An autonomous frequency and voltage controller for standalone doubly fed induction generator

This paper presents an autonomous frequency and voltage control strategy for a standalone doubly fed induction generator (DFIG). The main aim of this study is to keep stator frequency as well as stator voltage at the desired value under different load and variable wind speed conditions without using position sensor. The proposed sensorless method is based on the detection of the stator frequency and it is designed to operate without a knowledge of any parameter of the DFIG. Hence, the proposed sensorless method can be operated as a model-free. A proportional-integral (PI) controller is used to control rotor currents as well as stator voltage. Simulation studies were performed to verify the dynamic and steady-state performances of the proposed control strategy under different operating conditions. The results show that the proposed strategy not only has an excellent steady-state and dynamic performance, but also exhibits robustness against wind speed and load variations.