Switched-capacitor-based multilevel inverter for grid-connected photovoltaic application

HK Jahan, M Abapour - IEEE Transactions on Power …, 2020 - ieeexplore.ieee.org
IEEE Transactions on Power Electronics, 2020ieeexplore.ieee.org
In order to approach a voltage of high magnitude in photovoltaic (PV) application, several
PV modules are connected in series to form a PV string, then the voltage of PV string is
converted to an ac voltage through an H-bridge inverter. This system causes harmful
harmonics, brings about leakage current, and increases the voltage stress of the
components. To tackle the issue, this article proposes a new switched-capacitor-based
multilevel inverter topology that uses series-connected dc sources as the input dc source …
In order to approach a voltage of high magnitude in photovoltaic (PV) application, several PV modules are connected in series to form a PV string, then the voltage of PV string is converted to an ac voltage through an H-bridge inverter. This system causes harmful harmonics, brings about leakage current, and increases the voltage stress of the components. To tackle the issue, this article proposes a new switched-capacitor-based multilevel inverter topology that uses series-connected dc sources as the input dc source and generates a staircase ac voltage of high quality and mitigates the leakage current. The proposed topology can be constructed as a three-phase inverter as well, in the three-phase configuration all the phases are connected to only one series-connected PV module or dc sources. Simulation and experimental results are provided to validate the proposed topology.
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