| Summary: | 碩士 === 東南科技大學 === 電機工程研究所 === 99 === This thesis studies a single-phase grid-connected photovoltaic system based on a Z-source inverter. The system directly converts the DC power generated by the photovoltaic modules into AC power and connects to the utility power system. Moreover, Z-source inverter is a single-stage topology, so its efficiency could be higher than other multi-stage systems. When the sun moves during a day or cloud cover changes, the system makes use of the buck-boost feature of the Z-source and applies the maximum-power-point-tracking scheme to output the maximum power of the photovoltaic modules. In addition, the system is based on a 32-bit digital signal processor TMS320F2808 to realize a full digital photovoltaic power system. Because the system only uses the PWM generator of the DSP TMS320F2808 to output all the Z-source trigger signals, it does not need the extra digital circuit hardware and the cost of system is decreased. Finally, the experimental results show that the system could work on a wide voltage range from 130-300 volts. The maximum output power of the system is up to 1kWatt and the efficiency of the system can reach to 97%. It is very suitable to apply to small power of solar power system.
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