FCS-MPC aplicado em filtro híbrido multinível para compensação harmônica e de reativo

Abstract

This work proposes the application of finite control set model predictive control(FCSMPC) for dynamic reactive power and harmonics compensation. To achieve these objectives the FCS-MPC is applied to a hybrid active power filter consisting of a capacitor bank, an LCL filter and a multilevel converter. The reactive power control is accomplished through control of the capacitor bank voltage, in this way it is possible to deliver reactive power greater or smaller than the nominal power of the capacitor bank. The source current harmonics compensation is based on two principles: harmonic blocking, which prevents grid voltage harmonics from generating harmonic currents in the source; and filter tuning, which turn the hybrid filter branch into a short circuit for the load harmonic currents, avoiding them to penetrate the grid. A multivariable control is applied in order to reduce the problems with the LCL filter resonances. The control references for the fundamental frequency are obtained from the system model, and a proportional resonant control is applied to calculate the references for the harmonic frequencies. Simulations and experimental results are presented in order to verify the behaviour of the applied techniques.