A Comprehensive Analysis and Modeling of The Bidirectional Three-Level DC-DC Converter with Auxiliary Control Scheme for Balancing Voltages of Its Capacitors

In this paper, the analysis, modeling, comprehensive controller design for the three-level dc/dc converter (TLC) is discussed. Bidirectional three-level converters have a wide range of applications, such as those used in electric vehicles (EVs). High efficiency, lower inductor size than similar and competing converters distinguish TLC for researchers. Symmetry analysis in TLC, linearization model method and linear model approximation from non-linear model is evaluated by using Matlab/Simulink program. Zero and pole behavior, open and closed loops of TLC for load and duty cycle changes and duty cycle constraints in non-ideal model is stated in this paper. Finally, a control scheme for voltage balance between series capacitors are presented.