequencies below 10 kHz due to switching loss constraints. The volume of the filter inductor is inversely proportional to the switching frequency; therefore, the inductor represents considerable weight, volume and cost of the converter system.

References

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