Improved control of DFIG based wind power converters during unbalanced and distorted grid voltage conditions

 

 

XV Jianwei1, CHEN Ping1, XV Hailiang2

 

(1.College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255049, China;

 

2.Department of Control Engineering, Academy of Armored Force Engineering, Beijing 100072, China)

 

 

Abstract: Aiming at the problem of the fault ridethrough (FRT) capability of doubly fed 

induction generator (DFIG) based wind turbines during unbalanced and distorted grid voltage 

condition, the influence of the faulty grid to the turbines was analyzed. And then a 

coordinated control method for both the gridand rotorside converters (GSC and RSC) was 

presented. By improving the vector control algorithm of both the GSC and RSC, the DFIGs 

electromagnetic torque oscillations were suppressed and the total power pulsations were reduced. In addition, symmetry and sinusoidal output currents of the turbines could also be obtained. The simulated results indicate that the proposed control can obviously improve the operation performance of DFIG based wind generation systems under such adverse grid conditions and thus enhance the turbines fault ridethrough capability.

 

Key words: doubly fed induction generator (DFIG); converter; unbalanced and distorted grid condition; fault ridethrough (FRT)