On Active/Reactive Power Modulation of DFIG-based Wind Generation for Inter-area Oscillation Damping

Accepted on 10/11/2010 by IEEE trans. Energy Conversion

Abstract—In this paper, the interactions of the torsional dynamics of the wind turbines and power modulation for oscillations in DFIG-based wind generators are investigated. One major concern of active power modulation is its interaction with wind turbine’s torsional dynamics. A study case with wind turbine torsional dynamics modeled is derived from [1]. Both active
power modulation and reactive power modulation controls are developed in this paper. The paper successfully demonstrates the presence of interaction between active power modulation and torsional dynamics and the absence of such interaction in the case of reactive power modulation. Linear system analysis and root loci approach are employed to demonstrate such interaction. Simulation results in MATLAB/Simulink further verifies the analysis. The major contribution of this paper is: i) the demonstration of the potential disadvantage of wind generation’s active power modulation, and ii) the identification of reactive power modulation in wind generation as an alternative for interarea oscillation damping.

Index Terms—Doubly fed induction generator (DFIG), Interarea
Oscillation Damping, Active Power Modulation, Reactive
Power Modulation