Improved Current Reference Calculation for MMCs Internal Energy Balancing Control

The paper addresses an improved inner current reference calculation to be employed in the control of modular multilevel converters operating during either balanced or unbalanced conditions. suggested is derived based on AC and DC additive differential voltage components applied upper lower arms converter. In addition, impacts caused not only by network’s impedances but also MMC’s arm are considered derivation expressions. Another issue discussed this article regards that singular conditions, where positive-sequence component equal negative one, may occur network internally (within converter’s voltages). Several different methods compared their applicability former fault conditions analyzed. presents a detailed formulation applies it grid faults shown presented approach can potentially used maintain internal energy converter normal