Direct-drive asynchronous wind driven generator system

Abstract

The invention discloses a direct-drive asynchronous wind driven generator system. The system comprises a wind driven generator set which comprises a fan impeller, a coupler, a multi-pole asynchronous generator and a reactive power compensation device; the multi-pole asynchronous generator is directly connected with the impeller through the coupler, and the rotating speed of the multi-pole asynchronous generator is consistent with that of the impeller; the reactive power compensation device is used for compensating the power factor of the multi-pole asynchronous generator; the output of the multi-pole asynchronous generator is merged into a current collection bus through a current collection circuit; the current collection bus and the multi-pole asynchronous generator output low-frequency electric energy with the same frequency; a boosting device arranged on the current collection device is used for converting the low-frequency electric energy received from the current collection bus into power-frequency electric energy and controlling the power, the frequency and the voltage of each wind generating set connected into the current collection bus. The overall equipment cost of the wind driven generator system can be reduced, and the operation reliability of the wind driven generator system can be improved; loads and the number of devices at the top of the fan tower can be reduced, and quick protection of the generator is facilitated.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a direct-drive asynchronous wind power generator system. Background technique [0002] At present, large-scale wind farms generally adopt power frequency power collection technology, that is, wind turbines use 50 / 60Hz power frequency generators. Among them, doubly-fed asynchronous generators need to be equipped with mechanical speed-up equipment and rotor converters, permanent magnet direct-drive synchronous generators are equipped with full-power converters, and the generator or full-power converters output 50 / 60Hz AC power after boosting The transformer and the current collection line are collected to the current collection device, and the electric energy is output through further step-up and external transmission lines. [0003] In the wind turbines in the prior art, the equipment on the wind tower includes a fan impeller, a transmission device, and a generator, and the r...

AI Technical Summary

Problems solved by technology

[0005] After research, the inventor found that the current collection method of the direct-drive wind turbine in the prior art has the defect that the protection of the current collection line and the generator set, especially the differential protection, is difficult to configure, resulting in a long protection action time. For large-scale wind turbines detrimental effect

In addition, the rotor of the permanent magnet direct drive fan may have the defect of loss of magnetization, and the cost is relatively high

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