Power Quality Improvement for Grid Connected Wind Energy Generation System by Implementation of DFIG scheme

Abstract

The doubly fed induction generator (DFIG) is used in most of the wind energy conversion system (WECS), due to its numbers of advantage for fulfilling the condition of variable speed and running above the synchronous speed. This characteristic will avoid harming the wind turbine mechanism, this system is very good when the actuated wind speed is above the rated speed. In this paper, we will present the contribution of wind power system in mitigation of power Emergency, to analysis the performances of different types of generators used in wind form, solutions to improve the Power quality of Grid connected wind energy generation system, and to generate a constant frequency from the variable speed operation of the shaft using the traditional PI. Implementing DFIG will allow constant amplitude and frequency at stator even if the wind speed is varying i.e., variable speed constant frequency operation. It also helpful to generate even at lower wind speed. It is applicable on a speed range of ± 30% around the synchronous speed.It uses a reduced rated AC/DC/AC bidirectional converter (25-30% of total rating), by implement the above controllers in MATLAB/SIMULINK.