Design and Implementation of a DC/AC Converter with High Step up and High Efficiency in Wide Output Power Range for Photovoltaic Applications

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Babaee Zarch, Mohammad Javad | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43266 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Zolghardi, Mohammad Reza
Abstract:
Solar power is expensive, so engineers are encouraged to put effort on increasing efficiency of solar power equipments. Since photovoltaic panels usually output a low voltage, variable direct current electricity, a boost converter and a suitable inverter are required to use this energy for ordinary commercial appliances. In this project, high step up, high efficiency converters are investigated, and the best converter with high efficiency and limited switch stress which achieves high voltage gain by capacitor multipliers and coupled inductors is illustrated. Afterwards, methods for improving efficiency such as modifying the converter structure and its control strategy are suggested. The control strategy of the converter is changed in low output power to keep the converter high efficient in a wide output power range. Subsequently the efficiency improvement is verified by Spice simulation results using the accurate spice models of power elements provided by their manufacturer. Next, high efficiency solar inverters are studied and the single phase H6 structure is selected as a suitable structure. At the end, a 250W prototype is designed and constructed and the results are verified experimentally.
Keywords:
Solar Inverter ; High Step-up Converter ; Improving Efficiency Method

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