Title :
Multi-mode control for photovoltaic grid-connected interleaved flyback micro-inverters to achieve high efficiency in wide load range
Author :
Zhang, Zhiliang ; He, Xiao-Fei ; Ren, Xiaoyong ; Li, Xin ; Liu, Yan-Fei
Author_Institution :
Jiangsu Key Lab. of New Energy Generation & Power Conversion, Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China
Abstract :
Boundary Conduction Mode (BCM) and Discontinuous Conduction Mode (DCM) control strategies are widely used for the flyback micro-inverter. BCM and DCM control strategies are investigated for the interleaved flyback micro-inverter concentrating on the loss analysis under different load condition. These two control strategies have different impact on the loss distribution and thus the efficiency of the flyback micro-inverter. Based on the loss analysis, a new hybrid control strategy combing the two-phase DCM and one-phase DCM control is proposed to improve the efficiency in wide load range by reducing the dominant losses depending on the load current. The experimental results verified the benefits of the proposed control.
Keywords :
invertors; losses; phase control; photovoltaic power systems; power generation control; power grids; sampled data systems; BCM; boundary conduction mode; discontinuous conduction mode; hybrid control strategy; interleaved flyback microinverter concentration; load current; loss distribution analysis; multimode control; one-phase DCM control; photovoltaic grid-connection; two-phase DCM control; Copper; Inverters; Logic gates; MOSFETs; Power generation; Voltage control; Windings; grid-connected; interleaved flyback; micro-inverter;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2012 IEEE
Conference_Location :
Raleigh, NC
Print_ISBN :
978-1-4673-0802-1
Electronic_ISBN :
978-1-4673-0801-4
DOI :
10.1109/ECCE.2012.6342551
