RUDONG, China, June 24, 2025 /PRNewswire/ -- On June 20, 2025, the 400 kV Huangshayang Converter Station, Asia's largest offshore converter station located in Rudong, Jiangsu Province, China, successfully completed scheduled comprehensive maintenance and returned to service. The maintenance enhances the reliability of offshore wind power transmission, ensuring stable power supply during the peak summer demand period.

The seven-day maintenance operation covered three offshore sites-the 400 kV Huangshayang Converter Station, the 220 kV Xiatong and Xiaru Step-up Stations-as well as the onshore 400 kV Lvgu Converter Station. The Huangshayang facility, the world's largest offshore flexible DC converter station by capacity and voltage class, serves as the central hub for aggregating wind power from three offshore wind farms in Rudong, with a total installed capacity of 1.1 gigawatts (GW).

Chen Yong, Director of the Maintenance Department at Jiangsu Power Transmission and Transformation Company, said, "With an annual power output of 3.3 billion kWh, the station accounts for nearly 10% of Jiangsu's offshore wind power capacity, enough to offset about 5% of the province's peak summer demand shortfall."

To ensure a smooth operation, a professional team of over 100 personnel from the company performed a full-spectrum inspection of high-voltage primary and secondary systems, converter valves, thermal management infrastructure, and other mission-critical components. The team successfully executed 312 maintenance tasks across all four sites.

As the three offshore sites are located nearly 70 kilometers from the coast, coordinating of personnel, equipment and supplies posed a major logistical challenge. Wang Xiangjun, the project leader, explained that the team adopted a "dynamic grid management" approach, assigning tasks to designated individuals for real-time progress monitoring and closed-loop quality assurance.

During execution, the team combined aerial pivoting and segmented positioning techniques to achieve millimeter-grade alignment in the installation of large equipment, addressing the spatial constraints of the offshore converter platform.