US 12,088,105 B2
Power derating method for photovoltaic tracking system, controller, and photovoltaic tracking system
Zongjun Yang, Hefei (CN); Shaokun Zou, Hefei (CN); Yanhu Zhang, Hefei (CN); and Xiaoguang Li, Hefei (CN)
Assigned to Sungrow Renewables Development Co., Ltd., Hefei (CN)
Filed by Sungrow Renewables Development Co., Ltd., Hefei (CN)
Filed on Mar. 4, 2022, as Appl. No. 17/687,541.
Claims priority of application No. 202110260494.7 (CN), filed on Mar. 10, 2021.
Prior Publication US 2022/0294227 A1, Sep. 15, 2022
Int. Cl. H02J 3/38 (2006.01); H02S 20/32 (2014.01)
CPC H02J 3/381 (2013.01) [H02S 20/32 (2014.12); H02J 2300/26 (2020.01)] 18 Claims
OG exemplary drawing
 
1. A power derating method for a photovoltaic tracking system, wherein the method is applied to a controller of the photovoltaic tracking system, and the method comprises:
acquiring a current operating power and a target derating power of a photovoltaic inverter:
calculating a total power derating amount based on the current operating power and the target derating power;
determining a target derating amount by a photovoltaic tracker based on the total power derating amount and a preset derating amount distribution coefficient;
determining a target tracking angle based on the target power derating amount, and controlling the photovoltaic tracker to adjust a photovoltaic module to be at the target tracking angle and fix the photovoltaic module; and
controlling the photovoltaic inverter to adjust a direct current operating voltage based on a difference between the total power derating amount and the target power derating amount.