Este trabalho apresenta o projeto de um controlador robusto de corrente por realimentação de estados baseado em desigualdades matriciais lineares, conduzindo a um conjunto de ganhos fixos capaz de garantir a alocação dos polos de malha fechada em um círculo de raio mínimo, centrado na origem e contido no círculo de raio unitário (controlador robusto quasi-deadbeat). Para aplicações em conversores conectados à rede, o procedimento de projeto proposto produz resultados ilustrando que relaxações a partir do controlador robusto quasi-deadbeat garantem estabilidade e bom desempenho para uma faixa de incertezas e para variações nos parâmetros da rede e do filtro.
Title: A robust quasi-deadbeat controller and relaxations applied to grid-connected inverters
This work presents the design of a robust state feedback current controller based on linear matrix inequalities, leading to a set of fixed gains capable of ensuring the assignment of the closed-loop poles in a circle of minimum radius, centered at the origin and included in the unit circle (robust quasi-deadbeat controller). For applications to grid-connected converters, the proposed design procedure provides results illustrating that relaxations from a robust quasi- deadbeat controller ensure stability and good performance for a set of parametric uncertainties and variations on the grid and filter parameters.
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