Interfacing Multi-Megawatt Large Scale Offshore Wind Turbine with Modular Multilevel Converter

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...

Improved cost of energy comparison of permanent magnet generators for large offshore wind turbines

This paper investigates geared and direct-drive permanent magnet generators for a typical offshore wind turbine, providing a detailed comparison of various wind turbine drivetrain configurations in order to minimise the Cost of Energy. The permanent magnet generator topologies considered include a direct-drive machine and single stage, two-stage...

Investigation on the Possible Use of Magnetic Bearings in Large Direct Drive Wind Turbines

A direct drive generator used in wind turbine has high energy yield compared to other drivetrain topologies and low maintenance is expected as the technology matures. On the other hand direct drive generator weight and size increases rapidly when scaled up to larger units. This paper will investigate the possibility of weight reduction of large...