Publication of Research by the Lead Institution in an International Journal

Overview

About this event

The C2 Grid Hub research team investigated the mechanisms underlying AC–DC power imbalances and DC-link voltage excursions in grid-forming (GFM) converters caused by AC-side faults in future power systems interconnected through multi-terminal high-voltage direct current (MTDC) networks. Based on this analysis, the team developed a control strategy to mitigate DC-link voltage excursions.

Considering the converter’s power-flow direction and current-limiting conditions, the team proposed a coordinated strategy combining virtual impedance control with active-power command control. The effectiveness of the proposed strategy was validated through large-scale electromagnetic transient (EMT) simulations of a three-terminal MTDC system embedded in a future Korean transmission network. The results demonstrated that the strategy mitigates both DC-link overvoltage and undervoltage during AC faults while improving post-fault resynchronization.

Led by researcher Yoonseok Kim, with contributions from researchers Cholmin Kim, Chanho Ji, and Min-Seung Ko, the study was accepted for publication on August 12, 2026, in the International Journal of Electrical Power & Energy Systems. This recognition highlights the technical excellence and practical potential of the proposed strategy for ensuring the stable operation of future MTDC-interconnected power systems.