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Trajectory eigenvalue-based system transient stability judgment and disturbance type selection method

A transient stability and characteristic root technology, applied in the field of power engineering, can solve problems such as the inability to accurately reflect the influence of nonlinear and time-varying factors on the oscillation frequency, and achieve the effect of accurate judgment and disturbance type screening, and strong practicability

Inactive Publication Date: 2017-08-18
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, the system at this time is at an unbalanced point, and the unbalanced power is not zero. The dynamic behavior of the system is no longer determined by the characteristic root alone, and the influence of unbalanced power must also be taken into account
The characteristic root method of the trajectory section ignores the influence of unbalanced power, and cannot accurately reflect the influence of nonlinear and time-varying factors on the oscillation frequency

Method used

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  • Trajectory eigenvalue-based system transient stability judgment and disturbance type selection method
  • Trajectory eigenvalue-based system transient stability judgment and disturbance type selection method
  • Trajectory eigenvalue-based system transient stability judgment and disturbance type selection method

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[0040] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] Provide a system transient stability judgment method based on trajectory characteristic root, such as figure 1 shown, including the following steps:

[0042] S1. Use Laplace inverse transform to linearize the generator, governor, excitation system, network equation and load at the unbalanced point, and establish a high-order linearization model of the system;

[0043] The inverse Laplace transform method has the advantages of fastness and accuracy, and can handle various complex models, showing strong practicability. The specific model after the linearization processing method of each sub-module is as follows:

[0044] a. Linearization of generator model

[0045] The generator model adopts 3rd order E′ q Variation model, wh...

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Abstract

The invention provides a trajectory eigenvalue-based system transient stability judgment and disturbance type selection method. A state equation in an unsteady state condition, and a linear processing method for a generator, a governor, an excitation system, a network equation and load at a non-equilibrium point are studied. A higher-order linearization model for the system is built, continuous solution of the eigenvalue in the unsteady state condition is realized, a trajectory eigenvalue curve is obtained, and the trajectory eigenvalue curve characteristics are analyzed. through studying system dynamic information in the trajectory eigenvalue under load disturbance and three-phase short circuit fault, a limitation whether the real part of the eigenvalue is larger than zero does not exist, a potential law is explored, a mapping relationship among the system transient stability, a disturbance type and the trajectory eigenvalue is built, and thus, quick and accurate system transient stability judgment and disturbance type selection can be realized. Through example analysis on WSCC 3-machine 9-point, the conclusion obtained by the method of the invention is consistent with a relative power angle curve of the generator, and feasibility of the method is verified.

Description

technical field [0001] The invention relates to the field of electric power engineering, in particular to a system transient stability judgment and disturbance type screening method based on trajectory characteristic roots. Background technique [0002] The transient stability analysis of power system has always been a research hotspot in the field of power engineering. With the development of the power system, the dynamic characteristics of the system are more complex, reflecting stronger nonlinearity and uncertainty, and it is becoming more and more difficult to use the characteristic root of the equilibrium point to reflect the oscillation characteristics of the system. [0003] In the small disturbance analysis of the power system, the state matrix of the system is usually obtained by linearization at the equilibrium point, and the eigenvalues ​​of the state matrix are analyzed to judge the small disturbance stability characteristics of the system. However, the continuo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06Q50/06G06F17/50
CPCG06F30/367G06Q50/06H02J3/00H02J2203/20Y02E60/00
Inventor 王德林潘志豪袁优郭成康积涛
Owner SOUTHWEST JIAOTONG UNIV
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