Optimized Model Predictive Control Space Vector Modulation for Three Level Flying Capacitor Converters

This paper proposes a space vector modulation strategy for three-level flying capacitor converters using mathematical rounding of floor and ceiling. As a result, allows the composition of switching vectors on line. For the choice vectors of the sequence is used a cost function that chooses the vectors with lower number of commutations. Another proposal included in the algorithm was to obtain a sequence where the average current passing in each flying capacitor is very close to zero. In this way, causing the voltage in the capacitors does not change significantly and decreasing the ripple. However, intrinsic losses to the converter components will cause the voltage in the capacitors to take an error beyond the acceptable. To correct this error a mathematical method based on a finite set model predictive control (MPC) was used. Furthermore, simulation results are presented to demonstrate the good performance of the proposed space vector modulation algorithm.