Influence of partial undergrounding on the transient stability of EHV power transmission systems

Journal article (2016)

Authors

H. Khalilnezhad Intelligent Electrical Power Grids - EEMCS
M. Popov Intelligent Electrical Power Grids - EEMCS
JA Bos TenneT TSO B.V.
KPJ Jansen TenneT TSO B.V.
Research Group
Intelligent Electrical Power Grids (EEMCS) (TU Delft)
EHV cables Transient stability Cable length Shunt compensation Mixed OHL–cable connection Flexible switching
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Published Date

2016-2

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

Intelligent Electrical Power Grids

Abstract

This paper investigates the transient stability issues that may occur when long underground cables are added to EHV transmission systems. Dynamic behaviour of generators and terminal voltages with respect to various disturbances like cable disconnection/connection and fault currents are studied. Simulations are performed for the 2020 model of the Dutch transmission grid. The effects of partial undergrounding in two case studies with the total transmission length of 280 km are investigated. This work proposes criteria for accurate sizing of cable shunt compensation for dynamic simulation purposes based on grid voltages, generator reactive powers and power exchange with neighbouring grids. Moreover, a comparison between the dynamic behaviour of system variables for three different shunt compensation arrangements including line-end compensation, line-end middle compensation, and cable-end compensation is performed. Finally, a specific switching sequence for line disconnection/connection to improve voltage profiles and generator behaviours is introduced. The simulations are performed in PSS®E environment.