US 12,149,087 B1
Power conversion device and maximum power point tracking control method
Chongfeng Zheng, Wenzhou (CN); and Jian Peng, Wenzhou (CN)
Assigned to Foxess Co., Ltd., Wenzhou (CN)
Filed by FOXESS CO., LTD, Wenzhou (CN)
Filed on May 7, 2024, as Appl. No. 18/657,729.
Claims priority of application No. 202310705818.2 (CN), filed on Jun. 15, 2023.
Int. Cl. H02J 3/38 (2006.01); H02M 1/00 (2006.01); H02M 3/00 (2006.01); H02M 3/335 (2006.01); H02M 7/537 (2006.01)
CPC H02J 3/38 (2013.01) [H02M 1/0009 (2021.05); H02M 1/0067 (2021.05); H02M 3/003 (2021.05); H02M 3/335 (2013.01); H02M 7/537 (2013.01); H02J 2300/26 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A power conversion device for a photovoltaic system, comprising:
a boost isolation DC/DC converter including a transformer, wherein an input terminal of the boost isolation DC/DC converter is connected to a photovoltaic component, and an output terminal of the boost isolation DC/DC converter is connected to a DC bus; and
a controller configured to receive a bus voltage of the DC bus and a bus output current output by the boost isolation DC/DC converter, and output, based on the bus voltage and the bus output current output by the boost isolation DC/DC converter, a switch control signal that controls the boost isolation DC/DC converter to perform maximum power point tracking control of the photovoltaic component, the controller comprising:
a first multiplication module multiplying the bus voltage and the bus output current of the boost isolation DC/DC converter to obtain a current output power of the boost isolation DC/DC converter;
a maximum power point tracking control module obtaining a rated current variation coefficient of the boost isolation DC/DC converter based on a difference between the current output power of the boost isolation DC/DC converter and an output power of the boost isolation DC/DC converter at a previous moment;
a second multiplication module multiplying the rated current variation coefficient of the boost isolation DC/DC converter and a rated current of the boost isolation DC/DC converter to obtain a bus output current reference value of the boost isolation DC/DC converter;
a first subtraction module performing a subtraction operation on the bus output current reference value of the boost isolation DC/DC converter and the bus output current of the boost isolation DC/DC converter to obtain a bus output current difference of the boost isolation DC/DC converter; and
a first operation unit outputting the switch control signal for controlling the boost isolation DC/DC converter based on the bus output current difference of the boost isolation DC/DC converter.