Decentralised Control for Balancing the Cell-Voltages of a High Conversion Ratio Flying Capacitor Multilevel Converter - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue IEEE Journal of Emerging and Selected Topics in Industrial Electronics Année : 2021

Decentralised Control for Balancing the Cell-Voltages of a High Conversion Ratio Flying Capacitor Multilevel Converter

Marc Cousineau
Rafael Diez
Philippe Ladoux
Joseph Fabre
Miguel Mannes
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Diego Patino
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Résumé

This paper presents a decentralised control strategy for the balancing of the cell-voltages of a Flying Capacitor Multilevel Converter implementing a large number of cells to address high conversion ratio. The originality of this work is that no reference is required for regulating the capacitor voltages leading to an auto-balance capability. It is composed of several local cell-voltage balancing controllers and a global load-current regulator. For theoretical analysis purpose a change of state-variables is proposed leading to a new model of the converter. Then the study of the decentralised balancing method is performed based on a modal analysis of the system. A decoupling between the output current regulation and the cell-voltage balancing loops is proposed, then observed. The synthesis of the controllers, guaranteeing the stability of the system within a large bandwidth for each mode, is obtained. To address fault-tolerance requirement, this decentralised control strategy provides an interesting ability of auto-reconfiguration allowing to change the number of active cells during operation. Simulations of separated modal responses show the stability and bandwidth of the control loops for DC/DC 500V to 16V high conversion ratio application. Experimental results performed on a 5-cell multilevel converter demonstrate the validity of the proposed control method.
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Dates et versions

hal-03365165 , version 1 (05-10-2021)

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Citer

Miguel Emilio Vivert, Marc Cousineau, Rafael Diez, Philippe Ladoux, Joseph Fabre, et al.. Decentralised Control for Balancing the Cell-Voltages of a High Conversion Ratio Flying Capacitor Multilevel Converter. IEEE Journal of Emerging and Selected Topics in Industrial Electronics, 2021, IEEE Journal of Emerging and Selected Topics in Industrial Electronics, pp.1-1. ⟨10.1109/JESTIE.2021.3115958⟩. ⟨hal-03365165⟩
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