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Active Mitigation of Induced Voltage on Buried Pipelines Open Access


Other title
active mitigation
induced voltage
Type of item
Degree grantor
University of Alberta
Author or creator
Yong, Hyunjung
Supervisor and department
Xu, Wilsun (Electrical and Computer Engineering)
Examining committee member and department
Dinavahi, Venkata (Electrical and Computer Engineering)
Kish, Greg (Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Energy Systems
Date accepted
Graduation date
2017-06:Spring 2017
Master of Science
Degree level
Buried pipelines that share a common corridor with nearby overhead AC power lines experience voltage induction. The induced voltages can cause personnel safety and pipeline corrosion problems. Industry has a requirement to reduce the induced voltages below an acceptable level. In view of the limitations of existing methods to reduce the induced voltages and contributions of power line harmonic currents to the voltage induction, this thesis proposes an active method that can neutralize the induced 60Hz and harmonic voltages in buried pipelines. The idea of the proposed mitigation method is to apply proper neutralizing voltage to the two terminals of the buried pipeline which is parallel to overhead AC power lines. A feedback control system is embedded in the active mitigation device to automatically adjust the generation of the neutralizing voltage. This thesis shows that, by applying two proper neutralizing voltage sources at the two terminals, the whole induced voltage along the parallel zone of the buried pipeline can be mitigated. Methods to estimate the voltage and power ratings of active sources are proposed. Solutions for dealing with some practical issues are also recommended. Simulation studies are conducted in this thesis to verify the proposed method and to determine the main factors affecting the active mitigation device and its design parameters. The method of the probe-wire-based field measurement is also investigated to help the design of the mitigation device.
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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