Open AccessA Model Predictive Approach for Enhancing Transient Stability of Grid-Forming Converters
Author(s) -
Ali Arjomandi-Nezhad,
Yifei Guo,
Bikash C. Pal,
Damiano Varagnolo
Publication year - 2024
Publication title -
ieee transactions on power systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.312
H-Index - 263
eISSN - 1558-0679
pISSN - 0885-8950
DOI - 10.1109/tpwrs.2024.3368626
Subject(s) - power, energy and industry applications , components, circuits, devices and systems
A model predictive control (MPC) method for enhancing post-fault transient stability of grid-forming (GFM) inverter-based resources (IBRs) is developed in this paper. This proposed controller is activated as soon as the converter enters into the post-fault current-saturation mode. It aims at mitigating the instability arising from insufficient deceleration due to current saturation and thus improving the transient stability of a GFM-IBR. The MPC approach optimises the post-fault trajectory of GFM IBRs by introducing appropriate corrective phase angle jumps and active power references where the post-fault dynamics of GFM IBRs are addressed. These two signals provide controllability over GFM IBR's post-fault trajectory. This paper addresses the mitigation of oscillations between current-saturation mode and normal mode by forced saturation if conditions for remaining in the normal mode do not hold. The performance of the proposal is tested via dynamic simulations under various grid conditions and compared with other existing strategies. The results demonstrate significant improvement in transient stability.