Fault Tolerant Control Considering Actuator Saturation and External Disturbances

Khatibi, Mahmood | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 49678 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Haeri, Mohammad
  7. Abstract:
  8. A control system capable of tolerating system malfunctions while maintaining an acceptable level of performance is referred as fault tolerant control system. The constraints on the amplitude of input control signals limit the domain of attraction even for linear models. Ignoring this fact may lead to an unsatisfactory performance and even closed loop instability. Designing the controller such that the domain of attraction is maximized has been an attractive topic for researchers. On the other hand, persistent disturbances always play an essential role in the real word systems. Designing the controller in a way such that the effect of such disturbances is attenuated is another challenging issue. Unfortunately minimizing the effect of persistent disturbances results in a small domain of attraction and vice versa. It is an open and challenging issue which is considered in this thesis. In addition, new methods are presented which are applicable in both passive cases, where there is no estimation of fault, and active cases, where the fault is estimated. Also, an intermediate case, where the fault is not estimated precisely as active approaches but some typical information such as its rate is available, is investigated for the first time
  9. Keywords:
  10. Disturbance Rejection ; Fault-tolerant Control ; Attractive Domain ; Actuator Saturation

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