Welcome to Task 33 Results
The work in Task 33 started in October 2012 and was divided in three main steps. Firstly, an overview about all the initiatives on wind turbine reliability in the participating countries was prepared in an internal state-of-the-art report. It shows that a huge demand on reliability figures exists, but none of the surveys described was detailed enough and in the same time containing data from enough individual wind turbines for deriving sound reliability figures. However, it got clear that a wide database can only get set up, if many operators collaborate and commonly assemble their data. This in return makes standards necessary on, what data to collect and how.
Secondly, it was decided to work on the three issues ‘operators demands’, ‘appropriate statistical methods’, and ‘required reliability data’ in three more or less autonomous working groups in parallel. The OA together with a so called scope group strived at steering the work and aligning the contents. The results have been summarized in three individual reports, which achieved sufficient contents and formats end of 2014 / beginning 2015.
In a third step, the Task 33 team then jointly derived suggestions from these group reports and started wording ‘IEA Wind Recommended Practices’ on Reliability Data. An industry workshop with chaired discussions on the one hand underlined the necessity of internationally agreed guidelines and on the other hand provided important contributions to the upcoming ‘recommended practices’. Task 33 is going to publish the ‘recommended practices’ end of 2016.
These ‘recommended practices’ will not prescribe the one best way for data collection and analyses but will try leading users to their individually suitable solution according to their individual purpose.
Main general outcomes are:
- While there is broad industry recognition that reliability and reliability data are becoming increasingly critical to both profit margins and LCoE, the lack of standards associated with reliability data for Owner / Operators is adversely impacting industry progress in addressing reliability issues.
- Historically, reliability data is rarely considered by the Owner / Operators at the early stages of wind asset development and warranty based operation.
- The reliability ambitions of wind asset Owner / Operators range from those comfortable with a complete reliance on third parties, such as OEMs to manage asset reliability, to those seeking control of maintenance strategies and actively managing asset reliability.
- While the ability for Owner / Operators to compare, or benchmark, reliability metrics associated with their assets against those of their peers exists, uptake has been restricted, in part, by the availability and consistency of reliability data.
Concluding recommendations are:
For Owner Operators:
- Consider reliability data to be of high value from the early stages of wind asset development and a key operational factor throughout the life of the wind asset. Ensure access to reliability data and required data are factored into negotiations with developers / OEMs / suppliers / service providers.
- Organizational reliability ambitions should be linked to the use cases and examples provided in this study.
- All staff engaged directly, or indirectly, in the production, collation and analysis of reliability metrics should be educated on the strategic significance of reliability data and empowered to improve related business processes and practices.
- Map all wind asset components and maintenance activity to one of the taxonomies / designation systems identified in this study. This will allow for improvements in both the consistency and integrity of reliability data throughout an organization and at the interfaces with the supply chain.
- Align operating states with those specified in IEC 61400-26 1/2 the standard for time and production based availability assessment for wind turbines.
- Whenever practical seek to automate the data collection / collation process as a means of reducing the risk of human error and improving data quality.
- Wind farm Owner / Operators should engage in external, industry-wide sharing of reliability and performance data. This will align data collection methodologies, drive organizational improvements and achieve statistically significant populations of data for reliability analyses
Standards development for the wider industry:
- Develop a wind specific version of the ISO 14224:2006 standard. This would provide a core standard for the language and scope of reliability and maintenance data for the wind industry (based on accepted reliability data best practice in oil and gas industry), while minimizing the time and cost associated with the development of the standard.
- As a longer term recommendation, there is a need to develop standard definitions for damage classification and severity for structural integrity issues.
- Basis for sound reliability analyses and maintenance optimisation