A Model-Free Approach for Predictive Direct Power Control of Grid-Connected Converters

Abstract

This paper presents a model-free finite control set predictive direct power control for grid-connected converters. As the proposed method does not use the model parameters, their uncertainties do not cause prediction error and inappropriate voltage vector selection, unlike the conventional predictive direct power control method. A new form of cost function is adopted in the method that directly uses the time-derivatives (slopes) of the active and the reactive powers. The slopes are predicted free of model parameters with low computational burden and without additional sensors. The method is evaluated through simulation and its performance is compared with the one of the conventional model predictive direct power control method. The results show the effectiveness of the proposed method and its superiority over the conventional method.