基于MRAS的无传感器变速恒频双馈风力发电系统研究

he technique of variable speed constant frequency (VSCF) using Double-Fed Induction Generator (DFIG) becomes the main trend in the field of wind power generation. At first, the basic principle of electromechanics was described to analyze the operation principle of Double-Fed inductor motor。Then a P-Q decoupled vector control scheme for VSCF wind power generation system is proposed in this paper. The rotor speed and position are estimated by model reference adaptive system(MRAS), so the speed and position sensors can be ignored and the system cost will be reduced. By applying the Popov stability theory, the rotor speed and timeconstant adaptive law are derived. The speed can be estimated accurately by the system, and the system shows strong robustness to speed var- iation of motor parameters.The simulation results verify the validity of the proposed strategy.