Terminal Sliding Mode Control of DC-DC Boost Converter for Stable DC-Link Voltage Regulation

Abstract

The regulation of DC-link voltage is a critical requirement in modern power electronic systems, particularly in renewable energy conversion, electric vehicle powertrains, microgrids, and high-performance motor drive applications. Conventional proportional–integral controllers often exhibit degraded performance under parameter uncertainties, load disturbances, and nonlinear operating conditions inherent in DC–DC boost converters. To overcome these limitations, this study investigates the application of Terminal Sliding Mode Control (TSMC) for robust and rapid DC-link voltage regulation in a DC–DC boost converter. The proposed control strategy employs a nonlinear terminal sliding surface that guarantees finite-time convergence of voltage tracking errors while maintaining strong robustness against system uncertainties and external perturbations. The controller design is developed based on the nonlinear dynamic model of the boost converter and incorporates stability analysis using Lyapunov theory. The effectiveness of the proposed approach is evaluated in terms of transient response, steady-state accuracy, disturbance rejection capability, and voltage regulation performance. The results demonstrate that the TSMC approach achieves superior dynamic behavior, reduced settling time, minimal overshoot, and enhanced robustness compared with conventional control techniques, making it a suitable solution for stable DC-link voltage regulation in advanced power electronic applications.