Identification of synchronous generator saturation models based on on-line digital measurements

Accurate stability analysis requires the precise modelling of electric machine saturation phenomena. The paper presents a technique suitable for identifying several typical machine saturation models. It is shown that the technique can be used to identify nonlinearities associated with saturation and cross-magnetisation effects. An algorithm is designed to estimate all parameters of the machine models and the associated saturation functions. Numerical studies on a synchronous generator are included, using online measured data of the Taipower system recorded by the plant transient recording and analysis system