South Korea's Wando-Dongjeju Project Completed
The Jeju 3 HVDC (High-Voltage Direct Current) project has been successfully completed, marking the country's first voltage-source (VSC) HVDC transmission system. The project, also known as the Wando-Dongjeju #3 HVDC project, is the third HVDC project connecting the South Korean mainland to Jeju Island, following Jeju 1 (Haenam–Jeju) in 1998 and Jeju 2 (Jindo-Jeju) in 2014.
The Jeju 3 (Wando-Jeju) project has a transmission capacity of 200 MW and operates at a voltage of ±150 kV DC. Configured as a symmetrical monopole, it transmits power via 90 km of submarine and underground cable.
The project utilizes MMC VSC technology, with Jeju 3 being the first VSC point-to-point system in South Korea. The first VSC in South Korea - The Yangji Back-to-Back - was commissioned earlier in 2024.
The Jeju 3 HVDC project was a collaborative effort; Korea Electric Power Corporation (KEPCO) being the project owner, LS Cable & System acted as the main contractor for cable production and construction. Hitachi Energy provided the converter station technology and main circuit equipment.
The completion of this project is expected to have significant environmental and economic benefits. It will support Jeju Island's ambitious goal to become carbon-free and powered entirely by renewable energy by 2030. The enhanced power supply will meet the growing electricity demand on the island. Furthermore, it will improve support for Jeju's thriving tourism industry, which hosts over 13 million visitors annually.
