TY - JOUR
T1 - Current differential relay characteristic for bipolar HVDC transmission line fault detection
AU - Saber, Ahmed
AU - Zeineldin, Hatem
AU - El-Fouly, Tarek
AU - Al-Durra, Ahmed
N1 - Funding Information:
This work was supported by the Khalifa University of Science and Technology under Award No. CIRA-2019-049.
Publisher Copyright:
© 2020 The Institution of Engineering and Technology.
PY - 2020/12/4
Y1 - 2020/12/4
N2 - This study proposes a new differential relay characteristic to detect internal faults on bipolar HVDC (high voltage direct current) transmission lines and discriminate accurately and in a timely manner both internal and external faults. In comparison with the conventional differential protection characteristic, the proposed relay characteristic avoids the need for an intentional time delay typically required to avoid nuisance fault detection. The sampling currents of the positive and negative poles are obtained from both line ends, and the noise is eliminated from the current signals using a stationary wavelet transform. Initially, a startup unit is utilised to activate the proposed protection scheme. The proposed current differential scheme adopts a biasing technique, which is based on the inherent transient behaviour of the bipolar HVDC system during both external and internal faults. The HVDC transmission line is implemented on the PSCAD/EMTDC platform utilising the frequencydependent phase model, and it is tested considering numerous internal and external faults. Finally, the proposed current differential relay characteristic is tested considering different fault resistances up to 1000 Ω as well as different fault locations, including internal HVDC line faults and external faults at both rectifier and inverter sides. The obtained results confirm the robustness of the proposed protection scheme for bipolar HVDC transmission lines fault detection.
AB - This study proposes a new differential relay characteristic to detect internal faults on bipolar HVDC (high voltage direct current) transmission lines and discriminate accurately and in a timely manner both internal and external faults. In comparison with the conventional differential protection characteristic, the proposed relay characteristic avoids the need for an intentional time delay typically required to avoid nuisance fault detection. The sampling currents of the positive and negative poles are obtained from both line ends, and the noise is eliminated from the current signals using a stationary wavelet transform. Initially, a startup unit is utilised to activate the proposed protection scheme. The proposed current differential scheme adopts a biasing technique, which is based on the inherent transient behaviour of the bipolar HVDC system during both external and internal faults. The HVDC transmission line is implemented on the PSCAD/EMTDC platform utilising the frequencydependent phase model, and it is tested considering numerous internal and external faults. Finally, the proposed current differential relay characteristic is tested considering different fault resistances up to 1000 Ω as well as different fault locations, including internal HVDC line faults and external faults at both rectifier and inverter sides. The obtained results confirm the robustness of the proposed protection scheme for bipolar HVDC transmission lines fault detection.
UR - http://www.scopus.com/inward/record.url?scp=85095781126&partnerID=8YFLogxK
U2 - 10.1049/iet-gtd.2020.0556
DO - 10.1049/iet-gtd.2020.0556
M3 - Article
AN - SCOPUS:85095781126
SN - 1751-8687
VL - 14
SP - 5505
EP - 5513
JO - IET Generation, Transmission and Distribution
JF - IET Generation, Transmission and Distribution
IS - 23
ER -