Interfacing Multi-Megawatt Offshore Wind Turbines with Modular Multilvel Converters.
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- Institutt for elkraftteknikk 
The aim of the master thesis was to investigate the effect of Modular Multilevel Converter (MMC) on wind energy electrical system. In different literature sources MMC is used at the grid side of the turbine. This thesis has a focus on the implementation of the MMC at the generator side of the wind turbine and comparing this new topology with already existing ones . Not only the advantages, but also the complications that arise when trying to design control strategy for this topology, are described in this thesis. \\ The reader is introduced with the general structure and operation of MMC. The paper also gives a brief overview of the wind turbine structure and different electrical systems that can be possibly used for wind energy production. \\ The simulation of the wind energy electrical system is carried out using MatLab Simulink. The simulation model contains permanent magnet synchronous generator (PMSG) and two MMC's, one at generator side and one at the grid side. A big part of the master thesis is a description of the control of the generator and the converter. \\ Conclusions compare the obtained results during simulations with the already existing topologies, that have been studied by student during 2 year master program.