Particle Swarm Optimized Phase Shifted DVR (PSDVR) for High Voltage Ride through in DFIG

Doubly fed Induction Generators have gained attention among wind power manufacturers across the globe, owing to its benefits of partially rated converters and stable performance during variable wind speed conditions. DFIGs are very sensitive to grid voltage sag or swell conditions. The low voltage ride through of DFIG during voltage sag has been a sensitive area of research for the past decade. A more serious issue now gaining interest among researchers world-wide is high voltage ride through (HVRT) of DFIG based wind farms. A sudden disconnection of connected inductive load or transformers or improper switching can lead to the voltage swell condition of grid connected DFIG. The rise in voltage has its effects on the stator flux and current of DFIG and its consequences on the magnetically coupled rotor and its converters. HVRT is a relatively new area of research and the various possibilities of HVRT technologies are still being investigated. This paper proposes a promising solution for HVRT of DFIG using Phase Shifted Dynamic Voltage Restorer (PSDVR) with governing equations and design considerations. The simulation is carried out in MATLAB/SIMULINK and the obtained results justify the analogy of Phase Shifted DVR for HVRT in DFIG. The DVR controllers are optimized using Particle Swarm Optimization (PSO) algorithmic MATLAB.