AC Impedance Modeling of Modular Multilevel Converters and Two-Level Voltage-Source Converters: Similarities and Differences

Heng Wu, Xiongfei Wang, Lukasz Kocewiak, Lennart Harnefors

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11 Citationer (Scopus)

Abstrakt

This paper presents a small-signal model for modular multilevel converters (MMCs) by using the harmonic state space (HSS) method. The ac output impedance of the MMC is then derived and compared with that of the commonly used two-level voltage-source converters (TL-VSCs). It turns out that the low frequency ac impedance of the MMC differs from that of the TL-VSC, due to the influences of internal dynamics, especially for the open-loop control and the voltage-mode control. In contrast, for the current-mode control, this difference can be minimized by the current regulator with a high-gain in the low frequency range. Moreover, despite the used control schemes, the high frequency ac impedance of the MMC is similar to that of the TL-VSC. The time-domain simulations are provided to validate the effectiveness of the theoretical analysis.
OriginalsprogEngelsk
TitelProceedings of the 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)
Antal sider8
ForlagIEEE Press
Publikationsdato10 sep. 2018
Sider1-8
Artikelnummer8459952
ISBN (Trykt)978-1-5386-5542-9
ISBN (Elektronisk)978-1-5386-5541-2
DOI
StatusUdgivet - 10 sep. 2018
Begivenhed19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018 - Padova, Italien
Varighed: 25 jun. 201828 jun. 2018

Konference

Konference19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018
LandItalien
ByPadova
Periode25/06/201828/06/2018

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