Abstract:
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This letter introduces a new series of multilevel (ML)
converters based on the ML clamping concept. By applying this
technique, a ML clamping unit (MCU) conveys additional levels
for synthesizing the output waveforms of a diode-clampedML dc–
ac power converter. The basic building block of the ML clamping
scheme is the ML clamping cell, which is composed of a pair of dc
sources associated with one single-pole/triple-throw type of switch
arrangement. The number of series-connected ML-clamping cells
will set the number of levels of the synthesized waveform. By depending
on the MCU arrangements, different converter configurations
can be derived, namely, the common clamping and the
modular types. Both approaches can be accomplished by employing
classical three-level neutral-point-clamped (NPC) technology.
Thus, the overall structure of the resultant converter is kept simple,
wherein the number of parts count can be reduced, when
compared with conventional NPC counterparts. In this letter, emphasis
is given on the common clamping converter configuration.
The attractiveness of the proposed ML concept is evidenced
by conducting a comparative cost analysis. Experimental results
are presented as a practicality proof of the proposed ML power
converter. |