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Open AccessArticle

A Unidirectional DC-DC Autotransformer for DC Grid Application

1
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
2
TBEA China Xinjiang Sunoasis Co., Ltd., Xi’an 710000, China
*
Author to whom correspondence should be addressed.
Energies 2018, 11(3), 530; https://doi.org/10.3390/en11030530
Received: 28 January 2018 / Revised: 9 February 2018 / Accepted: 23 February 2018 / Published: 1 March 2018
(This article belongs to the Section Electrical Power and Energy System)
Conventional unidirectional DC-DC converters for DC grid application employ DC-AC-DC two-stage conversion technology and suffer from high converter cost and power loss. To solve these issues, a unidirectional step-up DC-DC autotransformer (UUDAT) and a unidirectional step-down DC-DC autotransformer (DUDAT) are studied. The UUDAT and DUDAT are composed of a series connection of diode bridges and voltage source converters. Topologies of UUDAT and DUDAT are detailed. The harmonic and un-controllability issues are discussed. Control and possible application scenarios for UUDAT and DUDAT are depicted. DC fault isolation mechanism and the methods of dimensioning the voltage and power ratings of the components in UUDAT and DUDAT are studied. Extensive simulations on power system level and experiments on a UUDAT and DUDAT prototype verified their technical feasibility. View Full-Text
Keywords: DC-DC power conversion; DC power systems; DC power transmission; HVDC transmission; HVDC circuit breakers DC-DC power conversion; DC power systems; DC power transmission; HVDC transmission; HVDC circuit breakers
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Zhou, M.; Xiang, W.; Zuo, W.; Lin, W.; Wen, J. A Unidirectional DC-DC Autotransformer for DC Grid Application. Energies 2018, 11, 530.

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