IEC 61400-15 WG UpdateAssessment of Wind Resource, Energy Yield,and Site Suitability Input Conditions forWind Power PlantsJason Fields, SecretaryNREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.
IEC 61400-15 CD Expected to be issued late 2018/early 2019 Intended to compliment other IEC standards– 61400-1 (Design)– 61400-12 (Power Performance Testing)– 61400-50 (Measurement standards) Committee has 55 members (2nd largest wind standard) Next Meeting: Tokyo, Japan April 2018 Broad Engagement OEM’sOwner/OperatorsConsultanciesResearch Institutes2
Goals – Normative (Required) Define standards for reporting– A checklist of items that must be considered in an assessment– Report must cover the checklist and explain how each item wasconsidered– Example: Wind speed predictions at turbine locations Define IEC uncertainty model– Explicit calculation of uncertainty– Provides benchmark for readers– Organizations can still use their own uncertainty calculation but wouldneed to also report the IEC calculation and explain differences– Used as a tool to show what activities can reduce uncertainty Met towers/ Remote Sensing High quality anemometers Define turbine suitability load calculation inputs– Each manufacturer asks for different datasets to run their loads model– Standardize the data to improve quality and transparency3
Goals – informative (Recommended) Provide industry consensus bestpractices, including multipleapproaches to common problems– Measurement (Local Site Conditions) Measurement strategy Measurement parameters Measurement Devices– Meteorological Towers andInstrumentation– Remote Sensing Data Management Production data fromnearby projects Alternative validmeasurements– Data Analysis Traceability and Calibration Quality control of data– Wind Resource Modeling Gap FillingLong-TermVertical ExtrapolationHorizontal ExtrapolationValidation (all of the above)– Wind Plant Energy Yield Modeling Ideal Energy Yield Wake Losses– Statistical description ofmeasurements Frequency Distributions Wind Roses 87604
Current statusLoss andUncertaintyfactor reportingtables ready forexternal review.Site SuitabilityInput Formbeing umentcomponentsbeingaggregatednow for CDDocument available that outlines all this in detail – contact your local mirror committee, orme ([email protected]), for a copy55
Formal update document88
Collaboration IdeasCFARS: Define best practice Test existing & newmethods99
Foundational WorkExisting related standards &best practices IEC 61400-1,3 WindTurbine: DesignRequirements IEC 61400-12-1 PowerPerformance Testing IEC 61400-26 Availability:Technical Specification IEC 61400-50Measurement standards MEASNET “Evaluation ofsite specific winds”Other documents/collaborations Consortium Loss &Uncertainty definitions Wind Resource Assessment: APractical Guide to Developinga Wind Project IEA Wind Task 32 RemoteSensing IEA Wind Task 31 Windbenchand Wakebench IEA Task 11 75th meeting oncomplex terrain Power Curve Working Group11
Scope of Standard - ApprovedThe scope of this standard is to define a framework for assessment and reporting of the wind resource, energyyield and site suitability input conditions for both onshore and offshore wind power plants. This includes: 1. Definition, measurement, and prediction of the long-term meteorological and wind flow characteristics atthe site 2. Integration of the long-term meteorological and wind flow characteristics with wind turbine and balance ofplant characteristics to predict net energy yield 3. Characterizing environmental extremes and other relevant plant design drivers 4. Assessing the uncertainty associated with each of these steps 5. Addressing documentation and reporting requirements to help ensure the traceability of the assessmentprocessesThe framework will be defined such that applicable national norms are considered and industry best practices areutilized.The meteorological and wind flow characteristics addressed in this document relate to wind conditions, whereparameters such as wind speed, wind direction, air density or air temperature are included to the extent that theyaffect the operation and structural integrity of a wind turbine (WTGS) and energy production analysis.According to IEC 61400-1 and 61400-3 the site specific conditions can be broken down into wind conditions, otherenvironmental conditions, soil conditions, ocean/lake conditions and electrical conditions. All of these siteconditions other than site specific wind conditions and related documents are out of scope for this standard.This standard is framed to complement and support the scope of related IEC 61400 series standards by definingenvironmental input conditions. It is not intended to supersede the design and suitability requirements presentedin those standards. Specific analytical and modeling procedures as described in IEC 61400-1, 61400-2, and 61400-3are excluded from this scope.112
Scope of standard, Pt 2 (for document)The basic and fundamental goal is to present consensus methodologies on site assessment andto create a set of standard reporting requirements which detail the measurement campaign,analysis processes, and considerations taken by the author of a wind resource characterizationand energy yield assessment. The methodologies presented provide a framework to ensure ahigh quality set of project data are collected and analyzed to support wind resource and sitecharacterization. The standardized reporting process will provide a discrete list of criteriawhich must be considered and reported on for all projects. These reporting procedures willprovide transparency to report readers about the considerations taken during the analysis, andconfidence that the analysis considered all of the key criteria and procedures identified by IEC61400-15 for wind resource assessment.At a minimum, the document will prescribe standard reporting elements and considerationsduring the analysis process, and recommend practices to reduce uncertainty for all elements ofthe assessment and campaign.Two additional goals of the standard which should be explored by the committee: Develop a standard uncertainty calculation to be used for benchmarking Provide standardized inputs for turbine loads calculationsThe document will not: Qualify or disqualify projects Qualify or disqualify consultants/Independent Engineers113
According to IEC 61400- 1 and 61400-3 the site specific conditions can be broken down into wind conditions, other environmental conditions, soil conditions, ocean/lake conditions and electrical conditions. All of these site conditions other than site specific wind conditions and related documents are out of scope for this standard.