Power quality enhancement of wind farm based on DFIG entirely interfaced with distribution network during symmetrical and unsymmetrical voltage faults

Abstract

The purpose of this paper is to describe a novel approach for voltage control of radial electrical distribution network with connected wind farm in presence of symmetrical and unsymmetrical faults. The proposed method is based on the wind farm induction generators entirely interfaced with the distribution network. The proposed structure performs better than the conventional one due to the ability of the suggested structure to increase the generator power until twice its nominal power. Consequently, the system size and cost are reduced; the disturbances do not affect the doubly fed induction generators (DFIGs) and coupling of these generators to the network is improved. A reliable control strategy for the grid side converter is developed in order to restrain the disturbances caused by grid voltage fault and to ensure the stability of the system, regarding power quality and voltage level. Obtained results show the effectiveness of the proposed method in mitigating the disturbances caused by voltage faults and in minimizing system transmission losses while providing best voltage levels.