Dipl.-Ing (FH) Sanna Luikenga (Project Engineer, Energy Hamburg)
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ASSESSMENT OF THE WIND CONDITIONS AND TUBULENCE INTENSITY OF THE PROPOSED SITE SÜDERLÜGUM (SCHLESWIG-HOLSTEIN) - ACCORDING TO FGW TR 6 - Bürgerwindpark Süderlügum GmbH & Client Co.KG Adress Dorfstraße 11, 25923 Ellhöft Document No. GLGH-4275 13 10919 271-A-0002-A Site Süderlügum Order No 4275 13 10919 271 Contact Mr. Reinhard Christiansen Status Final Order date 2013-11-27 GL Garrad Hassan Deutschland GmbH Supplier Brooktorkai 18 20457 Hamburg, Germany Author: Dipl.-Ing (FH) Sanna Luikenga (Project Engineer, Energy Hamburg) Approved by: Dipl.-Ing. (FH) Christoph Böge (Head of Department Energy Hamburg) Hamburg, 2013-12-13 ____________________________ _____________________________ Dipl.-Ing. (FH) Christoph Böge Dipl.-Ing. (FH) Sanna Luikenga GL Garrad Hassan Deutschland GmbH Document No.: GLGH-4275 13 10919 Assessment of the wind conditions and tubulence Final 271-A-0002-A intensity of the proposed site Süderlügum (Schleswig- Holstein)- According to FGW TR 6 - IMPORTANT NOTICE AND DISCLAIMER 1. The report ("Report") is prepared and issued by GL Garrad Hassan Deutschland GmbH ("GH-D") for the sole use of the client as detailed on the front page of this document to whom the document is addressed and who has entered into a written agreement with the GL Garrad Hassan entity issuing this document (“GL GH”). 2. This report has been produced from information relating to dates and periods referred to in this report. The report does not imply that any information is not subject to change. 3. This report is protected by copyright and may only be reproduced with written consent of GL Garrad Hassan. It totally consists of 38 pages incl. all annexes. © 2013 GL Garrad Hassan Deutschland GmbH GL Garrad Hassan Deutschland GmbH Document No.: GLGH-4275 13 10919 Assessment of the wind conditions and tubulence Final 271-A-0002-A intensity of the proposed site Süderlügum (Schleswig- Holstein)- According to FGW TR 6 - TABLE OF CONTENTS COVER SHEET IMPORTANT NOTE List OF TABLES LIST OF FIGURES 1 INTRODUCTION 3 2 DETERMINATION OF WIND CONDITIONS 4 2.1 Description of European wind atlas method 4 2.2 Description of the site Süderlügum 6 2.3 Assessment of wind conditions 6 2.4 Calculation results 7 3 VALIDATION OF THE RESULTS 8 4 UNCERTAINTY ANALYSIS 11 4.1 Standard uncertainty 11 4.2 Probabilities of exceeding 12 5 TURBULENCE INTENSITY 13 5.1 Primary note 13 5.2 Assessment of the ambient turbulences at the site Süderlügum 13 5.3 Calculation of the effective turbulence at the site Süderlügum 15 6 DEVIATIONS TO TR 6 16 7 DEVIATIONS TO GH-D QUALITY MANAGEMENT - MANUAL 16 8 CONCLUSION 17 9 LITERATURE 18 APPENDIX 1 OVERVIEW OF MAPS 19 APPENDIX 2 ANALYSIS OF WIND CONDITIONS 25 APPENDIX 3 POWER CURVES 29 GL Garrad Hassan Deutschland GmbH Seite 1 von 39 Document No.: GLGH-4275 13 10919 Assessment of the wind conditions and tubulence Final 271-A-0002-A intensity of the proposed site Süderlügum (Schleswig- Holstein)- According to FGW TR 6 - APPENDIX 4 COMPARAITVE TURBINES 33 APPENDIX 5 UNCERTAINTY ANALYSIS & EXCEEDING PROBABILITY 39 LIST OF TABLES Table 1.1: Revision history 3 Table 1.2: Details of proposed wind farm project Süderlügum 4 Table 2.1: Wind conditions at the site Süderlügum 7 Table 3.1: Comparative turbines for the site Süderlügum 10 Table 5.1: Results of the turbulence assessment Süderlügum 14 Table 5.2: Effective turbulence intensity, I15,eff 16 LIST OF FIGURES Figure 2.1: Schema of wind atlas method [4] 6 Figure 3.1 Comparing BDB Index and MERRA Index 9 GL Garrad Hassan Deutschland GmbH Seite 2 von 39 Bericht Nr.: GLGH-4275 13 10919 Assessment of the wind conditions and tubulence intensity Final 271-A-0002-A of the proposed site Süderlügum (Schleswig-Holstein) - Gemäß FGW TR 6 - 1 INTRODUCTION Subject of this report is the assessment of the site Süderlügum in Schleswig-Holstein concerning the local wind conditions. In addition, the natural and characteristic ambient turbulence are determined and the effective turbulence of the individual wind turbines is calculated. The calculation of the effective turbulence is not part of the accreditation of GH-D. Bürgerwindpark Süderlügum GmbH & Co.KG has instructed Garrad Hassan Deutschland GmbH (GH-D) on the 2013-07-23 to carry out an assessment of the wind conditions and turbulence intensity according to the technical guideline for wind turbines part 6, revision 8 published by the FGW (Fördergesellschaft Wind) on the 2011-05-19 [1]. The GH-D is an accredited testing laboratory. Issue Issue date Summary GLGH-4275 12 2012-09-11 Assessment of wind conditions and energy yield 09152 271-A- 0001-A GLGH-4275 12 2012-11-12 Determination of the natural turbulence intensity and 09912 271-A- assessment of extreme wind speed 0001-A GLGH-4275 12 2013-05-02 Changes of coordinates, noise and shadow losses and wind 09152 271-A- conditions of the planned wind turbine were taken from the 0005-A previous report 1. Nachtrag GLGH-4275 12 2013-07-30 Determination of ambient turbulence and effective 10919 271-A- turbulence (Report language: German) 0001-A GLGH-4275 13 2013-12-13 Determination of ambient turbulence and effective 10919 271-A- turbulence (Report Language: English) 0002-A Table 1.1: Revision history Details of the proposed wind farm project Süderlügum are shown in Table 1.2. GL Garrad Hassan Deutschland GmbH Seite 3 von 39 Bericht Nr.: GLGH-4275 13 10919 Assessment of the wind conditions and tubulence intensity Final 271-A-0002-A of the proposed site Süderlügum (Schleswig-Holstein) - Gemäß FGW TR 6 - Hub Height Layout Manufacturer and turbine type No. of turbines [m] Siemens SWT 3.0-113 11 92.5 1 Siemens SWT 3.0-101 1 79,5 Table 1.2: Details of proposed wind farm project Süderlügum The proposed project scenarios currently under consideration have been supplied by the client. The site is located approximately 2 km north of the village Süderlügum. 2 out of 13 proposed turbines are located approximately 1.5 km northwest of Süderlügum in the area of Nordfriesland. The site layout showing the turbine locations is presented in Appendix 1. The coordinates of the individual turbines are given in Appendix 1 using Gauss Krueger Bessel Zone 3 referring to Potsdam date as a Coordinate System. 86 currently planned or existing turbines of different types and hub heights in a surrounding area of up to 10 km were considered for the calculation concerning the wake effect. Details are given in Appendix 1. 2 DETERMINATION OF WIND CONDITIONS 2.1 Description of European wind atlas method Determination of wind conditions at the site is carried out according the European wind atlas method utilizing the software WindPRO 2.7 [2] and the Wind Atlas Analysis and Application Program (WAsP), Version 10.0 [3]. The program is based on a mathematic model, which takes site-specific conditions in terms of orography, roughness and obstacles into account, while determining the wind conditions at a site. Based on regional frequency distributions of wind speed and characteristics of the ground boundary layer in the region of interest, mean wind speeds for certain heights above ground are calculated [4]. GL Garrad Hassan Deutschland GmbH Seite 4 von 39 Bericht Nr.: GLGH-4275 13 10919 Assessment of the wind conditions and tubulence intensity Final 271-A-0002-A of the proposed site Süderlügum (Schleswig-Holstein) - Gemäß FGW TR 6 - Figure 2.1 shows the schematic method. Prerequisite for the calculation is the availability of measured long-term wind conditions at a meteorological station in the same region. The measured wind conditions are pre- processed, eliminating the impact of local site terrain conditions at the meteorological station from the measured data, terminating in a “generalised regional wind climatology”. Such a regional wind statistic contains information concerning the frequency and direction distribution for all direction sectors for regional wind conditions that are no longer influenced by site-specific terrain conditions. In the next step the “generalised regional wind climatology” data set is applied to the proposed site, taking site specific conditions into account. In this way the site-specific wind conditions are determined. The result is represented at the heights of 50.0 m and the hub heights of the proposed wind turbines above ground level (AGL) (Appendix 2). It includes the mean annual wind speed and the Weibull- distribution parameters A (scaling parameter) and k (form parameter). Additionally, the expected wind frequency distribution using 30°-sectors as well as the particular mean wind speed and the belonging Weibull-parameters A and k are represented. Based on these estimated site-specific wind conditions and turbine specific power curve, the total energy yield of the proposed wind farm is calculated taking internal and external wake losses into account. GL Garrad Hassan Deutschland GmbH Seite 5 von 39 Bericht Nr.: GLGH-4275 13 10919 Assessment of the wind conditions and tubulence intensity Final 271-A-0002-A of the proposed site Süderlügum (Schleswig-Holstein) - Gemäß FGW TR 6 - Figure 2.1: Schema of wind atlas method [4] 2.2 Description of the site Süderlügum The site Süderlügum was visited by an employee of GH-D (Dipl.-Ing. Jörg Dedert) on the 2012-04-25. Pictures were taken from at least one representative point within the proposed area, covering the entire wind rose. Additionally, a rough mapping of the surrounding area regarding land use, vegetation heights, existing obstacles etc. has been carried out. Based on local information and topographical maps (1:25.000 and 1:100.000) the site Süderlügum can be described as follows. The proposed site is located at a height of about 2-5m above sea level (see map in Appendix 1).