Abstract
In this paper, two active fault-tolerant control (AFTC) structures are proposed for multiplicative and additive actuator faults respectively. Considering that the traditional generalized internal model control (GIMC) changes the dynamic input-output relationship of the original system, more exact fault information is employed to design the robustification controller of GIMC with the help of fault diagnosis observers. Further, a feedforward compensation unit and a feedback compensation unit are respectively designed for multiplicative and additive faults, striving to approximately recover the system performance to the normal one. Finally, an air handling unit (AHU) system is provided to verify the effectiveness and superiority of the proposed structures.
Highlights
Due to the increasing complexity, modern control systems are more and more vulnerable to faults and malfunctions
Fault tolerant control (FTC) technique provides an effective way to deal with faults, and attracts much attention from both industry and academia
FTC can be classified into two categories: passive FTC (PFTC) and active FTC (AFTC)
Summary
Due to the increasing complexity, modern control systems are more and more vulnerable to faults and malfunctions. It is important to point out that the GIMC structure can retain the internal stability of the system, the dynamic input-output relationship of the overall system has been changed since the input signal enters into the system from a different location [9], which no doubt influences the system performance This important issue was not taken into account in above works [12]–[15], which may be due to the absence of exact fault information. Two AFTC structures are respectively proposed for multiplicative and additive actuator faults by combing GIMC and fault compensation techniques, which can guarantee the stability of system and recover the system performance.
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