US 12,237,683 B2
Photovoltaic rapid shutdown system and control method therefor
Qiaodi Chen, Hefei (CN); Yu Yang, Hefei (CN); and Jun Xu, Hefei (CN)
Assigned to Sungrow Power Supply Co., Ltd., Hefei (CN)
Appl. No. 18/279,141
Filed by Sungrow Power Supply Co., Ltd., Hefei (CN)
PCT Filed Mar. 3, 2022, PCT No. PCT/CN2022/078966
§ 371(c)(1), (2) Date Aug. 28, 2023,
PCT Pub. No. WO2022/199345, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 202110307926.5 (CN), filed on Mar. 23, 2021.
Prior Publication US 2024/0146067 A1, May 2, 2024
Int. Cl. H02J 3/38 (2006.01); H02J 3/00 (2006.01); H02J 3/01 (2006.01)
CPC H02J 3/38 (2013.01) [H02J 3/001 (2020.01); H02J 3/01 (2013.01); H02J 2300/26 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A method for controlling a rapid shutdown system, comprising:
determining whether a starting condition is met, by an inverter in the rapid shutdown system;
starting the inverter if it is determined that the starting condition is already met, and applying a disturbance to a direct-current side of the inverter by the inverter if it is determined that the starting condition is not met;
determining whether an electrical signal at an output end of a shutdown device in the rapid shutdown system meets a preset condition, by the shutdown device; and
switching the shutdown device on or maintaining the shutdown device in an ON state if it is determined that the electrical signal already meets the preset condition, and switching the shutdown device off or maintaining the shutdown device in an OFF state if it is determined that the electrical signal does not meet the preset condition.