Method for calculating electromechanical oscillation mode of time-delay power system based on low-order IGD-LMS algorithm

A power system and electromechanical oscillation technology, applied in the field of power system computing technology, can solve problems such as matrix dimension limitation efficiency

CN108808702AInactive Publication Date: 2018-11-13SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-11-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for calculating the electromechanical oscillation mode of a time-delay power system based on a low-order IGD-LMS algorithm. The method comprises the following steps: establishing a dynamic model of the time-delay power system and linearizing the dynamic model into a set of time-delay differential equations; reordering state variables of the time-delay power systemin the time-delay differential equations into state variables unrelated to time delay and state variables related to the time delay; converting calculation of eigenvalues of the time-delay power system into calculation of eigenvalues of an infinitesimal generator; discretizing the infinitesimal generator to obtain a low-order discretized matrix of the infinitesimal generator and further obtain a low-order discretized inverse matrix of the infinitesimal generator; performing sparse eigenvalue calculation aiming at the low-order discretized inverse matrix of the infinitesimal generator to obtainapproximate eigenvalues, and correcting the approximate eigenvalues to obtain exact eigenvalues of the time-delay power system. The exact eigenvalues correspond to the electromechanical oscillation modes of the time-delay power system.
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Description

technical field

[0001] The present invention relates to the technical field of power system calculation, in particular to a calculation method for time-delay power system electromechanical oscillation mode based on low-order IGD-LMS algorithm. IGD-LMS is the English abbreviation of "Infinitesimal Generator Discretization With Linear Multistep", and its Chinese meaning is: infinitesimal Generator linear multistep discretization. Background technique

[0002] The development trend of modern power system to large-scale interconnected grid makes interval low-frequency oscillation gradually become the bottleneck restricting the stability of power system small disturbance. For large-scale interconnected transmission systems, the traditional Power System Stabilizer (PSS) can effectively deal with local low-frequency oscillations, but it does not consider wide-area measurement information and cannot effectively weaken interval low-frequency oscillations.

[0003] The wide-area meas...

Examples

Embodiment Construction

[0089]It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0090] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0091] In a typical implementation of the present application, such as figure 1 Shown: The calculation method of...