Corrections to 'Model Predictive Control with Common-Mode Voltage Injection for Modular Multilevel Converter'

The authors Dekka et al. proposed a model predictive control with common-mode voltage injection for modular multilevel converters in the paper published in IEEE Trans. Power Electron., vol. 32, no. 3, pp. 1767-1778, Mar. 2017. As a part of implementation and analysis, a detailed mathematical model of various current components including input current (i-s), output current (i-x), and circulating current (i-{xz}) are developed. During the review, we found some minor mistakes in the discrete-time model of the circulating current. In this correspondence, the authors present a detailed derivation of the revised circulating current model.