Signal Envelope-Based Adaptive Power Swing Blocking

Abstract

This research paper proposes detection of faults during power swings by using a peak envelope-based method to prevent incorrect distance relay operation. Distance relays should not operate during power swings except to remove a correctly detected fault event. In this study, distinction between faults and power swings is achieved by correctly observing fault occurrence based on dynamic thresholds generated by peak envelopes. The method utilizes a DC offset current in determining the fault inception and fifth harmonic voltage to assess the fault clearance. If the current surpasses the calculated threshold due to fault existence, the relay is allowed to operate. Re-blocking the relay after fault clearance is achieved in the case of a higher value of the voltage than the threshold value. Current and voltage data obtained from two different test systems simulated in PSCAD for various scenarios have been used in the proposed algorithm developed in MATLAB. In order to show the effectiveness of the proposed method, the results on the second test system have also been compared to the results of selected methods in the literature. It has been perceived that the developed method has a high accuracy and provides an appropriate time range for relay and breaker operation.

Keywords:

• distance protection relays
• DC offset current
• signal envelope
• power swing blocking
• fifth harmonic voltage
• transmission lines

ACKNOWLEDGMENT

There is no acknowledgement applicable in this work.

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author(s).

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author, upon reasonable request.

Additional information

Funding

No funding is involved in this work.

Notes on contributors

Alkım Çapar

Alkım Çapar was born in Balıkesir, Turkey, on June 1988. He received his BSc degree from Department of Electrical Engineering, Kocaeli University, Turkey, in 2012, and MS degree from the Department of Electrical Engineering, Kocaeli University in 2015.

Ayşen Basa Arsoy

Ayşen Basa Arsoy received her BSc degree from Istanbul Technical University, Turkey, in 1992, MS degree from the University of Missouri-Rolla in 1996, and PhD degree from Virginia Polytechnic Institute and State University in 2000, all in electrical engineering. She is currently a Professor at Kocaeli University. Her research interests include power system modeling and analysis, power system protection, distributed generation, energy storage and power electronics applications in power system.