Wind Data Analysis 40m

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ContentsTable of ContentsTab Title (w/ link to sheet)Worksheet Description/FunctionTitleCredits and DisclaimerInstructionsInformation on maintenance and use of the analysis model.AnalysisData input tab, with all calculations for data analysis. User inputs site,logger, and analysis requirements. All calculations and output data for charts are displayed on this tab.Summary ReportPrintable sheet provides a summary of analysis. Includes wind rose, diurnal,power curve, and frequency distribution graphs.Wind TurbinesTables that list wind turbine models and power output ratings by manufacturer.Power CurvesList of calculated power curves from manufacturer's data, or a user-defined curve.Monthly Wind Variation GraphGraph showing the windspeed pattern for a single month, as chosen by the user.Data TablesInput tables that defines lists used in the model, such as data logger types, tower heights,and timestamp increments.

InstructionsWind TurbinesPower CurvesAnalysisSummary ReportTitleMonthly Wind Variation GraphData Tables

TitleExcel Wind Data Analysis, v2Back to ContentsPrepared by: Matthew West - Idaho National Engineering and Environmental Laboratory, 2003, 2004; Idaho National Laboratory, 2005, 2006 - Spring/Summer Fellowship ProgramsWith help from: Gary Seifert, Kurt Myers--INLThis spreadsheet is provided by the INL strictly as an educational tool, free to use by the general public, to promote and further the understanding and development of wind energy. The program may be downloaded for personal or professional use as necessary. Any misuse of the software is not the responsibility of the INL.Power curves provided were obtained directly from the manufacturers. Data is subject to change; please contact the turbine manufacturers for more information.For questions, contact:Gary SeifertKurt Myers(208) 526-9522(208) [email protected]@inl.govWebsite:www.inl.gov/wind/

www.inl.gov/wind/Back to Contents

InstructionsThis sheet contains instructions for model usage, as well as for modifying/adding additional information (power curves, etc.)Back to ContentsAssumptions1. This model will only handle wind speed, standard deviation, and wind direction data from one instrument position at a time (some data loggers can collect data from multiple wind vanes and anemometers on the same data tower simultaneously).Model Usage InstructionsNOTES:1. To reduce model calculation time, set the worksheet to manual calculation. To do this, push the button at right,or select Tools>>Options, and then pick Manual from the Calculation tab shown.2. Comments have been placed in certain cells within the spreadsheet to provide tips and helpful information. To view, simply place the mouse arrow over one of the cells with the red flag in the corner.3. Wind Rose Graph Data displayed on Analysis tab can be cleared by pushing the button to the right of the table. This button is available to reduce file size when saving.4. Information from Analysis tab is summarized and displayed on the Summary Report tab. This worksheet has been pre-formatted for printing.5. If worksheets do not look right, adjust the zoom by selecting View>>Zoom>>[x]% from the main toolbar.6. Cells are color-coded by function as follows:= Labels= User Input Required= Calculations, No User InputData InputGetting Started1. Select File>>Save As from the toolbar at the top of the screen. Enter a desired name (for instruction purposes, I will call it My_Excel, but site name or number and date is suggested to create a unique file), and save in a location where it can be easily retrieved.2. Click on Analysis worksheet, if not already there.Obtaining Sample Data File1. Data collected by the INL can be viewed by visiting the INL-Wind Powering America Support website at http://www.inl.gov/wind/idaho/. Scroll down to the map of Idaho and click on a desired site, displayed as dots on the map.2. You will be directed to a brief site summary. Scroll down until you see a link that says comma delimited files, and click on this link.3. To download one of the data files: Click on one of the filenames, and a window should appear asking to open the file or save it to your computer. If it does not, Right-click on the filename and select Save Target As. Click the drop-down arrow next to the Save In: label and select Desktop. Click Save to save the file to the desktop. Return to Microsoft Excel, and click on File>>Open or on the Open button on the toolbar. Browse to the desktop, and if the filename is not listed, select the drop-down arrow next to the Files of type: label and select All Files (*.*). Select the filename and click Open. Select Delimited and click Next, then check the box next to Comma and click Finish. The file should now be opened correctly in Excel.4. Return to My_Excel file.Entering Wind Data1. Push button labeled "Clear Data" at the top of the Analysis tab, clearing logger data. If running program for the first time, data will not be present for clearing.2. Open data file (.n## or .xls format) and select the first row of data under Speed, Standard Deviation, and Direction headings.3. Select data using one of the following: Scroll page to the bottom of the data, hold down Shift key, and select the last entry in Direction column, or Hold Ctrl, Shift, and Down arrow on keyboard.4. Copy data using one of the following: Right-click mouse, select Copy, or Select Edit>>Copy under toolbar at top of screen, or Hold Ctrl+C on keyboard.5. Return to My_Excel file, Analysis worksheet, and select Cell B13 (or first cell under appropriate header column).6. Paste data using one of the following: Right-click mouse, select Paste, or Select Edit>>Paste under toolbar at top of screen, or Hold Ctrl+V on keyboard. Data should now be displayed in columns B-D.Entering Site Information and Analysis Preferences1. On Analysis tab, enter site information into cells B1 through B8 as follows: Cell B1-B3: Provide a site number for the site (useful if data is collected from multiple locations), site name, and brief site description. This information is not required for data analysis, but allows for a uniquely identifiable file, and will be reported on the summary report. Cell B4: Enter site elevation. This value is used to calculate air density. Cell B5: Pick appropriate data tower height from the list (drop-down selection arrow appears when cell is selected). If tower height is not listed, refer to the Modification Instructions - Data Tables Tab procedure on this sheet. Cell B6: Enter offset direction for the wind vane, required if wind vane is positioned in a direction other than true north. Cell B7-B8: Press the button labeled "Insert Start and Stop Times" to insert the first and last timestamps for the data. These numbers will allow the time stamps to be inserted correctly into column A. (This can also be done manually, but must maintain the correct format).2. Choose data analysis preferences in cells E1 through E7 as follows: Cell E1: Select box to include all data points with "0 mph" average wind speed into calculations, or if patching is used to replace such points. Otherwise, all calculations will exclude these points. Cell E2: Select the data logger used for collection from the list. If logger is not available, refer to Modification Instructions - Data Tables Tab. Cell E3: Select the month to display the wind variation (all data points) on the Monthly Wind Variation Graph tab. Data must include at least one data point from the selected month, or an error will occur. Cells E4-E5: Select wind turbine manufacturer and model from the lists. The selected model will be used to estimate power output and capacity factor. If manufacturer/model is not available, or if you wish specify a User Input model, to refer to Modification Instructions - Wind Turbines Tab and Power Curves Tab procedures. Cell E6: Enter the estimated wind shear value for the site (if known). If unknown, leave the default value (1/7) in this cell. Cell E7: Select the time stamp increment value from the list. If this value is not listed, refer toModification Instructions - Data Tables.3. Enter a desired scale height (optional) into cell J24. Estimated power output and capacity factor will be calculated at this height in addition to the actual height.Running Calculations1. Click on button labeled "Insert Time Stamps." This will place values beginning with the entered start time through the stop time, at equal intervals as determined by the selected time stamp increment.2. Click on button labeled "Calculate Cells." This may take several seconds to finish, depending on your computer's processing speed, and the amount of data being analyzed.Patching DataIn some cases, wind data files may contain bad data, that is, data with "0 mph" average wind speeds. This may occur when an anemometer becomes iced during the winter, for instance. It may be desired to perform analysis without taking this data into account. Use the following to patch:1. An Auto-filter has been place on the Analysis tab (Row 12) with the purpose of filtering all data with "0 mph" average wind speed for patching purposes. To use, click on the arrow on the lower right hand corner of the Average Speed column header cell. Select the desired value, and only cells containing this value will appear in the column.2. Simply replace the "0 mph" data with an alternate value as desired.3. When the "Calculate Cells" button is pushed, rows with "0 mph" data will be highlighted pink so that they can be easily located. Also, these values will be plotted on a red line on the Monthly Wind Variation Graph, so that the user can easily tell where large sections of "bad data" may appear.4. As mentioned previously, to simply exclude "bad data" in calculations, un-check the box in cell E1.Modification InstructionsNOTES:1. Modification of the model and/or additional