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Theses

Small- signal stability analysis of Modular Multilevel Converters and application to MMC –based Multi-Terminal DC grids

Abstract : This thesis deals with the modeling and control of MMCs in the context of MTDC. The first objective is to obtain an MMC model in dq frame which can reproduce accurately the AC- and DC- interactions, while representing at the same time the internal dynamics which may interact with the rest of the system. This model is suitable to be linearized and to study its stability, among other linear techniques. Then, based on the developed dq model, different control strategies are developed based on the state-of-the-art on MMC controllers. Since the order of the system may be a limiting factor for studying MTDC grids with many MMCs, different reduced-order models are presented and compared with the detailed dq model. Finally, the developed MMC models with different controllers are used for the MTDC studies. The impact of the chosen controllers of each MMC is evaluated, highlighting the potential issues that may occur in multivendor schemes.
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https://tel.archives-ouvertes.fr/tel-01806049
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Submitted on : Monday, June 18, 2018 - 11:57:11 AM
Last modification on : Saturday, October 17, 2020 - 12:53:06 AM
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  • HAL Id : tel-01806049, version 2

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Julian Freytes. Small- signal stability analysis of Modular Multilevel Converters and application to MMC –based Multi-Terminal DC grids. Other. Ecole Centrale de Lille, 2017. English. ⟨NNT : 2017ECLI0022⟩. ⟨tel-01806049v2⟩

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