Reconfigure topology and control strategy of distribute photovoltaic array

JIANG Jian-dong， HUA Jing-hua， LI Lu-xia
（Key Laboratory of E&M， Ministry of Education & Zhejiang Province， Zhejiang University of Technology，
Hangzhou 310014， China）

Abstract： Aiming at one problem that the ideal P-V characteristic of partial-shaded photovoltaic array are modified and multi-peaks power output happened，so that common maximum power point tracking（MPPT） algorithms are failed，and the other problem that rated power of inverters are not match the output of pthtovoltaic array on actual low light intensity working condition，a new inverter output scheme and a free reconfigurable switching topology were presented，mathematical model of photovoltaic array connection and constrains were analyzed. Dynamic clustering was used to control the topology to optimize the connection of pthotvoltaic array.The mathematical model of photovoltaic array and inverters were developed in Matlab，reconfiguration process was simulated and series-parallel switch matrix was given under partial-shaded and low light intensity condition. The results indicate that reconfigure topology can improve the efficiency of distribute photovoltaic array greatly.
Key words： photovoltaic； partial shading； low light intensity； energy optimization； reconfigure topology； maximum power point tracking（MPPT）