Sensorless Speed Control of Doubly Fed Induction Generator in Wind Turbine

This paper presents a new contribution the domain of sensorless speed control of doubly-fed induction generator in wind turbine applications. Where the speed and the dynamic torque are estimated and used to feedback the control loops. The proposed sensorless algorithm is robust to variations of the values of machine parameters where the estimated speed is independent of them. The algorithm avoids using differentiation which significantly improves its immunity to noise. The field oriented vector control theory is used to control the speed of the doubly fed induction machine. The used controllers in closed loops are classical proportional integral (PI). The modeling is based on the Park equations of the induction machine and on a simple model of the three phase inverter. The results of simulink on MATLAB provide good performance of the sensorless speed control.