Dynamic model and dynamic characteristics of solar cell

Abstract

To provide academic support for studying the stability of photovoltaic generation systems, the dynamic model and dynamic characteristics (especially the small-signal output impedance) of solar cell are explored further in this paper. Based on the physical model of silicon solar cell, the analytical expressions of steady-state characteristics and the dynamic characteristics are deduced at first; then the dynamics circuit model of solar cell considering the cabling impedance is obtained; after that, the exact expressions of dynamic resistance, equivalent capacitor and small-signal output impedance are derived. Finally, the correctness of theory analysis are validated by simulations and dynamic experiments performed on the platform built with light-emitting diodes (LEDs) and electric double layer capacitor (EDLC).