Study on sliding-mode control in three-level converters

Sliding-mode control has such advantages as robustness, simple algorithm and good dynamic performance, so sliding-mode control was introduced into three-level (TL) converters in this paper. The design of sliding-mode control buck TL converter, including sliding-mode control surface design, equivalent control, stability and existence proof, was given as an example. Experiments of sliding-mode control buck TL converter and traditional PWM buck TL converter were carried out in order to analyze and compare. Analysis results verify that dynamic performance and robustness are improved greatly in the sliding-mode control buck TL converter compare with traditional PWM buck TL converter.