Study Of Wind Energy Conversion System Connected To Grid Using Doubly Fed Induction Generator

Abstract

From past few years, wind mills has become one of the most significant and valuable sources of renewable energy, in which better transmission capability and improved system reliability is needed. Also there has been a significant growth in the wind energy scenario. The World Wind Energy Association has told in World Wind Energy Report that, “The around the world [wind] capacity reached 318,137 MW, out of which 35,467 MW were added more”. The wind system here is a variable speed wind generation system working principle based on Doubly Fed Induction Generator (DFIG).The Doubly fed induction generator brings the additional feature of utilizing the turns ratio of the machine, so the power converter need not to be rated for the machine’s full rated power. The rotor side converter (RSC) generally provides active power and reactive power control of the machine while the grid-side converter (GSC) retains the voltage of the DC-link constant. The added feature of generation of the reactive power by the grid-side converter is generally not used because of the fact that it is more desirable to generate reactive power by using the Rotor side convertor. Though, within the usable current capacity the grid side converter can be controlled to participate in generation of reactive power in steady state and during low voltage durations as well. The Grid side convertor can contribute the necessary reactive current very quickly while the RSC passes the current through the machine appearing in a difficulty. The pair of converters can be overburdened for a short time, so the DFIG is able to give an ample contribution to grid voltage support at the time of short circuits. This abstract deals with the introduction of wind turbines, DFIG, power converter control and for study of Grid Connected Wind Energy system with DFIG and corresponding results.
DOI: 10.17762/ijritcc2321-8169.150668