Abstract
In this paper a novel packed U cell (PUC) based multilevel grid connected inverter is proposed. Unlike the U cell arrangement which consists of two power switches and one capacitor, in the proposed converter topology a lower DC power supply from renewable energy resources such as photovoltaic arrays (PV) is used as a base power source. The proposed topology offers higher efficiency and lower cost using a small number of power switches and a lower DC power source which is supplied from renewable energy resources. Other capacitor voltages are extracted from the base lower DC power source using isolated DC-DC power converters. The operation principle of proposed transformerless multilevel grid connected inverter is analyzed theoretically. Operation of the proposed multilevel grid connected inverter is verified through simulation studies. An experimental prototype using STM32F407 discovery controller board is performed to verify the simulation results.
Highlights
In this paper a novel packed U cell (PUC) based multilevel grid connected inverter is proposed
The PUC topology needs only one high voltage DC power supply and the lower voltage levels are automatically generated with switching operation in packed U cell capacitors
The V1 dc bus is assumed to be 110 V and the V2 dc bus is generated from an isolated push pull DC-DC converter or a forward converter
Summary
In this paper a novel packed U cell (PUC) based multilevel grid connected inverter is proposed. The PUC topology needs only one high voltage DC power supply and the lower voltage levels are automatically generated with switching operation in packed U cell capacitors. Unlike the PUC topology, a lower DC power supply from renewable energy resources such as photovoltaic arrays (PV) is used as a base power source. In this case, the total voltage levels (TVL) are calculated as follows. 7-level output voltage of the proposed 3-cell PUC based grid connected inverter.
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