Segmented hybrid control method of photovoltaic grid-connected micro-inverter

HUANG Xue-yu，CHEN Guo-ding，HU Meng-jie，YAN Dun

（College of Information Engineering，Zhejiang University of Technology，Hangzhou 310023，China）

Abstract：Aiming at overcome the shortcoming of photovoltaic grid-connected interleaved flyback micro-inverter under the control of the boundary current mode（BCM）and discontinuous current mode（DCM），a segmented hybrid control method was proposed. The work cycle of micro-inverter was segmented under the new control method，and the micro-inverter worked in the single flyback of discontinuous current mode and interleaved flyback of boundary current mode alternately. The principle of the segmented hybrid control method was analyzed and the switching sequence and waveforms of the proposed method were given. The results indicate that the high performances in efficiency and transferred power quantity can be achieved under the segmented hybrid control method，the control method could fit all power levels of the micro-inverter.