High-Efficiency Power Conversion System for Kilowatt-Level Stand-Alone Generation Unit With Low Input Voltage
Rong-Jong Wai
Chung-You Lin
Rou-Yong Duan
Yung-Ruei Chang
Dept. of Electr. Eng. & Fuel Cell Center, Yuan Ze Univ., Chungli;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct. 2008
Volume: 55,
Issue: 10
On page(s): 3702-3714
ISSN: 0278-0046
Digital Object Identifier: 10.1109/TIE.2008.921251
First Published: 2008-03-21
Current Version Published: 2008-09-30
Abstract This paper mainly focuses on the development of a high-efficiency power conversion system for kilowatt-level stand-alone generation units with a low output voltage, such as photovoltaic modules, fuel cells, and small-scale wind generators, and it aims at having the same output ac voltage, i.e., $110 hbox{V}_{rm rms}/break60 hbox{Hz}$ as the utility power for the utilization of a stand-alone power supply. This high-efficiency power conversion system includes one high-efficiency high-step-up dc–dc converter and one soft-switching dc–ac current-source inverter. This dc–dc converter is capable of solving the voltage spike problem while the switch is turned off, and it can achieve the objectives of high efficiency and high voltage gain. Because the techniques of soft switching and voltage clamping are used in the dc–ac current-source inverter, the conversion efficiency could greatly be improved. The effectiveness of the designed circuits is verified by experimentation, and the maximum efficiency of the entire high-efficiency power conversion system is over 91% based on the experimental measurements.
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