Half-Bridge Voltage Swing Inverter with Active Power Decoupling for Single-Phase PV Systems Supporting Wide Power Factor Range

Jinia Roy, Yinglai Xia, Raja Ayyanar

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Photovoltaic (PV) inverters form the backbone of PV generation. This paper proposes an all-film-capacitor, transformerless single-phase inverter for PV application. The topology is a combination of a front-end boost stage, a half-bridge (HB) inverter stage, and a buck-boost power decoupling stage. The grid ripple power is decoupled by a large swing of the HB capacitors along with a limited ripple on the dc link, thus reducing the capacitance requirement and converter volume. Being an HB-derived inverter, the high-frequency common mode leakage current through the PV parasitic capacitance is mitigated. Furthermore, the dc-link average is optimally controlled to ensure a higher efficiency over wide operating load and power factor range. To validate its operation, a Silicon Carbide based 1-kVA laboratory prototype is built and closed-loop experimental results are provided at 100/75 kHz switching frequency over wide operating conditions.

Original languageEnglish (US)
Article number8506447
Pages (from-to)7450-7461
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume34
Issue number8
DOIs
StatePublished - Aug 2019

Keywords

  • Active power decoupling
  • adaptive dc link
  • capacitance optimization
  • common mode leakage current
  • single-phase transformerless string inverter
  • wide bandgap devices

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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