Photovoltaic inverter parameter identification method and device based on port impedance characteristics

A photovoltaic inverter and parameter identification technology, which is applied in the direction of circuit devices, photovoltaic power generation, AC network circuits, etc., can solve the problems of low identification accuracy of control system parameters, inconvenient system modeling and analysis, etc.

Active Publication Date: 2021-05-28
ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY +3
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Problems solved by technology

However, for reasons of confidentiality, merchants will not fully disclose the actual PV inverter controller parameters, that is, there is a "grey box" problem, which brings inconvenience to system modeling and analysis
At present, a few literatures have studied the problem of paramete

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  • Photovoltaic inverter parameter identification method and device based on port impedance characteristics
  • Photovoltaic inverter parameter identification method and device based on port impedance characteristics
  • Photovoltaic inverter parameter identification method and device based on port impedance characteristics

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Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] Such as figure 1 As shown, the present invention provides a photovoltaic inverter parameter identification method based on port impedance characteristics, including:

[0049]Step S102, determine the admittance matrix model of the photovoltaic inverter in the dq coordinate system according to the controller structure, filter structure and electrical parameters of the photovoltaic inverter.

[0050] Among them, since the circuit structure of the photovol...

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Abstract

The invention provides a photovoltaic inverter parameter identification method and device based on port impedance characteristics, and the method comprises the steps: determining an admittance matrix model of a photovoltaic inverter in a dq coordinate system according to a controller structure, a filter structure and electrical parameters of the photovoltaic inverter; obtaining admittance data of an AC side port of the photovoltaic inverter under multiple frequencies, and performing accurate vector fitting on each frequency and the corresponding admittance data to obtain a fitting transfer function; and according to the fitting transfer function, calculating the elements in the first row and the second column of the admittance matrix model to obtain an identification result of the to-be-identified parameter. According to the method, accurate controller parameter identification is realized through impedance characteristics, an accurate and feasible method is provided for photovoltaic inverter parameter identification, and the accurate controller parameters can be obtained through external characteristics of the photovoltaic inverter to help to analyze the grid connection process of the photovoltaic power generation system.

Description

technical field [0001] The invention relates to photovoltaic power generation technology, in particular to a photovoltaic inverter parameter identification method and device based on port impedance characteristics. Background technique [0002] The constraints of global energy resources and the continuous deterioration of the ecological environment are severe challenges facing human society today. The traditional energy development path dominated by coal and oil is unsustainable, and energy transformation has become an inevitable trend. Renewable energy such as wind energy, solar energy and water energy has been gradually developed and utilized on a large scale, promoting the continuous development of energy in the direction of low-carbon, clean and intelligent. The relevant report of the Chinese government pointed out that by 2050, China will form an energy strategy system dominated by renewable energy, and the proportion of renewable energy will account for 60% of energy c...

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/381H02J2203/20H02J2300/24Y02E10/56
Inventor 吕敬王潇王哲吴林林刘辉李蕴红徐曼邓晓洋孙雅旻孙大卫苏田宇杨艳晨
Owner ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY
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