Abstract
Due to the significant coupling impacts of the internal multiharmonic dynamics on the ac terminal in a modular multilevel converter (MMC), its terminal characteristics is quite different from a two-level voltage-source converters (VSCs). Thus the complex modeling methods, e.g. the harmonic state-space modeling approach, are required to analyze the stability of MMC-based system. In this paper, the internal dynamics of MMCs are decoupled in the differential-mode (DM) circuit using insertion indices compensating method by feedforwarding the capacitor voltage. Therefore, the ac-side characteristics is the same as that of the two-level VSCs, and the stability and controller parameters can be design-oriented by the simple averaged small-signal model.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
