Differential flatness for smooth transition between grid-connected and standalone mode of three-phase inverter

Abstract

In this paper, the use of flatness based control to achieve smooth transition between Grid Connected (GC) and Stand-Alone (SA) is investigated. The idea is to exploit the flatness proprieties to ensure smooth transition between GC and SA modes. The flatness control uses planned flat outputs to calculate the inverter controls that achieve disturbances rejection. The design of the proposed control is detailed and its effectiveness is evaluated.