Method for analyzing impact on ultralow frequency oscillation of power system from uncertain parameters

A technology for determining parameters and power systems, applied in the direction of reducing/preventing power oscillations, circuit devices, AC network circuits, etc., and can solve problems such as unclear mechanism analysis

Active Publication Date: 2017-09-15
YUNNAN POWER GRID
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Problems solved by technology

[0006] The invention provides a method for analyzing the influence of uncertain parameters on power system ultra-low frequency oscillation

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  • Method for analyzing impact on ultralow frequency oscillation of power system from uncertain parameters
  • Method for analyzing impact on ultralow frequency oscillation of power system from uncertain parameters
  • Method for analyzing impact on ultralow frequency oscillation of power system from uncertain parameters

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[0066] The present invention will be further described in detail below in conjunction with the examples.

[0067] Those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be considered as limiting the scope of the present invention. If no specific technique or condition is indicated in the examples, it shall be carried out according to the technique or condition described in the literature in this field or according to the product specification. The products used are those whose manufacturers are not indicated, and they are all conventional products that can be obtained through purchase. The methods not specifically described in the present invention can be carried out according to conventional methods in the technical field.

[0068] In an embodiment of the present invention, a method for analyzing the influence of uncertain parameters on power system ultra-low frequency oscillation is provided, such ...

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Abstract

The invention relates to a method for analyzing the impact on the ultralow frequency oscillation of a power system from uncertain parameters, and belongs to the technical field of grid safety. The method comprises the steps: building a unified frequency model which comprises a main generator set speed regulator of a system and a prime motor model; obtaining set parameters of the unified frequency model according to the operation state of the system, and selecting the uncertain parameters to be researched; calculating a transfer function and a characteristic polynomial, comprising the uncertain parameters, of the unified frequency model; calculating the expression of the characteristic polynomial at the ultralow frequency, and analyzing the impact on the stability of the system through the zero exclusion principle; drawing the value set of the characteristic polynomial through a value set method, and verifying and analyzing the impact on the stability of the system from the uncertain parameters. The method achieves the mechanism analysis of the impact on the ultralow frequency oscillation from the parameters of the system, is simple, is effective, and can reflect the cause of the ultralow frequency oscillation so as to take corresponding measures to inhibit the ultralow frequency oscillation.

Description

technical field [0001] The invention belongs to the technical field of power grid safety, and in particular relates to a method for analyzing the influence of uncertain parameters on ultra-low frequency oscillation of a power system. Background technique [0002] In recent years, ultra-low frequency oscillations with an oscillation frequency lower than 0.1 Hz have appeared in power grids with a high proportion of hydropower. For example, the output of hydropower in Yunnan Power Grid accounts for about 75% of the output of the entire grid. After Yunnan Power Grid implemented the asynchronous networking operation mode in 2016, its power generation is mainly connected to the main grid through DC transmission lines. Due to the negative damping effect of the inherent "water hammer effect" of hydroelectric units, when the frequency of Yunnan power grid passes through the dead zone of primary frequency modulation of hydroelectric units under small disturbances, the frequency of Yun...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 黄伟黄润吴琛张杰
Owner YUNNAN POWER GRID
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