Following the previous paper in the series

this paper provides a review of existing research methods on the sub-topics of attack detection and defense strategy. The purposes and natures of research work of the sub-topics are concluded

and the deficiencies of existing researches are described considering the characteristics of cyber physical power system(CPPS). In terms of attack detection

some methods are proposed based on deviation and feature

which are implemented in cyber and physical sides in CPPS. In terms of protection

existing researches are concluded as the protection methods deployed on cyber side which are mainly reactive protection measures

and the protection methods deployed on physical sides which are mainly based on the ideas of redundant resources and corrective control. On the basis of existing research

the key techniques in CPPS cyber-attack detection and defense are drawn

and future research proposals in these fields are made in accordance with research perspective of modeling

in order to improve the real ability of CPPS to defend itself against cyber-attacks.