摘要
This paper presents a comparative study of three passivity-based stability analysis methods for grid-connected converters. While all three methods are feasible for stability analysis, the first two methods require prior knowledge of transmission-line modeling, making them sensitive to transmission-line uncertainties. In contrast, the third method does not rely on detailed transmission-line information, offering a simpler and more intuitive approach for system design in grid applications. Simulation results are finally provided to verify the feasibility of all three methods in evaluating system stability, highlighting the superiority of the third method.