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Impact of High Levels of Series Compensation on Line Distance Protection
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering.ORCID iD: 0000-0002-3463-7793
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering.ORCID iD: 0000-0003-0759-4406
2020 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Series compensation of transmission lines creates several challenges for distance protection, particularly at the high compensation levels that have recently become more common. In this paper, the effect of high levels of series compensation on distance protection is evaluated, using a PSCAD simulation model of a 500 kV, 200 km transmission line with a series capacitor bank. The capacitor bank model includes overvoltage protection using a metal oxide varistor (MOV) and bypass circuit breaker. Compensation levels of 70%, 100% and 140% are simulated and phase to ground faults are simulated at several positions along the line, with fault resistance of 0 Ω and 30 Ω and fault inception angle of 0 ° and 90 °. It is observed from the simulation results that traditional distance protection experiences severe challenges at high levels of series compensation. With increasing compensation level, an increased length of line experiences voltage inversion and current inversion during a fault. The fault trajectories in the R-X plane show that voltage and current inversion during a fault can cause directional problems and delay for the distance relay. Sub-synchronous oscillation (SSO) is observed for faults in series compensated lines, causing over-reach and under-reach problems as well as delayed relay operation.

Place, publisher, year, edition, pages
2020.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-271242OAI: oai:DiVA.org:kth-271242DiVA, id: diva2:1416254
Conference
The 15th International Conference on Developments in Power System Protection (DPSP), Liverpool, United Kingdom, 9 - 12 March 2020
Funder
SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, FPS12
Note

QC 20200602

Available from: 2020-03-23 Created: 2020-03-23 Last updated: 2020-06-02Bibliographically approved

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CiteExportLink to record
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Citation style
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