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Time frequency-domain comprehensive synthesizing method of low-frequency oscillation property of power system

A power system, low-frequency oscillation technology, applied in the direction of reducing/preventing power oscillation, can solve the problems of omission and inability to guarantee the electromechanical oscillation mode, and achieve the effect of overcoming the limitation of system dimension, eliminating the phenomenon of omission and high algorithm accuracy

Inactive Publication Date: 2011-07-27
ZHEJIANG UNIV
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Problems solved by technology

However, when applied to low-frequency oscillation analysis, this method cannot guarantee that all electromechanical oscillation modes can be excited, so there is a risk of missing some important modes

Method used

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  • Time frequency-domain comprehensive synthesizing method of low-frequency oscillation property of power system
  • Time frequency-domain comprehensive synthesizing method of low-frequency oscillation property of power system
  • Time frequency-domain comprehensive synthesizing method of low-frequency oscillation property of power system

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Embodiment 1

[0026] Taking a two-area power system composed of four generator sets as an example, such as figure 1 As shown, a time-frequency domain comprehensive analysis method for low-frequency oscillation characteristics of power systems includes the following steps:

[0027] (1) System modeling.

[0028] For the power system, the detailed data information of each component used for electromechanical simulation and reflecting the actual situation of the system is obtained, and the system detailed model is established to represent the four generating sets in the system (including generator, excitation, prime mover and governor Wait).

[0029] (2) System simplification.

[0030] On the premise of keeping the basic characteristics of the low-frequency oscillation of the power system unchanged as much as possible, the detailed model of the system is simplified by the model simplification method, and the simplified model of the system is obtained.

[0031] The model simplification method...

Embodiment 2

[0046] Taking the China Southern Power Grid system as an example under certain operating conditions, such as figure 1 As shown, a time-frequency domain comprehensive analysis method for low-frequency oscillation characteristics of power systems includes the following steps:

[0047] (1) System modeling.

[0048] The system can be divided into five regional grids, namely Guangdong (including Hong Kong), Guangxi, Yunnan, Guizhou and Hainan. The regional power grids are interconnected through several 500kV tie lines. For the power grid system, obtain the detailed data information of each component used for electromechanical simulation and reflect the actual state of the system, and establish a detailed model of the system to represent all generating units in the system (including generators, excitation, prime movers and governors, etc.) . The system detailed model contains a total of 528 generating units, and the total number of state variables is as high as 7086, which obviou...

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Abstract

The invention discloses a time frequency-domain comprehensive synthesizing method of low-frequency oscillation property of a power system, comprising the following steps: (1) system modeling; (2) system simplification; (3) QR analysis; and (4) Prony analysis. By the method provided by the invention, the QR analysis and the Prony analysis are combined to be matched and confirmed mutually, thus thedifficulty problem that the traditional analyzed method is limited by the number of dimensions is overcome, the omitting phenomenon of the important electromechanical oscillation mode is eliminated, and the oscillation frequency, the vibration model, the damping ratio and the participation factor of each generator set of all the electromechanical oscillation modes in the electric system can be obtained by analysis, the arithmetic in the method has high accuracy and strong reliability and is suitable for analyzing the low-frequency oscillation property of actual large-scale power system.

Description

technical field [0001] The invention belongs to the technical field of low-frequency oscillation analysis of electric power systems, and in particular relates to a time-frequency domain comprehensive analysis method for low-frequency oscillation characteristics of electric power systems. Background technique [0002] At present, the analysis methods on the low-frequency oscillation characteristics of power systems are mainly divided into two categories: frequency domain analysis methods and time domain analysis methods. [0003] The frequency domain analysis method is to analyze the low frequency oscillation characteristics of the system in the complex frequency domain. The most commonly used frequency domain analysis method is the QR analysis method. All the eigenvalues ​​of the system state matrix can be obtained by using the QR analysis method. However, due to the limitation of the dimension of the system matrix, the QR analysis method cannot be directly applied to the ac...

Claims

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Application Information

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IPC IPC(8): H02J3/24
Inventor 徐政黄弘扬
Owner ZHEJIANG UNIV
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