Abstract
VSC-HVDC system is adopted more and more for its flexible control capability and multi-terminal topology. Offshore wind farms are becoming a preferred solution for wind power in many countries. The integration of offshore wind farms to grid is critical for efficient power delivery, since the transmission via long distance underwater could be a problem such as high percent power loss. The Multi-Terminal VSC-HVDC system is a suitable choice to integrate the offshore wind power with grid due to its advantages, such as flexible control capability and low power loss via DC cables. The contribution of this work is twofold: (i) detailed models of DFIG wind generators and MultiTerminal VSC-HVDC system are built and tested, and (ii) both normal operations and grid side ground fault are studied, and an approach to mitigate the over-voltage during fault is proposed and tested. The models and simulations are developed and tested via Matlab/SimPowerSystem.
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