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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 46173 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Nobakhti, Amin
- Abstract:
- Design of fault tolerant controllers with a reliable and robust control structure that can accommodate sensor and actuator failure is a challenging problem. In the process control literature, the term “integrity” is used to characterize these properties for decentralized control systems. It refers to the ability to retain system stability when one or some of the control loops get in or out of service or when loop gains are detuned.Conditions pertaining to the integrity of the closed-loop system are described by a series of successively more difficult to attain criteria whose evaluation is only based on the process steady state gains. These are Integral stabilizibility (IS), Integral Controllability (IC), Integral Controllability with Integrity (ICI) and Decentralized Integral Controllability (DIC). These only govern the existence or lack thereof a controller and cannot be used to determine the said controller gains.In this thesis we consider tuning of decentralized PID controllers with integrity. As mentioned the integrity conditions for decentralized controller only existence criteria. They only determine if a controller exists to achieve the specific integrity criteria, but cannot be used to actually determine the parameters of the controller itself. By modelling the loop gain as an uncertainty parameter, previously developed tool in analysis of system with parametric uncertainty are used to derive bounds for the controller loop gains. The approach is then extended such that independent gain ranges for each parameters of the controller are derived. The calculations are presented for all four integrity conditions referred to above. The proposed approach is applied on a verity of examples and verified by simulation case studies
- Keywords:
- Integration ; Stability Region ; Integral Controllability ; Decentralized Controller ; Decentralized Integral Controller ; Loop Gain ; Unconditional Stability
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