Modeling and simulation of three-level DC/DC converters of high voltage wide range PI control

Abstract

The three-level DC/DC converter is widely used in various applications, including electric vehicle charging stations, portable power supplies, and photovoltaic power generation. The mathematical models of input voltage, output voltage, and duty cycle of IGBT switch tube are established by analyzing the different operating modes of IGBT switch tube under PWM control. To validate the accuracy of the mathematical models, a simulation model can be built in MATLAB virtual environment, and a proportional-integral (PI) controller can be utilized to implement a hybrid closed-loop control strategy, where the current serves as the inner loop and the voltage as the outer loop. Such a control scheme will help to verify the feasibility of the mathematical models.