Super-twisting sliding mode control of interleaved DC-DC converter based on high-order ESO

Considering the influence of periodic source voltage, an improved approach conbining high-order extended state observer (H-ESO) and super twisting sliding mode control (STSMC) is proposed for interleaved boost converter. The parametric variations and periodic source voltage are considered as lumped disturbance, which are estimated by H- ESO. The estimated state is applied to update the equivalent control part of STSMC, and a H-ESO based STSMC method is proposed to improve the accuracy of DC voltage regulation. The proposed approach is characterized by rapid dynamic response and stronger robustness. Constant DC voltage is guaranteed even with periodic source voltage variation. Finally, to demonstrate the effectiveness and robustness of improved approach, numerous comparative results are given under various loads and varying input conditions.

I. Introduction

With the gradual worsening of global environment, new energies such as wind, solar and hydrogen sources are getting more and more attention from several countries. Hydrogen fuel cell (HFC) is a device to convert energy in hydrogen into electricity, whose hydrogen source comes from industrial byproducts and final product is water[1], [2]. Hydrogen-fueled vehicle is a typical application. HFC features a low-voltage high-current property[3]. Hence, a boost type DC converter is necessary to generate accurate output voltage in hydrogen- fueled vehicle.