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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


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
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