Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 34, Issue 1, Pages 184-191Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2018.2827947
Keywords
Current stress; dc-ac converter; low frequency; medium voltage; modular multilevel converter (MMC); multilevel converter
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Flying-capacitor modular multilevel converter (FC-MMC) overcomes the zero/low-fundamental-frequency operation issues of conventional MMC without injecting common-mode voltage. However, the FC-MMC suffers from high current stress due to the large amplitude of inner high-frequency current. The square-wave design for the inner high-frequency components could effectively reduce the current stress, but the per-phase LC circuit (formed by arm inductor and flying capacitor) challenges the square-wave current control. This paper investigates the equivalent LC circuit in FC-MMC, and proposes a control method to improve the performance of inner current control. Accordingly, the desired square wave is achieved for inner high-frequency current. The current stresses on semiconductor switches and flying capacitor are reduced by around 25% and 45%, respectively. Simulation and experimental results prove the effectiveness of the proposal.
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