Stability Assessment of a Three-Phase Grid-Tied PV Inverter with Eigenvalue-Based Method


Zhiqing Yang, Qilei Wang, Julia Warmuz, Rik W. De Doncker; IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG), June 2019, Pages 722-727, doi: 10.1109/PEDG.2019.8807681



This paper presents small-signal stability assessment of a grid-tied PV inverter system by using the eigenvalue-based method. A full-order state-space model is established considering controllers, grid synchronization, system delay and passive elements. The influences of different parameters on the system stability are analyzed by observing eigenvalue locus. The impact of different components on system stability is analyzed through participation analysis. Stability improvements through a better control design are discussed and validated.