PD CLC/TS 61400-26-3:2017 - Page 4

Wind energy generation systems. Availability for wind power stations | Status: Superseded, Withdrawn

1 Scope This part of IEC 61400, which is a technical specification, provides a framework from which time-based and production-based availability indicators of a wind power station can be derived. It unambiguously describes how data is categorised and provides examples of how the data can be used to derive availability indicators. The approach is to apply the terms and definitions for the applied information models introduced in IEC TS 61400‑26‑1 and IEC TS 61400‑26‑2 to a wind power station. The basic approach is based on the assumption that a wind power station may be modelled as one 'WTGS' representing a complete wind power station. The wind power station is made up of all WTGSs, functional services and balance of plant elements as seen from the point of common coupling. It is not the intention of this specification to define how time-based and production-based availability shall be calculated. Nor is it the intention to form the basis for power curve performance measurements – which is the objective of IEC 61400‑12. However, the annexes should be regarded as examples and guidelines for developing methods for calculation of availability indicators. This document also includes informative annexes with:

• • examples of how to expand the model to more services,
• • examples of how to determine the information category for the wind power station,
• • examples of how to expand the model to balance of plant elements,
• • examples of determination of lost production,
• • examples of availability algorithms for production based indicators,
• • examples of other availability indicators,
• • examples of application scenarios.