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Title: A Line Impedance Conditioner for Saturation Mitigation of Zigzag Transformer in Hybrid AC/DC Transmission System Considering Line Unbalances

Hybrid ac/dc transmission extends the power transfer capacity of existing long ac lines closer to their thermal limit, by superposing the dc current onto three-phase 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 a cost-effective approach to compensate for the line unbalance and therefore avoid saturation. The topology and operation principle are presented. The two-level control strategy is described, which enables autonomous adaptive regulation without the need of system-level control. Design and implementation are also analyzed, including dc-link capacitance as one of the key line conditioner components, HLIC installation, and protection under fault conditions. The cost study on this HLIC-based hybrid system is also performed to reveal the benefits of the solution. In conclusion, simulation results and experimental results based on a down-scaled prototype are provided to verify the feasibility of the proposed approach.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Power Electronics
Additional Journal Information:
Journal Volume: 32; Journal Issue: 7; Journal ID: ISSN 0885-8993
Publisher:
IEEE
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; Hybrid ac/dc transmission; hybrid line impedance conditioner (HLIC); saturation; transmission line; unbalance; zigzag transformer
OSTI Identifier:
1394583

Liu, Bo, Shi, Xiaojie M., Li, Yalong, Wang, Fei Fred, and Tolbert, Leon M.. A Line Impedance Conditioner for Saturation Mitigation of Zigzag Transformer in Hybrid AC/DC Transmission System Considering Line Unbalances. United States: N. p., Web. doi:10.1109/TPEL.2016.2608864.
Liu, Bo, Shi, Xiaojie M., Li, Yalong, Wang, Fei Fred, & Tolbert, Leon M.. A Line Impedance Conditioner for Saturation Mitigation of Zigzag Transformer in Hybrid AC/DC Transmission System Considering Line Unbalances. United States. doi:10.1109/TPEL.2016.2608864.
Liu, Bo, Shi, Xiaojie M., Li, Yalong, Wang, Fei Fred, and Tolbert, Leon M.. 2016. "A Line Impedance Conditioner for Saturation Mitigation of Zigzag Transformer in Hybrid AC/DC Transmission System Considering Line Unbalances". United States. doi:10.1109/TPEL.2016.2608864. https://www.osti.gov/servlets/purl/1394583.
@article{osti_1394583,
title = {A Line Impedance Conditioner for Saturation Mitigation of Zigzag Transformer in Hybrid AC/DC Transmission System Considering Line Unbalances},
author = {Liu, Bo and Shi, Xiaojie M. and Li, Yalong and Wang, Fei Fred and Tolbert, Leon M.},
abstractNote = {Hybrid ac/dc transmission extends the power transfer capacity of existing long ac lines closer to their thermal limit, by superposing the dc current onto three-phase 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 a cost-effective approach to compensate for the line unbalance and therefore avoid saturation. The topology and operation principle are presented. The two-level control strategy is described, which enables autonomous adaptive regulation without the need of system-level control. Design and implementation are also analyzed, including dc-link capacitance as one of the key line conditioner components, HLIC installation, and protection under fault conditions. The cost study on this HLIC-based hybrid system is also performed to reveal the benefits of the solution. In conclusion, simulation results and experimental results based on a down-scaled prototype are provided to verify the feasibility of the proposed approach.},
doi = {10.1109/TPEL.2016.2608864},
journal = {IEEE Transactions on Power Electronics},
number = 7,
volume = 32,
place = {United States},
year = {2016},
month = {9}
}