Parameter identification from SSFR tests and d-q model validation of synchronous generator

Abstract

This paper introduces a fast parameter identification technique for a two-order d-q model of a synchronous generator from Standstill Frequency Response (SSFR) tests. This identification method is based on a modified SSFR test and the curves of the no-load and sustained short-circuit tests. This allows the lowest SSFR frequency to be 0.01Hz instead of 0.001Hz. The phase and field resistances are measured from fast and precise DC tests during the SSFR test. In this work, the value of the unsaturated synchronous inductance is defined from the no-load air gap linearization and the short-circuit saturation curve. This definition fits better when the saturation is considered and we present how to implement this approach with the Matlab-Simulink SimPowerSystem standard d-q models. Validations are made using sudden short-circuit tests at nominal field current to evaluate d-q model performances with magnetic saturation.