Modeling and model validation for DFIG wind turbines under grid voltage dip

WANG Qing1,2, CHENG Chenguang2, YANG Jing1,2, WANG Hangfeng2, SHEN Han3

(1.State Key Laboratory of Wind Power System, Hangzhou 310012, China; 2.Zhejiang Windey Co.,Ltd, Hangzhou
310012, China; 3.School of Mechatronic Engineering and Automation, Shanghai 200444, China)

Abstract: Aiming at the analysis of the influence of wind power generation on power system stability and need to establish wind power generator model the model for DFIG wind turbine under grid voltage dip was researched and the validity of the model was verified. Firstly, the model of DIFG wind turbine in Power system simulation were developed, which included variablespeed and variablepitch control model, converter model, drive train model, pitch system model, rotor model, doublefed induction generator model, grid model and so on. Secondly, as an example, the WD771500 wind turbine’s model was build in Matlab/Simulink software, and the dynamic response character of the wind turbine under grid fault was simulated and analyzed. Finally, the comparison result of simulation and field test verified the correctness and effectiveness of the model of DIFG wind turbine presented. Model validation results indicate that the model is suitable for the wind farm model and research on the power system stability, and has important engineering application value.

Key words: DFIG wind turbines; low voltage ridethrough; model validation; grid fault; variablespeed and variablepitch