A New Virtual Oscillator Control Without Third-Harmonics Injection For DC/AC Inverter

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