Modeling and Mitigation of Resonance Current for Modified LCL-Type Parallel Inverters With Inverter-Side Current Control

Modified LCL-type filter is adopted in parallel three-level inverters for high-frequency zero circulating current mitigation. However, it will generate internal resonance circulating current (IRCC) and external resonance circulating current (ERCC), which causes the output current unstable unavoidably. To address this issue, in this article, the model of IRCC and ERCC is established and analyzed. I...