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Online identification method for electromechanical oscillation modal characteristic parameters of electric power system

A technology of power system and characteristic parameters, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of unable to effectively eliminate signal noise, huge amount of calculation, low accuracy, etc., and achieve high practical application value , High recognition accuracy and good applicability

Inactive Publication Date: 2019-05-14
NORTHEAST DIANLI UNIVERSITY +2
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an online identification method for the characteristic parameters of the electromechanical oscillation mode of the power system, which is used to solve the problem that the traditional method of power system small disturbance stability analysis, extraction and identification of the characteristic parameters of the electromechanical oscillation mode cannot effectively eliminate the Noise-like, low accuracy, large amount of calculation and low effectiveness

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  • Online identification method for electromechanical oscillation modal characteristic parameters of electric power system
  • Online identification method for electromechanical oscillation modal characteristic parameters of electric power system
  • Online identification method for electromechanical oscillation modal characteristic parameters of electric power system

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Embodiment

[0112] For example figure 2 The shown IEEE 4-machine 2-area power system is subjected to small disturbance online stability analysis. figure 2 Among them, G1, G2, G3 and G4 are the numbers of the four generators, 1, 2, 3, 4, 10, 20, 101, 11, 12, 13, 14, 110 and 120 are the numbers of the buses in the power system respectively, Areal1 and Areal2 represent two different areas of the 4-machine 2-area system respectively.

[0113] Set the operation mode with the load random fluctuation amplitude as 5% of the original base value to simulate the environmental excitation suffered by the power system, and select the active power generated by each generator in the power system for 10 consecutive minutes as the random response signal.

[0114] 1. Use the Small Signal Analysis Stability (SSAT) method to calculate the modal parameters of different electromechanical oscillation modes of the power system. The calculation results are shown in Table 1. The modal shapes corresponding to the...

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Abstract

The invention discloses an online identification method for electromechanical oscillation modal characteristic parameters of an electric power system, and belongs to the technical field of electric power system state analysis. On the basis that random data generated due to uncertain factor interference in the environment where the power system is located is selected, the application of a new analysis method of O3KID-ERA / DC is provided to carry out small interference on-line calculation and analysis of the power system. Analysis of small interference of electric power system is carried out through example simulation calculation verification. The ERA / DC algorithm has good applicability; in addition, compared with a traditional classic SSI algorithm, the method has higher robustness. According to the method, more excellent capability is shown on the precision and stability of modal parameter identification, a new and reliable solution is provided for real-time online monitoring and analysis of the small interference stability level based on random data in the operation process of the power system, and the method has high practical application value.

Description

technical field [0001] The invention belongs to the technical field of power system state analysis, and in particular relates to an online identification method for characteristic parameters of electromechanical oscillation modes of a power system based on random response data. Background technique [0002] Small-disturbance stability refers to the ability of a power system in normal operation to return to its original operating state after being subjected to a small, instantaneous but immediately disappearing disturbance, or the disturbance can be approximated by the original operating state although the disturbance does not disappear. Indicates a possible new health state. Power systems will be affected by various uncertain factors in actual operation, such as load fluctuations, changes in power system component parameters, changes in line network topology, and so on. With the large-scale development and utilization of new energy sources, the structural form, operating ch...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 杨德友王丽馨李德鑫蔡国伟孙正龙王博李同孙平郭利刘座铭毕正军王佳蕊孙旭徐博费藤达丁伟蔡丽霞刘畅孟涛高松
Owner NORTHEAST DIANLI UNIVERSITY
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