Design of Boost Converter Based on Optimum Weighted Average Efficiency for Photovoltaic Systems
DOI:
https://doi.org/10.18618/REP.2014.3.295302Keywords:
Boost Converter, Magnetic Core, Operation Point, Power Losses, Weighted Average EfficiencyAbstract
This paper presents different optimum designs of DC/DC boost converters applied to photovoltaic systems (PV). Boost converter is used to track the maximum power of PV systems. The main goal of this work is to select of an operation point for this converter (current ripple @ switching frequency) and choosing the magnetic core and conductor diameter, which provide better efficiency in all load range. The losses in capacitors, semiconductors and magnetics are evaluated for all load range. After that, it is obtained the efficiency in 5%, 10%, 25%, 50%, 75% and 100 % of nominal power in order to calculate the weighted average efficiency, as determined by standard IEC 61683:2000. From this evaluation, the operation point and the magnetic material that will result in the best efficiency are selected. The volume and cost are not considered in this work. Experimental results are presented to validate the obtained simulated results, as well as results of the total efficiency of the boost converter. Four different configurations are presented to prove that the operating point and the magnetic core selected are the best among them. A discussion of the results is presented, where alternatives to improve efficiency throughout the power range are analyzed.
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