Frequency response analysis on rotating machines – accuracy of a manual versus a semi-automated model parameterization

Inhalt:
Frequency Response Analysis (FRA) shows promising potential as a diagnostic method for rotating machines. A simula-tion of the frequency response can offer an in-depth analysis and increase the understanding of the characteristics of the measurement. Up until now, the in-depth analysis of the changes and resulting fault diagnosis requires expert knowledge. To overcome this challenge, investigations towards an automated analysis are performed here. In this work, frequency responses of synchronous and induction machines are simulated using an existing single-phase grey box model. The aim is to show which accuracy a simulated frequency response can achieve with a manual and a semi-automated model pa-rameterization and whether one of these methods is preferable. An explanation of how the different parameterization methods are implemented and the differences between them is provided. In order to be able to make exemplary observa-tions, several frequency responses of synchronous and induction machines of different power classes are parameterized manually and semi-automatically. Characteristics can be very well reproduced with both approaches, but some areas still show significant deviations. It is shown that both parametrizations usually show deviations to the measurement in the same frequency ranges. With the measurements examined, manual and semi-automated parameterization provide very similar accuracy, so that no method is clearly preferrable. The deviations that occurred and their possible causes are also discussed.