Advanced

Electromagnetic dispersion modeling and measurements for HVDC power cables

Nordebo, Sven LU ; Nilsson, Börje; Biro, Thomas; Cinar, Gökhan; Gustafsson, Mats LU ; Gustafsson, Stefan; Karlsson, Anders LU and Sjöberg, Mats (2011) In Technical Report LUTEDX/(TEAT-7211)/1-32/(2011) TEAT-7211.
Abstract
This paper provides a general framework for electromagnetic modeling, computation and measurements regarding the wave propagation characteristics of High-Voltage Direct Current (HVDC) power cables. The modeling is focused on very long (10 km or more) HVDC power cables and the relevant frequency range is therefore in the low-frequency regime of about 0-100 kHz.

An exact dispersion relation is formulated together with a discussion on practical aspects regarding the computation of the propagation constant and the related characteristic impedance. Experimental time-domain measurement data from an 80 km long HVDC power cable is used to validate the model.

It is concluded that a single-mode transmission line model is not... (More)
This paper provides a general framework for electromagnetic modeling, computation and measurements regarding the wave propagation characteristics of High-Voltage Direct Current (HVDC) power cables. The modeling is focused on very long (10 km or more) HVDC power cables and the relevant frequency range is therefore in the low-frequency regime of about 0-100 kHz.

An exact dispersion relation is formulated together with a discussion on practical aspects regarding the computation of the propagation constant and the related characteristic impedance. Experimental time-domain measurement data from an 80 km long HVDC power cable is used to validate the model.

It is concluded that a single-mode transmission line model is not adequate to account for the mismatch between the power cable and the instrumentation.

A mismatch calibration procedure is therefore devised to account for the connection between the measurement equipment and the cable. A dispersion model is thus obtained that is accurate for early times of pulse arrival.

To highlight the potential of accurate electromagnetic modeling, an example of high-resolution length-estimation is discussed and analyzed using statistical methods based on the Cramer-Rao lower bound. The analysis reveals that the estimation accuracy based on the present model (and its related model error) is in the order of 100 m for an 80 km long power cable, and that the potential accuracy using a perfect model based on the given measurement data is in the order of centimeters. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Book/Report
publication status
published
subject
in
Technical Report LUTEDX/(TEAT-7211)/1-32/(2011)
volume
TEAT-7211
pages
32 pages
publisher
[Publisher information missing]
language
English
LU publication?
yes
id
fa5767a5-5817-48c5-8ebd-13e29e6829ad (old id 2202385)
date added to LUP
2011-11-04 12:30:08
date last changed
2016-08-30 11:49:26
@techreport{fa5767a5-5817-48c5-8ebd-13e29e6829ad,
  abstract     = {This paper provides a general framework for electromagnetic modeling, computation and measurements regarding the wave propagation characteristics of High-Voltage Direct Current (HVDC) power cables. The modeling is focused on very long (10 km or more) HVDC power cables and the relevant frequency range is therefore in the low-frequency regime of about 0-100 kHz. <br/><br>
An exact dispersion relation is formulated together with a discussion on practical aspects regarding the computation of the propagation constant and the related characteristic impedance. Experimental time-domain measurement data from an 80 km long HVDC power cable is used to validate the model.<br/><br>
It is concluded that a single-mode transmission line model is not adequate to account for the mismatch between the power cable and the instrumentation.<br/><br>
A mismatch calibration procedure is therefore devised to account for the connection between the measurement equipment and the cable. A dispersion model is thus obtained that is accurate for early times of pulse arrival.<br/><br>
To highlight the potential of accurate electromagnetic modeling, an example of high-resolution length-estimation is discussed and analyzed using statistical methods based on the Cramer-Rao lower bound. The analysis reveals that the estimation accuracy based on the present model (and its related model error) is in the order of 100 m for an 80 km long power cable, and that the potential accuracy using a perfect model based on the given measurement data is in the order of centimeters.},
  author       = {Nordebo, Sven and Nilsson, Börje and Biro, Thomas and Cinar, Gökhan and Gustafsson, Mats and Gustafsson, Stefan and Karlsson, Anders and Sjöberg, Mats},
  institution  = {[Publisher information missing]},
  language     = {eng},
  pages        = {32},
  series       = {Technical Report LUTEDX/(TEAT-7211)/1-32/(2011)},
  title        = {Electromagnetic dispersion modeling and measurements for HVDC power cables},
  volume       = {TEAT-7211},
  year         = {2011},
}