Doubly Fed Induction Machine speed drive for hydro-electric power station

The main idea of this paper is to use a variable rotation speed operating mode for a doubly fed induction machine (DFIM) associated with a reversible hydraulic turbine/pump device. The optimal efficiency of the energy conversion of this system is required. A high voltage power inverter supplies the DFIM rotor windings and it allows the rotor currents control. The control expressed in this paper enables to impose active and reactive powers exchanged between the stator side and the electrical supply network. Simulation results show pump and turbine working in steady state and in transient one (starting and speed evolutions). Finally, the authors propose to study the adequate size of the high voltage power inverter.