On-line static security analysis method based on topological comparison

The invention provides an on-line static security analysis method based on topological comparison, and belongs to the technical field of computing of a power system. On the basis that the topological structure of a section is not changed, a factor table under a ground state section and inverse matrix information used in quick fault filtration for direct current tide are fully used; and under the condition that the topological structure of the section is changed, the factor table is corrected through partial topological analysis and a partial factor correction technology, and the on-line static security analysis method is provided on this basis. By the on-line static security analysis method, the static security analysis computing speed is increased; based on the change characteristic of the topological structure of an on-line system, on-line static security analysis is performed by fully using a measure combining topological comparison, process value reuse and partial topological analysis; the load rate of a computing server is reduced; and the scanning speed of the current section and a reusable section is increased.