The Principle and Criterion of An Oscillation Islanding Device of Yunnan Small Hydro Power Based on Wide-area Measurement

How to find the oscillation source,i.e.the cluster of units which as the main role involved in an oscillation,and quickly make the units disconnected is the key issue to deal with the oscillation problem of power grid.According to the oscillation characteristics of Yunnan Power System(YPS) and with the disconnection principles based on power oscillation amplitude and on PRONY analysis,this paper deduces a method to make judgment of the oscillation situation of YPS based on the electromechanical wave theory.With wide-area measurement the method can on-line determine which units are the oscillation source and how to disconnect them.The feasibility of the proposed method is verified with RTDS.