Minimization of Impact of Disturbances on Performance of Utility Grid with Wind Energy Penetration Using Battery Energy Storage Device

Penetration Level of wind energy in utility grid is continuously increasing and achieved significant level compared to the conventional generators. Most of the wind mills uses doubly induction generator (DFIG). The power electronic converters used for interfacing DFIG based generators to utility network are non-linear in nature. Further, variability of wind energy generation also deteriorates quality of power in grid. Any disturbance developed in the grid affects system parameters and power flow due to non-linearity of system and variability of wind generation. This enforces to take suitable action to minimize effects of disturbances on the grid parameters to improve the performance of network in presence of wind generation. In this paper an approach is presented to minimize effects of grid disturbances on utility network with wind energy and improve the performance. This is achieved by application of battery storage device incorporated in to the dc link capacitor of Distribution static compensator (DSTATCOM). DSTATCOM control is implemented with the help of synchronous reference frame theory. This helps in optimized exchange of active and reactive powers between utility grid and dc bus. Test network consisting of five buses, one generator, loads and one wind generator rated at 1.5 MW is utilized to establish effectiveness of proposed scheme.