Determinación de los parámetros de la caracterización DLC del supercondensador del laboratorio de Micro-Red

Abstract

Supercapacitors are key devices in modern energy storage applications, particularly in backup systems, electric vehicles, and microgrids, due to their high power density and long service life. This work presents the identification of parameters for two equivalent circuit models applied to a supercapacitor bank with over a decade of usage. The first model, based on the structure proposed by the manufacturer, fails to accurately reproduce the terminal voltage evolution, even after numerical parameter adjustment, revealing its limitation in representing the actual behavior of the aged bank. The second model, based on Zubieta’s proposal, incorporates the nonlinear dependence of capacitance on voltage and was obtained based on the manufacturer’s model output. However, it also required numerical tuning, which yielded significantly different parameters consistent with an advanced aging state of the device. The results suggest a loss of conduction capability, a reduction in total capacitance, an increase in leakage resistance, and a slower dynamic response, considering that the bank is approaching the end of its useful life.