US 11,728,769 B2
Fault detection apparatus and method, and grid-tied photovoltaic power generation system
Yongbing Gao, Shanghai (CN); Yunyu Tang, Shanghai (CN); and Lei Shi, Shanghai (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Feb. 16, 2022, as Appl. No. 17/673,140.
Claims priority of application No. 202110199883.3 (CN), filed on Feb. 22, 2021.
Prior Publication US 2022/0271712 A1, Aug. 25, 2022
Int. Cl. H02S 40/32 (2014.01); H02J 3/00 (2006.01); H02S 50/10 (2014.01)
CPC H02S 50/10 (2014.12) [H02J 3/001 (2020.01); H02S 40/32 (2014.12)] 15 Claims
OG exemplary drawing
 
1. A fault detection apparatus, comprising
a temperature detection unit;
a current detection unit; and
a controller,
wherein the temperature detection unit is coupled to a plurality of filter capacitors between an output end of a grid-tied inverter and a grid, and is configured to detect temperatures of the plurality of filter capacitors, and output the temperatures to the controller;
wherein the current detection unit is coupled to the plurality of filter capacitors, and is configured to detect currents of the plurality of filter capacitors, and output the currents to the controller; and
wherein the controller is separately connected to the temperature detection unit and the current detection unit, and is configured to:
determine whether the received temperature has exceeded a first threshold and whether the received current has exceeded a second threshold, and determine whether the first threshold and second threshold are met simultaneously;
in a case where only one of the first threshold and second threshold is met, maintain a connection between the output end of the grid-tied inverter and the plurality of filter capacitors; and
in a case where the first threshold and second threshold are met simultaneously, disconnect the output end of the grid-tied inverter from the plurality of filter capacitors.