Cyber-physical electrical energy systems (CPEES) combine computation

communication and control technologies with physical power system

and realize the efficient fusion of power

information and control. This paper summarizes and analyzes related critical scientific problems and technologies

which are needed to be addressed with the development of CPEES. Firstly

since the co-simulation is an effective method to investigate infrastructure interdependencies

the co-simulation platform establishment of CPEES and its evaluation is overviewed. Then

a critical problem of CPEES is the interaction between energy and information flow

especially the influence of failures happening in information communication technology (ICT) on power system. In order to figure it out

the interaction is analyzed and the current analysis methods are summarized. For the solution of power system control and protection in information network environment

this paper outlines different control principles and illustrates the concept of distributed coordination control. Moreover

mass data processing and cluster analysis

architecture of communication network

information transmission technology and security of CPEES are summarized and analyzed. By solving the above problems and technologies

the development of CPEES will be significantly promoted.