Finite control set model predictive control of a grid connected two-level converter

In this paper a method to control the output current of a three-phase grid connected two-level converter is presented. The current control approach is a finite control set model predictive control with sphere decoding. Sphere decoding algorithm gives a computationally efficient solution of the problem for long horizons. The goal of the control algorithm is to minimize the grid current tracking error and switching frequency. These goals are met with the choice of the appropriate cost function. Simulations are carried out in order to investigate the proposed current control approach. The influence of control parameters on the control objectives is investigated through simulations.