Design Methodology Based on Prebuilt Components for Modular Multilevel Converters with Partial Integration of Energy Storage Systems

To provide ancillary services in HVDC applications, modular multilevel converters (MMCs) with integration of energy storage systems are a promising solution as they take advantage of the modularity and the controllability of the stored energy. In these solutions, an energy storage system is connecte...

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Main Authors: Florian Errigo, Leandro De Oliveira Porto, Florent Morel
Format: Article
Language:English
Published: MDPI AG 2022-07-01
Series:Energies
Subjects:
Online Access:https://www.mdpi.com/1996-1073/15/14/5006
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author Florian Errigo
Leandro De Oliveira Porto
Florent Morel
author_facet Florian Errigo
Leandro De Oliveira Porto
Florent Morel
author_sort Florian Errigo
collection DOAJ
description To provide ancillary services in HVDC applications, modular multilevel converters (MMCs) with integration of energy storage systems are a promising solution as they take advantage of the modularity and the controllability of the stored energy. In these solutions, an energy storage system is connected to the DC capacitor of a submodule (SM) to make an energy storage submodule (ES-SM). An MMC with partial integration (MMC-PIES) is an MMC with each arm made of a mix of SMs and ES-SMs. In this paper, we propose a novel design methodology for these converters considering they are built based on existing prebuilt submodules, while design methodologies in the literature consider the SM and ES-SM characteristics to be degrees of freedom. Therefore, the proposed approach is closer to an industrial standpoint and computes the minimum number of ES-SMs to comply with requirements. We also include a new optimization method for the circulating currents needed to balance the energy in the SM and ES-SM capacitors. Design scenarios are presented. The results show that the value of the DC capacitance and the current limitation of the switches highly influence the design, restricting the possible operating points. In addition, half-bridge ES-SMs seem to be a more promising solution than full-bridge ES-SMs, reducing the number of ES-SMs.
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spelling doaj.art-a085d143045d4bd482a9281dc2edbbf22023-12-03T14:58:20ZengMDPI AGEnergies1996-10732022-07-011514500610.3390/en15145006Design Methodology Based on Prebuilt Components for Modular Multilevel Converters with Partial Integration of Energy Storage SystemsFlorian Errigo0Leandro De Oliveira Porto1Florent Morel2SuperGrid Institute SAS, 23 rue Cyprian, 69100 Villeurbanne, FranceSuperGrid Institute SAS, 23 rue Cyprian, 69100 Villeurbanne, FranceSuperGrid Institute SAS, 23 rue Cyprian, 69100 Villeurbanne, FranceTo provide ancillary services in HVDC applications, modular multilevel converters (MMCs) with integration of energy storage systems are a promising solution as they take advantage of the modularity and the controllability of the stored energy. In these solutions, an energy storage system is connected to the DC capacitor of a submodule (SM) to make an energy storage submodule (ES-SM). An MMC with partial integration (MMC-PIES) is an MMC with each arm made of a mix of SMs and ES-SMs. In this paper, we propose a novel design methodology for these converters considering they are built based on existing prebuilt submodules, while design methodologies in the literature consider the SM and ES-SM characteristics to be degrees of freedom. Therefore, the proposed approach is closer to an industrial standpoint and computes the minimum number of ES-SMs to comply with requirements. We also include a new optimization method for the circulating currents needed to balance the energy in the SM and ES-SM capacitors. Design scenarios are presented. The results show that the value of the DC capacitance and the current limitation of the switches highly influence the design, restricting the possible operating points. In addition, half-bridge ES-SMs seem to be a more promising solution than full-bridge ES-SMs, reducing the number of ES-SMs.https://www.mdpi.com/1996-1073/15/14/5006high-voltage direct current (HVDC)power convertermodular multilevel converter (MMC)ancillary servicesenergy storage systemdesign methodology
spellingShingle Florian Errigo
Leandro De Oliveira Porto
Florent Morel
Design Methodology Based on Prebuilt Components for Modular Multilevel Converters with Partial Integration of Energy Storage Systems
Energies
high-voltage direct current (HVDC)
power converter
modular multilevel converter (MMC)
ancillary services
energy storage system
design methodology
title Design Methodology Based on Prebuilt Components for Modular Multilevel Converters with Partial Integration of Energy Storage Systems
title_full Design Methodology Based on Prebuilt Components for Modular Multilevel Converters with Partial Integration of Energy Storage Systems
title_fullStr Design Methodology Based on Prebuilt Components for Modular Multilevel Converters with Partial Integration of Energy Storage Systems
title_full_unstemmed Design Methodology Based on Prebuilt Components for Modular Multilevel Converters with Partial Integration of Energy Storage Systems
title_short Design Methodology Based on Prebuilt Components for Modular Multilevel Converters with Partial Integration of Energy Storage Systems
title_sort design methodology based on prebuilt components for modular multilevel converters with partial integration of energy storage systems
topic high-voltage direct current (HVDC)
power converter
modular multilevel converter (MMC)
ancillary services
energy storage system
design methodology
url https://www.mdpi.com/1996-1073/15/14/5006
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