Fault Ride through Capability Improvement of the DFIG-Based Wind Turbine in Microgrid

Using of DFIG-Based wind turbine in distribution network is increasing day by day. Despite different advantages of DFIG such as ease controllability, low cost and ability to work in different wind speeds, they are very sensitive to the grid voltage drop and when a fault occurs, the rotor current is increased and this may leads to damage the DFIG power electronics converters. Also, voltage swell caused by large loads switching off, large capacitor banks energizing and unbalanced faults may damage the DFIG converters. Dou to necessity of compliance of grid codes, a novel approach is proposed in this paper to improve the low voltage ride through (LVRT) and high voltage ride through (HVRT) capability of the DFIG in microgrid by using superconducting magnetic energy storage (SMES) and superconductive fault current limiter (SFCL), simultaneously. The simulation is carried out by using PSCAD/EMTDC software and the simulation resultsillustrate the effectiveness of proposed approach to improve fault ride through capability of DFIG in microgrid during voltage swell and voltage sag.