풍력 블레이드 실규모 구조 시험을 위한 국제표준 (IEC 61400-23 Ed.2) 개정 내용에 대한 시험기술 및 신뢰성향상 측면에서의 고찰
A Study on Testing Technology and Reliability Improvement in the Revised International Standard (IEC 61400-23 Ed.2) for Full-scale Structural Testing of Rotor Blades
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The ongoing revision of the international standard IEC 61400-23 aims to enhance the reliability of full-scale wind turbine blade testing. This paper examines the revised content of IEC 61400-23 in terms of technical aspects and reliability enhancements of blade testing, drawing on extensive experience with blade certification tests. Key changes in the revised version include broader definitions of test subjects, such as specific sections or sub-components of the blade, modifications in safety factors for calculating test loads in static and fatigue load tests, and conditions for exemptions from blade testing considering design similarity. However, when analyzing these major changes, it is difficult to conclude that the revision effectively improves the reliability of the tests, which is its primary objective. For instance, the necessity to test entire blades has been eliminated, and the safety factor for fatigue formulation error has been removed. Additionally, it is questionable whether the revision positively affects the ease and efficiency of test implementation, given the significant increase in the scale and capacity of testing equipment required for blade section tests and the need to perform static load tests in multiple directions. It is imperative for relevant experts to thoroughly consider the purpose and direction of this IEC 61400-23 revision.
Abstract
The ongoing revision of the international standard IEC 61400-23 aims to enhance the reliability of full-scale wind turbine blade testing. This paper examines the revised content of IEC 61400-23 in terms of technical aspects and reliability enhancements of blade testing, drawing on extensive experience with blade certification tests. Key changes in the revised version include broader definitions of test subjects, such as specific sections or sub-components of the blade, modifications in safety factors for calculating test loads in static and fatigue load tests, and conditions for exemptions from blade testing considering design similarity. However, when analyzing these major changes, it is difficult to conclude that the revision effectively improves the reliability of the tests, which is its primary objective. For instance, the necessity to test entire blades has been eliminated, and the safety factor for fatigue formulation error has been removed. Additionally, it is questionable whether the revision positively affects the ease and efficiency of test implementation, given the significant increase in the scale and capacity of testing equipment required for blade section tests and the need to perform static load tests in multiple directions. It is imperative for relevant experts to thoroughly consider the purpose and direction of this IEC 61400-23 revision.
참고문헌 (10)
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- GLOBAL WIND REPORT 2024, "Joyce Lee", GWEC, 148~149 (2024)
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- J. B. Kim, "Construction of Material &Component Test Center to Support R&D of Wind Turbine Industry", The 2022 Fall Conference of Korea Wind Energy Association (2022)
- K. T. Ha, "Current Status of IEC 61400-23For Wind Blade Test Certification", The 2023Fall Conference of Korea Wind Energy Association (2023)
- "IEC TC88 MT23, IEC 61400-23(Edition 1.0)WIND TURBINES – Part 23: Full-scale structural testing of rotor blades", ~ (2014)
- "IEC TC88 MT23, IEC 61400-23(Edition 2.0 Rev N draft3) WIND TURBINES – Part 23:Full-scale structural testing of rotor blades", ~ (2023)
- W. K. Lee, "A Study on the International Standard for Full-scale Structural Testing of Rotor Blades (IEC 61400-23): Test Technology and Reliability Improvement", The 2024 Spring Conference of Korea Wind Energy Association (2024)
- M. G. Kang, "A Study on the Type of Component Structural Test for Extra Large Wind Turbine Blade", The 2023 Spring Conference of Korea Wind Energy Association (2023)