直流变压器 | Modular Multilevel High-Frequency-Link DC Transformer Based on Dual Active Phase-Shift Principle for Medium-Voltage DC Power Distribution Application
Zhao, Biao; Song, Qiang; Li, Jianguo; Wang, Yu; Liu, Wenhua
(1.Department of Electrical Engineering, Tsinghua University, Beijing; 100084, China; 2. North China Electric Power University, Beijing; 102206, China)
Abstract:
This paper proposes a multilevel high-frequency-link dc transformer (MDCT) based on dual active phase-shift principle for medium-voltage dc (MVDC) power distribution application. The proposed MDCT employs multilevel and multiplex conversion principle, which brings many advantages and makes the operation of MDCT quite different with the traditional dc transformer (TDCT) and modular multilevel converter. Compared to the TDCT scheme, the proposed MDCT has smaller circulating current and higher power factor; it can operate as a dc breaker to cutoff the connection with the MVDC distribution grid absolutely when a short fault occurs in the distribution grid; the redundant design can be achieved when some submodules failure to improve the reliability. In the paper, the topology, operation principle, modulation method, switching characterization, voltage, and power characterization, and control strategy of MDCT are presented and analyzed comprehensively. At last, a MDCT prototype is built and the experimental results verify the correctness and effectively of the proposed solution.
Published in: IEEE Transactions on Power Electronics ( Volume: 32 , Issue: 3 , March 2017 )
Page(s): 1779 - 1791
Date of Publication: 27 April 2016
Cite this:
B. Zhao, Q. Song, J. Li, Y. Wang and W. Liu, "Modular Multilevel High-Frequency-Link DC Transformer Based on Dual Active Phase-Shift Principle for Medium-Voltage DC Power Distribution Application," in IEEE Transactions on Power Electronics, vol. 32, no. 3, pp. 1779-1791, March 2017.