V MW TM. Selecting the Optimum Drive Train. Anders Bach Andersen Senior Product Manager - V MW TM

Transcription

1 V MW TM Selecting the Optimum Drive Train. Anders Bach Andersen Senior Product Manager - V MW TM

2 Agenda 1. Design Drivers for the V MW TM 2. Evaluation Method 3. Selection of Drive Train 2

3 1 Design Drivers for the V MW TM

4 Lower Cost of Energy = Higher Return on Investment High energy capture High availability at high wind High reliability Low maintenance High serviceability High yield Low OPEX & Less downtime Cost of Energy embraces all aspects in wind power performance CoE = Annualized CAPEX + Annualized OPEX Annual Energy Production 5

5 Higher Business Case Certainty Business case certainty is the customers certainty for achieving the return on investment as anticipated at the time of final investment decision. Return on Investment Probability Illustration Probability [%] Calculated IRR at final investment decision Good Poor IRR [%] Business Case Certainty 6

6 2 Evaluation Method 7

7 Advanced Cost of Energy-model Adopting Customer s Perspective Technology assessments Cost and performance modelling of technologies Rotor diameter Rated Power Tip speed Drive train.. Load to Cost Array cable cost model Foundation cost model Power curve Customer value Customer value is quantified in cash flow models to identify optimum choices Output: Cost of Energy Return of investment Business Case Certainty Market assessments Market conditions consolidated into reference sites Average wind speed Water depth Park size Illustrative numbers shown 8

8 3 Drive Train Selection

9 Making the right design choices Using a 360 degree development process and competing work streams 10

10 Drive Train Cost Effectiveness (CAPEX) Geared drive trains showed more favorable cost scaling for the high torque needed for next generation offshore turbines. Torque reduction by tip speed increase will increase loads for structural components, not at least the foundation. Full Paper figure 4: Illustrative drive train cost scaling (Dimensions for illustration only) Full Paper Figure 5: Fatigue loads applied to the foundation as a function of tip speed, other parameters kept the same. 11

11 Energy Efficiency (Annual Energy Production) Medium speed and direct drive provided the same approximately the same power curve performance 12 Full Paper Figure 6: Indicative drive train efficiency as a function of power (Note bottom line is not zero)

12 Drive Train Reliability (OPEX) Removable of parallel stages in the medium speed drive train reduce failure sources and a larger generator increases failure sources. 13 Full Paper Figure 9: Illustrative lifetime replacement rates (Dimensions for illustration only)

13 Medium Speed Drive Offers Highest Return on Investment Both CAPEX, OPEX and supply chain risk are considered in the benchmark Medium speed offers the highest return on investment when replacement rates for both concepts is factored in. Medium speed offers higher return on investment Direct drive IRR has higher sensitivity to replacement rates. Number of terminations, amount insulation and air-gap control will lower the direct drive generator reliability. The medium speed drive train is less sensitive to price and availability of strategic raw materials. 14

14 Supply Chain Risk for Direct Drive? Two strong arguments: Price and availability? 15

15 The V MW TM Drivetrain Separate wind loads and torque will minimize undesired loads in the drivetrain Main shaft Main bearing housing Bed frame Coupling Gearbox Generator 16

16 Thank you for your attention Copyright Notice 2011 Vestas Wind Systems A/S. All rights reserved. This document was created by Vestas Wind Systems A/S on behalf of the Vestas Group and contains copyrighted material, trademarks and other proprietary information. This document or parts thereof may not be reproduced, altered or copied in any form or by any means without the prior written permission of Vestas Wind Systems A/S. All specifications are for information only and are subject to change without notice. Vestas Wind Systems A/S does not make any representations or extend any warranties, expressed or implied, as to the adequacy or accuracy of this information. This product is in its current form a 50 Hz version and therefore not available for 60 Hz markets. This product will not be released for sale in all locations/countries. Vestas Wind Systems A/S shall not have any responsibility or liability whatsoever for the results of use of the documents by you.