论文信息 - A hybrid control method for photovoltaic grid-connected interleaved flyback micro-inverter to achieve high efficiency in wide load range

A hybrid control method for photovoltaic grid-connected interleaved flyback micro-inverter to achieve high efficiency in wide load range

For flyback micro-inverters, Boundary Conduction Mode (BCM) and Discontinuous Conduction Mode (DCM) control strategies are widely used. Loss analysis is investigated for the interleaved flyback micro-inverter under BCM and DCM control strategies under different load condition. The BCM and DCM 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.

[1] Wensong Yu,et al. High efficiency converter with charge pump and coupled inductor for wide input photovoltaic AC module applications , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[2] Quan Li,et al. A Review of the Single Phase Photovoltaic Module Integrated Converter Topologies With Three Different DC Link Configurations , 2008, IEEE Transactions on Power Electronics.

[3] F. Blaabjerg,et al. A review of single-phase grid-connected inverters for photovoltaic modules , 2005, IEEE Transactions on Industry Applications.

[4] Min Chen,et al. An optimal control method for grid-connected photovoltaic micro-inverter to improve the efficiency at light-load condition , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[5] Chung-Yuen Won,et al. Dual mode switching strategy of flyback inverter for photovoltaic AC modules , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.

[6] E.C. Tatakis,et al. Optimum Design of the Current-Source Flyback Inverter for Decentralized Grid-Connected Photovoltaic Systems , 2008, IEEE Transactions on Energy Conversion.

[7] Zhaoming Qian,et al. Research on output current of interleaved-flyback in boundary conduction mode for photovoltaic AC module application , 2011, 2011 IEEE Energy Conversion Congress and Exposition.