A Resonance Suppression Method for Offshore Wind Farm Based on Modal Calculation

A resonance suppression, wind farm technology, applied in computing, electrical digital data processing, instrumentation, etc.

Active Publication Date: 2019-07-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved in the present invention is to propose a resonance suppression method for offshore wind farms based on modal calculations for the deficiencies of current offshore wind farm resonance analysis methods

Method used

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  • A Resonance Suppression Method for Offshore Wind Farm Based on Modal Calculation
  • A Resonance Suppression Method for Offshore Wind Farm Based on Modal Calculation
  • A Resonance Suppression Method for Offshore Wind Farm Based on Modal Calculation

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Embodiment

[0101] In order to verify the analysis method of the offshore wind farm resonance based on modal analysis proposed in the present invention, the correctness and feasibility of the method of the present invention will be described below using the analysis results of the Danish Horns Rev2 offshore wind farm system.

[0102] The wind farm has a chain topology. Each wind turbine includes a squirrel-cage asynchronous motor, converter, LCL filter and box-type export step-up transformer (0.69 / 35kV). Afterwards, chain topology is used to connect all wind turbines to busbars, pass through step-up transformers (35 / 150kV), and transmit them to the onshore power grid through long-distance cables. All the power transmission lines are submarine cables buried 1m below the seabed.

[0103] 1. Solve the system resonance impedance spectrum in the initial state, and compare the performance under different topologies

[0104] Solve the resonant impedance spectrum of the system under the chain t...

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Abstract

The invention discloses an offshore wind farm resonance inhibiting method based on modal calculation. The method comprises the steps that 1, a system harmonic wave model is established according to a connection relation between an offshore wind farm system, namely, all components and a cable; 2, a network admittance matrix of the system is established according to the system harmonic wave model, the modal impedance frequency spectrum of the system is solved through a modal method, participation factors of all nodes are calculated, and the true generation position of resonance is determined; 3, inhibiting measures for the resonance are designed according to the participation factors. According to the method, the installing position of a filter is determined according to the participation factors, and compared with the traditional method that the filter is only installed at a confluence point, harmonic waves transmitted in a wind field can be better inhibited.

Description

technical field [0001] The present invention relates to offshore wind farms, in particular to a method for suppressing resonance in offshore wind farms based on modal calculations, specifically to establish a harmonic model of the offshore wind farm system, and use the modal method to calculate the global resonance point of the system and each node's Participation degree, so as to determine the real occurrence position of resonance, and then design resonance suppression measures according to the participation factor. Background technique [0002] Offshore wind energy resources are abundant, the power generation capacity is large, and land land is not occupied. Offshore wind power generation has become an important development direction in the field of wind power. With the rapid development of offshore wind power, the harmonics generated by offshore wind power grid integration will pose a certain threat to the security and stability of the power grid system. A large number o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG16Z99/00
Inventor 冯琳段庚勇李国杰江秀臣
Owner SHANGHAI JIAO TONG UNIV
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