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This paper presents a detailed case study of small-signal stability analysis for the Cigré DC-grid test system. The presented investigations are intended for identifying critical modes of interaction between different parts of the electrical system and the controllers in multi-terminal HVDC (MTDC) schemes. Oscillatory and critical modes of the system are investigated by modal analysis, including participation...
Large-scale Multi-Terminal (MT) HVDC grids will require decentralized control schemes where the converters can autonomously react to load changes or disturbances in the dc grid without the need for fast actions of a centralized controller. The majority of such proposed schemes are based on assigning a static Piece-Wise Linear (PWL) characteristic to each converter terminal, which defines a functional...
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