| Abstract |
The combination of coupled inductors (CIs) and LCL filters can be a filter configuration to achieve highpower density for high current applications. Frequency characteristics (i.e., resonance phenomenon)are changed according to the filter configuration and feedback currents (i.e., inverter-side or grid-sidecurrent) for current control loops. Therefore, stability analysis should be performed to guarantee thestable operation. In this paper, through stability analysis of three possible candidates for coupling L-CL filters, a most promising configuration is suggested, and an active damping method is proposedin consideration of lossless and costless. Finally, for the verification, simulation and experiment areperformed. |
