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Soft-switching flyback inverter with enhanced power decoupling for photovoltaic applications

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3 Author(s)
Tan, G.H. ; Dept. of Electr. Eng., Harbin Inst. of Technol. ; Wang, J.Z. ; Ji, Y.C.

A novel single-phase flyback inverter for photovoltaic applications is proposed to achieve low-frequency ripple current reduction on the DC busbar and to draw sinusoidal current into the AC grid. Based on capacitive idling techniques, the proposed circuit topology is derived from a single-ended primary-inductance converter and two-switch flyback inverter to obtain soft-switching operation for all of the active switches. Compared with a buck-boost inverter and other flyback inverter topologies for AC photovoltaic module systems, no extra active switches are used in the proposed inverter to realise both soft-switching and enhanced power decoupling with only four active switches. Peak-current mode control method is employed in the control schemes to ensure pure sinusoidal current with unity power factor on the AC grid. Laboratory experimental results based on a 500 W prototype are provided to verify the effectiveness of the proposed inverter

Published in:

Electric Power Applications, IET  (Volume:1 ,  Issue: 2 )

Date of Publication:

March 2007

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