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Photovoltaic systems technological development is driven by the request for higher efficiency and safety. These concerns influence also the choice of the power converter stage. Several topologies have been proposed and many of them are available commercially. Among them, the neutral point clamped (NPC) and derived topologies offers high efficiency, low leakage current, and low EMI. However, one main...
Conergy NPC topology is a new topology derived from classical NPC topology. Due to its higher efficiency, less components and better EMI performance compared with three phase full bridge topology and classical NPC topologies, it was already used in photovoltaic inverters and other power electrical applications. This paper conducts a comparison between traditional NPC topology and Conergy NPC topology...
Due to the “Hard Drive” technique implemented by the integrated Gate-Unit, “Integrated Gate-Commutated thyristor” (IGCT) has lots of outstanding features and becomes the best choices of medium voltage applications. In three level NPC IGCT converter, because of the complex commutation transient process, the IGCT works in different conditions such as anti-parallel diode forward recovery, reverse recovery,...
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