Importance of Foundation Design for Wind Turbines
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A brief introduction to Offshore wind turbine, problems associated,difference from other foundation, types used, basic theory, and design loads.
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Importance of Foundation Design for Wind Turbines
- 1. IMPORTANCE OF FOUNDATION DESIGN • HIGH COST OF THE FOUNDATION ( NEARLY 25%-35% OF OVERALL COST ) • NATURAL FREQUENCIES OF THESE STRUCTURES ARE VERY CLOSE TO THE FORCING FREQUENCIES OF THE WIND, WAVE, ROTOR FREQUENCY AND BLADE SHADOW FREQUENCY.
- 2. FOUNDATION DIFFERENCES OIL & GAS PLATFORM VS WIND TURBINES RELATIVELY STIFF RELATIVELY FLEXIBLE STRUCTURAL DYNAMICS NOT CRITICAL STRUCTURAL DYNAMICS VERY CRITICAL WAVE LOAD DOMINANT WAVE AND WIND LOAD BOTH IMPORTANT STRAIGHT FORWARD RELATION FORCE-RESPONSE COMPLEX, UNCORRELATED LOADING ‘PROTOTYPE’ GENERALLY LARGE NUMBERS
- 3. DESIGN CRITERIA & CONSIDERATIONS • LOADS: MAGNITUDE OF THE PERMANENT LOAD OF THE PLATFORM WIND / WAVE / CURRENT RATIO VERTICAL / HORIZONTAL LOADS QUASI STATIC / CYCLIC • WATER DEPTH • SEA FLOOR SOIL TYPE CURRENT -> SCOURING • FABRICATION, TRANSPORTATION & INSTALLATION AVAILABLE CONSTRUCTION SITES / EQUIPMENT
- 4. GRAVITY FOUNDATIONS • LOADING SITUATION VERY DIFFERENT FROM PILED FOUNDATION • SUBSTANTIAL VERTICAL LOADING REQUIRED ( STABILITY) • GENERALLY IMPRACTICAL SUPPORT STRUCTURE FOR WIND TURBINES IN RELATIVELY SHALLOW WATER
- 5. PILED FOUNDATIONS • FLEXIBILITY / ADAPTABILITY : SOIL CONDITIONS WATER DEPTH SCOUR DIAMETER AND WALL THICKNESS TENSION & COMPRESSION PENETRATION AND NUMBER TRACK RECORD / EXPERIENCE DIFFERENT INSTALLATION METHODS
- 6. CHOICE OF FOUNDATION TYPE • LOADS WIND / WAVE / CURRENT HORIZONTAL AND VERTICAL QUASI STATIC / CYCLIC • WATER DEPTH • SOIL CONDITIONS • STORAGE REQUIREMENTS • TRANSPORTATION / INSTALLATION EQUIPMENT REQUIREMENTS • AVAILABLE CONSTRUCTION SITES / EQUIPMENT • ECONOMICS
- 9. CURRENT & FUTURE PROTOTYPES • CURRENT FOUNDATION TYPES INCLUDES FOUNDATIONS CURRENTLY AVAILABLE TO OFFSHORE WIND DEVELOPERS • FUTURE PROTOTYPES INCLUDES FLOATING AND DEEPWATER CONCEPTS
- 10. FOUNDATIONS USED ON UTILITY-SCALE OFFSHORE WIND PROJECTS TODAY: •Mono pile •Gravity foundation •Tripod foundation
- 11. FLOATING CONCEPTS: WHILE SEVERAL FLOATING OFFSHORE WIND CONCEPTS EXIST, TWO DESIGNS ARE THE BEST KNOWN: • HYWIND • WINDFLOAT
- 12. HYWIND WINDFLOAT
- 13. ANALYSIS TO BE DONE : Preliminary Sizing Stability Load Case Structural Design
- 14. DESIGN LOAD CASES: • POWER PRODUCTION FAULT • PARKED FAULT • ADDITIONAL CASES • ULTIMATE STRENGTH LOAD CONVERGENCE • FATIGUE LOAD CONVERGENCE
- 15. DESIGN IN SHORT
- 16. THANK YOU