On the basis of analyzing the logical structure of cyber physical system for power grid(GCPS)

we proposed a modeling method of GCPS using the set theory. By studying the coupling principle of power flow and information flow

the GCPS was defined as the interconnection between the set of physical objects and the set of information objects. Then

the GCPS was decomposed into the power subsystem and load subsystem

which were described from the aspects of input

output

state changes and network structure. Under the constraints of the existing power grid network

subsystems were connected in accordance with rules from different perspectives to form the complete GCPS model. The case study of a typical power system shows the validity and significance of the proposed method.