Effect of wind variation on wind turbine generator dynamics in power system planning stability studies

To study the effect of wind variation on wind turbine generator (WTG) dynamics, numerical experiments are performed for four WTG devices based on a doubly-fed induction generator. Simulations use the PSS/E dynamic program, real power system planning databases and vendor-specific WTG stability models. Experiments for normal operation and fault conditions have shown that wind variation can cause WTGs to go into low-frequency oscillations (in particular, with frequency below the first natural frequency of the mechanical drive train) and/or to trip. If study findings are confirmed by analyses with more detailed, EMTP-type WTG models and by real equipment tests, wind variation may need to be accounted for in power system planning stability studies.