Performance analysis of capacitor voltage balancing in modular multilevel converter by sorting algorithm

Ali Salam Al-Khayyat (University of Thi-Qar)
Amel Ahmad Ridha (University of Kufa)
Haider Fadel (University of Thi-Qar)

International Journal of Power Electronics and Drive Systems (IJPEDS)
Vol 13, No 3: September 2022

Due to the modularity of modular multilevel converter (MMC), therefore it has been considered as a substitute for the diode-clamp multilevel inverter in applications of high-voltage high-power. Where it can obtain any level of voltage without imposing complexity on the control system. This study analyses in detail the operation principle and balances the capacitor voltage of sub-module (SM) in modular multilevel converter by sorting algorithm. The output voltage control and capacitor voltage balancing technique are confirmed by MATLAB/Simulink and the obtained result has been discussed, where the capacitor voltage of the sub-module has controlled within the acceptable deviation limit, which is 5-10%. In addition, the circulating current has been controlled and reduced.