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摘要
A novel input-output linearization algorithm-based inter-area oscillation damping control strategy for the doubly fed induction generator (DFIG) is proposed in this paper. The dynamic model of the study system, a classical two-area power system for inter-area oscillation study integrated with a DFIG-based wind farm, is modeled first. Then, the suitable input and output variables are chosen according to the control objective, which are the variables need to be linearized. The feedback control law, which can linearize the selected system input to system output, is obtained via the Lie derivative of the output function and state function according to the input-output linearization algorithm. Therefore, the control parameters can be designed to utilize the linear system control algorithm to improve the system dynamic response. The proposed control strategy can deal with the nonlinearity existing in the damping control loop, and thus the performance of the damping control can be improved. The simulation carried on the MATLAB/Simulink platform was employed to investigate the performance of the proposed damping control strategy for DFIG. Simulation results are compared with those of a system with no additional damping controller and with a conditional damping controller. It shows that proposed method can improve the system damping obviously. Compared to the conventional power system stabilizer (PSS) control, the proposed damping controller can damp the swing in power more quickly.
