Download PDF by Jan Lunze: Feedback Control of Large-Scale Systems

By Jan Lunze

This e-book provides the fundamental tools of suggestions regulate in large-scale platforms, displaying how multivariable suggestions thought should be prolonged to unravel research and layout initiatives for interconnected structures. Emphasis is laid at the derivation of tools that have a decentralized details constitution, that's to claim these which contain numerous weakly coupled selection devices for interpreting the given process or designing the controller. The strategies which are awarded are meant as a foundation for exploring extra particular and complicated equipment which are of modern derivation. The theoretic history of the topic is gifted including an research of the engineering tools and effects, which verify the relevance of methodologies to a number of difficulties and otherwise developed structures. The ebook is geared toward either scholars and training engineers.

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4. 1 1) as the solution of the original LQ problem. P is the symmetric positive definite solution of the algebraic Riccati equation (A ' BR- I S ) , P + P(A - BR- I S) - PBR- I B 'P + Q - S 'R- I S = O. 4. 4. 2) is given by P K = R- 1B / P with as the symmetric positive definite solution of P P P P (A' - dI ) + (A - dI ) - BR- 1B / + Q = O. 4. 4. 4. 16) holds. 4. 4. 4. 17) is stable. A necessary condition for the closed-loop stability and a class of controller parameters can be given in terms of the static reinforcement Ks (cf.

1). 4. 1 7) the following asserĀ­ tions hold. 4. 1 8) det(KsKI ) > O. 4. 4. 4. 4. K 1 9) is stable for all a E (0, a) and b E [0, b) if and only if I satisfies the condition K Re {A; [Ks d } > O. 4. 1 8) can be referred to as the negative feedback condition for multi variable PI control systems. 4. 17) should counteract the control error. For single-input single-output systems it has the form kskI > 0. 4. 4. 17) should exist such that the closed-loop system is stable. The second part of the theorem concerns the following low-gain feedback strategy.

7) is given by v(x) = x '(A 'P + PA)x. 3. 10) holds for some symmetric positive definite matrix Q. 7) is stable if and only if there exists a symmetric positive definite matrix Q such that the Lyapunov equation (2. 3 . 1 0) has a positive definite solution P . Note that for the stability of linear systems the existence o f some Lyapunov function is not only sufficient but also necessary. 3. 10) then its solution is positive definite for an arbitrary positive definite matrix Q. 9) can be found if and only if the system is stable.

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