The invention provides an apparatus for analyzing a power system comprising a first subsystem, a second subsystem and an interface line connecting the first subsystem and the second subsystem, the apparatus comprising: (Second subsystem model) of the second subsystem viewed from a first node, which is a connection point of a line, and a first subsystem for analyzing a first subsystem at each calculation interval using each node value of the first subsystem Subsystem analysis department; And a model of the first subsystem (first subsystem model) viewed from a second node which is a connection point of the second subsystem and the interface line, and a node of the second subsystem, And a second subsystem analyzer for analyzing the second subsystem for each of the plurality of subsystems.
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