Doubly Fed Induction Generator Based Wind Energy Conversion System under Voltage Dips

Abstract

The main of this project is operation of doubly fed induction generator (DFIG) with an integrated active filter capabilities using grid-side converter (GSC). In this system DFIG, the reactive power for the induction machine has been supplied from the RSC and the load reactive power has been supplied from the GSC. The decoupled control of both active and reactive powers has been achieved by RSC control. The proposed DFIG has also been verified at wind turbine stalling condition for compensating harmonics and reactive power of local loads. The main contribution of this work lies in the control of GSC for supplying harmonics in addition to its slip power transfer.

In extension the application of a dynamic voltage restorer (DVR) connected to a wind-turbine-driven doubly fed induction generator (DFIG) is investigated. The setup allows the wind turbine system an uninterruptible fault ride-through of voltage dips. The DVR can compensate the faulty line voltage, while the DFIG wind turbine can continue its nominal operation as demanded in actual grid codes.