Assessment of two DC voltage droop options for small-signal stability in MMC-based multi-terminal DC grids

Abstract

The paper studies the stability issue in a multi-terminal HVDC grid where multiple vendors implement different control strategies for DC voltage regulation. Small-signal analysis reveals the effects of the droop gain values of two control options, with one showing better robustness than the other. The effects of the response time of the outer control loops as well as those of the DC reactors are also investigated. The results of the small-signal analysis are supported by EMT simulations.

Mohamed Elsodany, Kosei Shinoda , Jing Dai , Alberto Bertinato , Seddik Bacha.

Presented at PEMD2024.
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