Open AccessAnalytical derivation of the DC‐side input admittance of the direct‐voltage controlled modular multilevel converter
Author(s) -
Stamatiou Georgios,
Beza Mebtu,
Bongiorno Massimo,
Harnefors Lennart
Publication year - 2017
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2017.0278
Subject(s) - admittance , converters , control theory (sociology) , modular design , admittance parameters , voltage , forward converter , topology (electrical circuits) , computer science , physics , engineering , boost converter , electrical impedance , electrical engineering , control (management) , artificial intelligence , operating system
The input admittance of a converter, connected to other dynamic subsystems, is a useful tool to investigate whether poorly damped oscillations or even unstable conditions might occur at certain frequencies. This is of interest in applications employing the modular multilevel converter (MMC), where the internal dynamics of the converter and the increased number of control loops greatly affect the MMC's dynamic behaviour, compared to other types of converters. In this study, the dc‐side input admittance of the direct‐voltage controlled MMC is derived analytically and verified via small‐signal perturbation in a detailed non‐linear time‐domain simulation model. The MMC's input admittance is parametrically studied and compared to the dc‐side input admittance of an equivalent two‐level converter.