Wind turbine with flywheel for improved power smoothening and LVRT

In a scenario where renewable energy will be playing a very important role in the way the power system behaves, especially wind energy, the requirement is to make the wind energy conversion systems as flexible and controllable as other conventional generation. Such an effort is taken up in this paper, where a doubly fed induction generator (DFIG) is coupled with energy storage to provide low voltage ride through (LVRT) and power smoothening .With modified controls of the DFIG and the flywheel, which acts as the energy storage system, it achieves a very smooth regulated power output and prolonged LVRT. The power regulation is evident even during the fault duration where it helps to keep the dc voltage constant .The simulation work has been done in DIgSILENT Powerfactory.