Method for distinguishing stability of muilt-timelag electric power system

A technology for power system stability and discrimination method, applied in the field of time-delay stability determination, can solve problems such as the influence of method calculation efficiency and the reduction of method conservatism

Inactive Publication Date: 2009-01-21
TIANJIN UNIV
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Problems solved by technology

[11] reduced the conservatism of the method by adding loose items in the derivation process of the single-delay stability criterion, and achieved good results. Literature [12] extended it to multi-delay systems to form the so-called free weight matrix ( Free Weighting Matrix) method, but due to the introduction of a large number of loose items, the calculation efficiency of the method is greatly affected

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  • Method for distinguishing stability of muilt-timelag electric power system
  • Method for distinguishing stability of muilt-timelag electric power system
  • Method for distinguishing stability of muilt-timelag electric power system

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Embodiment Construction

[0021] The invention utilizes Leibniz-Newton formula, relaxation and other means to reduce the conservatism of the multi-time-delay power system stability discrimination method, and improves the operating efficiency of the system by eliminating redundant items generated in the method derivation process. In the following, the present invention will be further described in detail from several aspects of the power system time-delay model, the stability criterion on which the present invention is based and its proof, the present invention's method for judging the stability of a system with a time-delay link, and embodiments.

[0022] 1. Power system time-delay model

[0023] The power system model with time-delay link can be expressed as:

[0024] z · = f ( z , ...

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Abstract

The present invention belongs to the technical field of power system, and relates to a method of time-delay stability criterion. The method adopts the idea of Lyapunov stability criterion; an appropriate Lyapunov functional is selected at first, and is transformed into a group of linear matrix inequalities (LMI) for solution through the Leibniz-Newton formula, relaxation and other means; simultaneously, the redundant items which are generated in the deduction process is eliminated so as to acquire the stability criterion. In the method, the items to be calculated are greatly reduced, and the operating efficiency is correspondingly improved. Moreover, because the time-delay stage widely occurs in various systems, the method is suitable for various environments with the time delay.

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to a method for determining stability with time delay. Background technique [0002] The time lag phenomenon widely exists in all aspects of the power system, but the traditional control signal is mainly taken from the local measurement device, the time lag is so small that it is usually not considered [3] . However, in the case of wide-area control, the time-lag of the measurement link is very obvious, so it is of great practical significance to study the influence of the time-delay link on the stability of the power system. [0003] People have carried out research on the stability of time-delay dynamical systems very early, and the Smith prediction theory proposed in the 1950s [4] , can completely eliminate the known fixed time-delay in the system transfer function, thereby simplifying it into a general system for consideration; and for linear fixed-time-delay systems, a re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/24
Inventor 贾宏杰安海云余晓丹
Owner TIANJIN UNIV
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