New load frequency control method suitable for large penetration of wind power generations

In this paper, we propose a designing method of a load frequency control using disturbance observer when a large amount of wind power generations are introduced in the power system. We consider the disturbance cancellation problem in the disturbance observer. The disturbance observer estimates disturbances from observable quantities of states, and cancels the effect of the disturbance. By this method, we can suppress the instantaneous power variations of the wind power generations. As an example, we have run simulations for a three-area longitudinal system to compare the proposed method with a conventional method (PI type controller). As the results of the simulations, we can confirm the validity of the proposed method.