Research on Overvoltage for XLPE Cable in a Modular Multilevel Converter HVDC Transmission System

Due to the rapid development of the voltage-source converter (VSC), the demands for HVDC cables have increased significantly. Although more than ten VSC-HVDC projects are under construction and many more are in operations globally, the testing criteria for HVDC XLPE cables are mainly referenced to t...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2016-04, Vol.31 (2), p.683-692
Main Authors: Haitian Wang, Junzheng Cao, Zhiyuan He, Jie Yang, Zhengyi Han, Chen, George
Format: Article
Language:English
Subjects:
Cable insulation
Cables
Circuit faults
Converters
DC cable
Electric power transmission
HVDC
HVDC transmission
Impulses
Inductors
Modular
modular multilevel converter (MMC)
Overvoltage
Power conversion
Stresses
Switching
switching impulse overvoltage
Voltage control
voltage-source converter (VSC)
XLPE
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Summary:Due to the rapid development of the voltage-source converter (VSC), the demands for HVDC cables have increased significantly. Although more than ten VSC-HVDC projects are under construction and many more are in operations globally, the testing criteria for HVDC XLPE cables are mainly referenced to test guideline TB 496 recommended by CIGRE. Due to the large stray capacitance of the VSC-HVDC cables, the switching impulse overvoltage stress of the cables is the main electrical parameter concerned, a unified overvoltage factor of 2.1 p.u. being generally accepted. However, the switching impulse overvoltage stress of a VSC-HVDC cable system depends on not only the VSC topology but also the cable parameters and the volt-ampere characteristics of the dc cable surge arresters used. This paper studies the switching impulse overvoltage stresses for the dc cable system of a symmetrical monopole VSC-HVDC transmission system using the modular multilevel converter technology. The studies were performed according to the key technical parameters for a typical 1000-MW/320-kV VSC-HVDC transmission scheme, the XLPE dc cable links being assumed. The results show that a switching impulse overvoltage level of 2.3 p.u. should be applied during the type test of the overvoltage capability of the HVDC cables.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2015.2469595