Project Scope:
Technical advisory support for the evaluation of technology options for a ~200 km subsea HVDC interconnector (up to 720 m water depth, 600 MW capacity). The objective was to compare converter and cable technologies based on 50Hertz’s experience and international best practices, to support informed decision-making on optimal design parameters for the interconnection.

Key Responsibilities & Achievements:

• Conducted a comparative assessment of 320 kV and 525 kV HVDC cable technologies (XLPE vs. Mass Impregnated), evaluating technical performance, maturity, scalability, and cost implications.

• Analyzed the technical constraints and performance limits of VSC technology for asymmetrical monopole configurations.

• Assessed the impact of deep-sea installation conditions (up to 720 m depth) on cable design, installation methodology, and operational reliability.

• Evaluated technical and environmental considerations related to sea electrode design and feasibility.

• Benchmarked VSC versus LCC converter technologies, comparing scalability, operational flexibility, technology maturity, and lifecycle cost aspects.

• Prepared draft and final technical reports outlining comparative findings and strategic recommendations.

• Presented conclusions and recommendations to key stakeholders in bilingual technical sessions.

Outcome:
Delivered a comprehensive, technology-neutral evaluation framework and clear design recommendations, supporting robust technology selection for a large-scale subsea HVDC interconnection project.