Fuzzy Logic Control Algorithm of Grid Connected Doubly Fed Induction Generator driven by Vertical Axis Wind Turbine in Variable Speed

Abstract

This paper deals with a fuzzy logic control algorithm intended for grid-connected doubly fed induction generator (DFIG) which is driven by a Savonuis vertical axis wind turbine. The established control system is based on decoupling control using oriented grid flux vector control strategy. However a decoupling between active and reactive stator powers is carried out which gives an optimal operation of the DFIG at sub-synchronous region. Also the control of the stator powers works simultaneously with possibility to keeping stator power factor at unity. The power controllers are designed from an optimized fuzzy logic algorithm, which conducts to an efficiency for the controllers behavior. In addition a maximum power point tracking strategy is included as an additional solution to enhance and improve the wind energy conversion system efficiency.