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Date of Award


Document Type

Master's report

Degree Name

Master of Science in Electrical Engineering (MS)

College, School or Department Name

Department of Electrical and Computer Engineering

First Advisor

Sumit Paudyal


Bruce Mork


Power Swing is a condition in power system after the disturbance, where system oscillates around its steady state operating point. Power swing leads to oscillations in voltage, current, and frequency in the system, which causes stress in the equipment and also impacts the operation of protection devices. Depending on the severity of disturbance and corrective actions initiated during the swing condition, system may or may not reach a new steady state condition. This has been observed from various blackout events and system failures in the past including the 2003 Northeast blackout. Detection of the power swing condition and prompt activation of appropriate corrective actions are vital part of power system protection. Present methods implemented to detect the power swing condition required extensive system stability study and are dependent on the system parameters which vary with the severity of disturbance and the system topology. This makes relay settings a challenging task to initiate appropriate correction in all possible swing scenarios. In this report, the problem of power swing detection is analyzed based on Swing Center Voltage (SCV) method. The SCV method is independent of system parameters such as impedance and rate of change of impedance, which vary during the power swing. Also, this scheme can be setup without extensive system stability study, which makes it easier to implement. In this project, the SCV method is implemented with measurements from modern synchrophasor technology in a Single Machine Infinite Bus system. The logic of SCV method is implemented through Real-Time Automation Controller (RTAC, SEL-3530) and the synchrophasor measurements are obtained through phasor measurement compatible relay SEL-421. Case studies with different power swing conditions have demonstrated successful results of SCV method for the power swing detection. Possibilities and difficulties in implementation of synchrophasor technology for SCV method are also discussed in the report.