Abstract
The flexible extended harmonic domain (FEHD) is a HD-based technique which has been applied to the modeling of modern power systems for waveform distortion studies. The FEHD provides the dynamics of harmonics and/or interharmonics, not necessarily arranged in sequential order. However, those discrete frequencies are fixed for the complete simulation process. This hinders performing a more complete analysis involving a wider frequency spectrum in the system’s dynamics. If a finer frequency discretization is chosen in FEHD, dimensions explosion occurs.To overcome the abovementioned issues of FEHD, this paper presents an improved technique, named here as dynamic FEHD (DFEHD). The DFEHD fundamentally relies on the analytic solution of a linear system applied to FEHD models. Such combination permits to model the system under study as a closed-form expression which involves a wider and finer frequency band. Two case studies are presented to validate the proposed methodology.
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