The exploitation of the dc-link in multiphase inverters raises the problem of overmodulation, which has some peculiar traits compared to three-phase inverters. Typically, overmodulation allows exploiting the dc-bus voltage but suffers from the harmonic distortion of the output voltage. In multiphase inverters, overmodulation causes the pollution of the harmonic subspaces, which are usually independent of each other in the linear modulation range. The solution to the problem of the overmodulation is not unique and affects the performance of the drive. Several overmodulation techniques, which differ in the optimized quality index, have already been proposed for five- phase inverters in the literature. The contribution of this paper is to show with a rigorous analysis that the overmodulation problem can be transformed into a set of trigonometric inequalities, which can be easily solved. Experimental tests on a five-phase induction motor drive are carried out to verify the feasibility of the developed techniques and the quality of the current waveforms.
Vancini L., Mengoni M., Sala G., Rizzoli G., Zarri L., Tani A. (2020). A Trigonometric Solution to the Problem of Overmodulation in Five-Phase Inverters. Institute of Electrical and Electronics Engineers Inc. [10.1109/ECCE44975.2020.9235860].
A Trigonometric Solution to the Problem of Overmodulation in Five-Phase Inverters
Vancini L.;Mengoni M.;Sala G.;Rizzoli G.;Zarri L.;Tani A.
2020
Abstract
The exploitation of the dc-link in multiphase inverters raises the problem of overmodulation, which has some peculiar traits compared to three-phase inverters. Typically, overmodulation allows exploiting the dc-bus voltage but suffers from the harmonic distortion of the output voltage. In multiphase inverters, overmodulation causes the pollution of the harmonic subspaces, which are usually independent of each other in the linear modulation range. The solution to the problem of the overmodulation is not unique and affects the performance of the drive. Several overmodulation techniques, which differ in the optimized quality index, have already been proposed for five- phase inverters in the literature. The contribution of this paper is to show with a rigorous analysis that the overmodulation problem can be transformed into a set of trigonometric inequalities, which can be easily solved. Experimental tests on a five-phase induction motor drive are carried out to verify the feasibility of the developed techniques and the quality of the current waveforms.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
