Parameter estimation for synchronous machines using numerical pulse test within finite element analysis

This study aims to estimate equivalent circuit parameters for a synchronous machine. The need for equivalent circuits rises from practical applications. Accurate models are needed for control design and power system analysis. The research was conducted using the 2D finite element analysis and the differential evolution algorithm. As an input to the synchronous machine, a pulse is used within the FEA at the rated operation point. The pulse was applied to the line-to-line voltage of the stator. Using the pulse input, the harmonic excitation can be avoided. The input in addition to the response provided the numerical data for estimation. On one hand, theoretical equations based on the equivalent circuits can be derived. The theoretical model was fitted in the numerical data using the least-squares cost formulation, and the DE algorithm was used to minimize the cost function. Results for a 6-pole, 12.5 MW synchronous machine are presented.