Asymmetric control of dc link voltages for separate mppt’s in three-level inverters
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The document proposes a new control method for a three-level inverter that allows the DC-link voltages to be regulated asymmetrically. This would allow photovoltaic modules to be split into two groups, with each group connected to a separate DC-link capacitor, enabling separate maximum power point tracking for each group. The method was tested experimentally using a T-type three-level inverter with each DC-link capacitor supplied by a PV simulator emulating two PV modules under different shading conditions.
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Asymmetric control of dc link voltages for separate mppt’s in three-level inverters
- 1. ASYMMETRIC CONTROL OF DC-LINK VOLTAGES FOR SEPARATE MPPT’S IN THREE-LEVEL INVERTERS 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 separate MPPTs 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 PV simulator emulating two separate PV modules under different shading conditions.