Power Performance Measurements: Cheaper Faster Better

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Dan BernadettChief Engineer, AWS TruepowerPower Performance MeasurementsCheaper, Faster, Better!

#WindWebinarThis webinar will be available afterwards at www.windpowerengineering.com & email

Q&A at the end of the presentation

Hashtag for this webinar: #WindWebinar

Before We Start

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Introducing the Featured SpeakersMODERATORFEATURED SPEAKER

Paul DvorakEditorial DirectorWindpower Engineering& DevelopmentDan BernadettP.E., Chief EngineerAWS Truepower

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AcknowledgementsThank you to Ellie Weyer of AWS Truepower for collaboration on this presentation.

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125,000Megawatts (MW) Assessed85%of our staff is comprised of engineers, meteorologists and environmental specialists.

Approximately 50% of US wind projects financed in 2015 used AWST Energy Production Reports.43 GWWe provide renewable energy forecasting services to over 43 gigawatts (GW) of capacity.Consulted to about a third of all Brazil wind projects that came online over the last two years

80+Number of Countries Where We Worked 30+Years of ExperienceAssessed resource and energy for over half of all India wind projects over the last two years.

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Background Power Performance Measurements

Measure wind speedMeasure power outputPlot power vs wind speed and compare to warranted curve

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BackgroundMeasure wind speedTerrain and obstacle assessment to determine valid wind direction sectorsAnemometer selection and mounting for highest accuracyTemperature and pressure measurements for air density correctionTurbulence, shear, and inclined flow measurements for TSA filters

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BackgroundMeasure power outputCurrent transducer installation requires turbine transformer to be de-energizedNeed to measure low voltage. If turbine transformer is uptower, that means power measurements are performed uptowerNeed to synchronize clocks of power and wind speed measurements

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BackgroundPlot power vs wind speed and compare to warranted curve

Data filteringCurtailments for grid or environmental issuesWarranty may be a function of uncertainty

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OverviewPower performance measurements (PPM) are crucial to ensuring turbine and plant performance meet expectationsHowever, the current standard requires hub height met towers, which makes measurements time consuming and expensive

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SummaryOld standardNew standardWhat this change means for you

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The OpportunityDraft standard allows met towers to be as short as the bottom sweep of the rotorFor a 100m rotor on an 80m tower, bottom sweep of the rotor is 30m

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The Opportunity

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Application ConsiderationsMeasurement Configuration Shear NormalizationVeerAdded UncertaintyTurbulence Inclined FlowHub height mastNoNoYesOptionalHub Height Mast + RSD*Yes Yes NoOptionalRSD + non-hub height mastYes Yes No OptionalMet mast above hub heightYes Yes NoOptional

* RSD = Remote Sensing Device

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Application LimitationsWind Speed Measurement/ Terrain TypeHH/SimpleHH/ComplexREWS/SimpleREWS/ComplexHub height mastHub Height Mast + RSDRSD + non-hub height mastMet mast above hub height

* RSD = Remote Sensing Device

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Old StandardHub height met towersExpensiveLengthy permittingLengthy procurementCustom tower made to spec with 6-10 WEEK lead timeLengthy construction (excavation and concrete cure time)

Source: AWS Truepower, LLC

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New Standard - AdvantagesLower blade sweep met tower height used in conjunction with remote sensing like LIDAR or SODARCheaper ($)Shorter permittingFaster procurementOff-the-shelf tower with 6-10 DAY lead timeFaster construction (NO excavation and NO concrete)

Source: AWS Truepower, LLC

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Cost Comparison: New VS Old StandardPrices include:Foundation materials, labor, mobilizationTower materials, labor, mobilizationBooms and hardware materials and laborFAA light and power supplyH-frame, equipment rental, cranes, paint

Source: AWS Truepower, LLC

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Cost Comparison: New VS Old Standard

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Cost Comparison: New VS Old Standard

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Schedule ComparisonSelf-supporting met towerTilt-up met towerWeek123456789101112Met Tower Procurement and InstallationOrder TowersXTower ManufactureXXXXXXXXFoundation Installation and CuringXXXXXXTower shippingXTower Installations (Including Booms)XX

Week123456789101112Met Tower Procurement and InstallationOrder TowersXTower Manufacture !!!Foundation Installation and Curing !!!Tower ShippingXTower Installations (Including Booms)XX

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What About Accuracy?The remote sensing annex in the new standard contains extensive validation procedures to ensure that remote sensing is as accurate as cup anemometry, and that remaining uncertainty is quantified and included in the process.

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New Standard DisadvantagesHigher uncertainty

New sources of uncertainty addedi.e. if you dont normalize for shear, uncertainty is added

More complicated definition of wind speed can change!If use REWS (Rotor Equivalent Wind Speed) to normalize shear, need REWS power curve and REWS wind characterization

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Preparing for the New StandardRemote sensing in parallel with PPMTI correctionREWS (Rotor Equivalent Wind Speed)VeerInclined flow

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ConclusionsFaster & Cheaper(with same uncertainty)Better=(if managed properly)Higher Uncertainty & More ComplicatedWorse=(if not managed properly)

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Questions?MODERATORFEATURED SPEAKER

Paul DvorakEditorial DirectorWindpower Engineering& Developmentpdvorak@wtwhmedia.comDan BernadettP.E., Chief EngineerAWS Truepowerdbernadett@awstruepower.com

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This webinar will be available at www.windpowerengineering.com & emailTweet with hashtag #WindWebinarConnect with Windpower Engineering & Development

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Dont Forget!

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#WindWebinarSheet1

Tower TypeHeight (m)CostSelf-supporting tower80$160,000Guyed lattice tower 80$100,000Tilt-up tubular tower 80$75,000Tilt-up tubular tower 60$40,000Tilt-up tubular tower 50$35,000Tilt-up tubular tower34$25,000Three month lidar rentaln/a$30,000Lidar shipping & commissioningn/a$10,000

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