Improved Sliding Mode Control Strategy Based on Photovoltaic-Energy Storage Virtual Synchronous Generator System

In this paper, the new energy microgrid system of photovoltaic (PV)-energy storage (ES) controlled by virtual synchronous generator (VSG) is taken as the research object. Aiming at the problems of poor control accuracy, poor disturbance immunity in the traditional PI control as well as the common jitter problem of sliding mode controller, a kind of adaptive sliding-mode control (ASMC) method is proposed to effectively reduce the jitter phenomenon under the premise of guaranteeing the stability of the system by introducing the adaptive control. Meanwhile, considering the shortcomings of slow tracking speed and poor robustness under the traditional MPPT control in PV systems, an MPPT strategy based on super-twisting sliding mode control (STSMC) is proposed, which effectively improves the tracking speed and control accuracy. Finally, the simulation results verify the effectiveness and superiority of the proposed control strategy.