Abstract: In order to solve the nonlinear power oscillation problem in doubly-fed induction generators when they are integrated into power systems,a power oscillation damping controller featuring nonlinearity and robustness is proposed to reduce the power oscillation.Firstly,the energy function model of the power system containing wind power is constructed by factoring in the characteristics of the doubly-fed induction generator. Secondly,the sliding mode surface is created based on the constructed stable flow form. In this phase,a few errors and external disturbances in the modeling and simulation process are estimated with the use of an extended state observer.Finally,the power oscillation damping controller of the doubly-fed induction generator is designed based on three factors:the extended state observer,the sliding-mode variable structure control theory,and the energy function. The proposed method effectiveness is verified through the four-machine two-area test system.