Analysis of stator active and reactive power in a doubly fed induction generator

Abstract

The thesis studies about the stator active and reactive power variation of a Doubly fed Induction generator (DFIG) at certain rotor speeds by using rotor side converter control technique. Nowadays, DFIG finds use in a wide range of application, specially in renewable energy sector due to its special case wherein it can operate at a variable speed. The speed of the generator can be above or below the synchronous speed. Hence DFIG can be used at variable slip speeds, and finds extensive use in variable speed wind turbines. Earlier, wind turbines used to work at a single speed. But the very purpose of wind turbine requires it to work at different speeds according to the speed of the wind at that time. Hence the idea of using DFIG in wind turbines was introduced. The study of variation of active and reactive power is essential since the wind turbine is used mostly to provide power to the grid, hence enhancing the use of green renewable energy