Summary
With the global expansion of offshore wind power, efficient transmission systems such as High
Read more Read lessVoltage Direct Current (HVDC) are essential to minimise transmission losses. While fixedbottom offshore converter stations have been widely adopted in Europe, Japan’s steep seabed topography necessitates floating structures, which introduce unique mechanical challenges.
Existing design standards primarily address seismic conditions for onshore equipment, leaving a gap in evaluating strength under offshore-specific oscillations and cyclic loads. This study defines and classifies oscillation conditions induced by waves and wind, with a particular focus on the Station Post Insulator (SPI), as a key structural component of HVDC valve towers.
Experimental investigations revealed stiffness degradation in SPIs under long-term loading, which was incorporated into the design of a 320 kV and 525 kV HVDC valve tower. The findings contribute to defining mechanical design requirements for floating offshore converter stations and propose a practical framework for HVDC valve tower design under offshore conditions.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B4_10942_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Japan |
| Study committees | |
| File size | 779 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
SHINOHARA Nobuyuki - Mitsubishi Electric Corporation Japan; KITAMURA Toru - Mitsubishi Electric Corporation Japan; HIRAYAMA Masahiro - Mitsubishi Electric Corporation Japan; YOSHIDA Takashi - Mitsubishi Electric Corporation Japan
Keywords
Floating, Offshore, Converter Station, HVDC, Valve, Tower, Station Post Insulator (SPI), Mechanical Design, Fatigue
