Large Signal Stability Analysis and Stabilization of Converters Connected to Grid Through $LCL$ Filters

This paper develops a robust tool for handling ac side stability issues occurring in $LCL$-filter-based grid-connected converters. $LCL$ filters give advantages in cost and dynamic as smaller inductors employed compared with $L$ filters for the same required damping of the switching harmonics. Nevertheless, the additional poles introduced by the $LC$ part induce resonance in the system leading to stability problems. To deal with this stability …