Improved LVRT/HVRT Capability Of DFIG Wind Turbine Using DVR

Abstract

This paper proposes a method that improved the efficiency of a doubly fed induction generator (DFIG) in the case of network voltage imbalance. In the suggested configuration, a dynamic voltage restorer (DVR) is combined in series to the terminal system allowing compensating two types of fault LVRT/HVRT. The DVR device has the ability to compensate the stator voltage by injecting the appropriate at the stator that leads to keeping the generator terminal voltage at the normal level and improving the fault ride-through (FRT) ability of DFIG. Simulations in MATLAB/Simulink for a DFIG are used to verify the efficiency of the suggested control method on both types of faults.