Observer-based residual generation for nonlinear discrete-time systems

Estonian Academy of Sciences. Proceedings

Arvo Kaldmäe¹ 

关键词: nonlinear control;    fault detection;    residual generation;    observability;    algebraic methods;   

DOI  :  10.3176/proc.2018.4.01

学科分类：化学（综合）

来源: Teaduste Akadeemia Kirjastus

【 摘 要 】

The paper studies the possibility of constructing observer-based residuals to detect faults in a nonlinear discrete-timesystem. The residuals are generated in such a manner that they detect one specific fault and are not affected by other faults anddisturbances. Thus, a bank of residuals has been found to detect and isolate different faults in the system. An algebraic methodcalled functions’ algebra is used to construct an algorithm which computes the residuals. The key fact in residual generation is thatany discrete-time observable system can be taken into the extended observer form. This form is used to construct the observer toestimate the system states under the assumption that there are no faults in the system. The state estimates are then compared to themeasured values of the states. An example is added to illustrate the theoretical results. In the example it is also demonstrated howto combine the fault detection with the plant reconfiguration step of fault tolerant control.

【 授权许可】

CC BY-NC