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Method for discriminating time-lag power system stability

A technology of power system stability and judgment method, applied in the field of time delay judgment stability, can solve the problems of incompetence, large time delay of control loop measurement, and harm to the stable operation of the system.

Inactive Publication Date: 2010-07-14
TIANJIN UNIV
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Problems solved by technology

[0004] The above method is only effective when the time lag of the power system is small
In the actual power system, if the communication system is congested, the measurement time lag of the control loop may become very large. At this time, if the design of the wide area controller is not reasonable, it may cause harm to the stable operation of the system.
Therefore, it is necessary to study the topological composition and boundary properties of the stable domain of the power system in a large time-delay space. At this time, the above methods are not competent.

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Embodiment Construction

[0061] In the following, the present invention will be further described in detail from the aspects of the time-delay model of the power system, the stability criterion and its proof on which the present invention is based, the method for judging the stability of the time-delay system of the present invention, and embodiments.

[0062] 1. Power system time-delay model

[0063] The time-delay power system with time-delay link is at the equilibrium point (x 0 ,y 0 ) for linearization:

[0064] Δ x · = A 0 Δx + A 1 Δ x τ 1 + ...

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Abstract

The invention belongs to the technical field of power systems, and relates to a method for discriminating the time-lag power system stability, which comprises the following steps: firstly, utilizing a parameter transformation technology to convert the solving of a large-scale time-lag stable region boundary into search and translation processes of a limited parameter space, and thereby the calculated amount of the time-lag stable region boundary is greatly reduced; and furthermore, utilizing a four-point interpolation method, and by carrying out perturbation on a critical point on the stable region boundary, determining the composition and the boundary local property of a stable region. The invention only needs to track the eigenvalue trajectory of a complex matrix within a limited range, i.e. the invention can solve the stable region and the stable region boundary of the system when being in a large-scale time-lag space, and the computational efficiency is higher.

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] In nature, the future development trend of the system depends on both the current state and the past state. This phenomenon is called time lag. In the wide-area environment, the measurement time delay of the power system is very obvious, so it is of great significance to study the influence of the time delay link on the system stability analysis and controller design [1-5] . [0003] In the time-delay space, all the stable operating points of the power system constitute the stable region of the system. When designing the wide-area controller, it is necessary to ensure that the operating points of the system are located in the stable region. There have been some methods to discuss the solution of the time-delay space stability domain. [6] adopt the frequency domain method to directly solve the ...

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Application Information

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IPC IPC(8): H02J3/00
Inventor 贾宏杰姜懿郎穆云飞
Owner TIANJIN UNIV