Real Time Power Swing Monitoring in a Hydro Power Plant Supported by Synchronized Measurements

Preliminary notes Dynamic disturbances in the electric power system exert influence on the operation of generators and cause several other disturbances, such as a power swing, resulting in the activation of protections, the stalling of generators and their disconnection from the grid. The application of synchronized measurements in the field of power swing has mainly been focused on a transmission power system and on the loss of synchronism on power lines. In this paper the original solution for real time power swing monitoring in a hydro power plant based on synchronized phasor measurements and Prony analysis is proposed, which is a basis for mitigation of disturbances. Prony analysis is used for the analysis of frequency, decreasing or increasing amplitude of oscillations based on the synchronized measurements of voltage phasors. Using the synchronized phasors measurements for power swing monitoring allows detection and monitoring of power swings in real time, which was not possible with classical methods. To conclude with, the results of the implemented real time monitoring system in the real hydro power plant are given in the paper.