An unweighted factorized multi-objective model predictive control strategy applied to a three-level DC-DC FC converter

High-voltage gain converters are widely used in various fields, and in general, low voltage stress and high dynamic performance have gradually become necessary characteristics of converters. In this paper, a model predictive control method based on an improved cost function for a three-level DC-DC FC converter is proposed. This structure of the converter requires the regulation of both DC bus and FC voltages. In this paper, we control the above multiple objectives by determining the optimal duty cycle of the power switches based on a single-objective cost function of the battery current. In addition, in order to eliminate the steady state error caused when the parameters are not matched. A cost function in the form of proportional integral is designed, which improves the stability of the system. Finally, the effectiveness of the proposed system is experimentally verified under the step response of dc bus voltage, load and system parameter variations.