Synchronization of parallel single-phase inverters with virtual oscillator control

Brian B. Johnson, Sairaj V. Dhople, Abdullah O. Hamadeh, Philip T Krein

Research output: Contribution to journalArticlepeer-review

Abstract

A method to synchronize and control a system of parallel single-phase inverters without communication is presented. Inspired by the phenomenon of synchronization in networks of coupled oscillators, we propose that each inverter be controlled to emulate the dynamics of a nonlinear dead-zone oscillator. As a consequence of the electrical coupling between inverters, they synchronize and share the load in proportion to their ratings. We outline a sufficient condition for global asymptotic synchronization and formulate a methodology for controller design such that the inverter terminal voltages oscillate at the desired frequency, and the load voltage is maintained within prescribed bounds. We also introduce a technique to facilitate the seamless addition of inverters controlled with the proposed approach into an energized system. Experimental results for a system of three inverters demonstrate power sharing in proportion to power ratings for both linear and nonlinear loads.

Original languageEnglish (US)
Article number6692879
Pages (from-to)6124-6138
Number of pages15
JournalIEEE Transactions on Power Electronics
Volume29
Issue number11
DOIs
StatePublished - Nov 2014

Keywords

  • Distributed ac power systems
  • inverters
  • microgrids
  • nonlinear control
  • oscillators
  • synchronization
  • uninterruptible power supplies
  • voltage source inverters

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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