A GaN based doubly grounded, reduced capacitance transformer-less split phase photovoltaic inverter with active power decoupling

Yinglai Xia, Jinia Roy, Raja Ayyanar

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

12 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 which is a common problem in single phase inverters / rectifiers, thus achieving a smaller volume and replacing electrolytic capacitors with film capacitors to increase reliability. A constant input voltage with negligible double line frequency ripple component less than 2% ensuring high MPPT efficiency is achieved in this topology through control strategy. Compared with previous topology, the 120 Hz inductor current ripple in the boost stage is reduced significantly resulting in the decrease of the RMS current value by 14% and the peak current value by 41%. Also the RMS current in the input capacitor is decreased by 91%. The dc link capacitor volume is also decreased with the increase of the voltage level. Finally, a 1 kW, 100 kHz single-phase prototype with 200 V DC nominal input and 120 V/60 Hz AC output in split phase configuration using GaN FETs has been built to validate the theoretical analysis. The control strategy and modulation scheme are implemented in DSP TMS320F28335.

Original languageEnglish (US)
Title of host publication2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2983-2988
Number of pages6
ISBN (Electronic)9781509053667
DOIs
StatePublished - May 17 2017
Event32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017 - Tampa, United States
Duration: Mar 26 2017Mar 30 2017

Other

Other32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017
CountryUnited States
CityTampa
Period3/26/173/30/17

Keywords

  • Doubly grounded
  • Leakage current
  • Power decoupling
  • PV inverter
  • Split phase

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Xia, Y., Roy, J., & Ayyanar, R. (2017). A GaN based doubly grounded, reduced capacitance transformer-less split phase photovoltaic inverter with active power decoupling. In 2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017 (pp. 2983-2988). [7931121] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2017.7931121