Optimal pole assignment for discrete-time systems via Stein equations

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Optimal pole assignment for discrete-time systems via Stein equations

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This study is concerned with designing a feedback gain to minimise a quadratic performance index with guaranteed pole locations for closed-loop discrete-time linear systems. Firstly, a method that shifts the open-loop poles to desired locations by using a parametric linear Stein equation is presented. Then a recursive approach is proposed to shift every eigenvalue of a discrete-time linear system separately without mode decomposition in each step. By using such method, it is required to solve a linear Stein matrix equation of low order in each step. The presented method yields a solution which is optimal with respect to a quadratic performance index that can be obtained explicitly. The attractive feature of this method comparing with existing results is that it enables solutions to complex problems to be easily found without solving any non-linear algebraic Riccati equations. Moreover, analytical solutions can be obtained which may have advantages in some design problems. Numerical examples illustrate the proposed approach.

Inspec keywords: feedback; closed loop systems; control system synthesis; pole assignment; minimisation; open loop systems; eigenvalues and eigenfunctions; linear quadratic control; performance index; discrete time systems; matrix algebra

Other keywords: optimal open-loop pole assignment; parametric linear Stein matrix equation; linear quadratic control; mode decomposition; eigenvalue method; feedback gain design; nonlinear algebraic Riccati equation; recursive approach; quadratic performance index minimisation; closed-loop discrete-time linear system

Subjects: Discrete control systems; Control system analysis and synthesis methods; Optimal control; Optimisation techniques; Linear algebra (numerical analysis)

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