Fault Recovery and Transient Stability of Grid-Forming Converters Equipped with Current Saturation
arxiv(2024)
摘要
When grid-forming (GFM) inverter-based resources (IBRs) experience large grid
disturbances (e.g., short-circuit faults), the current limiter may be triggered
and GFM IBRs enter the current saturation mode, inducing nonlinear dynamical
behaviors and imposing great challenges to the post-disturbance transient angle
stability. This paper presents a systematic study to reveal the fault recovery
behaviors of a GFM IBR and identify the risk of instability. The impact of the
angle of the magnitude-saturated current on the post-fault recovery and
transient stability is also investigated. The selection of the angle of
magnitude-saturated current significantly influences the post-fault behaviors
while a few additional dynamical conditions that have a substantial impact are
also identified. It is found that the system may follow multiple post-fault
recovery trajectories depending on those conditions: 1) Convergence to the
normal stable equilibrium point (SEP), 2) convergence to the saturated stable
equilibrium point (SSEP), and 3) divergence (instability). To examine the
models' accuracy, several cases are simulated.
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