Characteristics of new energy system out-of-step and migration law of oscillation center

Aiming at the lack of research on the migration mechanism of the out-of-step oscillation centre of the power system under the scenario of high proportion of new energy grid-connected, the impedance characteristics of grid-connected wind turbine as an entry point, in-depth study of the migration mechanism of the out-of-step oscillation centre. By equating the DFIG wind turbine as a dynamically changing negative conductance and equating the PMSG wind turbine as a dynamically changing negative impedance, the rule of change of the oscillation centre distribution of the new energy grid-connected system under the multi-frequency oscillation scenario is derived, and the correctness of the theoretical analysis is verified by the simulation of the IEEE 39-node system.