Design optimization of a high step-Up DC-DC converter for photovoltaic microinverters

A design optimization of a generalized high step-up dc-dc converter applied as front-stage in a photovoltaic (PV) microinverter is proposed. The design methodology optimizes the weighted California Energy Commission (CEC) efficiency of the generalized converter considering not only the classical parameters, as turns ratio and switching frequency, but also the topology structure through different connections of voltage multiplier cells. Two design optimizations have been carried out. The first maximizes only the CEC efficiency, obtaining results around 98%. In the second it was added terms related to cost and volume in the objective function, which results in a converter with lower CEC efficiencies — around 96% — but with a higher power density and lower cost.

[1]  Roberto F. Coelho,et al.  Generalized High Step-Up DC-DC Boost-Based Converter With Gain Cell , 2017, IEEE Transactions on Circuits and Systems I: Regular Papers.

[2]  Jiann-Fuh Chen,et al.  A Novel High Step-Up DC–DC Converter for a Microgrid System , 2011, IEEE Transactions on Power Electronics.

[3]  Wuhua Li,et al.  High step-up boost converter with coupled inductor and switched capacitor , 2010 .

[4]  Jiann-Fuh Chen,et al.  Novel High Step-Up DC–DC Converter With Coupled-Inductor and Switched-Capacitor Techniques for a Sustainable Energy System , 2011, IEEE Transactions on Power Electronics.

[5]  Y. Berkovich,et al.  High step-up DC-DC converter based on the switched-coupled-inductor boost converter and diode-capacitor multiplier , 2012 .

[6]  Wuhua Li,et al.  Review of Nonisolated High-Step-Up DC/DC Converters in Photovoltaic Grid-Connected Applications , 2011, IEEE Transactions on Industrial Electronics.

[7]  Haibing Hu,et al.  A Review of Power Decoupling Techniques for Microinverters With Three Different Decoupling Capacitor Locations in PV Systems , 2013, IEEE Transactions on Power Electronics.

[8]  Jiann-Fuh Chen,et al.  Novel High Step-Up DC–DC Converter for Distributed Generation System , 2013, IEEE Transactions on Industrial Electronics.

[9]  J. W. Kolar,et al.  Loss modeling of inductive components employed in power electronic systems , 2011, 8th International Conference on Power Electronics - ECCE Asia.

[10]  Z.J. Shen,et al.  New Physical Insights on Power MOSFET Switching Losses , 2009, IEEE Transactions on Power Electronics.

[11]  Tsorng-Juu Liang,et al.  Novel high-efficiency step-up converter , 2004 .

[12]  Fred C. Lee,et al.  High-efficiency, high step-up DC-DC converters , 2003 .

[13]  Charles R. Sullivan,et al.  An improved calculation of proximity-effect loss in high-frequency windings of round conductors , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[14]  E. Tatakis,et al.  Weighted Efficiency Optimization of Flyback Microinverter Under Improved Boundary Conduction Mode (i-BCM) , 2015, IEEE Transactions on Power Electronics.

[15]  Marian P. Kazmierkowski.  Inductors and Transformers for Power Electronics , 2008 .

[16]  Adrian Ioinovici,et al.  Ultra-Large Gain Step-Up Switched-Capacitor DC-DC Converter With Coupled Inductor for Alternative Sources of Energy , 2012, IEEE Transactions on Circuits and Systems I: Regular Papers.

[17]  Jiann-Fuh Chen,et al.  Novel High Step-Up DC–DC Converter With Coupled-Inductor and Switched-Capacitor Techniques , 2012, IEEE Transactions on Industrial Electronics.

[18]  A. Van den Bossche,et al.  Measurement and loss model of ferrites with non-sinusoidal waveforms , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).