Prediction method and terminal equipment for subsynchronous resonant frequency of direct-drive wind farms

A sub-synchronous resonance and prediction method technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as unit shutdown, sub-synchronous resonance, equipment damage, etc., to suppress sub-synchronous resonance, avoid sub-synchronous resonance, and ensure The effect of continuous safe and stable operation

Active Publication Date: 2022-08-05
SHENZHEN UNIV
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Problems solved by technology

Different from traditional power generation equipment, new energy generating sets mostly use power electronic converters to connect to the power grid. The interaction between the converter and the power grid is likely to cause sub-synchronous resonance (Sub-synchronous Resonance, SSR) problems, causing unit shutdown and even equipment damage

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  • Prediction method and terminal equipment for subsynchronous resonant frequency of direct-drive wind farms
  • Prediction method and terminal equipment for subsynchronous resonant frequency of direct-drive wind farms
  • Prediction method and terminal equipment for subsynchronous resonant frequency of direct-drive wind farms

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Embodiment Construction

[0039] The present invention provides a method and terminal equipment for predicting the subsynchronous resonant frequency of a direct-drive wind farm. In order to make the purpose, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0040]It will be understood by those skilled in the art that the singular forms "a", "an", "the" and "the" as used herein can include the plural forms as well, unless expressly stated otherwise. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of stated features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of on...

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Abstract

The invention discloses a method and terminal equipment for predicting the subsynchronous resonance frequency of a direct-drive wind farm. The method includes collecting the output signal of the grid-side converter of the wind farm system, and establishing the grid-side converter according to the output signal and the relationship between internal physical quantities. converter model, phase-locked loop model and grid-side converter controller model; establish subsynchronous resonance prediction model based on grid-side converter model, phase-locked loop model and grid-side converter controller model; The frequency prediction model predicts the resonant frequency point and adjusts the wind farm system according to the resonant frequency point to suppress subsynchronous resonance. The present invention utilizes the subsynchronous resonance prediction model established by the state space equation, and predicts the resonance frequency of the wind farm system through the subsynchronous resonance prediction model, predicts the resonance frequency point according to the resonance frequency, and adds in advance in the system according to the resonance frequency point. Protective measures to avoid subsynchronous resonance and ensure the continuous safe and stable operation of the system.

Description

technical field [0001] The invention relates to the technical field of wind farms, in particular to a method and terminal equipment for predicting the subsynchronous resonance frequency of a direct-drive wind farm. Background technique [0002] In recent years, as large-scale new energy power generation clusters dominated by wind power are widely connected to the AC power grid, new challenges have been brought to the safe and stable operation of the power system. Different from traditional power generation equipment, new energy generator sets mostly use power electronic converters to connect to the power grid. The interaction between the converter and the power grid can easily lead to Sub-synchronous Resonance (SSR) problems, resulting in unit shutdown and even equipment damage. SUMMARY OF THE INVENTION [0003] The technical problem to be solved by the present invention is to provide a method and terminal device for predicting the subsynchronous resonance frequency of a d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/38H02J3/24
CPCY02E10/76
Inventor 王芸陶国清吴燕平陈宇
Owner SHENZHEN UNIV
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