Frequency response based behavioral modeling verification for three phase AC-DC converter

Abstract

In modern distributed energy systems (DES), there is a shift in focus from conventional centralized approach to more advanced distributed architecture. Modeling and analysis of these complex systems is more challenging, as multiple energy sources are connected with different loads through power electronics converters. Due to vastly different dynamic characteristics of these converters, it is necessary to model their behavior before integration into DES, to avoid various issues, e.g. instability. This paper presents behavioral modeling methodology for a three phase AC-DC converter system based upon the measurement of frequency responses. The frequency responses are measured using a black-box approach, i.e. independent of system's internal design and parameters. For verification, the dynamic analysis is performed for the actual switching model and compared with the developed behavioral model. The matching of results from the switching model and frequency response measurements based behavioral model serves to verify the accuracy of the methodology used for frequency response measurements and behavioral modeling.