Research on Dynamic Migration Mechanism of Out-of-step Oscillation Center Based on Wide Area Measurement

For the sake of the existing traditional out-of-step detection criterions´ defects caused by the lack of oscillation central location and direction of migration which cannot characterize the dynamic process of the oscillation center, on the basis of the wide-area measurement information of the migration of out-of-step oscillation center in the equivalent two-generators system, the paper proposes the dynamic analytic functions for multi-machine system, and then describes the trajectory of the out-of-step oscillation center in the migration of the tie line from the point of view of dynamic analysis, to study the dynamic migration mechanism of out-of-step oscillation center. The new England 39-node system simulation examples show that the method can effectively characterize the dynamic process of migration of oscillation center on the cut set, provide a new thought of out-of-step splitting criterion.