Research on Index System Construction and Assessment Methods of Distribution Network CPS Security Against Cyber Attack

Abstract

With development of power distribution automation systems, the distribution network has gradually evolved into a highly coupled distribution network CPS system with information physics. Certain security risks to the distribution network CPS have been brought to the distribution network CPS system when the information system supports the stable operation of the physical system. Such as the presence of a cyber-attack and other methods attack the information system. It may lead the failure of power services or functions, and affect the safe and stable operation of the distribution network CPS in turn. The security definition and security analysis objectives of the distribution network CPS are given in this paper firstly. Then the information security indicators and physical security indicators of the distribution network CPS are constructed. The information physical indicators are integrated and expanded from the perspective of security risk. And information security index and physical security index are constructed, also cyber physical indicators are integrated and expanded from the perspective of security risks. The causal interaction logic of the cyber-attack on the distribution network CPS is analyzed. The cyber-attack is classified according to the impact of the cyber-attack on the distribution network CPS. The impact of the distribution network system under the cyber-attack is deeply analyzed. Finally considering the combination of expected failures, a security assessment process of distribution network under the action of cyber-attack is proposed and verified in the calculation example.