Direct-drive asynchronous wind driven generator system

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 elect