Frequency Domain Identification of Synchronous Machines by Multisine Excitation

Modelling and identification of synchronous machiens has attracted much attention during the past decades. Although the standstill frequency response (SSFR) method has become standardized (IEEE STd. 115) it has some disadvantages (e.g. it is a time consuming method). Therefore, the use of multisine excitation has been proposed in the literature. In this paper the use of multisine excitation for the freqauency domain identification of permanent magnet synchronous machines is discussed. The selection of the applied excitation signal and the measurement set-up are dealt with. Different applications for the frequency domain data are given. Furthermore the extraction of a parametric model from the nonparametric frequency domain data is discussed. Measurment results and their processing are discussed for different types of synchronous machines to demonstrate that multisine frequency domain identification can be applied to extract the parameters (inductances) of permanent magnet syncrhonous machines. These parameters can then be used to study the influence of saturation or can be applied in the simulation and control of permanent magnet synchronous machines.