A new online realization method of locating low frequency oscillation source in power grid based on PMU

To strengthen the monitoring and early warning of dangerous low frequency oscillation events, and then search and locate low frequency oscillation (LFO) propagation path and the starting points is the surest way to control the harm from LFO. Transient energy method based on energy concentration, transmission and dissipation principles is used to observe LFO and has become a new research and application hotpot for it. On the basis of wide area real-time data acquired by PMUs and transient energy theory, in this paper, a whole new set of method for online monitoring and source locating of LFO is proposed. This new method has been applied in an actual power grid of a province in China with 153 PMUs. With real-time data acquired by PMU, the method can calculate the distribution trends of disturbance energy and locate the outside interference points when there are strong disturbances in observation points in realtime. The effectiveness and availability of the method was verified.