Abstract
Power grid is one of the complex networks and is subjected to disturbances which manifest in the form of oscillations in system. The presence of unstable oscillations in the system sustained for a longer time period may disrupt the grid operation. Thus monitoring and detecting unstable oscillations is necessary for reliable, stable and secure operation of the system. Identifying the source of these oscillatory modes is also necessary in-order to damp them. This paper reports a case study of an event leading to loss of generation in the Northern Region of the Indian power grid and identifying the source of oscillations using measurement based methods. With the availability of synchrophasor measurements the ability to locate the source of the disturbance by performing modal analysis in real time will help the grid operator to take quicker actions for stable operation of power system.
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