US 12,444,925 B2
Photovoltaic system, inverter, and direct current electric arc detection method
Yongquan Liu, Xi'an (CN); Guilei Gu, Shanghai (CN); Gang Xiao, Xi'an (CN); and Dili Zhu, Xi'an (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Sep. 8, 2022, as Appl. No. 17/940,191.
Claims priority of application No. 202111056652.3 (CN), filed on Sep. 9, 2021.
Prior Publication US 2023/0071656 A1, Mar. 9, 2023
Int. Cl. H02H 7/122 (2006.01); H02S 40/32 (2014.01); H02S 50/10 (2014.01)
CPC H02H 7/1227 (2013.01) [H02S 40/32 (2014.12); H02S 50/10 (2014.12)] 14 Claims
OG exemplary drawing
 
1. A photovoltaic system; comprising
an inverter, wherein an input terminal of the inverter is configured to connect to at least one photovoltaic string, each photovoltaic string of the at least one photovoltaic string comprises at least one converter and a photovoltaic module corresponding to each respective converter, and an input terminal of each respective converter is connected to the corresponding photovoltaic module; and
a controller, wherein the controller is configured to:
when the electric arc is detected in the photovoltaic system, control an input current of the inverter to decrease to extinguish the electric arc;
after the electric arc is extinguished, control an output voltage of the at least one photovoltaic string to decrease to a first preset voltage, wherein the first preset voltage is less than an input voltage of the inverter when the electric arc is detected; and
after controlling the output voltage of the at least one photovoltaic string to decrease to the first preset voltage, increase the input current of the inverter to the input current of the inverter when the electric arc is detected; or
after the electric arc is extinguished, control a maximum value of an output current of the at least one photovoltaic string to be a first preset current, wherein the first preset current is less than the input current of the inverter when the electric arc is detected; and
after controlling the maximum value of the output current of the at least one photovoltaic string to be the first preset current, decrease the input voltage of the inverter to the input voltage of the inverter when the electric arc is detected.