Aplicação de FCS-MPC em um filtro ativo híbrido para compensação harmônica e reativa com cálculo das referências baseado no modelo do sistema

Abstract

The application of Finite Control Set Model Predictive Control (FCS-MPC) to control power electronics devices has been widely studied in the last decades, mainly for being a non-linear control technique with fast dynamic response, which are two characteristics suited for the control of this class of devices. This work presents the application of FCSMPC for reactive power and harmonics compensation with a hybrid active power filter. This control technique was already proven effective to control this equipment. In previous work the harmonic currents compensation is realized by a proportional resonant controller, with resonant components tuned to each of the desired compensation frequencies. Although effective, this technique requires great processing time and the need to tune several control gains. Another problem found in the FCS-MPC literature is its strong dependency on model parameters values. Parameters mismatch can cause errors in control reference calculation, increase in harmonic distortion and steady state errors. Aiming to reduce the processing time and avoid the tuning of several resonant gains this work proposes a method to calculate the control references based only on the system model. A comparison between parameters estimation techniques found in literature is presented and the techniques are evaluated based on its dynamic response, steady state behavior and computational cost. Simulation and practical results demonstrate the proposed method effectiveness to provide reactive power and harmonics compensation with a fast dynamic response and reduced computational burden.