With the wide application of information and communication technology in power system

the traditional power grid is transformed from only analyzing the physical system or the information space itself to the cyber-physical power system (CPPS) under the new power system. Based on the complex network theory

an identification method of key power and information nodes is proposed through simulating the interaction between energy flow and information flow under cascading failures. Firstly

the interdependent network model of CPPS primary and secondary systems is constructed in accordance with the coupling relationship between energy flow and information flow in CPPS with combination of the evolution process of cascading failures between power flow and information network delay changes. Then

on this basis

the key node indexes of power network and information network are set up and the key cyber-physical important nodes are identified. Finally

the effectiveness of the model and method is tested by an example simulation method to determine the feasibility of the method in practice.