The Research Of Modeling And Simulation Of PV Grid Inverter Based On Unipolar Switching Mode

With the gradual depletion of traditional energy sources such as coal, oil and gas as wellas human to environmental protection. Research and application of solar photovoltaic powergeneration system has an extremely important significance. Grid-connected inverter as thecore component of the grid-connected PV systems, grid-connected inverter as object of study.Grid-connected inverter is the main solar array power conversion fed into the grid, thispaper take the single-phase two-tier system structure, before the level of the DC/DC step-uplink, after the class DC/AC grid-connected inverter link.Design based on the Boost multi-level DC/DC step-up before the link of the main circuitand control circuit based on the maximum power point tracking, the establishment of themathematical model and simulation model, to achieve a maximum power of multiple solarcells slip independent tracking.Designed based on the isolation transformer full-bridge after-class DC/AC inverter linkand the inverter output current control SPWM control strategy. Compared whit the unipolarswitching mode and bipolar switching SPWM control level that after the DC/AC inverter link,the output waveform and the efficiency of the difference between proposed unipolar switch toimprove the work efficiency of the inverter approach. To establish the corresponding mathematicalmodel and simulation model to simulate the feasibility of the design results show.