Electrical Drives for Direct Drive Renewable Energy Systems

- Contributor contact details - Woodhead Publishing Series in Energy - Part I: Electrical drive technology - 1. Electrical generators for direct drive systems: a technology overview - Abstract: - 1.1 Introduction - 1.2 Excitation methods - 1.3 Permanent magnet direct drive (PMDD) generator topologies - 1.4 Conclusion - 1.5 References - 2. Principles of electrical design of permanent magnet generators for direct drive renewable energy systems - Abstract: - 2.1 Introduction - 2.2 Design requirements and evaluation criteria - 2.3 Scaling laws for dimensioning machines - 2.4 Design choices - 2.5 Design example - 2.6 Future trends - 2.7 References - 3. Electrical, thermal and structural generator design and systems integration for direct drive renewable energy systems - Abstract: - 3.1 Introduction - 3.2 Integrated systems design of machine topologies - 3.3 Structural considerations and mechanical design - 3.4 Thermal considerations - 3.5 Designs of machine topologies for 5-20 MW direct drive wind turbines - 3.6 Application to direct drive marine energy systems - 3.7 References - 4. An overview of power electronic converter technology for renewable energy systems - Abstract: - 4.1 Introduction - 4.2 Power electronic components - 4.3 Topologies of power electronic converters - 4.4 Modulation techniques in voltage source converters (VSCs) - 4.5 Power control of voltage source converters - 4.6 Conclusion - 4.7 References - 5. Power electronic converter systems for direct drive renewable energy applications - Abstract: - 5.1 Introduction - 5.2 Characteristics of wind and marine energy generation systems - 5.3 Back-to-back voltage source converter (BTB-VSC) - 5.4 Diode rectifier plus DC/DC converter as the generator side converter - 5.5 Application of current source converters (CSCs) - 5.6 Power electronic system design considerations - 5.7 Power electronic system challenges and reliability - 5.8 Conclusion and future trends - 5.9 References - Part II: Applications: wind and marine - 6. Wind turbine drive systems: a commercial overview - Abstract: - 6.1 Introduction - 6.2 Early geared wind turbine drive systems - 6.3 Direct drive generators - 6.4 Doubly fed induction generators (DFIGs) - 6.5 Low- and medium-speed (MS) geared hybrid concept - 6.6 Permanent magnet generators (PMGs) in direct drive wind turbines - 6.7 Alternative technologies and power conversion - 6.8 Reliability, availability and total systems efficiency - 6.8.1 Availability - 6.9 References - 7. Case study of the permanent magnet direct drive generator in the Zephyros wind turbine - Abstract: - 7.1 Introduction - 7.2 Design process and the resulting design - 7.3 Other design considerations - 7.4 Generator assembly - 7.5 Generator testing - 7.6 Operational experience and problems faced - 7.7 Reliability - 7.8 Future trends - 7.9 Conclusion - 7. 10 References - 8. Direct drive wave energy conversion systems: an introduction - Abstract: - 8.1 Introduction - 8.2 Wave energy - 8.3 Direct drive in wave energy - 8.4 Conclusion - 8.5 Acknowledgement - 8.6 References - 9. Case study of the Archimedes Wave Swing (AWS) direct drive wave energy pilot plant - Abstract: - 9.1 Introduction - 9.2 AWS wave energy converter - 9.3 AWS pilot plant power take-off (PTO): design and construction - 9.4 AWS pilot plant power take-off (PTO): test results - 9.5 Conclusion - 9.6 Acknowledgement - 9.7 References - 10. Application of high-temperature superconducting machines to direct drive renewable energy systems - Abstract: - 10.1 Introduction - 10.2 Common superconducting wire materials - 10.3 Advantages of superconducting machines - 10.4 Challenges - 10.5 Superconducting machine topologies - 10.6 Direct drive applications - 10.7 Application to wind turbines - 10.8 Application to wave energy - 10.9 Conclusion - 10.10 References - Index