Study of Fault Ride-Through Capability of Doubly Fed Induction Generator Based Wind Turbine

With the high penetration of Renewable Energy Resources (RER's) especially PV solar and wind farms in power systems, fault ride through capability studies of RER's integrated with distribution grid systems have become much more important considering high variability of these sources and hence it affects the requirement of supply and stable operation of the system. The integration of RER's into national grids must include a plan for providing voltage assistance during disturbances in order to maintain system stability. To enforce system reliability, various countries have implemented technical grid code requirements for RERs integration into power system to preserve grid stability, i.e., the limit of voltage, frequency variations, the total harmonic distortions, etc. Furthermore, RERs must stay attached throughout fault situation and provide voltage recovery support. This paper presents fault ride-through capabilities of a doubly fed induction generator (DFIG) based wind turbine integrated with a grid system. The MATLAB/Simulink platform is used to simulate the system. Simulation results show the ability of injection and absorption of reactive power during the fault events to return the system stability in a much faster way. Hence, reactive power injection overcome the voltage sags occurring in the grid system and the application results verify the usefulness of the present work.