Virtual Oscillator Control of Equivalent Voltage-Sourced and Current-Controlled Power Converters

Daniel F. Opila, Keith Kintzley, Spencer Shabshab and Stephen Phillips
Additional contact information
Daniel F. Opila: Department of Electrical and Computer Engineering, United States Naval Academy, Annapolis, MD 21402, USA
Keith Kintzley: Department of Electrical and Computer Engineering, United States Naval Academy, Annapolis, MD 21402, USA
Spencer Shabshab: Department of Electrical and Computer Engineering, United States Naval Academy, Annapolis, MD 21402, USA
Stephen Phillips: Department of Electrical and Computer Engineering, United States Naval Academy, Annapolis, MD 21402, USA

Energies, 2019, vol. 12, issue 2, 1-18

Abstract: The dynamics of a general class of weakly nonlinear oscillators can be used to control power converters to create a self-forming AC network of distributed generators. Many control stability results for these “virtual” oscillators consider the interaction of voltage-source converters, but most practical converters use a nested current loop. This paper develops a general method to extend voltage-source stability results to current-controlled converters using a virtual admittance. A fast current control loop allows a singular perturbations analysis to demonstrate the equivalence of the two. This virtual admittance can also manipulate load sharing between converters without changing the core nonlinear dynamics. In addition, Virtual Oscillator Control is experimentally demonstrated with three-phase voltage-sourced and current-controlled inverters. This validates the equivalence of the two formulations, and extends previous single phase testing into three phases. The extension to current-controlled converters enhances safety and increases the breadth of applications for existing control methods.

Keywords: coupled oscillators; virtual impedance; synchronization; power converters; droop control; virtual admittance; distributed generation; energy; renewable energy; microgrids (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1996-1073/12/2/298/pdf (application/pdf)
https://www.mdpi.com/1996-1073/12/2/298/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:12:y:2019:i:2:p:298-:d:198900

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().