Constant common-mode voltage strategies using sigma-delta modulators in five-phase VSI
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
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ProjectSISTEMA DE CONVERSION DE POTENCIA DC%2FDC AISLADO MULTIPUERTO DE ALTA EFICIENCIA Y DENSIDAD DE POTENCIA BASADO EN DISPOSITIVOS DE AMPLIO ANCHO DE BANDA PARA VEHICULOS ELECTRICOS (AEI-PID2019-111420RB-I00)
This paper proposes and studies different sigma-delta () modulation strategies for obtaining a constant common-mode voltage (CMV) by eliminating the CMV level transitions in a five-phase voltage source inverter (VSI). These techniques are based on choosing vectors that generate a constant CMV with values of 0.1Vdc or 0.1Vdc. Because of the high-switching frequencies used with wide-bandgap semiconductors, pulse-width modulation (PWM) techniques continually generate high dv/dt values. Therefore, the proposal to combine a modulation strategy with vector selections achieves: 1) a constant CMV level due to the elimination of its level transitions; 2) a reduction in conducted electromagnetic interference; and 3) a high-efficiency converter operation. The average number of switching per transistor of the VSI is analyzed using the results from Matlab/Simulink and PLECS simulations. Experimental results are obtained by applying the proposed modulation strategies on a VSI with silicon carbide (SiC) MOSFETs. The results demonstrate the achievement of the aforementioned features.
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CitationAcosta, F. [et al.]. Constant common-mode voltage strategies using sigma-delta modulators in five-phase VSI. "IEEE transactions on industrial electronics", 3 Maig 2022,