Ripple Current Analysis of Three-level Inverter based on SVPWM and Design of LCL Filter
نویسندگان
چکیده
Three-level gird-connected converter is used more and more widely in renewable energy generation system. At the same time LCL filter is also widely utilized in order to achieve lower current harmonic. However, current research about LCL filter is mostly aimed at two-level inverter. The study involving multilevel inverter is much less. When using space vector pulse width modulation, Current transient process near the current peak value of three-level inverter in one switching period is analyzed. And the lower limit of arm side inductance is obtained through the study of maximum ripple current. After that, based on LCL filter model for high order harmonic, the impact on ripple inhibition and resonant frequency caused by different filter parameters and scale factor is analyzed, Which provides a basis for design of LCL output filter parameters. Finally, calculations are made. Both the simulation and experiment results verify the validity of the proposed Design method. Key-Words: three-level inverter, SVPWM, LCL filter, harmonic, ripple.
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