A Flyback-Assisted Single-Sourced Photovoltaic Power Conditioning System Using an Asymmetric Cascaded Multilevel Inverter


Vol. 16, No. 6, pp. 2272-2283, Nov. 2016
10.6113/JPE.2016.16.6.2272


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 Abstract

This paper proposes a power conditioning system (PCS) for distributed photovoltaic (PV) applications using an asymmetric cascaded multilevel inverter with a single PV source. One of the main disadvantages of the cascaded multilevel inverters in PV systems is the requirement of multiple isolated DC sources. Using multiple PV strings leads to a compromise in either the voltage balance of individual H-bridge cells or the maximum power point tracking (MPPT) operation due to localized variations in atmospheric conditions. The proposed PCS uses a single PV source with a flyback DC-DC converter to facilitate a reduction of the required DC sources and to maintain the voltage balance during MPPT operation. The flyback converter is used to provide input for low-voltage H-bridge cells which processes only 20% of the total power. This helps to minimize the losses occurring in the proposed PCS. Furthermore, transient analyses and controller design for the proposed PCS in both the stand-alone mode and the grid-connection mode are presented. The feasibility of the proposed PCS and its control scheme have been tested using a 1kW hardware prototype and the obtained results are presented.


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Cite this article

[IEEE Style]

M. S. Manoharan, A. Ahmed, J. Park, "A Flyback-Assisted Single-Sourced Photovoltaic Power Conditioning System Using an Asymmetric Cascaded Multilevel Inverter," Journal of Power Electronics, vol. 16, no. 6, pp. 2272-2283, 2016. DOI: 10.6113/JPE.2016.16.6.2272.

[ACM Style]

Mohana Sundar Manoharan, Ashraf Ahmed, and Joung-Hu Park. 2016. A Flyback-Assisted Single-Sourced Photovoltaic Power Conditioning System Using an Asymmetric Cascaded Multilevel Inverter. Journal of Power Electronics, 16, 6, (2016), 2272-2283. DOI: 10.6113/JPE.2016.16.6.2272.