• DC wind turbine
• electric generator control
• wind farm

Countries all around the world are setting new targets, on renewable energy, to be achieved in the coming years. Europe is proceeding in line with its 2020 targets, and current discussion within EU indicate that the overall renewable targets could be raised to 35% by 2030. Due to this there is still a great need around the world for new power generation, which is clean, aordable, reliable and quick to install. Wind power is leading the transition away from fossil fuels and continues to blow away the competition on price, performance and reliability. The industry is maturing really fast, especially the oshore sector. Oshore prices for projects to be completed in the next ve years or so are half of what they were for the last ve years, installations in 2017 almost doubled the one in 2016 marking a record year for the oshore wind industry.
This thesis, developed in collaboration with the ABB Corporate Research Center in Ladenburg (Germany), deals with the analysis of an innovative oshore wind farm conguration based on a DC grid. First the state of art and the dierent oshore wind farm topologies were introduced, then the system analysed in the thesis was presented and discussed in details through software modelling and simulations.
Chapter 2 shows how the main components of the system were modelled using the PLECS software. A detailed description of all components was provided, with equations and models.
The control system was designed and modelled using the reference feedforward technique because it has several advantages compare to the classical feedback conguration. It was implemented in Matlab/Simulink how shown in Chapter 3.
The cable length was designed to avoid resonances in the interconnection cable between the wind turbine and the oshore substation. Investigating the inuence of the control parameters a new way to avoid resonances was found, which is changing the gains of the PI controller.
In the end, simulations results are shown and discussed in details to demon- strate the eectiveness of the analysed system and of the adopted designing method.