Abstract:
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In this paper a new multilevel power conversion
concept is proposed, whereby an additional auxiliary circuit
composed of multilevel clamping cells is applied to a main DCAC
converter. The resultant structure, the multilevel-clamped
multilevel converter, or simply multilevel-clamped converter
(MLC2), has the number of levels increased, while keeping
circuitry simple, wherein the number of parts count can be
reduced, when compared with classical NPC counterparts.
Hence, the well established three-level neutral-point-clamped
(NPC) technology can be applied, which has been the preferred
choice in medium-voltage (MV) high power industry for several
industrial products. A description of the proposed concept is
provided, on which different topologies are derived. Moreover, a
cost comparison analysis is shown to illustrate their
attractiveness. Simulation and experimental results based on the
space vector pulse width modulation (SVPWM) are shown, in
order to illustrate the operation and effectiveness of the new
multilevel method. |