Iterative procedure for determination of synchronous generator load point using finite element method

Abstract

Periodical changes in the magnetic field of a synchronous generator, and its mechanical or electrical unbalances, have effect on the armature voltage, current and electromagnetic forces. Determination of these values during the design stage of a machine gives insight in its possible operation problems, and enables their easier prevention. Quantities of interest can be determined by using the finite element method calculations. However, in order to obtain data that correspond to real working conditions of a machine, simulations of different operation points have to be done. The procedure described here provides algorithm for determination of synchronous generator load condition parameters. It relates to symmetrical 3-phase load, it is based on physically measurable values, and can be universally used on any synchronous generator with field winding. This method was applied on a 34 MVA generator and the obtained results show good agreement with the measured data.