NDLI: A line impedance conditioner to improve zigzag transformer based hybrid Ac/Dc transmission under unbalanced line impedance conditions

Content Provider	IEEE Xplore Digital Library
Author	Bo Liu Xiaojie Shi Wang, F. Yalong Li
Copyright Year	2014
Description	Author affiliation: Dept. of Electr. Eng. & Comput. Sci., Univ. of Tennessee, Knoxville, TN, USA (Bo Liu; Xiaojie Shi; Wang, F.; Yalong Li)
Abstract	Hybrid ac/dc transmission extends the power transfer capacity of existing long ac lines closer to the thermal limit, by superposing dc current onto ac lines through a zigzag transformer. However, this transformer could suffer saturation under unbalanced line impedance conditions. This paper introduces the concept of hybrid line impedance conditioner (HLIC) as an approach to eliminate the line unbalance, which significantly reduces the design cost of the zigzag transformer and could be integrated into the transformer without requiring high voltage insulation. The topology and operation principle are presented, fully utilizing the capability of full bridge converters to generate a hybrid ac/dc voltage as an active impedance compensator. The selection criterion of the line conditioner key components, especially dc link capacitance is also proposed. Simulation and experimental results are provided.
Starting Page	736
Ending Page	743
File Size	2065583
Page Count	8
File Format	PDF
ISBN	9781479957767
DOI	10.1109/ECCE.2014.6953469
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resistance Power transmission lines Rectifiers Impedance Circuit faults Voltage control Power transformer insulation
Content Type	Text
Resource Type	Article

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