With the help of advanced information technology

real-time monitoring and control levels of cyber-physical distribution systems (CPDS) have been significantly improved. However due to the deep integration of cyber and physical systems

attackers could still threaten the stable operation of CPDS by launching cyber-attacks

such as denial-of-service (DoS) attacks. Thus

it is necessary to study the CPDS risk assessment and defense resource allocation methods under DoS attacks. This paper analyzes the impact of DoS attacks on the physical system based on the CPDS fault self-healing control. Then

considering attacker and defender strategies and attack damage

a CPDS risk assessment framework is established. Furthermore

risk assessment and defense resource allocation methods

based on the Stackelberg dynamic game model

are proposed under conditions in which the cyber and physical systems are launched simultaneously. Finally

a simulation based on an actual CPDS is performed

and the calculation results verify the effectiveness of the algorithm.