Amplitude based directional relaying scheme for UPFC compensated line during single pole tripping

• Published in: Electric power systems research Vol. 184; p. 106290
• Main Authors: Akter, Samima, Biswal, Sandeep, Rathore, Natwar Singh, Das, Priyanath, Abdelaziz, Almoataz Y.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2020; Elsevier Science Ltd
• Subjects: Amplitudes; Circuits; Compensated system; Computer simulation; Current transformer; Directional relaying; Electrical equipment; Electricity distribution; Fault diagnosis; Least square method; Power system fault; Relaying; Single pole tripping; Transmission lines; Compensated system; Current transformer; Single pole tripping; Directional relaying; Least square method; Power system fault
• ISSN: 0378-7796; 1873-2046
• DOI: 10.1016/j.epsr.2020.106290

•In this work, an amplitude directional discriminating (ADIS) factor is derived using superimposed current and voltage signals which is accumulated at relay location for correct discrimination of the fault direction during SPT in presence of UPFC.•The ability of the proposed technique has been tested and verified on two different power systems (such as single and double circuit systems) considering various power system situations.•The critical system scenarios such as low/high resistance fault, simultaneous SPT condition, CCVT subsidence transient, CT saturation, cross country fault, far end fault, and close in fault etc. have also been included in the study from which it has been seen that the proposed algorithm is giving reliable results as compared to some of the existing techniques from literatures. This work, introduces a directional relaying technique based on amplitude directional discriminating (ADIS) factor for UPFC compensated high-voltage transmission lines during faults in the presence of single-pole-tripping (SPT) condition. After computation of positive sequence superimposed components of voltage and current signals, ADIS has been calculated for accurate fault direction discrimination. The feasibility and practicability of the proposed technique have been realized by simulating the single-circuit and double-circuit system using EMTDC/PSCAD under different adverse power system conditions. Least square method (LSM) has been used to estimate the fundamental components. The performance of various existing angle based directional relaying methods have been analysed considering SPT, in presence of UPFC in the single-circuit/double-circuit power system network and have been compared with proposed amplitude-based technique. The graphical illustration and analytical comparison of ADIS with widely used angle based techniques clearly exhibit its consistency, robustness and accuracy in estimating the direction of fault during SPT.