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With voltage-balancing control, the voltage difference among sub-module (SM) capacitors in a modular multilevel converter can be reduced. However, this comes at the cost of increased device switching frequency. In this paper, the relationship between the switching frequency and SM capacitor unbalanced voltage is investigated. As the relationship depends on the voltage-balancing control schemes, a...
Eliminating the spurious turn-on in the bridge-leg configuration plays an important role in preventing excessive switching loss, self-oscillation and shoot-through. A passive level-shifter is proposed to superimpose a negative gate voltage to bring down the spurious triggering pulse and thereby avoid the spurious turn-on. The merits of the devised auxiliary circuit lie not only in that it consists...
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