Direct-drive wind power system for wind power plant

A wind power system and direct drive technology, applied in wind power generation, high-efficiency power electronic conversion, electrical components, etc., can solve problems such as unstable active output of wind farms and affecting the voltage stability of bus nodes in the power grid

Inactive Publication Date: 2013-09-04
LANZHOU JIAOTONG UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to use a direct-drive wind power system for wind farms, aiming to solve the problem that the wind speed chan

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  • Direct-drive wind power system for wind power plant

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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0039] An embodiment of the present invention provides a direct-drive wind power system for a wind farm. The direct-drive wind power system for a wind farm includes:

[0040] Stand-alone infinite system, used to amplify the signal;

[0041] The reactive power control system of the grid-side inverter is connected with the single-unit infinite system to control the entire grid.

[0042] As an optimization scheme of the embodiment of the present invention, the stand-alone infinite system also includes:

[0043] Wind turbines, used to provide voltage signals;

[0044] The equivalent circuit is conne...

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Abstract

The invention discloses a direct-drive wind power system for a wind power plant. The direct-drive wind power system for the wind power plant comprises a single-machine infinite bus system and a grid side inverter reactive power control system. According to the direct-drive wind power system, a power-voltage curve method is used for analyzing the static voltage stability of the wind power plant, and own characteristics of a permanent magnet direct-drive machine unit are combined to control reactive power conversion between the machine unit and a power grid according to the voltage changes of the power grid through a full-power converter, so that the voltage stability of the whole wind power plant is improved; the single-machine infinite bus system is used for analyzing a voltage instability mechanism, and performing simulation for different factors after the factors which influence the voltage stability of the grid-connected wind power plant are obtained, so that a theoretical basis is added; the power-voltage curve method is used for analyzing the influence of capacity increase of the wind power plant on generatrix voltage in the whole system to obtain a stable running limit of the wind power plant; and in addition, steps are simple, and the system is convenient to operate, and has high application value.

Description

technical field [0001] The invention belongs to the technical field of new energy development, and in particular relates to a direct-drive wind power system for a wind farm. Background technique [0002] Wind energy is a renewable energy source. It is estimated that the theoretical storage capacity of wind energy on the earth is about 2.74×10 9 MW, the wind energy that can be developed and utilized is 2×10 7 MW, as long as 1% of the wind energy on the earth is used, the global energy demand can be met. Since most of the wind farms in my country are located in remote areas and the grid structure is weak, the grid connection of a large number of wind grids has brought great challenges to the power system. Most of the power grid accidents in recent years are caused by voltage instability. In the power grid including wind farms, due to the intermittent wind speed, the output of wind farms is unstable, which has brought great challenges to the stable operation of the power syst...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/16H02M1/42
CPCY02B70/10Y02E10/76Y02E40/30
Inventor 张友鹏李萌赵斌董海燕肖蒙郭瑾叶爱贤
Owner LANZHOU JIAOTONG UNIV
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