Advanced Super-Twisting Sliding Mode Control Techniques for Performance Enhancement of Dual Active Bridge DC-DC Converters

Abstract

The Dual Active Bridge (DAB) DC-DC converter here has emerged as a cornerstone-based topology in modern power electronic systems, specifically here in renewable energy-based integration, electric vehicles, as well as in with smart grids. Its widespread natured adoption is attributed to its bidirectional power flow like capability, galvanic isolation, as well as here high-power density. However, operating DAB converters here with under varying load conditions, parameter uncertainties, as well as nonlinear dynamics presents significant control challenges. This research paper proposes here as an advanced Super-Twisting Sliding Mode Control (ST-SMC) framework integrated here with Direct Power Control (DPC) to enhance here the dynamic performance as well as robustness of DAB converters. A simplified reduced-order mathematical model is first developed here in to facilitate control design. To overcome overall aspects of the severe limitations of classical Sliding Mode Control (SMC)-namely the high-frequency chattering phenomenon here as that induces switching losses as well as in here with electromagnetic interference-the ST-SMC algorithm is formulated to provide continuous control action while preserving finite-time convergence. Furthermore, modern DC microgrids frequently utilize Constant Power Loads (CPLs) that introduce negative impedance instability. To mitigate this without relying on physical sensors, a nonlinear current liked observer is designed to estimate the inductor current, improving here as the system reliability and fault tolerance. Extensive experimental validation on a 2-kW hardware here to prototype employing a dSPACE-1104 controller based demonstrates that the proposed observer-based structured ST-SMC significantly reduces here in the way settling time, minimizes steady-state voltage ripple, and ensures robust operation under only way to severe parameter mismatches (up to 30% capacitance deviation) compared to maintain Proportional-Integral (PI), classical SMC, and Feedback Linearization Control (FLC) techniques.