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In this paper, a modulation strategy based on zero-sequence voltage injection is proposed for module multilevel converter (MMC). By the proposed method, the remaining capacitor voltages not vary and the line-to-line voltages are balanced. This method is easy to be implemented by adjusting the voltage injection coefficient when SM fault occurs. The coefficient of injected zero-sequence voltage is designed...
Considering the control complexity of modular multilevel converter(MMC) under high-voltage high-power application with too many sub-modules, an improved hierarchical control structure consisted of three-level controller is proposed, to solve the synchronization and low reliability problems of the traditional control system in this paper. Framework structure and implementation of the hierarchical control...
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