Analytical methodology to develop frequency-dependent equivalents in networks with multiple converters

This paper discusses the analysis of dynamic interactions above the fundamental frequency in networks with high penetration of converters. For this purpose, interaction studies require a good representation of network resonances and converter dynamics. However, current methodologies present some limitations in this respect. On one hand, the harmonic impedance obtained from the frequency scan in software does not consider the influence of converter control dynamics. On the other hand, stability studies considering this influence typically do it at the cost of simplifying the network representation. The increasing penetration of converters in the network raises concerns due to their limitation in accurately capturing the instability. This paper demonstrates the impact of control interactions in a meshed AC network with several converters and how this interaction influences the network resonances. To overcome the limitations of existing methods, the paper presents a systematic method to capture the relevant dynamic phenomena.status: publishe