A Voltage Sensorless Current Control for Inverters Connected to Distorted Grid Voltages

Abstract

In this paper a sensorless cur- rent control for grid connected inverters is pre- sented. The use of a grid voltage sensor is avoided, estimating the fundamental compo- nent and the harmonic content of the grid volt- age via a reduced order observer. The proposed observer is frequency adaptive. The current control scheme is realized through a propor- tional resonant algorithm, using a scaled ver- sion of the estimated grid voltage fundamental component as current reference. The control algorithm is made frequency adaptive using the estimated frequency provided by the proposed observer. Simulation results are presented to validate the proposed scheme.