Controlled invariance for nonlinear differential-algebraic systems

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• 作者：Thomas Berger ^{thomas.berger@uni-hamburg.de" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Differential&ndash ; algebraic equations ; Nonlinear systems ; Descriptor systems ; Controlled invariance ; Output zeroing submanifold ; Zero dynamics
• 刊名：Automatica
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：64
• 期：Complete
• 页码：226-233
• 全文大小：474 K

文摘

We study the concept of locally controlled invariant submanifolds for nonlinear differential–algebraic/descriptor systems. In contrast to classical approaches, we define controlled invariance as the property of solution trajectories to evolve in a given submanifold whenever they start in it. It is then proved that this concept is equivalent to the existence of a feedback which renders the closed-loop vector field invariant in the descriptor sense. This result is exploited to show that the outcome of the differential–algebraic version of the zero dynamics algorithm yields a maximal output zeroing submanifold. The latter is then used to characterize the zero dynamics of the system. In order to guarantee that the zero dynamics are locally autonomous (i.e., locally resemble the behavior of an autonomous dynamical system), sufficient conditions involving the locally maximal output zeroing submanifold are derived.