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A novel three-phase inverter for common-mode voltage reduction in electric drives

By Luca Concari, Davide Barater, Carlo Concar and Giampaolo Buticchi

Abstract

This paper presents an active solution for the elimination of the leakage current, in a three-phase PWM inverter drive. With respect to a traditional three-phase bridge, the proposed solution reduces the common-mode voltage variations, both in amplitude and frequency. A novel architecture for the inverter is presented. Between the DC source and the traditional three-phase bridge, two active DC-decoupling devices and a voltage-clamping network have been added. A dedicated control strategy was developed adopting a modified Space Vector PWM modulation, oriented to the reduction of the common-mode voltage variations in the proposed topology. Simulations showing the good performance of the solution are presented. A preliminary prototype was developed and experimental results are presented

Topics: common-mode voltage, drive, H8, inverter, leakage current, PWM, space vector, Three-phase, Energy Engineering and Power Technology, Electrical and Electronic Engineering
Publisher: 'Institute of Electrical and Electronics Engineers (IEEE)'
Year: 2015
DOI identifier: 10.1109/ECCE.2015.7310077
OAI identifier: oai:iris.unimore.it:11380/1170938
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