Stability Region Exploring of Shunt Active Power Filters Based on Output Admittance Modeling

A shunt active power filter (SAPF) is coupled with load admittance in weak grid conditions, which poses a challenge to stability analysis. In this article, the model of SAPF developed, reveals coupling mechanism between and concisely accurately. On top that, region system investigated. The passivity guarantee first explored. However, has very narrowband at specific frequency, makes it difficult achieve. then studied turns out be an extension region, especially expanded. Therefore, much easier meet. stability-oriented design summarized flowchart. end, effectiveness newly defined verified by experimental results.