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

Anirudh Budnar Acharya; Dezso Séra; Remus Teodorescu; Lars Einar Norum

doi:10.3390/en13102619

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

Anirudh Budnar Acharya, Dezso Séra, Remus Teodorescu, Lars Einar Norum

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

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.

Original language	English
Article number	2619
Journal	Energies
Volume	13
Issue number	10
ISSN	1996-1073
DOIs	https://doi.org/10.3390/en13102619
Publication status	Published - May 2020

Keywords

Control system
Distributed renewable energy source
Grid integration
Modular multilevel converter
Photovoltaic power system

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10.3390/en13102619Licence: CC BY 4.0

Open Access versionFinal published version, 23.9 MBLicence: CC BY 4.0

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title = "Modular Multilevel Converter for Photovoltaic Application with High Energy Yield under Uneven Irradiance",

abstract = "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. ",

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AU - Acharya, Anirudh Budnar

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AU - Teodorescu, Remus

AU - Norum, Lars Einar

PY - 2020/5

Y1 - 2020/5

N2 - 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.

AB - 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.

KW - Control system

KW - Distributed renewable energy source

KW - Grid integration

KW - Modular multilevel converter

KW - Photovoltaic power system

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M3 - Journal article

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JF - Energies

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

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