Study on output power oscillation characteristics of a doubly-fed unit when operating parameters change

Abstract To study the power propagation of wind turbines in doubly-fed unit and output oscillation characteristics after transformation. Firstly, damping was changed when velocity lower than rated higher respectively, considering tower shadow effect shear, were studied. Finally, modeling simulation carried out on PSCAD/EMTDC platform. Through analysis fluctuation spectrum change unit, it is concluded that turbine input greater or less through has different effects unit. The units are with without shear. When negatively damped shear taken into account, contains both low-frequency sub-synchronous oscillations, magnitude frequency components related to control parameters