Technology qualification plan for very large wind turbine blades

Abstract

As wind turbines scale beyond 15 MW and blades exceed 100 m in length, ensuring structural integrity and operational reliability becomes increasingly complex. Accelerated development cycles and intensifying global market competition, driven by the emergence of new turbine manufacturers and design concepts, particularly from outside Europe, further heighten the need for systematic, risk-informed technology qualification (TQ). These trends introduce uncertainty by compressing the time available for design validation and by requiring project bids to be made on the basis of turbine models that may still be under development, often with unproven performance or limited field data. This paper presents a comprehensive TQ methodology for very large wind turbine blades, integrating a full Failure Modes, Effects, and Criticality Analysis (FMECA) with a tailored qualification plan aligned to DNV-RP-A203. The FMECA identifies both conventional and scale-induced failure modes, with a particular focus on leading edge erosion, spar cap failure, adhesive debonding, lightning damage, and, aeroelastic and flow-induced instabilities. Each high- and very-high-risk failure mode is mapped to specific qualification activities - such as simulation, laboratory testing, field trials, and in-service monitoring - creating a traceable risk mitigation pathway. The study serves as a reference for future blade developments, incorporating cross-sector insights from aerospace, offshore energy, and nuclear qualification practices to strengthen the methodology. Through focusing qualification efforts on the most critical risks and combining model-based analysis with targeted physical evidence, the proposed framework supports faster, safer certification of next-generation rotor technologies, enabling confident deployment of ultra-large blades in a competitive, rapidly evolving global wind energy market.