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This paper proposes a new single-phase H-Bridge transformerless inverter with common ground for grid-connected photovoltaic systems (hereafter it is called ‘Siwakoti-H’ inverter). The inverter works on the principle of flying capacitor and consists of only four power switches (two reverse blocking IGBT's (RB-IGBT) and two MOSFET's), a capacitor and a small filter at the output stage. The proposed...
Nested Neutral-Point-Clamped (NNPC) converter is a newly proposed 4-level converter. It has advantages similar to other multilevel converters but has disadvantages caused by the difficulties in balancing the voltages on its flying capacitors. This will limit its application in Variable Frequency Drive (VFD) system — an important application area for multilevel converters. In order to improve the flying...
This paper introduces a new control method for dc-dc flying capacitor multi-level converters. Depending on the operating conditions, introduced controller dynamically changes the number of operating converter's levels to minimize the output inductor current ripple improving power processing efficiency. For the converters with a narrow conversion range this controller also allows for a significant...
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