Distributed Fault Diagnosis Approach for Large-Scale Interconnected Systems with Communication Link Failures

This paper considers the problem of distributed fault diagnosis of interconnected systems with communication link failures. The state coupling between subsystems brings great challenges to the design of fault diagnosis observers. In the distributed design scheme, it is usually necessary to transmit information between subsystem observers. Once any communication link failures, all fault diagnosis observers will not work. To solve this problem, two distributed algorithms based on average consensus are used for the design of distributed fault diagnosis observer respectively. In the case that the communication topology graph is a strongly connected graph, the proposed distributed algorithm can still achieve accurate diagnosis of the fault of the system. Finally, the three-tank system and the power network system are used to verify the feasibility and effectiveness of the proposed distributed design method.