The North Sea Offshore grid idea has been evaluated as one of a key structures, necessary to ensure the stability of supply in countries of European Union and reduce the energy imported from outside EU. The HVDC connection COBRAcable, which will connect Denmark with Netherlands is supposed to became a Multi terminal DC connection in the future. Since currently there are only few operating VSC MTDC connections in the world and none of them located in Europe, the studies regarding MTDC connections are necessary. Since there are few possible control strategies which may be implemented into the MTDC terminals, it is crucial to determine which one is the most reliable in terms of robustness and operability. This project focus is to find this strategy, based on several test and observation of system behaviour. The model and analyses were created and performed in DIgSILENT Power Factory.