Direct and indirect control of a Doubly Fed Induction Generator wind turbine including a storage unit

To solve intermittent availability of popular renewable energy source based on wind energy, this paper deals with the design, analysis and simulation of a wind turbine associated with a storage unit to generate a constant active power through the grid for all wind conditions. A doubly fed induction generator allowing a large speed variation and so a large range of wind is employed. The incorporation of a battery or other energy storage device in the DC link enables temporary storage of energy. Two control methods of the DFIG, so called "direct" and "indirect", are studied and validated by simulation. We demonstrated the large interest of energy storage in such wind energy conversion system. More, in the case of indirect control method, the same DFIG could be used as a doubly fed electric generator/active filter