Optimal Design of Photovoltaic MPPT Disturbance Step Length in a Rapidly Changing Environment

Abstract The traditional maximum power point tracking (MPPT) algorithm can not track the maximum power point (MPP) quickly and accurately in the environment of rapidly changing illumination amplitude. In this paper, based on the basic circuit model of solar cell, the small signal model between the disturbance step size of MPPT algorithm near the maximum power point and the intensity of light irradiance, ambient temperature, working voltage and working current is used, and then the MPPT duty cycle disturbance is modelled and analysed. The simulation results show that the model proposed in this paper clarifies the mechanism of the disturbance step size of MPPT algorithm in the environment of rapidly changing illumination amplitude. It also provides a theoretical basis for the design of subsequent disturbance step size.