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Small-Signal Modelling for In-Depth Modal Analysis of an MTDC System

Archive ouverte : Communication dans un congrès

Akkari, Samy | Dai, Jing | Petit, Marc | Rault, Pierre | Guillaud, Xavier

Edité par HAL CCSD

International audience. In this paper, the state-space model of a VSC-MTDC system is derived from individual components and a modified PI section model for cables is proposed which considers both core and screen conductors as well as their coupling. A modal analysis performed on the complete system reveals the influence of each component on the system modes and permits the identification of a dominant DC voltage mode. This mode has proved to be largely affected by the energy storage level of the DC grid, and to be predominantly influenced by the voltage-droop parameters of the converters, meaning that the DC voltage dynamic of the MTDC system can be imposed thanks to a judicious choice of the voltage-droop parameters.

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