Harmonic analysis method for offshore wind farm

A wind farm and resonance technology, applied in the field of offshore wind farm resonance analysis

Inactive Publication Date: 2016-12-21
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to propose a resonance analysis method for offshore wind farms aiming at the deficiencies of current offshore wind farm resonance analysis methods

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  • Harmonic analysis method for offshore wind farm
  • Harmonic analysis method for offshore wind farm
  • Harmonic analysis method for offshore wind farm

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Embodiment

[0150] 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.

[0151] 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.

[0152] 1. Solve the system resonance impedance spectrum in the initial state, and compare the performance under different topologies

[0153] Solve the resonant impedance spectrum of the system under the chain t...

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Abstract

The invention discloses a harmonic modal analysis method for an offshore wind farm. The method comprises the steps of 1) building a system harmonic model according to an offshore wind farm system, namely a connection relationship between each component and a cable; 2) establishing a network admittance matrix of the system according to the system harmonic model, solving a modal impedance frequency spectrum of the system by utilizing a modal method, calculating a participation factor of each node, and determining a real occurrence position of harmonic vibration; 3) assessing the sensitivity of electric parameters of components of the system; and 4) assessing the sensitivity of design parameters of the system. According to the method, an equivalent model is built according to the parameter of each component of the wind farm, the harmonic performance of the system under different topological parameters, cable parameters, transformer parameters and other parameters is studied by applying the modal analysis method, and the topological design and component model selection of the wind farm can be optimized.

Description

technical field [0001] The present invention relates to offshore wind farms, in particular to a resonance analysis method for offshore wind farms. Specifically, the harmonic model of the offshore wind farm system is established, and the global resonance point of the system and the participation degree of each node are calculated using the modal method, thereby determining Where the resonance actually occurs. At the same time, sensitivity analysis is used to evaluate the impact of changes in parameters such as topology and cable length on the degree of resonance. 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. As of June 2012, the global installed capacity of offshore wind power has reached 4620MW, accounting for about 2% of the total installed capacity of wind power. With t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367Y02E60/00
Inventor 冯琳段庚勇李国杰江秀臣
Owner SHANGHAI JIAO TONG UNIV
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