Abstract
The synchronization dynamics of grid-connected power converters are known to have a tremendous impact on transient stability and fault ride-through performance under grid faults. Up till now, the modeling of converter synchronization stability, which has paved the way for numerous enhanced control methods, is developed around the assumption that the grid fault is symmetrical. However, this is rarely the case. Moreover, grid codes require dual-sequence current injection during asymmetrical faults, which implies that the previously developed models are no longer valid during unbalanced conditions. To address these issues, this article identifies the necessary stability conditions during asymmetrical conditions and presents a quasi-static large-signal reduced-order model of a grid-following converter for analyzing its synchronizing interaction with the external network during symmetrical and asymmetrical grid faults. The modeling approach is developed and tested for three different short-circuit faults: A single line-to-ground fault, a double line-to-ground fault, and a line-to-line fault. The accuracy of the proposed model is verified through detailed simulation studies and experimental tests. Thus, this model can be used to assess the transient synchronization stability of grid-following converters during any type of grid fault, and due to its low-order representation, it may be well applicable for large-scale power system studies.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: IEEE Journal of Emerging and Selected Topics in Power Electronics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.