Modified Virtual Oscillator-Based Operation of Grid-Forming Converters with Single Voltage Sensor: Preprint

Research output: Contribution to conferencePaper


This paper proposes a virtual oscillator-based control architecture for a grid-forming converter with an inner current control loop. In general, the virtual oscillator is based on a Lienard type of oscillator equation with a cubic nonlinearity. A virtual oscillator alone cannot accommodate unbalanced or harmonic mitigation while operating converters in grid-forming mode. Therefore, to accomplish better tracking performance, incorporating the provision for nonlinear and/or unbalanced loads, an inner current control loop is utilized that is based on the Lyapunov energy function type control architecture. To reduce the overall cost of implementation and ensure proper phase difference in the generated voltages, the implemented virtual oscillator operates with only one voltage feedback from the point of common coupling. To verify the effectiveness of the proposed approach, the overall system has been modeled in MATTLAB/Simulink and PLECS domain. This paper also presents case studies showing the successful production of low harmonic load voltages under nonideal loading conditions, along with other important results.
Original languageAmerican English
Number of pages8
StatePublished - 2023
EventEnergy Conversion Congress and Expo (IEEE-ECCE) - Nashville, Tennessee, USA.
Duration: 29 Oct 20232 Nov 2023


ConferenceEnergy Conversion Congress and Expo (IEEE-ECCE)
CityNashville, Tennessee, USA.

Bibliographical note

See NREL/CP-5D00-88810 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5D00-85362


  • dual second order generalized integrator
  • nonlinear/unbalanced loads
  • photovoltaic system
  • point of common coupling
  • single voltage sensor
  • three-phase grid forming inverter


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