Subsynchronous oscillation suppression of doubly-fed induction generator based on equivalent input disturbance

In order to suppress the new type of sub-synchronous oscillation generated by the interaction of sub-synchronous control and make the system quickly reach to a stable state, this paper proposes a generalized harmonic current compensation suppression method (active power filter) based on equivalent input disturbance (EID), which is used to suppress the sub-synchronous oscillation of the series compensated wind farm of doubly-fed wind turbine. The results show that the proposed method can improve the stability of the system, suppress the non-periodic interference, improve the robustness of the APF controller and improve the APF compensation effect when the subsynchronous oscillation of system occurs. Finally, the effectiveness and feasibility of the control method are verified by simulation.