Using measurement of AC parameters for CIGS PV modules degradation studying

There are many diagnostic methods for PV modules parameters determination used. Most of them are based on measurement of static parameters, but therefore exist also measurement methods for AC parameters such a capacitance or impedance determination. In the paper is described Time Domain Reflectometry method which can be used for differentiation of PV modules with same static plate values. Different AC parameters can cause dissimilar behavior in alternating fields leading to premature degradation.