With the growing number of wind turbines, the transmission of generated energy is becoming more and more an issue. A special challenge here is the connection of offshore wind farms to the existing grid. An efficient and low-loss option for such a connection over a relatively long distance is high-voltage direct current (HVDC) transmission. In the course of this diploma thesis, two models of voltage sourced inverters for use in HVDC headends were modeled using MATLAB-SIMULINK. One model represents the wind farm-side head station with the formation of a three-phase island network. The second model represents the shore-side head station, which is coupled to the interconnected grid. Both models were modeled as regulated ideal voltage sources with internal resistance. The aim was to keep the models as simple as possible and thus to get only a few influencing parameters in the form of control parameters. The models were examined for their behavior in different network situations and in different error cases. Finally, the effects on grid protection functions when feeding the modeled inverters were investigated.