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A Family of Single-Stage, Buck-Boost Inverters for Photovoltaic Applications
Open AccessArticle

Modular Multilevel Converter for Photovoltaic Application with High Energy Yield under Uneven Irradiance

1
Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
2
School of Electrical Engineering and Robotics, Queensland University of Technology, Brisbane, QLD 4000, Australia
3
Department of Electric Power Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Energies 2020, 13(10), 2619; https://doi.org/10.3390/en13102619
Received: 3 April 2020 / Revised: 13 May 2020 / Accepted: 18 May 2020 / Published: 21 May 2020
The direct integration of Photovoltaic (PV) to the three-phase Modular Multilevel Converter (MMC) without dc–dc converters results in high-efficiency PV power plant with increased energy yield. The arm power control method for the MMC further improves the extraction of available power under uneven irradiance across different phases of the MMC. However, the uneven irradiance between the sub-modules results in residual voltage that results in harmonics and unbalance components. In this paper, the effect of uneven irradiance across the sub-module of the MMC is investigated with arm power control method. A modified balancing algorithm for the arm power control of the MMC is proposed which enables balanced power to be injected into ac grid despite uneven irradiance across the sub-modules in the MMC. The modified balancing algorithm enables to keep the unbalance in the phase currents below 10% and the Total Harmonic Distortion (THD) is confined as per IEEE 519 standard. View Full-Text
Keywords: modular multilevel converter; photovoltaic power system; grid integration; control system; distributed renewable energy source modular multilevel converter; photovoltaic power system; grid integration; control system; distributed renewable energy source
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MDPI and ACS Style

Acharya, A.B.; Sera, D.; Teodorescu, R.; Norum, L.E. Modular Multilevel Converter for Photovoltaic Application with High Energy Yield under Uneven Irradiance. Energies 2020, 13, 2619.

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