Control design of Modular Multilevel Converters in normal and AC fault conditions for HVDC grids
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This paper describes a control design strategy of Modular Multilevel Converters (MMC) for High Voltage Direct Current (HVDC) applications to operate during normal and AC fault conditions. First, a steady state analysis of the converter is performed to identify the uses of the current components within the control strategy. Based on the initial stationary study, a complete converter control structure is proposed, which enables full control of the MMC internal energy during normal and AC fault conditions. A detailed design procedure is included for the current and energy regulators, in order to be able to ensure a dynamic response under any grid condition. Finally, theoretical developments are validated through simulation results by means of a detailed model in normal operation and during an AC voltage sag.
CitationEduardo Prieto-Araujo, Junyent, A., Collados, C., Clariana, G., Gomis-Bellmunt, O. Control design of Modular Multilevel Converters in normal and AC fault conditions for HVDC grids. "Electric power systems research", Novembre 2017, vol. 152, p. 424-437.