Modular Multilevel Converter with Inductor Parallel Branch Providing Integrated Partially Rated Energy Storage

Neira, Sebastián; Blatsi, Zoe; Judge, Paul D.; Merlin, Michaël M. C.; Pereda, Javier

doi:10.1109/ecce-asia49820.2021.9479410

Cited by 4 publications

(2 citation statements)

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“…From that perspective, studies in the literature have considered adding an energy storage system to draw the utmost of this degree of freedom, and then the provision of ancillary services would be feasible. Therefore, the integration of energy storage systems within MMCs have received significant interest in recent years [10][11][12][13][14][15][16][17]. Notably, a CIGRE working group (WG B4-84) was recently created in 2021 to deal with the feasibility and application of electric energy storage systems embedded in HVDC systems.…”

Section: Introductionmentioning

confidence: 99%

“…Several approaches have been explored in recent years. In [14], a cascaded H-bridge branch that was parallel with a portion of an arm is used to provide an integrated energy storage system; [15] proposed a storage that was parallel with the arm inductors. However, the modularity of an MMC allows the energy storage elements (ESEs) to be implemented locally within each SM to make energy storage submodules (ES-SMs).…”

Section: Introductionmentioning

confidence: 99%

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

2022

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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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