LVRT capability assessment of FSIG-based wind turbine utilizing UPQC and SFCL

Abstract

This paper investigates a fixed-speed induction generator (FSIG)-based wind turbines in effective combination with unified power quality conditioner (UPQC) and resistive superconducting fault current limiter (RSFCL). The UPQC control scheme is introduced to ensure the maximum low voltage ride-through (LVRT) enhancement of the FSIG-based wind turbine by compensating the voltage sag at the point of common coupling (PCC). Additionally, a realistic estimation of the voltampere rating requirements of UPQC for this type of application is carried out. In this paper the utilization of RSFCL is proposed to limit excessive current in the event of the fault. For this purpose, the electro-thermal model of the SFCL is implemented in PSCAD/EMTDC software as a component to verify SFCL damping performance. The obtained results confirm that the SFCL can not only reduce the volt-ampere rating of the UPQC, thereby reducing the installation cost but also aid to the LVRT capability improvement of the wind turbine as well as dynamic performance of the induction generator.