Distributed Cooperative Scheme for Forced Oscillation Location Identification in Power Systems

The most effective countermeasure against forced oscillations (FOs) is to locate and isolate external disturbances from power systems. However, it is challenging for existing location identification schemes to satisfy real-time computation and communication requirements in central data concentrators. To solve this problem, we propose a distributed cooperative scheme for identifying the FO source location. Phasor data collectors (PDCs) located at local control centers are utilized to calculate local energy flows embedded in low FOs. We apply an average-consensus algorithm for exchanging the energy flow information among local PDCs which detects the cut-set energy and locate the FO source in a distributed manner. We also propose an adaptive minimum cut-set division method based on graph theory. By implementing the proposed method on central PDC, the auxiliary control data are updated automatically, which makes the location scheme adaptive to changes in grid and communication network topologies. The effectiveness of the distributed cooperative location identification scheme is verified using the results for the IEEE 39-bus and 162-bus power systems.