Journal of Central South University

, Volume 23, Issue 10, pp 2616–2629 | Cite as

Proportional integral derivative controller design using Legendre orthogonal functions

Mechanical Engineering, Control Science and Information Engineering
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Abstract

The Legendre orthogonal functions are employed to design the family of PID controllers for a variety of plants. In the proposed method, the PID controller and the plant model are represented with their corresponding Legendre series. Matching the first three terms of the Legendre series of the loop gain with the desired one gives the PID controller parameters. The closed loop system stability conditions in terms of the Legendre basis function pole (λ) for a wide range of systems including the first order, second order, double integrator, first order plus dead time, and first order unstable plants are obtained. For first order and double integrator plants, the closed loop system stability is preserved for all values of λ and for the other plants, an appropriate range in terms of λ is obtained. The optimum value of λ to attain a minimum integral square error performance index in the presence of the control signal constraints is achieved. The numerical simulations demonstrate the benefits of the Legendre based PID controller.

Key words

PID controllers orthogonal functions legendre functions moment matching PI controller PD controller 

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© Central South University Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Electrical Engineering, Khomeinishahr BranchIslamic Azad UniversityIsfahanIran

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