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Variable-speed constant-frequency wind power generation system of alternative-current excitation double-feed generator

A technology of wind power generation system and doubly-fed generator, applied in the direction of control generator, wind energy power generation, control system, etc., can solve the problems of errors and uncertain factors, and achieve the effect of good power quality

Inactive Publication Date: 2012-05-02
XIAN RUIJINYUAN ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in wind power systems with large random disturbances, many uncertain factors, and severe nonlinearity, traditional control methods will produce large errors

Method used

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  • Variable-speed constant-frequency wind power generation system of alternative-current excitation double-feed generator
  • Variable-speed constant-frequency wind power generation system of alternative-current excitation double-feed generator

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Embodiment Construction

[0011] The following will combine figure 1 The present invention is further described. But the content of the present invention is not limited thereto.

[0012] see figure 1 , an AC excitation double-fed generator variable-speed constant-frequency wind power generation system according to the present invention, the control system includes a generator, a generator-side converter, a DC link, a grid-side converter, and a transformer.

[0013] The variable speed and constant frequency control scheme is realized in the rotor circuit, and the power flowing through the rotor circuit is the slip power determined by the operating range of the AC excitation generator, which is only a small part of the rated power of the stator .

[0014] The capacity of the bidirectional frequency converter is only a fraction of that of the generator.

[0015] The specific control content of the control system includes: when the change of wind speed causes the change of generator speed n, the freque...

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Abstract

The invention relates to a variable-speed constant-frequency wind power generation system of an alternative-current excitation double-feed generator, and is characterized by comprising a control system generator, a generator side converter, a direct-current link, a net side converter and a transformer. According to the invention, the variable-speed constant-frequency wind power generation system has the advantages that: the wind energy can be captured to the greatest extent and a rotating speed operation range is wider, so that the variable-speed constant-frequency wind power generation system is adapted to the change of the rotating speed of a wind machine, which is caused by the change of an air speed; and a good power quality is provided.

Description

technical field [0001] The invention relates to wind power generation, in particular to a structure of an AC excitation double-fed generator variable-speed constant-frequency wind power generation system. Background technique [0002] The control technology and servo transmission technology in the wind power generation system are the key technologies. This is because the size and direction of the natural wind speed change randomly. Detection and protection against wind and faults during operation must be able to be automatically controlled. At the same time, areas rich in wind resources are usually remote areas or offshore, and scattered wind turbines usually require unattended operation and remote monitoring, which poses challenges to the automation and reliability of the control system of wind turbines. Very demanding. [0003] Due to the unsatisfactory effect of variable-pitch wind turbines operating below the rated wind speed, various variable-speed wind turbines based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02P9/04
CPCY02E10/763Y02E10/76
Inventor 雷威王立群
Owner XIAN RUIJINYUAN ENERGY TECH