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Fast branch current control of mesh connected DC grids using supplemental converter terminal controls

Author: Babak Malek; Brian K Johnson
Publisher: 2013.
Dissertation: Ph. D., Electrical Engineering University of Idaho August 2013
Edition/Format:   Thesis/dissertation : Thesis/dissertation : Manuscript   Archival Material : EnglishView all editions and formats
Summary:
The challenges of transferring large levels of renewable generation output from remote locations to load centers through congested AC transmission networks has renewed interest in high voltage direct current (HVDC) transmission. Mesh connected HVDC grids are under consideration to maximize utilization of available transmission corridors. The branch current flows in a conventional HVDC grid are determined by voltage  Read more...
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Details

Genre/Form: Academic theses
Additional Physical Format: Electronic reproduction:
Malek, Babak.
Fast branch current control of mesh connected DC grids using supplemental converter terminal controls.
[Moscow, Idaho] : University of Idaho, 2013
(OCoLC)865478004
Material Type: Thesis/dissertation, Manuscript
Document Type: Book, Archival Material
All Authors / Contributors: Babak Malek; Brian K Johnson
OCLC Number: 862821332
Notes: Major professor: Brian K. Johnson.
Description: xv, 84 leaves : illustrations (some color) ; 29 cm
Responsibility: by Babak Malek.
More information:

Abstract:

The challenges of transferring large levels of renewable generation output from remote locations to load centers through congested AC transmission networks has renewed interest in high voltage direct current (HVDC) transmission. Mesh connected HVDC grids are under consideration to maximize utilization of available transmission corridors. The branch current flows in a conventional HVDC grid are determined by voltage differences between the ends of a line, making it difficult to regulate currents in different paths. But if the DC grid is mathematically controllable it is possible to design a control scheme to control the currents in individual branches of the mesh and even bring them to zero in case of a fault. In addition High Temperature Superconducting (HTS) cables are candidates for future implementations of future DC grids with their high current capabilities and low losses. Branch current control becomes even more difficult in a superconducting grid where the steady-state voltage is equal across the system, and line current flows only change during temporary voltage differences. For example, a de-energized line that is energized will not carry any load current until a voltage difference occurs across it. This document will explore options to control individual branch currents on both conventional and HTS mesh connected DC systems by exploring controllable circuit configurations such that converter controls are capable of controlling individual branch currents without the need to add series elements. A control scheme will be discussed and implemented in computer simulation for a DC grid with a controllable configuration for grids based on line current commutated current source converters and grids based on voltage sourced converters. The scheme will also be applied to grids using normal conductors and grids using superconducting dc cables.

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