Large-Scale 3D Electromagnetic Field Analysis for Estimation of Stator End Region Loss in Turbine Generators

抄録

Improving the energy efficiency and increasing the power density of indirectly hydrogen-cooled turbine generators used in high efficiency combined-cycle power plants is important due to global warming and increasing power demands. When the output current is increased for achieving high power density, the stray load loss at the stator end region increases due to leakage flux from the armature and field coils. Therefore, it is necessary to evaluate the temperature of the stator end region under the condition of leading power factor load. In this paper, we analyzed the loss density distributions at the end region structures using large-scale 3D electromagnetic field analysis to establish the temperature reliability of an 870 MVA indirectly hydrogen cooled machine, which is the largest class capacity in the world. Thermal analysis was then performed using the loss density distribution obtained from the 3D analysis. The analysis results show good agreement with the measured values.