期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 32, 期 5, 页码 3413-3424出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2016.2586196
关键词
DC transformer; dual active bridge; high-frequency link (HFL); high-voltage dc (HVDC); multilevel modular converter (MMC); phase shift
资金
- National Natural Science Foundation of China [51507089]
This paper presents a comprehensive theoretical analysis and experimental verification of high-frequency-link (HFL) modulation of dc-dc transformer (abbreviated as MMDCT) based on the modular multilevel converter (MMC). Three typical HFL dual-active phase-shift modulations are analyzed. Particularly, the HFL voltage, current and power characterization, and different kinds of rating current of the MMDCT during different modulations with the same transmission power are compared comprehensively. On this basis, the detailed switching characterization is presented and the control complexity of the MMDCT during different modulations is discussed. Compared with triangular and sine modulations, square modulation has bettern HFL and switching performances, especially the control is simpler, which are different with the conclusion in traditional line-frequency ac application of the MMC. At last, experimental results verify the theoretical analysis.
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