IEC 61400-50-2:2022

Overview

IEC 61400-50-2:2022 is an international standard published by the International Electrotechnical Commission (IEC) that focuses on wind energy generation systems, specifically addressing the application of ground-mounted remote sensing technology for wind measurement. This standard applies to remote sensing devices (RSDs) that measure wind at locations above and distant from their mounting points, such as sodars and vertical profiling lidars. Notably, the standard excludes forward-facing or scanning lidars.

This 2022 edition restructures and replaces previous performance standards IEC 61400-12-1:2017 and IEC 61400-12-2:2013 concerning wind measurement and site calibration, without making technical changes. By isolating wind measurement requirements into separate, focused standards, IEC aims for streamlined revision processes and enhanced applicability across different use cases in the wind energy sector.

Key Topics

• Classification of Remote Sensing Devices (RSDs): IEC 61400-50-2 defines procedures to classify ground-based RSDs by evaluating their sensitivity to varying meteorological conditions across calibration and deployment periods. This process helps to assess uncertainties in wind measurement accuracy.

• Calibration Requirements and Procedures: The standard specifies rigorous calibration and verification procedures for RSDs, ensuring measurement consistency and performance reliability.

• Measurement Uncertainty Assessment: It details methods to quantify uncertainties associated with wind speed measurements, encompassing calibration, classification, environmental factors, and device mounting effects.

• Performance Monitoring: Additional checks like in-situ tests, malfunction detection, and performance consistency assessments during specific measurement campaigns (SMCs) are mandated to maintain measurement integrity.

• Application to Measurement Campaigns: IEC 61400-50-2 outlines how to apply calibration and classification-derived uncertainties to actual wind speed data collected, including interpolation of uncertainties to different heights in the measurement volume.

• Reporting Requirements: Comprehensive reporting standards for classification, calibration, and SMC performance are included to ensure transparency and traceability.

Applications

This standard is essential for experts and engineers engaged in:

• Wind Resource Assessment: Accurate wind measurement using remote sensing devices supports pre-construction assessment of wind energy potential.

• Site Calibration of Wind Turbines: It offers standardized methods for calibrating RSDs used to verify wind turbine power performance.

• Wind Farm Development and Operation: Real-time wind monitoring with ground-mounted remote sensing devices benefits operational decision-making, efficiency optimization, and compliance with regulations.

• Research and Development: The classification and uncertainty evaluation techniques aid R&D activities aiming to improve wind measurement technologies.

• Regulatory and Certification Processes: Adherence to this IEC standard supports conformity assessment and certification related to wind energy projects.

Related Standards

IEC 61400-50-2:2022 is part of the broader IEC 61400 series covering wind energy generation systems. It interfaces with other parts of the IEC 61400 standards, including:

• IEC 61400-50-1: Covers remote sensing technology application in general, complementing this standard’s focus on ground-mounted instruments.

• IEC 61400-12 series: Former comprehensive performance standards for power performance and site calibration, now restructured with wind measurement separated.

• Additional IEC 61400 parts: Addressing wind turbine design, testing, environmental assessment, and more.

These interconnected standards collectively establish a comprehensive framework for quality assurance, measurement accuracy, and performance in wind energy systems.

Keywords: IEC 61400-50-2, wind measurement standard, ground-mounted remote sensing, wind energy generation, wind speed measurement uncertainty, sodars, vertical profiling lidars, wind turbine site calibration, wind resource assessment, IEC wind standards, wind measurement calibration.