新颖的双馈风力发电机灭磁控制策略

he grid voltage mutation will cause doubly-fed generators output power fluctuations and electromagnetic torque vibration. The root reason of these electromagnetic oscillation is the stator flux transient dc component reacted in the stator winding. This paper analyzes the stator flux linkage transient components and deduced the mathematical expression between stator flux and rotor current. Based on this, a novel suppressed magnetic control method of doubly-fed wind-driven generator orientated by stator flux vector control is presented. Simulation results confirm that the proposed method can effectively reduce the effect caused by the stator flux linkage transient dc component, and improve the stability of doubly-fed wind power system when grid voltage dips a little. This is helpful to improve the LVRT capability of DFIG wind system.