Research Of Grid-Connected Three-Phase PV Inverter Based On SVPWM

With energy crisis is approaching, developing new green energy that has none pollution has become the emphasis of the energy research. Solar energy which has uniqu e advantage has been paid more attention on.But the key of this study is the research on photovoltaic cells maximum power tracking and algorithm of inverter.This paper starts from the research background and significance.Then,launchs on the MPPT problem of PV system.From analyzing the present method on solving the max ximum power point tracking problem,an improved perturbation and observation method is advised,improving the tracking efficiency on MPPT.Three-phase full-bridge inverter circuit based on LCL filter is choosed as the main circuit topology.The paper lays emphasis on analyzing two modulation methods,and cho oses SVPWM modulation which has an efficient use of energy and a good high frequncy performance.For improving the quality of grid current,a composite method is put forward which include PI control, repetitive controland voltage feed-forward control.Ac cording to the simulation results,not only can it improve the quality of grid-current,but also the stability and anti-interference capability of the system. And the inverter can out put energy by power factor 1.