Systematic Approach for Transient Stability Evaluation of Grid-Tied Converters during Power System Faults

摘要: Grid-tied converters subject to severe grid faults might experience transient instability and loss of synchronization. As studying this phenomenon deals with large-signal disturbances, a linearized equivalent will no longer be an accurate approximation the system. Consequently, highly used approach is perform time-domain simulation studies detailed model system assess stability overall performance. However, such result in large computational burden limited physical insight To address issue, paper presents systematic inherently nonlinear problem alongside methodology for setting control parameters avert instability. Using simplified converter, it shown that phase-plane analysis analyzing synchronization stability. end, critical damping ratio phase-locked loop can found identify domain attraction state trajectories, which has been experimentally verified. together engineering system, one set controller guarantee during worst-case planning settings protection devices.