Photovoltaic MPPT Based on Recursive Non-Singular Fast Terminal Sliding Mode

In order to improve the robustness and power generation efficiency of photovoltaic(PV) system, a perturbation and observation(P&O) cascade Recursive Non-singular Fast Terminal Sliding Mode Control(RNFTSMC) scheme is proposed. Initially, the P&O method is utilized to obtain the reference voltage at the maximum power point(MPP) of the PV system. Subsequently, a voltage controller is implemented to track the reference voltage and achieve maximum power point tracking (MPPT) for the PV system. The controller adopts a recursive structure incorporating the non-singular fast terminal sliding mode surface and integral sliding mode function. This approach enforces the system to start directly from the sliding mode surface, reducing the convergence time of tracking errors. The stability of the controller is proven using Lyapunov theory. Matlab/Simulink simulation results demonstrate that under varying external environmental conditions, the proposed method exhibits higher tracking accuracy and faster response speed, effectively enhancing the robustness of the system and ensuring stable operation of the PV system.