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Grid-connected stability analysis method based on frequency coupling characteristic quantity

An analysis method and characteristic quantity technology, applied in the grid-connected field, can solve the problems that the impedance measuring instrument cannot be realized, and achieve the effect of avoiding measurement and accurate analysis

Pending Publication Date: 2022-01-25
CHONGQING UNIV +2
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Problems solved by technology

At present, the impedance of the inverter is mainly obtained by means of measurement, and the impedance of the inverter is characterized by measuring the mutual admittance, but obtaining the mutual admittance needs to measure the response current and voltage at different frequencies, while the existing impedance measuring instrument is can not achieve

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  • Grid-connected stability analysis method based on frequency coupling characteristic quantity
  • Grid-connected stability analysis method based on frequency coupling characteristic quantity
  • Grid-connected stability analysis method based on frequency coupling characteristic quantity

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Embodiment Construction

[0026] The present invention is further described below in conjunction with the accompanying drawings of the description, as shown in the figure:

[0027] The grid-connected stability analysis method based on the frequency coupling characteristic quantity of the present invention comprises the following steps:

[0028] S1. Determine the equivalent admittance model considering the frequency coupling phenomenon;

[0029] S2. Based on the equivalent admittance model considering the frequency coupling phenomenon, define the frequency coupling characteristic quantity;

[0030] S3. Construct the solution equation of the frequency coupling feature quantity;

[0031] S4. Measure the equivalent admittance under different grid impedances, and bring the equivalent admittance into the solution equation, and calculate the frequency coupling characteristic quantity;

[0032] S5. Using the frequency coupling feature quantity as a characterization parameter to analyze grid-connected stabili...

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Abstract

The invention discloses a grid-connected stability analysis method based on frequency coupling characteristic quantity. The method comprises the following steps: S1, determining an equivalent admittance model considering a frequency coupling phenomenon; S2, defining a frequency coupling characteristic quantity based on an equivalent admittance model considering a frequency coupling phenomenon; S3, constructing a solving equation of the frequency coupling characteristic quantity; S4, measuring equivalent admittances under different power grid impedances, substituting the equivalent admittances into the solving equation, and performing calculation to obtain a frequency coupling characteristic quantity; and S5, analyzing the grid-connected stability by taking the frequency coupling characteristic quantity as a characterization parameter. According to the method, the frequency coupling characteristic quantity can be effectively and feasibly measured, measurement of mutual admittance is avoided, and the stability of the grid-connected system is accurately and effectively analyzed.

Description

technical field [0001] The invention relates to the field of grid connection, in particular to a grid connection stability analysis method based on frequency coupling characteristic quantities. Background technique [0002] In recent years, renewable energy sources such as photovoltaics and wind power have been used more and more in grid-connected systems, and the coverage has become wider and wider. Grid-connected inverters have also been increasingly used in new energy grid-connected systems; but Due to the complex dynamic characteristics of the grid-connected inverter, after it is applied to the power grid, it will cause oscillation problems, resulting in the instability of the grid-connected system, which will lead to safety accidents. [0003] Therefore, analyzing the stability of the grid-connected system has become a hot spot, and when the impedance value of the grid is known and the impedance of the grid-connected inverter is known, the stability of the grid-connecte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/38H02J2203/20
Inventor 杜雄刘俊良夏翰林李寒江徐亨童程辉
Owner CHONGQING UNIV
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