Understanding low frequency oscillation in power systems

This paper presents a complete overview of low frequency oscillation phenomena in power systems. Definition of low frequency oscillation and its classification is clearly explained. Some power system blackout incidents due to low frequency oscillation and the lesson learned from those incidents are given in the paper. Widely used methodology for studying low frequency oscillation among power utilities is also presented. Methods for oscillation damping, both at operational and planning stages of power system are briefly discussed. A comprehensive case study of low frequency oscillation in simple system is presented using eigenvalue analysis. Time domain results are presented to support the eigenvalue analysis. Conclusions are duly drawn