Harmonic Emulator Design Based on a Back to Back converter for an Eolic System

Abstract

This paper proposes the analysis and design of a three-phase back to back converter and a controller whose objective is to operate as a harmonic emulator, in which the main objective is to generate the principal low order harmonics found in the electrical grid. It was considered that the harmonics emulator is part of a wind energy conversion system based on a double fed induction machine. A control law is proposed; the objective is to obtain three-phase voltage with the principal low order harmonics, according to the reference signals. These references set parameters as harmonic order and amplitude. Apart from the back to back analysis, low pass filter analysis is shown to couple the machine and the converter. Finally, simulation results are presented with satisfactory results.