Using an FCL for the Improvement of the DFIG_WT LVRT Capability

Abstract

Fault ride through (FRT) ability is a critical criterion for the amelioration of WT availability under various operating situations. In order to enhance the FRT capabilities of grid-connected WT, an adaptive fault current limiter (FCL) topology is proposed in this study. An ideal resistor associated to a four Diodes Bridge connected to the grid makes up the proposed FCL. The voltage sag level is used to calculate the value of the optimum resistor in the FCL. In order to create an adaptive voltage sag compensation mechanism based on the pre-fault active power, these latter are introduced into the fault path.