Optimal robust control of a photovoltaic storage DC micro-grid based on extended finite-time observer

Aiming at the problems of poor efficiency ability of energy-storage devices in the hybrid energy storage systems of photovoltaic storage and DC microgrids, this paper proposes an energy storage control strategy for hybrid photovoltaic microgrid applying the technology of feedforward robust sliding mode control. First, an optimal robust sliding mode controller with extended finite-time dilated state observer (FTORC) is designed to deal with the influence of photovoltaic output fluctuations, which effectively improves the dynamic response characteristics of the hybrid energy storage system. Then, a finite-time dilated state observer is designed to observe the total disturbance, improving the fast and anti-disturbance performance of the system. Finally, simulation results show that the proposed control has faster response speed and better immunity to disturbances than the traditional control strategy.