High voltage ride through with FACTS for DFIG based wind turbines

In future grid codes wind farms will have to fulfill demanding fault ride through requirements. Among several grid faults the voltage swell is a critical event. Wind farms with doubly-fed induction generators will not be able to fulfill the new grid code requirements without additional fault mitigation equipment. In this publication the applicability of the dynamic voltage restorer and the static synchronous compensator to mitigate a three phase voltage swell without phase angle variation at a wind turbine is investigated and compared. The mitigation equipment adds the missing high voltage ride through capability to the wind energy system in order to become grid compliant. The function, control structure and design and the performance is presented and verified by simulations.