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Electrical Drives for Direct Drive Renewable Energy Systems

Book Description

Wind turbine gearboxes present major reliability issues, leading to great interest in the current development of gearless direct-drive wind energy systems. Offering high reliability, high efficiency and low maintenance, developments in these direct-drive systems point the way to the next generation of wind power, and Electrical drives for direct drive renewable energy systems is an authoritative guide to their design, development and operation.

Part one outlines electrical drive technology, beginning with an overview of electrical generators for direct drive systems. Principles of electrical design for permanent magnet generators are discussed, followed by electrical, thermal and structural generator design and systems integration. A review of power electronic converter technology and power electronic converter systems for direct drive renewable energy applications is then conducted. Part two then focuses on wind and marine applications, beginning with a commercial overview of wind turbine drive systems and an introduction to direct drive wave energy conversion systems. The commercial application of these technologies is investigated via case studies on the permanent magnet direct drive generator in the Zephyros wind turbine, and the Archimedes Wave Swing (AWS) direct drive wave energy pilot plant. Finally, the book concludes by exploring the application of high-temperature superconducting machines to direct drive renewable energy systems.

With its distinguished editors and international team of expert contributors, Electrical drives for direct drive renewable energy systems provides a comprehensive review of key technologies for anyone involved with or interested in the design, construction, operation, development and optimisation of direct drive wind and marine energy systems.

  • An authorative guide to the design, development and operation of gearless direct drives
  • Discusses the principles of electrical design for permanent magnet generators and electrical, thermal and structural generator design and systems integration
  • Investigates the commercial applications of wind turbine drive systems

Table of Contents

  1. Cover image
  2. Title page
  3. Table of Contents
  4. Copyright
  5. Contributor contact details
  6. Woodhead Publishing Series in Energy
  7. Part I: Electrical drive technology
    1. Chapter 1: Electrical generators for direct drive systems: a technology overview
      1. Abstract:
      2. 1.1 Introduction
      3. 1.2 Excitation methods
      4. 1.3 Permanent magnet direct drive (PMDD) generator topologies
      5. 1.4 Conclusion
    2. Chapter 2: Principles of electrical design of permanent magnet generators for direct drive renewable energy systems
      1. Abstract:
      2. 2.1 Introduction
      3. 2.2 Design requirements and evaluation criteria
      4. 2.3 Scaling laws for dimensioning machines
      5. 2.4 Design choices
      6. 2.5 Design example
      7. 2.6 Future trends
    3. Chapter 3: Electrical, thermal and structural generator design and systems integration for direct drive renewable energy systems
      1. Abstract:
      2. 3.1 Introduction
      3. 3.2 Integrated systems design of machine topologies
      4. 3.3 Structural considerations and mechanical design
      5. 3.4 Thermal considerations
      6. 3.5 Designs of machine topologies for 5–20 MW direct drive wind turbines
      7. 3.6 Application to direct drive marine energy systems
    4. Chapter 4: An overview of power electronic converter technology for renewable energy systems
      1. Abstract:
      2. 4.1 Introduction
      3. 4.2 Power electronic components
      4. 4.3 Topologies of power electronic converters
      5. 4.4 Modulation techniques in voltage source converters (VSCs)
      6. 4.5 Power control of voltage source converters
      7. 4.6 Conclusion
    5. Chapter 5: Power electronic converter systems for direct drive renewable energy applications
      1. Abstract:
      2. 5.1 Introduction
      3. 5.2 Characteristics of wind and marine energy generation systems
      4. 5.3 Back-to-back voltage source converter (BTB-VSC)
      5. 5.4 Diode rectifier plus DC/DC converter as the generator side converter
      6. 5.5 Application of current source converters (CSCs)
      7. 5.6 Power electronic system design considerations
      8. 5.7 Power electronic system challenges and reliability
      9. 5.8 Conclusion and future trends
  8. Part II: Applications: wind and marine
    1. Chapter 6: Wind turbine drive systems: a commercial overview
      1. Abstract:
      2. 6.1 Introduction
      3. 6.2 Early geared wind turbine drive systems
      4. 6.3 Direct drive generators
      5. 6.4 Doubly fed induction generators (DFIGs)
      6. 6.5 Low- and medium-speed (MS) geared hybrid concept
      7. 6.6 Permanent magnet generators (PMGs) in direct drive wind turbines
      8. 6.7 Alternative technologies and power conversion
      9. 6.8 Reliability, availability and total systems efficiency
      10. 6.8.1 Availability
    2. Chapter 7: Case study of the permanent magnet direct drive generator in the Zephyros wind turbine
      1. Abstract:
      2. 7.1 Introduction
      3. 7.2 Design process and the resulting design
      4. 7.3 Other design considerations
      5. 7.4 Generator assembly
      6. 7.5 Generator testing
      7. 7.6 Operational experience and problems faced
      8. 7.7 Reliability
      9. 7.8 Future trends
      10. 7.9 Conclusion
    3. Chapter 8: Direct drive wave energy conversion systems: an introduction
      1. Abstract:
      2. 8.1 Introduction
      3. 8.2 Wave energy
      4. 8.3 Direct drive in wave energy
      5. 8.4 Conclusion
      6. 8.5 Acknowledgement
    4. Chapter 9: Case study of the Archimedes Wave Swing (AWS) direct drive wave energy pilot plant
      1. Abstract:
      2. 9.1 Introduction
      3. 9.2 AWS wave energy converter
      4. 9.3 AWS pilot plant power take-off (PTO): design and construction
      5. 9.4 AWS pilot plant power take-off (PTO): test results
      6. 9.5 Conclusion
      7. 9.6 Acknowledgement
    5. Chapter 10: Application of high-temperature superconducting machines to direct drive renewable energy systems
      1. Abstract:
      2. 10.1 Introduction
      3. 10.2 Common superconducting wire materials
      4. 10.3 Advantages of superconducting machines
      5. 10.4 Challenges
      6. 10.5 Superconducting machine topologies
      7. 10.6 Direct drive applications
      8. 10.7 Application to wind turbines
      9. 10.8 Application to wave energy
      10. 10.9 Conclusion
  9. Index