Study on speed sensorless control of Brushless Doubly-Fed wind power generator based on flux linkage of the power winding

The Brushless Doubly-Fed Generator (BDFG), which removes the brush and slip ring, is expected to replace the Doubly-Fed Generator as the main wind power generator in the wind power generator in the future. To overcome the disadvantages on control stability and precision for installed speed sensor in the BDFG vector control system, speed sensorless vector control strategy for BDFG power winding two-axis static coordinate mathematical model based on model reference adaptive speed identification theory by observing power winding flux is presented. A simulation model of control system is established under Matlab/Simulink. Simulation results show that this system can realize speed precise estimation in stationary and dynamical circumstances. Theory and simulation verified the feasibility and effectiveness of the control scheme.