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    A comparative evaluation of modulation strategies for Hexverter–based Modular Multilevel Converters
    (IEEE, 2019-02)
    Robles-Campos, Héctor R.  
    ;
    Mancilla-David, Fernando
    In this work two different modulation strategies termed: i) nearest level control, and ii) phase disposition-sinusoidal pulse width modulation, are described, simulated and compared when applied to a Hexverter-based modular multilevel converter. In addition, two different voltage balancing algorithms are implemented and evaluated. Furthermore, total harmonic distortion regarding three-phase system voltages are assessed. In the end, synthesized branch voltage spectrum for each modulation strategy is analyzed.
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    Optimized Packing of Object Clusters with Balancing Conditions
    (2020)
    Romanova, T.
    ;
    Pankratov, A.
    ;
    Litvinchev, Igor
    ;
    Marmolejo Saucedo, José Antonio
    Packing clusters composed of non-overlapping non-identical convex objects is considered. The packing problem, originally stated in Romanova et al. (Math Probl Eng 2019:Article ID 4136430, 12 pages, 2019), is extended here by introducing balancing (equilibrium) conditions. Packing clusters into a rectangular container is considered. Objects in the cluster are of the same shape and allowed to be continuously translated and rotated subject to maximum distance between clusters. This problem is referred to as a sparse equilibrium packing of clusters and formulated as a nonlinear optimization problem. An algorithmic approach to find a locally optimal solution is developed. Computational results are presented to support efficiency of the method for packing clusters with and without balancing conditions. © Springer Nature Switzerland AG 2020.
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