Fault detection during power swing in thyristor-controlled series capacitor-compensated transmission lines

• Published in: Electric power systems research 2020-10, Vol.187, p.106481, Article 106481
• Main Authors: Alizadeh, Behzad Asle Mohammad, Khederzadeh, Mojtaba, Razzaghi, Reza
• Format: Article
• Language: English
• Subjects: Capacitors; Compensated transmission lines; Electric currents; Electric power lines; Fault detection; Fault diagnosis; IEEE standards; Mathematical morphology; Mathematical Morphology (MM); Power swing; Thyristor Controlled Series Capacitors (TCSC); Thyristors; Transmission lines
• ISSN: 0378-7796; 1873-2046
• DOI: 10.1016/j.epsr.2020.106481

•Challenges associated with the protection of power networks equipped with TCSCs are summarized.•The proposed fault detection method based on the Mathematical Morphology is introduced in detail.•It is shown that the proposed method provides high speed and accuracy for all types of faults.•It is shown that the proposed method is not sensitive to nonlinear changes of TCSC Fault detection during power swing in compensated transmission lines by Thyristor Controlled Series Capacitors (TCSCs) is a challenging problem and conventional detection methods might not be accurate. In this paper, a high speed fault detection approach based on Mathematical Morphology is proposed. The proposed method uses voltage and current signals for fault and swing detections, respectively. The performance of the proposed method is evaluated using two simulation case studies simulated in PSCAD/EMTDC: (i) a single machine infinite bus network and (ii) IEEE standard 9 bus three machine network. It is shown that the proposed approach is not sensitive to nonlinear behavior of TCSCs and it is capable of detecting all types of faults, including three-phase ones, during power swing accurately. In addition, due to low computational complexity, the proposed method provides significantly high detection speed.