A sequence components estimation technique applied for distributed generation

Abstract

This paper proposes to apply an instantaneous sequence estimation technique to enhance the control systems applied in distributed generation. It relies on a recursive least-square estimation of the αβ voltage components which are directly linked to the sequence components. The method was originally proposed to serve a dynamic voltage restorer controller. Here, this technique has been expanded to improve it robustness with regards to harmonic distortions, presented on the point of common coupling (PCC) between the mains and the distributed generator. The technique has been tested on synthetic signals and on signals produced through a simulation of a grid-connected inverter. The results endorse the proposed technique.