MMC-Based PV Single-Phase System with Distributed MPPT

Simone Barcellona, Marzio Barresi and Luigi Piegari
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Simone Barcellona: Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milano MI, Italy
Marzio Barresi: Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milano MI, Italy
Luigi Piegari: Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milano MI, Italy

Energies, 2020, vol. 13, issue 15, 1-17

Abstract: 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.

Keywords: modular multilevel converter; PV panel; MPPT; distributed MPPT (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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