Controle robusto LMI/H aplicado a um gerador eólico dfig

Abstract

This work presents the design of a robust control strategy based on linear matrix inequalities (LMI) applied to the control of a wind generator DFIG (Douby Fed Induction Generator) and the control of a power converter used in DFIG rotor power supply. In northeast of Brazil and especially in Ceará region, they are being installed parks with modern wind turbines using the DFIG to generate electricity, which is one of the motivations for this study. This work also presents the optimization concepts via norm, and makes a comparison with results obtained from the control with industrial controllers PIs. Firstly, the wind turbine/generator system is modelled for obtaining a linear system model, from the basic model, we studied the classical strategy of control, PI control, and the multivariable controller LMI and norm, finally, it was applied the robust control aiming a better performance in terms of steady state and system robustness. The control strategies used ensured robustness in relation to parametric variations in the model and secured approximately a zero static error. The model and theories presented in this paper have been validated through simulations using MATLAB/Simulink software, demonstrating good performance and robustness of the proposed controllers.