A New Virtual Oscillator Control without Third-Harmonics Injection for DC/AC Inverter

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

24 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)10879-10888
Journal / PublicationIEEE Transactions on Power Electronics
Volume36
Issue number9
Online published17 Mar 2021
Publication statusPublished - Sept 2021

Abstract

Virtual Oscillator Control (VOC) is a type of nonlinear grid-forming controller for DC/AC inverters. Compared with the droop control method, the original VOC has a faster transient response in islanded mode. However, its output voltage always contains a third-order harmonic, resulting in a significant third-harmonic current, especially in the grid-connected mode. In order to eliminate this harmonic, a notch-type filter is typically employed, but it affects the synchronization speed of multiple DC/AC inverters connected in parallel in islanded mode. In this paper, by analyzing the nonlinear dynamical equations of the oscillator and simplifying its nonlinear current source, a novel VOC for four-line three-phase DC/AC inverters is proposed, which can successfully eliminate the third-order harmonic in the output voltage of the oscillator. Further, compared with the traditional VOC with notch filter, the grid-synchronization response of the proposed VOC-based DC/AC inverters can be significantly improved. A 3 kW/3-phase/120 V experimental prototype system designed on the DSPACE DS1202 platform has been developed to verify the feasibility of the proposed control strategy.

Research Area(s)

  • grid synchronization, Harmonic analysis, harmonic elimination, Inductors, Inverters, Microgrids, Oscillators, Power harmonic filters, Synchronization, virtual oscillator control

Citation Format(s)

A New Virtual Oscillator Control without Third-Harmonics Injection for DC/AC Inverter. / Luo, Siyi; Wu, Weimin; Koutroulis, Eftichios et al.
In: IEEE Transactions on Power Electronics, Vol. 36, No. 9, 09.2021, p. 10879-10888.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review