Cigre 2026 Session

What happened

Researchers from the C2 Grid Hub participated in the CIGRE Paris Session 2026, held in Paris, France, from August 23 to 28, 2026, and presented their research on the stable design and operation of future HVDC-integrated power systems.

At the joint B4-C4 workshop, Junchol Lee presented GFM control technologies for a ±525 kV, 2 GW VSC-HVDC system planned for Korea’s West Coast Energy Highway, building on the design and commissioning experience gained from the Yangju BTB MMC-HVDC system. The presentation highlighted VSM and droop control designed for low-system-strength conditions, together with EMT simulation results validating key grid-support functions.

During the B4 session, Jongwon Kang reviewed the GFM-HVDC damping performance requirements proposed by major transmission system operators and international projects. He also presented a passivity-based validation approach for assessing whether HVDC converters contribute positively to power system stability across different frequency ranges.

Also during the B4 session, Chanho Ji analyzed the impact of MMC internal dynamics on DC-droop gain tuning and stability assessment in future offshore MTDC systems. By comparing detailed and reduced-order models, the study highlighted the importance of considering MMC internal dynamics and model fidelity when designing reliable control gains.

During the C2 session, Minsung Kim presented a multi-point frequency measurement-based method for estimating effective system inertia and assessing regional inertia in future power systems with increasing penetration of inverter-based resources. The proposed approach addresses the limitations of single-point measurements and helps identify regions that may be relatively vulnerable to frequency disturbances.

Through these presentations, the C2 Grid Hub shared its research achievements with international experts across key areas of future HVDC-integrated power systems, ranging from the design and performance validation of large-scale GFM-HVDC systems to MTDC control stability and low-inertia power system operation.