With the increasing grid-connected operation capacity of wind turbines, the research on key technologies for their fault ride through (FRT) is becoming more and more urgent. Since the wind turbine with a doubly-fed induction generator (DFIG) is one of the dominant types on the wind power market, researchers have extensively studied the key technologies for the FRT capability of DFIG-based wind turbines. The status quo of researches on the related FRT technologies is reviewed. First, the basic theory of DFIG-based wind turbines is introduced. Then, the analysis methods for the FRT mechanism at present are summed up, and the advantages and disadvantages of different FRT solutions are classified. Finally, the analysis methods and technologies for the FRT of DFIG-based wind turbines are forecasted and summarized.

Wind power generation  /  doubly-fed induction generator (DFIG)  /  fault ride through (FRT)  /  protection