Abstract—It
is important to improve the overall efficiency of a photovoltaic (PV) inverter
when it is connected to the grid. Fundamentally, the conversion efficiency from
dc to ac power of an inverter is important. However, in the presence of partial
shading, maximum power point tracking (MPPT) on PV modules is more important
than the conversion efficiency. In this paper, a new control method for a
three-level inverter is proposed.With the proposed method, each dc-link voltage
of the three-level inverter can be asymmetrically regulated. When PV modules are
split into two and each split module is connected to the respective dc-link
capacitors of the inverter, the asymmetric control can be helpful because
separateMPPTs are possible. The effectiveness of the proposed method was
examined through experiments with a T-type three-level inverter, where each
dc-link capacitor was supplied by a PVsimulator emulating two separate
PVmodules under different shading conditions.
(Index
Terms—Asymmetric voltage control, grid-connected inverter, maximum power point
tracking (MPPT), photovoltaic (PV), three-level inverter.)
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