The invention belongs to the field of
power grid intensity quantification, and discloses an
energy storage heterogeneous multi-
machine system intensity quantification method,
system and device and a medium, and the method comprises the steps: carrying out the eigenvalue
decomposition of an extended
admittance matrix, obtaining a generalized short-circuit ratio and a corresponding eigenvector, and calculating a participation factor of the device based on the eigenvector; according to a multivariable
feedback control theory, constructing a dynamic model of equipment in an equivalent isomorphic
system, identifying a weakest subsystem
characteristic equation, and calculating a critical short-circuit ratio of equivalent equipment in a heterogeneous system; and calculating a relative difference value between the generalized short-circuit ratio and the critical short-circuit ratio so as to quantify the small disturbance
stability margin of the
energy storage heterogeneous system. According to the method, the extended
admittance matrix is subjected to eigenvalue
decomposition, so that the generalized short-circuit ratio and the eigenvector corresponding to the generalized short-circuit ratio can be extracted, the dynamic characteristics of the
energy storage heterogeneous multi-
machine system are deeply analyzed, the participation factor of each device is calculated by using the obtained eigenvector, and the specific contribution degree of each device in the dynamic behavior of the system is accurately quantified.