摘要
DC microgrids (MGs) have gained prominence owing to efficient energy conversion and great integration of distributed energy resources. However, the large number of deployed power electronic converters brings system stability issues. Since conventional small-signal analysis may fail to capture nonlinear dynamics under large disturbances, large-signal stability assessment becomes crucial for reliable DC MGs operation. To address this, mixed potential theory (MPT) has been adopted as a framework for large-signal stability analysis. While MPT provides an effective framework for large-signal stability analysis through circuit energy potentials, its analytical scope is primarily limited to physical circuit components. The impact of control parameters without circuit representations on stability is difficult to elucidate. To fill this gap, this paper proposes a generalized MPT large-signal stability analysis method. This method reshapes the controller dynamic model into RLC equivalent circuits. On this basis, the main circuit and controllers can be uniformly analyzed by MPT, thereby characterizing the systems' large signal stability boundary. Finally, the correctness of the proposed generalized MPT large signal stability analysis in DC MG is verified through simulation.