Efficiency improvement for wind energy pumped storage systems

Integrating wind energy into the grid may raise stability problems. Solutions for avoiding these situations are studied and energy storage methods are suitable for balancing the energy between the wind turbine and grid. In this paper, an autonomous wind turbine pumped storage system is presented. The focus of this paper is to improve the efficiency of this system, which is small at low power levels. The driving motor-pump group of the storage system is the key point presented in this paper for efficiency improving. Two control methods, experimentally implemented for induction machine are presented, and the comparison of the system efficiencies highlights the improvement of the proposed control method.