| Summary: | 碩士 === 國立高雄應用科技大學 === 電子工程系 === 105 === In an attempt to challenge Proportional-Integral-Derivative (PID) method, Active
Disturbance Rejection Control (ADRC) was born to overcome disadvantages of the PID.
This thesis firstly focuses on the linear form of ADRC (LADRC) to compare with PID
manner. The design of both methods for a boiler-turbine unit is given. Simulation results
show improvements of the LADRC as eliminating noise powerfully, providing output
signal within lower overshoot and shorter settling time when compared with PID
method. Besides, the designing process of controllers declares that an object model with
full information is not necessary to compute LADRC controller.
Despite overcoming the conventional PID approach, LADRC also has unavoidable
disadvantages, so increasing capability of LADRC in strict applications is an obligatory
requirement. Based on fuzzy logic, the theory of Fuzzy – Linear Active Disturbance
Rejection Control (FLADRC) for the nth-order system is introduced in this study.
Because of saving good characteristics of LADRC and fuzzy, FLADRC approach is
obviously improved when compared with LADRC method. The comparison is
implemented in forms of first and second-order system.
In order to show abilities of the proposed approach (FLADRC), two practical
utilizations are presented in this thesis. Used objects are a boiler-turbine unit and an
artificial pancreas system. FLADRC controllers not only reveal new functions in
controlling but also overcomes previous controllers. Besides disclosing potentials of
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FLADRC method, the obtained results expose a promising future of the proposed
method.
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