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

Samy Akkari (1) , Jing Dai (1) , Marc Petit (1) , Pierre Rault (2) , Xavier Guillaud (2)

1 GeePs - Laboratoire Génie électrique et électronique de Paris
2 L2EP - Laboratoire d’Électrotechnique et d’Électronique de Puissance - ULR 2697

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.

Keywords: modal analysis; MTDC; state-space model; HVDC

Domains: Engineering Sciences [physics]

Samy Akkari, Jing Dai, Marc Petit, Pierre Rault, Xavier Guillaud. Small-Signal Modelling for In-Depth Modal Analysis of an MTDC System. 2015 IEEE Electrical Power and Energy Conference (EPEC), Oct 2015, London, Canada. ⟨10.1109/EPEC.2015.7379955⟩. ⟨hal-01244019⟩