公开(公告)号：US20180171976A1

公开(公告)日：2018-06-21

申请号：US15386431

申请日：2016-12-21

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Zhuohui TAN ,  Anthony Michael KLODOWSKI ,  Robert Gregory WAGONER

IPC: F03D7/02 ,  H02P9/00 ,  H02K7/18 ,  F03D9/25

CPC classification number: F03D7/0272 ,  F03D7/0276 ,  F05B2270/327 ,  H02K7/183 ,  H02P9/007 ,  Y02E10/723 ,  Y02E10/725

Abstract: A wind generation system includes a wind turbine for generating mechanical power, a doubly-fed induction generator for converting the mechanical power to electrical power, a converter for converting the electrical power to a desired electrical power for supplying to a power grid, and a transformer through which a stator of the generator is coupled to the power grid. When a measured rotation speed feedback from the rotor of the generator is lower than an original cut-in rotation speed of the rotor, a cut-in rotation speed of the rotor is lowered by determining a DC link voltage margin of the converter, determining a DC link voltage setpoint of the converter based on the determined DC link voltage margin; and controlling the converter based on the determined DC link voltage setpoint; and/or by increasing a turn ratio of the transformer to reduce a grid voltage from the power grid.