Modeling and Analysis of a Novel Grid Connection Topology for Offshore Wind Farms using MMC-HVDC Transmission

To meet the goals of the Paris Agreement, the Netherlands is integrating large amounts of offshore wind energy into the power system and has ambitious plans for the coming years. A grid topology with transmission capacity above 1 GW connecting offshore wind farms (OWFs) at distances close to 100 km in a standardized, modular, and cost-efficient manner is the focus of this paper. An electromagnetic transient (EMT) model was built in PSCAD in which OWFs are connected with 66-kV cables to a centralized offshore platform and a transmission link with a capacity of 1050 MW. The 66-kV cables will be coupled to three converter transformers connected to each other on the valve side and not on the 66-kV side. The link to the onshore transmission network uses VSC-HVDC technology with MMC topology. A dynamic performance analysis was done to obtain a complete overview and understanding of the overall behavior.