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A method for testing and analyzing the output impedance frequency characteristics of wind farms

A frequency characteristic test and output impedance technology, which is applied in the field of wind farm output impedance frequency characteristic test and analysis, and can solve the problem of inability to effectively analyze wind farm impedance characteristics.

Active Publication Date: 2021-09-10
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +2
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Problems solved by technology

[0004] In order to obtain the frequency characteristics of the above-mentioned equivalent impedance, the present invention proposes a method for testing and analyzing the frequency characteristics of the wind farm output impedance, thereby solving the problem that the impedance characteristics of the wind farm cannot be effectively analyzed in the prior art

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  • A method for testing and analyzing the output impedance frequency characteristics of wind farms
  • A method for testing and analyzing the output impedance frequency characteristics of wind farms
  • A method for testing and analyzing the output impedance frequency characteristics of wind farms

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Embodiment Construction

[0022] The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not intended to automatically limit the application if in fact more than one invention is disclosed The scope is any individual invention or inventive concept.

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Abstract

The invention proposes a method for testing and analyzing the output impedance frequency characteristics of a wind farm, which includes: when the power system is subjected to a disturbance signal that causes the voltage on the bus of the wind farm to change, and the disturbance source of the disturbance signal is located outside the wind farm, according to the set The sampling frequency obtains the voltage sampling signal and current sampling signal on the bus of the wind farm; through the fast Fourier transform, the voltage sampling signal and the current sampling signal are transformed into corresponding voltage spectrum signals and current spectrum signals respectively; and then the voltage spectrum signals and The corresponding voltage value and current value in the current spectrum signal are compared to obtain a number of continuous impedance values; an output impedance spectrum curve of the wind farm is generated according to the obtained impedance values. The invention utilizes disturbance signals that may appear in the power grid at any time, collects and samples relevant electrical quantity signals in real time, and obtains the output impedance frequency characteristics of the wind farm through analysis and transformation, thereby providing effective tools and means for studying the impedance characteristics of the wind farm.

Description

technical field [0001] The invention belongs to the field of power system parameter measurement, in particular to a method for testing and analyzing the output impedance frequency characteristics of a wind farm. Background technique [0002] In recent years, my country's new energy industry has continued to grow, its share in electric energy production has gradually increased, and it has entered a stage of large-scale development. There are a large number of nonlinear equipment in the power grid, such as direct current transmission, current locomotives, electric arc furnaces, etc., which will generate a large number of harmonics during operation, forming background harmonics. [0003] Background harmonics may spread and amplify in wind farms and photovoltaic power stations, and even resonate, causing overvoltage and overcurrent in the converter circuit, causing damage to equipment in the entire power system; the occurrence of this phenomenon is fundamentally It depends on t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
Inventor 韩民晓张汉花于家英李旭涛黄永宁杨雪红
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY
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