Robust Nonlinear Control for Charge-Discharge Operations in Parallel DC Power Systems

This paper presents a robust nonlinear control strategy for charge-discharge operations in parallel DC power systems. For current tracking constraints under constant-current charging mode, an adaptive prescribed-performance sliding mode controller (PPSMC) is designed to prevent overcurrent damage to batteries. To address bus voltage fluctuations in discharge mode, a hyperbolic tangent sliding mode controller (HTSMC) is developed. Simulation results demonstrate that the proposed scheme significantly outperforms existing methods in dynamic response and stability, providing high-robustness core support for smart substations and PV-storage microgrids.