Active common-mode filter for ground leakage current reduction in grid-connected PV converters operating with arbitrary power factor

Davide Barater, Giampaolo Buticchi, Emilio Lorenzani, Carlo Concari

Research output: Journal PublicationArticlepeer-review

73 Citations (Scopus)

Abstract

This paper proposes a solution for reducing the ground leakage current in transformerless single-phase grid-connected photovoltaic converters. This is obtained with the introduction of an active common-mode filter able to compensate for variations of the output common-mode voltage of the power converter. The active common-mode filter is applied to a widespread and efficient full-bridge driven by a three-level pulse width modulation, allowing the power converter to operate with low ground leakage current and with an arbitrary power factor. After showing the desired voltage waveform for common-mode voltage compensation, this paper presents the design guidelines for the needed additional magnetic component together with the power loss considerations for all the devices added for the proposed solution. Experimental results show the performance of the proposed solution in terms of ground leakage current reduction, effectiveness of dead-time compensation, total harmonic distortion of the injected grid current, and power losses.

Original languageEnglish
Article number6616574
Pages (from-to)3940-3950
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume61
Issue number8
DOIs
Publication statusPublished - 1 Aug 2014
Externally publishedYes

Keywords

  • Active filters
  • leakage current
  • photovoltaic systems
  • pulsewidth modulation inverters

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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