Wind Energy Handbook. Michael Barton Graham

Wind Energy Handbook - Michael Barton Graham


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edition, as the fundamental theory underpinning wind turbine design has not changed, but many chapters have been expanded to cover recent developments. In view of the significant effects of wakes on wind farm energy yield and turbine loadings, the opportunity has been taken to add a completely new chapter (Chapter 9) entitled ‘Wake Effects and Wind Farm Control’. This includes a detailed treatment of engineering models of the wake and their implications for wind farm control, which is emerging as a way to both increase wind farm energy production and reduce turbine fatigue loading by mitigating wake interaction effects. There is also a section on wind farm control and the grid system, recognising the increasing importance of using wind farms to provide ancillary services to the grid.

      The main changes to the existing chapters are as follows:

      Chapter 1: Introduction This chapter has been brought up to date to reflect the continuing increase in the size of wind turbines and wind farms.

      Chapter 2: The Wind Resource Updated to include edition 4 of the IEC standard. An illustrative example of the Gumbel method for extreme winds has been added. The description of turbulence in wakes and wind farms has been replaced by a more comprehensive treatment in the new Chapter 9.

      Chapter 5: Design Loads for HAWTs The changes are mainly minor. The description of IEC load cases has been updated as necessary. A structurally more efficient blade cross‐section has been adopted for the trial blade design, while retaining the existing plan‐form. New figures have been added showing effect of yaw and wind shear on blade root bending moments for a pitch‐regulated turbine.

      Chapter 6: Conceptual Design of Horizontal Axis Wind Turbines New sections have been added covering high‐speed rotors, low induction rotors, multiple rotor structures, and the effect of the number of blades on CP. Also the initial sections on choice of machine size and rating have been amended to reflect the growth in turbine size. The section on generators has been expanded to include innovative approaches to drive trains and power conversion.

      Chapter 7: Component Design The section on blade design has undergone major revision and expansion, including a more detailed treatment of the static and fatigue properties of laminates. A simplified example of the fatigue design of a blade with spar caps is presented to illustrate the steps involved. The manufacturing process is described in more detail and new sub‐sections on blade testing, leading edge erosion, and bend‐twist coupling have been added.

      Chapter 8: The Controller New sections have been added to cover wind speed estimation and LiDAR‐assisted control.

      Chapter 9: Wake Effects and Wind Farm Control – see above.

      Chapter 10: Onshore Wind Turbine Installations and Wind Farms (previously Chapter 9) This chapter has been revised and updated to take account of important developments in understanding and managing the environmental impact of wind energy developments. Since the second edition, there has been a considerable increase in the literature on environmental impact and in the sophistication of software tools for the effective, sustainable development of wind farms.

      Chapter 11: Wind Energy and the Electric Power System (previously Chapter 10) Wind energy is an increasingly important source of electricity generation, and practice for connecting turbines and wind farms to the network and integrating their operation is developing rapidly. The chapter has been revised and updated to address these important developments, including evolving Grid Code requirements and the increasing integration of wind energy into power system operation.

      Floating offshore wind turbines offer the opportunity to dramatically increase the exploitable resource, and the technology is now moving beyond the prototype stage, with several pilot wind farms already in operation. A new section on floating offshore wind turbine structures has therefore been added, encompassing different configurations, governing design criteria and design methods. Three case studies are also included.

      The section on monopile design has been extended to include the new approach to geotechnical design made possible by the PISA research project. The description of different types of fixed support structure has been updated to reflect current developments and a new section added covering fatigue design curves.

      Publicly funded monitoring programmes have enabled much to be learned about the environmental impacts of offshore wind farms, and some of these findings are reported in a new section on environmental monitoring. Finally, the section on power collection and transmission has been updated to describe the use of modular multi‐level convertors for HVdc transmission.

      Acknowledgements for the First Edition


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