Publication Type
Conference Paper
Book Title
Proceedings of the 2019 IEEE Energy Conversion Congress and Exposition
Publication Date
Page Numbers
646 to 653
Publisher Location
New York, United States of America
Conference Name
Energy Conversion Congress and Exposition
Conference Location
Baltimore, Maryland, United States of America
Conference Sponsor
IEEE
Conference Date
-
Abstract
The modular multilevel converter (MMC) is regarded as a competitive choice for future dc grids at high and medium voltage levels. To study the dc grid stability, a few MMC dc impedance models have been proposed, but their accuracy is limited by the assumption of ideal submodule voltage or neglecting the circulating current control. In this paper, a more accurate MMC dc impedance model is developed considering both the submodule capacitor voltage and circulating current dynamics. Simulation and experiment results indicate that the developed model matches with the actual MMC better than state-of-art models and can predict the dc system stability correctly.
