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In this paper, a dedicated pulse width modulation
(PWM) technique specifically designed for single-phase (or four
wire three-phase) multilevel Cascaded H-Bridge Converters is
presented. The aim of the proposed technique is to minimize the
DC-Link voltage unbalance, independently from the amplitude
of the DC-Link voltage reference, and compensate the switching
device voltage drops and on-state resistances. Such compensation
can be used to achieve an increase in the waveform quality of
the converter. This is particularly useful in high-power low supply
voltage applications where a low switching frequency is used. The
DC-Link voltage balancing capability of the method removes
the requirement for additional control loops to actively balance
the DC-Link voltage on each H-Bridge, simplifying the control
structure. The proposed modulation technique has been validated
through the use of simulation and extensive experimental testing
to confirm its effectiveness
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