A relaxed quadratic function negative-determination lemma and its application to time-delay systems

• Autores: Chuan-Ke Zhang, Fei Long, Yong He, Wei- Yao-, Lin Jiang, Min Wu
• Localización: Automatica: A journal of IFAC the International Federation of Automatic Control, ISSN 0005-1098, Nº. 113, 2020
• Idioma: inglés
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• Resumen

  • The quadratic function with respect to the time-varying delay has often been introduced for the analysis of systems with time-varying delays. To determine the negative definiteness of such function, this paper develops a parameter-adjustable-based lemma, which contains the lemma popularly used in literature as a special case and has potential to reduce the conservatism without requiring extra decision variables. A stability criterion for a linear time-delay system is established by using the proposed lemma, whose advantage is demonstrated via a numerical example, and the criterion is finally applied to analyze the stability of load frequency control scheme for a single-area power system.