2024/09/17 by Somayeh Mehri Boroojeni, Boroojeni, Somayeh Mehri, Ehsan Sharafoddin +1 · 1 citation
Energy · Engineering · #FOS: Electrical engineering #HVDC Systems and Fault Protection #High-Voltage Power Transmission Systems #Power Systems and Renewable Energy #Systems and Control (eess.SY) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2409.11548
openalex publication_date 2024/09/17 · openalex created_date 2024/10/24 · openalex updated_date 2026/07/28
Modern power systems increasingly demand converter-driven generation systems that integrate seamlessly with grid infrastructure. Grid-based converters are particularly advantageous, as they operate in harmony with conventional synchronous machines. However, most existing research focuses on managing grid-forming converters (GFM) under normal conditions, often neglecting the converters' behavior during faults and their short-circuit capabilities. This paper addresses these gaps by introducing a power matching-based current limitation scheme, which ensures GFM converter synchronization while preventing over currents. It also highlights the limitations of grid-following techniques, which need to maintain robust grid-forming properties during fault conditions. Unlike conventional methods, no assumptions are made regarding outer power loops or droop mechanisms, and current references are immediately restricted to prevent wind-ups. A dynamic virtual damping algorithm is proposed to improve fault isolation further. This technique enhances fault-ride-through capability and maintains grid-forming properties even in weak grid conditions. The dynamic virtual damping controller and fault mode for GFMs are modeled and validated using detailed simulations in MATLAB. These results demonstrate that altering outer power sources, rather than internal structures, improves converter performance during faults, ensuring grid stability and reliability.