Investigation on the Modeling of Doubly-Fed Induction Generators for Wind Turbine

Abstract

Over recent decades, especially in the transmission network, the share of electricity produced by wind sources has significantly increased. In order to enhance the efficiency of the power system, it is crucial to have precise and comprehensive mathematical modeling of the generator for wind turbine systems. Typically,
this generator is a doubly-fed induction generator, as its use of partial converters and induction machines makes it more economically successful compared to alternative technologies. In this paper, a novel approach has been developed for the modeling and analysis of doubly-fed induction generators. This thorough approach takes into account the derivation of the neutral voltage of the doubly-fed induction generator. This innovative approach has successfully extracted the fundamental harmonic of the stator currents and voltages with precision under normal operating conditions within a reasonable simulation time. It has been demonstrated that under normal operating conditions, a typical operation is achieved. It is characterized by a balanced stator voltage, current, flux, and fundamental harmonic through the stator variables, which correspond to the supply frequency. This fundamental harmonic has been suggested as a means of monitoring the generator during normal operating conditions. Mathematics modeling and simulation are conducted using MATLAB software.
The validity and dependability of this method for analyzing and modeling doubly-fed induction generators are
confirmed by the consistency and strong correlation between experimental and simulation results.