Open AccessHigh-Frequency-Link Modulation Methodology of DC–DC Transformer Based on Modular Multilevel Converter for HVDC Application: Comprehensive Analysis and Experimental Verification
Author(s) -
Biao Zhao,
Qiang Song,
Jianguo Li,
Yu Wang,
Wenhua Liu
Publication year - 2017
Publication title -
ieee transactions on power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.159
H-Index - 266
eISSN - 1941-0107
pISSN - 0885-8993
DOI - 10.1109/tpel.2016.2586196
Subject(s) - power, energy and industry applications , aerospace , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , fields, waves and electromagnetics , general topics for engineers , nuclear engineering , signal processing and analysis , transportation
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 better 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.