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Open AccessFeature PaperArticle

MMC-Based PV Single-Phase System with Distributed MPPT

Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milano MI, Italy
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Energies 2020, 13(15), 3964; https://doi.org/10.3390/en13153964
Received: 26 June 2020 / Revised: 24 July 2020 / Accepted: 27 July 2020 / Published: 1 August 2020
The presence and evolution of static power converters in electric grids are growing on a daily basis. Starting from the most used voltage source converter (VSC), passing through the use of multilevel converters, the most recent configuration is the so-called modular multilevel converter (MMC). Because of its intrinsic advantages, it is used not only in high-voltage systems but also in low- and medium-voltage ones to interface renewable energy sources such as photovoltaic (PV) panels. Several configurations and maximum power point tracker (MPPT) algorithms have been proposed and analyzed for MMC-PV-based systems. However, when using distributed MPPTs, partial shading conditions cause a problem. The PV panel can be directly connected to the MMC using its dc link or submodule. Based on this configuration, this paper proposes a novel control strategy that tracks both the ac grid current and ac circulating current for a single-phase low-voltage system to obtain the maximum power under any irradiance condition. The effectiveness of the proposed control strategy is demonstrated through time-domain simulation results. View Full-Text
Keywords: modular multilevel converter; PV panel; MPPT; distributed MPPT modular multilevel converter; PV panel; MPPT; distributed MPPT
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Barcellona, S.; Barresi, M.; Piegari, L. MMC-Based PV Single-Phase System with Distributed MPPT. Energies 2020, 13, 3964.

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