Technology Research, Low-power Full-bridge Pv Grid-connected Inverter

The modern society has been plagued by the energy crisis all the time. In order to achieve sustainable energy development, we must actively develop alternative energy sources. Solar energy as an inexhaustible supply of renewable green energy, has more incomparable advantages compared to other new energy sources. The distributed home PV system is an effective means to alleviate the energy crisis. The low power full-brige photovoltaic inverter is the core equipment of the home Photovoltaic System. So the focus of this paper is on the technology research of the low power full-brige photovoltaic inverter.The whole photovoltaic inverter includes hardware and software. The hardware includes the main power circuit and the signal detection and control circuit. The main power circuit is used for the energy transmission. The signal detection and control circuit is used to measure the system parameters and output the manipulating parameteres. The software includes the kinds of realizations of the algorithms, protection and communications. The working principles and parameters calculation of the BOOST circuit and the full-bridge inverter circuit are full studied in the main power circuit part. The amplitude frequency characteristics of signal detection channels and the CPLD control logic are full studied in the signal detection and control circuit part. As the low power full-bridge photovoltaic inverter is the marketing product, we optimize the design of the hardware on the cost and electromagnetic compatibility of the inverter. The maximum power tracking control algorithms and the full-bridge inverter and grid-connected control algorithms are full studied in the software part.Finally, according to the above hardware and software technology research, we designed a 3KW full-bridge photovoltaic grid-connected inverter based on the TMS320F2812. It is verified by the experiments that the performance of the inverter achieved the design targets.