Generating multisinusoidal test signals by using a VSI for the identification of synchronous machines

Despite the effectiveness of the standstill frequency-response test or SSFR test in identifying accurate electrical machine models, it has the disadvantage of being a time consuming method. Therefore the use of a broadband signal is proposed instead of the excitation of only one frequency in the test signal and this sequentially for different signal frequencies. Furthermore, the test signals are often generated by using a waveform generator externally applied to the machine, which is not commonly available in the field. In this paper the generation of broadband test signals by using a voltage-source inverter (VSI) resulting in a multisine SSFR test is discussed. Using this multisine SSFR test the influence of saturation and cross-saturation on the q- and d-axis parameters can be swiftly evaluated.