Method and device for determining reason of high-frequency oscillation of wind power plant

Abstract

The invention discloses a method and a device for determining high-frequency oscillation reasons of a wind power plant, and the method comprises the steps: building a sweep frequency simulation model corresponding to each piece of oscillation equipment according to the obtained actual equipment parameters of each piece of oscillation equipment in the wind power plant, and determining the sweep frequency impedance characteristics corresponding to each piece of oscillation equipment in a small signal analysis mode; determining an electrical node network according to the obtained topological structure diagram of the wind power plant; according to a preset equipment combination mode, the electrical node network and the sweep frequency impedance characteristic, determining an impedance spectrogram corresponding to each piece of oscillation equipment in the preset equipment combination mode by utilizing a node impedance aggregation calculation mode; and determining the reason of high-frequency oscillation in the wind farm according to the impedance spectrogram. According to the method, the internal equipment of the wind power plant is subjected to refined modeling, the whole wind power plant and the internal equipment individuals are analyzed, high-frequency oscillation determination under the condition of multiple equipment and multiple factors is completed in a refined mode, and the reason of high-frequency oscillation of the internal equipment of the wind power plant is more comprehensively positioned.

Description

technical field [0001] The invention relates to the technical field of wind farms, in particular to a method and device for determining the cause of high-frequency oscillations in a wind farm. Background technique [0002] Due to the large number of power electronic devices and complex control strategies in wind farms, many new problems different from conventional power plants have emerged in the actual operation of wind farms, and high-frequency oscillations are prone to occur among various devices inside the station. High-frequency oscillation causes the voltage of equipment to increase rapidly, resulting in the risk of wind farm off-grid. Through detailed modeling of wind farm equipment, the mechanism of high-frequency oscillation of equipment in the station is studied, which is helpful for solving the problem of wind farm disconnection due to high-frequency oscillation. The net is important. [0003] At present, the main problem of modeling analysis for the research on ...

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Problems solved by technology

[0002] Due to the large number of power electronic devices and complex control strategies in wind farms, many new problems different from conventional power plants have emerged in the actual operation of wind farms.

High-frequency oscillation causes the voltage of equipment to increase rapidly, resulting in the risk of wind farm off-grid. Through detailed modeling of wind farm equipment, the mechanism of high-frequency oscillation of equipment in the station is studied, which is helpful for solving the problem of wind farm disconnection due to high-frequency oscillation. Internet is important

[0003] At present, the main problem of modeling analysis for the research on the mechanism of high-frequency oscillation between internal equipment in wind farms is that the degree of refinement of the modeling is not high. The detailed modeling and analysis from the perspective of the unit group cannot fully model and analyze the internal high-frequency oscillation mechanism of the wind farm

In addition, there is a lack of modeling of the impedance characteristics of each equipment in the station when high-frequency oscillations occur between the wind turbine group, SVG (reactive power compensation equipment), and the main transformer. It is difficult to analyze the oscillation mechanism of the mutual influence between the equipment in the station.

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