A photovoltaic array transformer-less inverter with film capacitors and silicon carbide transistors

Lloyd Caleb Breazeale, Raja Ayyanar

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

A new photovoltaic (PV) array power converter circuit is presented. This inverter is a transformer-less topology with grounded PV array and only film capacitors. The motivations are to reduce circuit complexity, eliminate leakage ground currents, and improve reliability. The use of silicon carbide (SiC) transistors is the key enabling technology for this particular circuit to attain reasonable (>97%) efficiency. Some background about the challenges of ground currents and power decoupling to be addressed is first discussed. The proposed solution of a bidirectional buck boost converter, dynamically varying dc link, and half-bridge inverters is then presented along with details on the basic functionality. Some aspects of selecting passive components for the circuit are discussed. The average dynamic model and control system are then presented. Finally, simulation and experiment results are shown demonstrating that the proposed topology is a viable solution.

Original languageEnglish (US)
Article number6815697
Pages (from-to)1297-1305
Number of pages9
JournalIEEE Transactions on Power Electronics
Volume30
Issue number3
DOIs
StatePublished - Mar 2014

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Keywords

  • Double grounding
  • photovoltaic (PV)
  • power decoupling
  • silicon carbide (SiC) MOSFETs
  • single-phase inverter
  • transformer-less inverter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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