High step-up high efficiency dc-dc converter for module-integrated photovoltaic applications

A novel high step-up high efficiency DC-DC converter for photovoltaic energy conversion is presented in this paper. The proposed converter employs a coupled inductor and two voltage multiplier cells to achieve high step-up voltage gain. The operating principle and the steady-state analyses of voltage gain are described in detail. A 200 W prototype with 20-30 V input and 400 V output voltages is built to verify the analysis. The maximum efficiency of the prototype is nearly 97.7% and the efficiency is higher than 97% over a wide load range.

[1]  Yehui Han,et al.  PV balancers: Concept, architectures, and realization , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[2]  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.

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

[4]  Robert S. Balog,et al.  Microinverter and string inverter grid-connected photovoltaic system — A comprehensive study , 2013, 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC).

[5]  René P. Torrico-Bascope,et al.  Highly Efficient High Step-Up Converter for Fuel-Cell Power Processing Based on Three-State Commutation Cell , 2010, IEEE Transactions on Industrial Electronics.

[6]  T. Friedli,et al.  Classification and comparative evaluation of PV panel integrated DC-DC converter concepts , 2014, 2012 15th International Power Electronics and Motion Control Conference (EPE/PEMC).

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

[8]  Bin Gu,et al.  Hybrid Transformer ZVS/ZCS DC–DC Converter With Optimized Magnetics and Improved Power Devices Utilization for Photovoltaic Module Applications , 2015, IEEE Transactions on Power Electronics.

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