Motor pump group efficiency in a wind energy pumped storage system

Pumped storage systems are more and more involved in renewable energy at high power levels. But in the same time, pumped storage can be successfully used for grid integration of small scale renewable energy sources, such as wind energy. The purpose of this paper is motor control analyze for pump driving, in order to obtain maximum power available for pumping and a higher efficiency of the pump. An induction motor control based on cubic dependency between voltage and frequency is proposed for induction machine in pumped storage applications. A comparison between this control and linear classic control V/Hz is realized in order to see the benefits given by this cubic dependency control. Experimental validation of the proposed control method is presented, in contrast with classical scalar control. Motor-pump group efficiency is improved by implementing appropriate control method for the system.