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Sub-synchronous oscillation identification method and device for wind power plant

A technology of subsynchronous oscillation and identification method, applied in circuit devices, pattern recognition in signals, electrical components, etc., can solve the problem of subsynchronous oscillation identification of non-noise-like signals.

Pending Publication Date: 2020-06-26
YUNNAN POWER GRID
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Problems solved by technology

[0005] This application provides a subsynchronous oscillation identification method and device for wind farms to solve the problem of not being able to identify potential subsynchronous oscillations in noise-like signals

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  • Sub-synchronous oscillation identification method and device for wind power plant
  • Sub-synchronous oscillation identification method and device for wind power plant
  • Sub-synchronous oscillation identification method and device for wind power plant

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[0044] The embodiments will be described in detail hereinafter, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following examples do not represent all implementations consistent with this application. These are merely examples of systems and methods consistent with aspects of the present application as recited in the claims.

[0045] see figure 1 It is a structure in which the wind farm is connected to the grid through a series compensation line. After the electric energy generated by the wind farm is stepped up by the transformer, it is connected to the AC power grid through the AC line containing the series compensation capacitor. In the figure, L T is the wind farm outlet transformer inductance, R L , L L 、C L Respectively, the resistance, indu...

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Abstract

The invention provides a sub-synchronous oscillation identification method and device for a wind power plant. The method comprises the following steps: acquiring a noise-like signal generated when a series compensation capacitor is connected into a wind power plant; carrying out wavelet decomposition on the noise-like signal; judging whether the frequency range of each wavelet component contains asub-synchronous oscillation frequency or not; if any wavelet component contains the sub-synchronous oscillation frequency, completely reserving the wavelet component, and if any wavelet component does not contain the sub-synchronous oscillation frequency, obtaining wavelet components decomposed from the wavelet component; if the frequency ranges of the wavelet components of the next layer containthe sub-synchronous oscillation frequency, performing threshold filtering on the wavelet components, and otherwise, filtering out the wavelet components; and finally, adding all the reserved waveletcomponents to reconstruct a new effective signal, and performing calculation to obtain sub-synchronous oscillation mode information. According to the method provided by the invention, the potential sub-synchronous oscillation mode in the noise-like signal can be accurately identified, and an early warning can be issued for the potential sub-synchronous oscillation risk of the wind power plant.

Description

technical field [0001] The present application relates to the technical field of power system protection, in particular to a method and device for identifying subsynchronous oscillations in wind farms. Background technique [0002] In order to improve the utilization rate of wind energy, large wind farms often adopt long-distance transmission. Long-distance AC transmission systems usually use series compensation capacitors to improve line transmission capacity. However, the energy interaction between series compensation capacitors and wind farms can easily lead to sub-synchronous oscillation (SSO) in wind farms. Subsynchronous oscillation will cause great damage to the power transmission system in a very short period of time, leading to serious accidents such as damage to the shafting of the wind turbine generator and transformer damage. Therefore, it is urgent to propose an effective method to realize the early detection of wind farm subsynchronous oscillation. [0003] L...

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Application Information

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IPC IPC(8): H02J3/00G06K9/00
CPCH02J3/00G06F2218/02
Inventor 胡凯赵岳恒钱纹王志敏刘民伟王凌谊赵爽陈宇张秀钊刘娟
Owner YUNNAN POWER GRID
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