Design of Linear Active Disturbance Rejection Control Based on Fuzzy Theory

• Main Authors: TRAN, VAN-KIEN, 陳文堅
• Other Authors: SU, TE-JEN
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/6hx9pr

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 III FLADRC method, the obtained results expose a promising future of the proposed method.