New energy station oscillation safety domain construction method and device based on polynomial fitting

The invention relates to the technical field of new energy stations, in particular to a polynomial fitting-based new energy station oscillation safety domain construction method and device. The method comprises the following steps: solving a function of oscillation damping of the new energy station in multiple oscillation modes about an operation condition according to acquired unit parameters and AC power grid parameters of the new energy station; obtaining a plurality of initial critical oscillation stable operation conditions according to the plurality of discrete points on the oscillation safety domain boundary, and fitting the initial critical oscillation stable operation conditions into an approximate analytical expression of the oscillation safety domain boundary; obtaining a predicted boundary point by using an approximate analytical expression, and obtaining a corrected boundary point with oscillation damping meeting certain convergence precision; and generating the oscillation security domain accord