Fixed-Time Differential Flatness Sliding Mode Control for Bidirectional DC-DC Converters in DC Microgrids

This paper presents a novel fixed-time differential flatness sliding mode control method to enhance bus voltage stability in DC microgrids operating under dynamic conditions. Fixed-time control ensures rapid convergence within a predefined upper bound, providing a predictable stabilization time. Differential flatness control addresses nonlinear system dynamics, enabling precise trajectory tracking for accurate voltage regulation. Sliding mode control further enhances robustness by effectively mitigating system uncertainties and external disturbances. This comprehensive approach improves system stability while minimizing voltage fluctuations in bidirectional DC-DC converters. Simulation results validate the proposed method’s effectiveness in improving strength, robustness, and precision across diverse operating conditions.