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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/58738

    Título
    Local carrier PWM for modular multilevel converters with distributed PV cells and circulating current reduction
    Autor
    Al-Jawary, Zaid A. H.
    Pablo Gómez, Santiago deAutoridad UVA Orcid
    Herrero de Lucas, Luis CarlosAutoridad UVA
    Martínez Rodrigo, FernandoAutoridad UVA Orcid
    Año del Documento
    2020
    Editorial
    MDPI
    Descripción
    Producción Científica
    Documento Fuente
    Energies 2020, vol.13, n. 21, 5585
    Resumen
    A new topology has been recently proposed for grid-connected photovoltaic (PV) systems, using modular multilevel converters (MMCs) and distributing PV panels throughout the MMC cells. This topology has two main advantages: it reduces the power losses related to moving the energy into the MMC capacitors from an external source, and it removes the losses and costs related to the DC to DC converters used to track the maximum power point on string converters or central converters, because that task is delegated to MMC cells. However, traditional pulse width modulation (PWM) techniques have many problems when dealing with this application: the distortion at the output increases to unacceptable values when MMC cells target different voltages. This paper proposes a new modulation technique for MMCs with different cell voltages, taking into account the measured cell voltages to generate switching sequences with more accurate timing. It also adapts the modulator sampling period to improve the transitions from level to level, an important issue to reduce the internal circulating currents. The proposed modulation has been validated using simulations that show a consistent behavior in the output distortion throughout a wide operation range, and it also reduces the circulating currents and cuts the conduction losses by half. The behavior of this new topology and this new modulation has been compared to the mainstream topology with external PV panels and also to a fixed carrier modulation.
    Materias (normalizadas)
    Tecnología
    Electrónica
    Materias Unesco
    3307 Tecnología Electrónica
    Palabras Clave
    Pulse width modulation
    Modular multilevel converter
    Photovoltaic power systems
    Modulación de ancho de pulso
    Convertidor multinivel modular
    Sistemas de energía fotovoltaica
    Revisión por pares
    SI
    DOI
    10.3390/en13215585
    Version del Editor
    https://www.mdpi.com/1996-1073/13/21/5585
    Propietario de los Derechos
    © 2020 The Authors
    Idioma
    eng
    URI
    https://uvadoc.uva.es/handle/10324/58738
    Tipo de versión
    info:eu-repo/semantics/publishedVersion
    Derechos
    openAccess
    Aparece en las colecciones
    • DEP69 - Artículos de revista [32]
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    Nombre:
    Local-Carrier-PWM-for-Modular.pdf
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    Universidad de Valladolid

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