US 12,422,875 B2
String optima for tracking equal voltage in units of strings, and solar power generation system to which same is applied
Ki Ju Park, Seoul (KR); Kyung Mun Lee, Busan (KR); and Sae Hee Park, Seoul (KR)
Assigned to SMART POWER CO., LTD., Gimpo-si (KR); and Ki Ju Park, Seoul (KR)
Appl. No. 18/269,580
Filed by SMART POWER CO., LTD., Gimpo-si (KR); and Ki Ju Park, Seoul (KR)
PCT Filed Dec. 24, 2021, PCT No. PCT/KR2021/019882
§ 371(c)(1), (2) Date Jun. 26, 2023,
PCT Pub. No. WO2022/145907, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 10-2020-0189458 (KR), filed on Dec. 31, 2020; and application No. 10-2021-0157971 (KR), filed on Nov. 16, 2021.
Prior Publication US 2024/0053786 A1, Feb. 15, 2024
Int. Cl. G05F 1/67 (2006.01); H02J 3/38 (2006.01); H02S 40/32 (2014.01)
CPC G05F 1/67 (2013.01) [H02J 3/381 (2013.01); H02S 40/32 (2014.12); H02J 2300/26 (2020.01)] 17 Claims
OG exemplary drawing
 
1. A string optimizer connected between an inverter and an output terminal of each of a plurality of solar cell strings included in a photovoltaic power generation system to output an equal voltage, the string optimizer comprising:
an input processor configured to receive input of generated power from any first solar cell string;
a booster configured to boost or bypass generated power input through the input processor, and output the generated power;
an output processor configured to output an output of the booster to a back end; and
a main controller unit (MCU) configured to perform maximum power point tracking (MPPT) in units of strings to control an operation of the booster so that a voltage corresponding to a maximum current value among current values each detected from an output of each of the plurality of solar cell strings tracks the equal voltage.