Chair of Electromagnetic Theory

Modeling and EQS Simulations of DC High-Voltage Components With Space Charge and Thermodynamic Effects

Project title (German)
Modellierung und elektro-quasistatische Simulationen von DC-Hochspannungskomponenten mit Raumladungs- und thermodynamischen Effekten

Project manager
Prof. Dr. rer. nat. Markus Clemens
(Chair of Electromagnetic Theory)

Project member
Christoph Jörgens, M. Sc.

Project duration
2019 - 2022

electro-quasi-static fields, electric power transmission, high-voltage direct current cable, nonlinear organic materials, space charges, charge injection, charge movement

Deutschen Forschungsgemeinschaft (DFG) under grant number CL143/17-1

Project description

The shift towards decentralized renewable energy sources in the context of the energy transition is related to the planned expansion of electric power grids through underground cables for High-Voltage Direct Current (HVDC) transmission.

Modern HVDC underground cables and their connection components contain polymeric insulating materials with excellent insulating properties, but with the disadvantage of forming electrical space charges. These charges act as sources of electric fields and can -- in extreme cases -- cause an exceeding of the electric breakdown field strength in the insulating materials. The resulting damage to the insulating material can lead to a short circuit and thus to a cost-intensive outage of the affected power cable. In order to prevent potential damage and thus ensure the reliability of the equipment, a detailed knowledge of the electric field distribution is necessary. This can be determined using numerical simulation methods. The simulation of the electric field distribution in a power cable can be considered as an electro-quasistatic problem, since it may take days or weeks for a time-constant space charge distribution to form in the insulating material.

In this research project, the physical fundamentals of the behavior of such electrical charge distributions in insulating materials of HVDC underground cables are investigated. From this, improved high-resolution three-dimensional computer simulation models shall be developed to calculate the electrical and thermal behavior of HVDC cable systems in a near-real environment and optimize them by using novel electric field-controlling insulation materials.

Project-related publications

C. Jörgens and M. Clemens, "A Review about the Modeling and Simulation of the Electro-Quasistatic Fields in HVDC Cable Systems", Energies (Special Issue „Design and Testing of Power Cable System”), vol. 13, no. 19, pp. 5189, Oct. 2020.
C. Jörgens and M. Clemens, "A Conductivity-Based Model for the Simulation of Homo- and Heterocharges in XLPE HVDC Cable Insulation", IET Science, Measurement and Technology, vol. 13, no. 7, pp. 975-983, Oct. 2019.
C. Jörgens, F. Kasolis and M. Clemens, "Numerical Simulations of Temperature Stability Limits in High-Voltage Direct Current Cable Insulations", IEEE Transactions on Magnetics, vol. 55, no. 6, June 2019, vol. 55, no. 6, Jun. 2019. IEEE.
C. Jörgens and M. Clemens, "Empirical Conductivity Equation for the Simulation of Space Charges in Polymeric HVDC Cable Insulations", 2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE 2018), 10.-13.09.2018, Athens, Greece, 2018.
C. Jörgens and M. Clemens, "Thermal breakdown in high voltage direct current cable insulations due to space charges", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 37, no. 5, pp. 1689-1697, 2018. Emerald Publishing Limited.
C. Jörgens and M. Clemens, "Modelling the Electric Field in Polymeric Insulation Including Nonlinear Effects due to Temperature and Space Charge Distributions", 2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIPD 2017), Fort Worth, TX, USA, 22.-25.10.2017, 2017, 2017.

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