Research And Design On Grid-Connected Photovoltaic Micro-Inverter Based On New Interleaved Flyback

Faced with the grim situation of the global environment, human resistance to fossil fuels has become more and more strongly, the research on the development of clean energy is becoming more and more powerful. Solar energy as a green and sustainable new energy has been favored by researchers. Distributed photovoltaic power generation because of its convenient installation, high energy conversion efficiency, market prospects and other advantages has rapidly developed. Micro inverter is the core module of photoelectric conversion, because of its low cost and high conversion efficiency of the photovoltaic industry has become a hot research topic.The first chapter of this paper describes the research background and content of the project. The second chapter elaborates the evolution of micro inverter, focusing on the interleaved flyback micro inverter topology structure and circuit principle. Interleaved flyback micro inverter transformer parameters and micro inverter control method is proposed. The third chapter focuses on the photovoltaic inverter MPPT algorithm. The traditional maximum power point tracking algorithm development has been simple told. Based on the traditional perturbation and observation method and combined linear fitting method, the MPPT algorithm has been improved. The simulation experiment in MATLAB shows that the algorithm is feasible.Based on the principle of interleaved flyback micro inverter circuit and the requirement of the actual circuit parameters, the experimental development platform of micro inverter is built. The main control chip is TMS320F2812 DSP. In this paper, some hardware circuit has designed. Based on the results calculated by the circuit principle, switching tubes, resistors and other components have designed. Finally on the experimental platform the experimental verification of the circuit design has been completed. This paper measured the simulation of photovoltaic power generation in the AC side voltage waveform, transformer secondary side current in DCM state waveform and the DC sides of the transformer voltage waveform, the results verify the feasibility of the third chapter proposed an improved MPPT algorithm. Finally, according to the experimental results, the analysis results are given. The practicability and effectiveness of the PV micro inverter development platform are verified.