5 papers
Seamless Contraction-Control Framework for Unplanned Grid-Connected/Stand-Alone Transitions of Grid-Forming Inverters
Qianxi Tang, Li Peng
Unplanned grid-connected (GC)/stand-alone (SA) transitions commonly occur in AC microgrids during protection trips, manual breaker operation, or low-bandwidth supervisory communica…
A Unified Framework for Contraction Stability Analysis of Heterogeneous Grid-Forming Inverters
Qianxi Tang, Li Peng
The shift to renewable-dominated power systems has produced low-inertia grids, undermining system stability. In this context, grid-forming inverters (GFMs) have emerged as a promis…
Voltage Synchronization and Proportional Current Sharing of Grid-Forming Inverters
Qianxi Tang, Li Peng
Most previously proposed controllers are analyzed in the small-signal/quasi-steady regime rather than large-signal or transient stability for grid-forming inverters (GFMI). Additio…
Symmetric Sliding-Mode Control of Grid-Forming Inverters With Precision Region Under AC and DC Sides Varying
Qianxi Tang, Li Peng, Xuefeng Wang +1
Voltage regulation under conventional grid-forming controllers is tightly coupled to power sharing and dc-link dynamics. Consequently, its tracking accuracy deteriorates during gri…
Theoretical Grid-Forming Extreme of Inverters
Qianxi Tang, Li Peng
What are the theoretical and physical limits of a grid-forming inverter? This letter proposes that the extreme grid-forming ability of inverters is limited by their dc-side, ac-sid…