Harmonics in MVDC cable systems : study on thermal and electric stress
Ratheiser, Patrik and Shahtaj, Shahtaj and Schichler, Uwe and Stewart, Brian G.; (2024) Harmonics in MVDC cable systems : study on thermal and electric stress. In: 23rd International Symposium on High Voltage Engineering (ISH 2023). IET, GBR, pp. 43-49. ISBN 978-1-83953-992-3 (https://doi.org/10.1049/icp.2024.0425)
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Abstract
MVDC can assist in resolving issues with the transition to renewable energy by expanding transmission capacity. Due to the use of converters, MVDC systems may be affected by harmonic currents and voltages. However, harmonics are not currently considered harmful in MVDC systems. Nevertheless, harmonics may have an impact on the electric field distribution and temperature in cable systems. Therefore, multiphysics FEM simulations are carried out to examine the general impact of harmonics in MVDC cables. The MVDC cable system experiences an electric field enhancement because of the influence of harmonics. The field enhancement shows the highest impact closest to the conductor. Furthermore, the average relative field enhancement is equal to the relative amplitudes of the harmonics. To investigate the field enhancement for different insulation material properties, different types of XLPE material (AC and DC) are investigated. Findings show that the influence of harmonic voltages rises with the non-linear conductivity of the insulation material. To examine the impact of harmonic currents on the ampacity of MVDC cable systems, FEM simulations are presented. The dielectric losses of MVDC cables compared to conductor losses are smaller than 0.01% and therefore negligible. Harmonic currents cause a very slight reduction in ampacity.
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Item type: Book Section ID code: 90605 Dates: DateEvent21 June 2024Published24 June 2023AcceptedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Pure Administrator Date deposited: 18 Sep 2024 15:23 Last modified: 13 Oct 2024 00:21 URI: https://strathprints.strath.ac.uk/id/eprint/90605