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Self-tuning PID controller using Newton-Raphson search method

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3 Author(s)
Rad, A.B. ; Dept. of Electr. Eng., Hong Kong Polytech. Univ., Kowloon, Hong Kong ; Wai Lun Lo ; Tsang, K.M.

A new algorithm for self tuning of proportional-integral-derivative (PID) controllers is proposed. A combined least-squares estimation and Newton-Raphson search technique is used to determine the ultimate gain and period of an unknown system for the purpose of automatic tuning of PID controllers based on Ziegler and Nichols (ZN) or refined Ziegler and Nichols (RZN) formulas. The proposed algorithm can be applied to systems with known time delay, as well as those with unknown dead time. Simulation studies are used to demonstrate the performance of this algorithm. The performance of this PID self tuner is also compared with a popular commercial auto-tuner for simulated systems and a laboratory-scale real plant

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:44 ,  Issue: 5 )

Date of Publication:

Oct 1997

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