6 papers
Structural Decoupling and Current-Angle Steering for Post-Fault Recovery of Current-Limited Grid-Forming Inverters
Neethu Sajeev, Stephen Arinze Obi, Jae-Jung Jung
Reliable fault recovery of grid-forming (GFM) converters under current-limited conditions is increasingly important as inverter-based resources replace synchronous generation. Exis…
Structural Analysis and Internal Stability Enhancement of Virtual-Admittance-Based Cascaded GFMIs Under Unity Voltage-Feedback Decoupling
Stephen Arinze Obi, Ki-Hyun Kim, Jae-Jung Jung
Virtual admittance (VA) is widely used in cascaded voltage-control and current-control (VC-CC) grid-forming inverters (GFMIs) because it shapes the converter terminal behavior whil…
Negative Resistance Caused by Intra-Loop Coupling in Virtual-Admittance-Based Grid-Forming Control
Jaekeun Lee, Minwoo Jeong, Jae-Jung Jung +2
This paper addresses the harmonic instability problem of the virtual-admittance (VA)-based grid-forming control. It is revealed that the intra-loop coupling among the VA control, t…
Decoupled Internal Energy Regulation and Inertial Response Provision for Grid-Forming Multilevel-Converter-Based E-STATCOMs
Ki-Hyun Kim, Yeongung Kim, Shenghui Cui +1
As power systems accommodate higher shares of renewable generation, short-term power imbalances become more frequent and can manifest as pronounced voltage and frequency excursions…
Mitigation of Structural Harmonic Instability in Virtual Admittance-Based Grid-Forming Inverters via Mimicking Skin Effect
Jaekeun Lee, Jae-Jung Jung, Shenghui Cui
The virtual admittance-current controller (VA-CC) scheme is widely employed to emulate an equivalent inductance in front of the internal voltage source of grid-forming inverters. H…
Transient Stability Analysis of Grid-Forming Converters with Current Limiting Considering Asymmetrical Grid Faults
Seongyeon Kim, Ki-Hyun Kim, Shenghui Cui +1
Under asymmetrical faults, analyzing the transient stability of grid-forming voltage-source converters (GFM-VSCs) becomes essential because their behavior fundamentally differs fro…