Abstract
The so-called modular modeling of interconnected AC/MTDC (Multi-Terminal DC) systems aids their synthesis and analysis by decomposing it into structural modules (e.g. voltage-source converter, synchronous generator, AC line, DC line) and by exploring the patterns of interconnection that yield the overall performance of a system. In this paper, we introduce our idea on the modular modeling of large-signal dynamics for an interconnected AC/MTDC system. Effectiveness of the idea is shown with numerical simulations for a relatively simple configuration of three-terminal DC grid.