Power grid inductance detection method

A detection method and inductance technology, which is applied in the direction of measuring resistance/reactance/impedance, photovoltaic power generation, electrical components, etc., can solve the problem that the grid inductance measurement method cannot guarantee feasibility and accuracy at the same time, and achieve important engineering application value and ease of use Realize the effect of high detection accuracy

Active Publication Date: 2019-08-06
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

[0004] The above grid inductance measurement method cannot guarantee the feasibility and accuracy of the realization at the same time

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  • Power grid inductance detection method
  • Power grid inductance detection method

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Embodiment Construction

[0051]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0052] refer to Figure 1 to Figure 6 ,like Figure 1 to Figure 6 As shown, a grid inductance detection method includes the establishment of a photovoltaic inverter system model based on grid inductance and a grid inductance detection method based on voltage oscillation characteristics; the photovoltaic inverter system model based on grid inductance is used as a power grid based on voltage oscillation characteristics The basis of the inductance detection method, the final calculation result of the method is obtained from the power grid inductance detection method based on the voltage oscillation ch...

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Abstract

The invention discloses a power grid inductance detection method. Photovoltaic inverter system model establishment based on a power grid inductance and a power grid inductance detection method based on a voltage oscillation characteristic are included. The photovoltaic inverter system model based on the power grid inductance is used as a basis of the power grid inductance detection method based onthe voltage oscillation characteristic. A final calculation result of the method is obtained based on the power grid inductance detection method of the voltage oscillation characteristic. In the invention, an inverter end voltage analysis model is established, a mechanism of an interaction among a photovoltaic power generation control system, a networking filter and a power grid impedance is researched, an inverter end voltage oscillation characteristic in a power adjustment process is analyzed, the power grid inductance detection method based on the inverter end voltage oscillation characteristic is proposed, and high-precision online detection of the power grid inductance is realized.

Description

technical field [0001] The invention relates to a grid inductance detection method, in particular to a grid inductance detection method based on inverter terminal voltage oscillation characteristics. Background technique [0002] At present, vigorously developing photovoltaic power generation is an important way to deal with the energy crisis and environmental pollution, and to promote energy low-carbon transformation. Due to the limitation of land resources and sunlight, large-scale photovoltaic power plants are often located in remote areas with weak grid structures. With the increase of the grid-connected scale of photovoltaic power plants, the connected grid presents the characteristics of a weak grid, which threatens the stability of the grid-connected photovoltaic power generation system. Accurate detection of grid inductance can enable the photovoltaic inverter to obtain grid-side state changes in a timely manner and correctly match inverter control system parameters...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26H02J3/38
CPCH02J3/383G01R27/26H02J2203/20Y02E10/56
Inventor 严干贵朱微杨瀛段双明李洪波刘莹蔡长兴
Owner NORTHEAST DIANLI UNIVERSITY
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