The Research Of Micro-photovoltaic Inverter Based On Interleaved Flyback Circuit

During the21st century, coal, oil, gas and other traditional fossil fuels become increasingly tense, with more serious environmental pollution, solar energy as a resource-rich, clean, renewable energy, occupies an important position in energy strategies for sustainable development. The technology of Solar grid-photovoltaic is a key technology in PV power generation, micro-inverters equipped with a solar panel, which can effectively solve the adverse effects of the shadow for PV array.In this paper, first, analysis of the existing PV inverter topology for the main circuit, through the comparison of various photovoltaic inverter structures, based on high-frequency flyback transformer and combined with the actual situation of the micro-inverters study, this paper give the new interleaved flyback circuit for micro-inverter,. Second, this paper build the simulation model of a photovoltaic solar panel on the Matlab/Simulik simulation platform, basing on mathematical model and physical model of the PV panel, and combination of practical operating parameters of photovoltaic panel. Photovoltaic panels must be carry out the maximum power point tracking, in order to improve the conversion efficiency of photovoltaic energy, according to the simulation model of PV panels. This paper presents a fast and stable maximum power point tracking strategy based on the two considerations of tracking speed and accuracy, in the basis of the analysis of various strategies of maximum power point tracking, and verified the feasibility of this approach by simulation. Finally, according to the need for the main circuit of the new interleaved flyback circuit, the paper designs variety of driving circuit and sampling circuit, and such circuits can meet the circuit requirements by experimental verification.