Procedimentos de projeto de controladores robustos baseados em otimização por enxame de partículas e desigualdades matriciais lineares para conversores conectados à rede

Abstract

This work presents design procedures for robust optimized state feedback current controllers for grid-connected converters with LCL filter operating with uncertain grid inductances. The proposed procedures are based on the use of a particle swarm optimization algorithm, to search for optimal controller parameters, and stability analysis conditions based on linear matrix inequalities, to certify the robust stability of the closedloop system under parametric uncertainties. Real-time simulations based on Controller Hardware-in-the-loop are used to test the controllers for different grid situations, showing that the proposed procedures are capable of synthesizing grid-injected currents complying with the requirements of the IEEE 1547 Standard. Experimental results are presented to confirm the practical viability of controllers in a prototype of a grid-connected converter. Finally, comparative analyzes are presented to position the proposed procedures in relation to state feedback control techniques present in the literature.