Supplementary control of DFIG for inter-area oscillation damping

This paper presents a supplementary control of doubly-fed induction generator (DFIG) to damp the inter-area oscillation. Firstly, the small signal dynamic model of DFIG is established. Secondly, a supplementary damping controller of DFIG is investigated. Two input signals are selected, one is the tie-line power measured from the local area and the other is the voltage phase angles obtained from the Wide Area Measurement Signals. Considering the capability of decoupled active power and reactive power control of DFIG, the supplementary damping controller is added to the active power control loop and reactive power control loop separately, and the effects of the control are analyzed. Finally, the proposed controller's performance is accessed through eigenvalue analysis and time domain simulation.