Pre-Energization Concept for Overhead Lines in MTDC Grids Using DCCB Internal Capacitor

The integration of overhead lines in future MTDC grids leads to a higher fault rate compared to cables. Most of the faults are considered to be non-permanent, so that the line can be reconnected after dielectric recovery. The auto-reclosing procedure in HVDC systems reveals new challenges since mult...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2022-02, Vol.37 (1), p.155-164
Main Authors: Torwelle, Pascal, Bertinato, Alberto, Grieshaber, Wolfgang, Yang, Yang, Raison, Bertrand, Le, Trung Dung, Petit, Marc
Format: Article
Language:English
Subjects:
Absorption
auto-reclosing
Cables
Capacitors
Circuit breakers
Circuit faults
DC circuit breaker (DCCB)
Electric power
Engineering Sciences
Fault property identification (FPI)
Flowcharts
hybrid lines
Identification methods
multi-terminal DC grid (MTDC)
overhead line (OHL)
Power lines
pre-energization
Resistors
Sensitivity analysis
Switches
Switchgear
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Summary:The integration of overhead lines in future MTDC grids leads to a higher fault rate compared to cables. Most of the faults are considered to be non-permanent, so that the line can be reconnected after dielectric recovery. The auto-reclosing procedure in HVDC systems reveals new challenges since multiple restrikes are possible within a short period of time. This paper proposes an auxiliary circuit for DC Circuit Breakers (DCCB) which enables to use the DCCB internal capacitor for the line pre-energization. A comprehensive description of the switchgear operations during the pre-energization sequence is provided and the fault property identification method is defined. The method is validated by simulations in a MTDC grid and a sensitivity analysis is carried out using EMTP-RV.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2021.3054599