Hyosung Heavy Industries is moving to localize large-capacity high-voltage direct current (HVDC) transmission equipment, a special ultra-high-voltage transformer system with a high degree of technological complexity. The company unveiled the core technologies of its HVDC equipment at the “2026 Korea Energy Show,” held from the 16th to the 18th at BEXCO in Haeundae-gu, Busan.

HVDC is a transmission method in which alternating current generated at power plants is converted into high-voltage direct current and transmitted to its destination, then converted back into more easily usable alternating current for supply. By way of simple analogy, electricity is first put on a “direct-current-only high-speed train” and sent with minimal loss, then transferred just before use to a household “ordinary alternating-current bus.” While conventional ultra-high-voltage transformers handle only alternating current, HVDC converter stations must manage electricity as AC–DC–AC and control the load. At this exhibition, Hyosung Heavy Industries displayed models of key equipment used in HVDC converter stations, such as converter valves, which act as “current converters,” and controllers, which serve as the “brain” issuing precise commands.

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