US 12,113,356 B2
Photovoltaic power generation system and method for controlling power balance
Jiacai Zhuang, Hefei (CN); Wei Liu, Anhui (CN); and Jun Xu, Anhui (CN)
Assigned to Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed by Sungrow Power Supply Co., Ltd., Hefei (CN)
Filed on Mar. 24, 2022, as Appl. No. 17/703,742.
Claims priority of application No. 202110565248.2 (CN), filed on May 24, 2021.
Prior Publication US 2022/0376497 A1, Nov. 24, 2022
Int. Cl. H02J 1/00 (2006.01); H02J 1/10 (2006.01); H02J 1/12 (2006.01); H02S 40/30 (2014.01)
CPC H02J 1/106 (2020.01) [H02J 1/12 (2013.01); H02S 40/30 (2014.12); H02J 2300/24 (2020.01)] 11 Claims
OG exemplary drawing
 
1. A photovoltaic power generation system, comprising at least two photovoltaic arrays, at least one power balance circuit, and a power converter, wherein
each of the photovoltaic arrays comprises at least two photovoltaic strings connected in parallel;
each of two input ports of the power balance circuit is connected to at least one photovoltaic array, wherein the two input ports of the power balance circuit are connected to different photovoltaic arrays;
an output port of the power balance circuit is connected to the power converter;
the power balance circuit is configured to, in response to determining that a mismatching degree of the photovoltaic arrays respectively connected to the two input ports exceeds an allowable range, perform power transfer based on a difference between output powers of the photovoltaic arrays connected to the power balance circuit to control a difference between powers of two output terminals of the power balance circuit to be within a preset range.