Transient Stability Prediction for Real-Time Operation by Monitoring the Relative Angle with Predefined Thresholds

A. F. Diaz-Alzate, John E. Candelo-Becerra and Juan F. Villa Sierra
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A. F. Diaz-Alzate: Applied Technologies Research Group GITA, Universidad Nacional de Colombia, Sede Medellín 050041, Colombia
John E. Candelo-Becerra: Department of Electrical Energy and Automation, Universidad Nacional de Colombia, Sede Medellín 050041, Colombia
Juan F. Villa Sierra: National Control Center, XM, Operator of the Colombian Power System, Medellín 050022, Colombia

Energies, 2019, vol. 12, issue 5, 1-17

Abstract: Under real-time operation, early detection of oscillations that lead to instability is of noteworthy importance for power system operators. This paper demonstrates how the relative angle (RA) obtained with online data from phasor measurement units (PMUs) and predefined thresholds of the relative angle (PTRA) obtained with offline simulations are valuable for the monitoring and prediction of transient stability. Primary features of the method consist of first calculating the maximum and minimum relative angles by offline simulations of different contingencies. Next, the voltage angles at buses that represent areas of the power system are measured to calculate the center of inertia (COI). Finally, the RA of the generators at each area is determined during the online operation to monitor stability behaviors and identify those that lead to a loss of synchronism. The method was validated in the New England 39-bus and the IEEE 118-bus power systems by performing contingencies, finding critical stability angles, monitoring areas and controlling the predicted unstable events with control actions, such as generation and load tripping, with enough time to return to stability.

Keywords: transient stability; center of inertia; inertia; relative angle; phasor measurement units (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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