| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 104 === Due to the limited fossil countries in the world are developing renewable energy sources. Output voltage of solar cells is low. So it is required to boost the voltage and energy from DC to AC. If input current ripple of conventional boost converter is large, the maximum power tracking of the converter used in the PV system will be inaccurate. In order to obtain better performance, output voltage harmonics of inverter should be reduced. To solve the aforementioned problems, a low ripple DC/AC converter is proposed by National Tsing Hua University professor Ching-Tsai Pan in memory of his father Mr. Kung Pan (K.P.). First stage is a low input current ripple high step-up DC/DC converter, and second stage is five level inverter with passive ripple cancellation filter.
In this thesis, a converter prototype with input voltage 150Vdc, the output voltage 220Vrms and a rated power 3kW is implemented. The results show that the proposed converter reduce the input ripple current by 98.1%. Input current ripple’ amplitude can be reduced to 200mA. Five-level inverter with passive ripple cancellation filter can output high power quality.
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