The present report deals with the system level integration of the innovations of the different work packages (WPS) of the InnWind.eu project with respect to support structure design assessment. Emphasis is put on the following two crucial aspects:
System integration of rotor-nacelle-assembly (RNA) and support structure
WT integration and reliability- and risk-based planning of operation and maintenance (O&M) for innovative support structures in order to minimize total lifetime costs
These two aspects contributed by ForWind – University of Oldenburg (OLD) and Aalborg University (AAU) respectively are presented in separated sections of the report denoted as Part A and Part B. The specific targets of Part A include:
Challenges in design integration for very large wind turbines and the interaction of RNA and a bottom-mounted support structure are described in terms of frequency design window, operational range and optimization of energy yield.
Recommendation shall be given on design choices for rotor orientation, blade planform and stiffness, tower clearance and tower diameter with respect to blade-tower interaction.
The overall effect of tower top mass as well as drivetrain and generator configurations shall be investigated.
Cost-effective design methodologies shall be assessed.
While Part B aims at:
The report shall describe the state of the art of reliability and risk-based planning of O&M for offshore wind turbine support structures.
Illustration in numerical examples of methodology developed in cooperation with WP4.
The two above-mentioned methodologies are used as part of the assessment of the innovative designs which are developed in WP 2-4. Success will be measured by the completeness of the methodology in addressing the specific targets of the deliverable and its applicability in assessing application of system integration design and O&M incl. inspections in design and operation of innovative support structures.