Enhanced Modular Multilevel Converter for HVdc Applications: Assessments of Dynamic and Transient Responses to AC and DC Faults

This article describes the operating principles and theoretical relationships that underpin the modeling and control system of the enhanced modular multilevel converter (EMMC). A full-scale model of a point-to-point high-voltage direct current (HVdc) link that employs EMMCs is used to examine its performance during normal operation in all four quadrants and resiliency to symmetrical and asymmetric...