Fault detection for discrete -time system based on observer using l_1 technique

摘要

A new type of linear discrete-time system fault detection and isolation (FDI) using l_1 robust observer is presented in this paper. In order to design an output observer which can detect and isolate fault precisely despite of the plant under uncertainty input or the mathematical model uncertainty. l_1 optimization of Robust Control Theory is used in the stage of residual generation. Recasting the problem of designing robust observer as l_1 optimization problem. To SISO system, a double-coprime factorization fo transfer function is used to create an observer, and using LP theory solute this question. using this observer the fault of control system can be detected prcisely despite of some uncertainty by computer aided experiment.