US 12,483,189 B2
MLPE photovoltaic system and MLPE device detection method thereof
Yu Yang, Hefei (CN); Xinyu Wang, Hefei (CN); Jun Xu, Hefei (CN); and Qiaodi Chen, Hefei (CN)
Assigned to Sungrow Power Supply Co., Ltd., Hefei (CN)
Appl. No. 18/281,945
Filed by Sungrow Power Supply Co., Ltd., Hefei (CN)
PCT Filed Dec. 15, 2021, PCT No. PCT/CN2021/138256
§ 371(c)(1), (2) Date Sep. 13, 2023,
PCT Pub. No. WO2022/222507, PCT Pub. Date Oct. 27, 2022.
Claims priority of application No. 202110417941.5 (CN), filed on Apr. 19, 2021.
Prior Publication US 2024/0154424 A1, May 9, 2024
Int. Cl. H02S 50/10 (2014.01); H02J 3/38 (2006.01)
CPC H02S 50/10 (2014.12) [H02J 3/381 (2013.01); H02J 2300/24 (2020.01); Y02E 10/56 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A Module-Level Power Electronics (MLPE) device detection method for an MLPE photovoltaic system, wherein
the MLPE photovoltaic system comprises a plurality of MLPE devices each connected to a respective bus corresponding to the respective MLPE device via a respective output terminal, and each of the MLPE devices is configured with a positioning number; and
the MLPE device detection method comprises at least one detection process for a selected number of MLPE devices connected to a same corresponding bus, and the at least one detection process comprises:
controlling the selected number of MLPE devices to perform operation state switching simultaneously, and acquiring an operation feature of the bus corresponding to the selected number of MLPE devices before the operation state switching and an operation feature of the bus corresponding to the selected number of MLPE devices after the operation state switching;
determining whether a change, between the operation feature of the bus corresponding to the selected number of MLPE devices before the operation state switching and the operation feature of the bus corresponding to the selected number of MLPE devices after the operation state switching, meets a predetermined change condition; and
determining, in a case that the change does not meet the predetermined change condition, that the selected number of MLPE devices with respective positioning numbers includes at least one MLPE device operating in an abnormal state;
wherein the plurality of MLPE devices includes a first group of MLPE devices connected to the same corresponding bus, and the MLPE detection method further comprises:
performing a first troubleshooting process comprising performing the detection process for the first group of MLPE devices connected to the same bus, and
in response to determining the first group of MLPE devices connected to the same bus includes at least one MLPE device operating in the abnormal state, performing at least one subsequent troubleshooting process comprising performing the detection process for a smaller subset of the first group of MLPE devices.