The paper presents two methods, dc decay test and standstill frequency response (SSFR) test, used to estimate the parameters of the synchronous machine mathematical model. The synchronous and differential magnetization inductances, the resistances and leakage inductances of equivalent rotor circuits for starting and damping squirrel cages, as well as the incremental magnetization inductances are determined by experimental tests. Magnetic saturation is taken into account through synchronous and differential magnetization inductances variation against total magnetization current and the skin effect is considered by using rotor short-circuited windings with constant parameters. The d-q rotor coordinate system is used, mathematical computations are done using Matlab-Simulink professional program, while for experimental tests high performance measuring apparatus were used.

Keywords: Synchronous machine, Parameter estimation, Dc decay test, Standstill frequency response (SSFR) test