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Energy transfer analysis for capacitor voltage balancing of modular multilevel converters

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Figure

Fig. 2: Energy transfer analysis in an MMC, (a) phase energy transfer (a)                            (b)                            (c)analysis, (b) Arm energy transfer analysis, (c) SM energy transfer analysis
Fig. 3  Proposed hierarchical voltage balancing control scheme.
Fig. 5. Block diagram of the phase balancing controller and the arm balancing controller: (a) Phase balancing controller
Fig. 8 presents the experimental results without any balancing control method. It is clear that there is a severe
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