IEC 61400-26-1:2019

Overview

IEC 61400-26-1:2019 is an international standard developed by the International Electrotechnical Commission (IEC) that focuses on the availability of wind energy generation systems (WEGS). This standard defines a comprehensive information model to derive and report both time-based and production-based availability indicators, providing standardized metrics for availability calculation and reporting. The core goal is to harmonize methods that characterize the operational performance of wind turbines and wind power stations, allowing stakeholders to monitor, analyze, and improve wind energy system availability effectively.

IEC 61400-26-1:2019 applies universally to individual wind turbines, fleets of turbines, complete wind power stations, or even portfolios of multiple stations. It replaces previous technical specifications (IEC TS 61400-26-1:2011, IEC TS 61400-26-2:2014, and IEC TS 61400-26-3:2016), marking its establishment as a key resource for the wind energy sector.

Key Topics

• Information Model for Availability: The standard introduces a detailed information model that categorizes operational data, distinguishing between concurrent states and providing structured criteria for time and production allocation.

• Information Categories: IEC 61400-26-1 defines specific categories to classify wind energy generation system status such as:

  • OPERATIVE: When the system is fully or partially performing its intended service.
  • OUT OF SERVICE: Includes technical standby, environmental or electrical specification limits, and requested shutdowns.
  • NON-OPERATIVE: Covers scheduled maintenance, planned corrective actions, forced outages, and suspended operations.
  • FORCE MAJEURE: Covers uncontrollable external events impacting availability.
  • INFORMATION UNAVAILABLE: Addresses data gaps or uncertainty.

• Service Layers: The model accounts for multiple service delivery layers including potential, actual, time-based, and lost service capacities, crucial for understanding performance dynamics and maintenance impacts.

• Entry and Exit Criteria: The standard specifies how to allocate fractions of operational time and production to correct information categories through unambiguous entry and exit criteria.

• Applicability: The standard supports measurement at various organizational levels from single turbines to whole wind power stations, providing flexibility for operational and portfolio management.

Applications

IEC 61400-26-1:2019 serves practical roles for manufacturers, operators, maintenance providers, and regulatory bodies within the wind energy sector by:

• Performance Monitoring: Enabling consistent tracking of wind turbine and wind power station availability for operational optimization.

• Maintenance Planning: Providing clear categorization of system statuses that aid in scheduling preventive and corrective maintenance activities.

• Reporting and Benchmarking: Offering standardized metrics useful for reporting to regulators, investors, and stakeholders. This facilitates benchmarking across different wind assets and fleets.

• Improving Reliability: By identifying availability trends and causes of outages or performance degradation, stakeholders can target improvements that enhance energy production.

• Portfolio Management: Allowing wind farm operators and asset managers to aggregate availability data for diverse assets, improving decision-making at the portfolio level.

Related Standards

• IEC 61400 Series: This part 26-1 standard complements other IEC 61400 standards addressing wind turbine design, testing, and performance measurement.

• IEC TS 61400-26-2 and IEC TS 61400-26-3: Earlier technical specifications on availability metrics now integrated or superseded by this edition.

• International Electrotechnical Vocabulary (IEV): Provides terminology harmonization which aligns with IEC 61400-26-1 to ensure consistent communication across the electrotechnical sector.

• Other Wind Energy Operation Standards: Standards focused on wind turbine safety, grid integration, and maintenance management are aligned with availability reporting under IEC 61400-26-1.

By implementing IEC 61400-26-1:2019, the wind energy industry benefits from a unified framework for assessing and reporting availability. This facilitates improved transparency, operational efficiency, and continual enhancement of wind power generation systems globally.