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Prediction method for sub-synchronous resonance frequency of direct-drive wind farm and terminal device

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

Active Publication Date: 2019-06-14
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 for sub-synchronous resonance frequency of direct-drive wind farm and terminal device
  • Prediction method for sub-synchronous resonance frequency of direct-drive wind farm and terminal device
  • Prediction method for sub-synchronous resonance frequency of direct-drive wind farm and terminal device

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Embodiment Construction

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

[0040]Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integ...

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Abstract

The invention discloses a prediction method for the sub-synchronous resonance frequency of a direct-drive wind farm and a terminal device. The method comprises the following steps: an output signal ofa network-side converter of a wind farm system is collected; a network-side converter model, a phase-locked loop model and a network-side converter controller model are established according to the output signal and the internal physical quantity relationship. According to the grid-side converter model, the phase-locked loop model and the grid-side converter controller model, the sub-synchronousresonance prediction model is established. According to the sub-synchronous resonance frequency prediction model, the resonance frequency point is predicted, and the wind farm system is adjusted according to the resonance frequency point to suppress the sub-synchronous resonance. The invention utilizes the sub-synchronous resonance prediction model established by the state space equation, the resonance frequency of the wind farm system is predicted by the sub-synchronous resonance prediction model, and the resonance frequency point is predicted according to the resonance frequency point, and protection measures are added in the system according to the resonance frequency point in advance to avoid the occurrence of sub-synchronous 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 direct-drive wind farms. 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 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. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method and terminal equipment for predicting the subsynchronous ...

Claims

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Application Information

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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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