Discrimination method of delay dependent robust stability of power system

A discriminant method and technology of power system, applied in the field of power system, can solve problems such as the influence of method calculation efficiency, reduce the conservatism of the method, and reduce the conservatism of the Lyapunov time-delay stability criterion
CN101645601AInactive Publication Date: 2010-02-10TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2010-02-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of power systems and relates to an improved discrimination method of Lyapunov robust stability of a power system containing uncertain delay links, which ischaracterized by solving the Lyapunov functional of a delay system based on the Krasovskii theory, then expressing the derived function of a system trajectory from the functional by a group of linearmatrix inequalities (LMI), reducing the conservation of the criterion by introducing a few necessary loose terms in the process of deducing functional derivatives and then transforming the disturbance terms containing uncertainties by utilizing the Schur complement, thereby obtaining the stability criterion. The method of the invention has the advantages of less conservation and high operation efficiency.
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Description

technical field

[0001] The invention belongs to the technical field of electric power systems, and relates to a method for judging stability with uncertain time lag. Background technique

[0002] In nature, the future development trend of the system depends on both the current state and the past state. This kind of phenomenon is called time lag [1-2] . The time-delay phenomenon widely exists in all links of the power system, and it is an important cause of control equipment failure, system deterioration and instability. important practical significance [2-4] .

[0003] Studies on the stability of time-delay systems have been carried out earlier [1] , as early as the 1950s, O.J.Smith proposed the complete theory of Smith predictor [5] , when the time-delay variation law of the system is known, the known fixed time-delay in the transfer function can be completely eliminated through it, so that it can be simplified as a general system for consideration; in addition, in the...

Claims

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