A novel method for locating power system out-of-step center on the basis of Oscillation Energy Flow

摘要

Splitting strategy is very important for the safety and stability of grids. However, splitting can hardly be appropriately performed without the location of out-of-step center. Considering conventional out-of-step oscillation criteria are short of capability for locating out-of-step center, this paper discusses out-of-step oscillation from the perspective of energy and proposes a novel method to effectively locate it. At first, energy structure is briefly introduced, from which OEF (Oscillation Energy Flow) is derived. Through the study on OEF variation rules between out-of-step subsystems, OES (Oscillation Energy Singularity) is discovered. As a distinct characteristic only on out-of-step oscillation center, OES offers new thoughts on the capture of out-of-step oscillation center: because OES is quite intuitive and easy to capture, we can capture the location of out-of-step center by finding the location of OES. At last, simulation on real power grids case proves its effectiveness.