Model predictive control of three-level four-leg flying capacitor converter operating as Shunt Active Power Filter

This paper proposes the new implementation of Finite Control States Set Model Predictive Control (FS-MPC) applied to 3-level 4-leg Flying Capacitor Converter (FCC) operating as a Shunt Active Power Filter (SAPF). The developed approach is based on three important issues that are described. The first is addressed to the phase to phase model of the 4-wire system to simplify the prediction equations. The second relates to calculation amount reduction gained through applied Flying Capacitors´ voltages control and suitable interpretation of FCC switching states in the converter´s model. The third regards to cost function extension and considered system restrictions: elimination of simultaneous commutations of all transistors in one leg and reduction of the switching events number. The control performance was analyzed in Matlab-Simulink model. Presented simulation studies validate the effectiveness of proposed solution.