Light Intensity Modulation and Two-Port Network Analysis of Dynamic Response of Photovoltaic Module

This paper introduces a new method for measuring the dynamic response of a photovoltaic (PV) module using light intensity modulation. The aim of this work is to capture the frequency response of the panel using the proposed modulation technique and transmission parameter derivation. By controlling the PWM signal used in a switch-mode LED driver, a sinusoidally modulated light intensity of variable frequency is applied to a PV module. A collimating lens and a reflector are used to evenly distribute light across the panel, ensuring each cell is perturbed equally. A two-port network approach is then utilized to represent the dynamic response. Through the two-port network analysis, the ratio of LED current to PV module voltage is used to display the response from the light intensity modulator to the PV module. To validate the proposed method, a 36-cell, 10W PV panel is used.