Controle digital de um Filtro Ativo de Potência Shunt em espaço de estados com controladores ressonantes sintonizados utilizando Regulador Linear Quadrático Discreto (DLQR)

Abstract

The present dissertation aims to model and design the control system of a tree-phase FAPS in state-space. First, a continuous time model in ce/3 frame of the FAPS is obtained. Subsequently, the resulting plant is discretized, enabling the design of the controller digitally. Several resonant controllers are used in order to track the reference current and, consequently, reduce the current distortion drained from the grid. A systematic methodology is developed to include resonant modes in state space, allowing a unified controller's gains design. The dLQR method is used to calculate the feedback gains. Instantaneous power theory p — q is applied to generate the reference current. In order to keep a minimum DC-side voltage for the correct operation of the filter, an external voltage loop based on PI compensator is designed. Finally, some specific cases are simulated to evaluate the control effectiveness, as well as, the FAPS operation. The analysis of the results have shown that the used control strategy was capable of reducing the grid current THD to levels recommended by IEEE-519.