Unterminated Thevenin Black Box Modeling of a DC/3AC Converter for Aerospace Applications

This article describes a Thevenin black-box modeling method for a converter in the context of a power architecture used for aeronautical applications. It focuses on a non-intrusive procedure based on frequency-domain measurement of the elementary and common-mode currents across the converter, as well as measurement of the impedances of the power architecture equipment. It demonstrates the use of a minimization algorithm to reconstruct the phases of elementary currents not directly accessible by measurement, and the validity of this method. Finally, the model is validated by comparing simulation and measurement, in particular the unterminated aspect of the model