A high performance T-type single phase double grounded transformer-less photovoltaic inverter with active power decoupling

Yinglai Xia, Jinia Roy, Raja Ayyanar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

14 Scopus citations

Abstract

Transformer-less PV inverters are gaining widespread applications with lower cost, reduced footprint, and improved efficiency. This paper proposes a topology that can eliminate the common mode leakage current which is a major challenge in transformer-less PV inverters. In addition, an active power decoupling strategy is implemented in this topology instead of using large energy storage element for double line frequency power decoupling, thus achieving a smaller volume. A constant input voltage with negligible double line frequency ripple component ensuring high MPPT efficiency is achieved in this topology. Compared to the previously proposed topology, a T-type branch is added as an improvement to fully take advantage of the inherent three level structure resulting in much reduced switching loss and inductor current ripple. A 1 kW, 100 kHz single-phase prototype with 200 V DC input and 120 V/60 Hz AC output using SiC MOSFETs has been built to validate the theoretical analysis. The control strategy and modulation scheme are implemented in DSP TMS320F28335 resulting in 24% reduction in the total loss and 50% reduction in the inductor current ripple.

Original languageEnglish (US)
Title of host publicationECCE 2016 - IEEE Energy Conversion Congress and Exposition, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509007370
DOIs
StatePublished - Feb 13 2017
Event2016 IEEE Energy Conversion Congress and Exposition, ECCE 2016 - Milwaukee, United States
Duration: Sep 18 2016Sep 22 2016

Other

Other2016 IEEE Energy Conversion Congress and Exposition, ECCE 2016
CountryUnited States
CityMilwaukee
Period9/18/169/22/16

Keywords

  • common mode leakage current
  • power decoupling
  • Transformerless PV inverter

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Control and Optimization

Fingerprint Dive into the research topics of 'A high performance T-type single phase double grounded transformer-less photovoltaic inverter with active power decoupling'. Together they form a unique fingerprint.

  • Cite this

    Xia, Y., Roy, J., & Ayyanar, R. (2017). A high performance T-type single phase double grounded transformer-less photovoltaic inverter with active power decoupling. In ECCE 2016 - IEEE Energy Conversion Congress and Exposition, Proceedings [7854693] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2016.7854693