US 11,817,712 B2
High-low voltage continuous ride-through control method and system for permanent magnet direct-drive wind power generating set
Yuanyan Huang, Beijing (CN); Jie Zhou, Beijing (CN); Shaohua Zhang, Beijing (CN); and Xin Chen, Beijing (CN)
Assigned to XINJIANG GOLDWIND SCIENCE & TECHNOLOGY CO., LTD., Urumqi (CN)
Appl. No. 17/757,293
Filed by XINJIANG GOLDWIND SCIENCE & TECHNOLOGY CO., LTD., Urumqi (CN)
PCT Filed Jun. 8, 2020, PCT No. PCT/CN2020/094909
§ 371(c)(1), (2) Date Jun. 13, 2022,
PCT Pub. No. WO2021/114588, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 201911279371.7 (CN), filed on Dec. 13, 2019.
Prior Publication US 2023/0022678 A1, Jan. 26, 2023
Int. Cl. H02J 3/00 (2006.01); H02J 3/38 (2006.01)
CPC H02J 3/381 (2013.01) [H02J 2300/28 (2020.01)] 18 Claims
OG exemplary drawing
 
1. A method for controlling continuous low voltage ride-through and high voltage ride-through of a permanent magnet direct-driven wind turbine, comprising:
monitoring a voltage at a point of common coupling of a wind farm, wherein the wind turbine experiences a low voltage ride-through state in a first time period from a first time point to a second time point and a high voltage ride-through state in a second time period from a third time point to a fourth time point, wherein the wind turbine provides an active current at a first level before the first time point and a second level during the first time period from the first time point to the second time point, wherein the second level is lower than the first level;
determining a transient time period from the second time point to the third time point during which the wind turbine is transitioned from the low voltage ride-through state to the high voltage ride-through state;
controlling the wind turbine to provide, during the transient time period, the active current to the point of common coupling, the active current being gradually increasing from;
controlling the wind turbine to provide, during the transient time period, a reactive current to the point of common coupling according to an operation state of the wind turbine before the low voltage ride-through state; and
controlling the wind turbine to increase, at the third time point which is the end of the transient time period, the active current to a third level which is higher than the second level during the first time period but lower than a the first level before the first time point wherein the wind turbine provides the active current at the third level during the second time period from the third time point to the fourth time point.