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Multilevel inverters supplied by independent sources are increasingly studied to connect these sources to grid. One of the challenges is voltage balancing. Indeed, when supplying powers coming from renewable sources are different, the inverter input voltages are unbalanced. In this paper, a stable DC bus voltage balancing technique without modifying MPPT algorithm is presented. This allows an MPPT...
To suppress the common mode current flowing into the grid effectively, this paper presents a novel active clamping inverter topology with non-isolated single-phase photovoltaic grid inverters. This topology can provide freewheeling path and separate solar panels from the grid at the freewheeling stage. In addition, a series resistor in the clamping channel of the new structure is added, which can...
This paper investigates the modern topology of multilevel converters, which are suitable for use in high power photovoltaic applications with the focus on achieving lower total harmonic distortion and better efficiency. Multilevel converters offer several advantages compared to conventional types. Multilevel converters provide high quality output while using the low switching frequency. It affects...
This paper deals with a novel multilevel inverter neutral point (MNP). This system consists of a series of monodirectional and bidirectional switch. If one or several bidirectional power switches of this inverter burn out or to become ruined by reason an over voltage or depreciation, it stays in the previous level. Indeed, for a three-level NP to occur a defect in bidirectional switch (middle switch),...
This paper analyses a possibility for realization of multilevel inverters. After general description of all famous solutions, the focus is paid on diode clamped multilevel inverters (DCMI) and flying capacitor multilevel inverters (FCMI). The comparison of topological structure differences and control strategies is presented. The special focus is paid to balancing of voltages on capacitors. Switching...
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