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Wind farm re-powering, life extension and decommissioning

Providing new energy solutions: UK Tech Week, Turkey

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Wind farm re-powering, life extension and decommissioning

  1. 1. Wind farm re-powering, life extension and decommissioning Wind farm re-powering, life extension and decommissioning Providing new energy solutions: UK Tech Week, Turkey 16-18 February 2021 1
  2. 2. Agenda • Lifecycle of wind farm • Operations and maintenance (O&M) phase • End of life - Repowering - Life time extension - Decommissioning Wind farm re-powering, life extension and decommissioning 2
  3. 3. We cover the whole wind farm asset portfolio from start… Wind farm re-powering, life extension and decommissioning Pre-feasibility • Resource analysis • Wind measurement campaign • Site suitability and selection • Desktop studies • Grid connection reviews • Market benefits and profitability • Site access and transportation of plant • Preliminary layout and design • Preliminary energy yield assessment Feasibility • Initial financial modelling and technology assessment • Initial development schedule and construction assessment • Resource data analysis • Environmental and social assessments • Hydrological and geotechnical studies • Layout design and optimization • Energy Yield Assessment or Annual Energy Production • Network and connection studies & modelling • Tender design • Civil/electrical and balance of plant works • Front-end engineering and design Consent • Planning application • Environmental and social impact assessments • Transmission line route studies • Technical environmental studies and energy yield impact • Stakeholder management Financing • Financial modelling (including assessment of current market incentives and policy) • Lender’s advisor/engineer • Owner’s engineer • Technical advisor/consultant • Procurement 3
  4. 4. … to finish. And can help you decide whether to repower, extend or decommission at the end of normal project lifetime. Wind farm re-powering, life extension and decommissioning Construction • Engineering, procurement, and construction management • Construction monitoring • Owner’s engineer site rep • Site calibration • Technical advisor/consultant • Lender’s advisor/engineer • Discharge of planning conditions Commissioning and start-up • Commissioning and start-up services • Plant testing and performance assessment/ verification • Power curve verification testing (during operational phase) Operation and maintenance • Operational reviews • Operation, maintenance and site management services • Health, safety, quality and environment management (HSQE) and auditing • Environmental impact studies • Asset/O&M optimization Decommissioning and repowering • Repowering studies • Life extension studies • Decommission studies • Site restoration 4
  5. 5. Project lifecycle risk profile Wind farm re-powering, life extension and decommissioning Project cycle Risk of not meeting objectives Financial exposure Level of project definition Residual risk Financial Closure 100% COD • Site identification (pre-feasibility) • Feasibility phase • Consent phase • Project definition and tendering • Financing phase Construction Phase (1-year) Operational and maintenance (revenue) Phase (20-25 years) Decommissioning, repowering or life extension (End of Project Lifecycle) 5
  6. 6. Operations and maintenance Wind farm re-powering, life extension and decommissioning 6
  7. 7. Preparing for the wear and tear of wind turbines Wind farm re-powering, life extension and decommissioning We reduce the impact of asset failures by analyzing and identifying replacement parts before it even happens. Machine failure rate Break in Normal operation Wear out Individual measurement sample (sets) Last measurement (sets) Time The 'wear out period’ starts towards the end of the normal project lifetime. However, this isn’t a fixed period; it depends on the fatigue incurred during its operational period as well as the operations and maintenance strategy adopted by the owner. 7
  8. 8. Using detailed high-speed data to predict the best time to replace components to keep businesses going Wind farm re-powering, life extension and decommissioning 3D rendering of the graph This graph shows a number of different vibrational channels with identified abnormal signature frequencies. Amplitude Frequency in HZ HS gear; 800, 1600, 2400 and 3200 HZ IS gear; 192, 384, 576, 772, 1156, 1734 HZ 100HZ LS gear; 59HZ Not identified in this figure due to space/scaling are: Blade frequencies (<25 Hz) Blade passage Gearbox rotational frequencies (<100Hz) Higher order harmonics 8
  9. 9. We analyze to forecast where fatigues can occur using rainflow counting Rainflow counting is a method used to count fatigue cycles Wind farm re-powering, life extension and decommissioning Probability density function Power spectral density Structural model Fatigue modeler Fatigue life 9
  10. 10. Wind farm end of life: repower, optimize or decommission? Wind farm re-powering, life extension and decommissioning 10
  11. 11. Deciding on the best end-of-life option Wind farm re-powering, life extension and decommissioning Repowering involves energy yield analysis and studies to optimize the configuration Lifetime extension / optimization involves examining the risk profile of the asset Decommissioning involves taking down the wind farm, recycling as much as possible, and restoring the site 11
  12. 12. Lifetime extension Wind farm re-powering, life extension and decommissioning 12
  13. 13. Full-service capability for developers and financial institutions Wind farm re-powering, life extension and decommissioning Proven methodology for reducing uncertainties using the Weibull correlation technique Detailed availability and efficiency analysis together with Probability of Exceedance analysis 13 • Topographical data • Annual energy production of new turbines • Known wind resource (environmental resource) such as speed and direction • Trends over the last 20 years, speed, direction and temperature • Balance of plant Make informed decision regarding future options after the plants normal design life, based on the data collected in the last 20-years
  14. 14. Providing analysis of current and future wind farms to understand the return on investment Wind farm re-powering, life extension and decommissioning The topographical map shows the number of wind turbines installed. The yellow directional segments shows the direction of the wind which is mainly coming from the west. It also shows the amount of energy that the wind turbines can extract from the wind. The red bars at the end of the yellow segment indicate the energy lost due to the wake effect from the wind turbines upwind. 14
  15. 15. Optimizing the expected energy output based on historical operations… Using a probability of exceedance (PoE) curve to determine the expected production and thus the financial viability of a wind farm beyond its normal lifetime. Wind farm re-powering, life extension and decommissioning Probability of exceedance Net AEP vs probability of exceedance For check P90/P50(10-YEARS): 15
  16. 16. Deciding on optimization and extension after 20 years Wind farm re-powering, life extension and decommissioning Mean time between failures of components including repair time 16
  17. 17. Designing the optimum approach to life extension Graph showing that after 20 years (normal design life of wind farms) the wind farm can be continued to be operated. This shows reduced availability either due to retiring some identified wind turbines or due to operational constrains that will reduce fatigue. Wind farm re-powering, life extension and decommissioning Options for the owner: 1) Switch some turbines off if O&M cost is too high 2) Continue to use turbines that are operational and in good condition (possibly with some operational constrains) 3) Replace some targeted components on identified turbines. 0.880 0.900 0.920 0.940 0.960 0.980 1.000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Availability Year Wind Farm Availabilty vs Time Kilgarvan I Gneeves I Booltiagh I Knockawarriga I Mienvee Flughland Kilgarvan II (10 x N90) Kilgarvan II (3 x N90) Kilgarvan II (V52) Lisheen I Owenreagh I Owenreagh II Lisheen II KnockacummerI KnockacummerII Glentane Garracummer Glenduff Booltiagh II (V90) Booltiagh II (E82) Booltiagh II (SWT) Loughaun North Gneeves II Glentane II Knockawarriga II Knockawarriga III Kilgarvan III Seegronan Gronan Tieges Year Availability 17
  18. 18. Designing life of the asset by studying each component and their efficiency through time Efficiencies and available applied Wind farm re-powering, life extension and decommissioning We apply international standards and guidelines in combination with the knowledge from our asset management and O&M teams to calculate future energy production for new and existing wind farms after their normal 20-year design life. 18
  19. 19. Long term temperature data suggest increase in extreme temperatures affecting future energy production of wind turbines. Temperature cycles are fatigue cycles that need to be included in the end of life extension calculations. Climate change affect the operation of the wind turbine Wind farm re-powering, life extension and decommissioning Figure 5-3: Temperature and de-rate curves 2.2MW. 0 TO 1.500masl Wind speed at HH versus temperature curve 19
  20. 20. We know and understand the relevant standards Wind farm re-powering, life extension and decommissioning We calculate the life extension of an asset based on: • ISO 55001 of Asset Management • IEC 61400-12-1 International Standard We do this while addressing the full lifecycle of the asset. The graph shows data mining from a wind farm site. We can use this information to optimize O&M configuration during the normal operational life of a wind farm as well as the period beyond the normal end of life. Correlation sodar data Denham; July 2020 20
  21. 21. End of life opportunities Wind farm re-powering, life extension and decommissioning • Known resource > repowering and or life extension - Same installed capacity with less turbines - Lower Environmental and Social Impact Assessment (lower rpm (visual, noise), less uncertainties, less development risk • Known resource > repowering and or life extension - Known fatigue life (Mean Time Between Failures and Mean To Repair) - Little additional investment - Reduce cut-out wind speed - Extend by 10-15 years 21
  22. 22. Why is decommissioning the last resort? Wind farm re-powering, life extension and decommissioning Decommissioning involves removing assets, recycling and site restoration. This is usually the last resort when repowering and life extension are not viable options. 22
  23. 23. Delivering a more sustainable world Our purpose
  24. 24. Find out more, contact: Paul van Lieshout Technical Director/SME – wind, solar and hybrid power systems Wind farm re-powering, life extension and decommissioning 24
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