• • A land-sea integrated DC collection scheme for gigawatt-scale offshore wind bases enables efficient transmission and fault ride-through, addressing the lack of conventional AC support and reducing economic costs compared to point-to-point DC.
• • A thyristor-based DC transformer for desert renewable bases reduces converter and line investment costs while solving reactive power compensation and voltage control issues inherent in AC collection.
• • A heterogeneous UHVDC system with only 37.5% full-bridge submodules achieves no-blocking DC fault ride-through, significantly reducing device count and cost while maintaining reliability.
• • The world's first RB-IGCT-based HCC demonstration showcases advanced technology but also reveals practical limitations, providing critical field data for further optimization.