STATOR HARMONIC CURRENT COMPENSATION METHOD FOR DFIG CONNECTED TO A DISTORTED GRID THROUGH PROPER ADJUSTMENT OF LINEAR ROTOR CURRENT CONTROLLERS

GUSTAVO  FIGUEIREDO GONTIJO; THIAGO  CARDOSO TRICARICO; FELIPE  DICLER; MATHEUS  SOARES DA SILVA; LEONARDO  FRANCISCO DA SILVA; MAURICIO  AREDES

doi:10.20906/CBA2022/213

GUSTAVO FIGUEIREDO GONTIJO Universidade Federal do Rio de Janeiro
THIAGO CARDOSO TRICARICO Universidade Federal do Rio de Janeiro
FELIPE DICLER Universidade Federal do Rio de Janeiro
MATHEUS SOARES DA SILVA Universidade Federal do Rio de Janeiro
LEONARDO FRANCISCO DA SILVA Universidade Federal do Rio de Janeiro
MAURICIO AREDES Universidade Federal do Rio de Janeiro

DOI: https://doi.org/10.20906/CBA2022/213

Keywords: DFIG, Stability analysis, Harmonic current compensation

Abstract

The DFIG is highly attractive to the wind power industry due to its technical and economic
advantages. However, the fact that its stator is directly connected to the electrical grid leads to serious power
quality issues that are making the DFIG market share reduce, considerably, in the last few years. For instance, if
the grid voltage is distorted the generator stator current will be distorted leading to loss in the system eciency, to undesired torque pulsations and the system might be unable to comply with grid codes regarding harmonic current injection. Many dierent control strategies and converter topologies have been proposed aiming at mitigating these harmonic currents. Most of the techniques are based on the addition of extra, dedicated controllers besides the usual linear controllers that regulate the rotor current fundamental component. This paper develops a stability analysis, based on the linear control theory, aiming at designing the usual rotor current controllers in such a way that they are enough to compensate for stator harmonic current components. In other words, the linear controllers will be designed so that they have a frequency response characteristic that both maintain their good dynamic behavior and compensate for stator harmonic currents.