Analysis of Interoperability between DC-Voltage-Droop-Controlled MMCs with Grid-Forming Functionality in a MTDC Grid
Abstract
In this article, the interoperability between droop-controlled Modular Multilevel Converters (MMC) with Grid-Forming (GFM) functionality in a 3-terminal DC grid is investigated. Two possible implementations of GFM control, namely Virtual Synchronous Machine (VSM-GFM) and matching-GFM, are combined with two implementations of DC voltage droop. A small-signal analysis on a three-terminal asymmetrical monopolar DC grid is conducted to identify the limitations of the control parameters related to system stability and dynamic performance. Time-domain simulations are conducted to analyze the effect of control parameters on system response. The results demonstrate the interoperability between the two control options, subject to some control parameter limitations.
Mohamed Elsodany, Kosei Shinoda, Jing Dai, Seddik Bacha
Presented at IEEE 2025 Kiel Powertech
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