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In this paper, the conventional three-level diode-neutral-point-clamping (3L-DNPC) inverter is deeply investigated from the view of power loss. It is concluded that the conventional 3L-DNPC inverter has high zero-vector conduction loss due to clamping Diode+ IGBT structure's high on-state voltage, high clamping diode reverse recovery loss and so on. Therefore, the clamping diodes are most deeply related...
An advanced gate drive unit for 1.2 kV IGBT modules has been developed. It includes two main features: limitation of the collector-emitter voltage slope and of the collector-emitter peak voltage. This is achieved through a feedback loop with a capacitive/resistive voltage divider coupled to the gate-emitter voltage of the IGBT. For the studied case a reduction of the switching losses of around 25%...
The grid-connected photovoltaic (PV) systems are an important part of renewable energy sources and their integration is getting more and more widespread. In order to improve the efficiency, practicality and reliability of the PV systems, many kinds of new inverter topologies have been proposed to avoid using a grid isolation transformer. The NPC topology and two other derived topologies are presented...
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