Ground leakage current reduction in single-phase grid-connected power converter

Mohammad H. Hedayati, Vinod John

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

2 Citations (Scopus)

Abstract

One of the major concerns during the design of grid-connected converters is meeting the electromagnetic interference (EMI) standards. Ground leakage current is another aspect which has a stringent limit due to safety concerns. Presence of high frequency pulses, with high dv/dt due to switching actions, in common-mode (CM) voltage excite parasitic capacitances of the power converters. This results in injection of peaky current to ground and causes high EMI noise level. In this paper a new method is proposed to make the CM voltage, of a single-phase grid-connected converter, sinusoidal and free of high frequency pulses. The proposed method consists of two parallel connected H-bridge power converters, which uses unipolar PWM with carrier interleaving angle of 180°. The proposed method reduces the ground leakage current by more than an order of magnitude. A modification to the LCL filter is adopted which further reduces the leakage current by 48%. It is shown that these modifications make the overall system insensitive to circuit nonidealities. Experimental results based on ground leakage current and EMI measurements on a 7.5kW parallel single-phase PWM-rectifier are presented. These results validate the effectiveness of the proposed method.

Original languageEnglish
Title of host publicationJoint International Conference - ACEMP 2015
Subtitle of host publicationAegean Conference on Electrical Machines and Power Electronics, OPTIM 2015: Optimization of Electrical and Electronic Equipment and ELECTROMOTION 2015: International Symposium on Advanced Electromechanical Motion Systems
EditorsH. Bulent Ertan
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages107-112
Number of pages6
ISBN (Electronic)9781467372398
DOIs
Publication statusPublished - 7 Mar 2016
Event1st Joint International Aegean Conference on Electrical Machines and Power Electronics, ACEMP 2015, International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2015 and International Symposium on Advanced Electromechanical Motion Systems, ELECTROMOTION 2015 - Side, Turkey
Duration: 2 Sep 20154 Sep 2015

Conference

Conference1st Joint International Aegean Conference on Electrical Machines and Power Electronics, ACEMP 2015, International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2015 and International Symposium on Advanced Electromechanical Motion Systems, ELECTROMOTION 2015
CountryTurkey
CitySide
Period2/09/154/09/15

Keywords

  • AC-DC power conversion
  • electromagnetic compatibility
  • leakage currents

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