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Summary of Quality Infrastructure for Small Wind Turbines

Core Content

This report from the International Renewable Energy Agency (IRENA) provides an in-depth analysis of quality infrastructure (QI) for small wind turbines (SWTs). It outlines the importance of QI in supporting the development and deployment of renewable energy technologies, particularly in the context of small wind turbines. The report is part of a series on QI for small-scale renewable energy technologies, offering guidance and insights for policymakers, manufacturers, and practitioners.

Main Points

• Quality Infrastructure (QI) is a system that includes standards, testing, certification, and other mechanisms to ensure the reliability, safety, and performance of renewable energy technologies.
• QI is essential for building trust in the market, reducing transaction costs, and attracting investment and new talent.
• International Standards such as IEC 61400-2 and ISO/IEC 17025 play a key role in defining the baseline for SWT performance, safety, and testing.
• Testing and Certification are crucial components of QI, ensuring that SWTs meet required performance and safety standards.
• The report highlights the importance of harmonisation of standards across countries and the potential benefits of regional certification schemes like Solar Keymark.

Key Information

Technology Overview

• Small wind turbines convert wind's kinetic energy into electrical energy using a rotor and generator.
• They can be classified into horizontal-axis (HAWT) and vertical-axis (VAWT) types.
• Most SWTs use a three-bladed HAWT configuration, though other designs exist.
• A tower or support structure is essential, and its height must be chosen carefully to balance wind access and maintenance requirements.
• Overspeed control is a critical design feature to ensure safe operation.

Market Status

• The global market for SWTs is diverse, with applications ranging from off-grid to grid-connected systems.
• Off-grid systems are more common, especially in rural and remote areas.
• Grid-connected systems are growing in industrialised countries with supportive incentive policies.
• As of 2013, over 870,000 SWTs had been installed globally, with China leading in both quantity and capacity.
• The United States and the United Kingdom also show significant growth due to incentive policies.
• China dominates the off-grid market, while Germany and Italy rank highly in installed units and capacity respectively.

Challenges and Opportunities

• A key challenge is cost containment while maintaining the integrity and reliability of QI.
• There is a need for rigorous training of installers, especially in emerging markets.
• Product maturity should be considered when implementing testing and certification, ensuring that SWTs are stable and commercial before undergoing full testing.
• Misleading performance claims and inflated product labels are a significant threat to the SWT market, undermining consumer trust and legitimate industry growth.

Developing QI

International Standards

• IEC 61400-2 is the primary international standard for SWTs, with multiple revisions (1995, 2006, 2013).
• Additional standards include IEC 61400-11, IEC 61400-12-1, ISO/IEC 17025, and ISO/IEC 17065.
• These standards cover acoustic noise measurement, power performance, mechanical loads, and conformity assessment.

Testing and Certification

• Testing is necessary to verify product performance and safety.
• Certification bodies and accredited laboratories are essential for implementing these standards.
• IEC Consumer Labels are used to indicate compliance with international standards.
• The report recommends gradual development of QA requirements, starting with simpler and less costly tests, and progressing to more comprehensive ones as the market matures.

Country-Specific Examples

• China: Strong market growth with a focus on off-grid systems.
• Denmark: Well-developed QI with a focus on grid-connected systems.
• Japan: JSWTA has developed national standards similar to international ones.
• Spain: CIEMAT and other institutions are involved in testing and certification.
• Sweden: Strong emphasis on standards and testing.
• United Kingdom: RenewableUK and MCS (Microgeneration Certification Scheme) play a key role.
• United States: AWEA and SWCC (Small Wind Certification Council) are central to QI development.

Recommendations

• Base national standards on existing international standards to reduce costs and ensure consistency.
• Harmonise country requirements to facilitate trade and reduce duplication.
• Develop regional or international networks to share costs and responsibilities.
• Implement training programs for installers to ensure proper system performance and safety.
• Use a staged approach to QI development, starting with basic tests and gradually increasing complexity as the market grows.

Conclusion

Quality infrastructure is vital for the sustainable growth of the small wind turbine market. It ensures that products meet safety and performance standards, supports market development, and builds consumer trust. The report provides a comprehensive guide for developing and implementing QI, tailored to the specific needs of small wind technologies.