Identification of field model's parameters in the turbine generator end zone using measured data

The present paper deals with an identification problem in the end zone of turbine generator. Parameters of the mathematical model of the coupled electromagnetic and temperature fields have been determined, using measured temperature data on the surface of the flange and fingers in the end zone. Different modes (rated, at the leading power factor and at the lagging power factor) are considered. Coupled field problem - electromagnetic and temperature field distribution in the end zone of a 200 MW turbogenerator is studied using FEM for forward problem. The secondary model of the temperature values at points with measuring control has been obtained using combination of response surface methodology and design of experiments. The identification problem has been solved as optimisation one. The optimisation criterion used was the quadratic sum of the differences between the computed and measured temperature data.