Modeling and design-oriented control of transient stability of grid-following converters have attained an increasing interest in recent years. Despite novel nonlinear models enabling a design-oriented enhanced transient stability controller, the focus has so far been limited to study only the synchronization dynamics of the phase-locked loop. To expand upon the knowledge of the large-signal performance and stability, this article proposes a systematic analysis procedure of a grid-following converter under weak-grid conditions and large-signal disturbances including the outer dc-link and ac-side voltage control loops. A reduced-order large-signal model is used to analyze the large-signal nonlinear behavior of the system using the area of the basin of attraction as a measure for large-signal robustness. Here, stabilizing and destabilizing trends for outer-loop controller parameters are given. Through a surrogate-model expensive black-box optimization algorithm, a computational-efficient optimal design of the outer-loop controller parameters is proposed to maximize the large-signal robustness. Finally, a recommendation and a design guideline for converter constraints and outer-loop controller parameters are given. This can be used to identify the influencing parameters for grid-following converters under large-signal disturbances, and as a tool for fast controller optimization toward large-signal robustness.
Optimal Controller Design for Transient Stability Enhancement of Grid-Following Converters Under Weak-Grid Conditions
2021-01-01
Taul , M G , Wu , C , Chou , S-F & Blaabjerg , F 2021 , ' Optimal Controller Design for Transient Stability Enhancement of Grid-Following Converters Under Weak-Grid Conditions ' , IEEE Transactions on Power Electronics , vol. 36 , no. 9 , 9380162 , pp. 10251-10264 . https://doi.org/10.1109/TPEL.2021.3066205
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC: | 629 |
Impact of Circular Current Limiters on Transient Stability of Grid-Forming Converters
BASE | 2022
|Synchronous power control of grid-connected power converters under asymmetrical grid fault
BASE | 2017
|