6 papers
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…
DSP-Based Sub-Switching-Period Current-Limiting Control for Grid-Tied Inverter under Grid Faults
Jaeyeon Park, Jiyu Lee, Junyeol Maeng +1
This paper presents a sub-switching period current-limiting control for a grid-tied inverter to prevent transient overcurrents during grid faults and enable seamless fault ride-thr…
Accelerated Transformer Energization Sequence for Inverter Based Resources in Black-Start Procedures with Active Flux Trajectory Manipulation in the Stationary Reference Frame
Jiyu Lee, Shenghui Cui
This paper proposes advanced soft-magnetization techniques to enable ultra-fast and reliable black-start of grid-forming (GFM) converters. Conventional hard-magnetization with well…
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…