Robustness Analysis of Primary Frequency H-inf Control in Stand-alone Microgrids with Storage Units
Résumé
This paper presents a robust H-inf control design approach for primary frequency regulation in isolated microgrids (MGs). MGs consisting of diesel generators, photovoltaic (PV) panels and storage units are here considered. Starting from given certain desired design specifications, a multi-variable H-inf controller is designed via the linear matrix inequalities (LMI) method. In the second step, uncertainty in the storage device state of charge (SoC) is considered and a robustness analysis using mu-analysis is carried out in order to determine its maximum variation range for which the control performances imposed are respected. MATLAB® / Simulink® time-domain simulations validate the controller's robustness and performance in the presence of various load disturbances and SoC uncertainty.