Method for evaluating forced oscillation influence in interconnected large power grid

A technology of forced oscillation and large power grid, applied in the direction of reducing/preventing power oscillation, electrical digital data processing, special data processing applications, etc., can solve problems such as unsatisfactory suppression effect, and achieve calculation results with practical physical meaning and comprehensive considerations , the effect of high practical value

Active Publication Date: 2013-11-13
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0003] It is generally believed that when the frequency of the disturbance is the same or close to the natural frequency of the system, the system may generate a resonance-type underdamped low-frequency oscillation, which is generally called forced oscillation, and the suppression effect of PSS is not ideal at this time.

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  • Method for evaluating forced oscillation influence in interconnected large power grid
  • Method for evaluating forced oscillation influence in interconnected large power grid
  • Method for evaluating forced oscillation influence in interconnected large power grid

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Embodiment Construction

[0036] The implementation of the present invention in the Chongqing power grid will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] figure 1 It is a flowchart of an embodiment of the method for evaluating the impact of forced oscillation in the interconnected large power grid of the present invention. The method for evaluating the impact of forced oscillation in the interconnected large power grid provided by the present invention includes the following steps:

[0038] A. Taking the Chongqing Power Grid in the Central China-North China Power Grid as the research object power grid, establish a typical flat-scale operation mode of the Central China-North China Power Grid in the summer of 2013. The total installed capacity of the Central China-North China system is 317 million kilowatts, and the rotating reserve is 5.6 million kilowatts. The power of the system connection line: Central China sends 5 million kilowatts to...

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Abstract

The invention relates to a method for evaluating forced oscillation influence in an interconnected large power grid. The method includes the following steps: A. determining a typical operation mode of a power system; B. obtaining an oscillation mode of a power grid to be researched and a characteristic of the oscillation mode; C. finding out units corresponding to forced oscillation having the largest influence on a generator set, a local power grid and the interconnected power grid and disturbing signal characteristics of the units; D. summarizing a general characteristic rule of the forced oscillation influence. By means of the method, the defect that the existing evaluating method only considers section low-frequency oscillation frequency and only aims at influence of the forced oscillation on a large power grid is overcome, stable parameters of the generator set can be checked by combining practical recording data, the method has the advantages of being good in generality and adaptation, comprehensive in considering factors and reasonable in scheme, facilitating fast decision making and the like and has high practical value and good market prospects.

Description

technical field [0001] The invention belongs to the field of dynamic stability analysis of power systems, and in particular relates to a method for evaluating the impact of forced oscillation in interconnected large power grids in small disturbance stability analysis. Background technique [0002] With the development of the power grid, long-distance and heavy-duty transmission lines continue to appear, and interconnected power grids will also be connected through weak tie lines. The application of fast-response high-magnification excitation systems is also gradually increasing, resulting in low-frequency oscillations. , the dynamic stability of the system decreases. In the field of power system dynamic stability analysis, the method of using Prony algorithm to analyze the small disturbance stability of the system has been widely recognized. The Prony algorithm can effectively find the negative damping and weak damping modes of the system. The PSS designed based on the nega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24G06F19/00
Inventor 李再华黄淼唐晓骏陈涛王青吴丽华马世英李俊杰朱小军
Owner STATE GRID CORP OF CHINA
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