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

The authors Dekka etal. 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. 17671778, 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.