An improved control strategy for doubly fed induction wind generators under unbalanced grid voltage swell

作者：Xie, Zhen; Zhang, Xing; Yang, Shuying; Song, Haihua; Qu, Tingyu; Shi, Quanli

来源：Proceedings of the CSEE, 2013, 33(15): 109-118.

• Active resistance
• Double synchronous reference frame
• Doubly Fed Induction generators (DFIG)
• Doubly fed induction wind generators
• High voltage ride through (HVRT)
• Negative sequence components
• Negative-sequence currents
• Unsymmetrical voltages

Grid voltage unsymmetrical swell will cause transient DC flux components and negative sequence components in the doubly fed induction generator (DFIG) stator windings, which will create more serious stator and rotor current and torque oscillations even than voltage dips. This paper analyzed the dynamic behavior of DFIG during unsymmetrical voltage swell. The improved double synchronous reference frame control strategy based on the active resistance manages effective to suppress unbalance of the stator current, the rotor current control structure based on active resistance can suppress the rotor current and torque oscillation, the stator negative sequence current control structure based on active resistance can shorten oscillation transient time of the stator negative sequence current component during the unsymmetrical voltage swell, This paper proposed an improved SRF control strategy to enhance its high voltage ride through capability. This improved method was verified by Simulation and experimental results.

• 出版日期2013
• 单位合肥工业大学