20 MVA Wind Turbine Power Conversion System with PM Vernier Generators

Various environmental regulations to overcome global warming have brought about many changes in the form of energy production. Power generation methods using eco-friendly energy are gradually increasing from existing fossil fuel-based power generation methods. Among various eco-friendly energies, wind turbines are attracting attention due to their large size and excellent performance. Therefore, much research is being conducted to build wind turbines of tens of MVA. This paper proceeds with the basic design of a 20 MVA wind turbine to be used in Korea. Unlike existing wind power generators, it uses a vernier generator and omits the gearbox, thereby reducing the causes of failure and providing the advantages of high torque density and reliability. At this time, an input filter was installed to offset the shortcoming of the vernier generator's low power factor. By applying an input filter, the power factor is increased and the stress on the power converter is reduced to produce a stable 20 MVA output. This method was verified using PLEC simulation and RT-box.