WP3 - Energy yield estimation of wind farm clusters DANIEL CABEZÓN CFD Wind Engineer CENER (National Renewable Energy Center of Spain) Support by.

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Presentation transcript:

WP3 - Energy yield estimation of wind farm clusters DANIEL CABEZÓN CFD Wind Engineer CENER (National Renewable Energy Center of Spain) Support by

Overview 1.Introduction 2.Net AEP of wind farm clusters (WP3.1) 3.Uncertainty analysis (WP3.2) 4.Work plan

Objective: Provide an accurate value of the expected net energy yield from the cluster of wind farms as well as the uncertainty ranges Period: [M1-M18] Deliverables: Report on procedure for the estimation of the expected net AEP and the associated uncertainty ranges [M18] 1. Introduction

WF 3 WF 1 WF 2 L wakes [V,θ] = Wake losses (WP1) L el_WF = Electrical losses (WP2) L OM = Operation and Mantainance (WP 3.1.2) L PC = Power curve deviations (WP 3.1.3) AEP gross (WP 3.1.1) AEP net WF = AEP gross * L wakes [V,θ]* L el_WF * L OM * L PC AEP net cluster = L el_intraWF *Σ AEP net WFi - Uncertainty analysis (WP3.2)

1. Introduction WP 3.1 – Net energy yield of wind farm clustersCENER, CRES, ForWind, Strathclyde University, CIEMAT, Statoil, RES WP – Gross energy yield WP – Losses due to Operations and Mantainance WP – Losses due to deviations between onsite and manufacturer power curve WP 3.2 – Uncertainty analysis of net energy yieldCIEMAT, Strath, CRES, CENER, DTU-Wind Energy, Uporto, ForWind, RES

WP 3.1.1: Gross energy yield Starting point for the final energy yield Wind data (Observational / numerical) Long term (LT) analysis: Significance of the measuring period Alternative use of reanalysis data Vertical extrapolation: In case no available data at hub height Data from several heights 2. Net AEP of wind farm clusters (WP3.1) AEP gross WF = F (Wind Data, Power Curve, filtering, LT_analysis, shear_exponent)

WP Losses due to Operations & Maintenance (OM) Critical parameters affecting OM: Vulnerability of design Weather conditions (average wave height) Wind turbine degradation Maintenance and access infrastructure Site predictability Two options depending on data accessibility: Direct modeling (expert judgment tools) Table of losses based on experience (site classification) 2. Net AEP of wind farm clusters (WP3.1) WF layout Wind data series (WS, wave height…) WT specifications Type of maintenance infraestructure Modeling / Site classification OM losses + uncertainty

WP 3.1.3: Deviations between onsite and manufacturer power curve (PC) Critical parameters affecting PC deviations: Salinity + Corrosion (WP 1.4) Turbulence intensity Two options depending on data accessibility: Direct modeling (stochastic tools) Table of losses based on experience (site classification) 2. Net AEP of wind farm clusters (WP3.1) Turbulence intensity Corrosion Salinity Modeling / Site classification PC losses + uncertainty

Standardize with industry the uncertainty analysis methodology to avoid ambiguity Existing related procedures: IEC Standard on Power Curve measurement IEA Recommended practices on Wind Speed Measurement MEASNET guidelines for wind resource assessment Identify Long-Term uncertainty components Expected output for each wind farm and cluster: Long Term AEP uncertainty AEP uncertainty in future periods [1 year, 10 years] Gaussian approach mostly extended 3. Uncertainty analysis (WP3.2)

Associated to wind speed estimation: 3. Uncertainty analysis (WP3.2) S AEP = Sensitivity of gross AEP to wind speed [GWh/ms-1] ConceptUcompU[m/s]U WS [GWh] Measurement process / NWP U meas /U NWP U WS0 U WS = S AEP *U WS0 Long term correlationU LT Variability of the periodU var Vertical extrapolationU ver

Associated to modeling ‘Historic’ AEP uncertainty: U 2 LT_WF = U 2 WS + U 2 modeling AEP Uncertainty in ‘future’ periods of N years: U 2 Ny_WF P50, P75, P90 3. Uncertainty analysis (WP3.2) ConceptU comp U modeling [GWh] WakesU wakes U modeling ElectricalU elect Operation and MaintenanceU OM Power curve degradationU PC U 2 Ny_WF = U 2 LT_WF + AEP net *0.061*(1/ √N) HISTORICFUTURE

4. Work plan M0 M6M12M18 WP 3 – Energy yield of wind farm clusters Run cases and validation Direct modeling / experimental table Review processes / models Protocol interface - inputs/outputs Identify study cases Data access (Conf. issues)

Thank you very much for your attention