Research And Implement Of Single Phase Photovoltaic Inverter

As the energy and environmental problems have become increasingly prominent, a high efficient, clean, new energy is needed. As the fact of that solar energy is easy to use, clean and friendly, it has attracted widespread attention. Inverter as a key link between the solar panels and grid, whose performance will directly affect the utilization of solar energy. In this paper, single-phase photovoltaic grid inverters, circuit topology, hardware and software structure of the system are analyzed.Firstly, a brief introduction of the purpose and significance of this research, as well as related research at home and abroad was given, and the main contents of this paper was highlighted. Based on an overview of the inverter principle, the SPWM technology and the main topology were presented.Secondly, hardware and software architecture of this single phase photovoltaic grid-connected inverter were illustrated. The hardware part included four structures: the power module, interleaved fly-back module, full-bridge module and the feedback network. The software part included: a state machine, maximum power point tracking algorithm and PLL module design.Finally, MATLAB simulation, circuit programming and debugging and some experiments were carried out to test the usefulness of the program. The CCS5.5(Code Composer Studio) was used to program and debug the microchip of TMS320F28035. The maximum power point tracking(MPPT) technology was systematic and comprehensive analyzed. The photovoltaic, DC-DC boost and the MPPT module were mathematical modeled and experimental simulated. The open loop of the inverter, the PV inverter system and the main circuit were tested. Experimental results show that the design requirements are satisfied, and the solar energy system is high efficiency, stable, safe and reliable, with high practical value.