The study for MPPT of photovoltaic system based on terminal sliding mode control method

Abstract

Aiming at the problem of the Maximum Power Point Tracking (MPPT) of PV system, based on the requirements of improving the tracking speed and reduce the steady-state oscillation, a terminal sliding mode control method is proposed to complete MPPT control in this paper. Mathematical model of the PV module is realized by four parameters with standard condition. Unlike traditional methods, it is proposed that the tracking current and power reference at the maximum power point at arbitrary conditions can be obtained directly from the established model. It is simple and can avoid the tracking error. In this paper, we tracked the outputs of the PV module under different conditions and compared the proposed method with the Incremental Conductance (INC) algorithm, the results show that the proposed control method can enhance the track speed and accuracy, decrease the steady-state oscillation and improve the efficiency of PV system.