Research on speed sensorless control of doubly FED wind power generator

A novel speed sensorless vector control strategy of doubly fed induction generator (DFIG), which was based on model reference adaptive control (MRAC) method was proposed. Due to the operation characteristic of DFIG, two close-loop control strategies were adopted to estimate the rotor speed and position based on the generator grid-connect condition, respectively. Before the grid connection, the rotor speed and position were estimated through the q axis component of generator stator voltage. When the generator was connected to the grid, the MRAC method based on the electromagnetism relationship of DFIG was used to estimate the rotor speed and position. The proposed control strategies were implemented on a simulation platform for DFIG wind power generation system. The proposed theory was verified by experiment results.