M. Jafari, Arman Ghasemi, Fatemehalsadat Jafarishiadeh, Amin Shojaeighadikolaei, Sepehr Saadatmand, R. Ahmadi
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Current Stress Reduction Investigation of Isolated MMC-Based DC-DC Converters
In high voltage direct current (HVDC) and medium-voltage DC (MVDC) grids, isolated modular multilevel converter (MMC)-based DC-DC (IMMDC) converter plays an important role for voltage matching, electric isolation, and power transfer between DC buses. This paper proposes conjoined phase-shift amplitude-ratio (PSAR) index control for IMMDCs. The proposed method uses amplitude ratio index of MMC legs of medium-frequency transformer’s (MFT) secondary side as additional control variables. Compared with conventional single-phase-shift (SPS) control, PSAR control not only provides wider transmission power range and enhances operation flexibility, but also reduces current stress on the MFT and power switches of MMCs. Comprehensive theoretical analysis is provided based on mathematical modeling to show the performance of the converter with SPS and PSAR control. The accuracy of derived formulations and the operation of PSAR control is verified.
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