Constant Common-Mode Voltage Strategies Using Sigma–Delta Modulators in Five-Phase VSI
IEEE Transactions on Industrial Electronics(2023)
摘要
This article proposes and studies different sigma–delta (
$\Sigma$
$\Delta$
) 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 0.1
$V_{\text{dc}}$
or –0.1
$V_{\text{dc}}$
. Because of the high-switching frequencies used with wide-bandgap semiconductors, pulse-width modulation techniques continually generate high d
v
/d
t
values. Therefore, the proposal to combine a
$\Sigma$
$\Delta$
modulation strategy with vector selections achieves a constant CMV level due to the elimination of its level transitions, a reduction in conducted electromagnetic interference and 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
$\Sigma$
$\Delta$
modulation strategies on a VSI with silicon carbide MOSFETs. The results demonstrate the achievement of the aforementioned features.
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关键词
Common-mode voltage (CMV),five-phase voltage source inverter (VSI),power losses,sigma–delta ( $\Sigma$ $\Delta$ ) modulation,total harmonic distortion (THD),wide-bandgap (WBG) devices
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