Active H_∞ fault-tolerant control design and online optimal selection schemes of fault-tolerant controllers

This paper proposes an active H_∞ fault-tolerant control and optimal schemes for selecting a controller online, and constructs many-to-many mappings between fault modes and controllers under the "off-line design, online selection" fault-tolerant structure. According to the specific fault model, the active H_∞ fault-tolerant control is designed off-line for every recoverable fault mode. Then, three methods are presented to shrink all fault-tolerant mappings between fault modes and fault-tolerant controllers for different requirements. As a result, four selection schemes are proposed to choose a proper controller from a given set of controllers for a given fault mode. These four selections are designed for different requirements to improve the fault-tolerant performances of systems. Finally, a simulation is performed to illustrate and validate the effectiveness of the active H_∞ fault-tolerant controllers and the selection schemes.