1Control of DFIG based Wind Generation to Improve Inter-Area Oscillation Damping

Abstract—Power systems with high penetration of wind power usually require long-distance transmission to export wind power to the market. Inter-area oscillation is an issue faced in long distance transmission. Can wind generation based on doubly fed induction generator (DFIG) help to damp oscillations and how? In this paper, a control scheme is developed for the DFIG with rotor side converter to damp inter-area oscillations. The DFIG is modeled in Matlab R©/Simulink utilizing its vector control scheme feature, and inner current control and outer active/reactive power control loops are modeled and designed. A two-area system that suffers from poor inter-area oscillation damping along with a wind farm in the area that exports power is investigated. A damping controller is designed and time-domain simulations are used to demonstrate the effectiveness of the controller. The major contributions of the paper are as follows: 1) Built a wind farm inter-area oscillation study system based on the classical two-area four-machine system, 2) Established that in vector control scheme, active power modulation can best help to damp oscillations, 3) Successfully designed a feedback controller using remote signals with good inter-area oscillation observability