A single phase doubly grounded, PV inverter using coupled inductor with integrated magnetics and active power decoupling technique

Yinglai Xia, Jinia Roy, Raja Ayyanar

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

Abstract

Transformer-less PV inverters are gaining widespread applications with lower cost, reduced footprint, and improved efficiency. This paper builds on a recently proposed topology with doubly grounded structure that can eliminate the common mode leakage current which is a major challenge in transformer-less PV inverters. An active power decoupling strategy is implemented in the above topology for double line frequency power decoupling, thus achieving high power density and improved reliability by use of film capacitors. 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, the DC-DC stage and dc-ac stage inductors are coupled with an integrated magnetics design to take advantage of the currents in the two stages to reduce the flux, core loss and the current ripple. A 500 W, 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 total inductor volume can be reduced by 31%, and the inductor current ripple in the DC-DC stage and dc-ac stage can be reduced by 35% and 50% respectively. The efficiency improves by 0.3% due to savings in the core loss and copper loss compared with topology using discrete inductors.

Original languageEnglish (US)
Title of host publication2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages8-14
Number of pages7
Volume2017-January
ISBN (Electronic)9781509029983
DOIs
StatePublished - Nov 3 2017
Event9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 - Cincinnati, United States
Duration: Oct 1 2017Oct 5 2017

Other

Other9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017
CountryUnited States
CityCincinnati
Period10/1/1710/5/17

Keywords

  • Active power decoupling
  • Coupled inductor
  • Doubly grounded
  • Integrated magnetics
  • Transformer-less PV inverter

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Renewable Energy, Sustainability and the Environment
  • Control and Optimization

Fingerprint Dive into the research topics of 'A single phase doubly grounded, PV inverter using coupled inductor with integrated magnetics and active power decoupling technique'. Together they form a unique fingerprint.

  • Cite this

    Xia, Y., Roy, J., & Ayyanar, R. (2017). A single phase doubly grounded, PV inverter using coupled inductor with integrated magnetics and active power decoupling technique. In 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017 (Vol. 2017-January, pp. 8-14). [8095754] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2017.8095754