标题：Loss reduction analysis and control of AC-voltage-boosted FBSM MMC by injecting second harmonic circulating current

作者：Xiang, MC; Hu, JB ; He, ZY

摘要：Reducing the power loss and handling short-circuit faults in HVDC systems are crucial for economical and reliable operation of modular multilevel converters (MMC). This paper proposes a loss reduction method for AC voltage-boosted FBSM-MMC by controlling the second harmonic component in the circulating current. The relationship between converter loss and second harmonic circulating current (SHCC) is first derived for AC voltage-boosted FBSM-MMC. From the analysis, it can be seen that the converter loss can be reduced by injecting the optimal SHCC into the arm current. The topology comparison between traditional FBSM-MMC and AC voltage-boosted FBSM-MMC is carried out to show the benefit of this method. Simulation results using PSCAD/EMTDC confirm the feasibility and validity of the proposed loss reduction method for AC voltage-boosted FBSM-MMC.

发表于：JOURNAL OF ENGINEERING-JOE（MAR 2019）